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-rw-r--r--html/001help.cc.html101
-rw-r--r--html/002test.cc.html35
-rw-r--r--html/003trace.cc.html127
-rw-r--r--html/003trace.test.cc.html2
-rw-r--r--html/010vm.cc.html219
-rw-r--r--html/011load.cc.html201
-rw-r--r--html/012transform.cc.html118
-rw-r--r--html/013update_operation.cc.html23
-rw-r--r--html/014literal_string.cc.html103
-rw-r--r--html/015literal_noninteger.cc.html15
-rw-r--r--html/016dilated_reagent.cc.html123
-rw-r--r--html/017parse_tree.cc.html65
-rw-r--r--html/018type_abbreviations.cc.html73
-rw-r--r--html/020run.cc.html179
-rw-r--r--html/021check_instruction.cc.html89
-rw-r--r--html/022arithmetic.cc.html269
-rw-r--r--html/023boolean.cc.html67
-rw-r--r--html/024jump.cc.html53
-rw-r--r--html/025compare.cc.html207
-rw-r--r--html/026call.cc.html39
-rw-r--r--html/027call_ingredient.cc.html115
-rw-r--r--html/028call_return.cc.html115
-rw-r--r--html/029tools.cc.html93
-rw-r--r--html/030container.cc.html293
-rw-r--r--html/031merge.cc.html175
-rw-r--r--html/032array.cc.html155
-rw-r--r--html/033exclusive_container.cc.html109
-rw-r--r--html/034address.cc.html95
-rw-r--r--html/035lookup.cc.html71
-rw-r--r--html/036refcount.cc.html279
-rw-r--r--html/037abandon.cc.html51
-rw-r--r--html/038new_text.cc.html67
-rw-r--r--html/039location_array.cc.html9
-rw-r--r--html/040brace.cc.html305
-rw-r--r--html/041jump_target.cc.html119
-rw-r--r--html/042name.cc.html161
-rw-r--r--html/043space.cc.html73
-rw-r--r--html/044space_surround.cc.html21
-rw-r--r--html/045closure_name.cc.html103
-rw-r--r--html/046global.cc.html19
-rw-r--r--html/047check_type_by_name.cc.html61
-rw-r--r--html/050scenario.cc.html443
-rw-r--r--html/051scenario_test.mu.html43
-rw-r--r--html/052tangle.cc.html137
-rw-r--r--html/053recipe_header.cc.html253
-rw-r--r--html/054static_dispatch.cc.html285
-rw-r--r--html/055shape_shifting_container.cc.html241
-rw-r--r--html/056shape_shifting_recipe.cc.html371
-rw-r--r--html/057immutable.cc.html183
-rw-r--r--html/058to_text.cc.html7
-rw-r--r--html/059to_text.mu.html7
-rw-r--r--html/060rewrite_literal_string.cc.html53
-rw-r--r--html/061text.mu.html929
-rw-r--r--html/062convert_ingredients_to_text.cc.html89
-rw-r--r--html/063array.mu.html145
-rw-r--r--html/064list.mu.html257
-rw-r--r--html/065duplex_list.mu.html525
-rw-r--r--html/066stream.mu.html19
-rw-r--r--html/068random.mu.html53
-rw-r--r--html/069hash.cc.html75
-rw-r--r--html/070table.mu.html29
-rw-r--r--html/071recipe.cc.html135
-rw-r--r--html/072scheduler.cc.html185
-rw-r--r--html/073wait.cc.html167
-rw-r--r--html/074deep_copy.cc.html59
-rw-r--r--html/075channel.mu.html375
-rw-r--r--html/080display.cc.html213
-rw-r--r--html/081print.mu.html553
-rw-r--r--html/082scenario_screen.cc.html279
-rw-r--r--html/083scenario_screen_test.mu.html19
-rw-r--r--html/084console.mu.html57
-rw-r--r--html/085scenario_console.cc.html227
-rw-r--r--html/086scenario_console_test.mu.html29
-rw-r--r--html/087file.cc.html127
-rw-r--r--html/088file.mu.html139
-rw-r--r--html/089scenario_filesystem.cc.html223
-rw-r--r--html/090scenario_filesystem_test.mu.html45
-rw-r--r--html/091socket.cc.html203
-rw-r--r--html/092socket.mu.html97
-rw-r--r--html/099hardware_checks.cc.html129
-rw-r--r--html/100trace_browser.cc.html317
-rw-r--r--html/101run_sandboxed.cc.html169
-rw-r--r--html/channel.mu.html33
-rw-r--r--html/chessboard.mu.html515
-rw-r--r--html/console.mu.html13
-rw-r--r--html/counters.mu.html2
-rw-r--r--html/display.mu.html2
-rw-r--r--html/edit/001-editor.mu.html397
-rw-r--r--html/edit/002-typing.mu.html909
-rw-r--r--html/edit/003-shortcuts.mu.html2499
-rw-r--r--html/edit/004-programming-environment.mu.html639
-rw-r--r--html/edit/005-sandbox.mu.html1141
-rw-r--r--html/edit/006-sandbox-copy.mu.html217
-rw-r--r--html/edit/007-sandbox-delete.mu.html335
-rw-r--r--html/edit/008-sandbox-edit.mu.html279
-rw-r--r--html/edit/009-sandbox-test.mu.html219
-rw-r--r--html/edit/010-sandbox-trace.mu.html247
-rw-r--r--html/edit/011-errors.mu.html757
-rw-r--r--html/edit/012-editor-undo.mu.html1633
-rw-r--r--html/example1.mu.html2
-rw-r--r--html/factorial.mu.html21
-rw-r--r--html/filesystem.mu.html15
-rw-r--r--html/fork.mu.html15
-rw-r--r--html/global.mu.html2
-rw-r--r--html/http-client.mu.html17
-rw-r--r--html/http-server.mu.html4
-rw-r--r--html/immutable-error.mu.html2
-rw-r--r--html/lambda-to-mu.mu.html343
-rw-r--r--html/mutable.mu.html2
-rw-r--r--html/nqueens.mu.html87
-rw-r--r--html/real-files.mu.html2
-rw-r--r--html/screen.mu.html2
-rw-r--r--html/static-dispatch.mu.html2
-rw-r--r--html/tangle.mu.html7
-rw-r--r--html/x.mu.html2
115 files changed, 11541 insertions, 11309 deletions
diff --git a/html/001help.cc.html b/html/001help.cc.html
index 8cc034f1..287e556f 100644
--- a/html/001help.cc.html
+++ b/html/001help.cc.html
@@ -16,7 +16,7 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .SalientComment { color: #00ffff; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
@@ -25,6 +25,7 @@ a:hover { text-decoration: underline; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .PreProc { color: #800080; }
 .CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -67,40 +68,40 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr">  6 </span>  <span class="Comment">//: this is the functionality later layers will provide</span>
 <span id="L7" class="LineNr">  7 </span>  <span class="Comment">// currently no automated tests for commandline arg parsing</span>
 <span id="L8" class="LineNr">  8 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>argc &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L9" class="LineNr">  9 </span>    cerr &lt;&lt; <span class="Constant">&quot;Please provide a Mu program to run.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L10" class="LineNr"> 10 </span>         &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L9" class="LineNr">  9 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;Please provide a Mu program to run.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L11" class="LineNr"> 11 </span>  <span class="Delimiter">}</span>
 <span id="L12" class="LineNr"> 12 </span>  cerr &lt;&lt; <span class="Constant">&quot;Usage:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L13" class="LineNr"> 13 </span>       &lt;&lt; <span class="Constant">&quot;  mu [options] [test] [files]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L14" class="LineNr"> 14 </span>       &lt;&lt; <span class="Constant">&quot;or:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L15" class="LineNr"> 15 </span>       &lt;&lt; <span class="Constant">&quot;  mu [options] [test] [files] -- [ingredients for function/recipe 'main']</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L16" class="LineNr"> 16 </span>       &lt;&lt; <span class="Constant">&quot;Square brackets surround optional arguments.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L17" class="LineNr"> 17 </span>       &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L18" class="LineNr"> 18 </span>       &lt;&lt; <span class="Constant">&quot;Examples:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L19" class="LineNr"> 19 </span>       &lt;&lt; <span class="Constant">&quot;  To load files and run 'main':</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L20" class="LineNr"> 20 </span>       &lt;&lt; <span class="Constant">&quot;    mu file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L21" class="LineNr"> 21 </span>       &lt;&lt; <span class="Constant">&quot;  To run 'main' and dump a <a href='003trace.cc.html#L161'>trace</a> of all operations at the <a href='003trace.cc.html#L185'>end</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L22" class="LineNr"> 22 </span>       &lt;&lt; <span class="Constant">&quot;    mu --trace file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L23" class="LineNr"> 23 </span>       &lt;&lt; <span class="Constant">&quot;  To run all tests:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L24" class="LineNr"> 24 </span>       &lt;&lt; <span class="Constant">&quot;    mu test</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L25" class="LineNr"> 25 </span>       &lt;&lt; <span class="Constant">&quot;  To load files and then run all tests:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L26" class="LineNr"> 26 </span>       &lt;&lt; <span class="Constant">&quot;    mu test file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L27" class="LineNr"> 27 </span>       &lt;&lt; <span class="Constant">&quot;  To run a single Mu <a href='050scenario.cc.html#L57'>scenario</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L28" class="LineNr"> 28 </span>       &lt;&lt; <span class="Constant">&quot;    mu test file1.mu file2.mu ... <a href='050scenario.cc.html#L57'>scenario</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L29" class="LineNr"> 29 </span>       &lt;&lt; <span class="Constant">&quot;  To run a single Mu <a href='050scenario.cc.html#L57'>scenario</a> and dump a <a href='003trace.cc.html#L161'>trace</a> at the <a href='003trace.cc.html#L185'>end</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L30" class="LineNr"> 30 </span>       &lt;&lt; <span class="Constant">&quot;    mu --trace test file1.mu file2.mu ... <a href='050scenario.cc.html#L57'>scenario</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L31" class="LineNr"> 31 </span>       &lt;&lt; <span class="Constant">&quot;  To load files and run only the tests in explicitly loaded files (for apps):</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L32" class="LineNr"> 32 </span>       &lt;&lt; <span class="Constant">&quot;    mu --test-only-app test file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L33" class="LineNr"> 33 </span>       &lt;&lt; <span class="Constant">&quot;  To load all files with a numeric prefix in a directory:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L34" class="LineNr"> 34 </span>       &lt;&lt; <span class="Constant">&quot;    mu directory1 directory2 ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L35" class="LineNr"> 35 </span>       &lt;&lt; <span class="Constant">&quot;  You can test directories just like files.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L36" class="LineNr"> 36 </span>       &lt;&lt; <span class="Constant">&quot;    mu test directory1 directory2 ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L37" class="LineNr"> 37 </span>       &lt;&lt; <span class="Constant">&quot;  To pass ingredients to a mu program, provide them after '--':</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L38" class="LineNr"> 38 </span>       &lt;&lt; <span class="Constant">&quot;    mu file_or_dir1 file_or_dir2 ... -- ingredient1 ingredient2 ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L39" class="LineNr"> 39 </span>       &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L40" class="LineNr"> 40 </span>       &lt;&lt; <span class="Constant">&quot;  To browse a <a href='003trace.cc.html#L161'>trace</a> generated by a previous run:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L41" class="LineNr"> 41 </span>       &lt;&lt; <span class="Constant">&quot;    mu browse-trace file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L42" class="LineNr"> 42 </span>       <span class="Delimiter">;</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  mu [options] [test] [files]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;or:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  mu [options] [test] [files] -- [ingredients for function/recipe 'main']</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;Square brackets surround optional arguments.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;Examples:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To load files and run 'main':</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To run 'main' and dump a <a href='003trace.cc.html#L161'>trace</a> of all operations at the <a href='003trace.cc.html#L185'>end</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu --trace file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To run all tests:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu test</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To load files and then run all tests:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu test file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To run a single Mu <a href='050scenario.cc.html#L57'>scenario</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu test file1.mu file2.mu ... <a href='050scenario.cc.html#L57'>scenario</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To run a single Mu <a href='050scenario.cc.html#L57'>scenario</a> and dump a <a href='003trace.cc.html#L161'>trace</a> at the <a href='003trace.cc.html#L185'>end</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu --trace test file1.mu file2.mu ... <a href='050scenario.cc.html#L57'>scenario</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To load files and run only the tests in explicitly loaded files (for apps):</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu --test-only-app test file1.mu file2.mu ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To load all files with a numeric prefix in a directory:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu directory1 directory2 ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  You can test directories just like files.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu test directory1 directory2 ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To pass ingredients to a mu program, provide them after '--':</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu file_or_dir1 file_or_dir2 ... -- ingredient1 ingredient2 ...</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;  To browse a <a href='003trace.cc.html#L161'>trace</a> generated by a previous run:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Constant">&quot;    mu browse-trace file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Delimiter">;</span>
 <span id="L43" class="LineNr"> 43 </span>  <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L44" class="LineNr"> 44 </span><span class="Delimiter">}</span>
 <span id="L45" class="LineNr"> 45 </span>
@@ -111,10 +112,10 @@ if ('onhashchange' in window) {
 <span id="L50" class="LineNr"> 50 </span><span class="Normal">char</span>** arg = &amp;argv[<span class="Constant">1</span>]<span class="Delimiter">;</span>
 <span id="L51" class="LineNr"> 51 </span><span class="Normal">while</span> <span class="Delimiter">(</span>argc &gt; <span class="Constant">1</span> &amp;&amp; <a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span>*arg<span class="Delimiter">,</span> <span class="Constant">&quot;--&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">)</span>
-<span id="L53" class="LineNr"> 53 </span>    <span class="Delimiter">;</span>  <span class="Comment">// no-op branch just so any further additions can consistently always start with 'else'</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Delimiter">;</span>  <span class="Comment">// no-op branch just so any further additions can consistently always start with 'else'</span>
 <span id="L54" class="LineNr"> 54 </span>  <span class="Comment">// End Commandline Options(*arg)</span>
 <span id="L55" class="LineNr"> 55 </span>  <span class="Normal">else</span>
-<span id="L56" class="LineNr"> 56 </span>    cerr &lt;&lt; <span class="Constant">&quot;skipping unknown option &quot;</span> &lt;&lt; *arg &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;skipping unknown option &quot;</span> &lt;&lt; *arg &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L57" class="LineNr"> 57 </span>  --argc<span class="Delimiter">;</span>  ++argv<span class="Delimiter">;</span>  ++arg<span class="Delimiter">;</span>
 <span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span>
 <span id="L59" class="LineNr"> 59 </span>
@@ -135,7 +136,7 @@ if ('onhashchange' in window) {
 <span id="L74" class="LineNr"> 74 </span><span class="Normal">bool</span> <a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; pat<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L75" class="LineNr"> 75 </span>  string::const_iterator a=s<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> b=pat<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">nada</span><span class="Comment">*/</span><span class="Delimiter">;</span>  a!=s<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> &amp;&amp; b!=pat<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++a<span class="Delimiter">,</span> ++b<span class="Delimiter">)</span>
-<span id="L77" class="LineNr"> 77 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*a != *b<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*a != *b<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Identifier">return</span> b == pat<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L79" class="LineNr"> 79 </span><span class="Delimiter">}</span>
 <span id="L80" class="LineNr"> 80 </span>
@@ -217,20 +218,20 @@ if ('onhashchange' in window) {
 <span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
 <span id="L157" class="LineNr">157 </span><span class="Normal">void</span> <a href='001help.cc.html#L157'>dump_and_exit</a><span class="Delimiter">(</span><span class="Normal">int</span> sig<span class="Delimiter">,</span> <a href='001help.cc.html#L255'>unused</a> siginfo_t* dummy1<span class="Delimiter">,</span> <a href='001help.cc.html#L255'>unused</a> <span class="Normal">void</span>* dummy2<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L158" class="LineNr">158 </span>  <span class="Normal">switch</span> <span class="Delimiter">(</span>sig<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L159" class="LineNr">159 </span>    <span class="Normal">case</span> <span class="Constant">SIGABRT</span>:
-<span id="L160" class="LineNr">160 </span><span class="PreProc">      #ifndef __APPLE__</span>
-<span id="L161" class="LineNr">161 </span>        cerr &lt;&lt; <span class="Constant">&quot;SIGABRT: might be an integer overflow if it wasn't an assert() failure</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L162" class="LineNr">162 </span>        _Exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L163" class="LineNr">163 </span><span class="PreProc">      #endif</span>
-<span id="L164" class="LineNr">164 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L165" class="LineNr">165 </span>    <span class="Normal">case</span> <span class="Constant">SIGILL</span>:
-<span id="L166" class="LineNr">166 </span><span class="PreProc">      #ifdef __APPLE__</span>
-<span id="L167" class="LineNr">167 </span>        cerr &lt;&lt; <span class="Constant">&quot;SIGILL: most likely caused by integer overflow</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L168" class="LineNr">168 </span>        _Exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L169" class="LineNr">169 </span><span class="PreProc">      #endif</span>
-<span id="L170" class="LineNr">170 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L171" class="LineNr">171 </span>    <span class="Normal">default</span>:
-<span id="L172" class="LineNr">172 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Normal">case</span> <span class="Constant">SIGABRT</span>:
+<span id="L160" class="LineNr">160 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> #ifndef __APPLE__</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;SIGABRT: might be an integer overflow if it wasn't an assert() failure</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> _Exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L163" class="LineNr">163 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> #endif</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Normal">case</span> <span class="Constant">SIGILL</span>:
+<span id="L166" class="LineNr">166 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> #ifdef __APPLE__</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;SIGILL: most likely caused by integer overflow</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> _Exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L169" class="LineNr">169 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> #endif</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Normal">default</span>:
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Delimiter">}</span>
 <span id="L174" class="LineNr">174 </span><span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
diff --git a/html/002test.cc.html b/html/002test.cc.html
index 3e69cef1..02db677f 100644
--- a/html/002test.cc.html
+++ b/html/002test.cc.html
@@ -16,7 +16,7 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
@@ -24,6 +24,7 @@ a:hover { text-decoration: underline; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .PreProc { color: #800080; }
 .CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -84,17 +85,17 @@ if ('onhashchange' in window) {
 <span id="L24" class="LineNr"> 24 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
 <span id="L25" class="LineNr"> 25 </span><span class="PreProc">#define CHECK(X) \</span>
 <span id="L26" class="LineNr"> 26 </span><span class="PreProc">  </span><span class="Normal">if</span><span class="PreProc"> (Passed &amp;&amp; !(X)) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
-<span id="L27" class="LineNr"> 27 </span><span class="PreProc">    cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): &quot;</span><span class="PreProc"> &lt;&lt; #X &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L28" class="LineNr"> 28 </span><span class="PreProc">    Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L29" class="LineNr"> 29 </span><span class="PreProc">    </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span><span class="PreProc"> \</span>
+<span id="L27" class="LineNr"> 27 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): &quot;</span><span class="PreProc"> &lt;&lt; #X &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L28" class="LineNr"> 28 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L29" class="LineNr"> 29 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span><span class="PreProc"> \</span>
 <span id="L30" class="LineNr"> 30 </span><span class="PreProc">  </span><span class="Delimiter">}</span>
 <span id="L31" class="LineNr"> 31 </span>
 <span id="L32" class="LineNr"> 32 </span><span class="PreProc">#define CHECK_EQ(X</span><span class="Delimiter">,</span><span class="PreProc"> Y) \</span>
 <span id="L33" class="LineNr"> 33 </span><span class="PreProc">  </span><span class="Normal">if</span><span class="PreProc"> (Passed &amp;&amp; (X) != (Y)) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
-<span id="L34" class="LineNr"> 34 </span><span class="PreProc">    cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): &quot;</span><span class="PreProc"> &lt;&lt; #X &lt;&lt; </span><span class="Constant">&quot; == &quot;</span><span class="PreProc"> &lt;&lt; #Y &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L35" class="LineNr"> 35 </span><span class="PreProc">    cerr &lt;&lt; </span><span class="Constant">&quot;  got &quot;</span><span class="PreProc"> &lt;&lt; (X) &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> BEWARE: multiple eval </span><span class="Comment">*/</span><span class="PreProc"> \</span>
-<span id="L36" class="LineNr"> 36 </span><span class="PreProc">    Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L37" class="LineNr"> 37 </span><span class="PreProc">    </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span><span class="PreProc"> \</span>
+<span id="L34" class="LineNr"> 34 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): &quot;</span><span class="PreProc"> &lt;&lt; #X &lt;&lt; </span><span class="Constant">&quot; == &quot;</span><span class="PreProc"> &lt;&lt; #Y &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L35" class="LineNr"> 35 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> cerr &lt;&lt; </span><span class="Constant">&quot;  got &quot;</span><span class="PreProc"> &lt;&lt; (X) &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> BEWARE: multiple eval </span><span class="Comment">*/</span><span class="PreProc"> \</span>
+<span id="L36" class="LineNr"> 36 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L37" class="LineNr"> 37 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span><span class="PreProc"> \</span>
 <span id="L38" class="LineNr"> 38 </span><span class="PreProc">  </span><span class="Delimiter">}</span>
 <span id="L39" class="LineNr"> 39 </span>
 <span id="L40" class="LineNr"> 40 </span><span class="Delimiter">:(before &quot;End Setup&quot;)</span>
@@ -115,15 +116,15 @@ if ('onhashchange' in window) {
 <span id="L55" class="LineNr"> 55 </span>  cerr &lt;&lt; <span class="Constant">&quot;C tests: &quot;</span> &lt;&lt; ctime<span class="Delimiter">(</span>&amp;t<span class="Delimiter">);</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">size_t</span> i=<span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <span class="Normal">sizeof</span><span class="Delimiter">(</span>Tests<span class="Delimiter">)</span>/<span class="Normal">sizeof</span><span class="Delimiter">(</span>Tests[<span class="Constant">0</span>]<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L57" class="LineNr"> 57 </span><span class="CommentedCode">//?     cerr &lt;&lt; i &lt;&lt; '\n';</span>
-<span id="L58" class="LineNr"> 58 </span>    <a href='002test.cc.html#L72'>run_test</a><span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <a href='002test.cc.html#L72'>run_test</a><span class="Delimiter">(</span>i<span class="Delimiter">);</span>
 <span id="L59" class="LineNr"> 59 </span>  <span class="Delimiter">}</span>
 <span id="L60" class="LineNr"> 60 </span>  cerr &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Comment">// End Tests</span>
 <span id="L62" class="LineNr"> 62 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Num_failures &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L63" class="LineNr"> 63 </span>    cerr &lt;&lt; Num_failures &lt;&lt; <span class="Constant">&quot; failure&quot;</span>
-<span id="L64" class="LineNr"> 64 </span>         &lt;&lt; <span class="Delimiter">(</span>Num_failures &gt; <span class="Constant">1</span> ? <span class="Constant">&quot;s&quot;</span> : <span class="Constant">&quot;&quot;</span><span class="Delimiter">)</span>
-<span id="L65" class="LineNr"> 65 </span>         &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L66" class="LineNr"> 66 </span>    <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; Num_failures &lt;&lt; <span class="Constant">&quot; failure&quot;</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="Delimiter">(</span>Num_failures &gt; <span class="Constant">1</span> ? <span class="Constant">&quot;s&quot;</span> : <span class="Constant">&quot;&quot;</span><span class="Delimiter">)</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Delimiter">}</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L69" class="LineNr"> 69 </span><span class="Delimiter">}</span>
@@ -131,8 +132,8 @@ if ('onhashchange' in window) {
 <span id="L71" class="LineNr"> 71 </span><span class="Delimiter">:(code)</span>
 <span id="L72" class="LineNr"> 72 </span><span class="Normal">void</span> <a href='002test.cc.html#L72'>run_test</a><span class="Delimiter">(</span><span class="Normal">size_t</span> i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt;= <span class="Normal">sizeof</span><span class="Delimiter">(</span>Tests<span class="Delimiter">)</span>/<span class="Normal">sizeof</span><span class="Delimiter">(</span>Tests[<span class="Constant">0</span>]<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L74" class="LineNr"> 74 </span>    cerr &lt;&lt; <span class="Constant">&quot;no test &quot;</span> &lt;&lt; i &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L75" class="LineNr"> 75 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;no test &quot;</span> &lt;&lt; i &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Delimiter">}</span>
 <span id="L77" class="LineNr"> 77 </span>  <a href='000organization.cc.html#L134'>setup</a><span class="Delimiter">();</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Comment">// End Test Setup</span>
@@ -145,8 +146,8 @@ if ('onhashchange' in window) {
 <span id="L85" class="LineNr"> 85 </span>
 <span id="L86" class="LineNr"> 86 </span><span class="Normal">bool</span> <a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Identifier">return</span> s<span class="Delimiter">.</span>find_first_not_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789-&quot;</span><span class="Delimiter">)</span> == string::npos  <span class="Comment">// no other characters</span>
-<span id="L88" class="LineNr"> 88 </span>      &amp;&amp; s<span class="Delimiter">.</span>find_first_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789&quot;</span><span class="Delimiter">)</span> != string::npos  <span class="Comment">// at least one digit</span>
-<span id="L89" class="LineNr"> 89 </span>      &amp;&amp; s<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'-'</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">)</span> == string::npos<span class="Delimiter">;</span>  <span class="Comment">// '-' only at first position</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; s<span class="Delimiter">.</span>find_first_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789&quot;</span><span class="Delimiter">)</span> != string::npos  <span class="Comment">// at least one digit</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; s<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'-'</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">)</span> == string::npos<span class="Delimiter">;</span>  <span class="Comment">// '-' only at first position</span>
 <span id="L90" class="LineNr"> 90 </span><span class="Delimiter">}</span>
 <span id="L91" class="LineNr"> 91 </span>
 <span id="L92" class="LineNr"> 92 </span><span class="Normal">int</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>string n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
diff --git a/html/003trace.cc.html b/html/003trace.cc.html
index 6aadb6cc..21005a48 100644
--- a/html/003trace.cc.html
+++ b/html/003trace.cc.html
@@ -16,13 +16,14 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .PreProc { color: #800080; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -165,15 +166,15 @@ if ('onhashchange' in window) {
 <span id="L106" class="LineNr">106 </span>  <a href='003trace.cc.html#L106'>~trace_stream</a><span class="Delimiter">()</span> <span class="Delimiter">{</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_stream<span class="Delimiter">)</span> <span class="Normal">delete</span> curr_stream<span class="Delimiter">;</span> <span class="Delimiter">}</span>
 <span id="L107" class="LineNr">107 </span>
 <span id="L108" class="LineNr">108 </span>  ostream&amp; stream<span class="Delimiter">(</span>string label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L109" class="LineNr">109 </span>    <span class="Identifier">return</span> stream<span class="Delimiter">(</span>Max_depth<span class="Delimiter">,</span> label<span class="Delimiter">);</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> stream<span class="Delimiter">(</span>Max_depth<span class="Delimiter">,</span> label<span class="Delimiter">);</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Delimiter">}</span>
 <span id="L111" class="LineNr">111 </span>
 <span id="L112" class="LineNr">112 </span>  ostream&amp; stream<span class="Delimiter">(</span><span class="Normal">int</span> depth<span class="Delimiter">,</span> string label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L113" class="LineNr">113 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>depth &gt; collect_depth<span class="Delimiter">)</span> <span class="Identifier">return</span> null_stream<span class="Delimiter">;</span>
-<span id="L114" class="LineNr">114 </span>    curr_stream = <span class="Normal">new</span> ostringstream<span class="Delimiter">;</span>
-<span id="L115" class="LineNr">115 </span>    curr_label = label<span class="Delimiter">;</span>
-<span id="L116" class="LineNr">116 </span>    curr_depth = depth<span class="Delimiter">;</span>
-<span id="L117" class="LineNr">117 </span>    <span class="Identifier">return</span> *curr_stream<span class="Delimiter">;</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>depth &gt; collect_depth<span class="Delimiter">)</span> <span class="Identifier">return</span> null_stream<span class="Delimiter">;</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> curr_stream = <span class="Normal">new</span> ostringstream<span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> curr_label = label<span class="Delimiter">;</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> curr_depth = depth<span class="Delimiter">;</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> *curr_stream<span class="Delimiter">;</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Delimiter">}</span>
 <span id="L119" class="LineNr">119 </span>
 <span id="L120" class="LineNr">120 </span>  <span class="Comment">// be sure to call this before messing with curr_stream or curr_label</span>
@@ -187,11 +188,11 @@ if ('onhashchange' in window) {
 <span id="L128" class="LineNr">128 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr_stream<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L129" class="LineNr">129 </span>  string curr_contents = curr_stream<span class="Delimiter">-&gt;</span>str<span class="Delimiter">();</span>
 <span id="L130" class="LineNr">130 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr_contents<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L131" class="LineNr">131 </span>    past_lines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span>curr_depth<span class="Delimiter">,</span> <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>curr_label<span class="Delimiter">),</span> curr_contents<span class="Delimiter">));</span>  <span class="Comment">// preserve indent in contents</span>
-<span id="L132" class="LineNr">132 </span>    <span class="Normal">if</span> <span class="Delimiter">((</span>!Hide_errors &amp;&amp; curr_label == <span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span>
-<span id="L133" class="LineNr">133 </span>        || Dump_trace
-<span id="L134" class="LineNr">134 </span>        || <span class="Delimiter">(</span>!Dump_label<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; curr_label == Dump_label<span class="Delimiter">))</span>
-<span id="L135" class="LineNr">135 </span>      cerr &lt;&lt; curr_label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; curr_contents &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> past_lines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span>curr_depth<span class="Delimiter">,</span> <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>curr_label<span class="Delimiter">),</span> curr_contents<span class="Delimiter">));</span>  <span class="Comment">// preserve indent in contents</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">((</span>!Hide_errors &amp;&amp; curr_label == <span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || Dump_trace
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || <span class="Delimiter">(</span>!Dump_label<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; curr_label == Dump_label<span class="Delimiter">))</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; curr_label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; curr_contents &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Delimiter">}</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Normal">delete</span> curr_stream<span class="Delimiter">;</span>
 <span id="L138" class="LineNr">138 </span>  curr_stream = <span class="Constant">NULL</span><span class="Delimiter">;</span>
@@ -203,9 +204,9 @@ if ('onhashchange' in window) {
 <span id="L144" class="LineNr">144 </span>  ostringstream output<span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  label = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L147" class="LineNr">147 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L148" class="LineNr">148 </span>      output &lt;&lt; std::setw<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">)</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>depth &lt;&lt; <span class="Constant">' '</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>contents &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L149" class="LineNr">149 </span>    <span class="Delimiter">}</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> output &lt;&lt; std::setw<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">)</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>depth &lt;&lt; <span class="Constant">' '</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>contents &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Identifier">return</span> output<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L151" class="LineNr">151 </span><span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span>
@@ -262,9 +263,9 @@ if ('onhashchange' in window) {
 <span id="L203" class="LineNr">203 </span>lease_tracer::<a href='003trace.cc.html#L203'>~lease_tracer</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Trace_stream<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// in case tests close Trace_stream</span>
 <span id="L205" class="LineNr">205 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Save_trace<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>    ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
-<span id="L207" class="LineNr">207 </span>    fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
-<span id="L208" class="LineNr">208 </span>    fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Delimiter">}</span>
 <span id="L210" class="LineNr">210 </span>  <span class="Normal">delete</span> Trace_stream<span class="Delimiter">,</span> Trace_stream = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L211" class="LineNr">211 </span><span class="Delimiter">}</span>
@@ -279,19 +280,19 @@ if ('onhashchange' in window) {
 <span id="L220" class="LineNr">220 </span><span class="PreProc">#define CHECK_TRACE_CONTAINS_ERRORS()  CHECK(trace_contains_errors())</span>
 <span id="L221" class="LineNr">221 </span><span class="PreProc">#define CHECK_TRACE_DOESNT_CONTAIN_ERRORS() \</span>
 <span id="L222" class="LineNr">222 </span><span class="PreProc">  </span><span class="Normal">if</span><span class="PreProc"> (Passed &amp;&amp; trace_contains_errors()) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
-<span id="L223" class="LineNr">223 </span><span class="PreProc">    cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): unexpected errors</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L224" class="LineNr">224 </span><span class="PreProc">    DUMP(</span><span class="Constant">&quot;error&quot;</span><span class="PreProc">)</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L225" class="LineNr">225 </span><span class="PreProc">    Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L226" class="LineNr">226 </span><span class="PreProc">    </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L223" class="LineNr">223 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): unexpected errors</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L224" class="LineNr">224 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> DUMP(</span><span class="Constant">&quot;error&quot;</span><span class="PreProc">)</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L225" class="LineNr">225 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L226" class="LineNr">226 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
 <span id="L227" class="LineNr">227 </span><span class="PreProc">  </span><span class="Delimiter">}</span>
 <span id="L228" class="LineNr">228 </span>
 <span id="L229" class="LineNr">229 </span><span class="PreProc">#define CHECK_TRACE_COUNT(label</span><span class="Delimiter">,</span><span class="PreProc"> count) \</span>
 <span id="L230" class="LineNr">230 </span><span class="PreProc">  </span><span class="Normal">if</span><span class="PreProc"> (Passed &amp;&amp; trace_count(label) != (count)) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
-<span id="L231" class="LineNr">231 </span><span class="PreProc">    cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): trace_count of &quot;</span><span class="PreProc"> &lt;&lt; label &lt;&lt; </span><span class="Constant">&quot; should be &quot;</span><span class="PreProc"> &lt;&lt; count &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L232" class="LineNr">232 </span><span class="PreProc">    cerr &lt;&lt; </span><span class="Constant">&quot;  got &quot;</span><span class="PreProc"> &lt;&lt; trace_count(label) &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> multiple eval </span><span class="Comment">*/</span><span class="PreProc"> \</span>
-<span id="L233" class="LineNr">233 </span><span class="PreProc">    DUMP(label)</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L234" class="LineNr">234 </span><span class="PreProc">    Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L235" class="LineNr">235 </span><span class="PreProc">    </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span><span class="PreProc"> \</span>
+<span id="L231" class="LineNr">231 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> cerr &lt;&lt; </span><span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span><span class="PreProc"> &lt;&lt; __FUNCTION__ &lt;&lt; </span><span class="Constant">&quot;(&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__FILE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;:&quot;</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">__LINE__</span><span class="PreProc"> &lt;&lt; </span><span class="Constant">&quot;): trace_count of &quot;</span><span class="PreProc"> &lt;&lt; label &lt;&lt; </span><span class="Constant">&quot; should be &quot;</span><span class="PreProc"> &lt;&lt; count &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L232" class="LineNr">232 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> cerr &lt;&lt; </span><span class="Constant">&quot;  got &quot;</span><span class="PreProc"> &lt;&lt; trace_count(label) &lt;&lt; </span><span class="cSpecial">'\n'</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> multiple eval </span><span class="Comment">*/</span><span class="PreProc"> \</span>
+<span id="L233" class="LineNr">233 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> DUMP(label)</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L234" class="LineNr">234 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> Passed = </span><span class="Constant">false</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L235" class="LineNr">235 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Identifier">return</span><span class="Delimiter">;</span><span class="PreProc">  </span><span class="Comment">/*</span><span class="Comment"> Currently we stop at the very first failure. </span><span class="Comment">*/</span><span class="PreProc"> \</span>
 <span id="L236" class="LineNr">236 </span><span class="PreProc">  </span><span class="Delimiter">}</span>
 <span id="L237" class="LineNr">237 </span>
 <span id="L238" class="LineNr">238 </span><span class="PreProc">#define CHECK_TRACE_DOESNT_CONTAIN(</span><span class="Delimiter">...</span><span class="PreProc">)  CHECK(trace_doesnt_contain(__VA_ARGS__))</span>
@@ -303,27 +304,27 @@ if ('onhashchange' in window) {
 <span id="L244" class="LineNr">244 </span>  vector&lt;string&gt; expected_lines = <a href='003trace.cc.html#L331'>split</a><span class="Delimiter">(</span>expected<span class="Delimiter">,</span> <span class="Constant">&quot;^D&quot;</span><span class="Delimiter">);</span>
 <span id="L245" class="LineNr">245 </span>  <span class="Normal">int</span> curr_expected_line = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L246" class="LineNr">246 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr_expected_line &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">)</span> &amp;&amp; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>empty<span class="Delimiter">())</span>
-<span id="L247" class="LineNr">247 </span>    ++curr_expected_line<span class="Delimiter">;</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> ++curr_expected_line<span class="Delimiter">;</span>
 <span id="L248" class="LineNr">248 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L249" class="LineNr">249 </span>  string label<span class="Delimiter">,</span> contents<span class="Delimiter">;</span>
 <span id="L250" class="LineNr">250 </span>  <a href='003trace.cc.html#L273'>split_label_contents</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">),</span> &amp;label<span class="Delimiter">,</span> &amp;contents<span class="Delimiter">);</span>
 <span id="L251" class="LineNr">251 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L252" class="LineNr">252 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L253" class="LineNr">253 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contents != <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L254" class="LineNr">254 </span>    ++curr_expected_line<span class="Delimiter">;</span>
-<span id="L255" class="LineNr">255 </span>    <span class="Normal">while</span> <span class="Delimiter">(</span>curr_expected_line &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">)</span> &amp;&amp; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>empty<span class="Delimiter">())</span>
-<span id="L256" class="LineNr">256 </span>      ++curr_expected_line<span class="Delimiter">;</span>
-<span id="L257" class="LineNr">257 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L258" class="LineNr">258 </span>    <a href='003trace.cc.html#L273'>split_label_contents</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">),</span> &amp;label<span class="Delimiter">,</span> &amp;contents<span class="Delimiter">);</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contents != <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> ++curr_expected_line<span class="Delimiter">;</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>curr_expected_line &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">)</span> &amp;&amp; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>empty<span class="Delimiter">())</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++curr_expected_line<span class="Delimiter">;</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L273'>split_label_contents</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">),</span> &amp;label<span class="Delimiter">,</span> &amp;contents<span class="Delimiter">);</span>
 <span id="L259" class="LineNr">259 </span>  <span class="Delimiter">}</span>
 <span id="L260" class="LineNr">260 </span>
 <span id="L261" class="LineNr">261 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L286'>line_exists_anywhere</a><span class="Delimiter">(</span>label<span class="Delimiter">,</span> contents<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L262" class="LineNr">262 </span>    cerr &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; FUNCTION &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Normal">FILE</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; LINE &lt;&lt; <span class="Constant">&quot;): line [&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;] out of order in <a href='003trace.cc.html#L161'>trace</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L263" class="LineNr">263 </span>    <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; FUNCTION &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Normal">FILE</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; LINE &lt;&lt; <span class="Constant">&quot;): line [&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;] out of order in <a href='003trace.cc.html#L161'>trace</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L264" class="LineNr">264 </span>  <span class="Delimiter">}</span>
 <span id="L265" class="LineNr">265 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L266" class="LineNr">266 </span>    cerr &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; FUNCTION &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Normal">FILE</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; LINE &lt;&lt; <span class="Constant">&quot;): missing [&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;] in <a href='003trace.cc.html#L161'>trace</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L267" class="LineNr">267 </span>    <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; FUNCTION &lt;&lt; <span class="Constant">&quot;(&quot;</span> &lt;&lt; <span class="Normal">FILE</span> &lt;&lt; <span class="Constant">&quot;:&quot;</span> &lt;&lt; LINE &lt;&lt; <span class="Constant">&quot;): missing [&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;] in <a href='003trace.cc.html#L161'>trace</a>:</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
 <span id="L268" class="LineNr">268 </span>  <span class="Delimiter">}</span>
 <span id="L269" class="LineNr">269 </span>  Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L270" class="LineNr">270 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
@@ -333,19 +334,19 @@ if ('onhashchange' in window) {
 <span id="L274" class="LineNr">274 </span>  <span class="Normal">static</span> <span class="Normal">const</span> string delim<span class="Delimiter">(</span><span class="Constant">&quot;: &quot;</span><span class="Delimiter">);</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Normal">size_t</span> pos = s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
 <span id="L276" class="LineNr">276 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>pos == string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L277" class="LineNr">277 </span>    *label = <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
-<span id="L278" class="LineNr">278 </span>    *contents = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">);</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> *label = <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> *contents = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">);</span>
 <span id="L279" class="LineNr">279 </span>  <span class="Delimiter">}</span>
 <span id="L280" class="LineNr">280 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L281" class="LineNr">281 </span>    *label = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> pos<span class="Delimiter">));</span>
-<span id="L282" class="LineNr">282 </span>    *contents = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span>pos+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">)));</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> *label = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> pos<span class="Delimiter">));</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> *contents = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>s<span class="Delimiter">.</span>substr<span class="Delimiter">(</span>pos+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">)));</span>
 <span id="L283" class="LineNr">283 </span>  <span class="Delimiter">}</span>
 <span id="L284" class="LineNr">284 </span><span class="Delimiter">}</span>
 <span id="L285" class="LineNr">285 </span>
 <span id="L286" class="LineNr">286 </span><span class="Normal">bool</span> <a href='003trace.cc.html#L286'>line_exists_anywhere</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; label<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; contents<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L287" class="LineNr">287 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L288" class="LineNr">288 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L289" class="LineNr">289 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contents == <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contents == <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L290" class="LineNr">290 </span>  <span class="Delimiter">}</span>
 <span id="L291" class="LineNr">291 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L292" class="LineNr">292 </span><span class="Delimiter">}</span>
@@ -358,10 +359,10 @@ if ('onhashchange' in window) {
 <span id="L299" class="LineNr">299 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Trace_stream<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L300" class="LineNr">300 </span>  <span class="Normal">long</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L301" class="LineNr">301 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L302" class="LineNr">302 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L303" class="LineNr">303 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>line == <span class="Constant">&quot;&quot;</span> || <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>line<span class="Delimiter">)</span> == <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span>
-<span id="L304" class="LineNr">304 </span>        ++result<span class="Delimiter">;</span>
-<span id="L305" class="LineNr">305 </span>    <span class="Delimiter">}</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>line == <span class="Constant">&quot;&quot;</span> || <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>line<span class="Delimiter">)</span> == <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++result<span class="Delimiter">;</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L306" class="LineNr">306 </span>  <span class="Delimiter">}</span>
 <span id="L307" class="LineNr">307 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L308" class="LineNr">308 </span><span class="Delimiter">}</span>
@@ -370,10 +371,10 @@ if ('onhashchange' in window) {
 <span id="L311" class="LineNr">311 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Trace_stream<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L312" class="LineNr">312 </span>  <span class="Normal">long</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L313" class="LineNr">313 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L314" class="LineNr">314 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L315" class="LineNr">315 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span><a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">),</span> <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>prefix<span class="Delimiter">)))</span>
-<span id="L316" class="LineNr">316 </span>        ++result<span class="Delimiter">;</span>
-<span id="L317" class="LineNr">317 </span>    <span class="Delimiter">}</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>label == p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span><a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">),</span> <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>prefix<span class="Delimiter">)))</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++result<span class="Delimiter">;</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L318" class="LineNr">318 </span>  <span class="Delimiter">}</span>
 <span id="L319" class="LineNr">319 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L320" class="LineNr">320 </span><span class="Delimiter">}</span>
@@ -391,13 +392,13 @@ if ('onhashchange' in window) {
 <span id="L332" class="LineNr">332 </span>  vector&lt;string&gt; result<span class="Delimiter">;</span>
 <span id="L333" class="LineNr">333 </span>  <span class="Normal">size_t</span> begin=<span class="Constant">0</span><span class="Delimiter">,</span> end=s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
 <span id="L334" class="LineNr">334 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L335" class="LineNr">335 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L185'>end</a> == string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L336" class="LineNr">336 </span>      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> begin<span class="Delimiter">,</span> string::npos<span class="Delimiter">));</span>
-<span id="L337" class="LineNr">337 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L338" class="LineNr">338 </span>    <span class="Delimiter">}</span>
-<span id="L339" class="LineNr">339 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> begin<span class="Delimiter">,</span> end-begin<span class="Delimiter">));</span>
-<span id="L340" class="LineNr">340 </span>    begin = end+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
-<span id="L341" class="LineNr">341 </span>    <a href='003trace.cc.html#L185'>end</a> = s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">,</span> begin<span class="Delimiter">);</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L185'>end</a> == string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> begin<span class="Delimiter">,</span> string::npos<span class="Delimiter">));</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> begin<span class="Delimiter">,</span> end-begin<span class="Delimiter">));</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> begin = end+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L185'>end</a> = s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">,</span> begin<span class="Delimiter">);</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Delimiter">}</span>
 <span id="L343" class="LineNr">343 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L344" class="LineNr">344 </span><span class="Delimiter">}</span>
@@ -407,19 +408,19 @@ if ('onhashchange' in window) {
 <span id="L348" class="LineNr">348 </span>  <span class="Normal">size_t</span> end=s<span class="Delimiter">.</span>find<span class="Delimiter">(</span>delim<span class="Delimiter">);</span>
 <span id="L349" class="LineNr">349 </span>  result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">));</span>
 <span id="L350" class="LineNr">350 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='003trace.cc.html#L185'>end</a> != string::npos<span class="Delimiter">)</span>
-<span id="L351" class="LineNr">351 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> end+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">),</span> string::npos<span class="Delimiter">));</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>string<span class="Delimiter">(</span>s<span class="Delimiter">,</span> end+SIZE<span class="Delimiter">(</span>delim<span class="Delimiter">),</span> string::npos<span class="Delimiter">));</span>
 <span id="L352" class="LineNr">352 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L353" class="LineNr">353 </span><span class="Delimiter">}</span>
 <span id="L354" class="LineNr">354 </span>
 <span id="L355" class="LineNr">355 </span>string <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L356" class="LineNr">356 </span>  string::const_iterator first = s<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
 <span id="L357" class="LineNr">357 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>first != s<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> &amp;&amp; isspace<span class="Delimiter">(</span>*first<span class="Delimiter">))</span>
-<span id="L358" class="LineNr">358 </span>    ++first<span class="Delimiter">;</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> ++first<span class="Delimiter">;</span>
 <span id="L359" class="LineNr">359 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>first == s<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
 <span id="L360" class="LineNr">360 </span>
 <span id="L361" class="LineNr">361 </span>  string::const_iterator last = --s<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L362" class="LineNr">362 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>last != s<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> &amp;&amp; isspace<span class="Delimiter">(</span>*last<span class="Delimiter">))</span>
-<span id="L363" class="LineNr">363 </span>    --last<span class="Delimiter">;</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span> --last<span class="Delimiter">;</span>
 <span id="L364" class="LineNr">364 </span>  ++last<span class="Delimiter">;</span>
 <span id="L365" class="LineNr">365 </span>  <span class="Identifier">return</span> string<span class="Delimiter">(</span>first<span class="Delimiter">,</span> last<span class="Delimiter">);</span>
 <span id="L366" class="LineNr">366 </span><span class="Delimiter">}</span>
diff --git a/html/003trace.test.cc.html b/html/003trace.test.cc.html
index efd93367..c413346f 100644
--- a/html/003trace.test.cc.html
+++ b/html/003trace.test.cc.html
@@ -16,11 +16,11 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
diff --git a/html/010vm.cc.html b/html/010vm.cc.html
index 25bdf097..72c39b11 100644
--- a/html/010vm.cc.html
+++ b/html/010vm.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
-.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.PreProc { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.PreProc { color: #800080; }
+.muRecipe { color: #ff8700; }
 .CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -210,8 +211,8 @@ if ('onhashchange' in window) {
 <span id="L148" class="LineNr">148 </span><span class="Delimiter">}</span>
 <span id="L149" class="LineNr">149 </span><span class="Normal">void</span> <a href='010vm.cc.html#L149'>teardown_types</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;type_ordinal<span class="Delimiter">,</span> type_info&gt;::iterator p = Type<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L151" class="LineNr">151 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L152" class="LineNr">152 </span>      p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L153" class="LineNr">153 </span>  <span class="Delimiter">}</span>
 <span id="L154" class="LineNr">154 </span>  Type_ordinal<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L155" class="LineNr">155 </span><span class="Delimiter">}</span>
@@ -242,7 +243,7 @@ if ('onhashchange' in window) {
 <span id="L180" class="LineNr">180 </span>  vector&lt;reagent&gt; elements<span class="Delimiter">;</span>
 <span id="L181" class="LineNr">181 </span>  <span class="Comment">// End type_info Fields</span>
 <span id="L182" class="LineNr">182 </span>  type_info<span class="Delimiter">()</span> :kind<span class="Delimiter">(</span><a href='010vm.cc.html#L172'>PRIMITIVE</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L183" class="LineNr">183 </span>    <span class="Comment">// End type_info Constructor</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Comment">// End type_info Constructor</span>
 <span id="L184" class="LineNr">184 </span>  <span class="Delimiter">}</span>
 <span id="L185" class="LineNr">185 </span><span class="Delimiter">};</span>
 <span id="L186" class="LineNr">186 </span>
@@ -350,9 +351,9 @@ if ('onhashchange' in window) {
 <span id="L288" class="LineNr">288 </span>  <span class="Normal">delete</span> type_names<span class="Delimiter">;</span>
 <span id="L289" class="LineNr">289 </span>  <span class="Comment">// special cases</span>
 <span id="L290" class="LineNr">290 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>name<span class="Delimiter">)</span> &amp;&amp; type == <span class="Constant">NULL</span><span class="Delimiter">)</span>
-<span id="L291" class="LineNr">291 </span>    type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;literal&quot;</span><span class="Delimiter">);</span>
+<span id="L291" class="LineNr">291 </span>  <span class="Conceal">¦</span> type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;literal&quot;</span><span class="Delimiter">);</span>
 <span id="L292" class="LineNr">292 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>name == <span class="Constant">&quot;_&quot;</span> &amp;&amp; type == <span class="Constant">NULL</span><span class="Delimiter">)</span>
-<span id="L293" class="LineNr">293 </span>    type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;literal&quot;</span><span class="Delimiter">);</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;literal&quot;</span><span class="Delimiter">);</span>
 <span id="L294" class="LineNr">294 </span>  <span class="Comment">// other properties</span>
 <span id="L295" class="LineNr">295 </span>  slurp_properties<span class="Delimiter">(</span>in<span class="Delimiter">,</span> properties<span class="Delimiter">);</span>
 <span id="L296" class="LineNr">296 </span>  <span class="Comment">// End Parsing reagent</span>
@@ -360,11 +361,11 @@ if ('onhashchange' in window) {
 <span id="L298" class="LineNr">298 </span>
 <span id="L299" class="LineNr">299 </span><span class="Normal">void</span> slurp_properties<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> vector&lt;pair&lt;string<span class="Delimiter">,</span> string_tree*&gt; &gt;&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L300" class="LineNr">300 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L301" class="LineNr">301 </span>    istringstream row<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">'/'</span><span class="Delimiter">));</span>
-<span id="L302" class="LineNr">302 </span>    row &gt;&gt; std::noskipws<span class="Delimiter">;</span>
-<span id="L303" class="LineNr">303 </span>    string key = slurp_until<span class="Delimiter">(</span>row<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
-<span id="L304" class="LineNr">304 </span>    string_tree* value = parse_property_list<span class="Delimiter">(</span>row<span class="Delimiter">);</span>
-<span id="L305" class="LineNr">305 </span>    out<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> istringstream row<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">'/'</span><span class="Delimiter">));</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> row &gt;&gt; std::noskipws<span class="Delimiter">;</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> string key = slurp_until<span class="Delimiter">(</span>row<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> string_tree* value = parse_property_list<span class="Delimiter">(</span>row<span class="Delimiter">);</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> out<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
 <span id="L306" class="LineNr">306 </span>  <span class="Delimiter">}</span>
 <span id="L307" class="LineNr">307 </span><span class="Delimiter">}</span>
 <span id="L308" class="LineNr">308 </span>
@@ -375,7 +376,7 @@ if ('onhashchange' in window) {
 <span id="L313" class="LineNr">313 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">return</span> first<span class="Delimiter">;</span>
 <span id="L314" class="LineNr">314 </span>  string_tree* rest = parse_property_list<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; rest<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L316" class="LineNr">316 </span>    <span class="Identifier">return</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>first<span class="Delimiter">,</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>rest<span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>first<span class="Delimiter">,</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>rest<span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Identifier">return</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>first<span class="Delimiter">,</span> rest<span class="Delimiter">);</span>
 <span id="L318" class="LineNr">318 </span><span class="Delimiter">}</span>
 <span id="L319" class="LineNr">319 </span><span class="Delimiter">:(before &quot;End Unit Tests&quot;)</span>
@@ -402,20 +403,20 @@ if ('onhashchange' in window) {
 <span id="L340" class="LineNr">340 </span>type_tree* <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span><span class="Normal">const</span> string_tree* properties<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L341" class="LineNr">341 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!properties<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L343" class="LineNr">343 </span>    <span class="Normal">const</span> string&amp; type_name = properties<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
-<span id="L344" class="LineNr">344 </span>    <span class="Normal">int</span> value = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L345" class="LineNr">345 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">))</span>
-<span id="L346" class="LineNr">346 </span>      value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">);</span>
-<span id="L347" class="LineNr">347 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>type_name<span class="Delimiter">))</span>  <span class="Comment">// sometimes types will contain non-type tags, like numbers for the size of an array</span>
-<span id="L348" class="LineNr">348 </span>      value = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L349" class="LineNr">349 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>value == <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span>  <span class="Comment">// used in recipe types</span>
-<span id="L350" class="LineNr">350 </span>      value = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L351" class="LineNr">351 </span>    <span class="Normal">else</span>
-<span id="L352" class="LineNr">352 </span>      value = -<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// should never happen; will trigger errors later</span>
-<span id="L353" class="LineNr">353 </span>    <span class="Identifier">return</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>type_name<span class="Delimiter">,</span> value<span class="Delimiter">);</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> string&amp; type_name = properties<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+<span id="L344" class="LineNr">344 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> value = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">))</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">);</span>
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>type_name<span class="Delimiter">))</span>  <span class="Comment">// sometimes types will contain non-type tags, like numbers for the size of an array</span>
+<span id="L348" class="LineNr">348 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> value = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L349" class="LineNr">349 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>value == <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span>  <span class="Comment">// used in recipe types</span>
+<span id="L350" class="LineNr">350 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> value = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> value = -<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// should never happen; will trigger errors later</span>
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>type_name<span class="Delimiter">,</span> value<span class="Delimiter">);</span>
 <span id="L354" class="LineNr">354 </span>  <span class="Delimiter">}</span>
 <span id="L355" class="LineNr">355 </span>  <span class="Identifier">return</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>left<span class="Delimiter">),</span>
-<span id="L356" class="LineNr">356 </span>                       <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>right<span class="Delimiter">));</span>
+<span id="L356" class="LineNr">356 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>  <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>properties<span class="Delimiter">-&gt;</span>right<span class="Delimiter">));</span>
 <span id="L357" class="LineNr">357 </span><span class="Delimiter">}</span>
 <span id="L358" class="LineNr">358 </span>
 <span id="L359" class="LineNr">359 </span><span class="Comment">//: avoid memory leaks for the type tree</span>
@@ -426,7 +427,7 @@ if ('onhashchange' in window) {
 <span id="L364" class="LineNr">364 </span>  value = other<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L365" class="LineNr">365 </span>  initialized = other<span class="Delimiter">.</span>initialized<span class="Delimiter">;</span>
 <span id="L366" class="LineNr">366 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L367" class="LineNr">367 </span>    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> copy<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)));</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span> properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> copy<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)));</span>
 <span id="L368" class="LineNr">368 </span>  <span class="Delimiter">}</span>
 <span id="L369" class="LineNr">369 </span>  type = copy<span class="Delimiter">(</span>other<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L370" class="LineNr">370 </span>  <span class="Comment">// End reagent Copy Constructor</span>
@@ -454,9 +455,9 @@ if ('onhashchange' in window) {
 <span id="L392" class="LineNr">392 </span><span class="Normal">bool</span> type_tree::<span class="Normal">operator</span>==<span class="Delimiter">(</span><span class="Normal">const</span> type_tree&amp; other<span class="Delimiter">)</span> <span class="Normal">const</span> <span class="Delimiter">{</span>
 <span id="L393" class="LineNr">393 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>atom != other<span class="Delimiter">.</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L394" class="LineNr">394 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>atom<span class="Delimiter">)</span>
-<span id="L395" class="LineNr">395 </span>    <span class="Identifier">return</span> name == other<span class="Delimiter">.</span>name &amp;&amp; value == other<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> name == other<span class="Delimiter">.</span>name &amp;&amp; value == other<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L396" class="LineNr">396 </span>  <span class="Identifier">return</span> <span class="Delimiter">(</span>left == other<span class="Delimiter">.</span>left || *left == *other<span class="Delimiter">.</span>left<span class="Delimiter">)</span>
-<span id="L397" class="LineNr">397 </span>      &amp;&amp; <span class="Delimiter">(</span>right == other<span class="Delimiter">.</span>right || *right == *other<span class="Delimiter">.</span>right<span class="Delimiter">);</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; <span class="Delimiter">(</span>right == other<span class="Delimiter">.</span>right || *right == *other<span class="Delimiter">.</span>right<span class="Delimiter">);</span>
 <span id="L398" class="LineNr">398 </span><span class="Delimiter">}</span>
 <span id="L399" class="LineNr">399 </span>
 <span id="L400" class="LineNr">400 </span><span class="Comment">// only constraint we care about: if a &lt; b then !(b &lt; a)</span>
@@ -474,8 +475,8 @@ if ('onhashchange' in window) {
 <span id="L412" class="LineNr">412 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>right == other<span class="Delimiter">.</span>right || *right == *other<span class="Delimiter">.</span>right<span class="Delimiter">)</span> <span class="Identifier">return</span> left &amp;&amp; *left &lt; *other<span class="Delimiter">.</span>left<span class="Delimiter">;</span>
 <span id="L413" class="LineNr">413 </span>  <span class="Comment">// if the two sides criss-cross, pick the side with the smaller lhs</span>
 <span id="L414" class="LineNr">414 </span>  <span class="Normal">if</span> <span class="Delimiter">((</span>left == other<span class="Delimiter">.</span>right || *left == *other<span class="Delimiter">.</span>right<span class="Delimiter">)</span>
-<span id="L415" class="LineNr">415 </span>      &amp;&amp; <span class="Delimiter">(</span>right == other<span class="Delimiter">.</span>left || *right == *other<span class="Delimiter">.</span>left<span class="Delimiter">))</span>
-<span id="L416" class="LineNr">416 </span>    <span class="Identifier">return</span> *left &lt; *other<span class="Delimiter">.</span>left<span class="Delimiter">;</span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; <span class="Delimiter">(</span>right == other<span class="Delimiter">.</span>left || *right == *other<span class="Delimiter">.</span>left<span class="Delimiter">))</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> *left &lt; *other<span class="Delimiter">.</span>left<span class="Delimiter">;</span>
 <span id="L417" class="LineNr">417 </span>  <span class="Comment">// now the hard case: both sides are not equal</span>
 <span id="L418" class="LineNr">418 </span>  <span class="Comment">// make sure we stay consistent between (a &lt; b) and (b &lt; a)</span>
 <span id="L419" class="LineNr">419 </span>  <span class="Comment">// just return the side with the smallest of the 4 branches</span>
@@ -537,10 +538,10 @@ if ('onhashchange' in window) {
 <span id="L475" class="LineNr">475 </span>reagent&amp; reagent::<span class="Normal">operator</span>=<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; other<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L476" class="LineNr">476 </span>  original_string = other<span class="Delimiter">.</span>original_string<span class="Delimiter">;</span>
 <span id="L477" class="LineNr">477 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L478" class="LineNr">478 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> <span class="Normal">delete</span> properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> <span class="Normal">delete</span> properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
 <span id="L479" class="LineNr">479 </span>  properties<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L480" class="LineNr">480 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L481" class="LineNr">481 </span>    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> copy<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)));</span>
+<span id="L481" class="LineNr">481 </span>  <span class="Conceal">¦</span> properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> copy<span class="Delimiter">(</span>other<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)));</span>
 <span id="L482" class="LineNr">482 </span>  name = other<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
 <span id="L483" class="LineNr">483 </span>  value = other<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L484" class="LineNr">484 </span>  initialized = other<span class="Delimiter">.</span>initialized<span class="Delimiter">;</span>
@@ -556,10 +557,10 @@ if ('onhashchange' in window) {
 <span id="L494" class="LineNr">494 </span>
 <span id="L495" class="LineNr">495 </span><span class="Normal">void</span> reagent::<a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L497" class="LineNr">497 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L498" class="LineNr">498 </span>      <span class="Normal">delete</span> properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
-<span id="L499" class="LineNr">499 </span>      properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second = <span class="Constant">NULL</span><span class="Delimiter">;</span>
-<span id="L500" class="LineNr">500 </span>    <span class="Delimiter">}</span>
+<span id="L497" class="LineNr">497 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L501" class="LineNr">501 </span>  <span class="Delimiter">}</span>
 <span id="L502" class="LineNr">502 </span>  <span class="Normal">delete</span> type<span class="Delimiter">;</span>
 <span id="L503" class="LineNr">503 </span>  type = <span class="Constant">NULL</span><span class="Delimiter">;</span>
@@ -575,8 +576,8 @@ if ('onhashchange' in window) {
 <span id="L513" class="LineNr">513 </span>
 <span id="L514" class="LineNr">514 </span><span class="Normal">void</span> append<span class="Delimiter">(</span>type_tree*&amp; base<span class="Delimiter">,</span> type_tree* extra<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L515" class="LineNr">515 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L516" class="LineNr">516 </span>    base = extra<span class="Delimiter">;</span>
-<span id="L517" class="LineNr">517 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L516" class="LineNr">516 </span>  <span class="Conceal">¦</span> base = extra<span class="Delimiter">;</span>
+<span id="L517" class="LineNr">517 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L518" class="LineNr">518 </span>  <span class="Delimiter">}</span>
 <span id="L519" class="LineNr">519 </span>  type_tree* curr = base<span class="Delimiter">;</span>
 <span id="L520" class="LineNr">520 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
@@ -585,8 +586,8 @@ if ('onhashchange' in window) {
 <span id="L523" class="LineNr">523 </span>
 <span id="L524" class="LineNr">524 </span><span class="Normal">void</span> append<span class="Delimiter">(</span>string_tree*&amp; base<span class="Delimiter">,</span> string_tree* extra<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L525" class="LineNr">525 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L526" class="LineNr">526 </span>    base = extra<span class="Delimiter">;</span>
-<span id="L527" class="LineNr">527 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L526" class="LineNr">526 </span>  <span class="Conceal">¦</span> base = extra<span class="Delimiter">;</span>
+<span id="L527" class="LineNr">527 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L528" class="LineNr">528 </span>  <span class="Delimiter">}</span>
 <span id="L529" class="LineNr">529 </span>  string_tree* curr = base<span class="Delimiter">;</span>
 <span id="L530" class="LineNr">530 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
@@ -597,26 +598,26 @@ if ('onhashchange' in window) {
 <span id="L535" class="LineNr">535 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L536" class="LineNr">536 </span>  <span class="Normal">char</span> c<span class="Delimiter">;</span>
 <span id="L537" class="LineNr">537 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L538" class="LineNr">538 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == delim<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L539" class="LineNr">539 </span>      <span class="Comment">// drop the delim</span>
-<span id="L540" class="LineNr">540 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L541" class="LineNr">541 </span>    <span class="Delimiter">}</span>
-<span id="L542" class="LineNr">542 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L538" class="LineNr">538 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == delim<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// drop the delim</span>
+<span id="L540" class="LineNr">540 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L541" class="LineNr">541 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
 <span id="L543" class="LineNr">543 </span>  <span class="Delimiter">}</span>
 <span id="L544" class="LineNr">544 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L545" class="LineNr">545 </span><span class="Delimiter">}</span>
 <span id="L546" class="LineNr">546 </span>
 <span id="L547" class="LineNr">547 </span><span class="Normal">bool</span> has_property<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L548" class="LineNr">548 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L549" class="LineNr">549 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == name<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == name<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L550" class="LineNr">550 </span>  <span class="Delimiter">}</span>
 <span id="L551" class="LineNr">551 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L552" class="LineNr">552 </span><span class="Delimiter">}</span>
 <span id="L553" class="LineNr">553 </span>
 <span id="L554" class="LineNr">554 </span>string_tree* property<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; r<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L555" class="LineNr">555 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> p = <span class="Constant">0</span><span class="Delimiter">;</span>  p != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L556" class="LineNr">556 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">).</span>first == name<span class="Delimiter">)</span>
-<span id="L557" class="LineNr">557 </span>      <span class="Identifier">return</span> r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
+<span id="L556" class="LineNr">556 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">).</span>first == name<span class="Delimiter">)</span>
+<span id="L557" class="LineNr">557 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
 <span id="L558" class="LineNr">558 </span>  <span class="Delimiter">}</span>
 <span id="L559" class="LineNr">559 </span>  <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L560" class="LineNr">560 </span><span class="Delimiter">}</span>
@@ -636,17 +637,17 @@ if ('onhashchange' in window) {
 <span id="L574" class="LineNr">574 </span><span class="Delimiter">:(code)</span>
 <span id="L575" class="LineNr">575 </span><span class="Normal">void</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L576" class="LineNr">576 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L577" class="LineNr">577 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L578" class="LineNr">578 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L579" class="LineNr">579 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L580" class="LineNr">580 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L581" class="LineNr">581 </span>    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L577" class="LineNr">577 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L578" class="LineNr">578 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L579" class="LineNr">579 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L580" class="LineNr">580 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L581" class="LineNr">581 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L582" class="LineNr">582 </span>  <span class="Delimiter">}</span>
 <span id="L583" class="LineNr">583 </span><span class="Delimiter">}</span>
 <span id="L584" class="LineNr">584 </span>
 <span id="L585" class="LineNr">585 </span><span class="Normal">void</span> dump_memory<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L586" class="LineNr">586 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">double</span>&gt;::iterator p = Memory<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Memory<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L587" class="LineNr">587 </span>    cout &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L587" class="LineNr">587 </span>  <span class="Conceal">¦</span> cout &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L588" class="LineNr">588 </span>  <span class="Delimiter">}</span>
 <span id="L589" class="LineNr">589 </span><span class="Delimiter">}</span>
 <span id="L590" class="LineNr">590 </span>
@@ -660,7 +661,7 @@ if ('onhashchange' in window) {
 <span id="L598" class="LineNr">598 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L599" class="LineNr">599 </span>  out &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; r<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L600" class="LineNr">600 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L601" class="LineNr">601 </span>    out &lt;&lt; <span class="Constant">&quot;  &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L601" class="LineNr">601 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;  &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L602" class="LineNr">602 </span>  out &lt;&lt; <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L603" class="LineNr">603 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L604" class="LineNr">604 </span><span class="Delimiter">}</span>
@@ -670,14 +671,14 @@ if ('onhashchange' in window) {
 <span id="L608" class="LineNr">608 </span>  out &lt;&lt; <span class="Constant">&quot;- <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L609" class="LineNr">609 </span>  <span class="Comment">// Begin debug_string(recipe x)</span>
 <span id="L610" class="LineNr">610 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L611" class="LineNr">611 </span>    <span class="Normal">const</span> instruction&amp; inst = x<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L612" class="LineNr">612 </span>    out &lt;&lt; <span class="Constant">&quot;inst: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L613" class="LineNr">613 </span>    out &lt;&lt; <span class="Constant">&quot;  ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L614" class="LineNr">614 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L615" class="LineNr">615 </span>      out &lt;&lt; <span class="Constant">&quot;    &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L616" class="LineNr">616 </span>    out &lt;&lt; <span class="Constant">&quot;  products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L617" class="LineNr">617 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L618" class="LineNr">618 </span>      out &lt;&lt; <span class="Constant">&quot;    &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L611" class="LineNr">611 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = x<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L612" class="LineNr">612 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;inst: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L613" class="LineNr">613 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;  ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L614" class="LineNr">614 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L615" class="LineNr">615 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;    &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L616" class="LineNr">616 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;  products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L617" class="LineNr">617 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L618" class="LineNr">618 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;    &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L619" class="LineNr">619 </span>  <span class="Delimiter">}</span>
 <span id="L620" class="LineNr">620 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L621" class="LineNr">621 </span><span class="Delimiter">}</span>
@@ -686,14 +687,14 @@ if ('onhashchange' in window) {
 <span id="L624" class="LineNr">624 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">return</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">;</span>
 <span id="L625" class="LineNr">625 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L626" class="LineNr">626 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L627" class="LineNr">627 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
-<span id="L628" class="LineNr">628 </span>    out &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string<span class="Delimiter">;</span>
+<span id="L627" class="LineNr">627 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
+<span id="L628" class="LineNr">628 </span>  <span class="Conceal">¦</span> out &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string<span class="Delimiter">;</span>
 <span id="L629" class="LineNr">629 </span>  <span class="Delimiter">}</span>
 <span id="L630" class="LineNr">630 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> out &lt;&lt; <span class="Constant">&quot; &lt;- &quot;</span><span class="Delimiter">;</span>
 <span id="L631" class="LineNr">631 </span>  out &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
 <span id="L632" class="LineNr">632 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L633" class="LineNr">633 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
-<span id="L634" class="LineNr">634 </span>    out &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string<span class="Delimiter">;</span>
+<span id="L633" class="LineNr">633 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
+<span id="L634" class="LineNr">634 </span>  <span class="Conceal">¦</span> out &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string<span class="Delimiter">;</span>
 <span id="L635" class="LineNr">635 </span>  <span class="Delimiter">}</span>
 <span id="L636" class="LineNr">636 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L637" class="LineNr">637 </span><span class="Delimiter">}</span>
@@ -702,14 +703,14 @@ if ('onhashchange' in window) {
 <span id="L640" class="LineNr">640 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">return</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">;</span>
 <span id="L641" class="LineNr">641 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L642" class="LineNr">642 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L643" class="LineNr">643 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
-<span id="L644" class="LineNr">644 </span>    out &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L643" class="LineNr">643 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
+<span id="L644" class="LineNr">644 </span>  <span class="Conceal">¦</span> out &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L645" class="LineNr">645 </span>  <span class="Delimiter">}</span>
 <span id="L646" class="LineNr">646 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> out &lt;&lt; <span class="Constant">&quot; &lt;- &quot;</span><span class="Delimiter">;</span>
 <span id="L647" class="LineNr">647 </span>  out &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
 <span id="L648" class="LineNr">648 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L649" class="LineNr">649 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
-<span id="L650" class="LineNr">650 </span>    out &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L649" class="LineNr">649 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
+<span id="L650" class="LineNr">650 </span>  <span class="Conceal">¦</span> out &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L651" class="LineNr">651 </span>  <span class="Delimiter">}</span>
 <span id="L652" class="LineNr">652 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L653" class="LineNr">653 </span><span class="Delimiter">}</span>
@@ -720,8 +721,8 @@ if ('onhashchange' in window) {
 <span id="L658" class="LineNr">658 </span>  out &lt;&lt; <span class="Constant">&quot;{&quot;</span><span class="Delimiter">;</span>
 <span id="L659" class="LineNr">659 </span>  out &lt;&lt; r<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L660" class="LineNr">660 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L661" class="LineNr">661 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L662" class="LineNr">662 </span>      out &lt;&lt; <span class="Constant">&quot;, </span><span class="cSpecial">\&quot;</span><span class="Constant">&quot;</span> &lt;&lt; r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">);</span>
+<span id="L661" class="LineNr">661 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L662" class="LineNr">662 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;, </span><span class="cSpecial">\&quot;</span><span class="Constant">&quot;</span> &lt;&lt; r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">);</span>
 <span id="L663" class="LineNr">663 </span>  <span class="Delimiter">}</span>
 <span id="L664" class="LineNr">664 </span>  out &lt;&lt; <span class="Constant">&quot;}&quot;</span><span class="Delimiter">;</span>
 <span id="L665" class="LineNr">665 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
@@ -748,20 +749,20 @@ if ('onhashchange' in window) {
 <span id="L686" class="LineNr">686 </span><span class="Normal">void</span> dump<span class="Delimiter">(</span><span class="Normal">const</span> string_tree* x<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L687" class="LineNr">687 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L688" class="LineNr">688 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L689" class="LineNr">689 </span>    out &lt;&lt; <span class="Constant">'&quot;'</span> &lt;&lt; x<span class="Delimiter">-&gt;</span>value &lt;&lt; <span class="Constant">'&quot;'</span><span class="Delimiter">;</span>
-<span id="L690" class="LineNr">690 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L689" class="LineNr">689 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">'&quot;'</span> &lt;&lt; x<span class="Delimiter">-&gt;</span>value &lt;&lt; <span class="Constant">'&quot;'</span><span class="Delimiter">;</span>
+<span id="L690" class="LineNr">690 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L691" class="LineNr">691 </span>  <span class="Delimiter">}</span>
 <span id="L692" class="LineNr">692 </span>  out &lt;&lt; <span class="Constant">'('</span><span class="Delimiter">;</span>
 <span id="L693" class="LineNr">693 </span>  <span class="Normal">const</span> string_tree* curr = x<span class="Delimiter">;</span>
 <span id="L694" class="LineNr">694 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr &amp;&amp; !curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L695" class="LineNr">695 </span>    dump<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L696" class="LineNr">696 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L697" class="LineNr">697 </span>    curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L695" class="LineNr">695 </span>  <span class="Conceal">¦</span> dump<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L696" class="LineNr">696 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L697" class="LineNr">697 </span>  <span class="Conceal">¦</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L698" class="LineNr">698 </span>  <span class="Delimiter">}</span>
 <span id="L699" class="LineNr">699 </span>  <span class="Comment">// check for dotted list; should never happen</span>
 <span id="L700" class="LineNr">700 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L701" class="LineNr">701 </span>    out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
-<span id="L702" class="LineNr">702 </span>    dump<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L701" class="LineNr">701 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
+<span id="L702" class="LineNr">702 </span>  <span class="Conceal">¦</span> dump<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
 <span id="L703" class="LineNr">703 </span>  <span class="Delimiter">}</span>
 <span id="L704" class="LineNr">704 </span>  out &lt;&lt; <span class="Constant">')'</span><span class="Delimiter">;</span>
 <span id="L705" class="LineNr">705 </span><span class="Delimiter">}</span>
@@ -777,29 +778,29 @@ if ('onhashchange' in window) {
 <span id="L715" class="LineNr">715 </span><span class="Normal">void</span> dump<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* x<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L716" class="LineNr">716 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L717" class="LineNr">717 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L718" class="LineNr">718 </span>    dump<span class="Delimiter">(</span>x<span class="Delimiter">-&gt;</span>value<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L719" class="LineNr">719 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L718" class="LineNr">718 </span>  <span class="Conceal">¦</span> dump<span class="Delimiter">(</span>x<span class="Delimiter">-&gt;</span>value<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L719" class="LineNr">719 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L720" class="LineNr">720 </span>  <span class="Delimiter">}</span>
 <span id="L721" class="LineNr">721 </span>  out &lt;&lt; <span class="Constant">'('</span><span class="Delimiter">;</span>
 <span id="L722" class="LineNr">722 </span>  <span class="Normal">const</span> type_tree* curr = x<span class="Delimiter">;</span>
 <span id="L723" class="LineNr">723 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr &amp;&amp; !curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L724" class="LineNr">724 </span>    dump<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L725" class="LineNr">725 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L726" class="LineNr">726 </span>    curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L724" class="LineNr">724 </span>  <span class="Conceal">¦</span> dump<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L725" class="LineNr">725 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L726" class="LineNr">726 </span>  <span class="Conceal">¦</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L727" class="LineNr">727 </span>  <span class="Delimiter">}</span>
 <span id="L728" class="LineNr">728 </span>  <span class="Comment">// check for dotted list; should never happen</span>
 <span id="L729" class="LineNr">729 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L730" class="LineNr">730 </span>    out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
-<span id="L731" class="LineNr">731 </span>    dump<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L730" class="LineNr">730 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
+<span id="L731" class="LineNr">731 </span>  <span class="Conceal">¦</span> dump<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
 <span id="L732" class="LineNr">732 </span>  <span class="Delimiter">}</span>
 <span id="L733" class="LineNr">733 </span>  out &lt;&lt; <span class="Constant">')'</span><span class="Delimiter">;</span>
 <span id="L734" class="LineNr">734 </span><span class="Delimiter">}</span>
 <span id="L735" class="LineNr">735 </span>
 <span id="L736" class="LineNr">736 </span><span class="Normal">void</span> dump<span class="Delimiter">(</span><a href='010vm.cc.html#L123'>type_ordinal</a> type<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L737" class="LineNr">737 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">))</span>
-<span id="L738" class="LineNr">738 </span>    out &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
+<span id="L738" class="LineNr">738 </span>  <span class="Conceal">¦</span> out &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
 <span id="L739" class="LineNr">739 </span>  <span class="Normal">else</span>
-<span id="L740" class="LineNr">740 </span>    out &lt;&lt; <span class="Constant">&quot;?&quot;</span> &lt;&lt; type<span class="Delimiter">;</span>
+<span id="L740" class="LineNr">740 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;?&quot;</span> &lt;&lt; type<span class="Delimiter">;</span>
 <span id="L741" class="LineNr">741 </span><span class="Delimiter">}</span>
 <span id="L742" class="LineNr">742 </span>
 <span id="L743" class="LineNr">743 </span>string names_to_string<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -813,20 +814,20 @@ if ('onhashchange' in window) {
 <span id="L751" class="LineNr">751 </span><span class="Normal">void</span> dump_names<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* x<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L752" class="LineNr">752 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L753" class="LineNr">753 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L754" class="LineNr">754 </span>    out &lt;&lt; <span class="Constant">'&quot;'</span> &lt;&lt; x<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">'&quot;'</span><span class="Delimiter">;</span>
-<span id="L755" class="LineNr">755 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L754" class="LineNr">754 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">'&quot;'</span> &lt;&lt; x<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">'&quot;'</span><span class="Delimiter">;</span>
+<span id="L755" class="LineNr">755 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L756" class="LineNr">756 </span>  <span class="Delimiter">}</span>
 <span id="L757" class="LineNr">757 </span>  out &lt;&lt; <span class="Constant">'('</span><span class="Delimiter">;</span>
 <span id="L758" class="LineNr">758 </span>  <span class="Normal">const</span> type_tree* curr = x<span class="Delimiter">;</span>
 <span id="L759" class="LineNr">759 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr &amp;&amp; !curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L760" class="LineNr">760 </span>    dump_names<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L761" class="LineNr">761 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L762" class="LineNr">762 </span>    curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L760" class="LineNr">760 </span>  <span class="Conceal">¦</span> dump_names<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L761" class="LineNr">761 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L762" class="LineNr">762 </span>  <span class="Conceal">¦</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L763" class="LineNr">763 </span>  <span class="Delimiter">}</span>
 <span id="L764" class="LineNr">764 </span>  <span class="Comment">// check for dotted list; should never happen</span>
 <span id="L765" class="LineNr">765 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L766" class="LineNr">766 </span>    out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
-<span id="L767" class="LineNr">767 </span>    dump_names<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L766" class="LineNr">766 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
+<span id="L767" class="LineNr">767 </span>  <span class="Conceal">¦</span> dump_names<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
 <span id="L768" class="LineNr">768 </span>  <span class="Delimiter">}</span>
 <span id="L769" class="LineNr">769 </span>  out &lt;&lt; <span class="Constant">')'</span><span class="Delimiter">;</span>
 <span id="L770" class="LineNr">770 </span><span class="Delimiter">}</span>
@@ -842,20 +843,20 @@ if ('onhashchange' in window) {
 <span id="L780" class="LineNr">780 </span><span class="Normal">void</span> dump_names_without_quotes<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* x<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L781" class="LineNr">781 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L782" class="LineNr">782 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L783" class="LineNr">783 </span>    out &lt;&lt; x<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
-<span id="L784" class="LineNr">784 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L783" class="LineNr">783 </span>  <span class="Conceal">¦</span> out &lt;&lt; x<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L784" class="LineNr">784 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L785" class="LineNr">785 </span>  <span class="Delimiter">}</span>
 <span id="L786" class="LineNr">786 </span>  out &lt;&lt; <span class="Constant">'('</span><span class="Delimiter">;</span>
 <span id="L787" class="LineNr">787 </span>  <span class="Normal">const</span> type_tree* curr = x<span class="Delimiter">;</span>
 <span id="L788" class="LineNr">788 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr &amp;&amp; !curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L789" class="LineNr">789 </span>    dump_names_without_quotes<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L790" class="LineNr">790 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L791" class="LineNr">791 </span>    curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L789" class="LineNr">789 </span>  <span class="Conceal">¦</span> dump_names_without_quotes<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L790" class="LineNr">790 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L791" class="LineNr">791 </span>  <span class="Conceal">¦</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L792" class="LineNr">792 </span>  <span class="Delimiter">}</span>
 <span id="L793" class="LineNr">793 </span>  <span class="Comment">// check for dotted list; should never happen</span>
 <span id="L794" class="LineNr">794 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L795" class="LineNr">795 </span>    out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
-<span id="L796" class="LineNr">796 </span>    dump_names_without_quotes<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L795" class="LineNr">795 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot;. &quot;</span><span class="Delimiter">;</span>
+<span id="L796" class="LineNr">796 </span>  <span class="Conceal">¦</span> dump_names_without_quotes<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
 <span id="L797" class="LineNr">797 </span>  <span class="Delimiter">}</span>
 <span id="L798" class="LineNr">798 </span>  out &lt;&lt; <span class="Constant">')'</span><span class="Delimiter">;</span>
 <span id="L799" class="LineNr">799 </span><span class="Delimiter">}</span>
@@ -871,9 +872,9 @@ if ('onhashchange' in window) {
 <span id="L809" class="LineNr">809 </span><span class="Delimiter">:(code)</span>
 <span id="L810" class="LineNr">810 </span>ostream&amp; <span class="Normal">operator</span>&lt;&lt;<span class="Delimiter">(</span>ostream&amp; os<span class="Delimiter">,</span> no_scientific x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L811" class="LineNr">811 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!isfinite<span class="Delimiter">(</span>x<span class="Delimiter">.</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L812" class="LineNr">812 </span>    <span class="Comment">// Infinity or NaN</span>
-<span id="L813" class="LineNr">813 </span>    os &lt;&lt; x<span class="Delimiter">.</span>x<span class="Delimiter">;</span>
-<span id="L814" class="LineNr">814 </span>    <span class="Identifier">return</span> os<span class="Delimiter">;</span>
+<span id="L812" class="LineNr">812 </span>  <span class="Conceal">¦</span> <span class="Comment">// Infinity or NaN</span>
+<span id="L813" class="LineNr">813 </span>  <span class="Conceal">¦</span> os &lt;&lt; x<span class="Delimiter">.</span>x<span class="Delimiter">;</span>
+<span id="L814" class="LineNr">814 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> os<span class="Delimiter">;</span>
 <span id="L815" class="LineNr">815 </span>  <span class="Delimiter">}</span>
 <span id="L816" class="LineNr">816 </span>  ostringstream tmp<span class="Delimiter">;</span>
 <span id="L817" class="LineNr">817 </span>  <span class="Comment">// more accurate, but too slow</span>
@@ -888,8 +889,8 @@ if ('onhashchange' in window) {
 <span id="L826" class="LineNr">826 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'.'</span><span class="Delimiter">)</span> == string::npos<span class="Delimiter">)</span> <span class="Identifier">return</span> in<span class="Delimiter">;</span>
 <span id="L827" class="LineNr">827 </span>  <span class="Normal">int</span> length = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L828" class="LineNr">828 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>length &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L829" class="LineNr">829 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>length-<span class="Constant">1</span><span class="Delimiter">)</span> != <span class="Constant">'0'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L830" class="LineNr">830 </span>    --length<span class="Delimiter">;</span>
+<span id="L829" class="LineNr">829 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>length-<span class="Constant">1</span><span class="Delimiter">)</span> != <span class="Constant">'0'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L830" class="LineNr">830 </span>  <span class="Conceal">¦</span> --length<span class="Delimiter">;</span>
 <span id="L831" class="LineNr">831 </span>  <span class="Delimiter">}</span>
 <span id="L832" class="LineNr">832 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>length-<span class="Constant">1</span><span class="Delimiter">)</span> == <span class="Constant">'.'</span><span class="Delimiter">)</span> --length<span class="Delimiter">;</span>
 <span id="L833" class="LineNr">833 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>length == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
diff --git a/html/011load.cc.html b/html/011load.cc.html
index 5aeeb12e..3c89e1a6 100644
--- a/html/011load.cc.html
+++ b/html/011load.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
+.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .traceAbsent { color: #c00000; }
 .Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -85,28 +86,28 @@ if ('onhashchange' in window) {
 <span id="L23" class="LineNr"> 23 </span>  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
 <span id="L24" class="LineNr"> 24 </span>  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L26" class="LineNr"> 26 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L28" class="LineNr"> 28 </span>    string command = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L29" class="LineNr"> 29 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>command<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L30" class="LineNr"> 30 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L31" class="LineNr"> 31 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L32" class="LineNr"> 32 </span>    <span class="Delimiter">}</span>
-<span id="L33" class="LineNr"> 33 </span>    <span class="Comment">// Command Handlers</span>
-<span id="L34" class="LineNr"> 34 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;recipe&quot;</span> || command == <span class="Constant">&quot;def&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L35" class="LineNr"> 35 </span>      <a href='010vm.cc.html#L14'>recipe_ordinal</a> r = <a href='011load.cc.html#L53'>slurp_recipe</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L36" class="LineNr"> 36 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>r &gt; <span class="Constant">0</span><span class="Delimiter">)</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="Delimiter">}</span>
-<span id="L38" class="LineNr"> 38 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;recipe!&quot;</span> || command == <span class="Constant">&quot;def!&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L39" class="LineNr"> 39 </span>      Disable_redefine_checks = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L40" class="LineNr"> 40 </span>      <a href='010vm.cc.html#L14'>recipe_ordinal</a> r = <a href='011load.cc.html#L53'>slurp_recipe</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L41" class="LineNr"> 41 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>r &gt; <span class="Constant">0</span><span class="Delimiter">)</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
-<span id="L42" class="LineNr"> 42 </span>      Disable_redefine_checks = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Delimiter">}</span>
-<span id="L44" class="LineNr"> 44 </span>    <span class="Comment">// End Command Handlers</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L46" class="LineNr"> 46 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unknown top-level command: &quot;</span> &lt;&lt; command &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L47" class="LineNr"> 47 </span>    <span class="Delimiter">}</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> string command = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Comment">// Command Handlers</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;recipe&quot;</span> || command == <span class="Constant">&quot;def&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r = <a href='011load.cc.html#L53'>slurp_recipe</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r &gt; <span class="Constant">0</span><span class="Delimiter">)</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;recipe!&quot;</span> || command == <span class="Constant">&quot;def!&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Disable_redefine_checks = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r = <a href='011load.cc.html#L53'>slurp_recipe</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r &gt; <span class="Constant">0</span><span class="Delimiter">)</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Disable_redefine_checks = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Command Handlers</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unknown top-level command: &quot;</span> &lt;&lt; command &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Delimiter">}</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L50" class="LineNr"> 50 </span><span class="Delimiter">}</span>
@@ -116,23 +117,23 @@ if ('onhashchange' in window) {
 <span id="L54" class="LineNr"> 54 </span>  <a href='010vm.cc.html#L19'>recipe</a> result<span class="Delimiter">;</span>
 <span id="L55" class="LineNr"> 55 </span>  result<span class="Delimiter">.</span>name = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L57" class="LineNr"> 57 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L58" class="LineNr"> 58 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;file ended with 'recipe'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L59" class="LineNr"> 59 </span>    <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;file ended with 'recipe'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Delimiter">}</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Comment">// End Load Recipe Name</span>
 <span id="L62" class="LineNr"> 62 </span>  skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Comment">// End Recipe Refinements</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L65" class="LineNr"> 65 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;empty result.name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;empty result.name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L66" class="LineNr"> 66 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- defining &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
-<span id="L68" class="LineNr"> 68 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
 <span id="L69" class="LineNr"> 69 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Recipe<span class="Delimiter">.</span>find<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span> != Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L70" class="LineNr"> 70 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;already exists&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='011load.cc.html#L378'>should_check_for_redefine</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
-<span id="L72" class="LineNr"> 72 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;redefining <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L73" class="LineNr"> 73 </span>    Recipe<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;already exists&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='011load.cc.html#L378'>should_check_for_redefine</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;redefining <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> Recipe<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
 <span id="L74" class="LineNr"> 74 </span>  <span class="Delimiter">}</span>
 <span id="L75" class="LineNr"> 75 </span>  <a href='011load.cc.html#L81'>slurp_body</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> result<span class="Delimiter">);</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Comment">// End Recipe Body(result)</span>
@@ -144,14 +145,14 @@ if ('onhashchange' in window) {
 <span id="L82" class="LineNr"> 82 </span>  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
 <span id="L83" class="LineNr"> 83 </span>  skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
-<span id="L85" class="LineNr"> 85 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: <a href='010vm.cc.html#L19'>recipe</a> body must begin with '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: <a href='010vm.cc.html#L19'>recipe</a> body must begin with '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L86" class="LineNr"> 86 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>  <span class="Comment">// permit trailing comment after '['</span>
 <span id="L87" class="LineNr"> 87 </span>  <a href='010vm.cc.html#L32'>instruction</a> curr<span class="Delimiter">;</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='011load.cc.html#L96'>next_instruction</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> &amp;curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>    curr<span class="Delimiter">.</span>original_string = to_original_string<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
-<span id="L90" class="LineNr"> 90 </span>    <span class="Comment">// End Rewrite Instruction(curr, recipe result)</span>
-<span id="L91" class="LineNr"> 91 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;after rewriting: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>curr<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L92" class="LineNr"> 92 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>is_empty<span class="Delimiter">())</span> result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>original_string = to_original_string<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Rewrite Instruction(curr, recipe result)</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;after rewriting: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>curr<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>is_empty<span class="Delimiter">())</span> result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
 <span id="L93" class="LineNr"> 93 </span>  <span class="Delimiter">}</span>
 <span id="L94" class="LineNr"> 94 </span><span class="Delimiter">}</span>
 <span id="L95" class="LineNr"> 95 </span>
@@ -159,67 +160,67 @@ if ('onhashchange' in window) {
 <span id="L97" class="LineNr"> 97 </span>  curr<span class="Delimiter">-&gt;</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L98" class="LineNr"> 98 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L99" class="LineNr"> 99 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L100" class="LineNr">100 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>
 <span id="L104" class="LineNr">104 </span>  vector&lt;string&gt; words<span class="Delimiter">;</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L106" class="LineNr">106 </span>    skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L107" class="LineNr">107 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L108" class="LineNr">108 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L109" class="LineNr">109 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L110" class="LineNr">110 </span>    <span class="Delimiter">}</span>
-<span id="L111" class="LineNr">111 </span>    string word = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L112" class="LineNr">112 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>word<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L113" class="LineNr">113 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L114" class="LineNr">114 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L115" class="LineNr">115 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L116" class="LineNr">116 </span>    <span class="Delimiter">}</span>
-<span id="L117" class="LineNr">117 </span>    words<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>word<span class="Delimiter">);</span>
-<span id="L118" class="LineNr">118 </span>    skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> string word = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>word<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> words<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>word<span class="Delimiter">);</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L119" class="LineNr">119 </span>  <span class="Delimiter">}</span>
 <span id="L120" class="LineNr">120 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>words<span class="Delimiter">)</span> == <span class="Constant">1</span> &amp;&amp; words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span>
-<span id="L122" class="LineNr">122 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// end of recipe</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// end of recipe</span>
 <span id="L123" class="LineNr">123 </span>
 <span id="L124" class="LineNr">124 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>words<span class="Delimiter">)</span> == <span class="Constant">1</span> &amp;&amp; <a href='011load.cc.html#L179'>is_label_word</a><span class="Delimiter">(</span>words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L125" class="LineNr">125 </span>    curr<span class="Delimiter">-&gt;</span>is_label = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L126" class="LineNr">126 </span>    curr<span class="Delimiter">-&gt;</span>label = words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L127" class="LineNr">127 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;label: &quot;</span> &lt;&lt; curr<span class="Delimiter">-&gt;</span>label &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L128" class="LineNr">128 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L129" class="LineNr">129 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (3)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L130" class="LineNr">130 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L131" class="LineNr">131 </span>    <span class="Delimiter">}</span>
-<span id="L132" class="LineNr">132 </span>    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">-&gt;</span>is_label = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">-&gt;</span>label = words<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;label: &quot;</span> &lt;&lt; curr<span class="Delimiter">-&gt;</span>label &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> at <a href='003trace.cc.html#L185'>end</a> of file (3)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L133" class="LineNr">133 </span>  <span class="Delimiter">}</span>
 <span id="L134" class="LineNr">134 </span>
 <span id="L135" class="LineNr">135 </span>  vector&lt;string&gt;::iterator p = words<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>find<span class="Delimiter">(</span>words<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> words<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">)</span> != words<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L137" class="LineNr">137 </span>    <span class="Normal">for</span> <span class="Delimiter">(;</span>  *p != <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">;</span>  ++p<span class="Delimiter">)</span>
-<span id="L138" class="LineNr">138 </span>      curr<span class="Delimiter">-&gt;</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
-<span id="L139" class="LineNr">139 </span>    ++p<span class="Delimiter">;</span>  <span class="Comment">// skip &lt;-</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(;</span>  *p != <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">;</span>  ++p<span class="Delimiter">)</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr<span class="Delimiter">-&gt;</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> ++p<span class="Delimiter">;</span>  <span class="Comment">// skip &lt;-</span>
 <span id="L140" class="LineNr">140 </span>  <span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>
 <span id="L142" class="LineNr">142 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>p == words<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L143" class="LineNr">143 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;instruction prematurely ended with '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L144" class="LineNr">144 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;instruction prematurely ended with '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Delimiter">}</span>
 <span id="L146" class="LineNr">146 </span>  curr<span class="Delimiter">-&gt;</span>name = *p<span class="Delimiter">;</span>  ++p<span class="Delimiter">;</span>
 <span id="L147" class="LineNr">147 </span>  <span class="Comment">// curr-&gt;operation will be set at transform time</span>
 <span id="L148" class="LineNr">148 </span>
 <span id="L149" class="LineNr">149 </span>  <span class="Normal">for</span> <span class="Delimiter">(;</span>  p != words<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L150" class="LineNr">150 </span>    curr<span class="Delimiter">-&gt;</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">-&gt;</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
 <span id="L151" class="LineNr">151 </span>
 <span id="L152" class="LineNr">152 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction: &quot;</span> &lt;&lt; curr<span class="Delimiter">-&gt;</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L153" class="LineNr">153 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  number of ingredients: &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>ingredients<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L154" class="LineNr">154 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;reagent&gt;::iterator p = curr<span class="Delimiter">-&gt;</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != curr<span class="Delimiter">-&gt;</span>ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L155" class="LineNr">155 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  ingredient: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>*p<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  ingredient: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>*p<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L156" class="LineNr">156 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;reagent&gt;::iterator p = curr<span class="Delimiter">-&gt;</span>products<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != curr<span class="Delimiter">-&gt;</span>products<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L157" class="LineNr">157 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  product: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>*p<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  product: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>*p<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L158" class="LineNr">158 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L159" class="LineNr">159 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;9: unbalanced '[' for <a href='010vm.cc.html#L19'>recipe</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L160" class="LineNr">160 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;9: unbalanced '[' for <a href='010vm.cc.html#L19'>recipe</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L161" class="LineNr">161 </span>  <span class="Delimiter">}</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Comment">// End next_instruction(curr)</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
@@ -234,7 +235,7 @@ if ('onhashchange' in window) {
 <span id="L172" class="LineNr">172 </span>  <a href='011load.cc.html#L220'>skip_whitespace_and_comments_but_not_newline</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L173" class="LineNr">173 </span>  string result = out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result != <span class="Constant">&quot;[&quot;</span> &amp;&amp; <a href='011load.cc.html#L184'>ends_with</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">'['</span><span class="Delimiter">))</span>
-<span id="L175" class="LineNr">175 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;insert a space before '[' in '&quot;</span> &lt;&lt; result &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;insert a space before '[' in '&quot;</span> &lt;&lt; result &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L177" class="LineNr">177 </span><span class="Delimiter">}</span>
 <span id="L178" class="LineNr">178 </span>
@@ -255,45 +256,45 @@ if ('onhashchange' in window) {
 <span id="L193" class="LineNr">193 </span><span class="Normal">void</span> <a href='011load.cc.html#L193'>slurp_word</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Normal">char</span> c<span class="Delimiter">;</span>
 <span id="L195" class="LineNr">195 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; Terminators<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L196" class="LineNr">196 </span>    in &gt;&gt; c<span class="Delimiter">;</span>
-<span id="L197" class="LineNr">197 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L198" class="LineNr">198 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> in &gt;&gt; c<span class="Delimiter">;</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L199" class="LineNr">199 </span>  <span class="Delimiter">}</span>
 <span id="L200" class="LineNr">200 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L201" class="LineNr">201 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>c<span class="Delimiter">)</span> || Terminators<span class="Delimiter">.</span>find<span class="Delimiter">(</span>c<span class="Delimiter">)</span> != string::npos || Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>c<span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L202" class="LineNr">202 </span>      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
-<span id="L203" class="LineNr">203 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L204" class="LineNr">204 </span>    <span class="Delimiter">}</span>
-<span id="L205" class="LineNr">205 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>c<span class="Delimiter">)</span> || Terminators<span class="Delimiter">.</span>find<span class="Delimiter">(</span>c<span class="Delimiter">)</span> != string::npos || Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>c<span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
 <span id="L206" class="LineNr">206 </span>  <span class="Delimiter">}</span>
 <span id="L207" class="LineNr">207 </span><span class="Delimiter">}</span>
 <span id="L208" class="LineNr">208 </span>
 <span id="L209" class="LineNr">209 </span><span class="Normal">void</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L210" class="LineNr">210 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L211" class="LineNr">211 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L212" class="LineNr">212 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L213" class="LineNr">213 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L214" class="LineNr">214 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <a href='011load.cc.html#L231'>skip_comment</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L215" class="LineNr">215 </span>    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <a href='011load.cc.html#L231'>skip_comment</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L216" class="LineNr">216 </span>  <span class="Delimiter">}</span>
 <span id="L217" class="LineNr">217 </span><span class="Delimiter">}</span>
 <span id="L218" class="LineNr">218 </span>
 <span id="L219" class="LineNr">219 </span><span class="Comment">// confusing; move to the next line only to skip a comment, but never otherwise</span>
 <span id="L220" class="LineNr">220 </span><span class="Normal">void</span> <a href='011load.cc.html#L220'>skip_whitespace_and_comments_but_not_newline</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L222" class="LineNr">222 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L223" class="LineNr">223 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L224" class="LineNr">224 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L225" class="LineNr">225 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L226" class="LineNr">226 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <a href='011load.cc.html#L231'>skip_comment</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L227" class="LineNr">227 </span>    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L225" class="LineNr">225 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Ignore<span class="Delimiter">.</span>find<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> != string::npos<span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <a href='011load.cc.html#L231'>skip_comment</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L228" class="LineNr">228 </span>  <span class="Delimiter">}</span>
 <span id="L229" class="LineNr">229 </span><span class="Delimiter">}</span>
 <span id="L230" class="LineNr">230 </span>
 <span id="L231" class="LineNr">231 </span><span class="Normal">void</span> <a href='011load.cc.html#L231'>skip_comment</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L232" class="LineNr">232 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L233" class="LineNr">233 </span>    in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L234" class="LineNr">234 </span>    <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
 <span id="L235" class="LineNr">235 </span>  <span class="Delimiter">}</span>
 <span id="L236" class="LineNr">236 </span><span class="Delimiter">}</span>
 <span id="L237" class="LineNr">237 </span>
@@ -416,9 +417,9 @@ if ('onhashchange' in window) {
 <span id="L354" class="LineNr">354 </span><span class="Delimiter">:(code)</span>
 <span id="L355" class="LineNr">355 </span><span class="Normal">void</span> <a href='011load.cc.html#L355'>test_parse_comment_terminated_by_eof</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L356" class="LineNr">356 </span>  load<span class="Delimiter">(</span><span class="Constant">&quot;recipe <a href='000organization.cc.html#L113'>main</a> [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L357" class="LineNr">357 </span>       <span class="Constant">&quot;  a:number &lt;- copy 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L358" class="LineNr">358 </span>       <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L359" class="LineNr">359 </span>       <span class="Constant">&quot;# abc&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// no newline after comment</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;  a:number &lt;- copy 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;# abc&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// no newline after comment</span>
 <span id="L360" class="LineNr">360 </span>  cerr &lt;&lt; <span class="Constant">&quot;.&quot;</span><span class="Delimiter">;</span>  <span class="Comment">// termination = success</span>
 <span id="L361" class="LineNr">361 </span><span class="Delimiter">}</span>
 <span id="L362" class="LineNr">362 </span>
@@ -468,7 +469,7 @@ if ('onhashchange' in window) {
 <span id="L406" class="LineNr">406 </span>  cerr &lt;&lt; <span class="Constant">'^'</span><span class="Delimiter">;</span>
 <span id="L407" class="LineNr">407 </span>  <span class="Normal">char</span> c<span class="Delimiter">;</span>
 <span id="L408" class="LineNr">408 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span>
-<span id="L409" class="LineNr">409 </span>    cerr &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; c<span class="Delimiter">;</span>
 <span id="L410" class="LineNr">410 </span>  cerr &lt;&lt; <span class="Constant">&quot;$</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L411" class="LineNr">411 </span>  exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L412" class="LineNr">412 </span><span class="Delimiter">}</span>
diff --git a/html/012transform.cc.html b/html/012transform.cc.html
index 6323c53f..708abaaa 100644
--- a/html/012transform.cc.html
+++ b/html/012transform.cc.html
@@ -16,6 +16,7 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
@@ -89,11 +90,11 @@ if ('onhashchange' in window) {
 <span id="L32" class="LineNr"> 32 </span><span class="Delimiter">:(code)</span>
 <span id="L33" class="LineNr"> 33 </span><span class="Normal">void</span> <a href='012transform.cc.html#L33'>initialize_transforms</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Comment">// Begin Transforms</span>
-<span id="L35" class="LineNr"> 35 </span>    <span class="Comment">// Begin Instruction Inserting/Deleting Transforms</span>
-<span id="L36" class="LineNr"> 36 </span>    <span class="Comment">// End Instruction Inserting/Deleting Transforms</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Comment">// Begin Instruction Inserting/Deleting Transforms</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Instruction Inserting/Deleting Transforms</span>
 <span id="L37" class="LineNr"> 37 </span>
-<span id="L38" class="LineNr"> 38 </span>    <span class="Comment">// Begin Instruction Modifying Transforms</span>
-<span id="L39" class="LineNr"> 39 </span>    <span class="Comment">// End Instruction Modifying Transforms</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Comment">// Begin Instruction Modifying Transforms</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Instruction Modifying Transforms</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Comment">// End Transforms</span>
 <span id="L41" class="LineNr"> 41 </span>
 <span id="L42" class="LineNr"> 42 </span>  <span class="Comment">// Begin Checks</span>
@@ -102,60 +103,61 @@ if ('onhashchange' in window) {
 <span id="L45" class="LineNr"> 45 </span>
 <span id="L46" class="LineNr"> 46 </span><span class="Normal">void</span> <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L47" class="LineNr"> 47 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;=== transform_all()&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L48" class="LineNr"> 48 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span>  t &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Transform<span class="Delimiter">);</span>  ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L49" class="LineNr"> 49 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L50" class="LineNr"> 50 </span>      recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
-<span id="L51" class="LineNr"> 51 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>transformed_until != t-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L52" class="LineNr"> 52 </span>      <span class="Comment">// End Transform Checks</span>
-<span id="L53" class="LineNr"> 53 </span>      <span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span><span class="Comment">/*</span><span class="Comment"><a href='010vm.cc.html#L14'>recipe_ordinal</a></span><span class="Comment">*/</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">);</span>
-<span id="L54" class="LineNr"> 54 </span>      r<span class="Delimiter">.</span>transformed_until = t<span class="Delimiter">;</span>
-<span id="L55" class="LineNr"> 55 </span>    <span class="Delimiter">}</span>
-<span id="L56" class="LineNr"> 56 </span>  <span class="Delimiter">}</span>
-<span id="L57" class="LineNr"> 57 </span>  <a href='012transform.cc.html#L73'>parse_int_reagents</a><span class="Delimiter">();</span>  <span class="Comment">// do this after all other transforms have run</span>
-<span id="L58" class="LineNr"> 58 </span>  <span class="Comment">// End transform_all</span>
-<span id="L59" class="LineNr"> 59 </span><span class="Delimiter">}</span>
-<span id="L60" class="LineNr"> 60 </span>
-<span id="L61" class="LineNr"> 61 </span><span class="Comment">//: Even though a run will involve many calls to transform_all() for tests,</span>
-<span id="L62" class="LineNr"> 62 </span><span class="Comment">//: our logical model is to load all code, then transform all code, then run.</span>
-<span id="L63" class="LineNr"> 63 </span><span class="Comment">//: If you load new code that should cause already-transformed recipes to</span>
-<span id="L64" class="LineNr"> 64 </span><span class="Comment">//: change, that's not supported. To help detect such situations and raise</span>
-<span id="L65" class="LineNr"> 65 </span><span class="Comment">//: helpful errors we track a count of the number of calls made to</span>
-<span id="L66" class="LineNr"> 66 </span><span class="Comment">//: transform_all().</span>
-<span id="L67" class="LineNr"> 67 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
-<span id="L68" class="LineNr"> 68 </span><span class="Normal">int</span> Num_calls_to_transform_all = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L69" class="LineNr"> 69 </span><span class="Delimiter">:(after &quot;void transform_all()&quot;)</span>
-<span id="L70" class="LineNr"> 70 </span>  ++Num_calls_to_transform_all<span class="Delimiter">;</span>
-<span id="L71" class="LineNr"> 71 </span>
-<span id="L72" class="LineNr"> 72 </span><span class="Delimiter">:(code)</span>
-<span id="L73" class="LineNr"> 73 </span><span class="Normal">void</span> <a href='012transform.cc.html#L73'>parse_int_reagents</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L74" class="LineNr"> 74 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- parsing any uninitialized reagents as integers&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L75" class="LineNr"> 75 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L76" class="LineNr"> 76 </span>    recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
-<span id="L77" class="LineNr"> 77 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L78" class="LineNr"> 78 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L79" class="LineNr"> 79 </span>      instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L80" class="LineNr"> 80 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L81" class="LineNr"> 81 </span>        <a href='012transform.cc.html#L90'>populate_value</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L82" class="LineNr"> 82 </span>      <span class="Delimiter">}</span>
-<span id="L83" class="LineNr"> 83 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L84" class="LineNr"> 84 </span>        <a href='012transform.cc.html#L90'>populate_value</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L85" class="LineNr"> 85 </span>      <span class="Delimiter">}</span>
-<span id="L86" class="LineNr"> 86 </span>    <span class="Delimiter">}</span>
-<span id="L87" class="LineNr"> 87 </span>  <span class="Delimiter">}</span>
-<span id="L88" class="LineNr"> 88 </span><span class="Delimiter">}</span>
-<span id="L89" class="LineNr"> 89 </span>
-<span id="L90" class="LineNr"> 90 </span><span class="Normal">void</span> <a href='012transform.cc.html#L90'>populate_value</a><span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L91" class="LineNr"> 91 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L92" class="LineNr"> 92 </span>  <span class="Comment">// End Reagent-parsing Exceptions</span>
-<span id="L93" class="LineNr"> 93 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L94" class="LineNr"> 94 </span>  r<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
-<span id="L95" class="LineNr"> 95 </span><span class="Delimiter">}</span>
-<span id="L96" class="LineNr"> 96 </span>
-<span id="L97" class="LineNr"> 97 </span><span class="Comment">// helper for tests -- temporarily suppress run</span>
-<span id="L98" class="LineNr"> 98 </span><span class="Normal">void</span> <a href='012transform.cc.html#L98'>transform</a><span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L99" class="LineNr"> 99 </span>  load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
-<span id="L100" class="LineNr">100 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
-<span id="L101" class="LineNr">101 </span><span class="Delimiter">}</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Comment">// Begin transform_all</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span>  t &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Transform<span class="Delimiter">);</span>  ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>transformed_until != t-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Transform Checks</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span><span class="Comment">/*</span><span class="Comment"><a href='010vm.cc.html#L14'>recipe_ordinal</a></span><span class="Comment">*/</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">);</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> r<span class="Delimiter">.</span>transformed_until = t<span class="Delimiter">;</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Delimiter">}</span>
+<span id="L58" class="LineNr"> 58 </span>  <a href='012transform.cc.html#L74'>parse_int_reagents</a><span class="Delimiter">();</span>  <span class="Comment">// do this after all other transforms have run</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Comment">// End transform_all</span>
+<span id="L60" class="LineNr"> 60 </span><span class="Delimiter">}</span>
+<span id="L61" class="LineNr"> 61 </span>
+<span id="L62" class="LineNr"> 62 </span><span class="Comment">//: Even though a run will involve many calls to transform_all() for tests,</span>
+<span id="L63" class="LineNr"> 63 </span><span class="Comment">//: our logical model is to load all code, then transform all code, then run.</span>
+<span id="L64" class="LineNr"> 64 </span><span class="Comment">//: If you load new code that should cause already-transformed recipes to</span>
+<span id="L65" class="LineNr"> 65 </span><span class="Comment">//: change, that's not supported. To help detect such situations and raise</span>
+<span id="L66" class="LineNr"> 66 </span><span class="Comment">//: helpful errors we track a count of the number of calls made to</span>
+<span id="L67" class="LineNr"> 67 </span><span class="Comment">//: transform_all().</span>
+<span id="L68" class="LineNr"> 68 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
+<span id="L69" class="LineNr"> 69 </span><span class="Normal">int</span> Num_calls_to_transform_all = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L70" class="LineNr"> 70 </span><span class="Delimiter">:(after &quot;void transform_all()&quot;)</span>
+<span id="L71" class="LineNr"> 71 </span>  ++Num_calls_to_transform_all<span class="Delimiter">;</span>
+<span id="L72" class="LineNr"> 72 </span>
+<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">:(code)</span>
+<span id="L74" class="LineNr"> 74 </span><span class="Normal">void</span> <a href='012transform.cc.html#L74'>parse_int_reagents</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L75" class="LineNr"> 75 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- parsing any uninitialized reagents as integers&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Delimiter">}</span>
+<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">}</span>
+<span id="L90" class="LineNr"> 90 </span>
+<span id="L91" class="LineNr"> 91 </span><span class="Normal">void</span> <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Comment">// End Reagent-parsing Exceptions</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L95" class="LineNr"> 95 </span>  r<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
+<span id="L96" class="LineNr"> 96 </span><span class="Delimiter">}</span>
+<span id="L97" class="LineNr"> 97 </span>
+<span id="L98" class="LineNr"> 98 </span><span class="Comment">// helper for tests -- temporarily suppress run</span>
+<span id="L99" class="LineNr"> 99 </span><span class="Normal">void</span> <a href='012transform.cc.html#L99'>transform</a><span class="Delimiter">(</span>string form<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L100" class="LineNr">100 </span>  load<span class="Delimiter">(</span>form<span class="Delimiter">);</span>
+<span id="L101" class="LineNr">101 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
+<span id="L102" class="LineNr">102 </span><span class="Delimiter">}</span>
 </pre>
 </body>
 </html>
diff --git a/html/013update_operation.cc.html b/html/013update_operation.cc.html
index 06afb9ae..42d3fb79 100644
--- a/html/013update_operation.cc.html
+++ b/html/013update_operation.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
-.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.traceContains { color: #008000; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .CommentedCode { color: #6c6c6c; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.muRecipe { color: #ff8700; }
 .Identifier { color: #c0a020; }
-.traceContains { color: #008000; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -72,14 +73,14 @@ if ('onhashchange' in window) {
 <span id="L10" class="LineNr">10 </span>  recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L11" class="LineNr">11 </span><span class="CommentedCode">//?   cerr &lt;&lt; &quot;--- compute instruction operations for recipe &quot; &lt;&lt; caller.name &lt;&lt; '\n';</span>
 <span id="L12" class="LineNr">12 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L13" class="LineNr">13 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L14" class="LineNr">14 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L15" class="LineNr">15 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L16" class="LineNr">16 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has no <a href='010vm.cc.html#L19'>recipe</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L17" class="LineNr">17 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L18" class="LineNr">18 </span>    <span class="Delimiter">}</span>
-<span id="L19" class="LineNr">19 </span>    inst<span class="Delimiter">.</span>operation = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
-<span id="L20" class="LineNr">20 </span>    <span class="Comment">// End Instruction Operation Checks</span>
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L14" class="LineNr">14 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L15" class="LineNr">15 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L16" class="LineNr">16 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has no <a href='010vm.cc.html#L19'>recipe</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L17" class="LineNr">17 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L18" class="LineNr">18 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L19" class="LineNr">19 </span>  <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>operation = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Instruction Operation Checks</span>
 <span id="L21" class="LineNr">21 </span>  <span class="Delimiter">}</span>
 <span id="L22" class="LineNr">22 </span><span class="Delimiter">}</span>
 <span id="L23" class="LineNr">23 </span>
diff --git a/html/014literal_string.cc.html b/html/014literal_string.cc.html
index 30b36230..189126ed 100644
--- a/html/014literal_string.cc.html
+++ b/html/014literal_string.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -95,9 +96,9 @@ if ('onhashchange' in window) {
 <span id="L34" class="LineNr"> 34 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L35" class="LineNr"> 35 </span>  assert<span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">));</span>  assert<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>  out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>  <span class="Comment">// slurp the '['</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L45'>is_code_string</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">))</span>
-<span id="L37" class="LineNr"> 37 </span>    <a href='014literal_string.cc.html#L82'>slurp_quoted_comment_aware</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <a href='014literal_string.cc.html#L82'>slurp_quoted_comment_aware</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Normal">else</span>
-<span id="L39" class="LineNr"> 39 </span>    <a href='014literal_string.cc.html#L62'>slurp_quoted_comment_oblivious</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <a href='014literal_string.cc.html#L62'>slurp_quoted_comment_oblivious</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L41" class="LineNr"> 41 </span><span class="Delimiter">}</span>
 <span id="L42" class="LineNr"> 42 </span>
@@ -105,15 +106,15 @@ if ('onhashchange' in window) {
 <span id="L44" class="LineNr"> 44 </span><span class="Comment">// brackets) if it contains a newline at the start before any non-whitespace.</span>
 <span id="L45" class="LineNr"> 45 </span><span class="Normal">bool</span> <a href='014literal_string.cc.html#L45'>is_code_string</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L46" class="LineNr"> 46 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L47" class="LineNr"> 47 </span>    <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L48" class="LineNr"> 48 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!isspace<span class="Delimiter">(</span>c<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L49" class="LineNr"> 49 </span>      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
-<span id="L50" class="LineNr"> 50 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L51" class="LineNr"> 51 </span>    <span class="Delimiter">}</span>
-<span id="L52" class="LineNr"> 52 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L53" class="LineNr"> 53 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L54" class="LineNr"> 54 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L55" class="LineNr"> 55 </span>    <span class="Delimiter">}</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!isspace<span class="Delimiter">(</span>c<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Delimiter">}</span>
 <span id="L57" class="LineNr"> 57 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L58" class="LineNr"> 58 </span><span class="Delimiter">}</span>
@@ -123,19 +124,19 @@ if ('onhashchange' in window) {
 <span id="L62" class="LineNr"> 62 </span><span class="Normal">void</span> <a href='014literal_string.cc.html#L62'>slurp_quoted_comment_oblivious</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Normal">int</span> brace_depth = <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L65" class="LineNr"> 65 </span>    <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L66" class="LineNr"> 66 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L67" class="LineNr"> 67 </span>      <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L68" class="LineNr"> 68 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L69" class="LineNr"> 69 </span>    <span class="Delimiter">}</span>
-<span id="L70" class="LineNr"> 70 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> ++brace_depth<span class="Delimiter">;</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> --brace_depth<span class="Delimiter">;</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>brace_depth == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> ++brace_depth<span class="Delimiter">;</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> --brace_depth<span class="Delimiter">;</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>brace_depth == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L74" class="LineNr"> 74 </span>  <span class="Delimiter">}</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; brace_depth &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L76" class="LineNr"> 76 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L77" class="LineNr"> 77 </span>    out<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> out<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">}</span>
 <span id="L79" class="LineNr"> 79 </span><span class="Delimiter">}</span>
 <span id="L80" class="LineNr"> 80 </span>
@@ -143,23 +144,23 @@ if ('onhashchange' in window) {
 <span id="L82" class="LineNr"> 82 </span><span class="Normal">void</span> <a href='014literal_string.cc.html#L82'>slurp_quoted_comment_aware</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Normal">char</span> c<span class="Delimiter">;</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L85" class="LineNr"> 85 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L86" class="LineNr"> 86 </span>      <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L87" class="LineNr"> 87 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L88" class="LineNr"> 88 </span>    <span class="Delimiter">}</span>
-<span id="L89" class="LineNr"> 89 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>      out &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L91" class="LineNr"> 91 </span>      <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
-<span id="L92" class="LineNr"> 92 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L93" class="LineNr"> 93 </span>    <span class="Delimiter">}</span>
-<span id="L94" class="LineNr"> 94 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
-<span id="L96" class="LineNr"> 96 </span>      <span class="Comment">// recurse</span>
-<span id="L97" class="LineNr"> 97 </span>      out &lt;&lt; <a href='014literal_string.cc.html#L33'>slurp_quoted</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L98" class="LineNr"> 98 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="Delimiter">}</span>
-<span id="L100" class="LineNr">100 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='014literal_string.cc.html#L148'>slurp_one_past_backslashes</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// recurse</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; <a href='014literal_string.cc.html#L33'>slurp_quoted</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L104" class="LineNr">104 </span>  out<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
@@ -181,7 +182,7 @@ if ('onhashchange' in window) {
 <span id="L120" class="LineNr">120 </span>
 <span id="L121" class="LineNr">121 </span><span class="Delimiter">:(after &quot;string to_string(const reagent&amp; r)&quot;)</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L123" class="LineNr">123 </span>    <span class="Identifier">return</span> <a href='014literal_string.cc.html#L130'>emit_literal_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='014literal_string.cc.html#L130'>emit_literal_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
 <span id="L124" class="LineNr">124 </span>
 <span id="L125" class="LineNr">125 </span><span class="Delimiter">:(code)</span>
 <span id="L126" class="LineNr">126 </span><span class="Normal">bool</span> <a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -191,14 +192,14 @@ if ('onhashchange' in window) {
 <span id="L130" class="LineNr">130 </span>string <a href='014literal_string.cc.html#L130'>emit_literal_string</a><span class="Delimiter">(</span>string name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L131" class="LineNr">131 </span>  <span class="Normal">size_t</span> pos = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L132" class="LineNr">132 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>pos != string::npos<span class="Delimiter">)</span>
-<span id="L133" class="LineNr">133 </span>    pos = <a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\\</span><span class="Constant">n&quot;</span><span class="Delimiter">,</span> pos<span class="Delimiter">);</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> pos = <a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\\</span><span class="Constant">n&quot;</span><span class="Delimiter">,</span> pos<span class="Delimiter">);</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Identifier">return</span> <span class="Constant">&quot;{</span><span class="cSpecial">\&quot;</span><span class="Constant">&quot;</span>+name+<span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">: </span><span class="cSpecial">\&quot;</span><span class="Constant">literal-string</span><span class="cSpecial">\&quot;</span><span class="Constant">}&quot;</span><span class="Delimiter">;</span>
 <span id="L135" class="LineNr">135 </span><span class="Delimiter">}</span>
 <span id="L136" class="LineNr">136 </span>
 <span id="L137" class="LineNr">137 </span><span class="Normal">size_t</span> <a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>string&amp; str<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; from<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; to<span class="Delimiter">,</span> <span class="Normal">size_t</span> n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Normal">size_t</span> result = str<span class="Delimiter">.</span>find<span class="Delimiter">(</span>from<span class="Delimiter">,</span> n<span class="Delimiter">);</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result != string::npos<span class="Delimiter">)</span>
-<span id="L140" class="LineNr">140 </span>    str<span class="Delimiter">.</span><a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> from<span class="Delimiter">.</span>length<span class="Delimiter">(),</span> to<span class="Delimiter">);</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> str<span class="Delimiter">.</span><a href='014literal_string.cc.html#L137'>replace</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> from<span class="Delimiter">.</span>length<span class="Delimiter">(),</span> to<span class="Delimiter">);</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L142" class="LineNr">142 </span><span class="Delimiter">}</span>
 <span id="L143" class="LineNr">143 </span>
@@ -222,9 +223,9 @@ if ('onhashchange' in window) {
 <span id="L161" class="LineNr">161 </span>  <span class="Comment">// backslashes both to escape quote characters and also as a notation for</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Comment">// unprintable characters like '\n'.</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>    <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L165" class="LineNr">165 </span>    out &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c != <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Normal">char</span> c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> out &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c != <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L167" class="LineNr">167 </span>  <span class="Delimiter">}</span>
 <span id="L168" class="LineNr">168 </span><span class="Delimiter">}</span>
 <span id="L169" class="LineNr">169 </span>
@@ -267,8 +268,8 @@ if ('onhashchange' in window) {
 <span id="L206" class="LineNr">206 </span><span class="Delimiter">:(scenario string_literal_can_skip_past_comments)</span>
 <span id="L207" class="LineNr">207 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L208" class="LineNr">208 </span>  copy [
-<span id="L209" class="LineNr">209 </span>    <span class="Comment"># ']' inside comment</span>
-<span id="L210" class="LineNr">210 </span>    bar
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Comment"># ']' inside comment</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> bar
 <span id="L211" class="LineNr">211 </span>  ]
 <span id="L212" class="LineNr">212 </span>]
 <span id="L213" class="LineNr">213 </span><span class="traceContains">+parse:   ingredient: {&quot;\n    # ']' inside comment\n    bar\n  &quot;: &quot;literal-string&quot;}</span>
diff --git a/html/015literal_noninteger.cc.html b/html/015literal_noninteger.cc.html
index 773772ee..6a0fc6a5 100644
--- a/html/015literal_noninteger.cc.html
+++ b/html/015literal_noninteger.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -79,9 +80,9 @@ if ('onhashchange' in window) {
 <span id="L18" class="LineNr">18 </span><span class="Delimiter">:(code)</span>
 <span id="L19" class="LineNr">19 </span><span class="Normal">bool</span> <a href='015literal_noninteger.cc.html#L19'>is_noninteger</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L20" class="LineNr">20 </span>  <span class="Identifier">return</span> s<span class="Delimiter">.</span>find_first_not_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789-.&quot;</span><span class="Delimiter">)</span> == string::npos  <span class="Comment">// no other characters</span>
-<span id="L21" class="LineNr">21 </span>      &amp;&amp; s<span class="Delimiter">.</span>find_first_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789&quot;</span><span class="Delimiter">)</span> != string::npos  <span class="Comment">// at least one digit</span>
-<span id="L22" class="LineNr">22 </span>      &amp;&amp; s<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'-'</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">)</span> == string::npos  <span class="Comment">// '-' only at first position</span>
-<span id="L23" class="LineNr">23 </span>      &amp;&amp; std::count<span class="Delimiter">(</span>s<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> s<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> <span class="Constant">'.'</span><span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// exactly one decimal point</span>
+<span id="L21" class="LineNr">21 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; s<span class="Delimiter">.</span>find_first_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789&quot;</span><span class="Delimiter">)</span> != string::npos  <span class="Comment">// at least one digit</span>
+<span id="L22" class="LineNr">22 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; s<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'-'</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">)</span> == string::npos  <span class="Comment">// '-' only at first position</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; std::count<span class="Delimiter">(</span>s<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> s<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> <span class="Constant">'.'</span><span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// exactly one decimal point</span>
 <span id="L24" class="LineNr">24 </span><span class="Delimiter">}</span>
 <span id="L25" class="LineNr">25 </span>
 <span id="L26" class="LineNr">26 </span><span class="Normal">double</span> <a href='015literal_noninteger.cc.html#L26'>to_double</a><span class="Delimiter">(</span>string n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
diff --git a/html/016dilated_reagent.cc.html b/html/016dilated_reagent.cc.html
index 2a7764cd..79c1c9d7 100644
--- a/html/016dilated_reagent.cc.html
+++ b/html/016dilated_reagent.cc.html
@@ -16,17 +16,18 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
 .cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
+.Identifier { color: #c0a020; }
 .Error { color: #ffffff; background-color: #ff6060; padding-bottom: 1px; }
 .PreProc { color: #800080; }
-.Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -122,33 +123,33 @@ if ('onhashchange' in window) {
 <span id="L59" class="LineNr"> 59 </span>  <span class="Normal">char</span> c<span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  list&lt;<span class="Normal">char</span>&gt; open_brackets<span class="Delimiter">;</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'('</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L64" class="LineNr"> 64 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L65" class="LineNr"> 65 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced ')'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L66" class="LineNr"> 66 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L67" class="LineNr"> 67 </span>      <span class="Delimiter">}</span>
-<span id="L68" class="LineNr"> 68 </span>      assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">);</span>
-<span id="L69" class="LineNr"> 69 </span>      open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>    <span class="Delimiter">}</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L73" class="LineNr"> 73 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L74" class="LineNr"> 74 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L75" class="LineNr"> 75 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L76" class="LineNr"> 76 </span>      <span class="Delimiter">}</span>
-<span id="L77" class="LineNr"> 77 </span>      open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
-<span id="L78" class="LineNr"> 78 </span>    <span class="Delimiter">}</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'{'</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
-<span id="L80" class="LineNr"> 80 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'}'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L81" class="LineNr"> 81 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'{'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L82" class="LineNr"> 82 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '}'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L83" class="LineNr"> 83 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L84" class="LineNr"> 84 </span>      <span class="Delimiter">}</span>
-<span id="L85" class="LineNr"> 85 </span>      open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
-<span id="L86" class="LineNr"> 86 </span>    <span class="Delimiter">}</span>
-<span id="L87" class="LineNr"> 87 </span>    result &lt;&lt; c<span class="Delimiter">;</span>
-<span id="L88" class="LineNr"> 88 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'('</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced ')'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">);</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'{'</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'}'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> != <span class="Constant">'{'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unbalanced '}'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> result &lt;&lt; c<span class="Delimiter">;</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L89" class="LineNr"> 89 </span>  <span class="Delimiter">}</span>
 <span id="L90" class="LineNr"> 90 </span>  <a href='011load.cc.html#L220'>skip_whitespace_and_comments_but_not_newline</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
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@@ -162,38 +163,38 @@ if ('onhashchange' in window) {
 <span id="L99" class="LineNr"> 99 </span>  in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip '{'</span>
 <span id="L100" class="LineNr">100 </span>  name = <a href='016dilated_reagent.cc.html#L139'>slurp_key</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
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-<span id="L102" class="LineNr">102 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid reagent '&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;' without a name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid reagent '&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;' without a name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Delimiter">}</span>
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-<span id="L106" class="LineNr">106 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid empty reagent '&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L107" class="LineNr">107 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid empty reagent '&quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L108" class="LineNr">108 </span>  <span class="Delimiter">}</span>
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-<span id="L110" class="LineNr">110 </span>    string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L111" class="LineNr">111 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L112" class="LineNr">112 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L113" class="LineNr">113 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete dilated reagent at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L114" class="LineNr">114 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Delimiter">}</span>
-<span id="L116" class="LineNr">116 </span>    string_tree* type_names = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
-<span id="L117" class="LineNr">117 </span>    <span class="Comment">// End Parsing Dilated Reagent Type Property(type_names)</span>
-<span id="L118" class="LineNr">118 </span>    type = <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>type_names<span class="Delimiter">);</span>
-<span id="L119" class="LineNr">119 </span>    <span class="Normal">delete</span> type_names<span class="Delimiter">;</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete dilated reagent at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> string_tree* type_names = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Parsing Dilated Reagent Type Property(type_names)</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> type = <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>type_names<span class="Delimiter">);</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> type_names<span class="Delimiter">;</span>
 <span id="L120" class="LineNr">120 </span>  <span class="Delimiter">}</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L122" class="LineNr">122 </span>    string key = <a href='016dilated_reagent.cc.html#L139'>slurp_key</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L123" class="LineNr">123 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L124" class="LineNr">124 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L125" class="LineNr">125 </span>    string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L126" class="LineNr">126 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L127" class="LineNr">127 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L128" class="LineNr">128 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete dilated reagent at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L129" class="LineNr">129 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L130" class="LineNr">130 </span>    <span class="Delimiter">}</span>
-<span id="L131" class="LineNr">131 </span>    string_tree* value = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
-<span id="L132" class="LineNr">132 </span>    <span class="Comment">// End Parsing Dilated Reagent Property(value)</span>
-<span id="L133" class="LineNr">133 </span>    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> string key = <a href='016dilated_reagent.cc.html#L139'>slurp_key</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete dilated reagent at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> string_tree* value = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Parsing Dilated Reagent Property(value)</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Delimiter">}</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L136" class="LineNr">136 </span><span class="Delimiter">}</span>
@@ -202,14 +203,14 @@ if ('onhashchange' in window) {
 <span id="L139" class="LineNr">139 </span>string <a href='016dilated_reagent.cc.html#L139'>slurp_key</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L140" class="LineNr">140 </span>  string result = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L142" class="LineNr">142 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L143" class="LineNr">143 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete dilated reagent at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L144" class="LineNr">144 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete dilated reagent at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Delimiter">}</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>!result<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; *result<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
-<span id="L147" class="LineNr">147 </span>    <a href='014literal_string.cc.html#L144'>strip_last</a><span class="Delimiter">(</span>result<span class="Delimiter">);</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <a href='014literal_string.cc.html#L144'>strip_last</a><span class="Delimiter">(</span>result<span class="Delimiter">);</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> || in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
-<span id="L149" class="LineNr">149 </span>    in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L151" class="LineNr">151 </span><span class="Delimiter">}</span>
 </pre>
diff --git a/html/017parse_tree.cc.html b/html/017parse_tree.cc.html
index 7ee73d4f..0a4630be 100644
--- a/html/017parse_tree.cc.html
+++ b/html/017parse_tree.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.muData { color: #ffff00; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -103,40 +104,40 @@ if ('onhashchange' in window) {
 <span id="L41" class="LineNr"> 41 </span>  skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L42" class="LineNr"> 42 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L43" class="LineNr"> 43 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L44" class="LineNr"> 44 </span>    in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L46" class="LineNr"> 46 </span>  <span class="Delimiter">}</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L48" class="LineNr"> 48 </span>    string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L49" class="LineNr"> 49 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L50" class="LineNr"> 50 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L51" class="LineNr"> 51 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete string tree at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L52" class="LineNr"> 52 </span>      <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
-<span id="L53" class="LineNr"> 53 </span>    <span class="Delimiter">}</span>
-<span id="L54" class="LineNr"> 54 </span>    string_tree* result = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
-<span id="L55" class="LineNr"> 55 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete string tree at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> string_tree* result = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Delimiter">}</span>
 <span id="L57" class="LineNr"> 57 </span>  in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip '('</span>
 <span id="L58" class="LineNr"> 58 </span>  string_tree* result = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L59" class="LineNr"> 59 </span>  string_tree** curr = &amp;result<span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L61" class="LineNr"> 61 </span>    skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L62" class="LineNr"> 62 </span>    assert<span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L64" class="LineNr"> 64 </span>    *curr = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">);</span>
-<span id="L65" class="LineNr"> 65 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>      <span class="Delimiter">(</span>*curr<span class="Delimiter">)-&gt;</span>left = parse_string_tree<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Delimiter">}</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr"> 69 </span>      string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L70" class="LineNr"> 70 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>        assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L72" class="LineNr"> 72 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete string tree at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L73" class="LineNr"> 73 </span>        <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
-<span id="L74" class="LineNr"> 74 </span>      <span class="Delimiter">}</span>
-<span id="L75" class="LineNr"> 75 </span>      <span class="Delimiter">(</span>*curr<span class="Delimiter">)-&gt;</span>left = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
-<span id="L76" class="LineNr"> 76 </span>    <span class="Delimiter">}</span>
-<span id="L77" class="LineNr"> 77 </span>    curr = &amp;<span class="Delimiter">(</span>*curr<span class="Delimiter">)-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> *curr = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span><span class="Constant">NULL</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">);</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">)-&gt;</span>left = parse_string_tree<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete string tree at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">(</span>*curr<span class="Delimiter">)-&gt;</span>left = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> curr = &amp;<span class="Delimiter">(</span>*curr<span class="Delimiter">)-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">}</span>
 <span id="L79" class="LineNr"> 79 </span>  in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip ')'</span>
 <span id="L80" class="LineNr"> 80 </span>  assert<span class="Delimiter">(</span>*curr == <span class="Constant">NULL</span><span class="Delimiter">);</span>
diff --git a/html/018type_abbreviations.cc.html b/html/018type_abbreviations.cc.html
index c5b4978b..2df2762f 100644
--- a/html/018type_abbreviations.cc.html
+++ b/html/018type_abbreviations.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
 .SalientComment { color: #00ffff; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muRecipe { color: #ff8700; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
-.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -86,32 +87,32 @@ if ('onhashchange' in window) {
 <span id="L23" class="LineNr"> 23 </span>  string new_type_name = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L24" class="LineNr"> 24 </span>  assert<span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> || !new_type_name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">)</span> || new_type_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L26" class="LineNr"> 26 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement; must be of the form 'type &lt;new type name&gt; = &lt;type expression&gt;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement; must be of the form 'type &lt;new type name&gt; = &lt;type expression&gt;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L28" class="LineNr"> 28 </span>  <span class="Delimiter">}</span>
 <span id="L29" class="LineNr"> 29 </span>  string arrow = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L30" class="LineNr"> 30 </span>  assert<span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> || !arrow<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
 <span id="L31" class="LineNr"> 31 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>arrow<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L32" class="LineNr"> 32 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L33" class="LineNr"> 33 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Delimiter">}</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>arrow != <span class="Constant">&quot;=&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L36" class="LineNr"> 36 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'type' statements must be of the form 'type &lt;new type name&gt; = &lt;type expression&gt;' but got 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'type' statements must be of the form 'type &lt;new type name&gt; = &lt;type expression&gt;' but got 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Delimiter">}</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L40" class="LineNr"> 40 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot; ='</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L41" class="LineNr"> 41 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot; ='</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L42" class="LineNr"> 42 </span>  <span class="Delimiter">}</span>
 <span id="L43" class="LineNr"> 43 </span>  string old = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>old<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L45" class="LineNr"> 45 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot; ='</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L46" class="LineNr"> 46 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'type' statements must be of the form 'type &lt;new type name&gt; = &lt;type expression&gt;' but got 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L47" class="LineNr"> 47 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'type' statement 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot; ='</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'type' statements must be of the form 'type &lt;new type name&gt; = &lt;type expression&gt;' but got 'type &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Delimiter">}</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> new_type_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L50" class="LineNr"> 50 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'type' conflict: '&quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot;' defined as both '&quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> new_type_name<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;' and '&quot;</span> &lt;&lt; old &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L51" class="LineNr"> 51 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'type' conflict: '&quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot;' defined as both '&quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> new_type_name<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;' and '&quot;</span> &lt;&lt; old &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Delimiter">}</span>
 <span id="L53" class="LineNr"> 53 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;type&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;alias &quot;</span> &lt;&lt; new_type_name &lt;&lt; <span class="Constant">&quot; = &quot;</span> &lt;&lt; old &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L54" class="LineNr"> 54 </span>  type_tree* old_type = <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>old<span class="Delimiter">);</span>
@@ -171,15 +172,15 @@ if ('onhashchange' in window) {
 <span id="L108" class="LineNr">108 </span><span class="Delimiter">:(code)</span>
 <span id="L109" class="LineNr">109 </span><span class="Normal">void</span> <a href='018type_abbreviations.cc.html#L109'>restore_type_abbreviations</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> type_tree*&gt;::iterator p = Type_abbreviations<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Type_abbreviations<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L111" class="LineNr">111 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_abbreviations_snapshot<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
-<span id="L112" class="LineNr">112 </span>      <span class="Normal">delete</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_abbreviations_snapshot<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Delimiter">}</span>
 <span id="L114" class="LineNr">114 </span>  Type_abbreviations<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L115" class="LineNr">115 </span>  Type_abbreviations = Type_abbreviations_snapshot<span class="Delimiter">;</span>
 <span id="L116" class="LineNr">116 </span><span class="Delimiter">}</span>
 <span id="L117" class="LineNr">117 </span><span class="Normal">void</span> <a href='018type_abbreviations.cc.html#L117'>clear_type_abbreviations</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> type_tree*&gt;::iterator p = Type_abbreviations<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Type_abbreviations<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L119" class="LineNr">119 </span>    <span class="Normal">delete</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
 <span id="L120" class="LineNr">120 </span>  Type_abbreviations<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L121" class="LineNr">121 </span><span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>
@@ -233,16 +234,16 @@ if ('onhashchange' in window) {
 <span id="L170" class="LineNr">170 </span><span class="Normal">void</span> expand_type_abbreviations<span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L171" class="LineNr">171 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- expand type abbreviations in <a href='010vm.cc.html#L19'>recipe</a> '&quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L173" class="LineNr">173 </span>    <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L174" class="LineNr">174 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L175" class="LineNr">175 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L176" class="LineNr">176 </span>      expand_type_abbreviations<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L177" class="LineNr">177 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient type after expanding abbreviations: &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L178" class="LineNr">178 </span>    <span class="Delimiter">}</span>
-<span id="L179" class="LineNr">179 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L180" class="LineNr">180 </span>      expand_type_abbreviations<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L181" class="LineNr">181 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product type after expanding abbreviations: &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L182" class="LineNr">182 </span>    <span class="Delimiter">}</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient type after expanding abbreviations: &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product type after expanding abbreviations: &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Delimiter">}</span>
 <span id="L184" class="LineNr">184 </span>  <span class="Comment">// End Expand Type Abbreviations(caller)</span>
 <span id="L185" class="LineNr">185 </span><span class="Delimiter">}</span>
@@ -250,12 +251,12 @@ if ('onhashchange' in window) {
 <span id="L187" class="LineNr">187 </span><span class="Normal">void</span> expand_type_abbreviations<span class="Delimiter">(</span>type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L188" class="LineNr">188 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L189" class="LineNr">189 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L190" class="LineNr">190 </span>    expand_type_abbreviations<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
-<span id="L191" class="LineNr">191 </span>    expand_type_abbreviations<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
-<span id="L192" class="LineNr">192 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Delimiter">}</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span>
-<span id="L195" class="LineNr">195 </span>    *type = type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">));</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> *type = type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">));</span>
 <span id="L196" class="LineNr">196 </span><span class="Delimiter">}</span>
 </pre>
 </body>
diff --git a/html/020run.cc.html b/html/020run.cc.html
index 84bc8e95..1e4a93a2 100644
--- a/html/020run.cc.html
+++ b/html/020run.cc.html
@@ -20,10 +20,11 @@ a:hover { text-decoration: underline; }
 .muRecipe { color: #ff8700; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.traceAbsent { color: #c00000; }
 .Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
-.traceAbsent { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .Special { color: #c00000; }
@@ -129,44 +130,44 @@ if ('onhashchange' in window) {
 <span id="L64" class="LineNr"> 64 </span>
 <span id="L65" class="LineNr"> 65 </span><span class="Normal">void</span> run_current_routine<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L66" class="LineNr"> 66 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='072scheduler.cc.html#L28'>should_continue_running</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// beware: may modify Current_routine</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Comment">// Running One Instruction</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>is_label<span class="Delimiter">)</span> <span class="Delimiter">{</span> ++current_step_index<span class="Delimiter">();</span>  <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
-<span id="L69" class="LineNr"> 69 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span>Initial_callstack_depth + Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;something wrote to location 0; this should never happen</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L72" class="LineNr"> 72 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="Delimiter">}</span>
-<span id="L74" class="LineNr"> 74 </span>    <span class="Comment">// read all ingredients from memory, each potentially spanning multiple locations</span>
-<span id="L75" class="LineNr"> 75 </span>    vector&lt;vector&lt;<span class="Normal">double</span>&gt; &gt; ingredients<span class="Delimiter">;</span>
-<span id="L76" class="LineNr"> 76 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>should_copy_ingredients<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L77" class="LineNr"> 77 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L78" class="LineNr"> 78 </span>        ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)));</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Delimiter">}</span>
-<span id="L80" class="LineNr"> 80 </span>    <span class="Comment">// instructions below will write to 'products'</span>
-<span id="L81" class="LineNr"> 81 </span>    vector&lt;vector&lt;<span class="Normal">double</span>&gt; &gt; products<span class="Delimiter">;</span>
-<span id="L82" class="LineNr"> 82 </span>    <span class="Normal">switch</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L83" class="LineNr"> 83 </span>      <span class="Comment">// Primitive Recipe Implementations</span>
-<span id="L84" class="LineNr"> 84 </span>      <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>: <span class="Delimiter">{</span>
-<span id="L85" class="LineNr"> 85 </span>        copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
-<span id="L86" class="LineNr"> 86 </span>        <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L87" class="LineNr"> 87 </span>      <span class="Delimiter">}</span>
-<span id="L88" class="LineNr"> 88 </span>      <span class="Comment">// End Primitive Recipe Implementations</span>
-<span id="L89" class="LineNr"> 89 </span>      <span class="Normal">default</span>: <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>        cout &lt;&lt; <span class="Constant">&quot;not a primitive op: &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>operation &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L91" class="LineNr"> 91 </span>      <span class="Delimiter">}</span>
-<span id="L92" class="LineNr"> 92 </span>    <span class="Delimiter">}</span>
-<span id="L93" class="LineNr"> 93 </span>    <span class="Comment">// Write Products of Instruction</span>
-<span id="L94" class="LineNr"> 94 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;: failed to write to all products! &quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L96" class="LineNr"> 96 </span>    <span class="Delimiter">}</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L98" class="LineNr"> 98 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L99" class="LineNr"> 99 </span>        write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L100" class="LineNr">100 </span>    <span class="Delimiter">}</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Comment">// End Write Products of Instruction</span>
-<span id="L102" class="LineNr">102 </span>    <span class="Comment">// End Running One Instruction</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Normal">finish_instruction</span>:<span class="Delimiter">;</span>
-<span id="L104" class="LineNr">104 </span>    ++current_step_index<span class="Delimiter">();</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Comment">// Running One Instruction</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>is_label<span class="Delimiter">)</span> <span class="Delimiter">{</span> ++current_step_index<span class="Delimiter">();</span>  <span class="Identifier">continue</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span>Initial_callstack_depth + Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;something wrote to location 0; this should never happen</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Comment">// read all ingredients from memory, each potentially spanning multiple locations</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> vector&lt;vector&lt;<span class="Normal">double</span>&gt; &gt; ingredients<span class="Delimiter">;</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>should_copy_ingredients<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)));</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Comment">// instructions below will write to 'products'</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> vector&lt;vector&lt;<span class="Normal">double</span>&gt; &gt; products<span class="Delimiter">;</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Normal">switch</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Primitive Recipe Implementations</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>: <span class="Delimiter">{</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Primitive Recipe Implementations</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">default</span>: <span class="Delimiter">{</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cout &lt;&lt; <span class="Constant">&quot;not a primitive op: &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>operation &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Comment">// Write Products of Instruction</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;: failed to write to all products! &quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> write_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Write Products of Instruction</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Running One Instruction</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Normal">finish_instruction</span>:<span class="Delimiter">;</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> ++current_step_index<span class="Delimiter">();</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Delimiter">}</span>
 <span id="L106" class="LineNr">106 </span>  <span class="Normal">stop_running_current_routine</span>:<span class="Delimiter">;</span>
 <span id="L107" class="LineNr">107 </span><span class="Delimiter">}</span>
@@ -236,13 +237,13 @@ if ('onhashchange' in window) {
 <span id="L171" class="LineNr">171 </span>  ++argv<span class="Delimiter">;</span>
 <span id="L172" class="LineNr">172 </span>  --argc<span class="Delimiter">;</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>argc &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L174" class="LineNr">174 </span>    <span class="Comment">// ignore argv past '--'; that's commandline args for 'main'</span>
-<span id="L175" class="LineNr">175 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>string<span class="Delimiter">(</span>*argv<span class="Delimiter">)</span> == <span class="Constant">&quot;--&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L176" class="LineNr">176 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span>*argv<span class="Delimiter">,</span> <span class="Constant">&quot;--&quot;</span><span class="Delimiter">))</span>
-<span id="L177" class="LineNr">177 </span>      cerr &lt;&lt; <span class="Constant">&quot;treating &quot;</span> &lt;&lt; *argv &lt;&lt; <span class="Constant">&quot; as a file rather than an option</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L178" class="LineNr">178 </span>    load_file_or_directory<span class="Delimiter">(</span>*argv<span class="Delimiter">);</span>
-<span id="L179" class="LineNr">179 </span>    --argc<span class="Delimiter">;</span>
-<span id="L180" class="LineNr">180 </span>    ++argv<span class="Delimiter">;</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Comment">// ignore argv past '--'; that's commandline args for 'main'</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>string<span class="Delimiter">(</span>*argv<span class="Delimiter">)</span> == <span class="Constant">&quot;--&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span>*argv<span class="Delimiter">,</span> <span class="Constant">&quot;--&quot;</span><span class="Delimiter">))</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;treating &quot;</span> &lt;&lt; *argv &lt;&lt; <span class="Constant">&quot; as a file rather than an option</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> load_file_or_directory<span class="Delimiter">(</span>*argv<span class="Delimiter">);</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> --argc<span class="Delimiter">;</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> ++argv<span class="Delimiter">;</span>
 <span id="L181" class="LineNr">181 </span>  <span class="Delimiter">}</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Run_tests<span class="Delimiter">)</span> Recipe<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">));</span>
 <span id="L183" class="LineNr">183 </span><span class="Delimiter">}</span>
@@ -259,8 +260,8 @@ if ('onhashchange' in window) {
 <span id="L194" class="LineNr">194 </span>  <span class="Comment">// Running Main</span>
 <span id="L195" class="LineNr">195 </span>  <a href='000organization.cc.html#L134'>setup</a><span class="Delimiter">();</span>
 <span id="L196" class="LineNr">196 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Start_tracing<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L197" class="LineNr">197 </span>    Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
-<span id="L198" class="LineNr">198 </span>    Save_trace = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> Save_trace = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L199" class="LineNr">199 </span>  <span class="Delimiter">}</span>
 <span id="L200" class="LineNr">200 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;=== Starting to run&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L201" class="LineNr">201 </span>  assert<span class="Delimiter">(</span>Num_calls_to_transform_all == <span class="Constant">1</span><span class="Delimiter">);</span>
@@ -285,15 +286,15 @@ if ('onhashchange' in window) {
 <span id="L220" class="LineNr">220 </span><span class="Delimiter">:(code)</span>
 <span id="L221" class="LineNr">221 </span><span class="Normal">void</span> dump_profile<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L222" class="LineNr">222 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;::iterator p = Instructions_running<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Instructions_running<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L223" class="LineNr">223 </span>    cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L224" class="LineNr">224 </span>  <span class="Delimiter">}</span>
 <span id="L225" class="LineNr">225 </span>  cerr &lt;&lt; <span class="Constant">&quot;== locations read</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L226" class="LineNr">226 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;::iterator p = Locations_read<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Locations_read<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L227" class="LineNr">227 </span>    cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L228" class="LineNr">228 </span>  <span class="Delimiter">}</span>
 <span id="L229" class="LineNr">229 </span>  cerr &lt;&lt; <span class="Constant">&quot;== locations read by <a href='010vm.cc.html#L32'>instruction</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L230" class="LineNr">230 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;::iterator p = Locations_read_by_instruction<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Locations_read_by_instruction<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L231" class="LineNr">231 </span>    cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>second &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L232" class="LineNr">232 </span>  <span class="Delimiter">}</span>
 <span id="L233" class="LineNr">233 </span><span class="Delimiter">}</span>
 <span id="L234" class="LineNr">234 </span><span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
@@ -302,10 +303,10 @@ if ('onhashchange' in window) {
 <span id="L237" class="LineNr">237 </span><span class="Delimiter">:(code)</span>
 <span id="L238" class="LineNr">238 </span><span class="Normal">void</span> cleanup_main<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L239" class="LineNr">239 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Save_trace &amp;&amp; Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L240" class="LineNr">240 </span>    cerr &lt;&lt; <span class="Constant">&quot;writing <a href='003trace.cc.html#L161'>trace</a> to 'last_run'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L241" class="LineNr">241 </span>    ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_run&quot;</span><span class="Delimiter">);</span>
-<span id="L242" class="LineNr">242 </span>    fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
-<span id="L243" class="LineNr">243 </span>    fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;writing <a href='003trace.cc.html#L161'>trace</a> to 'last_run'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_run&quot;</span><span class="Delimiter">);</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
 <span id="L244" class="LineNr">244 </span>  <span class="Delimiter">}</span>
 <span id="L245" class="LineNr">245 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Normal">delete</span> Trace_stream<span class="Delimiter">,</span> Trace_stream = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L246" class="LineNr">246 </span><span class="Delimiter">}</span>
@@ -315,13 +316,13 @@ if ('onhashchange' in window) {
 <span id="L250" class="LineNr">250 </span><span class="Delimiter">:(code)</span>
 <span id="L251" class="LineNr">251 </span><span class="Normal">void</span> load_file_or_directory<span class="Delimiter">(</span>string filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L252" class="LineNr">252 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_directory<span class="Delimiter">(</span>filename<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L253" class="LineNr">253 </span>    load_all<span class="Delimiter">(</span>filename<span class="Delimiter">);</span>
-<span id="L254" class="LineNr">254 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> load_all<span class="Delimiter">(</span>filename<span class="Delimiter">);</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L255" class="LineNr">255 </span>  <span class="Delimiter">}</span>
 <span id="L256" class="LineNr">256 </span>  ifstream fin<span class="Delimiter">(</span>filename<span class="Delimiter">.</span>c_str<span class="Delimiter">());</span>
 <span id="L257" class="LineNr">257 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!fin<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L258" class="LineNr">258 </span>    cerr &lt;&lt; <span class="Constant">&quot;no such file '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  <span class="Comment">// don't raise, just warn. just in case it's just a name for a scenario to run.</span>
-<span id="L259" class="LineNr">259 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;no such file '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  <span class="Comment">// don't raise, just warn. just in case it's just a name for a scenario to run.</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L260" class="LineNr">260 </span>  <span class="Delimiter">}</span>
 <span id="L261" class="LineNr">261 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;=== &quot;</span> &lt;&lt; filename &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L262" class="LineNr">262 </span>  load<span class="Delimiter">(</span>fin<span class="Delimiter">);</span>
@@ -338,11 +339,11 @@ if ('onhashchange' in window) {
 <span id="L273" class="LineNr">273 </span>  dirent** files<span class="Delimiter">;</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Normal">int</span> num_files = scandir<span class="Delimiter">(</span>dir<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> &amp;files<span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">,</span> alphasort<span class="Delimiter">);</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; num_files<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L276" class="LineNr">276 </span>    string curr_file = files[i]<span class="Delimiter">-&gt;</span>d_name<span class="Delimiter">;</span>
-<span id="L277" class="LineNr">277 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>isdigit<span class="Delimiter">(</span>curr_file<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
-<span id="L278" class="LineNr">278 </span>      load_file_or_directory<span class="Delimiter">(</span>dir+<span class="Constant">'/'</span>+curr_file<span class="Delimiter">);</span>
-<span id="L279" class="LineNr">279 </span>    free<span class="Delimiter">(</span>files[i]<span class="Delimiter">);</span>
-<span id="L280" class="LineNr">280 </span>    files[i] = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> string curr_file = files[i]<span class="Delimiter">-&gt;</span>d_name<span class="Delimiter">;</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isdigit<span class="Delimiter">(</span>curr_file<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> load_file_or_directory<span class="Delimiter">(</span>dir+<span class="Constant">'/'</span>+curr_file<span class="Delimiter">);</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> free<span class="Delimiter">(</span>files[i]<span class="Delimiter">);</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> files[i] = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L281" class="LineNr">281 </span>  <span class="Delimiter">}</span>
 <span id="L282" class="LineNr">282 </span>  free<span class="Delimiter">(</span>files<span class="Delimiter">);</span>
 <span id="L283" class="LineNr">283 </span><span class="Delimiter">}</span>
@@ -357,15 +358,15 @@ if ('onhashchange' in window) {
 <span id="L292" class="LineNr">292 </span>  <span class="Comment">// Begin Preprocess read_memory(x)</span>
 <span id="L293" class="LineNr">293 </span>  vector&lt;<span class="Normal">double</span>&gt; result<span class="Delimiter">;</span>
 <span id="L294" class="LineNr">294 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L295" class="LineNr">295 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>x<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
-<span id="L296" class="LineNr">296 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>x<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L297" class="LineNr">297 </span>  <span class="Delimiter">}</span>
 <span id="L298" class="LineNr">298 </span>  <span class="Comment">// End Preprocess read_memory(x)</span>
 <span id="L299" class="LineNr">299 </span>  <span class="Normal">int</span> size = size_of<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L300" class="LineNr">300 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> offset = <span class="Constant">0</span><span class="Delimiter">;</span>  offset &lt; size<span class="Delimiter">;</span>  ++offset<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L301" class="LineNr">301 </span>    <span class="Normal">double</span> val = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value+offset<span class="Delimiter">);</span>
-<span id="L302" class="LineNr">302 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>value+offset &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>val<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L303" class="LineNr">303 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>val<span class="Delimiter">);</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> <span class="Normal">double</span> val = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value+offset<span class="Delimiter">);</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>value+offset &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>val<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>val<span class="Delimiter">);</span>
 <span id="L304" class="LineNr">304 </span>  <span class="Delimiter">}</span>
 <span id="L305" class="LineNr">305 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L306" class="LineNr">306 </span><span class="Delimiter">}</span>
@@ -374,25 +375,25 @@ if ('onhashchange' in window) {
 <span id="L309" class="LineNr">309 </span>  assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">);</span>  <span class="Comment">// run-time only</span>
 <span id="L310" class="LineNr">310 </span>  <span class="Comment">// Begin Preprocess write_memory(x, data)</span>
 <span id="L311" class="LineNr">311 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L312" class="LineNr">312 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't write to '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'; no type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L313" class="LineNr">313 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't write to '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'; no type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Delimiter">}</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L316" class="LineNr">316 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Comment">// End Preprocess write_memory(x, data)</span>
 <span id="L318" class="LineNr">318 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L319" class="LineNr">319 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't write to location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L320" class="LineNr">320 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't write to location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L321" class="LineNr">321 </span>  <span class="Delimiter">}</span>
 <span id="L322" class="LineNr">322 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>size_mismatch<span class="Delimiter">(</span>x<span class="Delimiter">,</span> data<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L323" class="LineNr">323 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;size mismatch in storing to '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' (&quot;</span> &lt;&lt; size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;) at '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L324" class="LineNr">324 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;size mismatch in storing to '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' (&quot;</span> &lt;&lt; size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;) at '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L325" class="LineNr">325 </span>  <span class="Delimiter">}</span>
 <span id="L326" class="LineNr">326 </span>  <span class="Comment">// End write_memory(x) Special-cases</span>
 <span id="L327" class="LineNr">327 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> offset = <span class="Constant">0</span><span class="Delimiter">;</span>  offset &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">);</span>  ++offset<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L328" class="LineNr">328 </span>    assert<span class="Delimiter">(</span>x<span class="Delimiter">.</span>value+offset &gt; <span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L329" class="LineNr">329 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>value+offset &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L330" class="LineNr">330 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value+offset<span class="Delimiter">,</span> data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">));</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>x<span class="Delimiter">.</span>value+offset &gt; <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>value+offset &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L330" class="LineNr">330 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value+offset<span class="Delimiter">,</span> data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">));</span>
 <span id="L331" class="LineNr">331 </span>  <span class="Delimiter">}</span>
 <span id="L332" class="LineNr">332 </span><span class="Delimiter">}</span>
 <span id="L333" class="LineNr">333 </span>
@@ -405,17 +406,17 @@ if ('onhashchange' in window) {
 <span id="L340" class="LineNr">340 </span><span class="Normal">int</span> size_of<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L341" class="LineNr">341 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L343" class="LineNr">343 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// error value, but we'll raise it elsewhere</span>
-<span id="L344" class="LineNr">344 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L345" class="LineNr">345 </span>    <span class="Comment">// End size_of(type) Atom Special-cases</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// error value, but we'll raise it elsewhere</span>
+<span id="L344" class="LineNr">344 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <span class="Comment">// End size_of(type) Atom Special-cases</span>
 <span id="L346" class="LineNr">346 </span>  <span class="Delimiter">}</span>
 <span id="L347" class="LineNr">347 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L348" class="LineNr">348 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L349" class="LineNr">349 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L350" class="LineNr">350 </span>      <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L351" class="LineNr">351 </span>    <span class="Delimiter">}</span>
-<span id="L352" class="LineNr">352 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L353" class="LineNr">353 </span>    <span class="Comment">// End size_of(type) Non-atom Special-cases</span>
+<span id="L348" class="LineNr">348 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L349" class="LineNr">349 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L350" class="LineNr">350 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> <span class="Comment">// End size_of(type) Non-atom Special-cases</span>
 <span id="L354" class="LineNr">354 </span>  <span class="Delimiter">}</span>
 <span id="L355" class="LineNr">355 </span>  <span class="Comment">// End size_of(type) Special-cases</span>
 <span id="L356" class="LineNr">356 </span>  <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
@@ -453,9 +454,9 @@ if ('onhashchange' in window) {
 <span id="L388" class="LineNr">388 </span>  <span class="Comment">// if a test defines main, it probably wants to start there regardless of</span>
 <span id="L389" class="LineNr">389 </span>  <span class="Comment">// definition order</span>
 <span id="L390" class="LineNr">390 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">)))</span>
-<span id="L391" class="LineNr">391 </span>    run<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">));</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> run<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">));</span>
 <span id="L392" class="LineNr">392 </span>  <span class="Normal">else</span>
-<span id="L393" class="LineNr">393 </span>    run<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>front<span class="Delimiter">());</span>
+<span id="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span> run<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>front<span class="Delimiter">());</span>
 <span id="L394" class="LineNr">394 </span><span class="Delimiter">}</span>
 <span id="L395" class="LineNr">395 </span>
 <span id="L396" class="LineNr">396 </span><span class="Delimiter">:(scenario run_label)</span>
diff --git a/html/021check_instruction.cc.html b/html/021check_instruction.cc.html
index f6031c64..011ea0a7 100644
--- a/html/021check_instruction.cc.html
+++ b/html/021check_instruction.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
-.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.traceContains { color: #008000; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.traceContains { color: #008000; }
+.muRecipe { color: #ff8700; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -77,30 +78,30 @@ if ('onhashchange' in window) {
 <span id="L16" class="LineNr"> 16 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- perform checks for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L17" class="LineNr"> 17 </span>  map&lt;string<span class="Delimiter">,</span> vector&lt;type_ordinal&gt; &gt; metadata<span class="Delimiter">;</span>
 <span id="L18" class="LineNr"> 18 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L19" class="LineNr"> 19 </span>    instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L20" class="LineNr"> 20 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L21" class="LineNr"> 21 </span>    <span class="Normal">switch</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L22" class="LineNr"> 22 </span>      <span class="Comment">// Primitive Recipe Checks</span>
-<span id="L23" class="LineNr"> 23 </span>      <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>: <span class="Delimiter">{</span>
-<span id="L24" class="LineNr"> 24 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L25" class="LineNr"> 25 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredients and products should match in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L26" class="LineNr"> 26 </span>          <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L27" class="LineNr"> 27 </span>        <span class="Delimiter">}</span>
-<span id="L28" class="LineNr"> 28 </span>        <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L29" class="LineNr"> 29 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L30" class="LineNr"> 30 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't copy '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' to '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'; types don't match</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L31" class="LineNr"> 31 </span>            <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L32" class="LineNr"> 32 </span>          <span class="Delimiter">}</span>
-<span id="L33" class="LineNr"> 33 </span>        <span class="Delimiter">}</span>
-<span id="L34" class="LineNr"> 34 </span>        <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L35" class="LineNr"> 35 </span>      <span class="Delimiter">}</span>
-<span id="L36" class="LineNr"> 36 </span>      <span class="Comment">// End Primitive Recipe Checks</span>
-<span id="L37" class="LineNr"> 37 </span>      <span class="Normal">default</span>: <span class="Delimiter">{</span>
-<span id="L38" class="LineNr"> 38 </span>        <span class="Comment">// Defined Recipe Checks</span>
-<span id="L39" class="LineNr"> 39 </span>        <span class="Comment">// End Defined Recipe Checks</span>
-<span id="L40" class="LineNr"> 40 </span>      <span class="Delimiter">}</span>
-<span id="L41" class="LineNr"> 41 </span>    <span class="Delimiter">}</span>
-<span id="L42" class="LineNr"> 42 </span>    <span class="Normal">finish_checking_instruction</span>:<span class="Delimiter">;</span>
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Normal">switch</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Primitive Recipe Checks</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>: <span class="Delimiter">{</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredients and products should match in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't copy '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' to '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'; types don't match</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Primitive Recipe Checks</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">default</span>: <span class="Delimiter">{</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Defined Recipe Checks</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Defined Recipe Checks</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Normal">finish_checking_instruction</span>:<span class="Delimiter">;</span>
 <span id="L43" class="LineNr"> 43 </span>  <span class="Delimiter">}</span>
 <span id="L44" class="LineNr"> 44 </span><span class="Delimiter">}</span>
 <span id="L45" class="LineNr"> 45 </span>
@@ -172,14 +173,14 @@ if ('onhashchange' in window) {
 <span id="L111" class="LineNr">111 </span>  <span class="Comment">// this will be highlighted in red inside vim. just for setting up some tests.</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L166'>is_unsafe</a><span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Comment">// End Matching Types For Literal(to)</span>
-<span id="L116" class="LineNr">116 </span>    <span class="Comment">// allow writing 0 to any address</span>
-<span id="L117" class="LineNr">117 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
-<span id="L118" class="LineNr">118 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L119" class="LineNr">119 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">))</span>
-<span id="L120" class="LineNr">120 </span>      <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
-<span id="L121" class="LineNr">121 </span>    <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>to<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// literals are always scalars</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Matching Types For Literal(to)</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Comment">// allow writing 0 to any address</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">))</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>to<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// literals are always scalars</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Delimiter">}</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">);</span>
 <span id="L124" class="LineNr">124 </span><span class="Delimiter">}</span>
@@ -204,8 +205,8 @@ if ('onhashchange' in window) {
 <span id="L143" class="LineNr">143 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!from<span class="Delimiter">)</span> <span class="Identifier">return</span> to<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L144" class="LineNr">144 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom != to<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L146" class="LineNr">146 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>name == to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
-<span id="L147" class="LineNr">147 </span>    <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>value == to<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>name == to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>value == to<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Delimiter">}</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
 <span id="L150" class="LineNr">150 </span><span class="Delimiter">}</span>
@@ -237,8 +238,8 @@ if ('onhashchange' in window) {
 <span id="L176" class="LineNr">176 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L178" class="LineNr">178 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L179" class="LineNr">179 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L180" class="LineNr">180 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L181" class="LineNr">181 </span>  <span class="Delimiter">}</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
 <span id="L183" class="LineNr">183 </span><span class="Delimiter">}</span>
@@ -252,8 +253,8 @@ if ('onhashchange' in window) {
 <span id="L191" class="LineNr">191 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L192" class="LineNr">192 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L194" class="LineNr">194 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L195" class="LineNr">195 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L196" class="LineNr">196 </span>  <span class="Delimiter">}</span>
 <span id="L197" class="LineNr">197 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
 <span id="L198" class="LineNr">198 </span><span class="Delimiter">}</span>
@@ -271,8 +272,8 @@ if ('onhashchange' in window) {
 <span id="L210" class="LineNr">210 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L211" class="LineNr">211 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L212" class="LineNr">212 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L213" class="LineNr">213 </span>    <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal-fractional-number&quot;</span>
-<span id="L214" class="LineNr">214 </span>        || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">;</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal-fractional-number&quot;</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">;</span>
 <span id="L215" class="LineNr">215 </span>  <span class="Delimiter">}</span>
 <span id="L216" class="LineNr">216 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>  <span class="Comment">// permit arithmetic on unicode code points</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">);</span>
@@ -297,7 +298,7 @@ if ('onhashchange' in window) {
 <span id="L236" class="LineNr">236 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L237" class="LineNr">237 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L238" class="LineNr">238 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span>
-<span id="L239" class="LineNr">239 </span>    <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">;</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">;</span>
 <span id="L240" class="LineNr">240 </span>  <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>type<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L241" class="LineNr">241 </span><span class="Delimiter">}</span>
 </pre>
diff --git a/html/022arithmetic.cc.html b/html/022arithmetic.cc.html
index b4c29d2f..e2d7083c 100644
--- a/html/022arithmetic.cc.html
+++ b/html/022arithmetic.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.traceContains { color: #008000; }
 .muRecipe { color: #ff8700; }
-.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.Special { color: #c00000; }
 .PreProc { color: #800080; }
-.traceContains { color: #008000; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -70,18 +71,18 @@ if ('onhashchange' in window) {
 <span id="L8" class="LineNr">  8 </span><span class="Normal">case</span> ADD: <span class="Delimiter">{</span>
 <span id="L9" class="LineNr">  9 </span>  <span class="Comment">// primary goal of these checks is to forbid address arithmetic</span>
 <span id="L10" class="LineNr"> 10 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L11" class="LineNr"> 11 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L12" class="LineNr"> 12 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'add' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L13" class="LineNr"> 13 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L14" class="LineNr"> 14 </span>    <span class="Delimiter">}</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L12" class="LineNr"> 12 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'add' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L15" class="LineNr"> 15 </span>  <span class="Delimiter">}</span>
 <span id="L16" class="LineNr"> 16 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L17" class="LineNr"> 17 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'add' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L18" class="LineNr"> 18 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'add' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="Delimiter">}</span>
 <span id="L20" class="LineNr"> 20 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L21" class="LineNr"> 21 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'add' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L22" class="LineNr"> 22 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'add' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L23" class="LineNr"> 23 </span>  <span class="Delimiter">}</span>
 <span id="L24" class="LineNr"> 24 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L25" class="LineNr"> 25 </span><span class="Delimiter">}</span>
@@ -89,7 +90,7 @@ if ('onhashchange' in window) {
 <span id="L27" class="LineNr"> 27 </span><span class="Normal">case</span> ADD: <span class="Delimiter">{</span>
 <span id="L28" class="LineNr"> 28 </span>  <span class="Normal">double</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L29" class="LineNr"> 29 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L30" class="LineNr"> 30 </span>    result += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> result += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L31" class="LineNr"> 31 </span>  <span class="Delimiter">}</span>
 <span id="L32" class="LineNr"> 32 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L33" class="LineNr"> 33 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -137,23 +138,23 @@ if ('onhashchange' in window) {
 <span id="L75" class="LineNr"> 75 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L76" class="LineNr"> 76 </span><span class="Normal">case</span> SUBTRACT: <span class="Delimiter">{</span>
 <span id="L77" class="LineNr"> 77 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L78" class="LineNr"> 78 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' has no ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' has no ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L80" class="LineNr"> 80 </span>  <span class="Delimiter">}</span>
 <span id="L81" class="LineNr"> 81 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L82" class="LineNr"> 82 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='022arithmetic.cc.html#L108'>is_raw</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// permit address offset computations in tests</span>
-<span id="L83" class="LineNr"> 83 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L84" class="LineNr"> 84 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L85" class="LineNr"> 85 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L86" class="LineNr"> 86 </span>    <span class="Delimiter">}</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='022arithmetic.cc.html#L108'>is_raw</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// permit address offset computations in tests</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Delimiter">}</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L90" class="LineNr"> 90 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Delimiter">}</span>
 <span id="L92" class="LineNr"> 92 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L93" class="LineNr"> 93 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L94" class="LineNr"> 94 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'subtract' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Delimiter">}</span>
 <span id="L96" class="LineNr"> 96 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L97" class="LineNr"> 97 </span><span class="Delimiter">}</span>
@@ -161,7 +162,7 @@ if ('onhashchange' in window) {
 <span id="L99" class="LineNr"> 99 </span><span class="Normal">case</span> SUBTRACT: <span class="Delimiter">{</span>
 <span id="L100" class="LineNr">100 </span>  <span class="Normal">double</span> result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L101" class="LineNr">101 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L102" class="LineNr">102 </span>    result -= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> result -= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L103" class="LineNr">103 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L104" class="LineNr">104 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -198,18 +199,18 @@ if ('onhashchange' in window) {
 <span id="L136" class="LineNr">136 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L137" class="LineNr">137 </span><span class="Normal">case</span> MULTIPLY: <span class="Delimiter">{</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L139" class="LineNr">139 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L140" class="LineNr">140 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'multiply' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L141" class="LineNr">141 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L142" class="LineNr">142 </span>    <span class="Delimiter">}</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'multiply' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L143" class="LineNr">143 </span>  <span class="Delimiter">}</span>
 <span id="L144" class="LineNr">144 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L145" class="LineNr">145 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'multiply' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L146" class="LineNr">146 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'multiply' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L147" class="LineNr">147 </span>  <span class="Delimiter">}</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L149" class="LineNr">149 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'multiply' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L150" class="LineNr">150 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'multiply' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L153" class="LineNr">153 </span><span class="Delimiter">}</span>
@@ -217,7 +218,7 @@ if ('onhashchange' in window) {
 <span id="L155" class="LineNr">155 </span><span class="Normal">case</span> MULTIPLY: <span class="Delimiter">{</span>
 <span id="L156" class="LineNr">156 </span>  <span class="Normal">double</span> result = <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L157" class="LineNr">157 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L158" class="LineNr">158 </span>    result *= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> result *= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Delimiter">}</span>
 <span id="L160" class="LineNr">160 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L161" class="LineNr">161 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -251,22 +252,22 @@ if ('onhashchange' in window) {
 <span id="L189" class="LineNr">189 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L190" class="LineNr">190 </span><span class="Normal">case</span> DIVIDE: <span class="Delimiter">{</span>
 <span id="L191" class="LineNr">191 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L192" class="LineNr">192 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' has no ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L193" class="LineNr">193 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' has no ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Delimiter">}</span>
 <span id="L195" class="LineNr">195 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L196" class="LineNr">196 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L197" class="LineNr">197 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L198" class="LineNr">198 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L199" class="LineNr">199 </span>    <span class="Delimiter">}</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L200" class="LineNr">200 </span>  <span class="Delimiter">}</span>
 <span id="L201" class="LineNr">201 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L202" class="LineNr">202 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L203" class="LineNr">203 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Delimiter">}</span>
 <span id="L205" class="LineNr">205 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L207" class="LineNr">207 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Delimiter">}</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L210" class="LineNr">210 </span><span class="Delimiter">}</span>
@@ -274,7 +275,7 @@ if ('onhashchange' in window) {
 <span id="L212" class="LineNr">212 </span><span class="Normal">case</span> DIVIDE: <span class="Delimiter">{</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Normal">double</span> result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L215" class="LineNr">215 </span>    result /= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> result /= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L216" class="LineNr">216 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L217" class="LineNr">217 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -309,22 +310,22 @@ if ('onhashchange' in window) {
 <span id="L247" class="LineNr">247 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L248" class="LineNr">248 </span><span class="Normal">case</span> DIVIDE_WITH_REMAINDER: <span class="Delimiter">{</span>
 <span id="L249" class="LineNr">249 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L250" class="LineNr">250 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L251" class="LineNr">251 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L252" class="LineNr">252 </span>  <span class="Delimiter">}</span>
 <span id="L253" class="LineNr">253 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L254" class="LineNr">254 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L255" class="LineNr">255 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L256" class="LineNr">256 </span>  <span class="Delimiter">}</span>
 <span id="L257" class="LineNr">257 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L258" class="LineNr">258 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' yields two products in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L259" class="LineNr">259 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' yields two products in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L260" class="LineNr">260 </span>  <span class="Delimiter">}</span>
 <span id="L261" class="LineNr">261 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L262" class="LineNr">262 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L263" class="LineNr">263 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L264" class="LineNr">264 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L265" class="LineNr">265 </span>    <span class="Delimiter">}</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'divide-with-remainder' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L266" class="LineNr">266 </span>  <span class="Delimiter">}</span>
 <span id="L267" class="LineNr">267 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L268" class="LineNr">268 </span><span class="Delimiter">}</span>
@@ -335,11 +336,11 @@ if ('onhashchange' in window) {
 <span id="L273" class="LineNr">273 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> a = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> b = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>b == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L276" class="LineNr">276 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;divide by zero in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L277" class="LineNr">277 </span>    products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L278" class="LineNr">278 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L279" class="LineNr">279 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L280" class="LineNr">280 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;divide by zero in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L281" class="LineNr">281 </span>  <span class="Delimiter">}</span>
 <span id="L282" class="LineNr">282 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> quotient = a / b<span class="Delimiter">;</span>
 <span id="L283" class="LineNr">283 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> remainder = a % b<span class="Delimiter">;</span>
@@ -393,20 +394,20 @@ if ('onhashchange' in window) {
 <span id="L331" class="LineNr">331 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L332" class="LineNr">332 </span><span class="Normal">case</span> SHIFT_LEFT: <span class="Delimiter">{</span>
 <span id="L333" class="LineNr">333 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L334" class="LineNr">334 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L335" class="LineNr">335 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L336" class="LineNr">336 </span>  <span class="Delimiter">}</span>
 <span id="L337" class="LineNr">337 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L338" class="LineNr">338 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L339" class="LineNr">339 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L340" class="LineNr">340 </span>  <span class="Delimiter">}</span>
 <span id="L341" class="LineNr">341 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L342" class="LineNr">342 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L343" class="LineNr">343 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L344" class="LineNr">344 </span>  <span class="Delimiter">}</span>
 <span id="L345" class="LineNr">345 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L346" class="LineNr">346 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L347" class="LineNr">347 </span>    <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-left' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
 <span id="L348" class="LineNr">348 </span>  <span class="Delimiter">}</span>
 <span id="L349" class="LineNr">349 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L350" class="LineNr">350 </span><span class="Delimiter">}</span>
@@ -417,9 +418,9 @@ if ('onhashchange' in window) {
 <span id="L355" class="LineNr">355 </span>  <span class="Normal">int</span> b = <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L356" class="LineNr">356 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L357" class="LineNr">357 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>b &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L358" class="LineNr">358 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;second ingredient can't be negative in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L359" class="LineNr">359 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L360" class="LineNr">360 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;second ingredient can't be negative in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L361" class="LineNr">361 </span>  <span class="Delimiter">}</span>
 <span id="L362" class="LineNr">362 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>a&lt;&lt;b<span class="Delimiter">);</span>
 <span id="L363" class="LineNr">363 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -464,20 +465,20 @@ if ('onhashchange' in window) {
 <span id="L402" class="LineNr">402 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L403" class="LineNr">403 </span><span class="Normal">case</span> SHIFT_RIGHT: <span class="Delimiter">{</span>
 <span id="L404" class="LineNr">404 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L405" class="LineNr">405 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L406" class="LineNr">406 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L407" class="LineNr">407 </span>  <span class="Delimiter">}</span>
 <span id="L408" class="LineNr">408 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L409" class="LineNr">409 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L410" class="LineNr">410 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L411" class="LineNr">411 </span>  <span class="Delimiter">}</span>
 <span id="L412" class="LineNr">412 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L413" class="LineNr">413 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L414" class="LineNr">414 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L414" class="LineNr">414 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L415" class="LineNr">415 </span>  <span class="Delimiter">}</span>
 <span id="L416" class="LineNr">416 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L417" class="LineNr">417 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L418" class="LineNr">418 </span>    <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'shift-right' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
 <span id="L419" class="LineNr">419 </span>  <span class="Delimiter">}</span>
 <span id="L420" class="LineNr">420 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L421" class="LineNr">421 </span><span class="Delimiter">}</span>
@@ -488,9 +489,9 @@ if ('onhashchange' in window) {
 <span id="L426" class="LineNr">426 </span>  <span class="Normal">int</span> b = <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L427" class="LineNr">427 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L428" class="LineNr">428 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>b &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L429" class="LineNr">429 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;second ingredient can't be negative in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L430" class="LineNr">430 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L431" class="LineNr">431 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;second ingredient can't be negative in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L432" class="LineNr">432 </span>  <span class="Delimiter">}</span>
 <span id="L433" class="LineNr">433 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>a&gt;&gt;b<span class="Delimiter">);</span>
 <span id="L434" class="LineNr">434 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -535,20 +536,20 @@ if ('onhashchange' in window) {
 <span id="L473" class="LineNr">473 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L474" class="LineNr">474 </span><span class="Normal">case</span> AND_BITS: <span class="Delimiter">{</span>
 <span id="L475" class="LineNr">475 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L476" class="LineNr">476 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L477" class="LineNr">477 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
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+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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-<span id="L480" class="LineNr">480 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L481" class="LineNr">481 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L481" class="LineNr">481 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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-<span id="L484" class="LineNr">484 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L485" class="LineNr">485 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L484" class="LineNr">484 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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-<span id="L488" class="LineNr">488 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
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+<span id="L488" class="LineNr">488 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L489" class="LineNr">489 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
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 <span id="L491" class="LineNr">491 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
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@@ -593,20 +594,20 @@ if ('onhashchange' in window) {
 <span id="L531" class="LineNr">531 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
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-<span id="L534" class="LineNr">534 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or-bits' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L535" class="LineNr">535 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L534" class="LineNr">534 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or-bits' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L536" class="LineNr">536 </span>  <span class="Delimiter">}</span>
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-<span id="L538" class="LineNr">538 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or-bits' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L539" class="LineNr">539 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
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+<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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-<span id="L543" class="LineNr">543 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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+<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
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-<span id="L587" class="LineNr">587 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
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+<span id="L587" class="LineNr">587 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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 <span id="L589" class="LineNr">589 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L590" class="LineNr">590 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'xor-bits' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L591" class="LineNr">591 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L590" class="LineNr">590 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'xor-bits' requires number ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L591" class="LineNr">591 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L592" class="LineNr">592 </span>  <span class="Delimiter">}</span>
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-<span id="L594" class="LineNr">594 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'xor-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L595" class="LineNr">595 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L594" class="LineNr">594 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'xor-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L595" class="LineNr">595 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L596" class="LineNr">596 </span>  <span class="Delimiter">}</span>
 <span id="L597" class="LineNr">597 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L598" class="LineNr">598 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'xor-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L599" class="LineNr">599 </span>    <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L598" class="LineNr">598 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'xor-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L599" class="LineNr">599 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
 <span id="L600" class="LineNr">600 </span>  <span class="Delimiter">}</span>
 <span id="L601" class="LineNr">601 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L602" class="LineNr">602 </span><span class="Delimiter">}</span>
@@ -697,20 +698,20 @@ if ('onhashchange' in window) {
 <span id="L635" class="LineNr">635 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L636" class="LineNr">636 </span><span class="Normal">case</span> FLIP_BITS: <span class="Delimiter">{</span>
 <span id="L637" class="LineNr">637 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L638" class="LineNr">638 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L639" class="LineNr">639 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L638" class="LineNr">638 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L639" class="LineNr">639 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L640" class="LineNr">640 </span>  <span class="Delimiter">}</span>
 <span id="L641" class="LineNr">641 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L642" class="LineNr">642 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' requires a number ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L643" class="LineNr">643 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L642" class="LineNr">642 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' requires a number ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L643" class="LineNr">643 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L644" class="LineNr">644 </span>  <span class="Delimiter">}</span>
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-<span id="L646" class="LineNr">646 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L647" class="LineNr">647 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L646" class="LineNr">646 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' yields one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L647" class="LineNr">647 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L648" class="LineNr">648 </span>  <span class="Delimiter">}</span>
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-<span id="L650" class="LineNr">650 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L651" class="LineNr">651 </span>    <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L650" class="LineNr">650 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'flip-bits' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L651" class="LineNr">651 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
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 <span id="L653" class="LineNr">653 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L654" class="LineNr">654 </span><span class="Delimiter">}</span>
@@ -754,12 +755,12 @@ if ('onhashchange' in window) {
 <span id="L692" class="LineNr">692 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
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 <span id="L694" class="LineNr">694 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L695" class="LineNr">695 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'round' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L696" class="LineNr">696 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L695" class="LineNr">695 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'round' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L696" class="LineNr">696 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L697" class="LineNr">697 </span>  <span class="Delimiter">}</span>
 <span id="L698" class="LineNr">698 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L699" class="LineNr">699 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'round' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L700" class="LineNr">700 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L699" class="LineNr">699 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'round' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L700" class="LineNr">700 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L701" class="LineNr">701 </span>  <span class="Delimiter">}</span>
 <span id="L702" class="LineNr">702 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L703" class="LineNr">703 </span><span class="Delimiter">}</span>
@@ -795,12 +796,12 @@ if ('onhashchange' in window) {
 <span id="L733" class="LineNr">733 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L734" class="LineNr">734 </span><span class="Normal">case</span> TRUNCATE: <span class="Delimiter">{</span>
 <span id="L735" class="LineNr">735 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L736" class="LineNr">736 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'truncate' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L737" class="LineNr">737 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L736" class="LineNr">736 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'truncate' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L737" class="LineNr">737 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L738" class="LineNr">738 </span>  <span class="Delimiter">}</span>
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-<span id="L740" class="LineNr">740 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'truncate' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L741" class="LineNr">741 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L740" class="LineNr">740 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'truncate' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L741" class="LineNr">741 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L742" class="LineNr">742 </span>  <span class="Delimiter">}</span>
 <span id="L743" class="LineNr">743 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L744" class="LineNr">744 </span><span class="Delimiter">}</span>
@@ -830,12 +831,12 @@ if ('onhashchange' in window) {
 <span id="L768" class="LineNr">768 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L769" class="LineNr">769 </span><span class="Normal">case</span> SQUARE_ROOT: <span class="Delimiter">{</span>
 <span id="L770" class="LineNr">770 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L771" class="LineNr">771 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'square-root' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L772" class="LineNr">772 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L771" class="LineNr">771 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'square-root' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L772" class="LineNr">772 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L773" class="LineNr">773 </span>  <span class="Delimiter">}</span>
 <span id="L774" class="LineNr">774 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L775" class="LineNr">775 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'square-root' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L776" class="LineNr">776 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L775" class="LineNr">775 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'square-root' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L776" class="LineNr">776 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L777" class="LineNr">777 </span>  <span class="Delimiter">}</span>
 <span id="L778" class="LineNr">778 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L779" class="LineNr">779 </span><span class="Delimiter">}</span>
@@ -853,20 +854,20 @@ if ('onhashchange' in window) {
 <span id="L791" class="LineNr">791 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L792" class="LineNr">792 </span><span class="Normal">case</span> CHARACTER_TO_CODE: <span class="Delimiter">{</span>
 <span id="L793" class="LineNr">793 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L794" class="LineNr">794 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'character-to-code' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L795" class="LineNr">795 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L794" class="LineNr">794 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'character-to-code' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L795" class="LineNr">795 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L796" class="LineNr">796 </span>  <span class="Delimiter">}</span>
 <span id="L797" class="LineNr">797 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_character<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L798" class="LineNr">798 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'character-to-code' should be a character, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L799" class="LineNr">799 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L798" class="LineNr">798 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'character-to-code' should be a character, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L799" class="LineNr">799 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L800" class="LineNr">800 </span>  <span class="Delimiter">}</span>
 <span id="L801" class="LineNr">801 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L802" class="LineNr">802 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'character-to-code' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L803" class="LineNr">803 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L802" class="LineNr">802 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'character-to-code' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L803" class="LineNr">803 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L804" class="LineNr">804 </span>  <span class="Delimiter">}</span>
 <span id="L805" class="LineNr">805 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L806" class="LineNr">806 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of 'character-to-code' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L807" class="LineNr">807 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L806" class="LineNr">806 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of 'character-to-code' should be a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L807" class="LineNr">807 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L808" class="LineNr">808 </span>  <span class="Delimiter">}</span>
 <span id="L809" class="LineNr">809 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L810" class="LineNr">810 </span><span class="Delimiter">}</span>
@@ -874,7 +875,7 @@ if ('onhashchange' in window) {
 <span id="L812" class="LineNr">812 </span><span class="Normal">case</span> CHARACTER_TO_CODE: <span class="Delimiter">{</span>
 <span id="L813" class="LineNr">813 </span>  <span class="Normal">double</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L814" class="LineNr">814 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L815" class="LineNr">815 </span>    result += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L815" class="LineNr">815 </span>  <span class="Conceal">¦</span> result += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L816" class="LineNr">816 </span>  <span class="Delimiter">}</span>
 <span id="L817" class="LineNr">817 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L818" class="LineNr">818 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
diff --git a/html/023boolean.cc.html b/html/023boolean.cc.html
index 3ee18571..4fcfa930 100644
--- a/html/023boolean.cc.html
+++ b/html/023boolean.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.traceContains { color: #008000; }
 .muRecipe { color: #ff8700; }
-.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.traceContains { color: #008000; }
+.Special { color: #c00000; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -68,18 +69,18 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr">  7 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L8" class="LineNr">  8 </span><span class="Normal">case</span> AND: <span class="Delimiter">{</span>
 <span id="L9" class="LineNr">  9 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L10" class="LineNr"> 10 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L11" class="LineNr"> 11 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' requires boolean ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L12" class="LineNr"> 12 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L13" class="LineNr"> 13 </span>    <span class="Delimiter">}</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' requires boolean ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L12" class="LineNr"> 12 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L14" class="LineNr"> 14 </span>  <span class="Delimiter">}</span>
 <span id="L15" class="LineNr"> 15 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L16" class="LineNr"> 16 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L17" class="LineNr"> 17 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L18" class="LineNr"> 18 </span>  <span class="Delimiter">}</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L20" class="LineNr"> 20 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L21" class="LineNr"> 21 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Delimiter">}</span>
 <span id="L23" class="LineNr"> 23 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L24" class="LineNr"> 24 </span><span class="Delimiter">}</span>
@@ -87,7 +88,7 @@ if ('onhashchange' in window) {
 <span id="L26" class="LineNr"> 26 </span><span class="Normal">case</span> AND: <span class="Delimiter">{</span>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Normal">bool</span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L28" class="LineNr"> 28 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L29" class="LineNr"> 29 </span>    result = result &amp;&amp; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> result = result &amp;&amp; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L30" class="LineNr"> 30 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L31" class="LineNr"> 31 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
 <span id="L32" class="LineNr"> 32 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -126,18 +127,18 @@ if ('onhashchange' in window) {
 <span id="L65" class="LineNr"> 65 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L66" class="LineNr"> 66 </span><span class="Normal">case</span> OR: <span class="Delimiter">{</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr"> 69 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' requires boolean ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'and' requires boolean ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L72" class="LineNr"> 72 </span>  <span class="Delimiter">}</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L74" class="LineNr"> 74 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L75" class="LineNr"> 75 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Delimiter">}</span>
 <span id="L77" class="LineNr"> 77 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L78" class="LineNr"> 78 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'or' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L80" class="LineNr"> 80 </span>  <span class="Delimiter">}</span>
 <span id="L81" class="LineNr"> 81 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L82" class="LineNr"> 82 </span><span class="Delimiter">}</span>
@@ -145,7 +146,7 @@ if ('onhashchange' in window) {
 <span id="L84" class="LineNr"> 84 </span><span class="Normal">case</span> OR: <span class="Delimiter">{</span>
 <span id="L85" class="LineNr"> 85 </span>  <span class="Normal">bool</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L87" class="LineNr"> 87 </span>    result = result || ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> result = result || ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L88" class="LineNr"> 88 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L89" class="LineNr"> 89 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
 <span id="L90" class="LineNr"> 90 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -184,21 +185,21 @@ if ('onhashchange' in window) {
 <span id="L123" class="LineNr">123 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L124" class="LineNr">124 </span><span class="Normal">case</span> NOT: <span class="Delimiter">{</span>
 <span id="L125" class="LineNr">125 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L126" class="LineNr">126 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;ingredients and products should match in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;ingredients and products should match in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L128" class="LineNr">128 </span>  <span class="Delimiter">}</span>
 <span id="L129" class="LineNr">129 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L130" class="LineNr">130 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L131" class="LineNr">131 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'not' requires boolean ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L132" class="LineNr">132 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L133" class="LineNr">133 </span>    <span class="Delimiter">}</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'not' requires boolean ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Delimiter">}</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L136" class="LineNr">136 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L137" class="LineNr">137 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L138" class="LineNr">138 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'not' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L139" class="LineNr">139 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L140" class="LineNr">140 </span>    <span class="Delimiter">}</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'not' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Delimiter">}</span>
 <span id="L142" class="LineNr">142 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L143" class="LineNr">143 </span><span class="Delimiter">}</span>
@@ -206,7 +207,7 @@ if ('onhashchange' in window) {
 <span id="L145" class="LineNr">145 </span><span class="Normal">case</span> NOT: <span class="Delimiter">{</span>
 <span id="L146" class="LineNr">146 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">));</span>
 <span id="L147" class="LineNr">147 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L148" class="LineNr">148 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Delimiter">}</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L151" class="LineNr">151 </span><span class="Delimiter">}</span>
diff --git a/html/024jump.cc.html b/html/024jump.cc.html
index 2d1f7229..93f81698 100644
--- a/html/024jump.cc.html
+++ b/html/024jump.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.traceAbsent { color: #c00000; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.traceAbsent { color: #c00000; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -78,12 +79,12 @@ if ('onhashchange' in window) {
 <span id="L16" class="LineNr"> 16 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L17" class="LineNr"> 17 </span><span class="Normal">case</span> JUMP: <span class="Delimiter">{</span>
 <span id="L18" class="LineNr"> 18 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L19" class="LineNr"> 19 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L20" class="LineNr"> 20 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L21" class="LineNr"> 21 </span>  <span class="Delimiter">}</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L23" class="LineNr"> 23 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'jump' should be a label or offset, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L24" class="LineNr"> 24 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'jump' should be a label or offset, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Delimiter">}</span>
 <span id="L26" class="LineNr"> 26 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L27" class="LineNr"> 27 </span><span class="Delimiter">}</span>
@@ -103,7 +104,7 @@ if ('onhashchange' in window) {
 <span id="L41" class="LineNr"> 41 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L42" class="LineNr"> 42 </span>  jump <span class="Constant">1:offset</span>  <span class="Comment"># 0 -+</span>
 <span id="L43" class="LineNr"> 43 </span>  jump <span class="Constant">3:offset</span>  <span class="Comment">#    |   +-+ 1</span>
-<span id="L44" class="LineNr"> 44 </span>                 <span class="Comment">#   \/  /\ |</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Comment">#   \/  /\ |</span>
 <span id="L45" class="LineNr"> 45 </span>  jump <span class="Constant">-2:offset</span> <span class="Comment">#  2 +--&gt;+ |</span>
 <span id="L46" class="LineNr"> 46 </span>]                <span class="Comment">#         \/ 3</span>
 <span id="L47" class="LineNr"> 47 </span><span class="traceContains">+run: jump {1: &quot;offset&quot;}</span>
@@ -117,16 +118,16 @@ if ('onhashchange' in window) {
 <span id="L55" class="LineNr"> 55 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L56" class="LineNr"> 56 </span><span class="Normal">case</span> JUMP_IF: <span class="Delimiter">{</span>
 <span id="L57" class="LineNr"> 57 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L58" class="LineNr"> 58 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L59" class="LineNr"> 59 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Delimiter">}</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires a boolean for its first ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires a boolean for its first ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Delimiter">}</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires a label or offset for its second ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-if' requires a label or offset for its second ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Delimiter">}</span>
 <span id="L69" class="LineNr"> 69 </span>  <span class="Comment">// End JUMP_IF Checks</span>
 <span id="L70" class="LineNr"> 70 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -135,8 +136,8 @@ if ('onhashchange' in window) {
 <span id="L73" class="LineNr"> 73 </span><span class="Normal">case</span> JUMP_IF: <span class="Delimiter">{</span>
 <span id="L74" class="LineNr"> 74 </span>  assert<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>initialized<span class="Delimiter">);</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L76" class="LineNr"> 76 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-if fell through&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L77" class="LineNr"> 77 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-if fell through&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">}</span>
 <span id="L79" class="LineNr"> 79 </span>  current_step_index<span class="Delimiter">()</span> += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>+<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L80" class="LineNr"> 80 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jumping to <a href='010vm.cc.html#L32'>instruction</a> &quot;</span> &lt;&lt; current_step_index<span class="Delimiter">()</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -170,16 +171,16 @@ if ('onhashchange' in window) {
 <span id="L108" class="LineNr">108 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L109" class="LineNr">109 </span><span class="Normal">case</span> JUMP_UNLESS: <span class="Delimiter">{</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L111" class="LineNr">111 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L112" class="LineNr">112 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Delimiter">}</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L115" class="LineNr">115 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires a boolean for its first ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L116" class="LineNr">116 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires a boolean for its first ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Delimiter">}</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires a label or offset for its second ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump-unless' requires a label or offset for its second ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Comment">// End JUMP_UNLESS Checks</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -188,8 +189,8 @@ if ('onhashchange' in window) {
 <span id="L126" class="LineNr">126 </span><span class="Normal">case</span> JUMP_UNLESS: <span class="Delimiter">{</span>
 <span id="L127" class="LineNr">127 </span>  assert<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>initialized<span class="Delimiter">);</span>
 <span id="L128" class="LineNr">128 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L129" class="LineNr">129 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-unless fell through&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L130" class="LineNr">130 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump-unless fell through&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L131" class="LineNr">131 </span>  <span class="Delimiter">}</span>
 <span id="L132" class="LineNr">132 </span>  current_step_index<span class="Delimiter">()</span> += ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>+<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L133" class="LineNr">133 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jumping to <a href='010vm.cc.html#L32'>instruction</a> &quot;</span> &lt;&lt; current_step_index<span class="Delimiter">()</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
diff --git a/html/025compare.cc.html b/html/025compare.cc.html
index b142cc30..5a647d15 100644
--- a/html/025compare.cc.html
+++ b/html/025compare.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.traceContains { color: #008000; }
 .muRecipe { color: #ff8700; }
-.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.traceContains { color: #008000; }
+.Special { color: #c00000; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -68,23 +69,23 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr">  7 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L8" class="LineNr">  8 </span><span class="Normal">case</span> EQUAL: <span class="Delimiter">{</span>
 <span id="L9" class="LineNr">  9 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L10" class="LineNr"> 10 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L11" class="LineNr"> 11 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L12" class="LineNr"> 12 </span>  <span class="Delimiter">}</span>
 <span id="L13" class="LineNr"> 13 </span>  <span class="Normal">const</span> reagent&amp; exemplar = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L14" class="LineNr"> 14 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip exemplar</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L15" class="LineNr"> 15 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> exemplar<span class="Delimiter">)</span> &amp;&amp; !types_match<span class="Delimiter">(</span>exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L16" class="LineNr"> 16 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' expects ingredients to be all of the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L17" class="LineNr"> 17 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L18" class="LineNr"> 18 </span>    <span class="Delimiter">}</span>
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> exemplar<span class="Delimiter">)</span> &amp;&amp; !types_match<span class="Delimiter">(</span>exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' expects ingredients to be all of the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="Delimiter">}</span>
 <span id="L20" class="LineNr"> 20 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L21" class="LineNr"> 21 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L22" class="LineNr"> 22 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L23" class="LineNr"> 23 </span>  <span class="Delimiter">}</span>
 <span id="L24" class="LineNr"> 24 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L25" class="LineNr"> 25 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L26" class="LineNr"> 26 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Delimiter">}</span>
 <span id="L28" class="LineNr"> 28 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L29" class="LineNr"> 29 </span><span class="Delimiter">}</span>
@@ -93,10 +94,10 @@ if ('onhashchange' in window) {
 <span id="L32" class="LineNr"> 32 </span>  vector&lt;<span class="Normal">double</span>&gt;&amp; exemplar = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L33" class="LineNr"> 33 </span>  <span class="Normal">bool</span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip exemplar</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L35" class="LineNr"> 35 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!equal<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> exemplar<span class="Delimiter">.</span>begin<span class="Delimiter">()))</span> <span class="Delimiter">{</span>
-<span id="L36" class="LineNr"> 36 </span>      result = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L37" class="LineNr"> 37 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L38" class="LineNr"> 38 </span>    <span class="Delimiter">}</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!equal<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> exemplar<span class="Delimiter">.</span>begin<span class="Delimiter">()))</span> <span class="Delimiter">{</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Delimiter">}</span>
 <span id="L40" class="LineNr"> 40 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L41" class="LineNr"> 41 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -142,21 +143,21 @@ if ('onhashchange' in window) {
 <span id="L81" class="LineNr"> 81 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L82" class="LineNr"> 82 </span><span class="Normal">case</span> NOT_EQUAL: <span class="Delimiter">{</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L84" class="LineNr"> 84 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' needs two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L85" class="LineNr"> 85 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' needs two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Delimiter">}</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Normal">const</span> reagent&amp; exemplar = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> exemplar<span class="Delimiter">)</span> &amp;&amp; !types_match<span class="Delimiter">(</span>exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' expects ingredients to be all of the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L90" class="LineNr"> 90 </span>    <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' expects ingredients to be all of the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Delimiter">}</span>
 <span id="L92" class="LineNr"> 92 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L93" class="LineNr"> 93 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L94" class="LineNr"> 94 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Delimiter">}</span>
 <span id="L96" class="LineNr"> 96 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L97" class="LineNr"> 97 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L98" class="LineNr"> 98 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L99" class="LineNr"> 99 </span>  <span class="Delimiter">}</span>
 <span id="L100" class="LineNr">100 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L101" class="LineNr">101 </span><span class="Delimiter">}</span>
@@ -196,22 +197,22 @@ if ('onhashchange' in window) {
 <span id="L135" class="LineNr">135 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L136" class="LineNr">136 </span><span class="Normal">case</span> GREATER_THAN: <span class="Delimiter">{</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L138" class="LineNr">138 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L139" class="LineNr">139 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L140" class="LineNr">140 </span>  <span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L142" class="LineNr">142 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L143" class="LineNr">143 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L144" class="LineNr">144 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L145" class="LineNr">145 </span>    <span class="Delimiter">}</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Delimiter">}</span>
 <span id="L147" class="LineNr">147 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L148" class="LineNr">148 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L149" class="LineNr">149 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Delimiter">}</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L152" class="LineNr">152 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L153" class="LineNr">153 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-than' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L154" class="LineNr">154 </span>  <span class="Delimiter">}</span>
 <span id="L155" class="LineNr">155 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
@@ -219,9 +220,9 @@ if ('onhashchange' in window) {
 <span id="L158" class="LineNr">158 </span><span class="Normal">case</span> GREATER_THAN: <span class="Delimiter">{</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Normal">bool</span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/**/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L161" class="LineNr">161 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L162" class="LineNr">162 </span>      result = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L163" class="LineNr">163 </span>    <span class="Delimiter">}</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Delimiter">}</span>
 <span id="L165" class="LineNr">165 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L166" class="LineNr">166 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -263,22 +264,22 @@ if ('onhashchange' in window) {
 <span id="L202" class="LineNr">202 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L203" class="LineNr">203 </span><span class="Normal">case</span> LESSER_THAN: <span class="Delimiter">{</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L205" class="LineNr">205 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L206" class="LineNr">206 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Delimiter">}</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L209" class="LineNr">209 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L210" class="LineNr">210 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L211" class="LineNr">211 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L212" class="LineNr">212 </span>    <span class="Delimiter">}</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Delimiter">}</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L215" class="LineNr">215 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Delimiter">}</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L219" class="LineNr">219 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L220" class="LineNr">220 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-than' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Delimiter">}</span>
 <span id="L222" class="LineNr">222 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L223" class="LineNr">223 </span><span class="Delimiter">}</span>
@@ -286,9 +287,9 @@ if ('onhashchange' in window) {
 <span id="L225" class="LineNr">225 </span><span class="Normal">case</span> LESSER_THAN: <span class="Delimiter">{</span>
 <span id="L226" class="LineNr">226 </span>  <span class="Normal">bool</span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L227" class="LineNr">227 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/**/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L228" class="LineNr">228 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt;= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L229" class="LineNr">229 </span>      result = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L230" class="LineNr">230 </span>    <span class="Delimiter">}</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt;= ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L231" class="LineNr">231 </span>  <span class="Delimiter">}</span>
 <span id="L232" class="LineNr">232 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L233" class="LineNr">233 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -330,22 +331,22 @@ if ('onhashchange' in window) {
 <span id="L269" class="LineNr">269 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L270" class="LineNr">270 </span><span class="Normal">case</span> GREATER_OR_EQUAL: <span class="Delimiter">{</span>
 <span id="L271" class="LineNr">271 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L272" class="LineNr">272 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L273" class="LineNr">273 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Delimiter">}</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L276" class="LineNr">276 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L277" class="LineNr">277 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L278" class="LineNr">278 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L279" class="LineNr">279 </span>    <span class="Delimiter">}</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L280" class="LineNr">280 </span>  <span class="Delimiter">}</span>
 <span id="L281" class="LineNr">281 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L282" class="LineNr">282 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L283" class="LineNr">283 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L284" class="LineNr">284 </span>  <span class="Delimiter">}</span>
 <span id="L285" class="LineNr">285 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L286" class="LineNr">286 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L287" class="LineNr">287 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L288" class="LineNr">288 </span>  <span class="Delimiter">}</span>
 <span id="L289" class="LineNr">289 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L290" class="LineNr">290 </span><span class="Delimiter">}</span>
@@ -353,9 +354,9 @@ if ('onhashchange' in window) {
 <span id="L292" class="LineNr">292 </span><span class="Normal">case</span> GREATER_OR_EQUAL: <span class="Delimiter">{</span>
 <span id="L293" class="LineNr">293 </span>  <span class="Normal">bool</span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L294" class="LineNr">294 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/**/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L295" class="LineNr">295 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L296" class="LineNr">296 </span>      result = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L297" class="LineNr">297 </span>    <span class="Delimiter">}</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L298" class="LineNr">298 </span>  <span class="Delimiter">}</span>
 <span id="L299" class="LineNr">299 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L300" class="LineNr">300 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -405,22 +406,22 @@ if ('onhashchange' in window) {
 <span id="L344" class="LineNr">344 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L345" class="LineNr">345 </span><span class="Normal">case</span> LESSER_OR_EQUAL: <span class="Delimiter">{</span>
 <span id="L346" class="LineNr">346 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L347" class="LineNr">347 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-or-equal' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L348" class="LineNr">348 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-or-equal' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L348" class="LineNr">348 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L349" class="LineNr">349 </span>  <span class="Delimiter">}</span>
 <span id="L350" class="LineNr">350 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L351" class="LineNr">351 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L352" class="LineNr">352 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-or-equal' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L353" class="LineNr">353 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L354" class="LineNr">354 </span>    <span class="Delimiter">}</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'lesser-or-equal' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L354" class="LineNr">354 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L355" class="LineNr">355 </span>  <span class="Delimiter">}</span>
 <span id="L356" class="LineNr">356 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L357" class="LineNr">357 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L358" class="LineNr">358 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L359" class="LineNr">359 </span>  <span class="Delimiter">}</span>
 <span id="L360" class="LineNr">360 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L361" class="LineNr">361 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L362" class="LineNr">362 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'greater-or-equal' should yield a boolean, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L363" class="LineNr">363 </span>  <span class="Delimiter">}</span>
 <span id="L364" class="LineNr">364 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L365" class="LineNr">365 </span><span class="Delimiter">}</span>
@@ -428,9 +429,9 @@ if ('onhashchange' in window) {
 <span id="L367" class="LineNr">367 </span><span class="Normal">case</span> LESSER_OR_EQUAL: <span class="Delimiter">{</span>
 <span id="L368" class="LineNr">368 </span>  <span class="Normal">bool</span> result = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L369" class="LineNr">369 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/**/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L370" class="LineNr">370 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L371" class="LineNr">371 </span>      result = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L372" class="LineNr">372 </span>    <span class="Delimiter">}</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L373" class="LineNr">373 </span>  <span class="Delimiter">}</span>
 <span id="L374" class="LineNr">374 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L375" class="LineNr">375 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -480,22 +481,22 @@ if ('onhashchange' in window) {
 <span id="L419" class="LineNr">419 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L420" class="LineNr">420 </span><span class="Normal">case</span> MAX: <span class="Delimiter">{</span>
 <span id="L421" class="LineNr">421 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L422" class="LineNr">422 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L423" class="LineNr">423 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L424" class="LineNr">424 </span>  <span class="Delimiter">}</span>
 <span id="L425" class="LineNr">425 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L426" class="LineNr">426 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L427" class="LineNr">427 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L428" class="LineNr">428 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L429" class="LineNr">429 </span>    <span class="Delimiter">}</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L430" class="LineNr">430 </span>  <span class="Delimiter">}</span>
 <span id="L431" class="LineNr">431 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L432" class="LineNr">432 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L433" class="LineNr">433 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L434" class="LineNr">434 </span>  <span class="Delimiter">}</span>
 <span id="L435" class="LineNr">435 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L436" class="LineNr">436 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L437" class="LineNr">437 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'max' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L437" class="LineNr">437 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L438" class="LineNr">438 </span>  <span class="Delimiter">}</span>
 <span id="L439" class="LineNr">439 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L440" class="LineNr">440 </span><span class="Delimiter">}</span>
@@ -503,9 +504,9 @@ if ('onhashchange' in window) {
 <span id="L442" class="LineNr">442 </span><span class="Normal">case</span> MAX: <span class="Delimiter">{</span>
 <span id="L443" class="LineNr">443 </span>  <span class="Normal">int</span> result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L444" class="LineNr">444 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/**/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L445" class="LineNr">445 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt; result<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L446" class="LineNr">446 </span>      result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L447" class="LineNr">447 </span>    <span class="Delimiter">}</span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt; result<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L448" class="LineNr">448 </span>  <span class="Delimiter">}</span>
 <span id="L449" class="LineNr">449 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L450" class="LineNr">450 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -519,22 +520,22 @@ if ('onhashchange' in window) {
 <span id="L458" class="LineNr">458 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L459" class="LineNr">459 </span><span class="Normal">case</span> MIN: <span class="Delimiter">{</span>
 <span id="L460" class="LineNr">460 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L461" class="LineNr">461 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L462" class="LineNr">462 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' needs at least two ingredients to compare in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L463" class="LineNr">463 </span>  <span class="Delimiter">}</span>
 <span id="L464" class="LineNr">464 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L465" class="LineNr">465 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L466" class="LineNr">466 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L467" class="LineNr">467 </span>      <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
-<span id="L468" class="LineNr">468 </span>    <span class="Delimiter">}</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' can only compare numbers; got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_checking_instruction<span class="Delimiter">;</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L469" class="LineNr">469 </span>  <span class="Delimiter">}</span>
 <span id="L470" class="LineNr">470 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L471" class="LineNr">471 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L472" class="LineNr">472 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' yields exactly one product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L473" class="LineNr">473 </span>  <span class="Delimiter">}</span>
 <span id="L474" class="LineNr">474 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L475" class="LineNr">475 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L476" class="LineNr">476 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'min' should yield a number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L477" class="LineNr">477 </span>  <span class="Delimiter">}</span>
 <span id="L478" class="LineNr">478 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L479" class="LineNr">479 </span><span class="Delimiter">}</span>
@@ -542,9 +543,9 @@ if ('onhashchange' in window) {
 <span id="L481" class="LineNr">481 </span><span class="Normal">case</span> MIN: <span class="Delimiter">{</span>
 <span id="L482" class="LineNr">482 </span>  <span class="Normal">int</span> result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L483" class="LineNr">483 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/**/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L484" class="LineNr">484 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt; result<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L485" class="LineNr">485 </span>      result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L486" class="LineNr">486 </span>    <span class="Delimiter">}</span>
+<span id="L484" class="LineNr">484 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt; result<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L487" class="LineNr">487 </span>  <span class="Delimiter">}</span>
 <span id="L488" class="LineNr">488 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L489" class="LineNr">489 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
diff --git a/html/026call.cc.html b/html/026call.cc.html
index b07855e3..fe120753 100644
--- a/html/026call.cc.html
+++ b/html/026call.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .SalientComment { color: #00ffff; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -100,12 +101,12 @@ if ('onhashchange' in window) {
 <span id="L38" class="LineNr"> 38 </span>  <span class="Normal">int</span> running_step_index<span class="Delimiter">;</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Comment">// End call Fields</span>
 <span id="L40" class="LineNr"> 40 </span>  call<span class="Delimiter">(</span><a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L41" class="LineNr"> 41 </span>    running_recipe = r<span class="Delimiter">;</span>
-<span id="L42" class="LineNr"> 42 </span>    running_step_index = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Comment">// End call Constructor</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> running_recipe = r<span class="Delimiter">;</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> running_step_index = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Comment">// End call Constructor</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Delimiter">}</span>
 <span id="L45" class="LineNr"> 45 </span>  ~call<span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L46" class="LineNr"> 46 </span>    <span class="Comment">// End call Destructor</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Comment">// End call Destructor</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span><span class="Delimiter">};</span>
 <span id="L49" class="LineNr"> 49 </span><span class="Normal">typedef</span> list&lt;call&gt; call_stack<span class="Delimiter">;</span>
@@ -121,9 +122,9 @@ if ('onhashchange' in window) {
 <span id="L59" class="LineNr"> 59 </span><span class="Delimiter">:(code)</span>
 <span id="L60" class="LineNr"> 60 </span>routine::routine<span class="Delimiter">(</span><a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>    ++Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
-<span id="L63" class="LineNr"> 63 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new routine; incrementing callstack depth to &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L64" class="LineNr"> 64 </span>    assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> ++Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new routine; incrementing callstack depth to &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Delimiter">}</span>
 <span id="L66" class="LineNr"> 66 </span>  calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>r<span class="Delimiter">));</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Comment">// End routine Constructor</span>
@@ -171,15 +172,15 @@ if ('onhashchange' in window) {
 <span id="L109" class="LineNr">109 </span><span class="Normal">default</span>: <span class="Delimiter">{</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Normal">const</span> instruction&amp; call_instruction = current_instruction<span class="Delimiter">();</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Recipe<span class="Delimiter">.</span>find<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">)</span> == Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>  <span class="Comment">// duplicate from Checks</span>
-<span id="L112" class="LineNr">112 </span>    <span class="Comment">// stop running this instruction immediately</span>
-<span id="L113" class="LineNr">113 </span>    ++current_step_index<span class="Delimiter">();</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Comment">// stop running this instruction immediately</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> ++current_step_index<span class="Delimiter">();</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
 <span id="L115" class="LineNr">115 </span>  <span class="Delimiter">}</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Comment">// not a primitive; look up the book of recipes</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L118" class="LineNr">118 </span>    ++Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
-<span id="L119" class="LineNr">119 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;incrementing callstack depth to &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>    assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> ++Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;incrementing callstack depth to &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>operation<span class="Delimiter">));</span>
 <span id="L123" class="LineNr">123 </span>  finish_call_housekeeping<span class="Delimiter">(</span>call_instruction<span class="Delimiter">,</span> ingredients<span class="Delimiter">);</span>
@@ -223,9 +224,9 @@ if ('onhashchange' in window) {
 <span id="L161" class="LineNr">161 </span><span class="Normal">while</span> <span class="Delimiter">(</span>current_step_index<span class="Delimiter">()</span> &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>steps<span class="Delimiter">()))</span> <span class="Delimiter">{</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Comment">// Falling Through End Of Recipe</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;fall-through: exiting &quot;</span> &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;; decrementing callstack depth from &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L165" class="LineNr">165 </span>    --Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
-<span id="L166" class="LineNr">166 </span>    assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;fall-through: exiting &quot;</span> &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;; decrementing callstack depth from &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> --Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L167" class="LineNr">167 </span>  <span class="Delimiter">}</span>
 <span id="L168" class="LineNr">168 </span>  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
diff --git a/html/027call_ingredient.cc.html b/html/027call_ingredient.cc.html
index f6580ffa..d94e91e1 100644
--- a/html/027call_ingredient.cc.html
+++ b/html/027call_ingredient.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -104,8 +105,8 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr"> 43 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L44" class="LineNr"> 44 </span><span class="Normal">case</span> NEXT_INGREDIENT: <span class="Delimiter">{</span>
 <span id="L45" class="LineNr"> 45 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L46" class="LineNr"> 46 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'next-ingredient' didn't expect any ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L47" class="LineNr"> 47 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'next-ingredient' didn't expect any ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Delimiter">}</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L50" class="LineNr"> 50 </span><span class="Delimiter">}</span>
@@ -113,33 +114,33 @@ if ('onhashchange' in window) {
 <span id="L52" class="LineNr"> 52 </span><span class="Normal">case</span> NEXT_INGREDIENT: <span class="Delimiter">{</span>
 <span id="L53" class="LineNr"> 53 </span>  assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
 <span id="L54" class="LineNr"> 54 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L55" class="LineNr"> 55 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L56" class="LineNr"> 56 </span>    <span class="Comment">// End Preprocess NEXT_INGREDIENT product</span>
-<span id="L57" class="LineNr"> 57 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">()</span> == <span class="Constant">&quot;main&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L58" class="LineNr"> 58 </span>      <span class="Comment">// no ingredient types since the call might be implicit; assume ingredients are always strings</span>
-<span id="L59" class="LineNr"> 59 </span>      <span class="Comment">// todo: how to test this?</span>
-<span id="L60" class="LineNr"> 60 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>product<span class="Delimiter">))</span>
-<span id="L61" class="LineNr"> 61 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;main: wrong type for ingredient '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L62" class="LineNr"> 62 </span>    <span class="Delimiter">}</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span>
-<span id="L64" class="LineNr"> 64 </span>                              current_call<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L65" class="LineNr"> 65 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;wrong type for ingredient '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L66" class="LineNr"> 66 </span>      <span class="Comment">// End next-ingredient Type Mismatch Error</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Delimiter">}</span>
-<span id="L68" class="LineNr"> 68 </span>    products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
-<span id="L69" class="LineNr"> 69 </span>        current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
-<span id="L70" class="LineNr"> 70 </span>    assert<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
-<span id="L71" class="LineNr"> 71 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>    ++current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Preprocess NEXT_INGREDIENT product</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">()</span> == <span class="Constant">&quot;main&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// no ingredient types since the call might be implicit; assume ingredients are always strings</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// todo: how to test this?</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>product<span class="Delimiter">))</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;main: wrong type for ingredient '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>         current_call<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;wrong type for ingredient '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End next-ingredient Type Mismatch Error</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> ++current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Delimiter">}</span>
 <span id="L74" class="LineNr"> 74 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L75" class="LineNr"> 75 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &lt; <span class="Constant">2</span><span class="Delimiter">)</span>
-<span id="L76" class="LineNr"> 76 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;no ingredient to save in '&quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L77" class="LineNr"> 77 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L78" class="LineNr"> 78 </span>    products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Comment">// pad the first product with sufficient zeros to match its type</span>
-<span id="L80" class="LineNr"> 80 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>resize<span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
-<span id="L81" class="LineNr"> 81 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &lt; <span class="Constant">2</span><span class="Delimiter">)</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;no ingredient to save in '&quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Comment">// pad the first product with sufficient zeros to match its type</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>resize<span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Delimiter">}</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L84" class="LineNr"> 84 </span><span class="Delimiter">}</span>
@@ -201,31 +202,31 @@ if ('onhashchange' in window) {
 <span id="L140" class="LineNr">140 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L141" class="LineNr">141 </span><span class="Normal">case</span> INGREDIENT: <span class="Delimiter">{</span>
 <span id="L142" class="LineNr">142 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L143" class="LineNr">143 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'ingredient' expects exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L144" class="LineNr">144 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'ingredient' expects exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Delimiter">}</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L147" class="LineNr">147 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'ingredient' expects a literal ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L148" class="LineNr">148 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'ingredient' expects a literal ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Delimiter">}</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L151" class="LineNr">151 </span><span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L153" class="LineNr">153 </span><span class="Normal">case</span> INGREDIENT: <span class="Delimiter">{</span>
 <span id="L154" class="LineNr">154 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L155" class="LineNr">155 </span>    current_call<span class="Delimiter">().</span>next_ingredient_to_process = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L156" class="LineNr">156 </span>    products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
-<span id="L157" class="LineNr">157 </span>        current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
-<span id="L158" class="LineNr">158 </span>    assert<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
-<span id="L159" class="LineNr">159 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L160" class="LineNr">160 </span>    ++current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> current_call<span class="Delimiter">().</span>next_ingredient_to_process = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> ++current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
 <span id="L161" class="LineNr">161 </span>  <span class="Delimiter">}</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L163" class="LineNr">163 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>      products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L165" class="LineNr">165 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// todo: will fail noisily if we try to read a compound value</span>
-<span id="L166" class="LineNr">166 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Delimiter">}</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// todo: will fail noisily if we try to read a compound value</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Delimiter">}</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L170" class="LineNr">170 </span><span class="Delimiter">}</span>
@@ -235,17 +236,17 @@ if ('onhashchange' in window) {
 <span id="L174" class="LineNr">174 </span><span class="Normal">bool</span> <a href='027call_ingredient.cc.html#L174'>is_mu_text</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Comment">// End Preprocess is_mu_text(reagent x)</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Identifier">return</span> x<span class="Delimiter">.</span>type
-<span id="L177" class="LineNr">177 </span>      &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom
-<span id="L178" class="LineNr">178 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom
-<span id="L179" class="LineNr">179 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">)</span>
-<span id="L180" class="LineNr">180 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right
-<span id="L181" class="LineNr">181 </span>      &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom
-<span id="L182" class="LineNr">182 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom
-<span id="L183" class="LineNr">183 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">)</span>
-<span id="L184" class="LineNr">184 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right
-<span id="L185" class="LineNr">185 </span>      &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom
-<span id="L186" class="LineNr">186 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">)</span>
-<span id="L187" class="LineNr">187 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">)</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">)</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">)</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L188" class="LineNr">188 </span><span class="Delimiter">}</span>
 </pre>
 </body>
diff --git a/html/028call_return.cc.html b/html/028call_return.cc.html
index f092b76d..7431dbdf 100644
--- a/html/028call_return.cc.html
+++ b/html/028call_return.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.traceContains { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -98,18 +99,18 @@ if ('onhashchange' in window) {
 <span id="L37" class="LineNr"> 37 </span><span class="Normal">case</span> RETURN: <span class="Delimiter">{</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Comment">// Starting Reply</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L40" class="LineNr"> 40 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;: decrementing callstack depth from &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L41" class="LineNr"> 41 </span>    --Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
-<span id="L42" class="LineNr"> 42 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L43" class="LineNr"> 43 </span>      Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
-<span id="L44" class="LineNr"> 44 </span>      <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Delimiter">}</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;: decrementing callstack depth from &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> --Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L46" class="LineNr"> 46 </span>  <span class="Delimiter">}</span>
 <span id="L47" class="LineNr"> 47 </span>  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Comment">// just in case 'main' returns a value, drop it for now</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
 <span id="L50" class="LineNr"> 50 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L51" class="LineNr"> 51 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;result &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;result &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Comment">// make return products available to caller</span>
 <span id="L53" class="LineNr"> 53 </span>  copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
 <span id="L54" class="LineNr"> 54 </span>  <span class="Comment">// End Reply</span>
@@ -125,50 +126,50 @@ if ('onhashchange' in window) {
 <span id="L64" class="LineNr"> 64 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L65" class="LineNr"> 65 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- check types of return instructions in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L66" class="LineNr"> 66 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Normal">const</span> instruction&amp; caller_instruction = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L69" class="LineNr"> 69 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L70" class="LineNr"> 70 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>operation &lt; <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> caller_instruction<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L73" class="LineNr"> 73 </span>      <span class="Normal">const</span> instruction&amp; return_inst = callee<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L74" class="LineNr"> 74 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>operation != RETURN<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L75" class="LineNr"> 75 </span>      <span class="Comment">// check types with the caller</span>
-<span id="L76" class="LineNr"> 76 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L77" class="LineNr"> 77 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too few values returned from &quot;</span> &lt;&lt; callee<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L78" class="LineNr"> 78 </span>        <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L79" class="LineNr"> 79 </span>      <span class="Delimiter">}</span>
-<span id="L80" class="LineNr"> 80 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L81" class="LineNr"> 81 </span>        reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> lhs = return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L82" class="LineNr"> 82 </span>        reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> rhs = caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L83" class="LineNr"> 83 </span>        <span class="Comment">// End Check RETURN Copy(lhs, rhs)</span>
-<span id="L84" class="LineNr"> 84 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>rhs<span class="Delimiter">,</span> lhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L85" class="LineNr"> 85 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; return_inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; ingredient '&quot;</span> &lt;&lt; lhs<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' can't be saved in '&quot;</span> &lt;&lt; rhs<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L86" class="LineNr"> 86 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  ['&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>lhs<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' vs '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>rhs<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;']</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L87" class="LineNr"> 87 </span>          <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
-<span id="L88" class="LineNr"> 88 </span>        <span class="Delimiter">}</span>
-<span id="L89" class="LineNr"> 89 </span>      <span class="Delimiter">}</span>
-<span id="L90" class="LineNr"> 90 </span>      <span class="Comment">// check that any return ingredients with /same-as-ingredient connect up</span>
-<span id="L91" class="LineNr"> 91 </span>      <span class="Comment">// the corresponding ingredient and product in the caller.</span>
-<span id="L92" class="LineNr"> 92 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L93" class="LineNr"> 93 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L94" class="LineNr"> 94 </span>          string_tree* tmp = property<span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">);</span>
-<span id="L95" class="LineNr"> 95 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>!tmp || !tmp<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'same-as-ingredient' metadata should take exactly one value in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>return_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L97" class="LineNr"> 97 </span>            <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
-<span id="L98" class="LineNr"> 98 </span>          <span class="Delimiter">}</span>
-<span id="L99" class="LineNr"> 99 </span>          <span class="Normal">int</span> ingredient_index = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>tmp<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
-<span id="L100" class="LineNr">100 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L101" class="LineNr">101 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too few ingredients in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L102" class="LineNr">102 </span>            <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
-<span id="L103" class="LineNr">103 </span>          <span class="Delimiter">}</span>
-<span id="L104" class="LineNr">104 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &amp;&amp; !is_literal<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">))</span> &amp;&amp; caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name != caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L105" class="LineNr">105 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' should write to '&quot;</span> &lt;&lt; caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' rather than '&quot;</span> &lt;&lt; caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L106" class="LineNr">106 </span>          <span class="Delimiter">}</span>
-<span id="L107" class="LineNr">107 </span>        <span class="Delimiter">}</span>
-<span id="L108" class="LineNr">108 </span>      <span class="Delimiter">}</span>
-<span id="L109" class="LineNr">109 </span>      <span class="Normal">finish_return_check</span>:<span class="Delimiter">;</span>
-<span id="L110" class="LineNr">110 </span>    <span class="Delimiter">}</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; caller_instruction = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>operation &lt; <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> caller_instruction<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; return_inst = callee<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>operation != RETURN<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// check types with the caller</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">)</span> &gt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too few values returned from &quot;</span> &lt;&lt; callee<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> lhs = return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> rhs = caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Check RETURN Copy(lhs, rhs)</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>rhs<span class="Delimiter">,</span> lhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; return_inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; ingredient '&quot;</span> &lt;&lt; lhs<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' can't be saved in '&quot;</span> &lt;&lt; rhs<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  ['&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>lhs<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' vs '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>rhs<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;']</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// check that any return ingredients with /same-as-ingredient connect up</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// the corresponding ingredient and product in the caller.</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> string_tree* tmp = property<span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">);</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!tmp || !tmp<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'same-as-ingredient' metadata should take exactly one value in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>return_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> ingredient_index = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>tmp<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too few ingredients in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &amp;&amp; !is_literal<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">))</span> &amp;&amp; caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name != caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' should write to '&quot;</span> &lt;&lt; caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' rather than '&quot;</span> &lt;&lt; caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">finish_return_check</span>:<span class="Delimiter">;</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Delimiter">}</span>
 <span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
 <span id="L113" class="LineNr">113 </span>
@@ -220,13 +221,13 @@ if ('onhashchange' in window) {
 <span id="L159" class="LineNr">159 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">&quot;[]&quot;</span><span class="Delimiter">;</span>
 <span id="L160" class="LineNr">160 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L161" class="LineNr">161 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L162" class="LineNr">162 </span>    out &lt;&lt; no_scientific<span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
-<span id="L163" class="LineNr">163 </span>    <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> out &lt;&lt; no_scientific<span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Delimiter">}</span>
 <span id="L165" class="LineNr">165 </span>  out &lt;&lt; <span class="Constant">&quot;[&quot;</span><span class="Delimiter">;</span>
 <span id="L166" class="LineNr">166 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
-<span id="L168" class="LineNr">168 </span>    out &lt;&lt; no_scientific<span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">0</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">&quot;, &quot;</span><span class="Delimiter">;</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> out &lt;&lt; no_scientific<span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Delimiter">}</span>
 <span id="L170" class="LineNr">170 </span>  out &lt;&lt; <span class="Constant">&quot;]&quot;</span><span class="Delimiter">;</span>
 <span id="L171" class="LineNr">171 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
diff --git a/html/029tools.cc.html b/html/029tools.cc.html
index 0d7f7cf1..c6378911 100644
--- a/html/029tools.cc.html
+++ b/html/029tools.cc.html
@@ -16,17 +16,18 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
-.SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.SalientComment { color: #00ffff; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -76,16 +77,16 @@ if ('onhashchange' in window) {
 <span id="L13" class="LineNr"> 13 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L14" class="LineNr"> 14 </span><span class="Normal">case</span> TRACE: <span class="Delimiter">{</span>
 <span id="L15" class="LineNr"> 15 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt; <span class="Constant">3</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L16" class="LineNr"> 16 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'trace' takes three or more ingredients rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L17" class="LineNr"> 17 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'trace' takes three or more ingredients rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L18" class="LineNr"> 18 </span>  <span class="Delimiter">}</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L20" class="LineNr"> 20 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'trace' should be a number (depth), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L21" class="LineNr"> 21 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'trace' should be a number (depth), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Delimiter">}</span>
 <span id="L23" class="LineNr"> 23 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L24" class="LineNr"> 24 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'trace' should be a literal string (label), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L25" class="LineNr"> 25 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'trace' should be a literal string (label), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L26" class="LineNr"> 26 </span>  <span class="Delimiter">}</span>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L28" class="LineNr"> 28 </span><span class="Delimiter">}</span>
@@ -95,8 +96,8 @@ if ('onhashchange' in window) {
 <span id="L32" class="LineNr"> 32 </span>  string label = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
 <span id="L33" class="LineNr"> 33 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">2</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L35" class="LineNr"> 35 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">2</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L36" class="LineNr"> 36 </span>    out &lt;&lt; inspect<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt; <span class="Constant">2</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> out &lt;&lt; inspect<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L37" class="LineNr"> 37 </span>  <span class="Delimiter">}</span>
 <span id="L38" class="LineNr"> 38 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span>depth<span class="Delimiter">,</span> label<span class="Delimiter">)</span> &lt;&lt; out<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -116,8 +117,8 @@ if ('onhashchange' in window) {
 <span id="L53" class="LineNr"> 53 </span><span class="Normal">case</span> STASH: <span class="Delimiter">{</span>
 <span id="L54" class="LineNr"> 54 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L55" class="LineNr"> 55 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L56" class="LineNr"> 56 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L57" class="LineNr"> 57 </span>    out &lt;&lt; inspect<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> out &lt;&lt; inspect<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L58" class="LineNr"> 58 </span>  <span class="Delimiter">}</span>
 <span id="L59" class="LineNr"> 59 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">,</span> <span class="Constant">&quot;app&quot;</span><span class="Delimiter">)</span> &lt;&lt; out<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -145,12 +146,12 @@ if ('onhashchange' in window) {
 <span id="L82" class="LineNr"> 82 </span><span class="Delimiter">:(code)</span>
 <span id="L83" class="LineNr"> 83 </span>string inspect<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; r<span class="Delimiter">,</span> <span class="Normal">const</span> vector&lt;<span class="Normal">double</span>&gt;&amp; data<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L85" class="LineNr"> 85 </span>    <span class="Identifier">return</span> r<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> r<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Comment">// End inspect Special-cases(r, data)</span>
 <span id="L87" class="LineNr"> 87 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L90" class="LineNr"> 90 </span>    out &lt;&lt; no_scientific<span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> out &lt;&lt; no_scientific<span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Delimiter">}</span>
 <span id="L92" class="LineNr"> 92 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L93" class="LineNr"> 93 </span><span class="Delimiter">}</span>
@@ -194,7 +195,7 @@ if ('onhashchange' in window) {
 <span id="L131" class="LineNr">131 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L132" class="LineNr">132 </span><span class="Normal">case</span> TRACE_UNTIL: <span class="Delimiter">{</span>
 <span id="L133" class="LineNr">133 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L134" class="LineNr">134 </span>    Trace_stream<span class="Delimiter">-&gt;</span>collect_depth = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> Trace_stream<span class="Delimiter">-&gt;</span>collect_depth = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Delimiter">}</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L137" class="LineNr">137 </span><span class="Delimiter">}</span>
@@ -210,10 +211,10 @@ if ('onhashchange' in window) {
 <span id="L147" class="LineNr">147 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L148" class="LineNr">148 </span><span class="Normal">case</span> _DUMP_TRACE: <span class="Delimiter">{</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L150" class="LineNr">150 </span>    <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L153" class="LineNr">153 </span>    <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
 <span id="L154" class="LineNr">154 </span>  <span class="Delimiter">}</span>
 <span id="L155" class="LineNr">155 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
@@ -243,9 +244,9 @@ if ('onhashchange' in window) {
 <span id="L180" class="LineNr">180 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L181" class="LineNr">181 </span><span class="Normal">case</span> _SAVE_TRACE: <span class="Delimiter">{</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Save_trace<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L183" class="LineNr">183 </span>    ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
-<span id="L184" class="LineNr">184 </span>    fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
-<span id="L185" class="LineNr">185 </span>    fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
 <span id="L186" class="LineNr">186 </span>  <span class="Delimiter">}</span>
 <span id="L187" class="LineNr">187 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L188" class="LineNr">188 </span><span class="Delimiter">}</span>
@@ -263,25 +264,25 @@ if ('onhashchange' in window) {
 <span id="L200" class="LineNr">200 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L201" class="LineNr">201 </span><span class="Normal">case</span> _PRINT: <span class="Delimiter">{</span>
 <span id="L202" class="LineNr">202 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L203" class="LineNr">203 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L204" class="LineNr">204 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;$print: &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L205" class="LineNr">205 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!has_property<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;newline&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>        cout &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
-<span id="L207" class="LineNr">207 </span>      <span class="Delimiter">}</span>
-<span id="L208" class="LineNr">208 </span>      <span class="Comment">// hack: '$print 10' prints '10', but '$print 10/newline' prints '\n'</span>
-<span id="L209" class="LineNr">209 </span>      <span class="Comment">// End $print 10/newline Special-cases</span>
-<span id="L210" class="LineNr">210 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L211" class="LineNr">211 </span>        cout &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L212" class="LineNr">212 </span>      <span class="Delimiter">}</span>
-<span id="L213" class="LineNr">213 </span>    <span class="Delimiter">}</span>
-<span id="L214" class="LineNr">214 </span>    <span class="Comment">// End $print Special-cases</span>
-<span id="L215" class="LineNr">215 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L216" class="LineNr">216 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L217" class="LineNr">217 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;$print: &quot;</span> &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L218" class="LineNr">218 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>j &gt; <span class="Constant">0</span><span class="Delimiter">)</span> cout &lt;&lt; <span class="Constant">&quot; &quot;</span><span class="Delimiter">;</span>
-<span id="L219" class="LineNr">219 </span>        cout &lt;&lt; no_scientific<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
-<span id="L220" class="LineNr">220 </span>      <span class="Delimiter">}</span>
-<span id="L221" class="LineNr">221 </span>    <span class="Delimiter">}</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;$print: &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_property<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;newline&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cout &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// hack: '$print 10' prints '10', but '$print 10/newline' prints '\n'</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End $print 10/newline Special-cases</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cout &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Comment">// End $print Special-cases</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;$print: &quot;</span> &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>j &gt; <span class="Constant">0</span><span class="Delimiter">)</span> cout &lt;&lt; <span class="Constant">&quot; &quot;</span><span class="Delimiter">;</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cout &lt;&lt; no_scientific<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L222" class="LineNr">222 </span>  <span class="Delimiter">}</span>
 <span id="L223" class="LineNr">223 </span>  cout<span class="Delimiter">.</span>flush<span class="Delimiter">();</span>
 <span id="L224" class="LineNr">224 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -308,11 +309,11 @@ if ('onhashchange' in window) {
 <span id="L245" class="LineNr">245 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L246" class="LineNr">246 </span><span class="Normal">case</span> _SYSTEM: <span class="Delimiter">{</span>
 <span id="L247" class="LineNr">247 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L248" class="LineNr">248 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$system' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L249" class="LineNr">249 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$system' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L250" class="LineNr">250 </span>  <span class="Delimiter">}</span>
 <span id="L251" class="LineNr">251 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L252" class="LineNr">252 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient to '$system' must be a literal text, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient to '$system' must be a literal text, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L253" class="LineNr">253 </span>  <span class="Delimiter">}</span>
 <span id="L254" class="LineNr">254 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L255" class="LineNr">255 </span><span class="Delimiter">}</span>
@@ -358,7 +359,7 @@ if ('onhashchange' in window) {
 <span id="L295" class="LineNr">295 </span><span class="Normal">case</span> _LOG: <span class="Delimiter">{</span>
 <span id="L296" class="LineNr">296 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L297" class="LineNr">297 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L298" class="LineNr">298 </span>    out &lt;&lt; inspect<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span> out &lt;&lt; inspect<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L299" class="LineNr">299 </span>  <span class="Delimiter">}</span>
 <span id="L300" class="LineNr">300 </span>  LOG &lt;&lt; out<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L301" class="LineNr">301 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
diff --git a/html/030container.cc.html b/html/030container.cc.html
index d3196b37..3c01da4b 100644
--- a/html/030container.cc.html
+++ b/html/030container.cc.html
@@ -18,13 +18,14 @@ a:hover { text-decoration: underline; }
 .SalientComment { color: #00ffff; }
 .CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.LineNr { color: #444444; }
 .muData { color: #ffff00; }
+.LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.traceAbsent { color: #c00000; }
 .Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
-.traceAbsent { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .Special { color: #c00000; }
@@ -165,7 +166,7 @@ if ('onhashchange' in window) {
 <span id="L100" class="LineNr">100 </span>  vector&lt;<span class="Normal">int</span>&gt; offset<span class="Delimiter">;</span>  <span class="Comment">// not used by exclusive containers</span>
 <span id="L101" class="LineNr">101 </span>  <span class="Comment">// End container_metadata Fields</span>
 <span id="L102" class="LineNr">102 </span>  container_metadata<span class="Delimiter">()</span> :size<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Comment">// End container_metadata Constructor</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Comment">// End container_metadata Constructor</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Delimiter">}</span>
 <span id="L105" class="LineNr">105 </span><span class="Delimiter">};</span>
 <span id="L106" class="LineNr">106 </span><span class="Delimiter">:(before &quot;End reagent Fields&quot;)</span>
@@ -188,21 +189,21 @@ if ('onhashchange' in window) {
 <span id="L123" class="LineNr">123 </span><span class="Comment">// invariant: Container_metadata always contains a superset of Container_metadata_snapshot</span>
 <span id="L124" class="LineNr">124 </span><span class="Normal">void</span> <a href='030container.cc.html#L124'>restore_container_metadata</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L125" class="LineNr">125 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L126" class="LineNr">126 </span>    assert<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">);</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata_snapshot<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L128" class="LineNr">128 </span>      assert<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == Container_metadata_snapshot<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">);</span>
-<span id="L129" class="LineNr">129 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L130" class="LineNr">130 </span>    <span class="Delimiter">}</span>
-<span id="L131" class="LineNr">131 </span>    <span class="Normal">delete</span> Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">;</span>
-<span id="L132" class="LineNr">132 </span>    Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">);</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata_snapshot<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == Container_metadata_snapshot<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">);</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">;</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L133" class="LineNr">133 </span>  <span class="Delimiter">}</span>
 <span id="L134" class="LineNr">134 </span>  Container_metadata<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata_snapshot<span class="Delimiter">));</span>
 <span id="L135" class="LineNr">135 </span><span class="Delimiter">}</span>
 <span id="L136" class="LineNr">136 </span><span class="Normal">void</span> <a href='030container.cc.html#L136'>clear_container_metadata</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L137" class="LineNr">137 </span>  Container_metadata_snapshot<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L139" class="LineNr">139 </span>    <span class="Normal">delete</span> Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">;</span>
-<span id="L140" class="LineNr">140 </span>    Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">;</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> Container_metadata<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Delimiter">}</span>
 <span id="L142" class="LineNr">142 </span>  Container_metadata<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L143" class="LineNr">143 </span><span class="Delimiter">}</span>
@@ -223,9 +224,9 @@ if ('onhashchange' in window) {
 <span id="L158" class="LineNr">158 </span><span class="Normal">if</span> <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Comment">// Compute size_of Container</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L161" class="LineNr">161 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unknown size for container type '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unknown size for container type '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L162" class="LineNr">162 </span><span class="CommentedCode">//?     DUMP(&quot;&quot;);</span>
-<span id="L163" class="LineNr">163 </span>    <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Delimiter">}</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Identifier">return</span> get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> type<span class="Delimiter">).</span>size<span class="Delimiter">;</span>
 <span id="L166" class="LineNr">166 </span><span class="Delimiter">}</span>
@@ -240,12 +241,12 @@ if ('onhashchange' in window) {
 <span id="L175" class="LineNr">175 </span>  recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L176" class="LineNr">176 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- compute container sizes for &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L178" class="LineNr">178 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L179" class="LineNr">179 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;- compute container sizes for &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L180" class="LineNr">180 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L181" class="LineNr">181 </span>      compute_container_sizes<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
-<span id="L182" class="LineNr">182 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L183" class="LineNr">183 </span>      compute_container_sizes<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;- compute container sizes for &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_sizes<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_sizes<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
 <span id="L184" class="LineNr">184 </span>  <span class="Delimiter">}</span>
 <span id="L185" class="LineNr">185 </span><span class="Delimiter">}</span>
 <span id="L186" class="LineNr">186 </span>
@@ -257,7 +258,7 @@ if ('onhashchange' in window) {
 <span id="L192" class="LineNr">192 </span>  set&lt;type_tree&gt; pending_metadata<span class="Delimiter">;</span>  <span class="Comment">// might actually be faster to just convert to string rather than compare type_tree directly; so far the difference is negligible</span>
 <span id="L193" class="LineNr">193 </span>  compute_container_sizes<span class="Delimiter">(</span>rcopy<span class="Delimiter">.</span>type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> rcopy<span class="Delimiter">.</span>type<span class="Delimiter">))</span>
-<span id="L195" class="LineNr">195 </span>    r<span class="Delimiter">.</span>metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> rcopy<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> r<span class="Delimiter">.</span>metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> rcopy<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L196" class="LineNr">196 </span><span class="Delimiter">}</span>
 <span id="L197" class="LineNr">197 </span>
 <span id="L198" class="LineNr">198 </span><span class="Normal">void</span> compute_container_sizes<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> set&lt;type_tree&gt;&amp; pending_metadata<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; location_for_error_messages<span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -267,20 +268,20 @@ if ('onhashchange' in window) {
 <span id="L202" class="LineNr">202 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>pending_metadata<span class="Delimiter">,</span> *type<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L203" class="LineNr">203 </span>  pending_metadata<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>*type<span class="Delimiter">);</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L205" class="LineNr">205 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L207" class="LineNr">207 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L208" class="LineNr">208 </span>    <span class="Delimiter">}</span>
-<span id="L209" class="LineNr">209 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;address&quot;</span><span class="Delimiter">)</span>
-<span id="L210" class="LineNr">210 </span>      compute_container_sizes<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">(</span>type<span class="Delimiter">),</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L211" class="LineNr">211 </span>    <span class="Comment">// End compute_container_sizes Non-atom Special-cases</span>
-<span id="L212" class="LineNr">212 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;address&quot;</span><span class="Delimiter">)</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_sizes<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">(</span>type<span class="Delimiter">),</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Comment">// End compute_container_sizes Non-atom Special-cases</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Delimiter">}</span>
 <span id="L214" class="LineNr">214 </span>  assert<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L215" class="LineNr">215 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// error raised elsewhere</span>
 <span id="L216" class="LineNr">216 </span>  type_info&amp; info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span>
-<span id="L218" class="LineNr">218 </span>    compute_container_sizes<span class="Delimiter">(</span>info<span class="Delimiter">,</span> type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> compute_container_sizes<span class="Delimiter">(</span>info<span class="Delimiter">,</span> type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L219" class="LineNr">219 </span>  <span class="Comment">// End compute_container_sizes Atom Special-cases</span>
 <span id="L220" class="LineNr">220 </span><span class="Delimiter">}</span>
 <span id="L221" class="LineNr">221 </span>
@@ -291,11 +292,11 @@ if ('onhashchange' in window) {
 <span id="L226" class="LineNr">226 </span>  <span class="Comment">// length in the type.)</span>
 <span id="L227" class="LineNr">227 </span>  container_metadata metadata<span class="Delimiter">;</span>
 <span id="L228" class="LineNr">228 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L229" class="LineNr">229 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = container_info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L230" class="LineNr">230 </span>    <span class="Comment">// Compute Container Size(element, full_type)</span>
-<span id="L231" class="LineNr">231 </span>    compute_container_sizes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L232" class="LineNr">232 </span>    metadata<span class="Delimiter">.</span>offset<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">);</span>  <span class="Comment">// save previous size as offset</span>
-<span id="L233" class="LineNr">233 </span>    metadata<span class="Delimiter">.</span>size += size_of<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = container_info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Comment">// Compute Container Size(element, full_type)</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> compute_container_sizes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> metadata<span class="Delimiter">.</span>offset<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">);</span>  <span class="Comment">// save previous size as offset</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> metadata<span class="Delimiter">.</span>size += size_of<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L234" class="LineNr">234 </span>  <span class="Delimiter">}</span>
 <span id="L235" class="LineNr">235 </span>  Container_metadata<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;type_tree*<span class="Delimiter">,</span> container_metadata&gt;<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*full_type<span class="Delimiter">),</span> metadata<span class="Delimiter">));</span>
 <span id="L236" class="LineNr">236 </span><span class="Delimiter">}</span>
@@ -310,8 +311,8 @@ if ('onhashchange' in window) {
 <span id="L245" class="LineNr">245 </span>
 <span id="L246" class="LineNr">246 </span>container_metadata&amp; get<span class="Delimiter">(</span>vector&lt;pair&lt;type_tree*<span class="Delimiter">,</span> container_metadata&gt; &gt;&amp; all<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* key<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L247" class="LineNr">247 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>all<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L248" class="LineNr">248 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L264'>matches</a><span class="Delimiter">(</span>all<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> key<span class="Delimiter">))</span>
-<span id="L249" class="LineNr">249 </span>      <span class="Identifier">return</span> all<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L264'>matches</a><span class="Delimiter">(</span>all<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> key<span class="Delimiter">))</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> all<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">;</span>
 <span id="L250" class="LineNr">250 </span>  <span class="Delimiter">}</span>
 <span id="L251" class="LineNr">251 </span>  tb_shutdown<span class="Delimiter">();</span>
 <span id="L252" class="LineNr">252 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unknown size for type '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>key<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -320,8 +321,8 @@ if ('onhashchange' in window) {
 <span id="L255" class="LineNr">255 </span>
 <span id="L256" class="LineNr">256 </span><span class="Normal">bool</span> contains_key<span class="Delimiter">(</span><span class="Normal">const</span> vector&lt;pair&lt;type_tree*<span class="Delimiter">,</span> container_metadata&gt; &gt;&amp; all<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* key<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L257" class="LineNr">257 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>all<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L258" class="LineNr">258 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L264'>matches</a><span class="Delimiter">(</span>all<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> key<span class="Delimiter">))</span>
-<span id="L259" class="LineNr">259 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L264'>matches</a><span class="Delimiter">(</span>all<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first<span class="Delimiter">,</span> key<span class="Delimiter">))</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L260" class="LineNr">260 </span>  <span class="Delimiter">}</span>
 <span id="L261" class="LineNr">261 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L262" class="LineNr">262 </span><span class="Delimiter">}</span>
@@ -388,9 +389,9 @@ if ('onhashchange' in window) {
 <span id="L323" class="LineNr">323 </span><span class="Normal">void</span> <a href='030container.cc.html#L323'>test_container_sizes_recursive</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L324" class="LineNr">324 </span>  <span class="Comment">// define a container containing an address to itself</span>
 <span id="L325" class="LineNr">325 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L326" class="LineNr">326 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L327" class="LineNr">327 </span>      <span class="Constant">&quot;  y:<a href='043space.cc.html#L76'>address</a>:foo</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L328" class="LineNr">328 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L326" class="LineNr">326 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:<a href='043space.cc.html#L76'>address</a>:foo</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L329" class="LineNr">329 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo&quot;</span><span class="Delimiter">);</span>
 <span id="L330" class="LineNr">330 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L331" class="LineNr">331 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">);</span>
@@ -426,34 +427,34 @@ if ('onhashchange' in window) {
 <span id="L361" class="LineNr">361 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L362" class="LineNr">362 </span><span class="Normal">case</span> GET: <span class="Delimiter">{</span>
 <span id="L363" class="LineNr">363 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L364" class="LineNr">364 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L365" class="LineNr">365 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L366" class="LineNr">366 </span>  <span class="Delimiter">}</span>
 <span id="L367" class="LineNr">367 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// new copy for every invocation</span>
 <span id="L368" class="LineNr">368 </span>  <span class="Comment">// Update GET base in Check</span>
 <span id="L369" class="LineNr">369 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L370" class="LineNr">370 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L371" class="LineNr">371 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L372" class="LineNr">372 </span>  <span class="Delimiter">}</span>
 <span id="L373" class="LineNr">373 </span>  <span class="Normal">const</span> type_tree* base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
 <span id="L374" class="LineNr">374 </span>  <span class="Comment">// Update GET base_type in Check</span>
 <span id="L375" class="LineNr">375 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base_type<span class="Delimiter">-&gt;</span>atom || base_type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind != <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L376" class="LineNr">376 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L377" class="LineNr">377 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L378" class="LineNr">378 </span>  <span class="Delimiter">}</span>
 <span id="L379" class="LineNr">379 </span>  <span class="Normal">const</span> reagent&amp; offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L380" class="LineNr">380 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L381" class="LineNr">381 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'get' should have type 'offset', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L382" class="LineNr">382 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'get' should have type 'offset', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L383" class="LineNr">383 </span>  <span class="Delimiter">}</span>
 <span id="L384" class="LineNr">384 </span>  <span class="Normal">int</span> offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L385" class="LineNr">385 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L386" class="LineNr">386 </span>    offset_value = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> offset_value = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
 <span id="L387" class="LineNr">387 </span>  <span class="Delimiter">}</span>
 <span id="L388" class="LineNr">388 </span>  <span class="Comment">// End update GET offset_value in Check</span>
 <span id="L389" class="LineNr">389 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L390" class="LineNr">390 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset '&quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot;' for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L391" class="LineNr">391 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset '&quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot;' for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L392" class="LineNr">392 </span>  <span class="Delimiter">}</span>
 <span id="L393" class="LineNr">393 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L394" class="LineNr">394 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -461,8 +462,8 @@ if ('onhashchange' in window) {
 <span id="L396" class="LineNr">396 </span>  <span class="Comment">//: use base.type rather than base_type because later layers will introduce compound types</span>
 <span id="L397" class="LineNr">397 </span>  <span class="Normal">const</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">,</span> offset_value<span class="Delimiter">);</span>
 <span id="L398" class="LineNr">398 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span> element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L399" class="LineNr">399 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L400" class="LineNr">400 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L401" class="LineNr">401 </span>  <span class="Delimiter">}</span>
 <span id="L402" class="LineNr">402 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L403" class="LineNr">403 </span><span class="Delimiter">}</span>
@@ -472,8 +473,8 @@ if ('onhashchange' in window) {
 <span id="L407" class="LineNr">407 </span>  <span class="Comment">// Update GET base in Run</span>
 <span id="L408" class="LineNr">408 </span>  <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L409" class="LineNr">409 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L410" class="LineNr">410 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L411" class="LineNr">411 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L412" class="LineNr">412 </span>  <span class="Delimiter">}</span>
 <span id="L413" class="LineNr">413 </span>  <span class="Normal">const</span> type_tree* base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
 <span id="L414" class="LineNr">414 </span>  <span class="Comment">// Update GET base_type in Run</span>
@@ -574,50 +575,50 @@ if ('onhashchange' in window) {
 <span id="L509" class="LineNr">509 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L510" class="LineNr">510 </span><span class="Normal">case</span> PUT: <span class="Delimiter">{</span>
 <span id="L511" class="LineNr">511 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">3</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L512" class="LineNr">512 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put' expects exactly 3 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L513" class="LineNr">513 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L512" class="LineNr">512 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put' expects exactly 3 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L513" class="LineNr">513 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L514" class="LineNr">514 </span>  <span class="Delimiter">}</span>
 <span id="L515" class="LineNr">515 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L516" class="LineNr">516 </span>  <span class="Comment">// Update PUT base in Check</span>
 <span id="L517" class="LineNr">517 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L518" class="LineNr">518 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'put' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L519" class="LineNr">519 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'put' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L519" class="LineNr">519 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L520" class="LineNr">520 </span>  <span class="Delimiter">}</span>
 <span id="L521" class="LineNr">521 </span>  <span class="Normal">const</span> type_tree* base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
 <span id="L522" class="LineNr">522 </span>  <span class="Comment">// Update PUT base_type in Check</span>
 <span id="L523" class="LineNr">523 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base_type<span class="Delimiter">-&gt;</span>atom || base_type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind != <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L524" class="LineNr">524 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'put' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L525" class="LineNr">525 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L524" class="LineNr">524 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'put' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L525" class="LineNr">525 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L526" class="LineNr">526 </span>  <span class="Delimiter">}</span>
 <span id="L527" class="LineNr">527 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L528" class="LineNr">528 </span>  <span class="Comment">// Update PUT offset in Check</span>
 <span id="L529" class="LineNr">529 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L530" class="LineNr">530 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'put' should have type 'offset', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L531" class="LineNr">531 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L530" class="LineNr">530 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'put' should have type 'offset', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L531" class="LineNr">531 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L532" class="LineNr">532 </span>  <span class="Delimiter">}</span>
 <span id="L533" class="LineNr">533 </span>  <span class="Normal">int</span> offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L534" class="LineNr">534 </span>  <span class="Comment">//: later layers will permit non-integer offsets</span>
 <span id="L535" class="LineNr">535 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L536" class="LineNr">536 </span>    offset_value = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
-<span id="L537" class="LineNr">537 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L538" class="LineNr">538 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset '&quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot;' for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L539" class="LineNr">539 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L540" class="LineNr">540 </span>    <span class="Delimiter">}</span>
+<span id="L536" class="LineNr">536 </span>  <span class="Conceal">¦</span> offset_value = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+<span id="L537" class="LineNr">537 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L538" class="LineNr">538 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset '&quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot;' for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L540" class="LineNr">540 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L541" class="LineNr">541 </span>  <span class="Delimiter">}</span>
 <span id="L542" class="LineNr">542 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L543" class="LineNr">543 </span>    offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L544" class="LineNr">544 </span>  <span class="Delimiter">}</span>
 <span id="L545" class="LineNr">545 </span>  <span class="Normal">const</span> reagent&amp; value = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
 <span id="L546" class="LineNr">546 </span>  <span class="Comment">//: use base.type rather than base_type because later layers will introduce compound types</span>
 <span id="L547" class="LineNr">547 </span>  <span class="Normal">const</span> reagent&amp; element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">,</span> offset_value<span class="Delimiter">);</span>
 <span id="L548" class="LineNr">548 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>element<span class="Delimiter">,</span> value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L549" class="LineNr">549 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; value<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>value<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L550" class="LineNr">550 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; value<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>value<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L550" class="LineNr">550 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L551" class="LineNr">551 </span>  <span class="Delimiter">}</span>
 <span id="L552" class="LineNr">552 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// no more checks necessary</span>
 <span id="L553" class="LineNr">553 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name != inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L554" class="LineNr">554 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'put' must be first ingredient '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L555" class="LineNr">555 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L554" class="LineNr">554 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'put' must be first ingredient '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L555" class="LineNr">555 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L556" class="LineNr">556 </span>  <span class="Delimiter">}</span>
 <span id="L557" class="LineNr">557 </span>  <span class="Comment">// End PUT Product Checks</span>
 <span id="L558" class="LineNr">558 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -628,8 +629,8 @@ if ('onhashchange' in window) {
 <span id="L563" class="LineNr">563 </span>  <span class="Comment">// Update PUT base in Run</span>
 <span id="L564" class="LineNr">564 </span>  <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L565" class="LineNr">565 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L566" class="LineNr">566 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L567" class="LineNr">567 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L566" class="LineNr">566 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L567" class="LineNr">567 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L568" class="LineNr">568 </span>  <span class="Delimiter">}</span>
 <span id="L569" class="LineNr">569 </span>  <span class="Normal">const</span> type_tree* base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
 <span id="L570" class="LineNr">570 </span>  <span class="Comment">// Update PUT base_type in Run</span>
@@ -641,8 +642,8 @@ if ('onhashchange' in window) {
 <span id="L576" class="LineNr">576 </span>  <span class="Comment">// and writing the entire container</span>
 <span id="L577" class="LineNr">577 </span>  <span class="Comment">// Write Memory in PUT in Run</span>
 <span id="L578" class="LineNr">578 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L579" class="LineNr">579 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; address+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L580" class="LineNr">580 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L579" class="LineNr">579 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; address+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L580" class="LineNr">580 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L581" class="LineNr">581 </span>  <span class="Delimiter">}</span>
 <span id="L582" class="LineNr">582 </span>  <span class="Identifier">goto</span> finish_instruction<span class="Delimiter">;</span>
 <span id="L583" class="LineNr">583 </span><span class="Delimiter">}</span>
@@ -727,78 +728,78 @@ if ('onhashchange' in window) {
 <span id="L662" class="LineNr">662 </span>  skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L663" class="LineNr">663 </span>  string name = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L664" class="LineNr">664 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L665" class="LineNr">665 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L666" class="LineNr">666 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete container definition at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L667" class="LineNr">667 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L665" class="LineNr">665 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L666" class="LineNr">666 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete container definition at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L667" class="LineNr">667 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L668" class="LineNr">668 </span>  <span class="Delimiter">}</span>
 <span id="L669" class="LineNr">669 </span>  <span class="Comment">// End container Name Refinements</span>
 <span id="L670" class="LineNr">670 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- defining &quot;</span> &lt;&lt; command &lt;&lt; <span class="Constant">' '</span> &lt;&lt; name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L671" class="LineNr">671 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span>
-<span id="L672" class="LineNr">672 </span>      || get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L673" class="LineNr">673 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
+<span id="L672" class="LineNr">672 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> || get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L673" class="LineNr">673 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
 <span id="L674" class="LineNr">674 </span>  <span class="Delimiter">}</span>
 <span id="L675" class="LineNr">675 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type number: &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L676" class="LineNr">676 </span>  <a href='030container.cc.html#L733'>skip_bracket</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">&quot;'&quot;</span>+command+<span class="Constant">&quot;' must begin with '['&quot;</span><span class="Delimiter">);</span>
 <span id="L677" class="LineNr">677 </span>  type_info&amp; info = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
 <span id="L678" class="LineNr">678 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>Num_calls_to_transform_all_at_first_definition == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L679" class="LineNr">679 </span>    <span class="Comment">// initial definition of this container</span>
-<span id="L680" class="LineNr">680 </span>    info<span class="Delimiter">.</span>Num_calls_to_transform_all_at_first_definition = Num_calls_to_transform_all<span class="Delimiter">;</span>
+<span id="L679" class="LineNr">679 </span>  <span class="Conceal">¦</span> <span class="Comment">// initial definition of this container</span>
+<span id="L680" class="LineNr">680 </span>  <span class="Conceal">¦</span> info<span class="Delimiter">.</span>Num_calls_to_transform_all_at_first_definition = Num_calls_to_transform_all<span class="Delimiter">;</span>
 <span id="L681" class="LineNr">681 </span>  <span class="Delimiter">}</span>
 <span id="L682" class="LineNr">682 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>Num_calls_to_transform_all_at_first_definition != Num_calls_to_transform_all<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L683" class="LineNr">683 </span>    <span class="Comment">// extension after transform_all</span>
-<span id="L684" class="LineNr">684 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;there was a call to transform_all() between the definition of container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' and a subsequent extension. This is not supported, since any recipes that used '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' values have already been transformed and </span><span class="cSpecial">\&quot;</span><span class="Constant">frozen</span><span class="cSpecial">\&quot;</span><span class="Constant">.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L685" class="LineNr">685 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L683" class="LineNr">683 </span>  <span class="Conceal">¦</span> <span class="Comment">// extension after transform_all</span>
+<span id="L684" class="LineNr">684 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;there was a call to transform_all() between the definition of container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' and a subsequent extension. This is not supported, since any recipes that used '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' values have already been transformed and </span><span class="cSpecial">\&quot;</span><span class="Constant">frozen</span><span class="cSpecial">\&quot;</span><span class="Constant">.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L685" class="LineNr">685 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L686" class="LineNr">686 </span>  <span class="Delimiter">}</span>
 <span id="L687" class="LineNr">687 </span>  info<span class="Delimiter">.</span>name = name<span class="Delimiter">;</span>
 <span id="L688" class="LineNr">688 </span>  info<span class="Delimiter">.</span>kind = kind<span class="Delimiter">;</span>
 <span id="L689" class="LineNr">689 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L690" class="LineNr">690 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L691" class="LineNr">691 </span>    string element = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L692" class="LineNr">692 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>element<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L693" class="LineNr">693 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L694" class="LineNr">694 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete container definition at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L695" class="LineNr">695 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L696" class="LineNr">696 </span>    <span class="Delimiter">}</span>
-<span id="L697" class="LineNr">697 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>element == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L698" class="LineNr">698 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L699" class="LineNr">699 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; command &lt;&lt; <span class="Constant">&quot; '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' contains multiple elements on a single line. Containers and exclusive containers must only contain elements, one to a line, no code.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L700" class="LineNr">700 </span>      <span class="Comment">// skip rest of container declaration</span>
-<span id="L701" class="LineNr">701 </span>      <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L702" class="LineNr">702 </span>        <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L703" class="LineNr">703 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L704" class="LineNr">704 </span>      <span class="Delimiter">}</span>
-<span id="L705" class="LineNr">705 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L706" class="LineNr">706 </span>    <span class="Delimiter">}</span>
-<span id="L707" class="LineNr">707 </span>    info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>element<span class="Delimiter">));</span>
-<span id="L708" class="LineNr">708 </span>    expand_type_abbreviations<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>type<span class="Delimiter">);</span>  <span class="Comment">// todo: use abbreviation before declaration</span>
-<span id="L709" class="LineNr">709 </span>    <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>type<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
-<span id="L710" class="LineNr">710 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  element: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">())</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L711" class="LineNr">711 </span>    <span class="Comment">// End Load Container Element Definition</span>
+<span id="L690" class="LineNr">690 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L691" class="LineNr">691 </span>  <span class="Conceal">¦</span> string element = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L692" class="LineNr">692 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>element<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L693" class="LineNr">693 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L694" class="LineNr">694 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete container definition at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L695" class="LineNr">695 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L696" class="LineNr">696 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L697" class="LineNr">697 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>element == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L698" class="LineNr">698 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L699" class="LineNr">699 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; command &lt;&lt; <span class="Constant">&quot; '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' contains multiple elements on a single line. Containers and exclusive containers must only contain elements, one to a line, no code.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L700" class="LineNr">700 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// skip rest of container declaration</span>
+<span id="L701" class="LineNr">701 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L702" class="LineNr">702 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L703" class="LineNr">703 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L704" class="LineNr">704 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L705" class="LineNr">705 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L706" class="LineNr">706 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L707" class="LineNr">707 </span>  <span class="Conceal">¦</span> info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>element<span class="Delimiter">));</span>
+<span id="L708" class="LineNr">708 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>type<span class="Delimiter">);</span>  <span class="Comment">// todo: use abbreviation before declaration</span>
+<span id="L709" class="LineNr">709 </span>  <span class="Conceal">¦</span> <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>type<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
+<span id="L710" class="LineNr">710 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  element: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">())</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L711" class="LineNr">711 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Load Container Element Definition</span>
 <span id="L712" class="LineNr">712 </span>  <span class="Delimiter">}</span>
 <span id="L713" class="LineNr">713 </span><span class="Delimiter">}</span>
 <span id="L714" class="LineNr">714 </span>
 <span id="L715" class="LineNr">715 </span><span class="Normal">void</span> <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> type_info&amp; info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L716" class="LineNr">716 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L717" class="LineNr">717 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L718" class="LineNr">718 </span>    <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
-<span id="L719" class="LineNr">719 </span>    <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
-<span id="L720" class="LineNr">720 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L718" class="LineNr">718 </span>  <span class="Conceal">¦</span> <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
+<span id="L719" class="LineNr">719 </span>  <span class="Conceal">¦</span> <a href='030container.cc.html#L715'>replace_unknown_types_with_unique_ordinals</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> info<span class="Delimiter">);</span>
+<span id="L720" class="LineNr">720 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L721" class="LineNr">721 </span>  <span class="Delimiter">}</span>
 <span id="L722" class="LineNr">722 </span>  assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
 <span id="L723" class="LineNr">723 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L724" class="LineNr">724 </span>    type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L724" class="LineNr">724 </span>  <span class="Conceal">¦</span> type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L725" class="LineNr">725 </span>  <span class="Delimiter">}</span>
 <span id="L726" class="LineNr">726 </span>  <span class="Comment">// End insert_container Special-cases</span>
 <span id="L727" class="LineNr">727 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// used in recipe types</span>
-<span id="L728" class="LineNr">728 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
-<span id="L729" class="LineNr">729 </span>    type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L728" class="LineNr">728 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
+<span id="L729" class="LineNr">729 </span>  <span class="Conceal">¦</span> type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L730" class="LineNr">730 </span>  <span class="Delimiter">}</span>
 <span id="L731" class="LineNr">731 </span><span class="Delimiter">}</span>
 <span id="L732" class="LineNr">732 </span>
 <span id="L733" class="LineNr">733 </span><span class="Normal">void</span> <a href='030container.cc.html#L733'>skip_bracket</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> string message<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L734" class="LineNr">734 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L735" class="LineNr">735 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
-<span id="L736" class="LineNr">736 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; message &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L736" class="LineNr">736 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; message &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L737" class="LineNr">737 </span><span class="Delimiter">}</span>
 <span id="L738" class="LineNr">738 </span>
 <span id="L739" class="LineNr">739 </span><span class="Delimiter">:(scenario multi_word_line_in_container_declaration)</span>
@@ -828,8 +829,8 @@ if ('onhashchange' in window) {
 <span id="L763" class="LineNr">763 </span><span class="Comment">// but it doesn't seem to cause any noticeable slowdown</span>
 <span id="L764" class="LineNr">764 </span><span class="Normal">void</span> <a href='030container.cc.html#L764'>expand_type_abbreviations_in_containers</a><span class="Delimiter">(</span><a href='001help.cc.html#L255'>unused</a> <span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L765" class="LineNr">765 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;type_ordinal<span class="Delimiter">,</span> type_info&gt;::iterator p = Type<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L766" class="LineNr">766 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L767" class="LineNr">767 </span>      expand_type_abbreviations<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L766" class="LineNr">766 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L767" class="LineNr">767 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
 <span id="L768" class="LineNr">768 </span>  <span class="Delimiter">}</span>
 <span id="L769" class="LineNr">769 </span><span class="Delimiter">}</span>
 <span id="L770" class="LineNr">770 </span>
@@ -844,15 +845,15 @@ if ('onhashchange' in window) {
 <span id="L779" class="LineNr">779 </span><span class="Normal">void</span> test_error_on_transform_all_between_container_definition_and_extension<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L780" class="LineNr">780 </span>  <span class="Comment">// define a container</span>
 <span id="L781" class="LineNr">781 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L782" class="LineNr">782 </span>      <span class="Constant">&quot;  a:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L783" class="LineNr">783 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L782" class="LineNr">782 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  a:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L783" class="LineNr">783 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L784" class="LineNr">784 </span>  <span class="Comment">// try to extend the container after transform</span>
 <span id="L785" class="LineNr">785 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
 <span id="L786" class="LineNr">786 </span>  <a href='003trace.cc.html#L221'>CHECK_TRACE_DOESNT_CONTAIN_ERRORS</a><span class="Delimiter">();</span>
 <span id="L787" class="LineNr">787 </span>  Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L788" class="LineNr">788 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L789" class="LineNr">789 </span>      <span class="Constant">&quot;  b:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L790" class="LineNr">790 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L789" class="LineNr">789 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  b:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L790" class="LineNr">790 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L791" class="LineNr">791 </span>  <a href='003trace.cc.html#L220'>CHECK_TRACE_CONTAINS_ERRORS</a><span class="Delimiter">();</span>
 <span id="L792" class="LineNr">792 </span><span class="Delimiter">}</span>
 <span id="L793" class="LineNr">793 </span>
@@ -884,11 +885,11 @@ if ('onhashchange' in window) {
 <span id="L819" class="LineNr">819 </span>  recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L820" class="LineNr">820 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- check for invalid types in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L821" class="LineNr">821 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L822" class="LineNr">822 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L823" class="LineNr">823 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L824" class="LineNr">824 </span>      check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
-<span id="L825" class="LineNr">825 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L826" class="LineNr">826 </span>      check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
+<span id="L822" class="LineNr">822 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L823" class="LineNr">823 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L824" class="LineNr">824 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
+<span id="L825" class="LineNr">825 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L826" class="LineNr">826 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
 <span id="L827" class="LineNr">827 </span>  <span class="Delimiter">}</span>
 <span id="L828" class="LineNr">828 </span>  <span class="Comment">// End check_or_set_invalid_types</span>
 <span id="L829" class="LineNr">829 </span><span class="Delimiter">}</span>
@@ -902,17 +903,17 @@ if ('onhashchange' in window) {
 <span id="L837" class="LineNr">837 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L838" class="LineNr">838 </span>  <span class="Comment">// End Container Type Checks</span>
 <span id="L839" class="LineNr">839 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L840" class="LineNr">840 </span>    check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
-<span id="L841" class="LineNr">841 </span>    check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
-<span id="L842" class="LineNr">842 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L840" class="LineNr">840 </span>  <span class="Conceal">¦</span> check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
+<span id="L841" class="LineNr">841 </span>  <span class="Conceal">¦</span> check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
+<span id="L842" class="LineNr">842 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L843" class="LineNr">843 </span>  <span class="Delimiter">}</span>
 <span id="L844" class="LineNr">844 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L845" class="LineNr">845 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L846" class="LineNr">846 </span>    assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
-<span id="L847" class="LineNr">847 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span>
-<span id="L848" class="LineNr">848 </span>      type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
-<span id="L849" class="LineNr">849 </span>    <span class="Normal">else</span>
-<span id="L850" class="LineNr">850 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; location_for_error_messages &lt;&lt; <span class="Constant">&quot;unknown type &quot;</span> &lt;&lt; type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot; in &quot;</span> &lt;&lt; name_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L846" class="LineNr">846 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+<span id="L847" class="LineNr">847 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span>
+<span id="L848" class="LineNr">848 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L849" class="LineNr">849 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L850" class="LineNr">850 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; location_for_error_messages &lt;&lt; <span class="Constant">&quot;unknown type &quot;</span> &lt;&lt; type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot; in &quot;</span> &lt;&lt; name_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L851" class="LineNr">851 </span>  <span class="Delimiter">}</span>
 <span id="L852" class="LineNr">852 </span><span class="Delimiter">}</span>
 <span id="L853" class="LineNr">853 </span>
@@ -946,23 +947,23 @@ if ('onhashchange' in window) {
 <span id="L881" class="LineNr">881 </span><span class="Delimiter">:(code)</span>
 <span id="L882" class="LineNr">882 </span><span class="Normal">void</span> check_container_field_types<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L883" class="LineNr">883 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;type_ordinal<span class="Delimiter">,</span> type_info&gt;::iterator p = Type<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L884" class="LineNr">884 </span>    <span class="Normal">const</span> type_info&amp; info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
-<span id="L885" class="LineNr">885 </span>    <span class="Comment">// Check Container Field Types(info)</span>
-<span id="L886" class="LineNr">886 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L887" class="LineNr">887 </span>      check_invalid_types<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>name<span class="Delimiter">),</span> info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L884" class="LineNr">884 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> type_info&amp; info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L885" class="LineNr">885 </span>  <span class="Conceal">¦</span> <span class="Comment">// Check Container Field Types(info)</span>
+<span id="L886" class="LineNr">886 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L887" class="LineNr">887 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> check_invalid_types<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>name<span class="Delimiter">),</span> info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
 <span id="L888" class="LineNr">888 </span>  <span class="Delimiter">}</span>
 <span id="L889" class="LineNr">889 </span><span class="Delimiter">}</span>
 <span id="L890" class="LineNr">890 </span>
 <span id="L891" class="LineNr">891 </span><span class="Normal">void</span> check_invalid_types<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; location_for_error_messages<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; name_for_error_messages<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L892" class="LineNr">892 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// will throw a more precise error elsewhere</span>
 <span id="L893" class="LineNr">893 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L894" class="LineNr">894 </span>    check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
-<span id="L895" class="LineNr">895 </span>    check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
-<span id="L896" class="LineNr">896 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L894" class="LineNr">894 </span>  <span class="Conceal">¦</span> check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
+<span id="L895" class="LineNr">895 </span>  <span class="Conceal">¦</span> check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">,</span> name_for_error_messages<span class="Delimiter">);</span>
+<span id="L896" class="LineNr">896 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L897" class="LineNr">897 </span>  <span class="Delimiter">}</span>
 <span id="L898" class="LineNr">898 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// value 0 = compound types (layer parse_tree) or type ingredients (layer shape_shifting_container)</span>
-<span id="L899" class="LineNr">899 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span>
-<span id="L900" class="LineNr">900 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; location_for_error_messages &lt;&lt; <span class="Constant">&quot;unknown type in &quot;</span> &lt;&lt; name_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L899" class="LineNr">899 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span>
+<span id="L900" class="LineNr">900 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; location_for_error_messages &lt;&lt; <span class="Constant">&quot;unknown type in &quot;</span> &lt;&lt; name_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L901" class="LineNr">901 </span>  <span class="Delimiter">}</span>
 <span id="L902" class="LineNr">902 </span><span class="Delimiter">}</span>
 </pre>
diff --git a/html/031merge.cc.html b/html/031merge.cc.html
index 9fe3e71b..dba2759f 100644
--- a/html/031merge.cc.html
+++ b/html/031merge.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .muData { color: #ffff00; }
 .Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
 .cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
-.LineNr { color: #444444; }
-.traceContains { color: #008000; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.PreProc { color: #800080; }
+.traceContains { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
+.LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
+.PreProc { color: #800080; }
 -->
 </style>
 
@@ -87,8 +88,8 @@ if ('onhashchange' in window) {
 <span id="L24" class="LineNr"> 24 </span><span class="Normal">case</span> MERGE: <span class="Delimiter">{</span>
 <span id="L25" class="LineNr"> 25 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L26" class="LineNr"> 26 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>  ++j<span class="Delimiter">)</span>
-<span id="L28" class="LineNr"> 28 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>  ++j<span class="Delimiter">)</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
 <span id="L29" class="LineNr"> 29 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L30" class="LineNr"> 30 </span><span class="Delimiter">}</span>
 <span id="L31" class="LineNr"> 31 </span>
@@ -179,26 +180,26 @@ if ('onhashchange' in window) {
 <span id="L116" class="LineNr">116 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L117" class="LineNr">117 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- type-check merge instructions in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>    <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;merge&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L121" class="LineNr">121 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L122" class="LineNr">122 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'merge' should yield a single product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L123" class="LineNr">123 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L124" class="LineNr">124 </span>    <span class="Delimiter">}</span>
-<span id="L125" class="LineNr">125 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L126" class="LineNr">126 </span>    <span class="Comment">// Update product While Type-checking Merge</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Normal">const</span> type_tree* product_base_type = product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? product<span class="Delimiter">.</span>type : product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
-<span id="L128" class="LineNr">128 </span>    assert<span class="Delimiter">(</span>product_base_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
-<span id="L129" class="LineNr">129 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>product_base_type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L130" class="LineNr">130 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'merge' should yield a container in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L131" class="LineNr">131 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L132" class="LineNr">132 </span>    <span class="Delimiter">}</span>
-<span id="L133" class="LineNr">133 </span>    <span class="Normal">const</span> type_info&amp; info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
-<span id="L134" class="LineNr">134 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind != <a href='010vm.cc.html#L173'>CONTAINER</a> &amp;&amp; info<span class="Delimiter">.</span>kind != <a href='010vm.cc.html#L174'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L135" class="LineNr">135 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'merge' should yield a container in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L136" class="LineNr">136 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L137" class="LineNr">137 </span>    <span class="Delimiter">}</span>
-<span id="L138" class="LineNr">138 </span>    <a href='031merge.cc.html#L142'>check_merge_call</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">,</span> product<span class="Delimiter">,</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;merge&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'merge' should yield a single product in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Comment">// Update product While Type-checking Merge</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> type_tree* product_base_type = product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? product<span class="Delimiter">.</span>type : product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>product_base_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>product_base_type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'merge' should yield a container in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> type_info&amp; info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> product_base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind != <a href='010vm.cc.html#L173'>CONTAINER</a> &amp;&amp; info<span class="Delimiter">.</span>kind != <a href='010vm.cc.html#L174'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'merge' should yield a container in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <a href='031merge.cc.html#L142'>check_merge_call</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">,</span> product<span class="Delimiter">,</span> caller<span class="Delimiter">,</span> inst<span class="Delimiter">);</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
 <span id="L140" class="LineNr">140 </span><span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>
@@ -207,66 +208,66 @@ if ('onhashchange' in window) {
 <span id="L144" class="LineNr">144 </span>  <a href='031merge.cc.html#L108'>merge_check_state</a> state<span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L147" class="LineNr">147 </span>    assert<span class="Delimiter">(</span>!state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
-<span id="L148" class="LineNr">148 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L149" class="LineNr">149 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L150" class="LineNr">150 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too few ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L151" class="LineNr">151 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L152" class="LineNr">152 </span>    <span class="Delimiter">}</span>
-<span id="L153" class="LineNr">153 </span>    reagent&amp; container = state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">;</span>
-<span id="L154" class="LineNr">154 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!container<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
-<span id="L155" class="LineNr">155 </span>    <span class="Normal">const</span> type_tree* top_root_type = container<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? container<span class="Delimiter">.</span>type : container<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
-<span id="L156" class="LineNr">156 </span>    assert<span class="Delimiter">(</span>top_root_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
-<span id="L157" class="LineNr">157 </span>    type_info&amp; container_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> top_root_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
-<span id="L158" class="LineNr">158 </span>    <span class="Normal">switch</span> <span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>kind<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L159" class="LineNr">159 </span>      <span class="Normal">case</span> <a href='010vm.cc.html#L173'>CONTAINER</a>: <span class="Delimiter">{</span>
-<span id="L160" class="LineNr">160 </span>        <span class="Comment">// degenerate case: merge with the same type always succeeds</span>
-<span id="L161" class="LineNr">161 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span> &amp;&amp; <a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
-<span id="L162" class="LineNr">162 </span>          <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L163" class="LineNr">163 </span>        <span class="Normal">const</span> reagent&amp; expected_ingredient = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>container<span class="Delimiter">.</span>type<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">);</span>
-<span id="L164" class="LineNr">164 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking container &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>container<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; || &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L165" class="LineNr">165 </span>        <span class="Comment">// if the current element is the ingredient we expect, move on to the next element/ingredient</span>
-<span id="L166" class="LineNr">166 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L167" class="LineNr">167 </span>          ++ingredient_index<span class="Delimiter">;</span>
-<span id="L168" class="LineNr">168 </span>          ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
-<span id="L169" class="LineNr">169 </span>          <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get_base_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>            state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
-<span id="L171" class="LineNr">171 </span>            <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L172" class="LineNr">172 </span>              <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
-<span id="L173" class="LineNr">173 </span>                <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too many ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L174" class="LineNr">174 </span>              <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L175" class="LineNr">175 </span>            <span class="Delimiter">}</span>
-<span id="L176" class="LineNr">176 </span>            ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
-<span id="L177" class="LineNr">177 </span>          <span class="Delimiter">}</span>
-<span id="L178" class="LineNr">178 </span>        <span class="Delimiter">}</span>
-<span id="L179" class="LineNr">179 </span>        <span class="Comment">// if not, maybe it's a field of the current element</span>
-<span id="L180" class="LineNr">180 </span>        <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L181" class="LineNr">181 </span>          <span class="Comment">// no change to ingredient_index</span>
-<span id="L182" class="LineNr">182 </span>          state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
-<span id="L183" class="LineNr">183 </span>        <span class="Delimiter">}</span>
-<span id="L184" class="LineNr">184 </span>        <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L185" class="LineNr">185 </span>      <span class="Delimiter">}</span>
-<span id="L186" class="LineNr">186 </span>      <span class="Comment">// End check_merge_call Special-cases</span>
-<span id="L187" class="LineNr">187 </span>      <span class="Normal">default</span>: <span class="Delimiter">{</span>
-<span id="L188" class="LineNr">188 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>container<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L189" class="LineNr">189 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;incorrect type of ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L190" class="LineNr">190 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (expected '&quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>container<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L191" class="LineNr">191 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (got '&quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L192" class="LineNr">192 </span>          <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L193" class="LineNr">193 </span>        <span class="Delimiter">}</span>
-<span id="L194" class="LineNr">194 </span>        ++ingredient_index<span class="Delimiter">;</span>
-<span id="L195" class="LineNr">195 </span>        <span class="Comment">// ++state.data.top().container_element_index;  // unnecessary, but wouldn't do any harm</span>
-<span id="L196" class="LineNr">196 </span>        <span class="Normal">do</span> <span class="Delimiter">{</span>
-<span id="L197" class="LineNr">197 </span>          state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
-<span id="L198" class="LineNr">198 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L199" class="LineNr">199 </span>            <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
-<span id="L200" class="LineNr">200 </span>              <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too many ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L201" class="LineNr">201 </span>            <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L202" class="LineNr">202 </span>          <span class="Delimiter">}</span>
-<span id="L203" class="LineNr">203 </span>          ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
-<span id="L204" class="LineNr">204 </span>        <span class="Delimiter">}</span> <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get_base_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">));</span>
-<span id="L205" class="LineNr">205 </span>      <span class="Delimiter">}</span>
-<span id="L206" class="LineNr">206 </span>    <span class="Delimiter">}</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; vs &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too few ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> reagent&amp; container = state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">;</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!container<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> type_tree* top_root_type = container<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? container<span class="Delimiter">.</span>type : container<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>top_root_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> type_info&amp; container_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> top_root_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Normal">switch</span> <span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>kind<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> <a href='010vm.cc.html#L173'>CONTAINER</a>: <span class="Delimiter">{</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// degenerate case: merge with the same type always succeeds</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span> &amp;&amp; <a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; expected_ingredient = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>container<span class="Delimiter">.</span>type<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">);</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking container &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>container<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; || &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// if the current element is the ingredient we expect, move on to the next element/ingredient</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++ingredient_index<span class="Delimiter">;</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get_base_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too many ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// if not, maybe it's a field of the current element</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// no change to ingredient_index</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>push<span class="Delimiter">(</span>merge_check_point<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End check_merge_call Special-cases</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">default</span>: <span class="Delimiter">{</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>container<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;incorrect type of ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (expected '&quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>container<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (got '&quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++ingredient_index<span class="Delimiter">;</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// ++state.data.top().container_element_index;  // unnecessary, but wouldn't do any harm</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">do</span> <span class="Delimiter">{</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">))</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;too many ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span> <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get_base_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">));</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Delimiter">}</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Comment">// never gets here</span>
 <span id="L209" class="LineNr">209 </span>  assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
diff --git a/html/032array.cc.html b/html/032array.cc.html
index 71876de7..d95b2a46 100644
--- a/html/032array.cc.html
+++ b/html/032array.cc.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
 -->
 </style>
@@ -83,30 +84,30 @@ if ('onhashchange' in window) {
 <span id="L20" class="LineNr"> 20 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L21" class="LineNr"> 21 </span><span class="Normal">case</span> CREATE_ARRAY: <span class="Delimiter">{</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L23" class="LineNr"> 23 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'create-array' needs one product and no ingredients but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L24" class="LineNr"> 24 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'create-array' needs one product and no ingredients but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Delimiter">}</span>
 <span id="L26" class="LineNr"> 26 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Comment">// Update CREATE_ARRAY product in Check</span>
 <span id="L28" class="LineNr"> 28 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_array<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L29" class="LineNr"> 29 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'create-array' cannot create non-array '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L30" class="LineNr"> 30 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'create-array' cannot create non-array '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L31" class="LineNr"> 31 </span>  <span class="Delimiter">}</span>
 <span id="L32" class="LineNr"> 32 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L33" class="LineNr"> 33 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;create array of what? '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L34" class="LineNr"> 34 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;create array of what? '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Delimiter">}</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Comment">// 'create-array' will need to check properties rather than types</span>
 <span id="L37" class="LineNr"> 37 </span>  type_tree* array_length_from_type = product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!array_length_from_type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L39" class="LineNr"> 39 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;create array of what size? '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L40" class="LineNr"> 40 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;create array of what size? '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L41" class="LineNr"> 41 </span>  <span class="Delimiter">}</span>
 <span id="L42" class="LineNr"> 42 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L43" class="LineNr"> 43 </span>    array_length_from_type = array_length_from_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> array_length_from_type = array_length_from_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>array_length_from_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L45" class="LineNr"> 45 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'create-array' product should specify size of array after its element type, but got '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L46" class="LineNr"> 46 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'create-array' product should specify size of array after its element type, but got '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L49" class="LineNr"> 49 </span><span class="Delimiter">}</span>
@@ -117,7 +118,7 @@ if ('onhashchange' in window) {
 <span id="L54" class="LineNr"> 54 </span>  <span class="Normal">int</span> base_address = product<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L55" class="LineNr"> 55 </span>  type_tree* array_length_from_type = product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L57" class="LineNr"> 57 </span>    array_length_from_type = array_length_from_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> array_length_from_type = array_length_from_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L58" class="LineNr"> 58 </span>  <span class="Normal">int</span> <a href='032array.cc.html#L386'>array_length</a> = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>array_length_from_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L59" class="LineNr"> 59 </span>  <span class="Comment">// initialize array length, so that size_of will work</span>
 <span id="L60" class="LineNr"> 60 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; <a href='032array.cc.html#L386'>array_length</a> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; base_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -126,7 +127,7 @@ if ('onhashchange' in window) {
 <span id="L63" class="LineNr"> 63 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;creating array of size &quot;</span> &lt;&lt; size &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Comment">// initialize array</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt;= size_of<span class="Delimiter">(</span>product<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address+i<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address+i<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Delimiter">}</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Comment">// no need to update product</span>
 <span id="L69" class="LineNr"> 69 </span>  <span class="Identifier">goto</span> finish_instruction<span class="Delimiter">;</span>
@@ -168,8 +169,8 @@ if ('onhashchange' in window) {
 <span id="L105" class="LineNr">105 </span><span class="Delimiter">:(before &quot;End size_of(reagent r) Special-cases&quot;)</span>
 <span id="L106" class="LineNr">106 </span><span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom &amp;&amp; r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L108" class="LineNr">108 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; r<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' is an array of what?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L109" class="LineNr">109 </span>    <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; r<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' is an array of what?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Delimiter">}</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Identifier">return</span> <span class="Comment">/*</span><span class="Comment">space for length</span><span class="Comment">*/</span><span class="Constant">1</span> + <a href='032array.cc.html#L386'>array_length</a><span class="Delimiter">(</span>r<span class="Delimiter">)</span>*size_of<span class="Delimiter">(</span><a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">));</span>
 <span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
@@ -179,9 +180,9 @@ if ('onhashchange' in window) {
 <span id="L116" class="LineNr">116 </span><span class="Delimiter">:(code)</span>
 <span id="L117" class="LineNr">117 </span><span class="Normal">int</span> <a href='032array.cc.html#L117'>static_array_length</a><span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom &amp;&amp; type<span class="Delimiter">-&gt;</span>right &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom &amp;&amp; type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right  <span class="Comment">// exactly 3 types</span>
-<span id="L119" class="LineNr">119 </span>      &amp;&amp; type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left &amp;&amp; type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; <a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// third 'type' is a number</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Comment">// get size from type</span>
-<span id="L121" class="LineNr">121 </span>    <span class="Identifier">return</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left &amp;&amp; type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; <a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// third 'type' is a number</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Comment">// get size from type</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Delimiter">}</span>
 <span id="L123" class="LineNr">123 </span>  cerr &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L124" class="LineNr">124 </span>  assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
@@ -218,18 +219,18 @@ if ('onhashchange' in window) {
 <span id="L155" class="LineNr">155 </span><span class="Delimiter">{</span>
 <span id="L156" class="LineNr">156 </span>  <span class="Normal">const</span> type_tree* type = info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>type<span class="Delimiter">;</span>
 <span id="L157" class="LineNr">157 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type &amp;&amp; type<span class="Delimiter">-&gt;</span>atom &amp;&amp; type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;array&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L158" class="LineNr">158 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' doesn't specify type of array elements for '&quot;</span> &lt;&lt; info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L159" class="LineNr">159 </span>    <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' doesn't specify type of array elements for '&quot;</span> &lt;&lt; info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Delimiter">}</span>
 <span id="L161" class="LineNr">161 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type &amp;&amp; !type<span class="Delimiter">-&gt;</span>atom &amp;&amp; type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;array&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L162" class="LineNr">162 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L163" class="LineNr">163 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' doesn't specify type of array elements for '&quot;</span> &lt;&lt; info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L164" class="LineNr">164 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L165" class="LineNr">165 </span>    <span class="Delimiter">}</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right || !is_integer<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// array has no length</span>
-<span id="L167" class="LineNr">167 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' cannot determine size of element '&quot;</span> &lt;&lt; info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L168" class="LineNr">168 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L169" class="LineNr">169 </span>    <span class="Delimiter">}</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' doesn't specify type of array elements for '&quot;</span> &lt;&lt; info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right || !is_integer<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// array has no length</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;container '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' cannot determine size of element '&quot;</span> &lt;&lt; info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>back<span class="Delimiter">().</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L170" class="LineNr">170 </span>  <span class="Delimiter">}</span>
 <span id="L171" class="LineNr">171 </span><span class="Delimiter">}</span>
 <span id="L172" class="LineNr">172 </span>
@@ -237,7 +238,7 @@ if ('onhashchange' in window) {
 <span id="L174" class="LineNr">174 </span><span class="Comment">//: can contain arrays, and since we already do plenty of checking for them</span>
 <span id="L175" class="LineNr">175 </span><span class="Delimiter">:(before &quot;End size_mismatch(x) Special-cases&quot;)</span>
 <span id="L176" class="LineNr">176 </span><span class="Normal">if</span> <span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>running_step_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> current_call<span class="Delimiter">().</span>running_recipe<span class="Delimiter">).</span>steps<span class="Delimiter">)</span>
-<span id="L177" class="LineNr">177 </span>    &amp;&amp; current_instruction<span class="Delimiter">().</span>operation == MERGE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> &amp;&amp; current_instruction<span class="Delimiter">().</span>operation == MERGE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L178" class="LineNr">178 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L179" class="LineNr">179 </span><span class="Delimiter">}</span>
 <span id="L180" class="LineNr">180 </span>
@@ -372,20 +373,20 @@ if ('onhashchange' in window) {
 <span id="L309" class="LineNr">309 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L310" class="LineNr">310 </span><span class="Normal">case</span> INDEX: <span class="Delimiter">{</span>
 <span id="L311" class="LineNr">311 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L312" class="LineNr">312 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'index' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L313" class="LineNr">313 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'index' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Delimiter">}</span>
 <span id="L315" class="LineNr">315 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L316" class="LineNr">316 </span>  <span class="Comment">// Update INDEX base in Check</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_array<span class="Delimiter">(</span>base<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L318" class="LineNr">318 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'index' on a non-array '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L319" class="LineNr">319 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'index' on a non-array '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L320" class="LineNr">320 </span>  <span class="Delimiter">}</span>
 <span id="L321" class="LineNr">321 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> index = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L322" class="LineNr">322 </span>  <span class="Comment">// Update INDEX index in Check</span>
 <span id="L323" class="LineNr">323 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>index<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L324" class="LineNr">324 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'index' should be a number, but got '&quot;</span> &lt;&lt; index<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L325" class="LineNr">325 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'index' should be a number, but got '&quot;</span> &lt;&lt; index<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L326" class="LineNr">326 </span>  <span class="Delimiter">}</span>
 <span id="L327" class="LineNr">327 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L328" class="LineNr">328 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -393,8 +394,8 @@ if ('onhashchange' in window) {
 <span id="L330" class="LineNr">330 </span>  reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
 <span id="L331" class="LineNr">331 </span>  element<span class="Delimiter">.</span>type = <a href='032array.cc.html#L366'>copy_array_element</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L332" class="LineNr">332 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span> element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L333" class="LineNr">333 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'index' on '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' can't be saved in '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'; type should be '&quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L334" class="LineNr">334 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'index' on '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' can't be saved in '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'; type should be '&quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L335" class="LineNr">335 </span>  <span class="Delimiter">}</span>
 <span id="L336" class="LineNr">336 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L337" class="LineNr">337 </span><span class="Delimiter">}</span>
@@ -405,15 +406,15 @@ if ('onhashchange' in window) {
 <span id="L342" class="LineNr">342 </span>  <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L343" class="LineNr">343 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;base <a href='043space.cc.html#L76'>address</a> is &quot;</span> &lt;&lt; base_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L344" class="LineNr">344 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L345" class="LineNr">345 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L346" class="LineNr">346 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L347" class="LineNr">347 </span>  <span class="Delimiter">}</span>
 <span id="L348" class="LineNr">348 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> index = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L349" class="LineNr">349 </span>  <span class="Comment">// Update INDEX index in Run</span>
 <span id="L350" class="LineNr">350 </span>  vector&lt;<span class="Normal">double</span>&gt; index_val<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>index<span class="Delimiter">));</span>
 <span id="L351" class="LineNr">351 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt; <span class="Constant">0</span> || index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt;= <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L352" class="LineNr">352 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;invalid index &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L353" class="LineNr">353 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;invalid index &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L354" class="LineNr">354 </span>  <span class="Delimiter">}</span>
 <span id="L355" class="LineNr">355 </span>  reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
 <span id="L356" class="LineNr">356 </span>  element<span class="Delimiter">.</span>type = <a href='032array.cc.html#L366'>copy_array_element</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
@@ -433,15 +434,15 @@ if ('onhashchange' in window) {
 <span id="L370" class="LineNr">370 </span>type_tree* <a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L371" class="LineNr">371 </span>  assert<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
 <span id="L372" class="LineNr">372 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L373" class="LineNr">373 </span>    <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L374" class="LineNr">374 </span>  <span class="Delimiter">}</span>
 <span id="L375" class="LineNr">375 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L376" class="LineNr">376 </span>    <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L377" class="LineNr">377 </span>  <span class="Delimiter">}</span>
 <span id="L378" class="LineNr">378 </span>  <span class="Comment">// hack: support array:num:3 without requiring extra parens</span>
 <span id="L379" class="LineNr">379 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left &amp;&amp; type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; <a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L380" class="LineNr">380 </span>    assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
-<span id="L381" class="LineNr">381 </span>    <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L380" class="LineNr">380 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L382" class="LineNr">382 </span>  <span class="Delimiter">}</span>
 <span id="L383" class="LineNr">383 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L384" class="LineNr">384 </span><span class="Delimiter">}</span>
@@ -450,9 +451,9 @@ if ('onhashchange' in window) {
 <span id="L387" class="LineNr">387 </span>  <span class="Comment">// x should already be canonized.</span>
 <span id="L388" class="LineNr">388 </span>  <span class="Comment">// hack: look for length in type</span>
 <span id="L389" class="LineNr">389 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>atom &amp;&amp; !x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right  <span class="Comment">// exactly 3 types</span>
-<span id="L390" class="LineNr">390 </span>      &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; <a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// third 'type' is a number</span>
-<span id="L391" class="LineNr">391 </span>    <span class="Comment">// get size from type</span>
-<span id="L392" class="LineNr">392 </span>    <span class="Identifier">return</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left &amp;&amp; x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; <a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// third 'type' is a number</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> <span class="Comment">// get size from type</span>
+<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L393" class="LineNr">393 </span>  <span class="Delimiter">}</span>
 <span id="L394" class="LineNr">394 </span>  <span class="Comment">// this should never happen at transform time</span>
 <span id="L395" class="LineNr">395 </span>  <span class="Identifier">return</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
@@ -465,7 +466,7 @@ if ('onhashchange' in window) {
 <span id="L402" class="LineNr">402 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">15</span><span class="Delimiter">);</span>
 <span id="L403" class="LineNr">403 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">,</span> <span class="Constant">16</span><span class="Delimiter">);</span>
 <span id="L404" class="LineNr">404 </span>  reagent x<span class="Delimiter">(</span><span class="Constant">&quot;1:array:<a href='043space.cc.html#L76'>address</a>:num&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// 3 types, but not a static array</span>
-<span id="L405" class="LineNr">405 </span>  <a href='012transform.cc.html#L90'>populate_value</a><span class="Delimiter">(</span>x<span class="Delimiter">);</span>
+<span id="L405" class="LineNr">405 </span>  <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L406" class="LineNr">406 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='032array.cc.html#L386'>array_length</a><span class="Delimiter">(</span>x<span class="Delimiter">),</span> <span class="Constant">3</span><span class="Delimiter">);</span>
 <span id="L407" class="LineNr">407 </span><span class="Delimiter">}</span>
 <span id="L408" class="LineNr">408 </span>
@@ -558,33 +559,33 @@ if ('onhashchange' in window) {
 <span id="L495" class="LineNr">495 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L496" class="LineNr">496 </span><span class="Normal">case</span> PUT_INDEX: <span class="Delimiter">{</span>
 <span id="L497" class="LineNr">497 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">3</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L498" class="LineNr">498 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put-index' expects exactly 3 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L499" class="LineNr">499 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put-index' expects exactly 3 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L500" class="LineNr">500 </span>  <span class="Delimiter">}</span>
 <span id="L501" class="LineNr">501 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L502" class="LineNr">502 </span>  <span class="Comment">// Update PUT_INDEX base in Check</span>
 <span id="L503" class="LineNr">503 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_array<span class="Delimiter">(</span>base<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L504" class="LineNr">504 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put-index' on a non-array '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L505" class="LineNr">505 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L504" class="LineNr">504 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put-index' on a non-array '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L505" class="LineNr">505 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L506" class="LineNr">506 </span>  <span class="Delimiter">}</span>
 <span id="L507" class="LineNr">507 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> index = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L508" class="LineNr">508 </span>  <span class="Comment">// Update PUT_INDEX index in Check</span>
 <span id="L509" class="LineNr">509 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>index<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L510" class="LineNr">510 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'put-index' should have type 'number', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L511" class="LineNr">511 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L510" class="LineNr">510 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'put-index' should have type 'number', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L511" class="LineNr">511 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L512" class="LineNr">512 </span>  <span class="Delimiter">}</span>
 <span id="L513" class="LineNr">513 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> value = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
 <span id="L514" class="LineNr">514 </span>  <span class="Comment">// Update PUT_INDEX value in Check</span>
 <span id="L515" class="LineNr">515 </span>  reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
 <span id="L516" class="LineNr">516 </span>  element<span class="Delimiter">.</span>type = <a href='032array.cc.html#L366'>copy_array_element</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L517" class="LineNr">517 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>element<span class="Delimiter">,</span> value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L518" class="LineNr">518 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put-index &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' should store &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; value<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>value<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L519" class="LineNr">519 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'put-index &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' should store &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; value<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>value<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L519" class="LineNr">519 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L520" class="LineNr">520 </span>  <span class="Delimiter">}</span>
 <span id="L521" class="LineNr">521 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// no more checks necessary</span>
 <span id="L522" class="LineNr">522 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name != inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L523" class="LineNr">523 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'put-index' must be first ingredient '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L524" class="LineNr">524 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'put-index' must be first ingredient '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L524" class="LineNr">524 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L525" class="LineNr">525 </span>  <span class="Delimiter">}</span>
 <span id="L526" class="LineNr">526 </span>  <span class="Comment">// End PUT_INDEX Product Checks</span>
 <span id="L527" class="LineNr">527 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -595,15 +596,15 @@ if ('onhashchange' in window) {
 <span id="L532" class="LineNr">532 </span>  <span class="Comment">// Update PUT_INDEX base in Run</span>
 <span id="L533" class="LineNr">533 </span>  <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L534" class="LineNr">534 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L535" class="LineNr">535 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L536" class="LineNr">536 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L536" class="LineNr">536 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L537" class="LineNr">537 </span>  <span class="Delimiter">}</span>
 <span id="L538" class="LineNr">538 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> index = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L539" class="LineNr">539 </span>  <span class="Comment">// Update PUT_INDEX index in Run</span>
 <span id="L540" class="LineNr">540 </span>  vector&lt;<span class="Normal">double</span>&gt; index_val<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>index<span class="Delimiter">));</span>
 <span id="L541" class="LineNr">541 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt; <span class="Constant">0</span> || index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &gt;= <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L542" class="LineNr">542 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;invalid index &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L543" class="LineNr">543 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;invalid index &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L544" class="LineNr">544 </span>  <span class="Delimiter">}</span>
 <span id="L545" class="LineNr">545 </span>  <span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = base_address + <span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span> + index_val<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>*size_of<span class="Delimiter">(</span><a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">));</span>
 <span id="L546" class="LineNr">546 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy to is &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -612,8 +613,8 @@ if ('onhashchange' in window) {
 <span id="L549" class="LineNr">549 </span>  vector&lt;<span class="Normal">double</span>&gt; value = read_memory<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">));</span>
 <span id="L550" class="LineNr">550 </span>  <span class="Comment">// Write Memory in PUT_INDEX in Run</span>
 <span id="L551" class="LineNr">551 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>value<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L552" class="LineNr">552 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>value<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; address+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L553" class="LineNr">553 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">,</span> value<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L552" class="LineNr">552 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>value<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; address+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L553" class="LineNr">553 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">,</span> value<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L554" class="LineNr">554 </span>  <span class="Delimiter">}</span>
 <span id="L555" class="LineNr">555 </span>  <span class="Identifier">goto</span> finish_instruction<span class="Delimiter">;</span>
 <span id="L556" class="LineNr">556 </span><span class="Delimiter">}</span>
@@ -677,14 +678,14 @@ if ('onhashchange' in window) {
 <span id="L614" class="LineNr">614 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L615" class="LineNr">615 </span><span class="Normal">case</span> LENGTH: <span class="Delimiter">{</span>
 <span id="L616" class="LineNr">616 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L617" class="LineNr">617 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'length' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L618" class="LineNr">618 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L617" class="LineNr">617 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'length' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L618" class="LineNr">618 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L619" class="LineNr">619 </span>  <span class="Delimiter">}</span>
 <span id="L620" class="LineNr">620 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> array = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L621" class="LineNr">621 </span>  <span class="Comment">// Update LENGTH array in Check</span>
 <span id="L622" class="LineNr">622 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_array<span class="Delimiter">(</span>array<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L623" class="LineNr">623 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;tried to calculate length of non-array '&quot;</span> &lt;&lt; array<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L624" class="LineNr">624 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L623" class="LineNr">623 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;tried to calculate length of non-array '&quot;</span> &lt;&lt; array<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L624" class="LineNr">624 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L625" class="LineNr">625 </span>  <span class="Delimiter">}</span>
 <span id="L626" class="LineNr">626 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L627" class="LineNr">627 </span><span class="Delimiter">}</span>
@@ -693,8 +694,8 @@ if ('onhashchange' in window) {
 <span id="L630" class="LineNr">630 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> array = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L631" class="LineNr">631 </span>  <span class="Comment">// Update LENGTH array in Run</span>
 <span id="L632" class="LineNr">632 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>array<span class="Delimiter">.</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L633" class="LineNr">633 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L634" class="LineNr">634 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L633" class="LineNr">633 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L634" class="LineNr">634 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L635" class="LineNr">635 </span>  <span class="Delimiter">}</span>
 <span id="L636" class="LineNr">636 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L637" class="LineNr">637 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> array<span class="Delimiter">.</span>value<span class="Delimiter">));</span>
diff --git a/html/033exclusive_container.cc.html b/html/033exclusive_container.cc.html
index 424b892a..96f2c6fd 100644
--- a/html/033exclusive_container.cc.html
+++ b/html/033exclusive_container.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
 .SalientComment { color: #00ffff; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muRecipe { color: #ff8700; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
-.Identifier { color: #c0a020; }
 .cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
+.Identifier { color: #c0a020; }
 -->
 </style>
 
@@ -110,11 +111,11 @@ if ('onhashchange' in window) {
 <span id="L47" class="LineNr"> 47 </span>  <span class="Comment">// include their length in the type.)</span>
 <span id="L48" class="LineNr"> 48 </span>  container_metadata metadata<span class="Delimiter">;</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>exclusive_container_info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L50" class="LineNr"> 50 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = exclusive_container_info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L51" class="LineNr"> 51 </span>    <span class="Comment">// Compute Exclusive Container Size(element, full_type)</span>
-<span id="L52" class="LineNr"> 52 </span>    compute_container_sizes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L53" class="LineNr"> 53 </span>    <span class="Normal">int</span> variant_size = size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
-<span id="L54" class="LineNr"> 54 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variant_size &gt; metadata<span class="Delimiter">.</span>size<span class="Delimiter">)</span> metadata<span class="Delimiter">.</span>size = variant_size<span class="Delimiter">;</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = exclusive_container_info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Comment">// Compute Exclusive Container Size(element, full_type)</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> compute_container_sizes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> pending_metadata<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> variant_size = size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variant_size &gt; metadata<span class="Delimiter">.</span>size<span class="Delimiter">)</span> metadata<span class="Delimiter">.</span>size = variant_size<span class="Delimiter">;</span>
 <span id="L55" class="LineNr"> 55 </span>  <span class="Delimiter">}</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Comment">// ...+1 for its tag.</span>
 <span id="L57" class="LineNr"> 57 </span>  ++metadata<span class="Delimiter">.</span>size<span class="Delimiter">;</span>
@@ -163,48 +164,48 @@ if ('onhashchange' in window) {
 <span id="L100" class="LineNr">100 </span><span class="Normal">case</span> MAYBE_CONVERT: <span class="Delimiter">{</span>
 <span id="L101" class="LineNr">101 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L103" class="LineNr">103 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'maybe-convert' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L104" class="LineNr">104 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'maybe-convert' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Delimiter">}</span>
 <span id="L106" class="LineNr">106 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Comment">// Update MAYBE_CONVERT base in Check</span>
 <span id="L108" class="LineNr">108 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L109" class="LineNr">109 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'maybe-convert' should be an exclusive-container, but got '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L110" class="LineNr">110 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'maybe-convert' should be an exclusive-container, but got '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Delimiter">}</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Normal">const</span> type_tree* base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Comment">// Update MAYBE_CONVERT base_type in Check</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base_type<span class="Delimiter">-&gt;</span>atom || base_type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind != <a href='010vm.cc.html#L174'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L115" class="LineNr">115 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'maybe-convert' should be an exclusive-container, but got '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L116" class="LineNr">116 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'maybe-convert' should be an exclusive-container, but got '&quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Delimiter">}</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'maybe-convert' should have type 'variant', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'maybe-convert' should have type 'variant', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L124" class="LineNr">124 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'maybe-convert' expects exactly 2 products in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L125" class="LineNr">125 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'maybe-convert' expects exactly 2 products in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L126" class="LineNr">126 </span>  <span class="Delimiter">}</span>
 <span id="L127" class="LineNr">127 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L128" class="LineNr">128 </span>  <span class="Comment">// Update MAYBE_CONVERT product in Check</span>
 <span id="L129" class="LineNr">129 </span>  reagent&amp; offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L130" class="LineNr">130 </span>  <a href='012transform.cc.html#L90'>populate_value</a><span class="Delimiter">(</span>offset<span class="Delimiter">);</span>
+<span id="L130" class="LineNr">130 </span>  <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>offset<span class="Delimiter">);</span>
 <span id="L131" class="LineNr">131 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>offset<span class="Delimiter">.</span>value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L132" class="LineNr">132 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid tag &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L133" class="LineNr">133 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid tag &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">&quot; in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Delimiter">}</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Normal">const</span> reagent&amp; variant = variant_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>product<span class="Delimiter">,</span> variant<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L137" class="LineNr">137 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'maybe-convert &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L138" class="LineNr">138 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'maybe-convert &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
 <span id="L140" class="LineNr">140 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> status = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Comment">// Update MAYBE_CONVERT status in Check</span>
 <span id="L142" class="LineNr">142 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_boolean<span class="Delimiter">(</span>status<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L143" class="LineNr">143 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second product yielded by 'maybe-convert' should be a boolean, but tried to write to '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L144" class="LineNr">144 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second product yielded by 'maybe-convert' should be a boolean, but tried to write to '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Delimiter">}</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L147" class="LineNr">147 </span><span class="Delimiter">}</span>
@@ -214,8 +215,8 @@ if ('onhashchange' in window) {
 <span id="L151" class="LineNr">151 </span>  <span class="Comment">// Update MAYBE_CONVERT base in Run</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L153" class="LineNr">153 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L154" class="LineNr">154 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L155" class="LineNr">155 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L156" class="LineNr">156 </span>  <span class="Delimiter">}</span>
 <span id="L157" class="LineNr">157 </span>  <span class="Normal">int</span> tag = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">;</span>
 <span id="L158" class="LineNr">158 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -224,21 +225,21 @@ if ('onhashchange' in window) {
 <span id="L161" class="LineNr">161 </span>  <span class="Comment">// Update MAYBE_CONVERT status in Run</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Comment">// optimization: directly write results to only update first product when necessary</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>tag == <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>    <span class="Normal">const</span> reagent&amp; variant = variant_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> tag<span class="Delimiter">);</span>
-<span id="L165" class="LineNr">165 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 1 in location &quot;</span> &lt;&lt; status<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L166" class="LineNr">166 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> status<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L168" class="LineNr">168 </span>      <span class="Comment">// Write Memory in Successful MAYBE_CONVERT in Run</span>
-<span id="L169" class="LineNr">169 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; size_of<span class="Delimiter">(</span>variant<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>        <span class="Normal">double</span> val = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+i<span class="Delimiter">);</span>
-<span id="L171" class="LineNr">171 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>val<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>value+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L172" class="LineNr">172 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> product<span class="Delimiter">.</span>value+i<span class="Delimiter">,</span> val<span class="Delimiter">);</span>
-<span id="L173" class="LineNr">173 </span>      <span class="Delimiter">}</span>
-<span id="L174" class="LineNr">174 </span>    <span class="Delimiter">}</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; variant = variant_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> tag<span class="Delimiter">);</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 1 in location &quot;</span> &lt;&lt; status<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> status<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Write Memory in Successful MAYBE_CONVERT in Run</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; size_of<span class="Delimiter">(</span>variant<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">double</span> val = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+i<span class="Delimiter">);</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>val<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>value+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> product<span class="Delimiter">.</span>value+i<span class="Delimiter">,</span> val<span class="Delimiter">);</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Delimiter">}</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L177" class="LineNr">177 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 0 in location &quot;</span> &lt;&lt; status<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L178" class="LineNr">178 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> status<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 0 in location &quot;</span> &lt;&lt; status<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> status<span class="Delimiter">.</span>value<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Delimiter">}</span>
 <span id="L180" class="LineNr">180 </span>  <span class="Identifier">goto</span> finish_instruction<span class="Delimiter">;</span>
 <span id="L181" class="LineNr">181 </span><span class="Delimiter">}</span>
@@ -383,16 +384,16 @@ if ('onhashchange' in window) {
 <span id="L320" class="LineNr">320 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking exclusive container &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>container<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L321" class="LineNr">321 </span>  <span class="Comment">// easy case: exact match</span>
 <span id="L322" class="LineNr">322 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
-<span id="L323" class="LineNr">323 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L324" class="LineNr">324 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L325" class="LineNr">325 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; of 'merge' should be a literal, for the tag of exclusive-container '&quot;</span> &lt;&lt; container_info<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L326" class="LineNr">326 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; of 'merge' should be a literal, for the tag of exclusive-container '&quot;</span> &lt;&lt; container_info<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L326" class="LineNr">326 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L327" class="LineNr">327 </span>  <span class="Delimiter">}</span>
 <span id="L328" class="LineNr">328 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">);</span>  <span class="Comment">// unnecessary copy just to keep this function from modifying caller</span>
-<span id="L329" class="LineNr">329 </span>  <a href='012transform.cc.html#L90'>populate_value</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
+<span id="L329" class="LineNr">329 </span>  <a href='012transform.cc.html#L91'>populate_value</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
 <span id="L330" class="LineNr">330 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient<span class="Delimiter">.</span>value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L331" class="LineNr">331 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid tag at &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; for '&quot;</span> &lt;&lt; container_info<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L332" class="LineNr">332 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L331" class="LineNr">331 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid tag at &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <span class="Constant">&quot; for '&quot;</span> &lt;&lt; container_info<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L333" class="LineNr">333 </span>  <span class="Delimiter">}</span>
 <span id="L334" class="LineNr">334 </span>  <span class="Normal">const</span> reagent&amp; variant = variant_type<span class="Delimiter">(</span>container<span class="Delimiter">,</span> ingredient<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
 <span id="L335" class="LineNr">335 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;tag: &quot;</span> &lt;&lt; ingredient<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -500,15 +501,15 @@ if ('onhashchange' in window) {
 <span id="L437" class="LineNr">437 </span><span class="Comment">//: different sizes, relax the size mismatch check for 'merge' instructions.</span>
 <span id="L438" class="LineNr">438 </span><span class="Delimiter">:(before &quot;End size_mismatch(x) Special-cases&quot;)</span>
 <span id="L439" class="LineNr">439 </span><span class="Normal">if</span> <span class="Delimiter">(</span>current_step_index<span class="Delimiter">()</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>steps<span class="Delimiter">())</span>
-<span id="L440" class="LineNr">440 </span>    &amp;&amp; current_instruction<span class="Delimiter">().</span>operation == MERGE
-<span id="L441" class="LineNr">441 </span>    &amp;&amp; !current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
-<span id="L442" class="LineNr">442 </span>    &amp;&amp; current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L440" class="LineNr">440 </span>  <span class="Conceal">¦</span> &amp;&amp; current_instruction<span class="Delimiter">().</span>operation == MERGE
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span> &amp;&amp; !current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
+<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> &amp;&amp; current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L443" class="LineNr">443 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> x = current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L444" class="LineNr">444 </span>  <span class="Comment">// Update size_mismatch Check for MERGE(x)</span>
 <span id="L445" class="LineNr">445 </span>  <span class="Normal">const</span> type_tree* root_type = x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? x<span class="Delimiter">.</span>type : x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L446" class="LineNr">446 </span>  assert<span class="Delimiter">(</span>root_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L447" class="LineNr">447 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> root_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind == <a href='010vm.cc.html#L174'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span>
-<span id="L448" class="LineNr">448 </span>    <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">);</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>data<span class="Delimiter">);</span>
 <span id="L449" class="LineNr">449 </span><span class="Delimiter">}</span>
 <span id="L450" class="LineNr">450 </span>
 <span id="L451" class="LineNr">451 </span><span class="Delimiter">:(scenario merge_exclusive_container_with_mismatched_sizes)</span>
diff --git a/html/034address.cc.html b/html/034address.cc.html
index 0b70cbc9..a7924cd6 100644
--- a/html/034address.cc.html
+++ b/html/034address.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
-.CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -225,26 +226,26 @@ if ('onhashchange' in window) {
 <span id="L163" class="LineNr">163 </span><span class="Normal">case</span> NEW: <span class="Delimiter">{</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L166" class="LineNr">166 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'new' requires one or two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'new' requires one or two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Delimiter">}</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Comment">// End NEW Check Special-cases</span>
 <span id="L170" class="LineNr">170 </span>  <span class="Normal">const</span> reagent&amp; type = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L171" class="LineNr">171 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_type_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L172" class="LineNr">172 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'new' should be a type, but got '&quot;</span> &lt;&lt; type<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L173" class="LineNr">173 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'new' should be a type, but got '&quot;</span> &lt;&lt; type<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L176" class="LineNr">176 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'new' should be a number (array length), but got '&quot;</span> &lt;&lt; type<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L177" class="LineNr">177 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'new' should be a number (array length), but got '&quot;</span> &lt;&lt; type<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L178" class="LineNr">178 </span>  <span class="Delimiter">}</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L180" class="LineNr">180 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;result of 'new' should never be ignored</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L181" class="LineNr">181 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;result of 'new' should never be ignored</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Delimiter">}</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!product_of_new_is_valid<span class="Delimiter">(</span>inst<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L184" class="LineNr">184 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'new' has incorrect type: '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L185" class="LineNr">185 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'new' has incorrect type: '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L186" class="LineNr">186 </span>  <span class="Delimiter">}</span>
 <span id="L187" class="LineNr">187 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L188" class="LineNr">188 </span><span class="Delimiter">}</span>
@@ -253,13 +254,13 @@ if ('onhashchange' in window) {
 <span id="L191" class="LineNr">191 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L192" class="LineNr">192 </span>  <span class="Comment">// Update NEW product in Check</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!product<span class="Delimiter">.</span>type || product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span>
-<span id="L194" class="LineNr">194 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L195" class="LineNr">195 </span>  drop_from_type<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
 <span id="L196" class="LineNr">196 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L197" class="LineNr">197 </span>    <span class="Comment">// array allocation</span>
-<span id="L198" class="LineNr">198 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!product<span class="Delimiter">.</span>type || product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">))</span>
-<span id="L199" class="LineNr">199 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L200" class="LineNr">200 </span>    drop_from_type<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Comment">// array allocation</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!product<span class="Delimiter">.</span>type || product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || product<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">))</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> drop_from_type<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
 <span id="L201" class="LineNr">201 </span>  <span class="Delimiter">}</span>
 <span id="L202" class="LineNr">202 </span>  reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> expected_product<span class="Delimiter">;</span>
 <span id="L203" class="LineNr">203 </span>  expected_product<span class="Delimiter">.</span>type = <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
@@ -269,8 +270,8 @@ if ('onhashchange' in window) {
 <span id="L207" class="LineNr">207 </span><span class="Normal">void</span> drop_from_type<span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">,</span> string expected_type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L208" class="LineNr">208 </span>  assert<span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name != expected_type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L210" class="LineNr">210 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't drop2 &quot;</span> &lt;&lt; expected_type &lt;&lt; <span class="Constant">&quot; from '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L211" class="LineNr">211 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't drop2 &quot;</span> &lt;&lt; expected_type &lt;&lt; <span class="Constant">&quot; from '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L212" class="LineNr">212 </span>  <span class="Delimiter">}</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Comment">// r.type = r.type-&gt;right</span>
 <span id="L214" class="LineNr">214 </span>  type_tree* tmp = r<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
@@ -336,15 +337,15 @@ if ('onhashchange' in window) {
 <span id="L274" class="LineNr">274 </span><span class="Normal">void</span> transform_new_to_allocate<span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L275" class="LineNr">275 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- convert 'new' to 'allocate' for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L276" class="LineNr">276 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L277" class="LineNr">277 </span>    instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L278" class="LineNr">278 </span>    <span class="Comment">// Convert 'new' To 'allocate'</span>
-<span id="L279" class="LineNr">279 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;new&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L280" class="LineNr">280 </span>      inst<span class="Delimiter">.</span>operation = ALLOCATE<span class="Delimiter">;</span>
-<span id="L281" class="LineNr">281 </span>      type_tree* type = <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
-<span id="L282" class="LineNr">282 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>type<span class="Delimiter">));</span>
-<span id="L283" class="LineNr">283 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;new&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;size of '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' is &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L284" class="LineNr">284 </span>      <span class="Normal">delete</span> type<span class="Delimiter">;</span>
-<span id="L285" class="LineNr">285 </span>    <span class="Delimiter">}</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Comment">// Convert 'new' To 'allocate'</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;new&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>operation = ALLOCATE<span class="Delimiter">;</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> type_tree* type = <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>type<span class="Delimiter">));</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;new&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;size of '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' is &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> type<span class="Delimiter">;</span>
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L286" class="LineNr">286 </span>  <span class="Delimiter">}</span>
 <span id="L287" class="LineNr">287 </span><span class="Delimiter">}</span>
 <span id="L288" class="LineNr">288 </span>
@@ -374,15 +375,15 @@ if ('onhashchange' in window) {
 <span id="L312" class="LineNr">312 </span>  <span class="Comment">// compute the space we need</span>
 <span id="L313" class="LineNr">313 </span>  <span class="Normal">int</span> size = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L315" class="LineNr">315 </span>    <span class="Comment">// array allocation</span>
-<span id="L316" class="LineNr">316 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;array length is &quot;</span> &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L317" class="LineNr">317 </span>    size = <span class="Comment">/*</span><span class="Comment">space for length</span><span class="Comment">*/</span><span class="Constant">1</span> + size*ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> <span class="Comment">// array allocation</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;array length is &quot;</span> &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span> size = <span class="Comment">/*</span><span class="Comment">space for length</span><span class="Comment">*/</span><span class="Constant">1</span> + size*ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L318" class="LineNr">318 </span>  <span class="Delimiter">}</span>
 <span id="L319" class="LineNr">319 </span>  <span class="Normal">int</span> result = allocate<span class="Delimiter">(</span>size<span class="Delimiter">);</span>
 <span id="L320" class="LineNr">320 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L321" class="LineNr">321 </span>    <span class="Comment">// initialize array length</span>
-<span id="L322" class="LineNr">322 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; result+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L323" class="LineNr">323 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span> <span class="Comment">// initialize array length</span>
+<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing &quot;</span> &lt;&lt; ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; result+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L324" class="LineNr">324 </span>  <span class="Delimiter">}</span>
 <span id="L325" class="LineNr">325 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L326" class="LineNr">326 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -403,8 +404,8 @@ if ('onhashchange' in window) {
 <span id="L341" class="LineNr">341 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new alloc: &quot;</span> &lt;&lt; result &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Comment">// initialize allocated space</span>
 <span id="L343" class="LineNr">343 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = result<span class="Delimiter">;</span>  <a href='043space.cc.html#L76'>address</a> &lt; result+size<span class="Delimiter">;</span>  ++address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L344" class="LineNr">344 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 0 in location &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L345" class="LineNr">345 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L344" class="LineNr">344 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 0 in location &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L346" class="LineNr">346 </span>  <span class="Delimiter">}</span>
 <span id="L347" class="LineNr">347 </span>  Current_routine<span class="Delimiter">-&gt;</span>alloc += size<span class="Delimiter">;</span>
 <span id="L348" class="LineNr">348 </span>  <span class="Comment">// no support yet for reclaiming memory between routines</span>
@@ -428,16 +429,16 @@ if ('onhashchange' in window) {
 <span id="L366" class="LineNr">366 </span><span class="Delimiter">:(code)</span>
 <span id="L367" class="LineNr">367 </span><span class="Normal">void</span> ensure_space<span class="Delimiter">(</span><span class="Normal">int</span> size<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L368" class="LineNr">368 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>size &gt; Initial_memory_per_routine<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L369" class="LineNr">369 </span>    tb_shutdown<span class="Delimiter">();</span>
-<span id="L370" class="LineNr">370 </span>    cerr &lt;&lt; <span class="Constant">&quot;can't allocate &quot;</span> &lt;&lt; size &lt;&lt; <span class="Constant">&quot; locations, that's too much compared to &quot;</span> &lt;&lt; Initial_memory_per_routine &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L371" class="LineNr">371 </span>    exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> tb_shutdown<span class="Delimiter">();</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;can't allocate &quot;</span> &lt;&lt; size &lt;&lt; <span class="Constant">&quot; locations, that's too much compared to &quot;</span> &lt;&lt; Initial_memory_per_routine &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L372" class="LineNr">372 </span>  <span class="Delimiter">}</span>
 <span id="L373" class="LineNr">373 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>alloc + size &gt; Current_routine<span class="Delimiter">-&gt;</span>alloc_max<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L374" class="LineNr">374 </span>    <span class="Comment">// waste the remaining space and create a new chunk</span>
-<span id="L375" class="LineNr">375 </span>    Current_routine<span class="Delimiter">-&gt;</span>alloc = Memory_allocated_until<span class="Delimiter">;</span>
-<span id="L376" class="LineNr">376 </span>    Memory_allocated_until += Initial_memory_per_routine<span class="Delimiter">;</span>
-<span id="L377" class="LineNr">377 </span>    Current_routine<span class="Delimiter">-&gt;</span>alloc_max = Memory_allocated_until<span class="Delimiter">;</span>
-<span id="L378" class="LineNr">378 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;new&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;routine allocated memory from &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>alloc &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>alloc_max &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span> <span class="Comment">// waste the remaining space and create a new chunk</span>
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>alloc = Memory_allocated_until<span class="Delimiter">;</span>
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> Memory_allocated_until += Initial_memory_per_routine<span class="Delimiter">;</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>alloc_max = Memory_allocated_until<span class="Delimiter">;</span>
+<span id="L378" class="LineNr">378 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;new&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;routine allocated memory from &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>alloc &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>alloc_max &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L379" class="LineNr">379 </span>  <span class="Delimiter">}</span>
 <span id="L380" class="LineNr">380 </span><span class="Delimiter">}</span>
 <span id="L381" class="LineNr">381 </span>
diff --git a/html/035lookup.cc.html b/html/035lookup.cc.html
index 42ea2b90..7ba368f8 100644
--- a/html/035lookup.cc.html
+++ b/html/035lookup.cc.html
@@ -16,17 +16,18 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.traceAbsent { color: #c00000; }
-.Special { color: #c00000; }
-.SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.SalientComment { color: #00ffff; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.traceAbsent { color: #c00000; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -144,18 +145,18 @@ if ('onhashchange' in window) {
 <span id="L81" class="LineNr"> 81 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Comment">// End canonize(x) Special-cases</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">))</span>
-<span id="L84" class="LineNr"> 84 </span>    lookup_memory<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> lookup_memory<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L85" class="LineNr"> 85 </span><span class="Delimiter">}</span>
 <span id="L86" class="LineNr"> 86 </span>
 <span id="L87" class="LineNr"> 87 </span><span class="Normal">void</span> lookup_memory<span class="Delimiter">(</span>reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type || x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to /lookup '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' but it isn't an address</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L90" class="LineNr"> 90 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to /lookup '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' but it isn't an address</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Delimiter">}</span>
 <span id="L92" class="LineNr"> 92 </span>  <span class="Comment">// compute value</span>
 <span id="L93" class="LineNr"> 93 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L94" class="LineNr"> 94 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to /lookup 0</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L95" class="LineNr"> 95 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to /lookup 0</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L96" class="LineNr"> 96 </span>  <span class="Delimiter">}</span>
 <span id="L97" class="LineNr"> 97 </span>  lookup_memory_core<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">check_for_null</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
 <span id="L98" class="LineNr"> 98 </span><span class="Delimiter">}</span>
@@ -166,14 +167,14 @@ if ('onhashchange' in window) {
 <span id="L103" class="LineNr">103 </span>  x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> x<span class="Delimiter">.</span>value<span class="Delimiter">));</span>
 <span id="L104" class="LineNr">104 </span>  drop_from_type<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L106" class="LineNr">106 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;skipping refcount at &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L107" class="LineNr">107 </span>    x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// skip refcount</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;skipping refcount at &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// skip refcount</span>
 <span id="L108" class="LineNr">108 </span>  <span class="Delimiter">}</span>
 <span id="L109" class="LineNr">109 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>check_for_null<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L110" class="LineNr">110 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">)</span>
-<span id="L111" class="LineNr">111 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;tried to /lookup 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L112" class="LineNr">112 </span>    <span class="Normal">else</span>
-<span id="L113" class="LineNr">113 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;tried to /lookup 0</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">)</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;tried to /lookup 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;tried to /lookup 0</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Delimiter">}</span>
 <span id="L115" class="LineNr">115 </span>  drop_one_lookup<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L116" class="LineNr">116 </span><span class="Delimiter">}</span>
@@ -236,22 +237,22 @@ if ('onhashchange' in window) {
 <span id="L173" class="LineNr">173 </span><span class="Delimiter">:(code)</span>
 <span id="L174" class="LineNr">174 </span><span class="Normal">bool</span> canonize_type<span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L176" class="LineNr">176 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || !r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left || !r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L177" class="LineNr">177 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't lookup non-address: '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L178" class="LineNr">178 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L179" class="LineNr">179 </span>    <span class="Delimiter">}</span>
-<span id="L180" class="LineNr">180 </span>    drop_from_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
-<span id="L181" class="LineNr">181 </span>    drop_one_lookup<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || !r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left || !r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value != get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't lookup non-address: '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;': '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> drop_from_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> drop_one_lookup<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Delimiter">}</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L184" class="LineNr">184 </span><span class="Delimiter">}</span>
 <span id="L185" class="LineNr">185 </span>
 <span id="L186" class="LineNr">186 </span><span class="Normal">void</span> drop_one_lookup<span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L187" class="LineNr">187 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;pair&lt;string<span class="Delimiter">,</span> string_tree*&gt; &gt;::iterator p = r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L188" class="LineNr">188 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first == <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L189" class="LineNr">189 </span>      r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>p<span class="Delimiter">);</span>
-<span id="L190" class="LineNr">190 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L191" class="LineNr">191 </span>    <span class="Delimiter">}</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first == <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>p<span class="Delimiter">);</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L192" class="LineNr">192 </span>  <span class="Delimiter">}</span>
 <span id="L193" class="LineNr">193 </span>  assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
 <span id="L194" class="LineNr">194 </span><span class="Delimiter">}</span>
@@ -559,11 +560,11 @@ if ('onhashchange' in window) {
 <span id="L496" class="LineNr">496 </span><span class="Delimiter">:(before &quot;End Parsing reagent&quot;)</span>
 <span id="L497" class="LineNr">497 </span><span class="Delimiter">{</span>
 <span id="L498" class="LineNr">498 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;*&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L499" class="LineNr">499 </span>    name<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L500" class="LineNr">500 </span>    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> name<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
 <span id="L501" class="LineNr">501 </span>  <span class="Delimiter">}</span>
 <span id="L502" class="LineNr">502 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L503" class="LineNr">503 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;illegal name '&quot;</span> &lt;&lt; original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;illegal name '&quot;</span> &lt;&lt; original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L504" class="LineNr">504 </span><span class="Delimiter">}</span>
 <span id="L505" class="LineNr">505 </span>
 <span id="L506" class="LineNr">506 </span><span class="SalientComment">//:: helpers for debugging</span>
@@ -591,13 +592,13 @@ if ('onhashchange' in window) {
 <span id="L528" class="LineNr">528 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L529" class="LineNr">529 </span><span class="Normal">case</span> _BAR: <span class="Delimiter">{</span>
 <span id="L530" class="LineNr">530 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L531" class="LineNr">531 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Bar != -<span class="Constant">1</span><span class="Delimiter">)</span> cerr &lt;&lt; Bar &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> Bar<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L532" class="LineNr">532 </span>    <span class="Normal">else</span> cerr &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L531" class="LineNr">531 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Bar != -<span class="Constant">1</span><span class="Delimiter">)</span> cerr &lt;&lt; Bar &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> Bar<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L532" class="LineNr">532 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> cerr &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L533" class="LineNr">533 </span>  <span class="Delimiter">}</span>
 <span id="L534" class="LineNr">534 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L535" class="LineNr">535 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L536" class="LineNr">536 </span>    canonize<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
-<span id="L537" class="LineNr">537 </span>    Bar = tmp<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L536" class="LineNr">536 </span>  <span class="Conceal">¦</span> canonize<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
+<span id="L537" class="LineNr">537 </span>  <span class="Conceal">¦</span> Bar = tmp<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L538" class="LineNr">538 </span>  <span class="Delimiter">}</span>
 <span id="L539" class="LineNr">539 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L540" class="LineNr">540 </span><span class="Delimiter">}</span>
diff --git a/html/036refcount.cc.html b/html/036refcount.cc.html
index 41c7a557..7b01af8a 100644
--- a/html/036refcount.cc.html
+++ b/html/036refcount.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.Special { color: #c00000; }
+.SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
-.SalientComment { color: #00ffff; }
 -->
 </style>
 
@@ -96,9 +97,9 @@ if ('onhashchange' in window) {
 <span id="L33" class="LineNr">  33 </span>
 <span id="L34" class="LineNr">  34 </span><span class="Normal">void</span> <a href='036refcount.cc.html#L34'>increment_any_refcounts</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; canonized_x<span class="Delimiter">,</span> <span class="Normal">const</span> vector&lt;<span class="Normal">double</span>&gt;&amp; data<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L35" class="LineNr">  35 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L36" class="LineNr">  36 </span>    assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>data<span class="Delimiter">));</span>
-<span id="L37" class="LineNr">  37 </span>    assert<span class="Delimiter">(</span>!canonized_x<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">);</span>
-<span id="L38" class="LineNr">  38 </span>    <a href='036refcount.cc.html#L43'>increment_refcount</a><span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L36" class="LineNr">  36 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>data<span class="Delimiter">));</span>
+<span id="L37" class="LineNr">  37 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!canonized_x<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">);</span>
+<span id="L38" class="LineNr">  38 </span>  <span class="Conceal">¦</span> <a href='036refcount.cc.html#L43'>increment_refcount</a><span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L39" class="LineNr">  39 </span>  <span class="Delimiter">}</span>
 <span id="L40" class="LineNr">  40 </span>  <span class="Comment">// End Increment Refcounts(canonized_x)</span>
 <span id="L41" class="LineNr">  41 </span><span class="Delimiter">}</span>
@@ -113,9 +114,9 @@ if ('onhashchange' in window) {
 <span id="L50" class="LineNr">  50 </span>
 <span id="L51" class="LineNr">  51 </span><span class="Normal">void</span> <a href='036refcount.cc.html#L51'>decrement_any_refcounts</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; canonized_x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L52" class="LineNr">  52 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L53" class="LineNr">  53 </span>    assert<span class="Delimiter">(</span>canonized_x<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
-<span id="L54" class="LineNr">  54 </span>    assert<span class="Delimiter">(</span>!canonized_x<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">);</span>
-<span id="L55" class="LineNr">  55 </span>    <a href='036refcount.cc.html#L60'>decrement_refcount</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>value<span class="Delimiter">),</span> <a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">(</span>canonized_x<span class="Delimiter">.</span>type<span class="Delimiter">),</span> <a href='036refcount.cc.html#L82'>payload_size</a><span class="Delimiter">(</span>canonized_x<span class="Delimiter">));</span>
+<span id="L53" class="LineNr">  53 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>canonized_x<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
+<span id="L54" class="LineNr">  54 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!canonized_x<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">);</span>
+<span id="L55" class="LineNr">  55 </span>  <span class="Conceal">¦</span> <a href='036refcount.cc.html#L60'>decrement_refcount</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>value<span class="Delimiter">),</span> <a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">(</span>canonized_x<span class="Delimiter">.</span>type<span class="Delimiter">),</span> <a href='036refcount.cc.html#L82'>payload_size</a><span class="Delimiter">(</span>canonized_x<span class="Delimiter">));</span>
 <span id="L56" class="LineNr">  56 </span>  <span class="Delimiter">}</span>
 <span id="L57" class="LineNr">  57 </span>  <span class="Comment">// End Decrement Refcounts(canonized_x)</span>
 <span id="L58" class="LineNr">  58 </span><span class="Delimiter">}</span>
@@ -123,22 +124,22 @@ if ('onhashchange' in window) {
 <span id="L60" class="LineNr">  60 </span><span class="Normal">void</span> <a href='036refcount.cc.html#L60'>decrement_refcount</a><span class="Delimiter">(</span><span class="Normal">int</span> old_address<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* <a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">,</span> <span class="Normal">int</span> <a href='036refcount.cc.html#L82'>payload_size</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L61" class="LineNr">  61 </span>  assert<span class="Delimiter">(</span>old_address &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L62" class="LineNr">  62 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>old_address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L63" class="LineNr">  63 </span>    <span class="Normal">int</span> old_refcount = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> old_address<span class="Delimiter">);</span>
-<span id="L64" class="LineNr">  64 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;decrementing refcount of &quot;</span> &lt;&lt; old_address &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; old_refcount &lt;&lt; <span class="Constant">&quot; -&gt; &quot;</span> &lt;&lt; old_refcount-<span class="Constant">1</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L65" class="LineNr">  65 </span>    --old_refcount<span class="Delimiter">;</span>
-<span id="L66" class="LineNr">  66 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> old_address<span class="Delimiter">,</span> old_refcount<span class="Delimiter">);</span>
-<span id="L67" class="LineNr">  67 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>old_refcount &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L68" class="LineNr">  68 </span>      tb_shutdown<span class="Delimiter">();</span>
-<span id="L69" class="LineNr">  69 </span>      cerr &lt;&lt; <span class="Constant">&quot;Negative refcount!!! &quot;</span> &lt;&lt; old_address &lt;&lt; <span class="Constant">' '</span> &lt;&lt; old_refcount &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L70" class="LineNr">  70 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr">  71 </span>        cerr &lt;&lt; <span class="Constant">&quot;Saving <a href='003trace.cc.html#L161'>trace</a> to last_trace.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L72" class="LineNr">  72 </span>        ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
-<span id="L73" class="LineNr">  73 </span>        fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
-<span id="L74" class="LineNr">  74 </span>        fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
-<span id="L75" class="LineNr">  75 </span>      <span class="Delimiter">}</span>
-<span id="L76" class="LineNr">  76 </span>      exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L77" class="LineNr">  77 </span>    <span class="Delimiter">}</span>
-<span id="L78" class="LineNr">  78 </span>    <span class="Comment">// End Decrement Refcount(old_address, payload_type, payload_size)</span>
+<span id="L63" class="LineNr">  63 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> old_refcount = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> old_address<span class="Delimiter">);</span>
+<span id="L64" class="LineNr">  64 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;decrementing refcount of &quot;</span> &lt;&lt; old_address &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; old_refcount &lt;&lt; <span class="Constant">&quot; -&gt; &quot;</span> &lt;&lt; old_refcount-<span class="Constant">1</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L65" class="LineNr">  65 </span>  <span class="Conceal">¦</span> --old_refcount<span class="Delimiter">;</span>
+<span id="L66" class="LineNr">  66 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> old_address<span class="Delimiter">,</span> old_refcount<span class="Delimiter">);</span>
+<span id="L67" class="LineNr">  67 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>old_refcount &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L68" class="LineNr">  68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_shutdown<span class="Delimiter">();</span>
+<span id="L69" class="LineNr">  69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;Negative refcount!!! &quot;</span> &lt;&lt; old_address &lt;&lt; <span class="Constant">' '</span> &lt;&lt; old_refcount &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L70" class="LineNr">  70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L71" class="LineNr">  71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;Saving <a href='003trace.cc.html#L161'>trace</a> to last_trace.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L72" class="LineNr">  72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
+<span id="L73" class="LineNr">  73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L74" class="LineNr">  74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
+<span id="L75" class="LineNr">  75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L76" class="LineNr">  76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L77" class="LineNr">  77 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L78" class="LineNr">  78 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Decrement Refcount(old_address, payload_type, payload_size)</span>
 <span id="L79" class="LineNr">  79 </span>  <span class="Delimiter">}</span>
 <span id="L80" class="LineNr">  80 </span><span class="Delimiter">}</span>
 <span id="L81" class="LineNr">  81 </span>
@@ -294,8 +295,8 @@ if ('onhashchange' in window) {
 <span id="L231" class="LineNr"> 231 </span><span class="Delimiter">}</span>
 <span id="L232" class="LineNr"> 232 </span>address_element_info::<a href='036refcount.cc.html#L232'>~address_element_info</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L233" class="LineNr"> 233 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L234" class="LineNr"> 234 </span>    <span class="Normal">delete</span> <a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">;</span>
-<span id="L235" class="LineNr"> 235 </span>    <a href='030container.cc.html#L238'>payload_type</a> = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L234" class="LineNr"> 234 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> <a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">;</span>
+<span id="L235" class="LineNr"> 235 </span>  <span class="Conceal">¦</span> <a href='030container.cc.html#L238'>payload_type</a> = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L236" class="LineNr"> 236 </span>  <span class="Delimiter">}</span>
 <span id="L237" class="LineNr"> 237 </span><span class="Delimiter">}</span>
 <span id="L238" class="LineNr"> 238 </span>address_element_info&amp; address_element_info::<span class="Normal">operator</span>=<span class="Delimiter">(</span><span class="Normal">const</span> address_element_info&amp; other<span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -326,8 +327,8 @@ if ('onhashchange' in window) {
 <span id="L263" class="LineNr"> 263 </span><span class="Normal">bool</span> <span class="Normal">operator</span>&lt;<span class="Delimiter">(</span><span class="Normal">const</span> set&lt;tag_condition_info&gt;&amp; a<span class="Delimiter">,</span> <span class="Normal">const</span> set&lt;tag_condition_info&gt;&amp; b<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L264" class="LineNr"> 264 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">.</span>size<span class="Delimiter">()</span> != b<span class="Delimiter">.</span>size<span class="Delimiter">())</span> <span class="Identifier">return</span> a<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &lt; b<span class="Delimiter">.</span>size<span class="Delimiter">();</span>
 <span id="L265" class="LineNr"> 265 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;tag_condition_info&gt;::const_iterator pa = a<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> pb = b<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  pa != a<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++pa<span class="Delimiter">,</span> ++pb<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L266" class="LineNr"> 266 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>pa<span class="Delimiter">-&gt;</span>offset != pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> <span class="Identifier">return</span> pa<span class="Delimiter">-&gt;</span>offset &lt; pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">;</span>
-<span id="L267" class="LineNr"> 267 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>pa<span class="Delimiter">-&gt;</span>tag != pb<span class="Delimiter">-&gt;</span>tag<span class="Delimiter">)</span> <span class="Identifier">return</span> pa<span class="Delimiter">-&gt;</span>tag &lt; pb<span class="Delimiter">-&gt;</span>tag<span class="Delimiter">;</span>
+<span id="L266" class="LineNr"> 266 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>pa<span class="Delimiter">-&gt;</span>offset != pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> <span class="Identifier">return</span> pa<span class="Delimiter">-&gt;</span>offset &lt; pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">;</span>
+<span id="L267" class="LineNr"> 267 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>pa<span class="Delimiter">-&gt;</span>tag != pb<span class="Delimiter">-&gt;</span>tag<span class="Delimiter">)</span> <span class="Identifier">return</span> pa<span class="Delimiter">-&gt;</span>tag &lt; pb<span class="Delimiter">-&gt;</span>tag<span class="Delimiter">;</span>
 <span id="L268" class="LineNr"> 268 </span>  <span class="Delimiter">}</span>
 <span id="L269" class="LineNr"> 269 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// equal</span>
 <span id="L270" class="LineNr"> 270 </span><span class="Delimiter">}</span>
@@ -339,7 +340,7 @@ if ('onhashchange' in window) {
 <span id="L276" class="LineNr"> 276 </span><span class="Normal">bool</span> <span class="Normal">operator</span>&lt;<span class="Delimiter">(</span><span class="Normal">const</span> set&lt;address_element_info&gt;&amp; a<span class="Delimiter">,</span> <span class="Normal">const</span> set&lt;address_element_info&gt;&amp; b<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L277" class="LineNr"> 277 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">.</span>size<span class="Delimiter">()</span> != b<span class="Delimiter">.</span>size<span class="Delimiter">())</span> <span class="Identifier">return</span> a<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &lt; b<span class="Delimiter">.</span>size<span class="Delimiter">();</span>
 <span id="L278" class="LineNr"> 278 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator pa = a<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> pb = b<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  pa != a<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++pa<span class="Delimiter">,</span> ++pb<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L279" class="LineNr"> 279 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>pa<span class="Delimiter">-&gt;</span>offset != pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> <span class="Identifier">return</span> pa<span class="Delimiter">-&gt;</span>offset &lt; pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">;</span>
+<span id="L279" class="LineNr"> 279 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>pa<span class="Delimiter">-&gt;</span>offset != pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> <span class="Identifier">return</span> pa<span class="Delimiter">-&gt;</span>offset &lt; pb<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">;</span>
 <span id="L280" class="LineNr"> 280 </span>  <span class="Delimiter">}</span>
 <span id="L281" class="LineNr"> 281 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// equal</span>
 <span id="L282" class="LineNr"> 282 </span><span class="Delimiter">}</span>
@@ -358,12 +359,12 @@ if ('onhashchange' in window) {
 <span id="L295" class="LineNr"> 295 </span>  recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L296" class="LineNr"> 296 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- compute <a href='043space.cc.html#L76'>address</a> offsets for &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L297" class="LineNr"> 297 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L298" class="LineNr"> 298 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L299" class="LineNr"> 299 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;- compute <a href='043space.cc.html#L76'>address</a> offsets for &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L300" class="LineNr"> 300 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L301" class="LineNr"> 301 </span>      compute_container_address_offsets<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
-<span id="L302" class="LineNr"> 302 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L303" class="LineNr"> 303 </span>      compute_container_address_offsets<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+<span id="L298" class="LineNr"> 298 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L299" class="LineNr"> 299 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;- compute <a href='043space.cc.html#L76'>address</a> offsets for &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L300" class="LineNr"> 300 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L301" class="LineNr"> 301 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_address_offsets<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+<span id="L302" class="LineNr"> 302 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L303" class="LineNr"> 303 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_address_offsets<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot; in '&quot;</span>+to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
 <span id="L304" class="LineNr"> 304 </span>  <span class="Delimiter">}</span>
 <span id="L305" class="LineNr"> 305 </span><span class="Delimiter">}</span>
 <span id="L306" class="LineNr"> 306 </span>
@@ -371,7 +372,7 @@ if ('onhashchange' in window) {
 <span id="L308" class="LineNr"> 308 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">)</span> || is_dummy<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L309" class="LineNr"> 309 </span>  compute_container_address_offsets<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L310" class="LineNr"> 310 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> r<span class="Delimiter">.</span>type<span class="Delimiter">))</span>
-<span id="L311" class="LineNr"> 311 </span>    r<span class="Delimiter">.</span>metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L311" class="LineNr"> 311 </span>  <span class="Conceal">¦</span> r<span class="Delimiter">.</span>metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L312" class="LineNr"> 312 </span><span class="Delimiter">}</span>
 <span id="L313" class="LineNr"> 313 </span>
 <span id="L314" class="LineNr"> 314 </span><span class="Comment">// the recursive structure of this function needs to exactly match</span>
@@ -379,25 +380,25 @@ if ('onhashchange' in window) {
 <span id="L316" class="LineNr"> 316 </span><span class="Normal">void</span> compute_container_address_offsets<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; location_for_error_messages<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L317" class="LineNr"> 317 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L318" class="LineNr"> 318 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L319" class="LineNr"> 319 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L320" class="LineNr"> 320 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L321" class="LineNr"> 321 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L322" class="LineNr"> 322 </span>    <span class="Delimiter">}</span>
-<span id="L323" class="LineNr"> 323 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;address&quot;</span><span class="Delimiter">)</span>
-<span id="L324" class="LineNr"> 324 </span>      compute_container_address_offsets<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">(</span>type<span class="Delimiter">),</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L325" class="LineNr"> 325 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;array&quot;</span><span class="Delimiter">)</span>
-<span id="L326" class="LineNr"> 326 </span>      compute_container_address_offsets<span class="Delimiter">(</span><a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>type<span class="Delimiter">),</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L327" class="LineNr"> 327 </span>    <span class="Comment">// End compute_container_address_offsets Non-atom Special-cases</span>
+<span id="L319" class="LineNr"> 319 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L320" class="LineNr"> 320 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L321" class="LineNr"> 321 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L322" class="LineNr"> 322 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L323" class="LineNr"> 323 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;address&quot;</span><span class="Delimiter">)</span>
+<span id="L324" class="LineNr"> 324 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_address_offsets<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">(</span>type<span class="Delimiter">),</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L325" class="LineNr"> 325 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;array&quot;</span><span class="Delimiter">)</span>
+<span id="L326" class="LineNr"> 326 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> compute_container_address_offsets<span class="Delimiter">(</span><a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>type<span class="Delimiter">),</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L327" class="LineNr"> 327 </span>  <span class="Conceal">¦</span> <span class="Comment">// End compute_container_address_offsets Non-atom Special-cases</span>
 <span id="L328" class="LineNr"> 328 </span>  <span class="Delimiter">}</span>
 <span id="L329" class="LineNr"> 329 </span>  <span class="Normal">const</span> type_tree* base_type = type<span class="Delimiter">;</span>
 <span id="L330" class="LineNr"> 330 </span>  <span class="Comment">// Update base_type in compute_container_address_offsets</span>
 <span id="L331" class="LineNr"> 331 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// error raised elsewhere</span>
 <span id="L332" class="LineNr"> 332 </span>  type_info&amp; info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
 <span id="L333" class="LineNr"> 333 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L334" class="LineNr"> 334 </span>    compute_container_address_offsets<span class="Delimiter">(</span>info<span class="Delimiter">,</span> type<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L334" class="LineNr"> 334 </span>  <span class="Conceal">¦</span> compute_container_address_offsets<span class="Delimiter">(</span>info<span class="Delimiter">,</span> type<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L335" class="LineNr"> 335 </span>  <span class="Delimiter">}</span>
 <span id="L336" class="LineNr"> 336 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L174'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L337" class="LineNr"> 337 </span>    <a href='036refcount.cc.html#L348'>compute_exclusive_container_address_offsets</a><span class="Delimiter">(</span>info<span class="Delimiter">,</span> type<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L337" class="LineNr"> 337 </span>  <span class="Conceal">¦</span> <a href='036refcount.cc.html#L348'>compute_exclusive_container_address_offsets</a><span class="Delimiter">(</span>info<span class="Delimiter">,</span> type<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L338" class="LineNr"> 338 </span>  <span class="Delimiter">}</span>
 <span id="L339" class="LineNr"> 339 </span><span class="Delimiter">}</span>
 <span id="L340" class="LineNr"> 340 </span>
@@ -412,68 +413,68 @@ if ('onhashchange' in window) {
 <span id="L349" class="LineNr"> 349 </span>  container_metadata&amp; metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> full_type<span class="Delimiter">);</span>
 <span id="L350" class="LineNr"> 350 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9994</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;compute <a href='043space.cc.html#L76'>address</a> offsets for exclusive container &quot;</span> &lt;&lt; exclusive_container_info<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L351" class="LineNr"> 351 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> tag = <span class="Constant">0</span><span class="Delimiter">;</span>  tag &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>exclusive_container_info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L352" class="LineNr"> 352 </span>    set&lt;tag_condition_info&gt; key<span class="Delimiter">;</span>
-<span id="L353" class="LineNr"> 353 </span>    key<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>tag_condition_info<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">tag is at offset</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">,</span> tag<span class="Delimiter">));</span>
-<span id="L354" class="LineNr"> 354 </span>    <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip tag offset</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> variant_type<span class="Delimiter">(</span>full_type<span class="Delimiter">,</span> tag<span class="Delimiter">).</span>type<span class="Delimiter">,</span> metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L352" class="LineNr"> 352 </span>  <span class="Conceal">¦</span> set&lt;tag_condition_info&gt; key<span class="Delimiter">;</span>
+<span id="L353" class="LineNr"> 353 </span>  <span class="Conceal">¦</span> key<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>tag_condition_info<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">tag is at offset</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">,</span> tag<span class="Delimiter">));</span>
+<span id="L354" class="LineNr"> 354 </span>  <span class="Conceal">¦</span> <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">skip tag offset</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> variant_type<span class="Delimiter">(</span>full_type<span class="Delimiter">,</span> tag<span class="Delimiter">).</span>type<span class="Delimiter">,</span> metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L355" class="LineNr"> 355 </span>  <span class="Delimiter">}</span>
 <span id="L356" class="LineNr"> 356 </span><span class="Delimiter">}</span>
 <span id="L357" class="LineNr"> 357 </span>
 <span id="L358" class="LineNr"> 358 </span><span class="Normal">void</span> <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span><span class="Normal">int</span> base_offset<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> map&lt;set&lt;tag_condition_info&gt;<span class="Delimiter">,</span> set&lt;address_element_info&gt; &gt;&amp; out<span class="Delimiter">,</span> <span class="Normal">const</span> set&lt;tag_condition_info&gt;&amp; key<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; location_for_error_messages<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L359" class="LineNr"> 359 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L360" class="LineNr"> 360 </span>    <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> key<span class="Delimiter">).</span>insert<span class="Delimiter">(</span>address_element_info<span class="Delimiter">(</span>base_offset<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*payload_type<span class="Delimiter">(</span>type<span class="Delimiter">))));</span>
-<span id="L361" class="LineNr"> 361 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L360" class="LineNr"> 360 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> key<span class="Delimiter">).</span>insert<span class="Delimiter">(</span>address_element_info<span class="Delimiter">(</span>base_offset<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*payload_type<span class="Delimiter">(</span>type<span class="Delimiter">))));</span>
+<span id="L361" class="LineNr"> 361 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L362" class="LineNr"> 362 </span>  <span class="Delimiter">}</span>
 <span id="L363" class="LineNr"> 363 </span>  <span class="Normal">const</span> type_tree* base_type = type<span class="Delimiter">;</span>
 <span id="L364" class="LineNr"> 364 </span>  <span class="Comment">// Update base_type in append_container_address_offsets</span>
 <span id="L365" class="LineNr"> 365 </span>  <span class="Normal">const</span> type_info&amp; info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
 <span id="L366" class="LineNr"> 366 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L367" class="LineNr"> 367 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr_index = <span class="Constant">0</span><span class="Delimiter">,</span> curr_offset = base_offset<span class="Delimiter">;</span>  curr_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++curr_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L368" class="LineNr"> 368 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking container &quot;</span> &lt;&lt; base_type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;, element &quot;</span> &lt;&lt; curr_index &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L369" class="LineNr"> 369 </span>      reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>type<span class="Delimiter">,</span> curr_index<span class="Delimiter">);</span>  <span class="Comment">// not base_type</span>
-<span id="L370" class="LineNr"> 370 </span>      <span class="Comment">// Compute Container Address Offset(element)</span>
-<span id="L371" class="LineNr"> 371 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L372" class="LineNr"> 372 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address at offset &quot;</span> &lt;&lt; curr_offset &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L373" class="LineNr"> 373 </span>        <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> key<span class="Delimiter">).</span>insert<span class="Delimiter">(</span>address_element_info<span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*payload_type<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">))));</span>
-<span id="L374" class="LineNr"> 374 </span>        ++curr_offset<span class="Delimiter">;</span>
-<span id="L375" class="LineNr"> 375 </span>      <span class="Delimiter">}</span>
-<span id="L376" class="LineNr"> 376 </span>      <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L377" class="LineNr"> 377 </span>        curr_offset += <span class="Comment">/*</span><span class="Comment">array length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L378" class="LineNr"> 378 </span>        <span class="Normal">const</span> type_tree* array_element_type = <a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L379" class="LineNr"> 379 </span>        <span class="Normal">int</span> array_element_size = size_of<span class="Delimiter">(</span>array_element_type<span class="Delimiter">);</span>
-<span id="L380" class="LineNr"> 380 </span>        <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='032array.cc.html#L117'>static_array_length</a><span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L381" class="LineNr"> 381 </span>          <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> array_element_type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L382" class="LineNr"> 382 </span>          curr_offset += array_element_size<span class="Delimiter">;</span>
-<span id="L383" class="LineNr"> 383 </span>        <span class="Delimiter">}</span>
-<span id="L384" class="LineNr"> 384 </span>      <span class="Delimiter">}</span>
-<span id="L385" class="LineNr"> 385 </span>      <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_container<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L386" class="LineNr"> 386 </span>        <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L387" class="LineNr"> 387 </span>        curr_offset += size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
-<span id="L388" class="LineNr"> 388 </span>      <span class="Delimiter">}</span>
-<span id="L389" class="LineNr"> 389 </span>      <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_exclusive_container<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L390" class="LineNr"> 390 </span>        <span class="Normal">const</span> type_tree* element_base_type = element<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
-<span id="L391" class="LineNr"> 391 </span>        <span class="Comment">// Update element_base_type For Exclusive Container in append_addresses</span>
-<span id="L392" class="LineNr"> 392 </span>        <span class="Normal">const</span> type_info&amp; element_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> element_base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
-<span id="L393" class="LineNr"> 393 </span>        <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> tag = <span class="Constant">0</span><span class="Delimiter">;</span>  tag &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>element_info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L394" class="LineNr"> 394 </span>          set&lt;tag_condition_info&gt; new_key = key<span class="Delimiter">;</span>
-<span id="L395" class="LineNr"> 395 </span>          new_key<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>tag_condition_info<span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> tag<span class="Delimiter">));</span>
-<span id="L396" class="LineNr"> 396 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>out<span class="Delimiter">,</span> new_key<span class="Delimiter">))</span>
-<span id="L397" class="LineNr"> 397 </span>            <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>curr_offset+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> variant_type<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> tag<span class="Delimiter">).</span>type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> new_key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L398" class="LineNr"> 398 </span>        <span class="Delimiter">}</span>
-<span id="L399" class="LineNr"> 399 </span>        curr_offset += size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
-<span id="L400" class="LineNr"> 400 </span>      <span class="Delimiter">}</span>
-<span id="L401" class="LineNr"> 401 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L402" class="LineNr"> 402 </span>        <span class="Comment">// non-address primitive</span>
-<span id="L403" class="LineNr"> 403 </span>        ++curr_offset<span class="Delimiter">;</span>
-<span id="L404" class="LineNr"> 404 </span>      <span class="Delimiter">}</span>
-<span id="L405" class="LineNr"> 405 </span>    <span class="Delimiter">}</span>
+<span id="L367" class="LineNr"> 367 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr_index = <span class="Constant">0</span><span class="Delimiter">,</span> curr_offset = base_offset<span class="Delimiter">;</span>  curr_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++curr_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L368" class="LineNr"> 368 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking container &quot;</span> &lt;&lt; base_type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;, element &quot;</span> &lt;&lt; curr_index &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L369" class="LineNr"> 369 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>type<span class="Delimiter">,</span> curr_index<span class="Delimiter">);</span>  <span class="Comment">// not base_type</span>
+<span id="L370" class="LineNr"> 370 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Compute Container Address Offset(element)</span>
+<span id="L371" class="LineNr"> 371 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L372" class="LineNr"> 372 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address at offset &quot;</span> &lt;&lt; curr_offset &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L373" class="LineNr"> 373 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> key<span class="Delimiter">).</span>insert<span class="Delimiter">(</span>address_element_info<span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*payload_type<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">))));</span>
+<span id="L374" class="LineNr"> 374 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++curr_offset<span class="Delimiter">;</span>
+<span id="L375" class="LineNr"> 375 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L376" class="LineNr"> 376 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L377" class="LineNr"> 377 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_offset += <span class="Comment">/*</span><span class="Comment">array length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L378" class="LineNr"> 378 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> type_tree* array_element_type = <a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L379" class="LineNr"> 379 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> array_element_size = size_of<span class="Delimiter">(</span>array_element_type<span class="Delimiter">);</span>
+<span id="L380" class="LineNr"> 380 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='032array.cc.html#L117'>static_array_length</a><span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L381" class="LineNr"> 381 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> array_element_type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L382" class="LineNr"> 382 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_offset += array_element_size<span class="Delimiter">;</span>
+<span id="L383" class="LineNr"> 383 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L384" class="LineNr"> 384 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L385" class="LineNr"> 385 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_container<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L386" class="LineNr"> 386 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L387" class="LineNr"> 387 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_offset += size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
+<span id="L388" class="LineNr"> 388 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L389" class="LineNr"> 389 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_exclusive_container<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L390" class="LineNr"> 390 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> type_tree* element_base_type = element<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
+<span id="L391" class="LineNr"> 391 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Update element_base_type For Exclusive Container in append_addresses</span>
+<span id="L392" class="LineNr"> 392 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> type_info&amp; element_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> element_base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+<span id="L393" class="LineNr"> 393 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> tag = <span class="Constant">0</span><span class="Delimiter">;</span>  tag &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>element_info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L394" class="LineNr"> 394 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> set&lt;tag_condition_info&gt; new_key = key<span class="Delimiter">;</span>
+<span id="L395" class="LineNr"> 395 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> new_key<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>tag_condition_info<span class="Delimiter">(</span>curr_offset<span class="Delimiter">,</span> tag<span class="Delimiter">));</span>
+<span id="L396" class="LineNr"> 396 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>out<span class="Delimiter">,</span> new_key<span class="Delimiter">))</span>
+<span id="L397" class="LineNr"> 397 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>curr_offset+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> variant_type<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> tag<span class="Delimiter">).</span>type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> new_key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L398" class="LineNr"> 398 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L399" class="LineNr"> 399 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_offset += size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
+<span id="L400" class="LineNr"> 400 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L401" class="LineNr"> 401 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L402" class="LineNr"> 402 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// non-address primitive</span>
+<span id="L403" class="LineNr"> 403 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++curr_offset<span class="Delimiter">;</span>
+<span id="L404" class="LineNr"> 404 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L405" class="LineNr"> 405 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L406" class="LineNr"> 406 </span>  <span class="Delimiter">}</span>
 <span id="L407" class="LineNr"> 407 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == <a href='010vm.cc.html#L174'>EXCLUSIVE_CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L408" class="LineNr"> 408 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> tag = <span class="Constant">0</span><span class="Delimiter">;</span>  tag &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L409" class="LineNr"> 409 </span>      set&lt;tag_condition_info&gt; new_key = key<span class="Delimiter">;</span>
-<span id="L410" class="LineNr"> 410 </span>      new_key<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>tag_condition_info<span class="Delimiter">(</span>base_offset<span class="Delimiter">,</span> tag<span class="Delimiter">));</span>
-<span id="L411" class="LineNr"> 411 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>out<span class="Delimiter">,</span> new_key<span class="Delimiter">))</span>
-<span id="L412" class="LineNr"> 412 </span>        <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>base_offset+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> variant_type<span class="Delimiter">(</span>type<span class="Delimiter">,</span> tag<span class="Delimiter">).</span>type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> new_key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L413" class="LineNr"> 413 </span>    <span class="Delimiter">}</span>
+<span id="L408" class="LineNr"> 408 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> tag = <span class="Constant">0</span><span class="Delimiter">;</span>  tag &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++tag<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L409" class="LineNr"> 409 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> set&lt;tag_condition_info&gt; new_key = key<span class="Delimiter">;</span>
+<span id="L410" class="LineNr"> 410 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> new_key<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>tag_condition_info<span class="Delimiter">(</span>base_offset<span class="Delimiter">,</span> tag<span class="Delimiter">));</span>
+<span id="L411" class="LineNr"> 411 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>out<span class="Delimiter">,</span> new_key<span class="Delimiter">))</span>
+<span id="L412" class="LineNr"> 412 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L358'>append_addresses</a><span class="Delimiter">(</span>base_offset+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> variant_type<span class="Delimiter">(</span>type<span class="Delimiter">,</span> tag<span class="Delimiter">).</span>type<span class="Delimiter">,</span> out<span class="Delimiter">,</span> new_key<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L413" class="LineNr"> 413 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L414" class="LineNr"> 414 </span>  <span class="Delimiter">}</span>
 <span id="L415" class="LineNr"> 415 </span><span class="Delimiter">}</span>
 <span id="L416" class="LineNr"> 416 </span>
@@ -503,8 +504,8 @@ if ('onhashchange' in window) {
 <span id="L440" class="LineNr"> 440 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L441" class="LineNr"> 441 </span>  <span class="Comment">// define a container with an address at offset 0 that we have the size for</span>
 <span id="L442" class="LineNr"> 442 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L443" class="LineNr"> 443 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L444" class="LineNr"> 444 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L443" class="LineNr"> 443 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L444" class="LineNr"> 444 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L445" class="LineNr"> 445 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo&quot;</span><span class="Delimiter">);</span>
 <span id="L446" class="LineNr"> 446 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L447" class="LineNr"> 447 </span>  <span class="Comment">// scan</span>
@@ -535,9 +536,9 @@ if ('onhashchange' in window) {
 <span id="L472" class="LineNr"> 472 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L473" class="LineNr"> 473 </span>  <span class="Comment">// define a container with an address at offset 1 that we have the size for</span>
 <span id="L474" class="LineNr"> 474 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L475" class="LineNr"> 475 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L476" class="LineNr"> 476 </span>      <span class="Constant">&quot;  y:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L477" class="LineNr"> 477 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L475" class="LineNr"> 475 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L476" class="LineNr"> 476 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L477" class="LineNr"> 477 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L478" class="LineNr"> 478 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo&quot;</span><span class="Delimiter">);</span>
 <span id="L479" class="LineNr"> 479 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L480" class="LineNr"> 480 </span>  <span class="Comment">// global metadata contains just the entry for foo</span>
@@ -568,13 +569,13 @@ if ('onhashchange' in window) {
 <span id="L505" class="LineNr"> 505 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L506" class="LineNr"> 506 </span>  <span class="Comment">// define a container with a nested container containing an address</span>
 <span id="L507" class="LineNr"> 507 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L508" class="LineNr"> 508 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L509" class="LineNr"> 509 </span>      <span class="Constant">&quot;  y:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L510" class="LineNr"> 510 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L511" class="LineNr"> 511 </span>      <span class="Constant">&quot;container bar [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L512" class="LineNr"> 512 </span>      <span class="Constant">&quot;  p:point</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L513" class="LineNr"> 513 </span>      <span class="Constant">&quot;  f:foo</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>  <span class="Comment">// nested container containing address</span>
-<span id="L514" class="LineNr"> 514 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L508" class="LineNr"> 508 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L509" class="LineNr"> 509 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L510" class="LineNr"> 510 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L511" class="LineNr"> 511 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;container bar [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L512" class="LineNr"> 512 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  p:point</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L513" class="LineNr"> 513 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  f:foo</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>  <span class="Comment">// nested container containing address</span>
+<span id="L514" class="LineNr"> 514 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L515" class="LineNr"> 515 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:bar&quot;</span><span class="Delimiter">);</span>
 <span id="L516" class="LineNr"> 516 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L517" class="LineNr"> 517 </span>  <span class="Comment">// global metadata contains entries for bar and included types: point and foo</span>
@@ -605,8 +606,8 @@ if ('onhashchange' in window) {
 <span id="L542" class="LineNr"> 542 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L543" class="LineNr"> 543 </span>  <span class="Comment">// define a container with an address at offset 0</span>
 <span id="L544" class="LineNr"> 544 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L545" class="LineNr"> 545 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L546" class="LineNr"> 546 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L545" class="LineNr"> 545 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L546" class="LineNr"> 546 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L547" class="LineNr"> 547 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:<a href='043space.cc.html#L76'>address</a>:foo&quot;</span><span class="Delimiter">);</span>
 <span id="L548" class="LineNr"> 548 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L549" class="LineNr"> 549 </span>  <span class="Comment">// global metadata contains just the entry for foo</span>
@@ -630,8 +631,8 @@ if ('onhashchange' in window) {
 <span id="L567" class="LineNr"> 567 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L568" class="LineNr"> 568 </span>  <span class="Comment">// define a container with an address at offset 0</span>
 <span id="L569" class="LineNr"> 569 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L570" class="LineNr"> 570 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L571" class="LineNr"> 571 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L570" class="LineNr"> 570 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L571" class="LineNr"> 571 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L572" class="LineNr"> 572 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:array:foo&quot;</span><span class="Delimiter">);</span>
 <span id="L573" class="LineNr"> 573 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L574" class="LineNr"> 574 </span>  <span class="Comment">// global metadata contains just the entry for foo</span>
@@ -655,8 +656,8 @@ if ('onhashchange' in window) {
 <span id="L592" class="LineNr"> 592 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L593" class="LineNr"> 593 </span>  <span class="Comment">// define a container with an address at offset 0</span>
 <span id="L594" class="LineNr"> 594 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L595" class="LineNr"> 595 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L596" class="LineNr"> 596 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L595" class="LineNr"> 595 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L596" class="LineNr"> 596 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L597" class="LineNr"> 597 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:<a href='043space.cc.html#L76'>address</a>:array:foo&quot;</span><span class="Delimiter">);</span>
 <span id="L598" class="LineNr"> 598 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L599" class="LineNr"> 599 </span>  <span class="Comment">// global metadata contains just the entry for foo</span>
@@ -680,8 +681,8 @@ if ('onhashchange' in window) {
 <span id="L617" class="LineNr"> 617 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L618" class="LineNr"> 618 </span>  <span class="Comment">// define a container with an address at offset 0</span>
 <span id="L619" class="LineNr"> 619 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L620" class="LineNr"> 620 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L621" class="LineNr"> 621 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L620" class="LineNr"> 620 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L621" class="LineNr"> 621 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L622" class="LineNr"> 622 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:array:foo:10&quot;</span><span class="Delimiter">);</span>
 <span id="L623" class="LineNr"> 623 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L624" class="LineNr"> 624 </span>  <span class="Comment">// global metadata contains just the entry for foo</span>
@@ -705,8 +706,8 @@ if ('onhashchange' in window) {
 <span id="L642" class="LineNr"> 642 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L643" class="LineNr"> 643 </span>  <span class="Comment">// define a container with an address at offset 0</span>
 <span id="L644" class="LineNr"> 644 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L645" class="LineNr"> 645 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L646" class="LineNr"> 646 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L645" class="LineNr"> 645 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L646" class="LineNr"> 646 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L647" class="LineNr"> 647 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:<a href='043space.cc.html#L76'>address</a>:array:foo:10&quot;</span><span class="Delimiter">);</span>
 <span id="L648" class="LineNr"> 648 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
 <span id="L649" class="LineNr"> 649 </span>  <span class="Comment">// global metadata contains just the entry for foo</span>
@@ -730,8 +731,8 @@ if ('onhashchange' in window) {
 <span id="L667" class="LineNr"> 667 </span>  <span class="Normal">int</span> old_size = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Container_metadata<span class="Delimiter">);</span>
 <span id="L668" class="LineNr"> 668 </span>  <span class="Comment">// define a container with an address at offset 0</span>
 <span id="L669" class="LineNr"> 669 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L670" class="LineNr"> 670 </span>      <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L671" class="LineNr"> 671 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L670" class="LineNr"> 670 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:<a href='043space.cc.html#L76'>address</a>:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L671" class="LineNr"> 671 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L672" class="LineNr"> 672 </span>  <span class="Comment">// scan a deep nest of 'address' and 'array' types modifying a container</span>
 <span id="L673" class="LineNr"> 673 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:<a href='043space.cc.html#L76'>address</a>:array:<a href='043space.cc.html#L76'>address</a>:<a href='043space.cc.html#L76'>address</a>:array:foo:10&quot;</span><span class="Delimiter">);</span>
 <span id="L674" class="LineNr"> 674 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>  <span class="Comment">// need to first pre-populate the metadata</span>
@@ -758,9 +759,9 @@ if ('onhashchange' in window) {
 <span id="L695" class="LineNr"> 695 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_container<span class="Delimiter">(</span>canonized_x<span class="Delimiter">)</span> || is_mu_exclusive_container<span class="Delimiter">(</span>canonized_x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L696" class="LineNr"> 696 </span>  <span class="Normal">const</span> container_metadata&amp; metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L697" class="LineNr"> 697 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;set&lt;tag_condition_info&gt;<span class="Delimiter">,</span> set&lt;address_element_info&gt; &gt;::const_iterator p = metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L698" class="LineNr"> 698 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L699" class="LineNr"> 699 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span>
-<span id="L700" class="LineNr"> 700 </span>      <a href='036refcount.cc.html#L43'>increment_refcount</a><span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">));</span>
+<span id="L698" class="LineNr"> 698 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L699" class="LineNr"> 699 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span>
+<span id="L700" class="LineNr"> 700 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L43'>increment_refcount</a><span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">));</span>
 <span id="L701" class="LineNr"> 701 </span>  <span class="Delimiter">}</span>
 <span id="L702" class="LineNr"> 702 </span><span class="Delimiter">}</span>
 <span id="L703" class="LineNr"> 703 </span>
@@ -775,22 +776,22 @@ if ('onhashchange' in window) {
 <span id="L712" class="LineNr"> 712 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;done reading old value of '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>canonized_x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L713" class="LineNr"> 713 </span>  <span class="Normal">const</span> container_metadata&amp; metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L714" class="LineNr"> 714 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;set&lt;tag_condition_info&gt;<span class="Delimiter">,</span> set&lt;address_element_info&gt; &gt;::const_iterator p = metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L715" class="LineNr"> 715 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L716" class="LineNr"> 716 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L717" class="LineNr"> 717 </span>      <span class="Normal">int</span> element_address = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>value + info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">);</span>
-<span id="L718" class="LineNr"> 718 </span>      reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
-<span id="L719" class="LineNr"> 719 </span>      element<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>element_address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L720" class="LineNr"> 720 </span>      element<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">);</span>
-<span id="L721" class="LineNr"> 721 </span>      <a href='036refcount.cc.html#L60'>decrement_refcount</a><span class="Delimiter">(</span>element_address<span class="Delimiter">,</span> info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">,</span> size_of<span class="Delimiter">(</span>element<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L722" class="LineNr"> 722 </span>    <span class="Delimiter">}</span>
+<span id="L715" class="LineNr"> 715 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L716" class="LineNr"> 716 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L717" class="LineNr"> 717 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> element_address = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> canonized_x<span class="Delimiter">.</span>value + info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">);</span>
+<span id="L718" class="LineNr"> 718 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
+<span id="L719" class="LineNr"> 719 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> element<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>element_address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L720" class="LineNr"> 720 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> element<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">);</span>
+<span id="L721" class="LineNr"> 721 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L60'>decrement_refcount</a><span class="Delimiter">(</span>element_address<span class="Delimiter">,</span> info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">,</span> size_of<span class="Delimiter">(</span>element<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L722" class="LineNr"> 722 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L723" class="LineNr"> 723 </span>  <span class="Delimiter">}</span>
 <span id="L724" class="LineNr"> 724 </span><span class="Delimiter">}</span>
 <span id="L725" class="LineNr"> 725 </span>
 <span id="L726" class="LineNr"> 726 </span><span class="Delimiter">:(code)</span>
 <span id="L727" class="LineNr"> 727 </span><span class="Normal">bool</span> <a href='036refcount.cc.html#L727'>all_match</a><span class="Delimiter">(</span><span class="Normal">const</span> vector&lt;<span class="Normal">double</span>&gt;&amp; data<span class="Delimiter">,</span> <span class="Normal">const</span> set&lt;tag_condition_info&gt;&amp; conditions<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L728" class="LineNr"> 728 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;tag_condition_info&gt;::const_iterator p = conditions<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != conditions<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L729" class="LineNr"> 729 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> != p<span class="Delimiter">-&gt;</span>tag<span class="Delimiter">)</span>
-<span id="L730" class="LineNr"> 730 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L729" class="LineNr"> 729 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>data<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> != p<span class="Delimiter">-&gt;</span>tag<span class="Delimiter">)</span>
+<span id="L730" class="LineNr"> 730 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L731" class="LineNr"> 731 </span>  <span class="Delimiter">}</span>
 <span id="L732" class="LineNr"> 732 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L733" class="LineNr"> 733 </span><span class="Delimiter">}</span>
diff --git a/html/037abandon.cc.html b/html/037abandon.cc.html
index c686c4cc..78af3348 100644
--- a/html/037abandon.cc.html
+++ b/html/037abandon.cc.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.Special { color: #c00000; }
+.CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
-.CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
 -->
 </style>
@@ -95,25 +96,25 @@ if ('onhashchange' in window) {
 <span id="L32" class="LineNr"> 32 </span><span class="CommentedCode">//?   cerr &lt;&lt; &quot;abandon: &quot; &lt;&lt; size &lt;&lt; '\n';</span>
 <span id="L33" class="LineNr"> 33 </span>  <span class="Comment">// decrement any contained refcounts</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L35" class="LineNr"> 35 </span>    reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
-<span id="L36" class="LineNr"> 36 </span>    element<span class="Delimiter">.</span>type = <a href='032array.cc.html#L366'>copy_array_element</a><span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">);</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="Normal">int</span> <a href='032array.cc.html#L386'>array_length</a> = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L38" class="LineNr"> 38 </span>    assert<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
-<span id="L39" class="LineNr"> 39 </span>    <span class="Normal">int</span> element_size = size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
-<span id="L40" class="LineNr"> 40 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='032array.cc.html#L386'>array_length</a><span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L41" class="LineNr"> 41 </span>      element<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a> + <span class="Comment">/*</span><span class="Comment">skip refcount and length</span><span class="Comment">*/</span><span class="Constant">2</span> + i*element_size<span class="Delimiter">);</span>
-<span id="L42" class="LineNr"> 42 </span>      <a href='036refcount.cc.html#L51'>decrement_any_refcounts</a><span class="Delimiter">(</span>element<span class="Delimiter">);</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Delimiter">}</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> element<span class="Delimiter">;</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> element<span class="Delimiter">.</span>type = <a href='032array.cc.html#L366'>copy_array_element</a><span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">);</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> <a href='032array.cc.html#L386'>array_length</a> = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> element_size = size_of<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='032array.cc.html#L386'>array_length</a><span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> element<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a> + <span class="Comment">/*</span><span class="Comment">skip refcount and length</span><span class="Comment">*/</span><span class="Constant">2</span> + i*element_size<span class="Delimiter">);</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='036refcount.cc.html#L51'>decrement_any_refcounts</a><span class="Delimiter">(</span>element<span class="Delimiter">);</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Delimiter">}</span>
 <span id="L45" class="LineNr"> 45 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_container<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">)</span> || is_mu_exclusive_container<span class="Delimiter">(</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L46" class="LineNr"> 46 </span>    reagent tmp<span class="Delimiter">;</span>
-<span id="L47" class="LineNr"> 47 </span>    tmp<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*payload_type<span class="Delimiter">);</span>
-<span id="L48" class="LineNr"> 48 </span>    tmp<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L49" class="LineNr"> 49 </span>    <a href='036refcount.cc.html#L51'>decrement_any_refcounts</a><span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> reagent tmp<span class="Delimiter">;</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> tmp<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*payload_type<span class="Delimiter">);</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> tmp<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a> + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <a href='036refcount.cc.html#L51'>decrement_any_refcounts</a><span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
 <span id="L50" class="LineNr"> 50 </span>  <span class="Delimiter">}</span>
 <span id="L51" class="LineNr"> 51 </span>  <span class="Comment">// clear memory</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = <a href='043space.cc.html#L76'>address</a><span class="Delimiter">;</span>  curr &lt; address+payload_size<span class="Delimiter">;</span>  ++curr<span class="Delimiter">)</span>
-<span id="L53" class="LineNr"> 53 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L54" class="LineNr"> 54 </span>  <span class="Comment">// append existing free list to address</span>
 <span id="L55" class="LineNr"> 55 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;abandon&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;saving &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <span class="Constant">&quot; in free-list of size &quot;</span> &lt;&lt; <a href='036refcount.cc.html#L82'>payload_size</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L56" class="LineNr"> 56 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> <a href='036refcount.cc.html#L82'>payload_size</a><span class="Delimiter">));</span>
@@ -128,10 +129,10 @@ if ('onhashchange' in window) {
 <span id="L65" class="LineNr"> 65 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>free_list<span class="Delimiter">,</span> size<span class="Delimiter">,</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result<span class="Delimiter">));</span>
 <span id="L66" class="LineNr"> 66 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = result<span class="Delimiter">;</span>  curr &lt; result+size<span class="Delimiter">;</span>  ++curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr"> 69 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;memory in free list was not zeroed out: &quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">'/'</span> &lt;&lt; result &lt;&lt; <span class="Constant">&quot;; somebody wrote to us after free!!!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// always fatal</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;memory in free list was not zeroed out: &quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">'/'</span> &lt;&lt; result &lt;&lt; <span class="Constant">&quot;; somebody wrote to us after free!!!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// always fatal</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L72" class="LineNr"> 72 </span>  <span class="Delimiter">}</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L74" class="LineNr"> 74 </span><span class="Delimiter">}</span>
diff --git a/html/038new_text.cc.html b/html/038new_text.cc.html
index 53a0e19c..f980c835 100644
--- a/html/038new_text.cc.html
+++ b/html/038new_text.cc.html
@@ -16,17 +16,18 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
-.CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .SalientComment { color: #00ffff; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
+.CommentedCode { color: #6c6c6c; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -91,10 +92,10 @@ if ('onhashchange' in window) {
 <span id="L28" class="LineNr"> 28 </span><span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;new&quot;</span> &amp;&amp; <a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
 <span id="L29" class="LineNr"> 29 </span><span class="Delimiter">:(after &quot;case NEW&quot; following &quot;Primitive Recipe Implementations&quot;)</span>
 <span id="L30" class="LineNr"> 30 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L31" class="LineNr"> 31 </span>    products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L32" class="LineNr"> 32 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L33" class="LineNr"> 33 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new string alloc: &quot;</span> &lt;&lt; products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L34" class="LineNr"> 34 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new string alloc: &quot;</span> &lt;&lt; products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Delimiter">}</span>
 <span id="L36" class="LineNr"> 36 </span>
 <span id="L37" class="LineNr"> 37 </span><span class="Delimiter">:(code)</span>
@@ -113,13 +114,13 @@ if ('onhashchange' in window) {
 <span id="L50" class="LineNr"> 50 </span>  <span class="Normal">int</span> curr = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L51" class="LineNr"> 51 </span>  <span class="Normal">const</span> <span class="Normal">char</span>* raw_contents = contents<span class="Delimiter">.</span>c_str<span class="Delimiter">();</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; string_length<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L53" class="LineNr"> 53 </span>    <span class="Normal">uint32_t</span> curr_character<span class="Delimiter">;</span>
-<span id="L54" class="LineNr"> 54 </span>    assert<span class="Delimiter">(</span>curr &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">));</span>
-<span id="L55" class="LineNr"> 55 </span>    tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;curr_character<span class="Delimiter">,</span> &amp;raw_contents[curr]<span class="Delimiter">);</span>
-<span id="L56" class="LineNr"> 56 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing string character &quot;</span> &lt;&lt; curr_character &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L57" class="LineNr"> 57 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> curr_character<span class="Delimiter">);</span>
-<span id="L58" class="LineNr"> 58 </span>    curr += tb_utf8_char_length<span class="Delimiter">(</span>raw_contents[curr]<span class="Delimiter">);</span>
-<span id="L59" class="LineNr"> 59 </span>    ++curr_address<span class="Delimiter">;</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Normal">uint32_t</span> curr_character<span class="Delimiter">;</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">));</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;curr_character<span class="Delimiter">,</span> &amp;raw_contents[curr]<span class="Delimiter">);</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing string character &quot;</span> &lt;&lt; curr_character &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> curr_character<span class="Delimiter">);</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> curr += tb_utf8_char_length<span class="Delimiter">(</span>raw_contents[curr]<span class="Delimiter">);</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> ++curr_address<span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Delimiter">}</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Comment">// Mu strings are not null-terminated in memory.</span>
 <span id="L62" class="LineNr"> 62 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
@@ -196,9 +197,9 @@ if ('onhashchange' in window) {
 <span id="L133" class="LineNr">133 </span>  <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Normal">int</span> curr = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>curr &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// carefully bounds-check on the string</span>
-<span id="L136" class="LineNr">136 </span>    <span class="Comment">// before accessing its raw pointer</span>
-<span id="L137" class="LineNr">137 </span>    ++result<span class="Delimiter">;</span>
-<span id="L138" class="LineNr">138 </span>    curr += tb_utf8_char_length<span class="Delimiter">(</span>in[curr]<span class="Delimiter">);</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Comment">// before accessing its raw pointer</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> ++result<span class="Delimiter">;</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> curr += tb_utf8_char_length<span class="Delimiter">(</span>in[curr]<span class="Delimiter">);</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
 <span id="L140" class="LineNr">140 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L141" class="LineNr">141 </span><span class="Delimiter">}</span>
@@ -210,7 +211,7 @@ if ('onhashchange' in window) {
 <span id="L147" class="LineNr">147 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>size == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
 <span id="L148" class="LineNr">148 </span>  ostringstream tmp<span class="Delimiter">;</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> curr = address+<span class="Constant">1</span><span class="Delimiter">;</span>  curr &lt;= address+size<span class="Delimiter">;</span>  ++curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L150" class="LineNr">150 </span>    tmp &lt;&lt; to_unicode<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)));</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> tmp &lt;&lt; to_unicode<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)));</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Identifier">return</span> tmp<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L153" class="LineNr">153 </span><span class="Delimiter">}</span>
@@ -233,26 +234,26 @@ if ('onhashchange' in window) {
 <span id="L170" class="LineNr">170 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L171" class="LineNr">171 </span><span class="Normal">case</span> ASSERT: <span class="Delimiter">{</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L173" class="LineNr">173 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'assert' takes exactly two ingredients rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L174" class="LineNr">174 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'assert' takes exactly two ingredients rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Delimiter">}</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_scalar<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L177" class="LineNr">177 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'assert' requires a boolean for its first ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L178" class="LineNr">178 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'assert' requires a boolean for its first ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Delimiter">}</span>
 <span id="L180" class="LineNr">180 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &amp;&amp; !is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L181" class="LineNr">181 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'assert' requires a text as its second ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L182" class="LineNr">182 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'assert' requires a text as its second ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Delimiter">}</span>
 <span id="L184" class="LineNr">184 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L185" class="LineNr">185 </span><span class="Delimiter">}</span>
 <span id="L186" class="LineNr">186 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L187" class="LineNr">187 </span><span class="Normal">case</span> ASSERT: <span class="Delimiter">{</span>
 <span id="L188" class="LineNr">188 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L189" class="LineNr">189 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span>
-<span id="L190" class="LineNr">190 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L191" class="LineNr">191 </span>    <span class="Normal">else</span>
-<span id="L192" class="LineNr">192 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Delimiter">}</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L195" class="LineNr">195 </span><span class="Delimiter">}</span>
@@ -273,7 +274,7 @@ if ('onhashchange' in window) {
 <span id="L210" class="LineNr">210 </span>  <a href='038new_text.cc.html#L220'>skip_whitespace</a><span class="Delimiter">(</span>cin<span class="Delimiter">);</span>
 <span id="L211" class="LineNr">211 </span>  string result<span class="Delimiter">;</span>
 <span id="L212" class="LineNr">212 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>cin<span class="Delimiter">))</span>
-<span id="L213" class="LineNr">213 </span>    cin &gt;&gt; result<span class="Delimiter">;</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> cin &gt;&gt; result<span class="Delimiter">;</span>
 <span id="L214" class="LineNr">214 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L215" class="LineNr">215 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>result<span class="Delimiter">));</span>
 <span id="L216" class="LineNr">216 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -282,9 +283,9 @@ if ('onhashchange' in window) {
 <span id="L219" class="LineNr">219 </span><span class="Delimiter">:(code)</span>
 <span id="L220" class="LineNr">220 </span><span class="Normal">void</span> <a href='038new_text.cc.html#L220'>skip_whitespace</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L222" class="LineNr">222 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L223" class="LineNr">223 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L224" class="LineNr">224 </span>    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L225" class="LineNr">225 </span>  <span class="Delimiter">}</span>
 <span id="L226" class="LineNr">226 </span><span class="Delimiter">}</span>
 </pre>
diff --git a/html/039location_array.cc.html b/html/039location_array.cc.html
index eb39d030..e1d9eb02 100644
--- a/html/039location_array.cc.html
+++ b/html/039location_array.cc.html
@@ -16,12 +16,13 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Comment { color: #9090ff; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -64,8 +65,8 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr"> 6 </span><span class="Normal">case</span> TO_LOCATION_ARRAY: <span class="Delimiter">{</span>
 <span id="L7" class="LineNr"> 7 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L8" class="LineNr"> 8 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_address_of_array_of_numbers<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L9" class="LineNr"> 9 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'to-location-array' has incorrect type: '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L10" class="LineNr">10 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L9" class="LineNr"> 9 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of 'to-location-array' has incorrect type: '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L10" class="LineNr">10 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L11" class="LineNr">11 </span>  <span class="Delimiter">}</span>
 <span id="L12" class="LineNr">12 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L13" class="LineNr">13 </span><span class="Delimiter">}</span>
@@ -99,7 +100,7 @@ if ('onhashchange' in window) {
 <span id="L41" class="LineNr">41 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Constant">1</span><span class="Delimiter">,</span> array_size<span class="Delimiter">);</span>
 <span id="L42" class="LineNr">42 </span>  <span class="Comment">// now copy over data</span>
 <span id="L43" class="LineNr">43 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; array_size<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span>
-<span id="L44" class="LineNr">44 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Constant">2</span>+i<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L44" class="LineNr">44 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> result+<span class="Constant">2</span>+i<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L45" class="LineNr">45 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L46" class="LineNr">46 </span><span class="Delimiter">}</span>
 </pre>
diff --git a/html/040brace.cc.html b/html/040brace.cc.html
index 2a1e286a..3befa819 100644
--- a/html/040brace.cc.html
+++ b/html/040brace.cc.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .muRecipe { color: #ff8700; }
-.traceContains { color: #008000; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
+.Constant { color: #00a0a0; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -84,11 +85,11 @@ if ('onhashchange' in window) {
 <span id="L23" class="LineNr"> 23 </span><span class="Delimiter">:(scenario brace_conversion)</span>
 <span id="L24" class="LineNr"> 24 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L25" class="LineNr"> 25 </span>  <span class="Delimiter">{</span>
-<span id="L26" class="LineNr"> 26 </span>    <span class="Identifier">break</span>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L28" class="LineNr"> 28 </span>  <span class="Delimiter">}</span>
 <span id="L29" class="LineNr"> 29 </span>]
-<span id="L30" class="LineNr"> 30 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L30" class="LineNr"> 30 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L31" class="LineNr"> 31 </span><span class="traceContains">+transform: jump 1:offset</span>
 <span id="L32" class="LineNr"> 32 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L33" class="LineNr"> 33 </span>
@@ -100,95 +101,95 @@ if ('onhashchange' in window) {
 <span id="L39" class="LineNr"> 39 </span>  <span class="Normal">const</span> <span class="Normal">int</span> OPEN = <span class="Constant">0</span><span class="Delimiter">,</span> CLOSE = <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Comment">// use signed integer for step index because we'll be doing arithmetic on it</span>
 <span id="L41" class="LineNr"> 41 </span>  list&lt;pair&lt;<span class="Normal">int</span><span class="Comment">/*</span><span class="Comment">OPEN/CLOSE</span><span class="Comment">*/</span><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">step</span><span class="Comment">*/</span><span class="Normal">int</span>&gt; &gt; braces<span class="Delimiter">;</span>
-<span id="L42" class="LineNr"> 42 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L42" class="LineNr"> 42 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L43" class="LineNr"> 43 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L44" class="LineNr"> 44 </span>    <span class="Normal">const</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;{&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L46" class="LineNr"> 46 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;push (open, &quot;</span> &lt;&lt; index &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L47" class="LineNr"> 47 </span>      braces<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span><span class="Normal">int</span>&gt;<span class="Delimiter">(</span>OPEN<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
-<span id="L48" class="LineNr"> 48 </span>    <span class="Delimiter">}</span>
-<span id="L49" class="LineNr"> 49 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L50" class="LineNr"> 50 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;push (close, &quot;</span> &lt;&lt; index &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L51" class="LineNr"> 51 </span>      braces<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span><span class="Normal">int</span>&gt;<span class="Delimiter">(</span>CLOSE<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
-<span id="L52" class="LineNr"> 52 </span>    <span class="Delimiter">}</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;{&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;push (open, &quot;</span> &lt;&lt; index &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> braces<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span><span class="Normal">int</span>&gt;<span class="Delimiter">(</span>OPEN<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;push (close, &quot;</span> &lt;&lt; index &lt;&lt; <span class="Constant">&quot;)&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> braces<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span><span class="Normal">int</span>&gt;<span class="Delimiter">(</span>CLOSE<span class="Delimiter">,</span> index<span class="Delimiter">));</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L53" class="LineNr"> 53 </span>  <span class="Delimiter">}</span>
 <span id="L54" class="LineNr"> 54 </span>  stack&lt;<span class="Comment">/*</span><span class="Comment">step</span><span class="Comment">*/</span><span class="Normal">int</span>&gt; open_braces<span class="Delimiter">;</span>
 <span id="L55" class="LineNr"> 55 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L56" class="LineNr"> 56 </span>    instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L57" class="LineNr"> 57 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;{&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L58" class="LineNr"> 58 </span>      open_braces<span class="Delimiter">.</span>push<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L59" class="LineNr"> 59 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L60" class="LineNr"> 60 </span>    <span class="Delimiter">}</span>
-<span id="L61" class="LineNr"> 61 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L63" class="LineNr"> 63 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;missing '{' in '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L64" class="LineNr"> 64 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L65" class="LineNr"> 65 </span>      <span class="Delimiter">}</span>
-<span id="L66" class="LineNr"> 66 </span>      open_braces<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
-<span id="L67" class="LineNr"> 67 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Delimiter">}</span>
-<span id="L69" class="LineNr"> 69 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L70" class="LineNr"> 70 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;loop&quot;</span>
-<span id="L71" class="LineNr"> 71 </span>         &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;loop-if&quot;</span>
-<span id="L72" class="LineNr"> 72 </span>         &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;loop-unless&quot;</span>
-<span id="L73" class="LineNr"> 73 </span>         &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;break&quot;</span>
-<span id="L74" class="LineNr"> 74 </span>         &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;break-if&quot;</span>
-<span id="L75" class="LineNr"> 75 </span>         &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L76" class="LineNr"> 76 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; ...&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L77" class="LineNr"> 77 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L78" class="LineNr"> 78 </span>    <span class="Delimiter">}</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Comment">// check for errors</span>
-<span id="L80" class="LineNr"> 80 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos || inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L81" class="LineNr"> 81 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L82" class="LineNr"> 82 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' expects 1 or 2 ingredients, but got none</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L83" class="LineNr"> 83 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L84" class="LineNr"> 84 </span>      <span class="Delimiter">}</span>
-<span id="L85" class="LineNr"> 85 </span>    <span class="Delimiter">}</span>
-<span id="L86" class="LineNr"> 86 </span>    <span class="Comment">// update instruction operation</span>
-<span id="L87" class="LineNr"> 87 </span>    string old_name = inst<span class="Delimiter">.</span>name<span class="Delimiter">;</span>  <span class="Comment">// save a copy</span>
-<span id="L88" class="LineNr"> 88 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>      inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump-if&quot;</span><span class="Delimiter">;</span>
-<span id="L90" class="LineNr"> 90 </span>      inst<span class="Delimiter">.</span>operation = JUMP_IF<span class="Delimiter">;</span>
-<span id="L91" class="LineNr"> 91 </span>    <span class="Delimiter">}</span>
-<span id="L92" class="LineNr"> 92 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L93" class="LineNr"> 93 </span>      inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump-unless&quot;</span><span class="Delimiter">;</span>
-<span id="L94" class="LineNr"> 94 </span>      inst<span class="Delimiter">.</span>operation = JUMP_UNLESS<span class="Delimiter">;</span>
-<span id="L95" class="LineNr"> 95 </span>    <span class="Delimiter">}</span>
-<span id="L96" class="LineNr"> 96 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L97" class="LineNr"> 97 </span>      inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">;</span>
-<span id="L98" class="LineNr"> 98 </span>      inst<span class="Delimiter">.</span>operation = JUMP<span class="Delimiter">;</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="Delimiter">}</span>
-<span id="L100" class="LineNr">100 </span>    <span class="Comment">// check for explicitly provided targets</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos || inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L102" class="LineNr">102 </span>      <span class="Comment">// conditional branches check arg 1</span>
-<span id="L103" class="LineNr">103 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span> &amp;&amp; is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L104" class="LineNr">104 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
-<span id="L105" class="LineNr">105 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L106" class="LineNr">106 </span>      <span class="Delimiter">}</span>
-<span id="L107" class="LineNr">107 </span>    <span class="Delimiter">}</span>
-<span id="L108" class="LineNr">108 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L109" class="LineNr">109 </span>      <span class="Comment">// unconditional branches check arg 0</span>
-<span id="L110" class="LineNr">110 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L111" class="LineNr">111 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
-<span id="L112" class="LineNr">112 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L113" class="LineNr">113 </span>      <span class="Delimiter">}</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Delimiter">}</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Comment">// if implicit, compute target</span>
-<span id="L116" class="LineNr">116 </span>    reagent target<span class="Delimiter">;</span>
-<span id="L117" class="LineNr">117 </span>    target<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;offset&quot;</span><span class="Delimiter">);</span>
-<span id="L118" class="LineNr">118 </span>    target<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L119" class="LineNr">119 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L120" class="LineNr">120 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; old_name &lt;&lt; <span class="Constant">&quot;' needs a '{' before</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L121" class="LineNr">121 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;loop&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span>
-<span id="L122" class="LineNr">122 </span>      target<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>top<span class="Delimiter">()</span>-index<span class="Delimiter">);</span>
-<span id="L123" class="LineNr">123 </span>    <span class="Normal">else</span>  <span class="Comment">// break instruction</span>
-<span id="L124" class="LineNr">124 </span>      target<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='040brace.cc.html#L136'>matching_brace</a><span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>top<span class="Delimiter">(),</span> braces<span class="Delimiter">,</span> r<span class="Delimiter">)</span> - index - <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L125" class="LineNr">125 </span>    inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>target<span class="Delimiter">);</span>
-<span id="L126" class="LineNr">126 </span>    <span class="Comment">// log computed target</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">)</span>
-<span id="L128" class="LineNr">128 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>target<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
-<span id="L129" class="LineNr">129 </span>    <span class="Normal">else</span>
-<span id="L130" class="LineNr">130 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>target<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;{&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> open_braces<span class="Delimiter">.</span>push<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;missing '{' in '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> open_braces<span class="Delimiter">.</span>pop<span class="Delimiter">();</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;loop&quot;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;loop-if&quot;</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;loop-unless&quot;</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;break&quot;</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;break-if&quot;</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>&amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; ...&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Comment">// check for errors</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos || inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' expects 1 or 2 ingredients, but got none</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Comment">// update instruction operation</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> string old_name = inst<span class="Delimiter">.</span>name<span class="Delimiter">;</span>  <span class="Comment">// save a copy</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump-if&quot;</span><span class="Delimiter">;</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>operation = JUMP_IF<span class="Delimiter">;</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump-unless&quot;</span><span class="Delimiter">;</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>operation = JUMP_UNLESS<span class="Delimiter">;</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>operation = JUMP<span class="Delimiter">;</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Comment">// check for explicitly provided targets</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-if&quot;</span><span class="Delimiter">)</span> != string::npos || inst<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;-unless&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// conditional branches check arg 1</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span> &amp;&amp; is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// unconditional branches check arg 0</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Comment">// if implicit, compute target</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> reagent target<span class="Delimiter">;</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> target<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;offset&quot;</span><span class="Delimiter">);</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> target<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; old_name &lt;&lt; <span class="Constant">&quot;' needs a '{' before</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>old_name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;loop&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> target<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>top<span class="Delimiter">()</span>-index<span class="Delimiter">);</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>  <span class="Comment">// break instruction</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> target<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='040brace.cc.html#L136'>matching_brace</a><span class="Delimiter">(</span>open_braces<span class="Delimiter">.</span>top<span class="Delimiter">(),</span> braces<span class="Delimiter">,</span> r<span class="Delimiter">)</span> - index - <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>target<span class="Delimiter">);</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Comment">// log computed target</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">)</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>target<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">' '</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>target<span class="Delimiter">.</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;:offset</span><span class="Constant">&quot; &lt;&lt; end();</span>
 <span id="L131" class="LineNr">131 </span>  <span class="Delimiter">}</span>
 <span id="L132" class="LineNr">132 </span><span class="Delimiter">}</span>
 <span id="L133" class="LineNr">133 </span>
@@ -197,9 +198,9 @@ if ('onhashchange' in window) {
 <span id="L136" class="LineNr">136 </span><span class="Normal">int</span> <a href='040brace.cc.html#L136'>matching_brace</a><span class="Delimiter">(</span><span class="Normal">int</span> index<span class="Delimiter">,</span> <span class="Normal">const</span> list&lt;pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt; &gt;&amp; braces<span class="Delimiter">,</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Normal">int</span> stacksize = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>list&lt;pair&lt;<span class="Normal">int</span><span class="Delimiter">,</span> <span class="Normal">int</span>&gt; &gt;::const_iterator p = braces<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != braces<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L139" class="LineNr">139 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second &lt; index<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L140" class="LineNr">140 </span>    stacksize += <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first ? <span class="Constant">1</span> : -<span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L141" class="LineNr">141 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>stacksize == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second &lt; index<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> stacksize += <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first ? <span class="Constant">1</span> : -<span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>stacksize == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
 <span id="L142" class="LineNr">142 </span>  <span class="Delimiter">}</span>
 <span id="L143" class="LineNr">143 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;unbalanced '{'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L144" class="LineNr">144 </span>  <span class="Identifier">return</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  <span class="Comment">// exit current routine</span>
@@ -210,11 +211,11 @@ if ('onhashchange' in window) {
 <span id="L149" class="LineNr">149 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">{</span>
-<span id="L152" class="LineNr">152 </span>    <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L153" class="LineNr">153 </span>    loop
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> loop
 <span id="L154" class="LineNr">154 </span>  <span class="Delimiter">}</span>
 <span id="L155" class="LineNr">155 </span>]
-<span id="L156" class="LineNr">156 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L156" class="LineNr">156 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L157" class="LineNr">157 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L158" class="LineNr">158 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L159" class="LineNr">159 </span><span class="traceContains">+transform: copy ...</span>
@@ -224,10 +225,10 @@ if ('onhashchange' in window) {
 <span id="L163" class="LineNr">163 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L164" class="LineNr">164 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Delimiter">{</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Identifier">break</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
 <span id="L167" class="LineNr">167 </span>  <span class="Delimiter">}</span>
 <span id="L168" class="LineNr">168 </span>]
-<span id="L169" class="LineNr">169 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L169" class="LineNr">169 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L170" class="LineNr">170 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L171" class="LineNr">171 </span><span class="traceContains">+transform: jump 0:offset</span>
 <span id="L172" class="LineNr">172 </span>
@@ -235,13 +236,13 @@ if ('onhashchange' in window) {
 <span id="L174" class="LineNr">174 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L175" class="LineNr">175 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Delimiter">{</span>
-<span id="L177" class="LineNr">177 </span>    <span class="Identifier">break</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
 <span id="L178" class="LineNr">178 </span>  <span class="Delimiter">}</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Delimiter">{</span>
-<span id="L180" class="LineNr">180 </span>    <span class="Identifier">break</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
 <span id="L181" class="LineNr">181 </span>  <span class="Delimiter">}</span>
 <span id="L182" class="LineNr">182 </span>]
-<span id="L183" class="LineNr">183 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L183" class="LineNr">183 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L184" class="LineNr">184 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L185" class="LineNr">185 </span><span class="traceContains">+transform: jump 0:offset</span>
 <span id="L186" class="LineNr">186 </span><span class="traceContains">+transform: jump 0:offset</span>
@@ -251,14 +252,14 @@ if ('onhashchange' in window) {
 <span id="L190" class="LineNr">190 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L191" class="LineNr">191 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L192" class="LineNr">192 </span>  <span class="Delimiter">{</span>
-<span id="L193" class="LineNr">193 </span>    <span class="Identifier">break</span>
-<span id="L194" class="LineNr">194 </span>    <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L195" class="LineNr">195 </span>  <span class="Delimiter">}</span>
 <span id="L196" class="LineNr">196 </span>  <span class="Delimiter">{</span>
-<span id="L197" class="LineNr">197 </span>    <span class="Identifier">break</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
 <span id="L198" class="LineNr">198 </span>  <span class="Delimiter">}</span>
 <span id="L199" class="LineNr">199 </span>]
-<span id="L200" class="LineNr">200 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L200" class="LineNr">200 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L201" class="LineNr">201 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L202" class="LineNr">202 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L203" class="LineNr">203 </span><span class="traceContains">+transform: jump 1:offset</span>
@@ -270,14 +271,14 @@ if ('onhashchange' in window) {
 <span id="L209" class="LineNr">209 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L210" class="LineNr">210 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L211" class="LineNr">211 </span>  <span class="Delimiter">{</span>
-<span id="L212" class="LineNr">212 </span>    <span class="Identifier">break</span>-<span class="Normal">if</span> <span class="Constant">2</span>:num
-<span id="L213" class="LineNr">213 </span>    <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>-<span class="Normal">if</span> <span class="Constant">2</span>:num
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Delimiter">}</span>
 <span id="L215" class="LineNr">215 </span>  <span class="Delimiter">{</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Identifier">break</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Delimiter">}</span>
 <span id="L218" class="LineNr">218 </span>]
-<span id="L219" class="LineNr">219 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L219" class="LineNr">219 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L220" class="LineNr">220 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L221" class="LineNr">221 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L222" class="LineNr">222 </span><span class="traceContains">+transform: jump-if 2, 1:offset</span>
@@ -288,12 +289,12 @@ if ('onhashchange' in window) {
 <span id="L227" class="LineNr">227 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L228" class="LineNr">228 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L229" class="LineNr">229 </span>  <span class="Delimiter">{</span>
-<span id="L230" class="LineNr">230 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L231" class="LineNr">231 </span>    <span class="Identifier">break</span>
-<span id="L232" class="LineNr">232 </span>    <span class="Delimiter">{</span>
-<span id="L233" class="LineNr">233 </span>      <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L234" class="LineNr">234 </span>    <span class="Delimiter">}</span>
-<span id="L235" class="LineNr">235 </span>    <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L236" class="LineNr">236 </span>  <span class="Delimiter">}</span>
 <span id="L237" class="LineNr">237 </span>]
 <span id="L238" class="LineNr">238 </span><span class="traceContains">+transform: jump 4:offset</span>
@@ -302,11 +303,11 @@ if ('onhashchange' in window) {
 <span id="L241" class="LineNr">241 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L242" class="LineNr">242 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L243" class="LineNr">243 </span>  <span class="Delimiter">{</span>
-<span id="L244" class="LineNr">244 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L245" class="LineNr">245 </span>    <span class="Identifier">break</span>
-<span id="L246" class="LineNr">246 </span>    <span class="Delimiter">{</span>
-<span id="L247" class="LineNr">247 </span>    <span class="Delimiter">}</span>
-<span id="L248" class="LineNr">248 </span>    <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L249" class="LineNr">249 </span>  <span class="Delimiter">}</span>
 <span id="L250" class="LineNr">250 </span>]
 <span id="L251" class="LineNr">251 </span><span class="traceContains">+transform: jump 3:offset</span>
@@ -315,10 +316,10 @@ if ('onhashchange' in window) {
 <span id="L254" class="LineNr">254 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L255" class="LineNr">255 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L256" class="LineNr">256 </span>  <span class="Delimiter">{</span>
-<span id="L257" class="LineNr">257 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L258" class="LineNr">258 </span>    <span class="Identifier">break</span>
-<span id="L259" class="LineNr">259 </span>    <span class="Delimiter">{</span>
-<span id="L260" class="LineNr">260 </span>    <span class="Delimiter">}</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L261" class="LineNr">261 </span>  <span class="Delimiter">}</span>
 <span id="L262" class="LineNr">262 </span>]
 <span id="L263" class="LineNr">263 </span><span class="traceContains">+transform: jump 2:offset</span>
@@ -328,7 +329,7 @@ if ('onhashchange' in window) {
 <span id="L267" class="LineNr">267 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L268" class="LineNr">268 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L269" class="LineNr">269 </span>  <span class="Delimiter">{</span>
-<span id="L270" class="LineNr">270 </span>    <span class="Identifier">break</span> <span class="Constant">+foo:offset</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span> <span class="Constant">+foo:offset</span>
 <span id="L271" class="LineNr">271 </span>  <span class="Delimiter">}</span>
 <span id="L272" class="LineNr">272 </span>]
 <span id="L273" class="LineNr">273 </span><span class="traceContains">+transform: jump +foo:offset</span>
@@ -338,11 +339,11 @@ if ('onhashchange' in window) {
 <span id="L277" class="LineNr">277 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L278" class="LineNr">278 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L279" class="LineNr">279 </span>  <span class="Delimiter">{</span>
-<span id="L280" class="LineNr">280 </span>    <span class="Identifier">break</span>-unless <span class="Constant">2</span>:num
-<span id="L281" class="LineNr">281 </span>    <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>-unless <span class="Constant">2</span>:num
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L282" class="LineNr">282 </span>  <span class="Delimiter">}</span>
 <span id="L283" class="LineNr">283 </span>]
-<span id="L284" class="LineNr">284 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L284" class="LineNr">284 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L285" class="LineNr">285 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L286" class="LineNr">286 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L287" class="LineNr">287 </span><span class="traceContains">+transform: jump-unless 2, 1:offset</span>
@@ -353,11 +354,11 @@ if ('onhashchange' in window) {
 <span id="L292" class="LineNr">292 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L293" class="LineNr">293 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L294" class="LineNr">294 </span>  <span class="Delimiter">{</span>
-<span id="L295" class="LineNr">295 </span>    loop-unless <span class="Constant">2</span>:num
-<span id="L296" class="LineNr">296 </span>    <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> loop-unless <span class="Constant">2</span>:num
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L297" class="LineNr">297 </span>  <span class="Delimiter">}</span>
 <span id="L298" class="LineNr">298 </span>]
-<span id="L299" class="LineNr">299 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L299" class="LineNr">299 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L300" class="LineNr">300 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L301" class="LineNr">301 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L302" class="LineNr">302 </span><span class="traceContains">+transform: jump-unless 2, -1:offset</span>
@@ -367,15 +368,15 @@ if ('onhashchange' in window) {
 <span id="L306" class="LineNr">306 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L307" class="LineNr">307 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L308" class="LineNr">308 </span>  <span class="Delimiter">{</span>
-<span id="L309" class="LineNr">309 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L310" class="LineNr">310 </span>    <span class="Delimiter">{</span>
-<span id="L311" class="LineNr">311 </span>      <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L312" class="LineNr">312 </span>    <span class="Delimiter">}</span>
-<span id="L313" class="LineNr">313 </span>    loop-<span class="Normal">if</span> <span class="Constant">4</span>:<span class="Normal">bool</span>
-<span id="L314" class="LineNr">314 </span>    <span class="Constant">5</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L310" class="LineNr">310 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> loop-<span class="Normal">if</span> <span class="Constant">4</span>:<span class="Normal">bool</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> <span class="Constant">5</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Delimiter">}</span>
 <span id="L316" class="LineNr">316 </span>]
-<span id="L317" class="LineNr">317 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L317" class="LineNr">317 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L318" class="LineNr">318 </span><span class="traceContains">+transform: jump-if 4, -5:offset</span>
 <span id="L319" class="LineNr">319 </span>
 <span id="L320" class="LineNr">320 </span><span class="Delimiter">:(scenario loop_label)</span>
@@ -384,7 +385,7 @@ if ('onhashchange' in window) {
 <span id="L323" class="LineNr">323 </span>  +foo
 <span id="L324" class="LineNr">324 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 <span id="L325" class="LineNr">325 </span>]
-<span id="L326" class="LineNr">326 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L98'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
+<span id="L326" class="LineNr">326 </span><span class="traceContains">+transform: --- <a href='012transform.cc.html#L99'>transform</a> braces for <a href='010vm.cc.html#L19'>recipe</a> <a href='000organization.cc.html#L113'>main</a></span>
 <span id="L327" class="LineNr">327 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L328" class="LineNr">328 </span><span class="traceContains">+transform: copy ...</span>
 <span id="L329" class="LineNr">329 </span>
@@ -395,12 +396,12 @@ if ('onhashchange' in window) {
 <span id="L334" class="LineNr">334 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">5</span>
 <span id="L335" class="LineNr">335 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
 <span id="L336" class="LineNr">336 </span>  <span class="Delimiter">{</span>
-<span id="L337" class="LineNr">337 </span>    <span class="Constant">3</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">1</span>
-<span id="L338" class="LineNr">338 </span>    <span class="Identifier">break</span>-<span class="Normal">if</span> <span class="Constant">3</span>:<span class="Normal">bool</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">1</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>-<span class="Normal">if</span> <span class="Constant">3</span>:<span class="Normal">bool</span>
 <span id="L339" class="LineNr">339 </span><span class="Comment">#    $print 1:num</span>
-<span id="L340" class="LineNr">340 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>multiply <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">1</span>:num
-<span id="L341" class="LineNr">341 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>subtract <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">1</span>
-<span id="L342" class="LineNr">342 </span>    loop
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>multiply <span class="Constant">2</span>:num<span class="Delimiter">,</span> <span class="Constant">1</span>:num
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>subtract <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">1</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span> loop
 <span id="L343" class="LineNr">343 </span>  <span class="Delimiter">}</span>
 <span id="L344" class="LineNr">344 </span>  <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>:num  <span class="Comment"># trigger a read</span>
 <span id="L345" class="LineNr">345 </span>]
@@ -417,7 +418,7 @@ if ('onhashchange' in window) {
 <span id="L356" class="LineNr">356 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L357" class="LineNr">357 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L358" class="LineNr">358 </span>  <span class="Delimiter">{</span>
-<span id="L359" class="LineNr">359 </span>    <span class="Identifier">break</span>-<span class="Normal">if</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>-<span class="Normal">if</span>
 <span id="L360" class="LineNr">360 </span>  <span class="Delimiter">}</span>
 <span id="L361" class="LineNr">361 </span>]
 <span id="L362" class="LineNr">362 </span><span class="traceContains">+error: 'break-if' expects 1 or 2 ingredients, but got none</span>
@@ -454,11 +455,11 @@ if ('onhashchange' in window) {
 <span id="L393" class="LineNr">393 </span><span class="Comment">//   ```</span>
 <span id="L394" class="LineNr">394 </span><span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;return-if&quot;</span> || curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply-if&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L395" class="LineNr">395 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L396" class="LineNr">396 </span>    <a href='040brace.cc.html#L421'>emit_return_block</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">,</span> curr<span class="Delimiter">);</span>
-<span id="L397" class="LineNr">397 </span>    curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span> <a href='040brace.cc.html#L421'>emit_return_block</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">,</span> curr<span class="Delimiter">);</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L398" class="LineNr">398 </span>  <span class="Delimiter">}</span>
 <span id="L399" class="LineNr">399 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L400" class="LineNr">400 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L401" class="LineNr">401 </span>  <span class="Delimiter">}</span>
 <span id="L402" class="LineNr">402 </span><span class="Delimiter">}</span>
 <span id="L403" class="LineNr">403 </span><span class="Comment">// rewrite `return-unless a, b, c, ...` to</span>
@@ -470,11 +471,11 @@ if ('onhashchange' in window) {
 <span id="L409" class="LineNr">409 </span><span class="Comment">//   ```</span>
 <span id="L410" class="LineNr">410 </span><span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;return-unless&quot;</span> || curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L411" class="LineNr">411 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L412" class="LineNr">412 </span>    <a href='040brace.cc.html#L421'>emit_return_block</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">&quot;break-if&quot;</span><span class="Delimiter">,</span> curr<span class="Delimiter">);</span>
-<span id="L413" class="LineNr">413 </span>    curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> <a href='040brace.cc.html#L421'>emit_return_block</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> <span class="Constant">&quot;break-if&quot;</span><span class="Delimiter">,</span> curr<span class="Delimiter">);</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L414" class="LineNr">414 </span>  <span class="Delimiter">}</span>
 <span id="L415" class="LineNr">415 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L416" class="LineNr">416 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' never yields any products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L417" class="LineNr">417 </span>  <span class="Delimiter">}</span>
 <span id="L418" class="LineNr">418 </span><span class="Delimiter">}</span>
 <span id="L419" class="LineNr">419 </span>
diff --git a/html/041jump_target.cc.html b/html/041jump_target.cc.html
index 12da93a5..456e497b 100644
--- a/html/041jump_target.cc.html
+++ b/html/041jump_target.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
+.muRecipe { color: #ff8700; }
 .traceAbsent { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .traceContains { color: #008000; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -94,64 +95,64 @@ if ('onhashchange' in window) {
 <span id="L32" class="LineNr"> 32 </span><span class="Normal">void</span> <a href='041jump_target.cc.html#L32'>transform_labels</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L33" class="LineNr"> 33 </span>  map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt; offset<span class="Delimiter">;</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L35" class="LineNr"> 35 </span>    <span class="Normal">const</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L36" class="LineNr"> 36 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L38" class="LineNr"> 38 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L39" class="LineNr"> 39 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
-<span id="L40" class="LineNr"> 40 </span>      <span class="Delimiter">}</span>
-<span id="L41" class="LineNr"> 41 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L42" class="LineNr"> 42 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;duplicate label '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>label &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L43" class="LineNr"> 43 </span>        <span class="Comment">// have all jumps skip some random but noticeable and deterministic amount of code</span>
-<span id="L44" class="LineNr"> 44 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> <span class="Constant">9999</span><span class="Delimiter">);</span>
-<span id="L45" class="LineNr"> 45 </span>      <span class="Delimiter">}</span>
-<span id="L46" class="LineNr"> 46 </span>    <span class="Delimiter">}</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;duplicate label '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>label &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// have all jumps skip some random but noticeable and deterministic amount of code</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>offset<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">,</span> <span class="Constant">9999</span><span class="Delimiter">);</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L49" class="LineNr"> 49 </span>    instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L50" class="LineNr"> 50 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L51" class="LineNr"> 51 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L52" class="LineNr"> 52 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump' expects an ingredient but got none</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L53" class="LineNr"> 53 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L54" class="LineNr"> 54 </span>      <span class="Delimiter">}</span>
-<span id="L55" class="LineNr"> 55 </span>      <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L56" class="LineNr"> 56 </span>    <span class="Delimiter">}</span>
-<span id="L57" class="LineNr"> 57 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump-if&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L58" class="LineNr"> 58 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L59" class="LineNr"> 59 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' expects 2 ingredients but got &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L60" class="LineNr"> 60 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L61" class="LineNr"> 61 </span>      <span class="Delimiter">}</span>
-<span id="L62" class="LineNr"> 62 </span>      <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Delimiter">}</span>
-<span id="L64" class="LineNr"> 64 </span>    <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;loop&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;break&quot;</span><span class="Delimiter">)</span>
-<span id="L65" class="LineNr"> 65 </span>        &amp;&amp; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>      <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Delimiter">}</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;loop-if&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;loop-unless&quot;</span>
-<span id="L69" class="LineNr"> 69 </span>            || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;break-if&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">)</span>
-<span id="L70" class="LineNr"> 70 </span>        &amp;&amp; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt;= <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>      <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Delimiter">}</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'jump' expects an ingredient but got none</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump-if&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;jump-unless&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' expects 2 ingredients but got &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;loop&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;break&quot;</span><span class="Delimiter">)</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt;= <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;loop-if&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;loop-unless&quot;</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;break-if&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;break-unless&quot;</span><span class="Delimiter">)</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt;= <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">),</span> offset<span class="Delimiter">,</span> i<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Delimiter">}</span>
 <span id="L74" class="LineNr"> 74 </span><span class="Delimiter">}</span>
 <span id="L75" class="LineNr"> 75 </span>
 <span id="L76" class="LineNr"> 76 </span><span class="Normal">void</span> <a href='041jump_target.cc.html#L76'>replace_offset</a><span class="Delimiter">(</span>reagent&amp; x<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;&amp; offset<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">int</span> current_offset<span class="Delimiter">,</span> <span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L77" class="LineNr"> 77 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L78" class="LineNr"> 78 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump target must be offset or label but is '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L79" class="LineNr"> 79 </span>    x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// no jump by default</span>
-<span id="L80" class="LineNr"> 80 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;jump target must be offset or label but is '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// no jump by default</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L81" class="LineNr"> 81 </span>  <span class="Delimiter">}</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// non-labels will be handled like other number operands</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_jump_target<span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L85" class="LineNr"> 85 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't jump to label '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L86" class="LineNr"> 86 </span>    x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// no jump by default</span>
-<span id="L87" class="LineNr"> 87 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't jump to label '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// no jump by default</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Delimiter">}</span>
 <span id="L89" class="LineNr"> 89 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't find label '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L91" class="LineNr"> 91 </span>    x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// no jump by default</span>
-<span id="L92" class="LineNr"> 92 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't find label '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// no jump by default</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L93" class="LineNr"> 93 </span>  <span class="Delimiter">}</span>
 <span id="L94" class="LineNr"> 94 </span>  x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>offset<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> - current_offset<span class="Delimiter">);</span>
 <span id="L95" class="LineNr"> 95 </span><span class="Delimiter">}</span>
@@ -159,10 +160,10 @@ if ('onhashchange' in window) {
 <span id="L97" class="LineNr"> 97 </span><span class="Delimiter">:(scenario break_to_label)</span>
 <span id="L98" class="LineNr"> 98 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L99" class="LineNr"> 99 </span>  <span class="Delimiter">{</span>
-<span id="L100" class="LineNr">100 </span>    <span class="Delimiter">{</span>
-<span id="L101" class="LineNr">101 </span>      <span class="Identifier">break</span> <span class="Constant">+target:label</span>
-<span id="L102" class="LineNr">102 </span>      <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Delimiter">}</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span> <span class="Constant">+target:label</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Delimiter">}</span>
 <span id="L105" class="LineNr">105 </span>  +target
 <span id="L106" class="LineNr">106 </span>]
@@ -171,10 +172,10 @@ if ('onhashchange' in window) {
 <span id="L109" class="LineNr">109 </span><span class="Delimiter">:(scenario jump_if_to_label)</span>
 <span id="L110" class="LineNr">110 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L111" class="LineNr">111 </span>  <span class="Delimiter">{</span>
-<span id="L112" class="LineNr">112 </span>    <span class="Delimiter">{</span>
-<span id="L113" class="LineNr">113 </span>      jump-<span class="Normal">if</span> <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">+target:label</span>
-<span id="L114" class="LineNr">114 </span>      <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Delimiter">}</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> jump-<span class="Normal">if</span> <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">+target:label</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Delimiter">}</span>
 <span id="L117" class="LineNr">117 </span>  +target
 <span id="L118" class="LineNr">118 </span>]
@@ -183,10 +184,10 @@ if ('onhashchange' in window) {
 <span id="L121" class="LineNr">121 </span><span class="Delimiter">:(scenario loop_unless_to_label)</span>
 <span id="L122" class="LineNr">122 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L123" class="LineNr">123 </span>  <span class="Delimiter">{</span>
-<span id="L124" class="LineNr">124 </span>    <span class="Delimiter">{</span>
-<span id="L125" class="LineNr">125 </span>      loop-unless <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">+target:label</span>  <span class="Comment"># loop/break with a label don't care about braces</span>
-<span id="L126" class="LineNr">126 </span>      <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Delimiter">}</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> loop-unless <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">+target:label</span>  <span class="Comment"># loop/break with a label don't care about braces</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L128" class="LineNr">128 </span>  <span class="Delimiter">}</span>
 <span id="L129" class="LineNr">129 </span>  +target
 <span id="L130" class="LineNr">130 </span>]
diff --git a/html/042name.cc.html b/html/042name.cc.html
index 9082f8a8..00e5267b 100644
--- a/html/042name.cc.html
+++ b/html/042name.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.traceAbsent { color: #c00000; }
-.Special { color: #c00000; }
+.SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.traceAbsent { color: #c00000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
-.SalientComment { color: #00ffff; }
 -->
 </style>
 
@@ -99,7 +100,7 @@ if ('onhashchange' in window) {
 <span id="L36" class="LineNr"> 36 </span><span class="Delimiter">:(code)</span>
 <span id="L37" class="LineNr"> 37 </span><span class="Normal">void</span> <a href='042name.cc.html#L37'>transform_names</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L38" class="LineNr"> 38 </span>  recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L39" class="LineNr"> 39 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- <a href='012transform.cc.html#L98'>transform</a> names for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L39" class="LineNr"> 39 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- <a href='012transform.cc.html#L99'>transform</a> names for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Normal">bool</span> names_used = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L41" class="LineNr"> 41 </span>  <span class="Normal">bool</span> numeric_locations_used = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L42" class="LineNr"> 42 </span>  map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;&amp; names = Name[r]<span class="Delimiter">;</span>
@@ -107,63 +108,63 @@ if ('onhashchange' in window) {
 <span id="L44" class="LineNr"> 44 </span>  <span class="Normal">int</span>&amp; curr_idx = names[<span class="Constant">&quot;&quot;</span>]<span class="Delimiter">;</span>
 <span id="L45" class="LineNr"> 45 </span>  ++curr_idx<span class="Delimiter">;</span>  <span class="Comment">// avoid using index 0, benign skip in some other cases</span>
 <span id="L46" class="LineNr"> 46 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L47" class="LineNr"> 47 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L48" class="LineNr"> 48 </span>    <span class="Comment">// End transform_names(inst) Special-cases</span>
-<span id="L49" class="LineNr"> 49 </span>    <span class="Comment">// map names to addresses</span>
-<span id="L50" class="LineNr"> 50 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L51" class="LineNr"> 51 </span>      reagent&amp; ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L52" class="LineNr"> 52 </span>      <span class="Comment">// Begin transform_names Ingredient Special-cases(ingredient, inst, caller)</span>
-<span id="L53" class="LineNr"> 53 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L99'>is_disqualified</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L54" class="LineNr"> 54 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L141'>is_numeric_location</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">))</span> numeric_locations_used = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L55" class="LineNr"> 55 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L148'>is_named_location</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">))</span> names_used = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L56" class="LineNr"> 56 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L57" class="LineNr"> 57 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!already_transformed<span class="Delimiter">(</span>ingredient<span class="Delimiter">,</span> names<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L58" class="LineNr"> 58 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;tried to read ingredient '&quot;</span> &lt;&lt; ingredient<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' but it hasn't been written to yet</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L59" class="LineNr"> 59 </span>        <span class="Comment">// use-before-set Error</span>
-<span id="L60" class="LineNr"> 60 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L61" class="LineNr"> 61 </span>      <span class="Delimiter">}</span>
-<span id="L62" class="LineNr"> 62 </span>      <span class="Normal">int</span> v = lookup_name<span class="Delimiter">(</span>ingredient<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L63" class="LineNr"> 63 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>v &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L64" class="LineNr"> 64 </span>        ingredient<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>v<span class="Delimiter">);</span>
-<span id="L65" class="LineNr"> 65 </span>        <span class="Comment">// Done Placing Ingredient(ingredient, inst, caller)</span>
-<span id="L66" class="LineNr"> 66 </span>      <span class="Delimiter">}</span>
-<span id="L67" class="LineNr"> 67 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L68" class="LineNr"> 68 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't find a place to store '&quot;</span> &lt;&lt; ingredient<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L69" class="LineNr"> 69 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L70" class="LineNr"> 70 </span>      <span class="Delimiter">}</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Delimiter">}</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L73" class="LineNr"> 73 </span>      reagent&amp; product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">);</span>
-<span id="L74" class="LineNr"> 74 </span>      <span class="Comment">// Begin transform_names Product Special-cases(product, inst, caller)</span>
-<span id="L75" class="LineNr"> 75 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L99'>is_disqualified</a><span class="Delimiter">(</span>product<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L76" class="LineNr"> 76 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L141'>is_numeric_location</a><span class="Delimiter">(</span>product<span class="Delimiter">))</span> numeric_locations_used = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L77" class="LineNr"> 77 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L148'>is_named_location</a><span class="Delimiter">(</span>product<span class="Delimiter">))</span> names_used = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L78" class="LineNr"> 78 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>product<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L79" class="LineNr"> 79 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>product<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L80" class="LineNr"> 80 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;assign &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; &quot;</span> &lt;&lt; curr_idx &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L81" class="LineNr"> 81 </span>        names[product<span class="Delimiter">.</span>name] = curr_idx<span class="Delimiter">;</span>
-<span id="L82" class="LineNr"> 82 </span>        curr_idx += size_of<span class="Delimiter">(</span>product<span class="Delimiter">);</span>
-<span id="L83" class="LineNr"> 83 </span>      <span class="Delimiter">}</span>
-<span id="L84" class="LineNr"> 84 </span>      <span class="Normal">int</span> v = lookup_name<span class="Delimiter">(</span>product<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
-<span id="L85" class="LineNr"> 85 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>v &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L86" class="LineNr"> 86 </span>        product<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>v<span class="Delimiter">);</span>
-<span id="L87" class="LineNr"> 87 </span>        <span class="Comment">// Done Placing Product(product, inst, caller)</span>
-<span id="L88" class="LineNr"> 88 </span>      <span class="Delimiter">}</span>
-<span id="L89" class="LineNr"> 89 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't find a place to store '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L91" class="LineNr"> 91 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L92" class="LineNr"> 92 </span>      <span class="Delimiter">}</span>
-<span id="L93" class="LineNr"> 93 </span>    <span class="Delimiter">}</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Comment">// End transform_names(inst) Special-cases</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Comment">// map names to addresses</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent&amp; ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Begin transform_names Ingredient Special-cases(ingredient, inst, caller)</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L99'>is_disqualified</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L141'>is_numeric_location</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">))</span> numeric_locations_used = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L148'>is_named_location</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">))</span> names_used = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!already_transformed<span class="Delimiter">(</span>ingredient<span class="Delimiter">,</span> names<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;tried to read ingredient '&quot;</span> &lt;&lt; ingredient<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' but it hasn't been written to yet</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// use-before-set Error</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> v = lookup_name<span class="Delimiter">(</span>ingredient<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>v &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ingredient<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>v<span class="Delimiter">);</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Done Placing Ingredient(ingredient, inst, caller)</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't find a place to store '&quot;</span> &lt;&lt; ingredient<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent&amp; product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">);</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Begin transform_names Product Special-cases(product, inst, caller)</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L99'>is_disqualified</a><span class="Delimiter">(</span>product<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L141'>is_numeric_location</a><span class="Delimiter">(</span>product<span class="Delimiter">))</span> numeric_locations_used = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L148'>is_named_location</a><span class="Delimiter">(</span>product<span class="Delimiter">))</span> names_used = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>product<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>product<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;assign &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; &quot;</span> &lt;&lt; curr_idx &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> names[product<span class="Delimiter">.</span>name] = curr_idx<span class="Delimiter">;</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_idx += size_of<span class="Delimiter">(</span>product<span class="Delimiter">);</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> v = lookup_name<span class="Delimiter">(</span>product<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>v &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> product<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>v<span class="Delimiter">);</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Done Placing Product(product, inst, caller)</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't find a place to store '&quot;</span> &lt;&lt; product<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Delimiter">}</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>names_used &amp;&amp; numeric_locations_used<span class="Delimiter">)</span>
-<span id="L96" class="LineNr"> 96 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;mixing variable names and numeric addresses</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;mixing variable names and numeric addresses</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L97" class="LineNr"> 97 </span><span class="Delimiter">}</span>
 <span id="L98" class="LineNr"> 98 </span>
 <span id="L99" class="LineNr"> 99 </span><span class="Normal">bool</span> <a href='042name.cc.html#L99'>is_disqualified</a><span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">mutable</span><span class="Comment">*/</span> reagent&amp; x<span class="Delimiter">,</span> <span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; recipe_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L100" class="LineNr">100 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L101" class="LineNr">101 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>recipe_name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;missing type for '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L102" class="LineNr">102 </span>    <span class="Comment">// missing-type Error 1</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>recipe_name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;missing type for '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Comment">// missing-type Error 1</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Delimiter">}</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='022arithmetic.cc.html#L108'>is_raw</a><span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L106" class="LineNr">106 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
@@ -182,13 +183,13 @@ if ('onhashchange' in window) {
 <span id="L119" class="LineNr">119 </span>
 <span id="L120" class="LineNr">120 </span><a href='010vm.cc.html#L123'>type_ordinal</a> <a href='042name.cc.html#L120'>skip_addresses</a><span class="Delimiter">(</span>type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>type &amp;&amp; <a href='039location_array.cc.html#L23'>is_compound_type_starting_with</a><span class="Delimiter">(</span>type<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">))</span>
-<span id="L122" class="LineNr">122 </span>    type = type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> type = type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
 <span id="L124" class="LineNr">124 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
 <span id="L125" class="LineNr">125 </span>  <span class="Normal">const</span> type_tree* base_type = type<span class="Delimiter">;</span>
 <span id="L126" class="LineNr">126 </span>  <span class="Comment">// Update base_type in skip_addresses</span>
 <span id="L127" class="LineNr">127 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L128" class="LineNr">128 </span>    <span class="Identifier">return</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
 <span id="L129" class="LineNr">129 </span>  assert<span class="Delimiter">(</span>base_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L130" class="LineNr">130 </span>  <span class="Identifier">return</span> base_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
 <span id="L131" class="LineNr">131 </span><span class="Delimiter">}</span>
@@ -196,7 +197,7 @@ if ('onhashchange' in window) {
 <span id="L133" class="LineNr">133 </span><span class="Normal">int</span> <a href='042name.cc.html#L133'>find_element_name</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L123'>type_ordinal</a> t<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; name<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; recipe_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Normal">const</span> type_info&amp; container = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> t<span class="Delimiter">);</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>container<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L136" class="LineNr">136 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>container<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == name<span class="Delimiter">)</span> <span class="Identifier">return</span> i<span class="Delimiter">;</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>container<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == name<span class="Delimiter">)</span> <span class="Identifier">return</span> i<span class="Delimiter">;</span>
 <span id="L137" class="LineNr">137 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>recipe_name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;unknown element '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' in container '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> t<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L139" class="LineNr">139 </span><span class="Delimiter">}</span>
@@ -295,8 +296,8 @@ if ('onhashchange' in window) {
 <span id="L232" class="LineNr">232 </span><span class="Delimiter">:(before &quot;End update GET offset_value in Check&quot;)</span>
 <span id="L233" class="LineNr">233 </span><span class="Normal">else</span> <span class="Delimiter">{</span>
 <span id="L234" class="LineNr">234 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!offset<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L235" class="LineNr">235 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;uninitialized offset '&quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L236" class="LineNr">236 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;uninitialized offset '&quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L237" class="LineNr">237 </span>  <span class="Delimiter">}</span>
 <span id="L238" class="LineNr">238 </span>  offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L239" class="LineNr">239 </span><span class="Delimiter">}</span>
@@ -317,16 +318,16 @@ if ('onhashchange' in window) {
 <span id="L254" class="LineNr">254 </span>  <span class="Comment">//: instructions with the same names (static dispatch), which could lead to</span>
 <span id="L255" class="LineNr">255 </span>  <span class="Comment">//: spurious errors</span>
 <span id="L256" class="LineNr">256 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &lt; <span class="Constant">2</span><span class="Delimiter">)</span>
-<span id="L257" class="LineNr">257 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// error raised elsewhere</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// error raised elsewhere</span>
 <span id="L258" class="LineNr">258 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span>
-<span id="L259" class="LineNr">259 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// error raised elsewhere</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// error raised elsewhere</span>
 <span id="L260" class="LineNr">260 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">.</span>find_first_not_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L261" class="LineNr">261 </span>    <span class="Comment">// since first non-address in base type must be a container, we don't have to canonize</span>
-<span id="L262" class="LineNr">262 </span>    <a href='010vm.cc.html#L123'>type_ordinal</a> base_type = <a href='042name.cc.html#L120'>skip_addresses</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L263" class="LineNr">263 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// otherwise we'll raise an error elsewhere</span>
-<span id="L264" class="LineNr">264 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='042name.cc.html#L133'>find_element_name</a><span class="Delimiter">(</span>base_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L265" class="LineNr">265 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;element &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; of type &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is at offset &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L266" class="LineNr">266 </span>    <span class="Delimiter">}</span>
+<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> <span class="Comment">// since first non-address in base type must be a container, we don't have to canonize</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> <a href='010vm.cc.html#L123'>type_ordinal</a> base_type = <a href='042name.cc.html#L120'>skip_addresses</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// otherwise we'll raise an error elsewhere</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='042name.cc.html#L133'>find_element_name</a><span class="Delimiter">(</span>base_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;element &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; of type &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is at offset &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L267" class="LineNr">267 </span>  <span class="Delimiter">}</span>
 <span id="L268" class="LineNr">268 </span><span class="Delimiter">}</span>
 <span id="L269" class="LineNr">269 </span>
@@ -366,17 +367,17 @@ if ('onhashchange' in window) {
 <span id="L303" class="LineNr">303 </span><span class="Comment">// convert variant names of exclusive containers</span>
 <span id="L304" class="LineNr">304 </span><span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;maybe-convert&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L305" class="LineNr">305 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L306" class="LineNr">306 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;exactly 2 ingredients expected in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L307" class="LineNr">307 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;exactly 2 ingredients expected in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L308" class="LineNr">308 </span>  <span class="Delimiter">}</span>
 <span id="L309" class="LineNr">309 </span>  assert<span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
 <span id="L310" class="LineNr">310 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">.</span>find_first_not_of<span class="Delimiter">(</span><span class="Constant">&quot;0123456789&quot;</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L311" class="LineNr">311 </span>    <span class="Comment">// since first non-address in base type must be an exclusive container, we don't have to canonize</span>
-<span id="L312" class="LineNr">312 </span>    <a href='010vm.cc.html#L123'>type_ordinal</a> base_type = <a href='042name.cc.html#L120'>skip_addresses</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L313" class="LineNr">313 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// otherwise we'll raise an error elsewhere</span>
-<span id="L314" class="LineNr">314 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='042name.cc.html#L133'>find_element_name</a><span class="Delimiter">(</span>base_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L315" class="LineNr">315 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;variant &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; of type &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; has tag &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L316" class="LineNr">316 </span>    <span class="Delimiter">}</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> <span class="Comment">// since first non-address in base type must be an exclusive container, we don't have to canonize</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <a href='010vm.cc.html#L123'>type_ordinal</a> base_type = <a href='042name.cc.html#L120'>skip_addresses</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// otherwise we'll raise an error elsewhere</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='042name.cc.html#L133'>find_element_name</a><span class="Delimiter">(</span>base_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;variant &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; of type &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; has tag &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>value<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Delimiter">}</span>
 <span id="L318" class="LineNr">318 </span><span class="Delimiter">}</span>
 <span id="L319" class="LineNr">319 </span>
diff --git a/html/043space.cc.html b/html/043space.cc.html
index d5a43d67..4f122dc0 100644
--- a/html/043space.cc.html
+++ b/html/043space.cc.html
@@ -17,13 +17,14 @@ a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
-.LineNr { color: #444444; }
 .muData { color: #ffff00; }
-.cSpecial { color: #008000; }
-.Delimiter { color: #800080; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.LineNr { color: #444444; }
 .traceContains { color: #008000; }
 .traceAbsent { color: #c00000; }
+.Delimiter { color: #800080; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .Special { color: #c00000; }
@@ -126,7 +127,7 @@ if ('onhashchange' in window) {
 <span id="L62" class="LineNr"> 62 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='022arithmetic.cc.html#L108'>is_raw</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> || is_dummy<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;default-space&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>initialized<span class="Delimiter">)</span>
-<span id="L65" class="LineNr"> 65 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;: reagent not initialized: '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;: reagent not initialized: '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L66" class="LineNr"> 66 </span>  x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>value<span class="Delimiter">,</span> space_base<span class="Delimiter">(</span>x<span class="Delimiter">)));</span>
 <span id="L67" class="LineNr"> 67 </span>  x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;raw&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
 <span id="L68" class="LineNr"> 68 </span>  assert<span class="Delimiter">(</span><a href='022arithmetic.cc.html#L108'>is_raw</a><span class="Delimiter">(</span>x<span class="Delimiter">));</span>
@@ -142,9 +143,9 @@ if ('onhashchange' in window) {
 <span id="L78" class="LineNr"> 78 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> offset<span class="Delimiter">;</span>  <span class="Comment">// raw</span>
 <span id="L79" class="LineNr"> 79 </span>  <span class="Normal">int</span> size = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base<span class="Delimiter">);</span>
 <span id="L80" class="LineNr"> 80 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>offset &gt;= size<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L81" class="LineNr"> 81 </span>    <span class="Comment">// todo: test</span>
-<span id="L82" class="LineNr"> 82 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; offset &lt;&lt; <span class="Constant">&quot; is out of bounds &quot;</span> &lt;&lt; size &lt;&lt; <span class="Constant">&quot; at &quot;</span> &lt;&lt; base &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L83" class="LineNr"> 83 </span>    <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Comment">// todo: test</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; offset &lt;&lt; <span class="Constant">&quot; is out of bounds &quot;</span> &lt;&lt; size &lt;&lt; <span class="Constant">&quot; at &quot;</span> &lt;&lt; base &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Delimiter">}</span>
 <span id="L85" class="LineNr"> 85 </span>  <span class="Identifier">return</span> base + <span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span> + offset<span class="Delimiter">;</span>
 <span id="L86" class="LineNr"> 86 </span><span class="Delimiter">}</span>
@@ -154,7 +155,7 @@ if ('onhashchange' in window) {
 <span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(after &quot;Begin Preprocess write_memory(x, data)&quot;)</span>
 <span id="L91" class="LineNr"> 91 </span><span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;default-space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L92" class="LineNr"> 92 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>data<span class="Delimiter">)</span> || !is_space<span class="Delimiter">(</span>x<span class="Delimiter">))</span>
-<span id="L93" class="LineNr"> 93 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'default-space' should be of type <a href='043space.cc.html#L76'>address</a>:array:location, but is &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'default-space' should be of type <a href='043space.cc.html#L76'>address</a>:array:location, but is &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L94" class="LineNr"> 94 </span>  current_call<span class="Delimiter">().</span>default_space = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L96" class="LineNr"> 96 </span><span class="Delimiter">}</span>
@@ -248,7 +249,7 @@ if ('onhashchange' in window) {
 <span id="L184" class="LineNr">184 </span>  vector&lt;<span class="Normal">double</span>&gt; result<span class="Delimiter">;</span>
 <span id="L185" class="LineNr">185 </span>  result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>Name[get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> current_recipe_name<span class="Delimiter">())</span>][<span class="Constant">&quot;&quot;</span>]<span class="Delimiter">);</span>
 <span id="L186" class="LineNr">186 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">0</span><span class="Delimiter">)</span>
-<span id="L187" class="LineNr">187 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;no space allocated for default-space in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;; are you using names?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;no space allocated for default-space in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;; are you using names?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L188" class="LineNr">188 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L189" class="LineNr">189 </span><span class="Delimiter">}</span>
 <span id="L190" class="LineNr">190 </span><span class="Delimiter">:(after &quot;Begin Preprocess write_memory(x, data)&quot;)</span>
@@ -303,23 +304,23 @@ if ('onhashchange' in window) {
 <span id="L239" class="LineNr">239 </span>  <span class="Comment">// reclaim any local variables unless they're being returned</span>
 <span id="L240" class="LineNr">240 </span>  vector&lt;<span class="Normal">double</span>&gt; zeros<span class="Delimiter">;</span>
 <span id="L241" class="LineNr">241 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">leave default space for last</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>exiting_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L242" class="LineNr">242 </span>    <span class="Normal">const</span> instruction&amp; inst = exiting_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L243" class="LineNr">243 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L244" class="LineNr">244 </span>      <span class="Normal">const</span> reagent&amp; product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L245" class="LineNr">245 </span>      <span class="Comment">// local variables only</span>
-<span id="L246" class="LineNr">246 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L247" class="LineNr">247 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;raw&quot;</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// tests often want to check such locations after they run</span>
-<span id="L248" class="LineNr">248 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='043space.cc.html#L273'>escaping</a><span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L249" class="LineNr">249 </span>      <span class="Comment">// End Checks For Reclaiming Locals</span>
-<span id="L250" class="LineNr">250 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;clearing &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L251" class="LineNr">251 </span>      zeros<span class="Delimiter">.</span>resize<span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>product<span class="Delimiter">));</span>
-<span id="L252" class="LineNr">252 </span>      write_memory<span class="Delimiter">(</span>product<span class="Delimiter">,</span> zeros<span class="Delimiter">);</span>
-<span id="L253" class="LineNr">253 </span>    <span class="Delimiter">}</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = exiting_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// local variables only</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>product<span class="Delimiter">,</span> <span class="Constant">&quot;raw&quot;</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// tests often want to check such locations after they run</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='043space.cc.html#L273'>escaping</a><span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Checks For Reclaiming Locals</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;clearing &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> zeros<span class="Delimiter">.</span>resize<span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>product<span class="Delimiter">));</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> write_memory<span class="Delimiter">(</span>product<span class="Delimiter">,</span> zeros<span class="Delimiter">);</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L254" class="LineNr">254 </span>  <span class="Delimiter">}</span>
 <span id="L255" class="LineNr">255 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;automatically abandoning &quot;</span> &lt;&lt; current_call<span class="Delimiter">().</span>default_space &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L256" class="LineNr">256 </span>  <a href='037abandon.cc.html#L28'>abandon</a><span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>default_space<span class="Delimiter">,</span>
-<span id="L257" class="LineNr">257 </span>          inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span>
-<span id="L258" class="LineNr">258 </span>          <span class="Comment">/*</span><span class="Comment">refcount</span><span class="Comment">*/</span><span class="Constant">1</span> + <span class="Comment">/*</span><span class="Comment">array length</span><span class="Comment">*/</span><span class="Constant">1</span> + <span class="Comment">/*</span><span class="Comment">number-of-locals</span><span class="Comment">*/</span>Name[r][<span class="Constant">&quot;&quot;</span>]<span class="Delimiter">);</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">/*</span><span class="Comment">refcount</span><span class="Comment">*/</span><span class="Constant">1</span> + <span class="Comment">/*</span><span class="Comment">array length</span><span class="Comment">*/</span><span class="Constant">1</span> + <span class="Comment">/*</span><span class="Comment">number-of-locals</span><span class="Comment">*/</span>Name[r][<span class="Constant">&quot;&quot;</span>]<span class="Delimiter">);</span>
 <span id="L259" class="LineNr">259 </span><span class="Delimiter">}</span>
 <span id="L260" class="LineNr">260 </span>
 <span id="L261" class="LineNr">261 </span><span class="Comment">//: Reclaiming local variables above requires remembering what name an</span>
@@ -339,10 +340,10 @@ if ('onhashchange' in window) {
 <span id="L275" class="LineNr">275 </span>  <span class="Comment">// nothing escapes when you fall through past end of recipe</span>
 <span id="L276" class="LineNr">276 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>current_step_index<span class="Delimiter">()</span> &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>steps<span class="Delimiter">()))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L277" class="LineNr">277 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L278" class="LineNr">278 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>r == current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L279" class="LineNr">279 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='043space.cc.html#L304'>caller_uses_product</a><span class="Delimiter">(</span>i<span class="Delimiter">))</span>
-<span id="L280" class="LineNr">280 </span>        <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L281" class="LineNr">281 </span>    <span class="Delimiter">}</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r == current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='043space.cc.html#L304'>caller_uses_product</a><span class="Delimiter">(</span>i<span class="Delimiter">))</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L282" class="LineNr">282 </span>  <span class="Delimiter">}</span>
 <span id="L283" class="LineNr">283 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L284" class="LineNr">284 </span><span class="Delimiter">}</span>
@@ -377,12 +378,12 @@ if ('onhashchange' in window) {
 <span id="L313" class="LineNr">313 </span>
 <span id="L314" class="LineNr">314 </span><span class="Normal">void</span> <a href='043space.cc.html#L314'>rewrite_default_space_instruction</a><span class="Delimiter">(</span>instruction&amp; curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L316" class="LineNr">316 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; to_original_string<span class="Delimiter">(</span>curr<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; can't take any ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; to_original_string<span class="Delimiter">(</span>curr<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; can't take any ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L317" class="LineNr">317 </span>  curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;new&quot;</span><span class="Delimiter">;</span>
 <span id="L318" class="LineNr">318 </span>  <span class="Constant">curr.ingredients.push_back(reagent(&quot;location:type</span><span class="Constant">&quot;));</span>
 <span id="L319" class="LineNr">319 </span>  <span class="Constant">curr.ingredients.push_back(reagent(&quot;number-of-locals:literal</span><span class="Constant">&quot;));</span>
 <span id="L320" class="LineNr">320 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L321" class="LineNr">321 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;new-default-space can't take any results</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;new-default-space can't take any results</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L322" class="LineNr">322 </span>  curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;default-space:space&quot;</span><span class="Delimiter">));</span>
 <span id="L323" class="LineNr">323 </span><span class="Delimiter">}</span>
 <span id="L324" class="LineNr">324 </span>
@@ -469,8 +470,8 @@ if ('onhashchange' in window) {
 <span id="L405" class="LineNr">405 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- check that <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; sets default-space&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L406" class="LineNr">406 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L407" class="LineNr">407 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">()</span>
-<span id="L408" class="LineNr">408 </span>      || caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name != <span class="Constant">&quot;default-space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L409" class="LineNr">409 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; does not seem to start with 'local-scope' or 'default-space'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> || caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name != <span class="Constant">&quot;default-space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; does not seem to start with 'local-scope' or 'default-space'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L410" class="LineNr">410 </span>  <span class="Delimiter">}</span>
 <span id="L411" class="LineNr">411 </span><span class="Delimiter">}</span>
 <span id="L412" class="LineNr">412 </span><span class="Delimiter">:(after &quot;Load Mu Prelude&quot;)</span>
@@ -483,10 +484,10 @@ if ('onhashchange' in window) {
 <span id="L419" class="LineNr">419 </span><span class="Delimiter">:(code)</span>
 <span id="L420" class="LineNr">420 </span><span class="Normal">bool</span> contains_non_special_name<span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L421" class="LineNr">421 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;::iterator p = Name[r]<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Name[r]<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L422" class="LineNr">422 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L423" class="LineNr">423 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;stash_&quot;</span><span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// generated by rewrite_stashes_to_text (cross-layer)</span>
-<span id="L424" class="LineNr">424 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_special_name<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
-<span id="L425" class="LineNr">425 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;stash_&quot;</span><span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// generated by rewrite_stashes_to_text (cross-layer)</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_special_name<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L426" class="LineNr">426 </span>  <span class="Delimiter">}</span>
 <span id="L427" class="LineNr">427 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L428" class="LineNr">428 </span><span class="Delimiter">}</span>
diff --git a/html/044space_surround.cc.html b/html/044space_surround.cc.html
index 1d951dce..a6d7f82e 100644
--- a/html/044space_surround.cc.html
+++ b/html/044space_surround.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -105,18 +106,18 @@ if ('onhashchange' in window) {
 <span id="L44" class="LineNr">44 </span>
 <span id="L45" class="LineNr">45 </span><span class="Normal">int</span> space_base<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">,</span> <span class="Normal">int</span> <a href='044space_surround.cc.html#L52'>space_index</a><span class="Delimiter">,</span> <span class="Normal">int</span> base<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L46" class="LineNr">46 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='044space_surround.cc.html#L52'>space_index</a> == <span class="Constant">0</span><span class="Delimiter">)</span>
-<span id="L47" class="LineNr">47 </span>    <span class="Identifier">return</span> base<span class="Delimiter">;</span>
+<span id="L47" class="LineNr">47 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> base<span class="Delimiter">;</span>
 <span id="L48" class="LineNr">48 </span>  <span class="Normal">int</span> result = space_base<span class="Delimiter">(</span>x<span class="Delimiter">,</span> space_index-<span class="Constant">1</span><span class="Delimiter">,</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> base+<span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">))</span>+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L49" class="LineNr">49 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L50" class="LineNr">50 </span><span class="Delimiter">}</span>
 <span id="L51" class="LineNr">51 </span>
 <span id="L52" class="LineNr">52 </span><span class="Normal">int</span> <a href='044space_surround.cc.html#L52'>space_index</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L53" class="LineNr">53 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L54" class="LineNr">54 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">&quot;space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L55" class="LineNr">55 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second || x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
-<span id="L56" class="LineNr">56 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;/space metadata should take exactly one value in '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L57" class="LineNr">57 </span>      <span class="Identifier">return</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
-<span id="L58" class="LineNr">58 </span>    <span class="Delimiter">}</span>
+<span id="L54" class="LineNr">54 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>first == <span class="Constant">&quot;space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L55" class="LineNr">55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second || x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
+<span id="L56" class="LineNr">56 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;/space metadata should take exactly one value in '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L57" class="LineNr">57 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>second<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+<span id="L58" class="LineNr">58 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L59" class="LineNr">59 </span>  <span class="Delimiter">}</span>
 <span id="L60" class="LineNr">60 </span>  <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L61" class="LineNr">61 </span><span class="Delimiter">}</span>
diff --git a/html/045closure_name.cc.html b/html/045closure_name.cc.html
index b54d3153..b400cdd3 100644
--- a/html/045closure_name.cc.html
+++ b/html/045closure_name.cc.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
 .Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.traceContains { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.cSpecial { color: #008000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.cSpecial { color: #008000; }
+.Constant { color: #00a0a0; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -100,38 +101,38 @@ if ('onhashchange' in window) {
 <span id="L39" class="LineNr"> 39 </span><span class="Normal">void</span> <a href='045closure_name.cc.html#L39'>collect_surrounding_spaces</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L40" class="LineNr"> 40 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- collect surrounding spaces for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L41" class="LineNr"> 41 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L42" class="LineNr"> 42 </span>    <span class="Normal">const</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L44" class="LineNr"> 44 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L45" class="LineNr"> 45 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L46" class="LineNr"> 46 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">).</span>name != <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L47" class="LineNr"> 47 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!is_space<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L48" class="LineNr"> 48 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 should always have type <a href='043space.cc.html#L76'>address</a>:array:location, but is '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L49" class="LineNr"> 49 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L50" class="LineNr"> 50 </span>      <span class="Delimiter">}</span>
-<span id="L51" class="LineNr"> 51 </span>      string_tree* s = property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> <span class="Constant">&quot;names&quot;</span><span class="Delimiter">);</span>
-<span id="L52" class="LineNr"> 52 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L53" class="LineNr"> 53 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 requires a /names property in <a href='010vm.cc.html#L19'>recipe</a> '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L54" class="LineNr"> 54 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L55" class="LineNr"> 55 </span>      <span class="Delimiter">}</span>
-<span id="L56" class="LineNr"> 56 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 should have a single value in /names, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L57" class="LineNr"> 57 </span>      <span class="Normal">const</span> string&amp; surrounding_recipe_name = s<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
-<span id="L58" class="LineNr"> 58 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>surrounding_recipe_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L59" class="LineNr"> 59 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 doesn't initialize its /names property in recipe '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L60" class="LineNr"> 60 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L61" class="LineNr"> 61 </span>      <span class="Delimiter">}</span>
-<span id="L62" class="LineNr"> 62 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)</span>
-<span id="L63" class="LineNr"> 63 </span>          &amp;&amp; get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)</span> != get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L64" class="LineNr"> 64 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;recipe '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' can have only one 'surrounding' <a href='010vm.cc.html#L19'>recipe</a> but has '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)).</span>name &lt;&lt; <span class="Constant">&quot;' and '&quot;</span> &lt;&lt; surrounding_recipe_name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L65" class="LineNr"> 65 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L66" class="LineNr"> 66 </span>      <span class="Delimiter">}</span>
-<span id="L67" class="LineNr"> 67 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;lexically surrounding space for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; comes from &quot;</span> &lt;&lt; surrounding_recipe_name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L68" class="LineNr"> 68 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr"> 69 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't find recipe providing surrounding space for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'; looking for '&quot;</span> &lt;&lt; surrounding_recipe_name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L71" class="LineNr"> 71 </span>      <span class="Delimiter">}</span>
-<span id="L72" class="LineNr"> 72 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">));</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="Delimiter">}</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">).</span>name != <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_space<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 should always have type <a href='043space.cc.html#L76'>address</a>:array:location, but is '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> string_tree* s = property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> <span class="Constant">&quot;names&quot;</span><span class="Delimiter">);</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 requires a /names property in <a href='010vm.cc.html#L19'>recipe</a> '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!s<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 should have a single value in /names, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> string&amp; surrounding_recipe_name = s<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>surrounding_recipe_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;slot 0 doesn't initialize its /names property in recipe '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)</span> != get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;recipe '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' can have only one 'surrounding' <a href='010vm.cc.html#L19'>recipe</a> but has '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">)).</span>name &lt;&lt; <span class="Constant">&quot;' and '&quot;</span> &lt;&lt; surrounding_recipe_name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;name&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;lexically surrounding space for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; comes from &quot;</span> &lt;&lt; surrounding_recipe_name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't find recipe providing surrounding space for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'; looking for '&quot;</span> &lt;&lt; surrounding_recipe_name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> surrounding_recipe_name<span class="Delimiter">));</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L74" class="LineNr"> 74 </span>  <span class="Delimiter">}</span>
 <span id="L75" class="LineNr"> 75 </span><span class="Delimiter">}</span>
 <span id="L76" class="LineNr"> 76 </span>
@@ -141,8 +142,8 @@ if ('onhashchange' in window) {
 <span id="L80" class="LineNr"> 80 </span><span class="Delimiter">:(replace{} &quot;int lookup_name(const reagent&amp; r, const <a href='010vm.cc.html#L14'>recipe_ordinal</a> default_recipe)&quot;)</span>
 <span id="L81" class="LineNr"> 81 </span><span class="Normal">int</span> lookup_name<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">,</span> <span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> default_recipe<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">&quot;space&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L83" class="LineNr"> 83 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Name[default_recipe]<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;name not found: &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L84" class="LineNr"> 84 </span>    <span class="Identifier">return</span> Name[default_recipe][x<span class="Delimiter">.</span>name]<span class="Delimiter">;</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Name[default_recipe]<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;name not found: &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> Name[default_recipe][x<span class="Delimiter">.</span>name]<span class="Delimiter">;</span>
 <span id="L85" class="LineNr"> 85 </span>  <span class="Delimiter">}</span>
 <span id="L86" class="LineNr"> 86 </span>  string_tree* p = property<span class="Delimiter">(</span>x<span class="Delimiter">,</span> <span class="Constant">&quot;space&quot;</span><span class="Delimiter">);</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!p || !p<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;/space property should have exactly one (non-negative integer) value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -160,12 +161,12 @@ if ('onhashchange' in window) {
 <span id="L99" class="LineNr"> 99 </span><span class="Normal">int</span> lookup_name<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; x<span class="Delimiter">,</span> <span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">,</span> set&lt;recipe_ordinal&gt;&amp; done<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; path<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L100" class="LineNr">100 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Name[r]<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> Name[r][x<span class="Delimiter">.</span>name]<span class="Delimiter">;</span>
 <span id="L101" class="LineNr">101 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>done<span class="Delimiter">,</span> r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L102" class="LineNr">102 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't compute address of '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' because</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>path<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L104" class="LineNr">104 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; requires computing names of &quot;</span> &lt;&lt; path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L105" class="LineNr">105 </span>    <span class="Delimiter">}</span>
-<span id="L106" class="LineNr">106 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; path<span class="Delimiter">.</span>at<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>path<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; requires computing names of &quot;</span> &lt;&lt; r &lt;&lt; <span class="Constant">&quot;..ad infinitum</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L107" class="LineNr">107 </span>    <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't compute address of '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' because</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>path<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Constant">1</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; requires computing names of &quot;</span> &lt;&lt; path<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; path<span class="Delimiter">.</span>at<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>path<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; requires computing names of &quot;</span> &lt;&lt; r &lt;&lt; <span class="Constant">&quot;..ad infinitum</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L108" class="LineNr">108 </span>  <span class="Delimiter">}</span>
 <span id="L109" class="LineNr">109 </span>  done<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
 <span id="L110" class="LineNr">110 </span>  path<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
@@ -177,8 +178,8 @@ if ('onhashchange' in window) {
 <span id="L116" class="LineNr">116 </span><a href='010vm.cc.html#L14'>recipe_ordinal</a> <a href='045closure_name.cc.html#L116'>lookup_surrounding_recipe</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">,</span> <span class="Normal">int</span> n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>n == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> r<span class="Delimiter">;</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;don't know surrounding recipe of '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;don't know surrounding recipe of '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">));</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Identifier">return</span> <a href='045closure_name.cc.html#L116'>lookup_surrounding_recipe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Surrounding_space<span class="Delimiter">,</span> r<span class="Delimiter">),</span> n-<span class="Constant">1</span><span class="Delimiter">);</span>
@@ -188,12 +189,12 @@ if ('onhashchange' in window) {
 <span id="L127" class="LineNr">127 </span><span class="Delimiter">:(replace{} &quot;bool already_transformed(const reagent&amp; r, const map&lt;string, int&gt;&amp; names)&quot;)</span>
 <span id="L128" class="LineNr">128 </span><span class="Normal">bool</span> already_transformed<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; r<span class="Delimiter">,</span> <span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">int</span>&gt;&amp; names<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L129" class="LineNr">129 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;space&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L130" class="LineNr">130 </span>    string_tree* p = property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;space&quot;</span><span class="Delimiter">);</span>
-<span id="L131" class="LineNr">131 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!p || !p<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L132" class="LineNr">132 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;/space property should have exactly one (non-negative integer) value in '&quot;</span> &lt;&lt; r<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L133" class="LineNr">133 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L134" class="LineNr">134 </span>    <span class="Delimiter">}</span>
-<span id="L135" class="LineNr">135 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>value != <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> string_tree* p = property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;space&quot;</span><span class="Delimiter">);</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!p || !p<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;/space property should have exactly one (non-negative integer) value in '&quot;</span> &lt;&lt; r<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>value != <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Delimiter">}</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Identifier">return</span> contains_key<span class="Delimiter">(</span>names<span class="Delimiter">,</span> r<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
 <span id="L138" class="LineNr">138 </span><span class="Delimiter">}</span>
diff --git a/html/046global.cc.html b/html/046global.cc.html
index 2c71bbfb..000b647a 100644
--- a/html/046global.cc.html
+++ b/html/046global.cc.html
@@ -16,15 +16,16 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -104,9 +105,9 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr">43 </span><span class="Delimiter">:(after &quot;Begin Preprocess write_memory(x, data)&quot;)</span>
 <span id="L44" class="LineNr">44 </span><span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>name == <span class="Constant">&quot;global-space&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L45" class="LineNr">45 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>data<span class="Delimiter">)</span> || !is_space<span class="Delimiter">(</span>x<span class="Delimiter">))</span>
-<span id="L46" class="LineNr">46 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'global-space' should be of type <a href='043space.cc.html#L76'>address</a>:array:location, but tried to write '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'global-space' should be of type <a href='043space.cc.html#L76'>address</a>:array:location, but tried to write '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L47" class="LineNr">47 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
-<span id="L48" class="LineNr">48 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;routine already has a global-space; you can't over-write your globals&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L48" class="LineNr">48 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;routine already has a global-space; you can't over-write your globals&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L49" class="LineNr">49 </span>  Current_routine<span class="Delimiter">-&gt;</span>global_space = data<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L50" class="LineNr">50 </span>  <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L51" class="LineNr">51 </span><span class="Delimiter">}</span>
@@ -114,9 +115,9 @@ if ('onhashchange' in window) {
 <span id="L53" class="LineNr">53 </span><span class="Comment">//: now marking variables as /space:global looks them up inside this field</span>
 <span id="L54" class="LineNr">54 </span><span class="Delimiter">:(after &quot;int space_base(const reagent&amp; x)&quot;)</span>
 <span id="L55" class="LineNr">55 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='046global.cc.html#L79'>is_global</a><span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L56" class="LineNr">56 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
-<span id="L57" class="LineNr">57 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;routine has no global space</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L58" class="LineNr">58 </span>    <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>global_space + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L56" class="LineNr">56 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>global_space<span class="Delimiter">)</span>
+<span id="L57" class="LineNr">57 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;routine has no global space</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L58" class="LineNr">58 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>global_space + <span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L59" class="LineNr">59 </span>  <span class="Delimiter">}</span>
 <span id="L60" class="LineNr">60 </span>
 <span id="L61" class="LineNr">61 </span><span class="Comment">//: for now let's not bother giving global variables names.</span>
diff --git a/html/047check_type_by_name.cc.html b/html/047check_type_by_name.cc.html
index c5c1f057..0aec2954 100644
--- a/html/047check_type_by_name.cc.html
+++ b/html/047check_type_by_name.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.traceAbsent { color: #c00000; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
+.traceAbsent { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -85,23 +86,23 @@ if ('onhashchange' in window) {
 <span id="L23" class="LineNr"> 23 </span>  recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L24" class="LineNr"> 24 </span>  set&lt;reagent&gt; known<span class="Delimiter">;</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L26" class="LineNr"> 26 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L28" class="LineNr"> 28 </span>      <a href='047check_type_by_name.cc.html#L38'>deduce_missing_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L29" class="LineNr"> 29 </span>      <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">),</span> caller<span class="Delimiter">);</span>
-<span id="L30" class="LineNr"> 30 </span>    <span class="Delimiter">}</span>
-<span id="L31" class="LineNr"> 31 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L32" class="LineNr"> 32 </span>      <a href='047check_type_by_name.cc.html#L38'>deduce_missing_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">));</span>
-<span id="L33" class="LineNr"> 33 </span>      <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">),</span> caller<span class="Delimiter">);</span>
-<span id="L34" class="LineNr"> 34 </span>    <span class="Delimiter">}</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='047check_type_by_name.cc.html#L38'>deduce_missing_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">),</span> caller<span class="Delimiter">);</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='047check_type_by_name.cc.html#L38'>deduce_missing_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">));</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span>known<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">),</span> caller<span class="Delimiter">);</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Delimiter">}</span>
 <span id="L36" class="LineNr"> 36 </span><span class="Delimiter">}</span>
 <span id="L37" class="LineNr"> 37 </span>
 <span id="L38" class="LineNr"> 38 </span><span class="Normal">void</span> <a href='047check_type_by_name.cc.html#L38'>deduce_missing_type</a><span class="Delimiter">(</span>set&lt;reagent&gt;&amp; known<span class="Delimiter">,</span> reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L41" class="LineNr"> 41 </span>    x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;label&quot;</span><span class="Delimiter">);</span>
-<span id="L42" class="LineNr"> 42 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;label&quot;</span><span class="Delimiter">);</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L43" class="LineNr"> 43 </span>  <span class="Delimiter">}</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>known<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">)</span> == known<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L45" class="LineNr"> 45 </span>  x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*known<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">)-&gt;</span>type<span class="Delimiter">);</span>
@@ -113,27 +114,27 @@ if ('onhashchange' in window) {
 <span id="L51" class="LineNr"> 51 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// if you use raw locations you're probably doing something unsafe</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// might get filled in by other logic later</span>
 <span id="L53" class="LineNr"> 53 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L54" class="LineNr"> 54 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;label&quot;</span><span class="Delimiter">)</span>
-<span id="L55" class="LineNr"> 55 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;non-label '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' must begin with a letter</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L56" class="LineNr"> 56 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom || x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;label&quot;</span><span class="Delimiter">)</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;non-label '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' must begin with a letter</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L57" class="LineNr"> 57 </span>  <span class="Delimiter">}</span>
 <span id="L58" class="LineNr"> 58 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>known<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">)</span> == known<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L59" class="LineNr"> 59 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; =&gt; &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L60" class="LineNr"> 60 </span>    known<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; =&gt; &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> known<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Delimiter">}</span>
 <span id="L62" class="LineNr"> 62 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>known<span class="Delimiter">.</span>find<span class="Delimiter">(</span>x<span class="Delimiter">)-&gt;</span>type<span class="Delimiter">,</span> x<span class="Delimiter">.</span>type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L63" class="LineNr"> 63 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' used with multiple types</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L64" class="LineNr"> 64 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' used with multiple types</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Delimiter">}</span>
 <span id="L66" class="LineNr"> 66 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>x<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L68" class="LineNr"> 68 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: can't be just an array. What is it an array of?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L69" class="LineNr"> 69 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L70" class="LineNr"> 70 </span>    <span class="Delimiter">}</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L72" class="LineNr"> 72 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; can't determine the size of array variable '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'. Either allocate it separately and make the type of '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' an address, or specify the length of the array in the type of '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L73" class="LineNr"> 73 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L74" class="LineNr"> 74 </span>    <span class="Delimiter">}</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: can't be just an array. What is it an array of?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; can't determine the size of array variable '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'. Either allocate it separately and make the type of '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' an address, or specify the length of the array in the type of '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Delimiter">}</span>
 <span id="L76" class="LineNr"> 76 </span><span class="Delimiter">}</span>
 <span id="L77" class="LineNr"> 77 </span>
diff --git a/html/050scenario.cc.html b/html/050scenario.cc.html
index ac47b8a0..5a6caf90 100644
--- a/html/050scenario.cc.html
+++ b/html/050scenario.cc.html
@@ -21,10 +21,11 @@ a:hover { text-decoration: underline; }
 .muScenario { color: #00af00; }
 .LineNr { color: #444444; }
 .cSpecial { color: #008000; }
+.traceAbsent { color: #c00000; }
 .Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .traceContains { color: #008000; }
-.traceAbsent { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .Special { color: #c00000; }
@@ -72,10 +73,10 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr">  7 </span><span class="Delimiter">:(scenario scenario_block)</span>
 <span id="L8" class="LineNr">  8 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> foo [
 <span id="L9" class="LineNr">  9 </span>  run [
-<span id="L10" class="LineNr"> 10 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
 <span id="L11" class="LineNr"> 11 </span>  ]
 <span id="L12" class="LineNr"> 12 </span>  memory-should-contain [
-<span id="L13" class="LineNr"> 13 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
 <span id="L14" class="LineNr"> 14 </span>  ]
 <span id="L15" class="LineNr"> 15 </span>]
 <span id="L16" class="LineNr"> 16 </span><span class="Comment"># checks are inside scenario</span>
@@ -83,17 +84,17 @@ if ('onhashchange' in window) {
 <span id="L18" class="LineNr"> 18 </span><span class="Delimiter">:(scenario scenario_multiple_blocks)</span>
 <span id="L19" class="LineNr"> 19 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> foo [
 <span id="L20" class="LineNr"> 20 </span>  run [
-<span id="L21" class="LineNr"> 21 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
 <span id="L22" class="LineNr"> 22 </span>  ]
 <span id="L23" class="LineNr"> 23 </span>  memory-should-contain [
-<span id="L24" class="LineNr"> 24 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
 <span id="L25" class="LineNr"> 25 </span>  ]
 <span id="L26" class="LineNr"> 26 </span>  run [
-<span id="L27" class="LineNr"> 27 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
 <span id="L28" class="LineNr"> 28 </span>  ]
 <span id="L29" class="LineNr"> 29 </span>  memory-should-contain [
-<span id="L30" class="LineNr"> 30 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
-<span id="L31" class="LineNr"> 31 </span>    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
 <span id="L32" class="LineNr"> 32 </span>  ]
 <span id="L33" class="LineNr"> 33 </span>]
 <span id="L34" class="LineNr"> 34 </span><span class="Comment"># checks are inside scenario</span>
@@ -101,17 +102,17 @@ if ('onhashchange' in window) {
 <span id="L36" class="LineNr"> 36 </span><span class="Delimiter">:(scenario scenario_check_memory_and_trace)</span>
 <span id="L37" class="LineNr"> 37 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> foo [
 <span id="L38" class="LineNr"> 38 </span>  run [
-<span id="L39" class="LineNr"> 39 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
-<span id="L40" class="LineNr"> 40 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [a b c]
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [a b c]
 <span id="L41" class="LineNr"> 41 </span>  ]
 <span id="L42" class="LineNr"> 42 </span>  memory-should-contain [
-<span id="L43" class="LineNr"> 43 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
 <span id="L44" class="LineNr"> 44 </span>  ]
 <span id="L45" class="LineNr"> 45 </span>  trace-should-contain [
-<span id="L46" class="LineNr"> 46 </span>    <span class="Normal">a</span>: a b c
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: a b c
 <span id="L47" class="LineNr"> 47 </span>  ]
 <span id="L48" class="LineNr"> 48 </span>  trace-should-<span class="Normal">not</span>-contain [
-<span id="L49" class="LineNr"> 49 </span>    <span class="Normal">a</span>: x y z
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: x y z
 <span id="L50" class="LineNr"> 50 </span>  ]
 <span id="L51" class="LineNr"> 51 </span>]
 <span id="L52" class="LineNr"> 52 </span><span class="Comment"># checks are inside scenario</span>
@@ -123,8 +124,8 @@ if ('onhashchange' in window) {
 <span id="L58" class="LineNr"> 58 </span>  string name<span class="Delimiter">;</span>
 <span id="L59" class="LineNr"> 59 </span>  string to_run<span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Normal">void</span> <a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L61" class="LineNr"> 61 </span>    name<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
-<span id="L62" class="LineNr"> 62 </span>    to_run<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> name<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> to_run<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Delimiter">}</span>
 <span id="L64" class="LineNr"> 64 </span><span class="Delimiter">};</span>
 <span id="L65" class="LineNr"> 65 </span>
@@ -145,7 +146,7 @@ if ('onhashchange' in window) {
 <span id="L80" class="LineNr"> 80 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;scenario&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L81" class="LineNr"> 81 </span>  <a href='050scenario.cc.html#L57'>scenario</a> result = <a href='050scenario.cc.html#L91'>parse_scenario</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!result<span class="Delimiter">.</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L83" class="LineNr"> 83 </span>    Scenarios<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> Scenarios<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
 <span id="L84" class="LineNr"> 84 </span><span class="Delimiter">}</span>
 <span id="L85" class="LineNr"> 85 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;pending-scenario&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Comment">// for temporary use only</span>
@@ -157,32 +158,32 @@ if ('onhashchange' in window) {
 <span id="L92" class="LineNr"> 92 </span>  <a href='050scenario.cc.html#L57'>scenario</a> result<span class="Delimiter">;</span>
 <span id="L93" class="LineNr"> 93 </span>  result<span class="Delimiter">.</span>name = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Scenario_names<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
-<span id="L95" class="LineNr"> 95 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;duplicate <a href='050scenario.cc.html#L57'>scenario</a> name: '&quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;duplicate <a href='050scenario.cc.html#L57'>scenario</a> name: '&quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L96" class="LineNr"> 96 </span>  Scenario_names<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
 <span id="L97" class="LineNr"> 97 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L98" class="LineNr"> 98 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L99" class="LineNr"> 99 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='050scenario.cc.html#L57'>scenario</a> at <a href='003trace.cc.html#L185'>end</a> of file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L100" class="LineNr">100 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='050scenario.cc.html#L57'>scenario</a> at <a href='003trace.cc.html#L185'>end</a> of file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L101" class="LineNr">101 </span>  <span class="Delimiter">}</span>
 <span id="L102" class="LineNr">102 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L103" class="LineNr">103 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L104" class="LineNr">104 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Expected '[' after <a href='050scenario.cc.html#L57'>scenario</a> '&quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L105" class="LineNr">105 </span>    exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Expected '[' after <a href='050scenario.cc.html#L57'>scenario</a> '&quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L106" class="LineNr">106 </span>  <span class="Delimiter">}</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Comment">// scenarios are take special 'code' strings so we need to ignore brackets</span>
 <span id="L108" class="LineNr">108 </span>  <span class="Comment">// inside comments</span>
 <span id="L109" class="LineNr">109 </span>  result<span class="Delimiter">.</span>to_run = <a href='014literal_string.cc.html#L33'>slurp_quoted</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Comment">// delete [] delimiters</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>result<span class="Delimiter">.</span>to_run<span class="Delimiter">,</span> <span class="Constant">&quot;[&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L112" class="LineNr">112 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;scenario &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; should start with '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L113" class="LineNr">113 </span>    result<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;scenario &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; should start with '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L115" class="LineNr">115 </span>  <span class="Delimiter">}</span>
 <span id="L116" class="LineNr">116 </span>  result<span class="Delimiter">.</span>to_run<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>to_run<span class="Delimiter">.</span>at<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>to_run<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">)</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L118" class="LineNr">118 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;scenario &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; has an unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L119" class="LineNr">119 </span>    result<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;scenario &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; has an unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  result<span class="Delimiter">.</span>to_run<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>to_run<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
@@ -226,9 +227,9 @@ if ('onhashchange' in window) {
 <span id="L161" class="LineNr">161 </span>  cerr &lt;&lt; <span class="Constant">&quot;Mu tests: &quot;</span> &lt;&lt; ctime<span class="Delimiter">(</span>&amp;t<span class="Delimiter">);</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; Num_core_mu_scenarios<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L163" class="LineNr">163 </span><span class="CommentedCode">//?     cerr &lt;&lt; '\n' &lt;&lt; i &lt;&lt; &quot;: &quot; &lt;&lt; Scenarios.at(i).name;</span>
-<span id="L164" class="LineNr">164 </span>    run_mu_scenario<span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L165" class="LineNr">165 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Passed<span class="Delimiter">)</span> cerr &lt;&lt; <span class="Constant">&quot;.&quot;</span><span class="Delimiter">;</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Normal">else</span> ++Num_failures<span class="Delimiter">;</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> run_mu_scenario<span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Passed<span class="Delimiter">)</span> cerr &lt;&lt; <span class="Constant">&quot;.&quot;</span><span class="Delimiter">;</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> ++Num_failures<span class="Delimiter">;</span>
 <span id="L167" class="LineNr">167 </span>  <span class="Delimiter">}</span>
 <span id="L168" class="LineNr">168 </span>  cerr &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L169" class="LineNr">169 </span><span class="Delimiter">}</span>
@@ -238,9 +239,9 @@ if ('onhashchange' in window) {
 <span id="L173" class="LineNr">173 </span>  cerr &lt;&lt; <span class="Constant">&quot;App tests: &quot;</span> &lt;&lt; ctime<span class="Delimiter">(</span>&amp;t<span class="Delimiter">);</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = Num_core_mu_scenarios<span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Scenarios<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L175" class="LineNr">175 </span><span class="CommentedCode">//?     cerr &lt;&lt; '\n' &lt;&lt; i &lt;&lt; &quot;: &quot; &lt;&lt; Scenarios.at(i).name;</span>
-<span id="L176" class="LineNr">176 </span>    run_mu_scenario<span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L177" class="LineNr">177 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Passed<span class="Delimiter">)</span> cerr &lt;&lt; <span class="Constant">&quot;.&quot;</span><span class="Delimiter">;</span>
-<span id="L178" class="LineNr">178 </span>    <span class="Normal">else</span> ++Num_failures<span class="Delimiter">;</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> run_mu_scenario<span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Passed<span class="Delimiter">)</span> cerr &lt;&lt; <span class="Constant">&quot;.&quot;</span><span class="Delimiter">;</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> ++Num_failures<span class="Delimiter">;</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Delimiter">}</span>
 <span id="L180" class="LineNr">180 </span>  cerr &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L181" class="LineNr">181 </span><span class="Delimiter">}</span>
@@ -262,13 +263,13 @@ if ('onhashchange' in window) {
 <span id="L197" class="LineNr">197 </span><span class="Delimiter">:(after &quot;Test Runs&quot;)</span>
 <span id="L198" class="LineNr">198 </span><span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Scenarios<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L199" class="LineNr">199 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == argv[argc-<span class="Constant">1</span>]<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L200" class="LineNr">200 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Start_tracing<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L201" class="LineNr">201 </span>      Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
-<span id="L202" class="LineNr">202 </span>      Save_trace = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L203" class="LineNr">203 </span>    <span class="Delimiter">}</span>
-<span id="L204" class="LineNr">204 </span>    run_mu_scenario<span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L205" class="LineNr">205 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Passed<span class="Delimiter">)</span> cerr &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
-<span id="L206" class="LineNr">206 </span>    <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Start_tracing<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Save_trace = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> run_mu_scenario<span class="Delimiter">(</span>Scenarios<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Passed<span class="Delimiter">)</span> cerr &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Delimiter">}</span>
 <span id="L208" class="LineNr">208 </span><span class="Delimiter">}</span>
 <span id="L209" class="LineNr">209 </span>
@@ -281,27 +282,27 @@ if ('onhashchange' in window) {
 <span id="L216" class="LineNr">216 </span>  <span class="Normal">bool</span> not_already_inside_test = !Trace_stream<span class="Delimiter">;</span>
 <span id="L217" class="LineNr">217 </span><span class="CommentedCode">//?   cerr &lt;&lt; s.name &lt;&lt; '\n';</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>not_already_inside_test<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L219" class="LineNr">219 </span>    Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
-<span id="L220" class="LineNr">220 </span>    <a href='000organization.cc.html#L134'>setup</a><span class="Delimiter">();</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <a href='000organization.cc.html#L134'>setup</a><span class="Delimiter">();</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Delimiter">}</span>
 <span id="L222" class="LineNr">222 </span>  vector&lt;recipe_ordinal&gt; tmp = load<span class="Delimiter">(</span><span class="Constant">&quot;recipe scenario_&quot;</span>+s<span class="Delimiter">.</span>name+<span class="Constant">&quot; [ &quot;</span>+s<span class="Delimiter">.</span>to_run+<span class="Constant">&quot; ]&quot;</span><span class="Delimiter">);</span>
 <span id="L223" class="LineNr">223 </span>  mark_autogenerated<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L224" class="LineNr">224 </span>  bind_special_scenario_names<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L225" class="LineNr">225 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
 <span id="L226" class="LineNr">226 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!trace_contains_errors<span class="Delimiter">())</span>
-<span id="L227" class="LineNr">227 </span>    run<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>front<span class="Delimiter">());</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> run<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>front<span class="Delimiter">());</span>
 <span id="L228" class="LineNr">228 </span>  <span class="Comment">// End Mu Test Teardown</span>
 <span id="L229" class="LineNr">229 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Hide_errors &amp;&amp; <a href='003trace.cc.html#L180'>trace_contains_errors</a><span class="Delimiter">()</span> &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span>
-<span id="L230" class="LineNr">230 </span>    Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L231" class="LineNr">231 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>not_already_inside_test &amp;&amp; Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L232" class="LineNr">232 </span>    <a href='000organization.cc.html#L138'>teardown</a><span class="Delimiter">();</span>
-<span id="L233" class="LineNr">233 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Save_trace<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L234" class="LineNr">234 </span>      ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
-<span id="L235" class="LineNr">235 </span>      fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
-<span id="L236" class="LineNr">236 </span>      fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
-<span id="L237" class="LineNr">237 </span>    <span class="Delimiter">}</span>
-<span id="L238" class="LineNr">238 </span>    <span class="Normal">delete</span> Trace_stream<span class="Delimiter">;</span>
-<span id="L239" class="LineNr">239 </span>    Trace_stream = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <a href='000organization.cc.html#L138'>teardown</a><span class="Delimiter">();</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Save_trace<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ofstream fout<span class="Delimiter">(</span><span class="Constant">&quot;last_trace&quot;</span><span class="Delimiter">);</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> fout &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L143'>readable_contents</a><span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> fout<span class="Delimiter">.</span>close<span class="Delimiter">();</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> Trace_stream<span class="Delimiter">;</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> Trace_stream = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L240" class="LineNr">240 </span>  <span class="Delimiter">}</span>
 <span id="L241" class="LineNr">241 </span>  Current_scenario = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L242" class="LineNr">242 </span><span class="Delimiter">}</span>
@@ -328,7 +329,7 @@ if ('onhashchange' in window) {
 <span id="L263" class="LineNr">263 </span><span class="Normal">void</span> maybe_make_raw<span class="Delimiter">(</span>reagent&amp; r<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L264" class="LineNr">264 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_special_name<span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L265" class="LineNr">265 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;scenario_&quot;</span><span class="Delimiter">))</span>
-<span id="L266" class="LineNr">266 </span>    r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;raw&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;raw&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
 <span id="L267" class="LineNr">267 </span>  <span class="Comment">// End maybe_make_raw</span>
 <span id="L268" class="LineNr">268 </span><span class="Delimiter">}</span>
 <span id="L269" class="LineNr">269 </span>
@@ -342,10 +343,10 @@ if ('onhashchange' in window) {
 <span id="L277" class="LineNr">277 </span><span class="Normal">void</span> test_maybe_make_raw<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L278" class="LineNr">278 </span>  <span class="Comment">// check that scenarios can use local-scope and special variables together</span>
 <span id="L279" class="LineNr">279 </span>  vector&lt;recipe_ordinal&gt; tmp = load<span class="Delimiter">(</span>
-<span id="L280" class="LineNr">280 </span>      <span class="Constant">&quot;def scenario_foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L281" class="LineNr">281 </span>      <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L282" class="LineNr">282 </span>      <span class="Constant">&quot;  __maybe_make_raw_test__:num &lt;- copy 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L283" class="LineNr">283 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;def scenario_foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  __maybe_make_raw_test__:num &lt;- copy 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L284" class="LineNr">284 </span>  mark_autogenerated<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L285" class="LineNr">285 </span>  bind_special_scenario_names<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L286" class="LineNr">286 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
@@ -370,7 +371,7 @@ if ('onhashchange' in window) {
 <span id="L305" class="LineNr">305 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L306" class="LineNr">306 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> foo [
 <span id="L307" class="LineNr">307 </span>  memory-should-contain [
-<span id="L308" class="LineNr">308 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
 <span id="L309" class="LineNr">309 </span>  <span class="Comment"># missing ']'</span>
 <span id="L310" class="LineNr">310 </span>]
 <span id="L311" class="LineNr">311 </span><span class="Comment"># no crash</span>
@@ -396,7 +397,7 @@ if ('onhashchange' in window) {
 <span id="L331" class="LineNr">331 </span><span class="Delimiter">:(scenario run)</span>
 <span id="L332" class="LineNr">332 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L333" class="LineNr">333 </span>  run [
-<span id="L334" class="LineNr">334 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
 <span id="L335" class="LineNr">335 </span>  ]
 <span id="L336" class="LineNr">336 </span>]
 <span id="L337" class="LineNr">337 </span><span class="traceContains">+mem: storing 13 in location 1</span>
@@ -413,10 +414,10 @@ if ('onhashchange' in window) {
 <span id="L348" class="LineNr">348 </span><span class="Delimiter">:(scenario run_multiple)</span>
 <span id="L349" class="LineNr">349 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L350" class="LineNr">350 </span>  run [
-<span id="L351" class="LineNr">351 </span>    <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
 <span id="L352" class="LineNr">352 </span>  ]
 <span id="L353" class="LineNr">353 </span>  run [
-<span id="L354" class="LineNr">354 </span>    <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
+<span id="L354" class="LineNr">354 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">13</span>
 <span id="L355" class="LineNr">355 </span>  ]
 <span id="L356" class="LineNr">356 </span>]
 <span id="L357" class="LineNr">357 </span><span class="traceContains">+mem: storing 13 in location 1</span>
@@ -435,7 +436,7 @@ if ('onhashchange' in window) {
 <span id="L370" class="LineNr">370 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L371" class="LineNr">371 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L372" class="LineNr">372 </span>  memory-should-contain [
-<span id="L373" class="LineNr">373 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">13</span>
 <span id="L374" class="LineNr">374 </span>  ]
 <span id="L375" class="LineNr">375 </span>]
 <span id="L376" class="LineNr">376 </span><span class="traceContains">+run: checking location 1</span>
@@ -462,83 +463,83 @@ if ('onhashchange' in window) {
 <span id="L397" class="LineNr">397 </span>  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
 <span id="L398" class="LineNr">398 </span>  set&lt;<span class="Normal">int</span>&gt; locations_checked<span class="Delimiter">;</span>
 <span id="L399" class="LineNr">399 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L400" class="LineNr">400 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L401" class="LineNr">401 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L402" class="LineNr">402 </span>    string lhs = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L403" class="LineNr">403 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>lhs<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L404" class="LineNr">404 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L405" class="LineNr">405 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L406" class="LineNr">406 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L407" class="LineNr">407 </span>    <span class="Delimiter">}</span>
-<span id="L408" class="LineNr">408 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>lhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L409" class="LineNr">409 </span>      <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span>lhs<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
-<span id="L410" class="LineNr">410 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L411" class="LineNr">411 </span>    <span class="Delimiter">}</span>
-<span id="L412" class="LineNr">412 </span>    <span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>lhs<span class="Delimiter">);</span>
-<span id="L413" class="LineNr">413 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L414" class="LineNr">414 </span>    string _assign<span class="Delimiter">;</span>  in &gt;&gt; _assign<span class="Delimiter">;</span>  assert<span class="Delimiter">(</span>_assign == <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">);</span>
-<span id="L415" class="LineNr">415 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L416" class="LineNr">416 </span>    string rhs = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L417" class="LineNr">417 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>rhs<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L418" class="LineNr">418 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L419" class="LineNr">419 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L420" class="LineNr">420 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L421" class="LineNr">421 </span>    <span class="Delimiter">}</span>
-<span id="L422" class="LineNr">422 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>rhs<span class="Delimiter">)</span> &amp;&amp; !is_noninteger<span class="Delimiter">(</span>rhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L423" class="LineNr">423 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span>
-<span id="L424" class="LineNr">424 </span>        <span class="Comment">// genuine test in a .mu file</span>
-<span id="L425" class="LineNr">425 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' can't contain non-number &quot;</span> &lt;&lt; rhs &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L426" class="LineNr">426 </span>      <span class="Normal">else</span>
-<span id="L427" class="LineNr">427 </span>        <span class="Comment">// just testing scenario support</span>
-<span id="L428" class="LineNr">428 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' can't contain non-number &quot;</span> &lt;&lt; rhs &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L429" class="LineNr">429 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L430" class="LineNr">430 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L431" class="LineNr">431 </span>    <span class="Delimiter">}</span>
-<span id="L432" class="LineNr">432 </span>    <span class="Normal">double</span> value = <a href='015literal_noninteger.cc.html#L26'>to_double</a><span class="Delimiter">(</span>rhs<span class="Delimiter">);</span>
-<span id="L433" class="LineNr">433 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>locations_checked<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span>
-<span id="L434" class="LineNr">434 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;duplicate expectation for location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L435" class="LineNr">435 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking location &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L436" class="LineNr">436 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">)</span> != value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L437" class="LineNr">437 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L438" class="LineNr">438 </span>        <span class="Comment">// genuine test in a .mu file</span>
-<span id="L439" class="LineNr">439 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L440" class="LineNr">440 </span>      <span class="Delimiter">}</span>
-<span id="L441" class="LineNr">441 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L442" class="LineNr">442 </span>        <span class="Comment">// just testing scenario support</span>
-<span id="L443" class="LineNr">443 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L444" class="LineNr">444 </span>      <span class="Delimiter">}</span>
-<span id="L445" class="LineNr">445 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L446" class="LineNr">446 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L447" class="LineNr">447 </span>    <span class="Delimiter">}</span>
-<span id="L448" class="LineNr">448 </span>    locations_checked<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">);</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> string lhs = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>lhs<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L404" class="LineNr">404 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>lhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span>lhs<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>lhs<span class="Delimiter">);</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L414" class="LineNr">414 </span>  <span class="Conceal">¦</span> string _assign<span class="Delimiter">;</span>  in &gt;&gt; _assign<span class="Delimiter">;</span>  assert<span class="Delimiter">(</span>_assign == <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">);</span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> string rhs = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>rhs<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L419" class="LineNr">419 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_integer<span class="Delimiter">(</span>rhs<span class="Delimiter">)</span> &amp;&amp; !is_noninteger<span class="Delimiter">(</span>rhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// genuine test in a .mu file</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' can't contain non-number &quot;</span> &lt;&lt; rhs &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// just testing scenario support</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' can't contain non-number &quot;</span> &lt;&lt; rhs &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <span class="Normal">double</span> value = <a href='015literal_noninteger.cc.html#L26'>to_double</a><span class="Delimiter">(</span>rhs<span class="Delimiter">);</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>locations_checked<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;duplicate expectation for location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L435" class="LineNr">435 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking location &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">)</span> != value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L437" class="LineNr">437 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// genuine test in a .mu file</span>
+<span id="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L440" class="LineNr">440 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// just testing scenario support</span>
+<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span>value<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L444" class="LineNr">444 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> locations_checked<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">);</span>
 <span id="L449" class="LineNr">449 </span>  <span class="Delimiter">}</span>
 <span id="L450" class="LineNr">450 </span><span class="Delimiter">}</span>
 <span id="L451" class="LineNr">451 </span>
 <span id="L452" class="LineNr">452 </span><span class="Normal">void</span> <a href='047check_type_by_name.cc.html#L49'>check_type</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; lhs<span class="Delimiter">,</span> istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L453" class="LineNr">453 </span>  reagent x<span class="Delimiter">(</span>lhs<span class="Delimiter">);</span>
 <span id="L454" class="LineNr">454 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &amp;&amp; is_mu_character<span class="Delimiter">(</span><a href='032array.cc.html#L370'>array_element</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L455" class="LineNr">455 </span>    x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
-<span id="L456" class="LineNr">456 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L457" class="LineNr">457 </span>    string _assign = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L458" class="LineNr">458 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>_assign<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L459" class="LineNr">459 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L460" class="LineNr">460 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L461" class="LineNr">461 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L462" class="LineNr">462 </span>    <span class="Delimiter">}</span>
-<span id="L463" class="LineNr">463 </span>    assert<span class="Delimiter">(</span>_assign == <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">);</span>
-<span id="L464" class="LineNr">464 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L465" class="LineNr">465 </span>    string literal = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L466" class="LineNr">466 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>literal<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L467" class="LineNr">467 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L468" class="LineNr">468 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (3)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L469" class="LineNr">469 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L470" class="LineNr">470 </span>    <span class="Delimiter">}</span>
-<span id="L471" class="LineNr">471 </span>    <span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = x<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
-<span id="L472" class="LineNr">472 </span>    <span class="Comment">// exclude quoting brackets</span>
-<span id="L473" class="LineNr">473 </span>    assert<span class="Delimiter">(</span>*literal<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>  literal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>literal<span class="Delimiter">.</span>begin<span class="Delimiter">());</span>
-<span id="L474" class="LineNr">474 </span>    assert<span class="Delimiter">(</span>*--literal<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> == <span class="Constant">']'</span><span class="Delimiter">);</span>  literal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>--literal<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
-<span id="L475" class="LineNr">475 </span>    check_string<span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> literal<span class="Delimiter">);</span>
-<span id="L476" class="LineNr">476 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L455" class="LineNr">455 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L457" class="LineNr">457 </span>  <span class="Conceal">¦</span> string _assign = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>_assign<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>_assign == <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">);</span>
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> string literal = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>literal<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'memory-should-contain' block at <a href='003trace.cc.html#L185'>end</a> of file (3)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L469" class="LineNr">469 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = x<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> <span class="Comment">// exclude quoting brackets</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>*literal<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>  literal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>literal<span class="Delimiter">.</span>begin<span class="Delimiter">());</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>*--literal<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> == <span class="Constant">']'</span><span class="Delimiter">);</span>  literal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>--literal<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> check_string<span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> literal<span class="Delimiter">);</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L477" class="LineNr">477 </span>  <span class="Delimiter">}</span>
 <span id="L478" class="LineNr">478 </span>  <span class="Comment">// End Scenario Type Special-cases</span>
 <span id="L479" class="LineNr">479 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;don't know how to check memory for '&quot;</span> &lt;&lt; lhs &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
@@ -547,28 +548,28 @@ if ('onhashchange' in window) {
 <span id="L482" class="LineNr">482 </span><span class="Normal">void</span> check_string<span class="Delimiter">(</span><span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; literal<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L483" class="LineNr">483 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking string length at &quot;</span> &lt;&lt; <a href='043space.cc.html#L76'>address</a> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L484" class="LineNr">484 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>literal<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L485" class="LineNr">485 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span>
-<span id="L486" class="LineNr">486 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain length &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>literal<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; of string [&quot;</span> &lt;&lt; literal &lt;&lt; <span class="Constant">&quot;] but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span>address-<span class="Comment">/*</span><span class="Comment">fake refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L487" class="LineNr">487 </span>    <span class="Normal">else</span>
-<span id="L488" class="LineNr">488 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain length &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>literal<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; of string [&quot;</span> &lt;&lt; literal &lt;&lt; <span class="Constant">&quot;] but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L489" class="LineNr">489 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L490" class="LineNr">490 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span>
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain length &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>literal<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; of string [&quot;</span> &lt;&lt; literal &lt;&lt; <span class="Constant">&quot;] but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span>address-<span class="Comment">/*</span><span class="Comment">fake refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L487" class="LineNr">487 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L488" class="LineNr">488 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected location '&quot;</span> &lt;&lt; address &lt;&lt; <span class="Constant">&quot;' to contain length &quot;</span> &lt;&lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>literal<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; of string [&quot;</span> &lt;&lt; literal &lt;&lt; <span class="Constant">&quot;] but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L489" class="LineNr">489 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L490" class="LineNr">490 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L491" class="LineNr">491 </span>  <span class="Delimiter">}</span>
 <span id="L492" class="LineNr">492 </span>  ++address<span class="Delimiter">;</span>  <span class="Comment">// now skip length</span>
 <span id="L493" class="LineNr">493 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>literal<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L494" class="LineNr">494 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking location &quot;</span> &lt;&lt; address+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L495" class="LineNr">495 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">)</span> != literal<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L496" class="LineNr">496 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L497" class="LineNr">497 </span>        <span class="Comment">// genuine test in a .mu file</span>
-<span id="L498" class="LineNr">498 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected location &quot;</span> &lt;&lt; <span class="Delimiter">(</span>address+i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; to contain &quot;</span> &lt;&lt; literal<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; ('&quot;</span> &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L499" class="LineNr">499 </span>      <span class="Delimiter">}</span>
-<span id="L500" class="LineNr">500 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L501" class="LineNr">501 </span>        <span class="Comment">// just testing scenario support</span>
-<span id="L502" class="LineNr">502 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected location &quot;</span> &lt;&lt; <span class="Delimiter">(</span>address+i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; to contain &quot;</span> &lt;&lt; literal<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L503" class="LineNr">503 </span>      <span class="Delimiter">}</span>
-<span id="L504" class="LineNr">504 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L505" class="LineNr">505 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L506" class="LineNr">506 </span>    <span class="Delimiter">}</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking location &quot;</span> &lt;&lt; address+i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">)</span> != literal<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L496" class="LineNr">496 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L497" class="LineNr">497 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// genuine test in a .mu file</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected location &quot;</span> &lt;&lt; <span class="Delimiter">(</span>address+i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; to contain &quot;</span> &lt;&lt; literal<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot; ('&quot;</span> &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L501" class="LineNr">501 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// just testing scenario support</span>
+<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected location &quot;</span> &lt;&lt; <span class="Delimiter">(</span>address+i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; to contain &quot;</span> &lt;&lt; literal<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but saw &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> address+i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L504" class="LineNr">504 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L505" class="LineNr">505 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L506" class="LineNr">506 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L507" class="LineNr">507 </span>  <span class="Delimiter">}</span>
 <span id="L508" class="LineNr">508 </span><span class="Delimiter">}</span>
 <span id="L509" class="LineNr">509 </span>
@@ -577,8 +578,8 @@ if ('onhashchange' in window) {
 <span id="L512" class="LineNr">512 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L513" class="LineNr">513 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L514" class="LineNr">514 </span>  memory-should-contain [
-<span id="L515" class="LineNr">515 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
-<span id="L516" class="LineNr">516 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
+<span id="L515" class="LineNr">515 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
+<span id="L516" class="LineNr">516 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
 <span id="L517" class="LineNr">517 </span>  ]
 <span id="L518" class="LineNr">518 </span>]
 <span id="L519" class="LineNr">519 </span><span class="traceContains">+error: duplicate expectation for location '1'</span>
@@ -592,7 +593,7 @@ if ('onhashchange' in window) {
 <span id="L527" class="LineNr">527 </span>  <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">98</span>  <span class="Comment"># 'b'</span>
 <span id="L528" class="LineNr">528 </span>  <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">99</span>  <span class="Comment"># 'c'</span>
 <span id="L529" class="LineNr">529 </span>  memory-should-contain [
-<span id="L530" class="LineNr">530 </span>    <span class="Constant">1</span>:array:character<span class="Special"> &lt;- </span>[ab]
+<span id="L530" class="LineNr">530 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:array:character<span class="Special"> &lt;- </span>[ab]
 <span id="L531" class="LineNr">531 </span>  ]
 <span id="L532" class="LineNr">532 </span>]
 <span id="L533" class="LineNr">533 </span><span class="traceContains">+error: expected location '1' to contain length 2 of string [ab] but saw 3</span>
@@ -604,7 +605,7 @@ if ('onhashchange' in window) {
 <span id="L539" class="LineNr">539 </span>  <span class="Constant">3</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">98</span>  <span class="Comment"># 'b'</span>
 <span id="L540" class="LineNr">540 </span>  <span class="Constant">4</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">99</span>  <span class="Comment"># 'c'</span>
 <span id="L541" class="LineNr">541 </span>  memory-should-contain [
-<span id="L542" class="LineNr">542 </span>    <span class="Constant">1</span>:array:character<span class="Special"> &lt;- </span>[abc]
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:array:character<span class="Special"> &lt;- </span>[abc]
 <span id="L543" class="LineNr">543 </span>  ]
 <span id="L544" class="LineNr">544 </span>]
 <span id="L545" class="LineNr">545 </span><span class="traceContains">+run: checking string length at 1</span>
@@ -617,7 +618,7 @@ if ('onhashchange' in window) {
 <span id="L552" class="LineNr">552 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L553" class="LineNr">553 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L554" class="LineNr">554 </span>  memory-should-contain [
-<span id="L555" class="LineNr">555 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span>[abc]
+<span id="L555" class="LineNr">555 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span>[abc]
 <span id="L556" class="LineNr">556 </span>  ]
 <span id="L557" class="LineNr">557 </span>]
 <span id="L558" class="LineNr">558 </span><span class="traceContains">+error: location '1' can't contain non-number [abc]</span>
@@ -627,7 +628,7 @@ if ('onhashchange' in window) {
 <span id="L562" class="LineNr">562 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L563" class="LineNr">563 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L564" class="LineNr">564 </span>  memory-should-contain [
-<span id="L565" class="LineNr">565 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">34</span>  <span class="Comment"># comment</span>
+<span id="L565" class="LineNr">565 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">34</span>  <span class="Comment"># comment</span>
 <span id="L566" class="LineNr">566 </span>  ]
 <span id="L567" class="LineNr">567 </span>]
 <span id="L568" class="LineNr">568 </span><span class="traceAbsent">-error: location 1 can't contain non-number 34  # comment</span>
@@ -643,8 +644,8 @@ if ('onhashchange' in window) {
 <span id="L578" class="LineNr">578 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L579" class="LineNr">579 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L580" class="LineNr">580 </span>  trace-should-contain [
-<span id="L581" class="LineNr">581 </span>    <span class="Normal">a</span>: b
-<span id="L582" class="LineNr">582 </span>    <span class="Normal">a</span>: d
+<span id="L581" class="LineNr">581 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: b
+<span id="L582" class="LineNr">582 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: d
 <span id="L583" class="LineNr">583 </span>  ]
 <span id="L584" class="LineNr">584 </span>]
 <span id="L585" class="LineNr">585 </span><span class="traceContains">+error: missing [b] in <a href='003trace.cc.html#L161'>trace</a> with label 'a'</span>
@@ -673,20 +674,20 @@ if ('onhashchange' in window) {
 <span id="L608" class="LineNr">608 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L609" class="LineNr">609 </span>  <span class="Normal">int</span> curr_expected_line = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L610" class="LineNr">610 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L611" class="LineNr">611 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L612" class="LineNr">612 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>contents != <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L613" class="LineNr">613 </span>    <span class="Comment">// match</span>
-<span id="L614" class="LineNr">614 </span>    ++curr_expected_line<span class="Delimiter">;</span>
-<span id="L615" class="LineNr">615 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L611" class="LineNr">611 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label != p<span class="Delimiter">-&gt;</span>label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L612" class="LineNr">612 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>contents != <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L613" class="LineNr">613 </span>  <span class="Conceal">¦</span> <span class="Comment">// match</span>
+<span id="L614" class="LineNr">614 </span>  <span class="Conceal">¦</span> ++curr_expected_line<span class="Delimiter">;</span>
+<span id="L615" class="LineNr">615 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_expected_line == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L616" class="LineNr">616 </span>  <span class="Delimiter">}</span>
 <span id="L617" class="LineNr">617 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span>
-<span id="L618" class="LineNr">618 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: missing [&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>contents &lt;&lt; <span class="Constant">&quot;] &quot;</span>
-<span id="L619" class="LineNr">619 </span>          &lt;&lt; <span class="Constant">&quot;in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L618" class="LineNr">618 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: missing [&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>contents &lt;&lt; <span class="Constant">&quot;] &quot;</span>
+<span id="L619" class="LineNr">619 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &lt;&lt; <span class="Constant">&quot;in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L620" class="LineNr">620 </span>  <span class="Normal">else</span>
-<span id="L621" class="LineNr">621 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;missing [&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>contents &lt;&lt; <span class="Constant">&quot;] &quot;</span>
-<span id="L622" class="LineNr">622 </span>          &lt;&lt; <span class="Constant">&quot;in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L621" class="LineNr">621 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;missing [&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>contents &lt;&lt; <span class="Constant">&quot;] &quot;</span>
+<span id="L622" class="LineNr">622 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &lt;&lt; <span class="Constant">&quot;in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L623" class="LineNr">623 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Hide_errors<span class="Delimiter">)</span>
-<span id="L624" class="LineNr">624 </span>    <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label<span class="Delimiter">);</span>
+<span id="L624" class="LineNr">624 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>expected_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>curr_expected_line<span class="Delimiter">).</span>label<span class="Delimiter">);</span>
 <span id="L625" class="LineNr">625 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L626" class="LineNr">626 </span><span class="Delimiter">}</span>
 <span id="L627" class="LineNr">627 </span>
@@ -694,15 +695,15 @@ if ('onhashchange' in window) {
 <span id="L629" class="LineNr">629 </span>  vector&lt;string&gt; buf = <a href='003trace.cc.html#L331'>split</a><span class="Delimiter">(</span>expected<span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L630" class="LineNr">630 </span>  vector&lt;trace_line&gt; result<span class="Delimiter">;</span>
 <span id="L631" class="LineNr">631 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>buf<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L632" class="LineNr">632 </span>    buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L633" class="LineNr">633 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L634" class="LineNr">634 </span>    <span class="Normal">int</span> delim = buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>find<span class="Delimiter">(</span><span class="Constant">&quot;: &quot;</span><span class="Delimiter">);</span>
-<span id="L635" class="LineNr">635 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>delim == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L636" class="LineNr">636 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: lines in 'trace-should-contain' should be of the form &lt;label&gt;: &lt;contents&gt;. Both parts are required.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L637" class="LineNr">637 </span>      result<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
-<span id="L638" class="LineNr">638 </span>      <span class="Identifier">return</span> result<span class="Delimiter">;</span>
-<span id="L639" class="LineNr">639 </span>    <span class="Delimiter">}</span>
-<span id="L640" class="LineNr">640 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span><a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> delim<span class="Delimiter">)),</span>  <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>substr<span class="Delimiter">(</span>delim+<span class="Constant">2</span><span class="Delimiter">))));</span>
+<span id="L632" class="LineNr">632 </span>  <span class="Conceal">¦</span> buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L633" class="LineNr">633 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L634" class="LineNr">634 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> delim = buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>find<span class="Delimiter">(</span><span class="Constant">&quot;: &quot;</span><span class="Delimiter">);</span>
+<span id="L635" class="LineNr">635 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>delim == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L636" class="LineNr">636 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: lines in 'trace-should-contain' should be of the form &lt;label&gt;: &lt;contents&gt;. Both parts are required.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L637" class="LineNr">637 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L638" class="LineNr">638 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L639" class="LineNr">639 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L640" class="LineNr">640 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span><a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>substr<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> delim<span class="Delimiter">)),</span>  <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span>buf<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>substr<span class="Delimiter">(</span>delim+<span class="Constant">2</span><span class="Delimiter">))));</span>
 <span id="L641" class="LineNr">641 </span>  <span class="Delimiter">}</span>
 <span id="L642" class="LineNr">642 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L643" class="LineNr">643 </span><span class="Delimiter">}</span>
@@ -712,11 +713,11 @@ if ('onhashchange' in window) {
 <span id="L647" class="LineNr">647 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L648" class="LineNr">648 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L649" class="LineNr">649 </span>  run [
-<span id="L650" class="LineNr">650 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [b]
+<span id="L650" class="LineNr">650 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [b]
 <span id="L651" class="LineNr">651 </span>  ]
 <span id="L652" class="LineNr">652 </span>  trace-should-contain [
-<span id="L653" class="LineNr">653 </span>    <span class="Normal">a</span>: b
-<span id="L654" class="LineNr">654 </span>    <span class="Normal">a</span>: d
+<span id="L653" class="LineNr">653 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: b
+<span id="L654" class="LineNr">654 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: d
 <span id="L655" class="LineNr">655 </span>  ]
 <span id="L656" class="LineNr">656 </span>]
 <span id="L657" class="LineNr">657 </span><span class="traceContains">+error: missing [d] in <a href='003trace.cc.html#L161'>trace</a> with label 'a'</span>
@@ -725,10 +726,10 @@ if ('onhashchange' in window) {
 <span id="L660" class="LineNr">660 </span><span class="Special">% Scenario_testing_scenario = true;</span>
 <span id="L661" class="LineNr">661 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L662" class="LineNr">662 </span>  run [
-<span id="L663" class="LineNr">663 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [b]
+<span id="L663" class="LineNr">663 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [b]
 <span id="L664" class="LineNr">664 </span>  ]
 <span id="L665" class="LineNr">665 </span>  trace-should-contain [
-<span id="L666" class="LineNr">666 </span>    <span class="Normal">a</span>: b
+<span id="L666" class="LineNr">666 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: b
 <span id="L667" class="LineNr">667 </span>  ]
 <span id="L668" class="LineNr">668 </span>]
 <span id="L669" class="LineNr">669 </span><span class="traceAbsent">-error: missing [b] in <a href='003trace.cc.html#L161'>trace</a> with label 'a'</span>
@@ -743,10 +744,10 @@ if ('onhashchange' in window) {
 <span id="L678" class="LineNr">678 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L679" class="LineNr">679 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L680" class="LineNr">680 </span>  run [
-<span id="L681" class="LineNr">681 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [b]
+<span id="L681" class="LineNr">681 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [b]
 <span id="L682" class="LineNr">682 </span>  ]
 <span id="L683" class="LineNr">683 </span>  trace-should-<span class="Normal">not</span>-contain [
-<span id="L684" class="LineNr">684 </span>    <span class="Normal">a</span>: b
+<span id="L684" class="LineNr">684 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: b
 <span id="L685" class="LineNr">685 </span>  ]
 <span id="L686" class="LineNr">686 </span>]
 <span id="L687" class="LineNr">687 </span><span class="traceContains">+error: unexpected [b] in <a href='003trace.cc.html#L161'>trace</a> with label 'a'</span>
@@ -773,11 +774,11 @@ if ('onhashchange' in window) {
 <span id="L708" class="LineNr">708 </span>  Trace_stream<span class="Delimiter">-&gt;</span><a href='003trace.cc.html#L127'>newline</a><span class="Delimiter">();</span>
 <span id="L709" class="LineNr">709 </span>  vector&lt;trace_line&gt; lines = parse_trace<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L710" class="LineNr">710 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>lines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L711" class="LineNr">711 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>trace_count<span class="Delimiter">(</span>lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>label<span class="Delimiter">,</span> lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>contents<span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L712" class="LineNr">712 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unexpected [&quot;</span> &lt;&lt; lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>contents &lt;&lt; <span class="Constant">&quot;] in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>label &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L713" class="LineNr">713 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L714" class="LineNr">714 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L715" class="LineNr">715 </span>    <span class="Delimiter">}</span>
+<span id="L711" class="LineNr">711 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>trace_count<span class="Delimiter">(</span>lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>label<span class="Delimiter">,</span> lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>contents<span class="Delimiter">)</span> != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L712" class="LineNr">712 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unexpected [&quot;</span> &lt;&lt; lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>contents &lt;&lt; <span class="Constant">&quot;] in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>label &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L713" class="LineNr">713 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L714" class="LineNr">714 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L715" class="LineNr">715 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L716" class="LineNr">716 </span>  <span class="Delimiter">}</span>
 <span id="L717" class="LineNr">717 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L718" class="LineNr">718 </span><span class="Delimiter">}</span>
@@ -786,7 +787,7 @@ if ('onhashchange' in window) {
 <span id="L721" class="LineNr">721 </span><span class="Special">% Scenario_testing_scenario = true;</span>
 <span id="L722" class="LineNr">722 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L723" class="LineNr">723 </span>  trace-should-<span class="Normal">not</span>-contain [
-<span id="L724" class="LineNr">724 </span>    <span class="Normal">a</span>: b
+<span id="L724" class="LineNr">724 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: b
 <span id="L725" class="LineNr">725 </span>  ]
 <span id="L726" class="LineNr">726 </span>]
 <span id="L727" class="LineNr">727 </span><span class="traceAbsent">-error: unexpected [b] in <a href='003trace.cc.html#L161'>trace</a> with label 'a'</span>
@@ -797,11 +798,11 @@ if ('onhashchange' in window) {
 <span id="L732" class="LineNr">732 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L733" class="LineNr">733 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L734" class="LineNr">734 </span>  run [
-<span id="L735" class="LineNr">735 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [d]
+<span id="L735" class="LineNr">735 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [d]
 <span id="L736" class="LineNr">736 </span>  ]
 <span id="L737" class="LineNr">737 </span>  trace-should-<span class="Normal">not</span>-contain [
-<span id="L738" class="LineNr">738 </span>    <span class="Normal">a</span>: b
-<span id="L739" class="LineNr">739 </span>    <span class="Normal">a</span>: d
+<span id="L738" class="LineNr">738 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: b
+<span id="L739" class="LineNr">739 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>: d
 <span id="L740" class="LineNr">740 </span>  ]
 <span id="L741" class="LineNr">741 </span>]
 <span id="L742" class="LineNr">742 </span><span class="traceContains">+error: unexpected [d] in <a href='003trace.cc.html#L161'>trace</a> with label 'a'</span>
@@ -809,7 +810,7 @@ if ('onhashchange' in window) {
 <span id="L744" class="LineNr">744 </span><span class="Delimiter">:(scenario trace_count_check)</span>
 <span id="L745" class="LineNr">745 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L746" class="LineNr">746 </span>  run [
-<span id="L747" class="LineNr">747 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [foo]
+<span id="L747" class="LineNr">747 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [foo]
 <span id="L748" class="LineNr">748 </span>  ]
 <span id="L749" class="LineNr">749 </span>  check-trace-count-<span class="Normal">for</span>-label <span class="Constant">1</span><span class="Delimiter">,</span> [a]
 <span id="L750" class="LineNr">750 </span>]
@@ -822,16 +823,16 @@ if ('onhashchange' in window) {
 <span id="L757" class="LineNr">757 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L758" class="LineNr">758 </span><span class="Normal">case</span> CHECK_TRACE_COUNT_FOR_LABEL: <span class="Delimiter">{</span>
 <span id="L759" class="LineNr">759 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L760" class="LineNr">760 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'check-trace-count-for-label' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L761" class="LineNr">761 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L760" class="LineNr">760 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'check-trace-count-for-label' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L761" class="LineNr">761 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L762" class="LineNr">762 </span>  <span class="Delimiter">}</span>
 <span id="L763" class="LineNr">763 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L764" class="LineNr">764 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'check-trace-count-for-label' should be a number (count), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L765" class="LineNr">765 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L764" class="LineNr">764 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'check-trace-count-for-label' should be a number (count), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L765" class="LineNr">765 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L766" class="LineNr">766 </span>  <span class="Delimiter">}</span>
 <span id="L767" class="LineNr">767 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L768" class="LineNr">768 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'check-trace-count-for-label' should be a literal string (label), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L769" class="LineNr">769 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L768" class="LineNr">768 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'check-trace-count-for-label' should be a literal string (label), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L769" class="LineNr">769 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L770" class="LineNr">770 </span>  <span class="Delimiter">}</span>
 <span id="L771" class="LineNr">771 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L772" class="LineNr">772 </span><span class="Delimiter">}</span>
@@ -842,16 +843,16 @@ if ('onhashchange' in window) {
 <span id="L777" class="LineNr">777 </span>  string label = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
 <span id="L778" class="LineNr">778 </span>  <span class="Normal">int</span> count = trace_count<span class="Delimiter">(</span>label<span class="Delimiter">);</span>
 <span id="L779" class="LineNr">779 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>count != expected_count<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L780" class="LineNr">780 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L781" class="LineNr">781 </span>      <span class="Comment">// genuine test in a .mu file</span>
-<span id="L782" class="LineNr">782 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;expected &quot;</span> &lt;&lt; expected_count &lt;&lt; <span class="Constant">&quot; lines in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;' in <a href='003trace.cc.html#L161'>trace</a>: &quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L783" class="LineNr">783 </span>      <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
-<span id="L784" class="LineNr">784 </span>    <span class="Delimiter">}</span>
-<span id="L785" class="LineNr">785 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L786" class="LineNr">786 </span>      <span class="Comment">// just testing scenario support</span>
-<span id="L787" class="LineNr">787 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;expected &quot;</span> &lt;&lt; expected_count &lt;&lt; <span class="Constant">&quot; lines in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;' in <a href='003trace.cc.html#L161'>trace</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L788" class="LineNr">788 </span>    <span class="Delimiter">}</span>
-<span id="L789" class="LineNr">789 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L780" class="LineNr">780 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L781" class="LineNr">781 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// genuine test in a .mu file</span>
+<span id="L782" class="LineNr">782 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;expected &quot;</span> &lt;&lt; expected_count &lt;&lt; <span class="Constant">&quot; lines in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;' in <a href='003trace.cc.html#L161'>trace</a>: &quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L783" class="LineNr">783 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L165'>DUMP</a><span class="Delimiter">(</span>label<span class="Delimiter">);</span>
+<span id="L784" class="LineNr">784 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L785" class="LineNr">785 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L786" class="LineNr">786 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// just testing scenario support</span>
+<span id="L787" class="LineNr">787 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;expected &quot;</span> &lt;&lt; expected_count &lt;&lt; <span class="Constant">&quot; lines in <a href='003trace.cc.html#L161'>trace</a> with label '&quot;</span> &lt;&lt; label &lt;&lt; <span class="Constant">&quot;' in <a href='003trace.cc.html#L161'>trace</a></span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L788" class="LineNr">788 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L789" class="LineNr">789 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L790" class="LineNr">790 </span>  <span class="Delimiter">}</span>
 <span id="L791" class="LineNr">791 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L792" class="LineNr">792 </span><span class="Delimiter">}</span>
@@ -861,7 +862,7 @@ if ('onhashchange' in window) {
 <span id="L796" class="LineNr">796 </span><span class="Special">% Hide_errors = true;</span>
 <span id="L797" class="LineNr">797 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L798" class="LineNr">798 </span>  run [
-<span id="L799" class="LineNr">799 </span>    <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [foo]
+<span id="L799" class="LineNr">799 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a> <span class="Constant">1</span><span class="Delimiter">,</span> [a]<span class="Delimiter">,</span> [foo]
 <span id="L800" class="LineNr">800 </span>  ]
 <span id="L801" class="LineNr">801 </span>  check-trace-count-<span class="Normal">for</span>-label <span class="Constant">2</span><span class="Delimiter">,</span> [a]
 <span id="L802" class="LineNr">802 </span>]
@@ -891,10 +892,10 @@ if ('onhashchange' in window) {
 <span id="L826" class="LineNr">826 </span>
 <span id="L827" class="LineNr">827 </span><span class="Delimiter">:(after &quot;void transform_all()&quot;)</span>
 <span id="L828" class="LineNr">828 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;recipe_ordinal<span class="Delimiter">,</span> recipe&gt;::iterator p = Recipe<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Recipe<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L829" class="LineNr">829 </span>    <span class="Normal">const</span> recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
-<span id="L830" class="LineNr">830 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'_'</span><span class="Delimiter">)</span> == string::npos<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L831" class="LineNr">831 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>is_autogenerated<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// created by previous call to transform_all()</span>
-<span id="L832" class="LineNr">832 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; r<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: don't create recipes with '_' in the name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L829" class="LineNr">829 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; r = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L830" class="LineNr">830 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">'_'</span><span class="Delimiter">)</span> == string::npos<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L831" class="LineNr">831 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>is_autogenerated<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// created by previous call to transform_all()</span>
+<span id="L832" class="LineNr">832 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; r<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: don't create recipes with '_' in the name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L833" class="LineNr">833 </span>  <span class="Delimiter">}</span>
 <span id="L834" class="LineNr">834 </span>
 <span id="L835" class="LineNr">835 </span><span class="SalientComment">//:: Helpers</span>
@@ -908,9 +909,9 @@ if ('onhashchange' in window) {
 <span id="L843" class="LineNr">843 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L844" class="LineNr">844 </span>  string _scenario = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L845" class="LineNr">845 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>_scenario<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L846" class="LineNr">846 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L847" class="LineNr">847 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;no <a href='050scenario.cc.html#L57'>scenario</a> in string passed into run_mu_scenario()</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L848" class="LineNr">848 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L846" class="LineNr">846 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L847" class="LineNr">847 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;no <a href='050scenario.cc.html#L57'>scenario</a> in string passed into run_mu_scenario()</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L848" class="LineNr">848 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L849" class="LineNr">849 </span>  <span class="Delimiter">}</span>
 <span id="L850" class="LineNr">850 </span>  assert<span class="Delimiter">(</span>_scenario == <span class="Constant">&quot;scenario&quot;</span><span class="Delimiter">);</span>
 <span id="L851" class="LineNr">851 </span>  <a href='050scenario.cc.html#L57'>scenario</a> s = <a href='050scenario.cc.html#L91'>parse_scenario</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
diff --git a/html/051scenario_test.mu.html b/html/051scenario_test.mu.html
index 21b5fd8f..cea59dd8 100644
--- a/html/051scenario_test.mu.html
+++ b/html/051scenario_test.mu.html
@@ -15,11 +15,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muScenario { color: #00af00; }
 -->
 </style>
 
@@ -58,70 +59,70 @@ if ('onhashchange' in window) {
 <span id="L2" class="LineNr"> 2 </span>
 <span id="L3" class="LineNr"> 3 </span><span class="muScenario">scenario</span> first_scenario_in_mu [
 <span id="L4" class="LineNr"> 4 </span>  run [
-<span id="L5" class="LineNr"> 5 </span>    10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L5" class="LineNr"> 5 </span>  <span class="Conceal">¦</span> 10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
 <span id="L6" class="LineNr"> 6 </span>  ]
 <span id="L7" class="LineNr"> 7 </span>  memory-should-contain [
-<span id="L8" class="LineNr"> 8 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L8" class="LineNr"> 8 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
 <span id="L9" class="LineNr"> 9 </span>  ]
 <span id="L10" class="LineNr">10 </span>]
 <span id="L11" class="LineNr">11 </span>
 <span id="L12" class="LineNr">12 </span><span class="muScenario">scenario</span> scenario_with_comment_in_mu [
 <span id="L13" class="LineNr">13 </span>  run [
-<span id="L14" class="LineNr">14 </span>    <span class="Comment"># comment</span>
-<span id="L15" class="LineNr">15 </span>    10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L14" class="LineNr">14 </span>  <span class="Conceal">¦</span> <span class="Comment"># comment</span>
+<span id="L15" class="LineNr">15 </span>  <span class="Conceal">¦</span> 10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
 <span id="L16" class="LineNr">16 </span>  ]
 <span id="L17" class="LineNr">17 </span>  memory-should-contain [
-<span id="L18" class="LineNr">18 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L18" class="LineNr">18 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
 <span id="L19" class="LineNr">19 </span>  ]
 <span id="L20" class="LineNr">20 </span>]
 <span id="L21" class="LineNr">21 </span>
 <span id="L22" class="LineNr">22 </span><span class="muScenario">scenario</span> scenario_with_multiple_comments_in_mu [
 <span id="L23" class="LineNr">23 </span>  run [
-<span id="L24" class="LineNr">24 </span>    <span class="Comment"># comment1</span>
-<span id="L25" class="LineNr">25 </span>    <span class="Comment"># comment2</span>
-<span id="L26" class="LineNr">26 </span>    10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L24" class="LineNr">24 </span>  <span class="Conceal">¦</span> <span class="Comment"># comment1</span>
+<span id="L25" class="LineNr">25 </span>  <span class="Conceal">¦</span> <span class="Comment"># comment2</span>
+<span id="L26" class="LineNr">26 </span>  <span class="Conceal">¦</span> 10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
 <span id="L27" class="LineNr">27 </span>  ]
 <span id="L28" class="LineNr">28 </span>  memory-should-contain [
-<span id="L29" class="LineNr">29 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L29" class="LineNr">29 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
 <span id="L30" class="LineNr">30 </span>  ]
 <span id="L31" class="LineNr">31 </span>]
 <span id="L32" class="LineNr">32 </span>
 <span id="L33" class="LineNr">33 </span><span class="muScenario">scenario</span> check_text_in_memory [
 <span id="L34" class="LineNr">34 </span>  run [
-<span id="L35" class="LineNr">35 </span>    10:num <span class="Special">&lt;-</span> copy<span class="Constant"> 3</span>
-<span id="L36" class="LineNr">36 </span>    11:char <span class="Special">&lt;-</span> copy<span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L37" class="LineNr">37 </span>    12:char <span class="Special">&lt;-</span> copy<span class="Constant"> 98</span>  <span class="Comment"># 'b'</span>
-<span id="L38" class="LineNr">38 </span>    13:char <span class="Special">&lt;-</span> copy<span class="Constant"> 99</span>  <span class="Comment"># 'c'</span>
+<span id="L35" class="LineNr">35 </span>  <span class="Conceal">¦</span> 10:num <span class="Special">&lt;-</span> copy<span class="Constant"> 3</span>
+<span id="L36" class="LineNr">36 </span>  <span class="Conceal">¦</span> 11:char <span class="Special">&lt;-</span> copy<span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L37" class="LineNr">37 </span>  <span class="Conceal">¦</span> 12:char <span class="Special">&lt;-</span> copy<span class="Constant"> 98</span>  <span class="Comment"># 'b'</span>
+<span id="L38" class="LineNr">38 </span>  <span class="Conceal">¦</span> 13:char <span class="Special">&lt;-</span> copy<span class="Constant"> 99</span>  <span class="Comment"># 'c'</span>
 <span id="L39" class="LineNr">39 </span>  ]
 <span id="L40" class="LineNr">40 </span>  memory-should-contain [
-<span id="L41" class="LineNr">41 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L41" class="LineNr">41 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L42" class="LineNr">42 </span>  ]
 <span id="L43" class="LineNr">43 </span>]
 <span id="L44" class="LineNr">44 </span>
 <span id="L45" class="LineNr">45 </span><span class="muScenario">scenario</span> check_trace [
 <span id="L46" class="LineNr">46 </span>  run [
-<span id="L47" class="LineNr">47 </span>    10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L47" class="LineNr">47 </span>  <span class="Conceal">¦</span> 10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
 <span id="L48" class="LineNr">48 </span>  ]
 <span id="L49" class="LineNr">49 </span>  trace-should-contain [
-<span id="L50" class="LineNr">50 </span>    mem: storing<span class="Constant"> 4</span> in location<span class="Constant"> 10</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Conceal">¦</span> mem: storing<span class="Constant"> 4</span> in location<span class="Constant"> 10</span>
 <span id="L51" class="LineNr">51 </span>  ]
 <span id="L52" class="LineNr">52 </span>]
 <span id="L53" class="LineNr">53 </span>
 <span id="L54" class="LineNr">54 </span><span class="muScenario">scenario</span> check_trace_negative [
 <span id="L55" class="LineNr">55 </span>  run [
-<span id="L56" class="LineNr">56 </span>    10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L56" class="LineNr">56 </span>  <span class="Conceal">¦</span> 10:num <span class="Special">&lt;-</span> add<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
 <span id="L57" class="LineNr">57 </span>  ]
 <span id="L58" class="LineNr">58 </span>  trace-should-not-contain [
-<span id="L59" class="LineNr">59 </span>    mem: storing<span class="Constant"> 3</span> in location<span class="Constant"> 10</span>
+<span id="L59" class="LineNr">59 </span>  <span class="Conceal">¦</span> mem: storing<span class="Constant"> 3</span> in location<span class="Constant"> 10</span>
 <span id="L60" class="LineNr">60 </span>  ]
 <span id="L61" class="LineNr">61 </span>]
 <span id="L62" class="LineNr">62 </span>
 <span id="L63" class="LineNr">63 </span><span class="muScenario">scenario</span> check_trace_instruction [
 <span id="L64" class="LineNr">64 </span>  run [
-<span id="L65" class="LineNr">65 </span>    trace<span class="Constant"> 1</span>, <span class="Constant">[foo]</span>, <span class="Constant">[aaa]</span>
+<span id="L65" class="LineNr">65 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 1</span>, <span class="Constant">[foo]</span>, <span class="Constant">[aaa]</span>
 <span id="L66" class="LineNr">66 </span>  ]
 <span id="L67" class="LineNr">67 </span>  trace-should-contain [
-<span id="L68" class="LineNr">68 </span>    foo: aaa
+<span id="L68" class="LineNr">68 </span>  <span class="Conceal">¦</span> foo: aaa
 <span id="L69" class="LineNr">69 </span>  ]
 <span id="L70" class="LineNr">70 </span>]
 </pre>
diff --git a/html/052tangle.cc.html b/html/052tangle.cc.html
index 2f67ef45..7cab85a1 100644
--- a/html/052tangle.cc.html
+++ b/html/052tangle.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
+.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .traceAbsent { color: #c00000; }
 .Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
-.traceContains { color: #008000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -105,31 +106,31 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr"> 43 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;before&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L44" class="LineNr"> 44 </span>  string label = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L45" class="LineNr"> 45 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L46" class="LineNr"> 46 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L47" class="LineNr"> 47 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'before' block at <a href='003trace.cc.html#L185'>end</a> of file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L48" class="LineNr"> 48 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'before' block at <a href='003trace.cc.html#L185'>end</a> of file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Delimiter">}</span>
 <span id="L50" class="LineNr"> 50 </span>  <a href='010vm.cc.html#L19'>recipe</a> tmp<span class="Delimiter">;</span>
 <span id="L51" class="LineNr"> 51 </span>  <a href='011load.cc.html#L81'>slurp_body</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='052tangle.cc.html#L13'>is_waypoint</a><span class="Delimiter">(</span>label<span class="Delimiter">))</span>
-<span id="L53" class="LineNr"> 53 </span>    Before_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>Before_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> Before_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>Before_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
 <span id="L54" class="LineNr"> 54 </span>  <span class="Normal">else</span>
-<span id="L55" class="LineNr"> 55 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't tangle before non-waypoint &quot;</span> &lt;&lt; label &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't tangle before non-waypoint &quot;</span> &lt;&lt; label &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Comment">// End before Command Handler</span>
 <span id="L57" class="LineNr"> 57 </span><span class="Delimiter">}</span>
 <span id="L58" class="LineNr"> 58 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>command == <span class="Constant">&quot;after&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L59" class="LineNr"> 59 </span>  string label = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>label<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L61" class="LineNr"> 61 </span>    assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L62" class="LineNr"> 62 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'after' block at <a href='003trace.cc.html#L185'>end</a> of file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'after' block at <a href='003trace.cc.html#L185'>end</a> of file</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Delimiter">}</span>
 <span id="L65" class="LineNr"> 65 </span>  <a href='010vm.cc.html#L19'>recipe</a> tmp<span class="Delimiter">;</span>
 <span id="L66" class="LineNr"> 66 </span>  <a href='011load.cc.html#L81'>slurp_body</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='052tangle.cc.html#L13'>is_waypoint</a><span class="Delimiter">(</span>label<span class="Delimiter">))</span>
-<span id="L68" class="LineNr"> 68 </span>    After_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>After_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> After_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>After_fragments[label]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> tmp<span class="Delimiter">.</span>steps<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
 <span id="L69" class="LineNr"> 69 </span>  <span class="Normal">else</span>
-<span id="L70" class="LineNr"> 70 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't tangle after non-waypoint &quot;</span> &lt;&lt; label &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;can't tangle after non-waypoint &quot;</span> &lt;&lt; label &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L71" class="LineNr"> 71 </span>  <span class="Comment">// End after Command Handler</span>
 <span id="L72" class="LineNr"> 72 </span><span class="Delimiter">}</span>
 <span id="L73" class="LineNr"> 73 </span>
@@ -156,34 +157,34 @@ if ('onhashchange' in window) {
 <span id="L94" class="LineNr"> 94 </span>  <span class="Normal">bool</span> made_progress = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Normal">int</span> pass = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L96" class="LineNr"> 96 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>made_progress<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L97" class="LineNr"> 97 </span>    made_progress = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L98" class="LineNr"> 98 </span>    <span class="Comment">// create a new vector because insertions invalidate iterators</span>
-<span id="L99" class="LineNr"> 99 </span>    vector&lt;instruction&gt; result<span class="Delimiter">;</span>
-<span id="L100" class="LineNr">100 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L101" class="LineNr">101 </span>      <span class="Normal">const</span> instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L102" class="LineNr">102 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>is_label || !is_waypoint<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">)</span> || inst<span class="Delimiter">.</span>tangle_done<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L103" class="LineNr">103 </span>        result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
-<span id="L104" class="LineNr">104 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L105" class="LineNr">105 </span>      <span class="Delimiter">}</span>
-<span id="L106" class="LineNr">106 </span>      inst<span class="Delimiter">.</span>tangle_done = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L107" class="LineNr">107 </span>      made_progress = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L108" class="LineNr">108 </span>      Fragments_used<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">);</span>
-<span id="L109" class="LineNr">109 </span>      ostringstream prefix<span class="Delimiter">;</span>
-<span id="L110" class="LineNr">110 </span>      prefix &lt;&lt; <span class="Constant">'+'</span> &lt;&lt; r<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; pass &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i<span class="Delimiter">;</span>
-<span id="L111" class="LineNr">111 </span>      <span class="Comment">// ok to use contains_key even though Before_fragments uses [],</span>
-<span id="L112" class="LineNr">112 </span>      <span class="Comment">// because appending an empty recipe is a noop</span>
-<span id="L113" class="LineNr">113 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Before_fragments<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr">114 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;insert fragments before label &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>label &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L115" class="LineNr">115 </span>        <a href='052tangle.cc.html#L128'>append_fragment</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> Before_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">,</span> prefix<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
-<span id="L116" class="LineNr">116 </span>      <span class="Delimiter">}</span>
-<span id="L117" class="LineNr">117 </span>      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
-<span id="L118" class="LineNr">118 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>After_fragments<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;insert fragments after label &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>label &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>        <a href='052tangle.cc.html#L128'>append_fragment</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> After_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">,</span> prefix<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
-<span id="L121" class="LineNr">121 </span>      <span class="Delimiter">}</span>
-<span id="L122" class="LineNr">122 </span>    <span class="Delimiter">}</span>
-<span id="L123" class="LineNr">123 </span>    r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
-<span id="L124" class="LineNr">124 </span>    ++pass<span class="Delimiter">;</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> made_progress = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Comment">// create a new vector because insertions invalidate iterators</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> vector&lt;instruction&gt; result<span class="Delimiter">;</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>is_label || !is_waypoint<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">)</span> || inst<span class="Delimiter">.</span>tangle_done<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>tangle_done = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> made_progress = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Fragments_used<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">);</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream prefix<span class="Delimiter">;</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> prefix &lt;&lt; <span class="Constant">'+'</span> &lt;&lt; r<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; pass &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i<span class="Delimiter">;</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// ok to use contains_key even though Before_fragments uses [],</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// because appending an empty recipe is a noop</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Before_fragments<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;insert fragments before label &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>label &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='052tangle.cc.html#L128'>append_fragment</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> Before_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">,</span> prefix<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>After_fragments<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;insert fragments after label &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>label &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='052tangle.cc.html#L128'>append_fragment</a><span class="Delimiter">(</span>result<span class="Delimiter">,</span> After_fragments[inst<span class="Delimiter">.</span>label]<span class="Delimiter">.</span>steps<span class="Delimiter">,</span> prefix<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> ++pass<span class="Delimiter">;</span>
 <span id="L125" class="LineNr">125 </span>  <span class="Delimiter">}</span>
 <span id="L126" class="LineNr">126 </span><span class="Delimiter">}</span>
 <span id="L127" class="LineNr">127 </span>
@@ -196,24 +197,24 @@ if ('onhashchange' in window) {
 <span id="L134" class="LineNr">134 </span>  <span class="Comment">// that introduces them.</span>
 <span id="L135" class="LineNr">135 </span>  set&lt;string&gt; jump_targets<span class="Delimiter">;</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>patch<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L137" class="LineNr">137 </span>    <span class="Normal">const</span> instruction&amp; inst = patch<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L138" class="LineNr">138 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label &amp;&amp; <a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span>
-<span id="L139" class="LineNr">139 </span>      jump_targets<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">);</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = patch<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label &amp;&amp; <a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> jump_targets<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>label<span class="Delimiter">);</span>
 <span id="L140" class="LineNr">140 </span>  <span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>patch<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L142" class="LineNr">142 </span>    <a href='010vm.cc.html#L32'>instruction</a> inst = patch<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L143" class="LineNr">143 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L144" class="LineNr">144 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>jump_targets<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span>
-<span id="L145" class="LineNr">145 </span>        inst<span class="Delimiter">.</span>label = prefix+inst<span class="Delimiter">.</span>label<span class="Delimiter">;</span>
-<span id="L146" class="LineNr">146 </span>      base<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
-<span id="L147" class="LineNr">147 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L148" class="LineNr">148 </span>    <span class="Delimiter">}</span>
-<span id="L149" class="LineNr">149 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L150" class="LineNr">150 </span>      reagent&amp; x = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
-<span id="L151" class="LineNr">151 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &amp;&amp; contains_key<span class="Delimiter">(</span>jump_targets<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
-<span id="L152" class="LineNr">152 </span>        x<span class="Delimiter">.</span>name = prefix+x<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
-<span id="L153" class="LineNr">153 </span>    <span class="Delimiter">}</span>
-<span id="L154" class="LineNr">154 </span>    base<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <a href='010vm.cc.html#L32'>instruction</a> inst = patch<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>jump_targets<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>label<span class="Delimiter">))</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>label = prefix+inst<span class="Delimiter">.</span>label<span class="Delimiter">;</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> base<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent&amp; x = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='041jump_target.cc.html#L11'>is_jump_target</a><span class="Delimiter">(</span>x<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &amp;&amp; contains_key<span class="Delimiter">(</span>jump_targets<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> x<span class="Delimiter">.</span>name = prefix+x<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> base<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
 <span id="L155" class="LineNr">155 </span>  <span class="Delimiter">}</span>
 <span id="L156" class="LineNr">156 </span><span class="Delimiter">}</span>
 <span id="L157" class="LineNr">157 </span>
@@ -228,12 +229,12 @@ if ('onhashchange' in window) {
 <span id="L166" class="LineNr">166 </span><span class="Delimiter">:(code)</span>
 <span id="L167" class="LineNr">167 </span><span class="Normal">void</span> <a href='052tangle.cc.html#L167'>check_insert_fragments</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> recipe&gt;::iterator p = Before_fragments<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Before_fragments<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L169" class="LineNr">169 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Fragments_used<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
-<span id="L170" class="LineNr">170 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;could not locate insert before label &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Fragments_used<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;could not locate insert before label &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L171" class="LineNr">171 </span>  <span class="Delimiter">}</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> recipe&gt;::iterator p = After_fragments<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != After_fragments<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L173" class="LineNr">173 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Fragments_used<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
-<span id="L174" class="LineNr">174 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;could not locate insert after label &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Fragments_used<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;could not locate insert after label &quot;</span> &lt;&lt; p<span class="Delimiter">-&gt;</span>first &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Delimiter">}</span>
 <span id="L176" class="LineNr">176 </span><span class="Delimiter">}</span>
 <span id="L177" class="LineNr">177 </span>
@@ -507,19 +508,19 @@ if ('onhashchange' in window) {
 <span id="L445" class="LineNr">445 </span><span class="Normal">void</span> <a href='052tangle.cc.html#L445'>test_new_fragment_after_tangle</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L446" class="LineNr">446 </span>  <span class="Comment">// define a recipe</span>
 <span id="L447" class="LineNr">447 </span>  load<span class="Delimiter">(</span><span class="Constant">&quot;def foo [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L448" class="LineNr">448 </span>       <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L449" class="LineNr">449 </span>       <span class="Constant">&quot;  &lt;label&gt;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L450" class="LineNr">450 </span>       <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L451" class="LineNr">451 </span>       <span class="Constant">&quot;after &lt;label&gt; [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L452" class="LineNr">452 </span>       <span class="Constant">&quot;  1:num/raw &lt;- copy 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L453" class="LineNr">453 </span>       <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;  &lt;label&gt;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L450" class="LineNr">450 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L451" class="LineNr">451 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;after &lt;label&gt; [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;  1:num/raw &lt;- copy 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L454" class="LineNr">454 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
 <span id="L455" class="LineNr">455 </span>  <a href='003trace.cc.html#L221'>CHECK_TRACE_DOESNT_CONTAIN_ERRORS</a><span class="Delimiter">();</span>
 <span id="L456" class="LineNr">456 </span>  Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L457" class="LineNr">457 </span>  <span class="Comment">// try to tangle into recipe foo after transform</span>
 <span id="L458" class="LineNr">458 </span>  load<span class="Delimiter">(</span><span class="Constant">&quot;before &lt;label&gt; [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L459" class="LineNr">459 </span>       <span class="Constant">&quot;  2:num/raw &lt;- copy 35</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L460" class="LineNr">460 </span>       <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;  2:num/raw &lt;- copy 35</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L461" class="LineNr">461 </span>  <a href='003trace.cc.html#L220'>CHECK_TRACE_CONTAINS_ERRORS</a><span class="Delimiter">();</span>
 <span id="L462" class="LineNr">462 </span><span class="Delimiter">}</span>
 <span id="L463" class="LineNr">463 </span>
diff --git a/html/053recipe_header.cc.html b/html/053recipe_header.cc.html
index 18b70394..84300629 100644
--- a/html/053recipe_header.cc.html
+++ b/html/053recipe_header.cc.html
@@ -19,15 +19,16 @@ a:hover { text-decoration: underline; }
 .muRecipe { color: #ff8700; }
 .LineNr { color: #444444; }
 .Error { color: #ffffff; background-color: #ff6060; padding-bottom: 1px; }
-.cSpecial { color: #008000; }
+.traceAbsent { color: #c00000; }
 .Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.traceContains { color: #008000; }
-.traceAbsent { color: #c00000; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .Special { color: #c00000; }
 .Identifier { color: #c0a020; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -96,29 +97,29 @@ if ('onhashchange' in window) {
 <span id="L32" class="LineNr"> 32 </span><span class="Normal">void</span> <a href='053recipe_header.cc.html#L32'>load_recipe_header</a><span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> recipe&amp; result<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L33" class="LineNr"> 33 </span>  result<span class="Delimiter">.</span>has_header = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'['</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L35" class="LineNr"> 35 </span>    string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L36" class="LineNr"> 36 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L37" class="LineNr"> 37 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L38" class="LineNr"> 38 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> header at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L39" class="LineNr"> 39 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L40" class="LineNr"> 40 </span>    <span class="Delimiter">}</span>
-<span id="L41" class="LineNr"> 41 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">)</span>
-<span id="L42" class="LineNr"> 42 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; should say '-&gt;' and not '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L44" class="LineNr"> 44 </span>    result<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>s<span class="Delimiter">));</span>
-<span id="L45" class="LineNr"> 45 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;header ingredient: &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>back<span class="Delimiter">().</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L46" class="LineNr"> 46 </span>    skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> header at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">)</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; should say '-&gt;' and not '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s == <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>s<span class="Delimiter">));</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;header ingredient: &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>back<span class="Delimiter">().</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'['</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L49" class="LineNr"> 49 </span>    string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L50" class="LineNr"> 50 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L51" class="LineNr"> 51 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L52" class="LineNr"> 52 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> header at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L53" class="LineNr"> 53 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L54" class="LineNr"> 54 </span>    <span class="Delimiter">}</span>
-<span id="L55" class="LineNr"> 55 </span>    result<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>s<span class="Delimiter">));</span>
-<span id="L56" class="LineNr"> 56 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;header product: &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>products<span class="Delimiter">.</span>back<span class="Delimiter">().</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L57" class="LineNr"> 57 </span>    skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> string s = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete <a href='010vm.cc.html#L19'>recipe</a> header at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>s<span class="Delimiter">));</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;header product: &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>products<span class="Delimiter">.</span>back<span class="Delimiter">().</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L58" class="LineNr"> 58 </span>  <span class="Delimiter">}</span>
 <span id="L59" class="LineNr"> 59 </span>  <span class="Comment">// End Load Recipe Header(result)</span>
 <span id="L60" class="LineNr"> 60 </span><span class="Delimiter">}</span>
@@ -201,15 +202,15 @@ if ('onhashchange' in window) {
 <span id="L137" class="LineNr">137 </span><span class="Normal">if</span> <span class="Delimiter">(</span>!result<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L138" class="LineNr">138 </span>  result<span class="Delimiter">.</span>has_header = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L140" class="LineNr">140 </span>    <span class="Normal">const</span> instruction&amp; inst = result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L141" class="LineNr">141 </span>    <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply&quot;</span> &amp;&amp; !inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L142" class="LineNr">142 </span>        || <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;return&quot;</span> &amp;&amp; !inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L143" class="LineNr">143 </span>        || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;next-ingredient&quot;</span>
-<span id="L144" class="LineNr">144 </span>        || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;ingredient&quot;</span>
-<span id="L145" class="LineNr">145 </span>        || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;rewind-ingredients&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L146" class="LineNr">146 </span>      result<span class="Delimiter">.</span>has_header = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L147" class="LineNr">147 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L148" class="LineNr">148 </span>    <span class="Delimiter">}</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">((</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply&quot;</span> &amp;&amp; !inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;return&quot;</span> &amp;&amp; !inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;next-ingredient&quot;</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;ingredient&quot;</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;rewind-ingredients&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>has_header = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Delimiter">}</span>
 <span id="L150" class="LineNr">150 </span><span class="Delimiter">}</span>
 <span id="L151" class="LineNr">151 </span><span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -244,11 +245,11 @@ if ('onhashchange' in window) {
 <span id="L180" class="LineNr">180 </span>  curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L181" class="LineNr">181 </span>  <a href='010vm.cc.html#L14'>recipe_ordinal</a> op = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;next-ingredient-without-typechecking&quot;</span><span class="Delimiter">);</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L183" class="LineNr">183 </span>    curr<span class="Delimiter">.</span>operation = op<span class="Delimiter">;</span>
-<span id="L184" class="LineNr">184 </span>    curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;next-ingredient-without-typechecking&quot;</span><span class="Delimiter">;</span>
-<span id="L185" class="LineNr">185 </span>    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L186" class="LineNr">186 </span>    result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
-<span id="L187" class="LineNr">187 </span>    curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>operation = op<span class="Delimiter">;</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;next-ingredient-without-typechecking&quot;</span><span class="Delimiter">;</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L188" class="LineNr">188 </span>  <span class="Delimiter">}</span>
 <span id="L189" class="LineNr">189 </span><span class="Delimiter">}</span>
 <span id="L190" class="LineNr">190 </span><span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;next-ingredient-without-typechecking&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -269,17 +270,17 @@ if ('onhashchange' in window) {
 <span id="L205" class="LineNr">205 </span><span class="Normal">case</span> NEXT_INGREDIENT_WITHOUT_TYPECHECKING: <span class="Delimiter">{</span>
 <span id="L206" class="LineNr">206 </span>  assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L208" class="LineNr">208 </span>    products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
-<span id="L209" class="LineNr">209 </span>        current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
-<span id="L210" class="LineNr">210 </span>    assert<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
-<span id="L211" class="LineNr">211 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L212" class="LineNr">212 </span>    ++current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> ++current_call<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Delimiter">}</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L215" class="LineNr">215 </span>    products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Comment">// pad the first product with sufficient zeros to match its type</span>
-<span id="L217" class="LineNr">217 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>resize<span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
-<span id="L218" class="LineNr">218 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Comment">// pad the first product with sufficient zeros to match its type</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>resize<span class="Delimiter">(</span>size_of<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L219" class="LineNr">219 </span>  <span class="Delimiter">}</span>
 <span id="L220" class="LineNr">220 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr">221 </span><span class="Delimiter">}</span>
@@ -315,8 +316,8 @@ if ('onhashchange' in window) {
 <span id="L251" class="LineNr">251 </span><span class="Delimiter">:(code)</span>
 <span id="L252" class="LineNr">252 </span><span class="Normal">bool</span> is_present_in_ingredients<span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; callee<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L253" class="LineNr">253 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L254" class="LineNr">254 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
-<span id="L255" class="LineNr">255 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L256" class="LineNr">256 </span>  <span class="Delimiter">}</span>
 <span id="L257" class="LineNr">257 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L258" class="LineNr">258 </span><span class="Delimiter">}</span>
@@ -354,21 +355,21 @@ if ('onhashchange' in window) {
 <span id="L290" class="LineNr">290 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L291" class="LineNr">291 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- type-check calls inside <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L292" class="LineNr">292 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L293" class="LineNr">293 </span>    <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L294" class="LineNr">294 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation &lt; <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L295" class="LineNr">295 </span>    <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
-<span id="L296" class="LineNr">296 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L297" class="LineNr">297 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L298" class="LineNr">298 </span>      <span class="Comment">// ingredients coerced from call to callee</span>
-<span id="L299" class="LineNr">299 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L300" class="LineNr">300 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L301" class="LineNr">301 </span>    <span class="Delimiter">}</span>
-<span id="L302" class="LineNr">302 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L303" class="LineNr">303 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L304" class="LineNr">304 </span>      <span class="Comment">// products coerced from callee to call</span>
-<span id="L305" class="LineNr">305 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L306" class="LineNr">306 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L307" class="LineNr">307 </span>    <span class="Delimiter">}</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation &lt; <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// ingredients coerced from call to callee</span>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// products coerced from callee to call</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L308" class="LineNr">308 </span>  <span class="Delimiter">}</span>
 <span id="L309" class="LineNr">309 </span><span class="Delimiter">}</span>
 <span id="L310" class="LineNr">310 </span>
@@ -394,16 +395,16 @@ if ('onhashchange' in window) {
 <span id="L330" class="LineNr">330 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_recipe<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L331" class="LineNr">331 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- checking return instructions against header for &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L332" class="LineNr">332 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L333" class="LineNr">333 </span>    <span class="Normal">const</span> instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L334" class="LineNr">334 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;reply&quot;</span> &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;return&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L335" class="LineNr">335 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L336" class="LineNr">336 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replied with the wrong number of products at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L337" class="LineNr">337 </span>      <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L338" class="LineNr">338 </span>    <span class="Delimiter">}</span>
-<span id="L339" class="LineNr">339 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L340" class="LineNr">340 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L341" class="LineNr">341 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replied with the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L342" class="LineNr">342 </span>    <span class="Delimiter">}</span>
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;reply&quot;</span> &amp;&amp; inst<span class="Delimiter">.</span>name != <span class="Constant">&quot;return&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replied with the wrong number of products at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replied with the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L343" class="LineNr">343 </span>  <span class="Delimiter">}</span>
 <span id="L344" class="LineNr">344 </span><span class="Delimiter">}</span>
 <span id="L345" class="LineNr">345 </span>
@@ -465,11 +466,11 @@ if ('onhashchange' in window) {
 <span id="L401" class="LineNr">401 </span>  caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L402" class="LineNr">402 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- checking return instructions against header for &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L403" class="LineNr">403 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L404" class="LineNr">404 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span>
-<span id="L405" class="LineNr">405 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient '&quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' has no type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L406" class="LineNr">406 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span>
-<span id="L407" class="LineNr">407 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' can't repeat in the ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L408" class="LineNr">408 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
+<span id="L404" class="LineNr">404 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span>
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient '&quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' has no type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' can't repeat in the ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
 <span id="L409" class="LineNr">409 </span>  <span class="Delimiter">}</span>
 <span id="L410" class="LineNr">410 </span><span class="Delimiter">}</span>
 <span id="L411" class="LineNr">411 </span>
@@ -498,35 +499,35 @@ if ('onhashchange' in window) {
 <span id="L434" class="LineNr">434 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- deduce types from header for &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L435" class="LineNr">435 </span>  map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt; header_type<span class="Delimiter">;</span>
 <span id="L436" class="LineNr">436 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L437" class="LineNr">437 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
-<span id="L438" class="LineNr">438 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L439" class="LineNr">439 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L437" class="LineNr">437 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
+<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L440" class="LineNr">440 </span>  <span class="Delimiter">}</span>
 <span id="L441" class="LineNr">441 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L442" class="LineNr">442 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
-<span id="L443" class="LineNr">443 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L444" class="LineNr">444 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
+<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L444" class="LineNr">444 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L445" class="LineNr">445 </span>  <span class="Delimiter">}</span>
 <span id="L446" class="LineNr">446 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L447" class="LineNr">447 </span>    instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L448" class="LineNr">448 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L449" class="LineNr">449 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L450" class="LineNr">450 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L451" class="LineNr">451 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>header_type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> == header_type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
-<span id="L452" class="LineNr">452 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L453" class="LineNr">453 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
-<span id="L454" class="LineNr">454 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L455" class="LineNr">455 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L456" class="LineNr">456 </span>    <span class="Delimiter">}</span>
-<span id="L457" class="LineNr">457 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L458" class="LineNr">458 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  product: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L459" class="LineNr">459 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L460" class="LineNr">460 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>header_type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> == header_type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
-<span id="L461" class="LineNr">461 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L462" class="LineNr">462 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
-<span id="L463" class="LineNr">463 </span>      inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L464" class="LineNr">464 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L465" class="LineNr">465 </span>    <span class="Delimiter">}</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L450" class="LineNr">450 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L451" class="LineNr">451 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>header_type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> == header_type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
+<span id="L454" class="LineNr">454 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L455" class="LineNr">455 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L457" class="LineNr">457 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  product: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>header_type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> == header_type<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>header_type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type of &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L466" class="LineNr">466 </span>  <span class="Delimiter">}</span>
 <span id="L467" class="LineNr">467 </span><span class="Delimiter">}</span>
 <span id="L468" class="LineNr">468 </span>
@@ -554,18 +555,18 @@ if ('onhashchange' in window) {
 <span id="L490" class="LineNr">490 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_recipe<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L491" class="LineNr">491 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- fill in return ingredients from header for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L492" class="LineNr">492 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L493" class="LineNr">493 </span>    instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L494" class="LineNr">494 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;return&quot;</span><span class="Delimiter">)</span>
-<span id="L495" class="LineNr">495 </span>      add_header_products<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;return&quot;</span><span class="Delimiter">)</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> add_header_products<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Delimiter">}</span>
 <span id="L497" class="LineNr">497 </span>  <span class="Comment">// fall through return</span>
 <span id="L498" class="LineNr">498 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// error will be raised elsewhere if there's a product in the header; just give up</span>
 <span id="L499" class="LineNr">499 </span>  <span class="Normal">const</span> instruction&amp; final_instruction = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L500" class="LineNr">500 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>final_instruction<span class="Delimiter">.</span>name != <span class="Constant">&quot;reply&quot;</span> &amp;&amp; final_instruction<span class="Delimiter">.</span>name != <span class="Constant">&quot;return&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L501" class="LineNr">501 </span>    <a href='010vm.cc.html#L32'>instruction</a> inst<span class="Delimiter">;</span>
-<span id="L502" class="LineNr">502 </span>    inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;return&quot;</span><span class="Delimiter">;</span>
-<span id="L503" class="LineNr">503 </span>    add_header_products<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
-<span id="L504" class="LineNr">504 </span>    caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L501" class="LineNr">501 </span>  <span class="Conceal">¦</span> <a href='010vm.cc.html#L32'>instruction</a> inst<span class="Delimiter">;</span>
+<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>name = <span class="Constant">&quot;return&quot;</span><span class="Delimiter">;</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span> add_header_products<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
+<span id="L504" class="LineNr">504 </span>  <span class="Conceal">¦</span> caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
 <span id="L505" class="LineNr">505 </span>  <span class="Delimiter">}</span>
 <span id="L506" class="LineNr">506 </span><span class="Delimiter">}</span>
 <span id="L507" class="LineNr">507 </span>
@@ -573,15 +574,15 @@ if ('onhashchange' in window) {
 <span id="L509" class="LineNr">509 </span>  assert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;reply&quot;</span> || inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;return&quot;</span><span class="Delimiter">);</span>
 <span id="L510" class="LineNr">510 </span>  <span class="Comment">// collect any products with the same names as ingredients</span>
 <span id="L511" class="LineNr">511 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L512" class="LineNr">512 </span>    <span class="Comment">// if the ingredient is missing, add it from the header</span>
-<span id="L513" class="LineNr">513 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> == i<span class="Delimiter">)</span>
-<span id="L514" class="LineNr">514 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L515" class="LineNr">515 </span>    <span class="Comment">// if it's missing /same_as_ingredient, try to fill it in</span>
-<span id="L516" class="LineNr">516 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &amp;&amp; !has_property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same_as_ingredient&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L517" class="LineNr">517 </span>      ostringstream same_as_ingredient<span class="Delimiter">;</span>
-<span id="L518" class="LineNr">518 </span>      same_as_ingredient &lt;&lt; get<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
-<span id="L519" class="LineNr">519 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">,</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>same_as_ingredient<span class="Delimiter">.</span>str<span class="Delimiter">())));</span>
-<span id="L520" class="LineNr">520 </span>    <span class="Delimiter">}</span>
+<span id="L512" class="LineNr">512 </span>  <span class="Conceal">¦</span> <span class="Comment">// if the ingredient is missing, add it from the header</span>
+<span id="L513" class="LineNr">513 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> == i<span class="Delimiter">)</span>
+<span id="L514" class="LineNr">514 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L515" class="LineNr">515 </span>  <span class="Conceal">¦</span> <span class="Comment">// if it's missing /same_as_ingredient, try to fill it in</span>
+<span id="L516" class="LineNr">516 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &amp;&amp; !has_property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;same_as_ingredient&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L517" class="LineNr">517 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream same_as_ingredient<span class="Delimiter">;</span>
+<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> same_as_ingredient &lt;&lt; get<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>ingredient_index<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L519" class="LineNr">519 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;same-as-ingredient&quot;</span><span class="Delimiter">,</span> <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>same_as_ingredient<span class="Delimiter">.</span>str<span class="Delimiter">())));</span>
+<span id="L520" class="LineNr">520 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L521" class="LineNr">521 </span>  <span class="Delimiter">}</span>
 <span id="L522" class="LineNr">522 </span><span class="Delimiter">}</span>
 <span id="L523" class="LineNr">523 </span>
@@ -680,16 +681,16 @@ if ('onhashchange' in window) {
 <span id="L616" class="LineNr">616 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L617" class="LineNr">617 </span>  reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> expected_ingredient<span class="Delimiter">(</span><span class="Constant">&quot;x:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">);</span>
 <span id="L618" class="LineNr">618 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L619" class="LineNr">619 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L620" class="LineNr">620 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;ingredients of <a href='010vm.cc.html#L19'>recipe</a> 'main' must all be text (address:array:character)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L621" class="LineNr">621 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L622" class="LineNr">622 </span>    <span class="Delimiter">}</span>
+<span id="L619" class="LineNr">619 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L620" class="LineNr">620 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;ingredients of <a href='010vm.cc.html#L19'>recipe</a> 'main' must all be text (address:array:character)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L621" class="LineNr">621 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L622" class="LineNr">622 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L623" class="LineNr">623 </span>  <span class="Delimiter">}</span>
 <span id="L624" class="LineNr">624 </span>  <span class="Normal">int</span> nprod = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span>
 <span id="L625" class="LineNr">625 </span>  reagent<span class="Comment">/*</span><span class="Comment">local</span><span class="Comment">*/</span> expected_product<span class="Delimiter">(</span><span class="Constant">&quot;x:number&quot;</span><span class="Delimiter">);</span>
 <span id="L626" class="LineNr">626 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>nprod &gt; <span class="Constant">1</span>
-<span id="L627" class="LineNr">627 </span>      || <span class="Delimiter">(</span>nprod == <span class="Constant">1</span> &amp;&amp; !types_strictly_match<span class="Delimiter">(</span>expected_product<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))))</span> <span class="Delimiter">{</span>
-<span id="L628" class="LineNr">628 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;recipe 'main' must return at most a single product, a number</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L627" class="LineNr">627 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> || <span class="Delimiter">(</span>nprod == <span class="Constant">1</span> &amp;&amp; !types_strictly_match<span class="Delimiter">(</span>expected_product<span class="Delimiter">,</span> caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))))</span> <span class="Delimiter">{</span>
+<span id="L628" class="LineNr">628 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;recipe 'main' must return at most a single product, a number</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L629" class="LineNr">629 </span>  <span class="Delimiter">}</span>
 <span id="L630" class="LineNr">630 </span><span class="Delimiter">}</span>
 <span id="L631" class="LineNr">631 </span>
diff --git a/html/054static_dispatch.cc.html b/html/054static_dispatch.cc.html
index 6b607ad0..6479384a 100644
--- a/html/054static_dispatch.cc.html
+++ b/html/054static_dispatch.cc.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.traceAbsent { color: #c00000; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.traceAbsent { color: #c00000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
 -->
 </style>
@@ -97,16 +98,16 @@ if ('onhashchange' in window) {
 <span id="L34" class="LineNr"> 34 </span><span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name != <span class="Constant">&quot;main&quot;</span> &amp;&amp; contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L37" class="LineNr"> 37 </span>    string new_name = <a href='054static_dispatch.cc.html#L56'>matching_variant_name</a><span class="Delimiter">(</span>result<span class="Delimiter">);</span>
-<span id="L38" class="LineNr"> 38 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>new_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L39" class="LineNr"> 39 </span>      <span class="Comment">// variant doesn't already exist</span>
-<span id="L40" class="LineNr"> 40 </span>      new_name = <a href='054static_dispatch.cc.html#L111'>next_unused_recipe_name</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
-<span id="L41" class="LineNr"> 41 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> new_name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
-<span id="L42" class="LineNr"> 42 </span>      <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> new_name<span class="Delimiter">));</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Delimiter">}</span>
-<span id="L44" class="LineNr"> 44 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;switching &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; new_name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L45" class="LineNr"> 45 </span>    result<span class="Delimiter">.</span>name = new_name<span class="Delimiter">;</span>
-<span id="L46" class="LineNr"> 46 </span>    result<span class="Delimiter">.</span>is_autogenerated = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> string new_name = <a href='054static_dispatch.cc.html#L56'>matching_variant_name</a><span class="Delimiter">(</span>result<span class="Delimiter">);</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>new_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// variant doesn't already exist</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> new_name = <a href='054static_dispatch.cc.html#L111'>next_unused_recipe_name</a><span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> new_name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> new_name<span class="Delimiter">));</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;switching &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; new_name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>name = new_name<span class="Delimiter">;</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>is_autogenerated = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span><span class="Delimiter">}</span>
 <span id="L49" class="LineNr"> 49 </span><span class="Normal">else</span> <span class="Delimiter">{</span>
@@ -119,10 +120,10 @@ if ('onhashchange' in window) {
 <span id="L56" class="LineNr"> 56 </span>string <a href='054static_dispatch.cc.html#L56'>matching_variant_name</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; rr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L57" class="LineNr"> 57 </span>  <span class="Normal">const</span> vector&lt;recipe_ordinal&gt;&amp; variants = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> rr<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
 <span id="L58" class="LineNr"> 58 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L59" class="LineNr"> 59 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L60" class="LineNr"> 60 </span>    <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L61" class="LineNr"> 61 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_reagents_match<span class="Delimiter">(</span>rr<span class="Delimiter">,</span> candidate<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L62" class="LineNr"> 62 </span>    <span class="Identifier">return</span> candidate<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!all_reagents_match<span class="Delimiter">(</span>rr<span class="Delimiter">,</span> candidate<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> candidate<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Delimiter">}</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
 <span id="L65" class="LineNr"> 65 </span><span class="Delimiter">}</span>
@@ -131,16 +132,16 @@ if ('onhashchange' in window) {
 <span id="L68" class="LineNr"> 68 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L69" class="LineNr"> 69 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r2<span class="Delimiter">.</span>products<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L70" class="LineNr"> 70 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>    expand_type_abbreviations<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>    expand_type_abbreviations<span class="Delimiter">(</span>r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L74" class="LineNr"> 74 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Delimiter">}</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L77" class="LineNr"> 77 </span>    expand_type_abbreviations<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L78" class="LineNr"> 78 </span>    expand_type_abbreviations<span class="Delimiter">(</span>r2<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> r2<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L80" class="LineNr"> 80 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> expand_type_abbreviations<span class="Delimiter">(</span>r2<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> r2<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L81" class="LineNr"> 81 </span>  <span class="Delimiter">}</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L83" class="LineNr"> 83 </span><span class="Delimiter">}</span>
@@ -159,24 +160,24 @@ if ('onhashchange' in window) {
 <span id="L96" class="LineNr"> 96 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!b<span class="Delimiter">)</span> <span class="Identifier">return</span> !a<span class="Delimiter">;</span>
 <span id="L97" class="LineNr"> 97 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>atom != b<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L98" class="LineNr"> 98 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span> &amp;&amp; b<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
-<span id="L100" class="LineNr">100 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
-<span id="L102" class="LineNr">102 </span>      <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>b<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L103" class="LineNr">103 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>b<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
-<span id="L104" class="LineNr">104 </span>      <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L105" class="LineNr">105 </span>    <span class="Identifier">return</span> a<span class="Delimiter">-&gt;</span>name == b<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span> &amp;&amp; b<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>b<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>b<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> a<span class="Delimiter">-&gt;</span>name == b<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
 <span id="L106" class="LineNr">106 </span>  <span class="Delimiter">}</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Identifier">return</span> deeply_equal_type_names<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> b<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
-<span id="L108" class="LineNr">108 </span>      &amp;&amp; deeply_equal_type_names<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> b<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; deeply_equal_type_names<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> b<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
 <span id="L109" class="LineNr">109 </span><span class="Delimiter">}</span>
 <span id="L110" class="LineNr">110 </span>
 <span id="L111" class="LineNr">111 </span>string <a href='054static_dispatch.cc.html#L111'>next_unused_recipe_name</a><span class="Delimiter">(</span><span class="Normal">const</span> string&amp; recipe_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">2</span><span class="Delimiter">;</span>  <span class="Comment">/*</span><span class="Comment">forever</span><span class="Comment">*/</span><span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L113" class="LineNr">113 </span>    ostringstream out<span class="Delimiter">;</span>
-<span id="L114" class="LineNr">114 </span>    out &lt;&lt; recipe_name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i<span class="Delimiter">;</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> out<span class="Delimiter">.</span>str<span class="Delimiter">()))</span>
-<span id="L116" class="LineNr">116 </span>      <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> ostringstream out<span class="Delimiter">;</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> out &lt;&lt; recipe_name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i<span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> out<span class="Delimiter">.</span>str<span class="Delimiter">()))</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Delimiter">}</span>
 <span id="L118" class="LineNr">118 </span><span class="Delimiter">}</span>
 <span id="L119" class="LineNr">119 </span>
@@ -220,18 +221,18 @@ if ('onhashchange' in window) {
 <span id="L157" class="LineNr">157 </span>  recipe&amp; caller_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L158" class="LineNr">158 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- resolve ambiguous calls for <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L160" class="LineNr">160 </span>    instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L161" class="LineNr">161 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L162" class="LineNr">162 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L370'>non_ghost_size</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">))</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L163" class="LineNr">163 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L164" class="LineNr">164 </span>    Resolve_stack<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>r<span class="Delimiter">));</span>
-<span id="L165" class="LineNr">165 </span>    Resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index = index<span class="Delimiter">;</span>
-<span id="L166" class="LineNr">166 </span>    string new_name = best_variant<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!new_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L168" class="LineNr">168 </span>      inst<span class="Delimiter">.</span>name = new_name<span class="Delimiter">;</span>
-<span id="L169" class="LineNr">169 </span>    assert<span class="Delimiter">(</span>Resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe == r<span class="Delimiter">);</span>
-<span id="L170" class="LineNr">170 </span>    assert<span class="Delimiter">(</span>Resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index == index<span class="Delimiter">);</span>
-<span id="L171" class="LineNr">171 </span>    Resolve_stack<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L370'>non_ghost_size</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">))</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> Resolve_stack<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>r<span class="Delimiter">));</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> Resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index = index<span class="Delimiter">;</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> string new_name = best_variant<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!new_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>name = new_name<span class="Delimiter">;</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe == r<span class="Delimiter">);</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index == index<span class="Delimiter">);</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> Resolve_stack<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Delimiter">}</span>
 <span id="L173" class="LineNr">173 </span><span class="Delimiter">}</span>
 <span id="L174" class="LineNr">174 </span>
@@ -261,25 +262,25 @@ if ('onhashchange' in window) {
 <span id="L198" class="LineNr">198 </span>
 <span id="L199" class="LineNr">199 </span>  <span class="Comment">// error messages</span>
 <span id="L200" class="LineNr">200 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &gt;= <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// we currently don't check types for primitive variants</span>
-<span id="L201" class="LineNr">201 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to find a matching call for '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L202" class="LineNr">202 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>list&lt;call&gt;::iterator p = <span class="Comment">/*</span><span class="Comment">skip</span><span class="Comment">*/</span>++Resolve_stack<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Resolve_stack<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L203" class="LineNr">203 </span>      <span class="Normal">const</span> recipe&amp; specializer_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">);</span>
-<span id="L204" class="LineNr">204 </span>      <span class="Normal">const</span> instruction&amp; specializer_inst = specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>running_step_index<span class="Delimiter">);</span>
-<span id="L205" class="LineNr">205 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>name != <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>
-<span id="L206" class="LineNr">206 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (from '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>specializer_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' in &quot;</span> &lt;&lt; specializer_recipe<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L207" class="LineNr">207 </span>      <span class="Normal">else</span>
-<span id="L208" class="LineNr">208 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (from '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>specializer_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L209" class="LineNr">209 </span>      <span class="Comment">// One special-case to help with the rewrite_stash transform. (cross-layer)</span>
-<span id="L210" class="LineNr">210 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;stash_&quot;</span><span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L211" class="LineNr">211 </span>        <a href='010vm.cc.html#L32'>instruction</a> stash_inst<span class="Delimiter">;</span>
-<span id="L212" class="LineNr">212 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L377'>next_stash</a><span class="Delimiter">(</span>*p<span class="Delimiter">,</span> &amp;stash_inst<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L213" class="LineNr">213 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>name != <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>
-<span id="L214" class="LineNr">214 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (part of '&quot;</span> &lt;&lt; stash_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' in &quot;</span> &lt;&lt; specializer_recipe<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L215" class="LineNr">215 </span>          <span class="Normal">else</span>
-<span id="L216" class="LineNr">216 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (part of '&quot;</span> &lt;&lt; stash_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L217" class="LineNr">217 </span>        <span class="Delimiter">}</span>
-<span id="L218" class="LineNr">218 </span>      <span class="Delimiter">}</span>
-<span id="L219" class="LineNr">219 </span>    <span class="Delimiter">}</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to find a matching call for '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>list&lt;call&gt;::iterator p = <span class="Comment">/*</span><span class="Comment">skip</span><span class="Comment">*/</span>++Resolve_stack<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != Resolve_stack<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; specializer_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">);</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; specializer_inst = specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>running_step_index<span class="Delimiter">);</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>name != <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (from '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>specializer_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' in &quot;</span> &lt;&lt; specializer_recipe<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (from '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>specializer_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// One special-case to help with the rewrite_stash transform. (cross-layer)</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;stash_&quot;</span><span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='010vm.cc.html#L32'>instruction</a> stash_inst<span class="Delimiter">;</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L377'>next_stash</a><span class="Delimiter">(</span>*p<span class="Delimiter">,</span> &amp;stash_inst<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>name != <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (part of '&quot;</span> &lt;&lt; stash_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' in &quot;</span> &lt;&lt; specializer_recipe<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (part of '&quot;</span> &lt;&lt; stash_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L220" class="LineNr">220 </span>  <span class="Delimiter">}</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
 <span id="L222" class="LineNr">222 </span><span class="Delimiter">}</span>
@@ -288,27 +289,27 @@ if ('onhashchange' in window) {
 <span id="L225" class="LineNr">225 </span>vector&lt;recipe_ordinal&gt; <a href='054static_dispatch.cc.html#L225'>strictly_matching_variants</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L226" class="LineNr">226 </span>  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
 <span id="L227" class="LineNr">227 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L228" class="LineNr">228 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L229" class="LineNr">229 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L230" class="LineNr">230 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L236'>all_header_reagents_strictly_match</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
-<span id="L231" class="LineNr">231 </span>      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L236'>all_header_reagents_strictly_match</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L232" class="LineNr">232 </span>  <span class="Delimiter">}</span>
 <span id="L233" class="LineNr">233 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L234" class="LineNr">234 </span><span class="Delimiter">}</span>
 <span id="L235" class="LineNr">235 </span>
 <span id="L236" class="LineNr">236 </span><span class="Normal">bool</span> <a href='054static_dispatch.cc.html#L236'>all_header_reagents_strictly_match</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L237" class="LineNr">237 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L238" class="LineNr">238 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L239" class="LineNr">239 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L240" class="LineNr">240 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L241" class="LineNr">241 </span>    <span class="Delimiter">}</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L242" class="LineNr">242 </span>  <span class="Delimiter">}</span>
 <span id="L243" class="LineNr">243 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L244" class="LineNr">244 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L245" class="LineNr">245 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L246" class="LineNr">246 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L247" class="LineNr">247 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L248" class="LineNr">248 </span>    <span class="Delimiter">}</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L249" class="LineNr">249 </span>  <span class="Delimiter">}</span>
 <span id="L250" class="LineNr">250 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L251" class="LineNr">251 </span><span class="Delimiter">}</span>
@@ -317,34 +318,34 @@ if ('onhashchange' in window) {
 <span id="L254" class="LineNr">254 </span>vector&lt;recipe_ordinal&gt; <a href='054static_dispatch.cc.html#L254'>strictly_matching_variants_except_literal_zero_against_address</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L255" class="LineNr">255 </span>  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
 <span id="L256" class="LineNr">256 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L257" class="LineNr">257 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L258" class="LineNr">258 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict except literal-zero-against-address) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L259" class="LineNr">259 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L265'>all_header_reagents_strictly_match_except_literal_zero_against_address</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
-<span id="L260" class="LineNr">260 </span>      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict except literal-zero-against-address) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L265'>all_header_reagents_strictly_match_except_literal_zero_against_address</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L261" class="LineNr">261 </span>  <span class="Delimiter">}</span>
 <span id="L262" class="LineNr">262 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L263" class="LineNr">263 </span><span class="Delimiter">}</span>
 <span id="L264" class="LineNr">264 </span>
 <span id="L265" class="LineNr">265 </span><span class="Normal">bool</span> <a href='054static_dispatch.cc.html#L265'>all_header_reagents_strictly_match_except_literal_zero_against_address</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L266" class="LineNr">266 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L267" class="LineNr">267 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_zero_against_address<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L268" class="LineNr">268 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L269" class="LineNr">269 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L270" class="LineNr">270 </span>    <span class="Delimiter">}</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_zero_against_address<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L271" class="LineNr">271 </span>  <span class="Delimiter">}</span>
 <span id="L272" class="LineNr">272 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L273" class="LineNr">273 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L274" class="LineNr">274 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L275" class="LineNr">275 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L276" class="LineNr">276 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L277" class="LineNr">277 </span>    <span class="Delimiter">}</span>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L275" class="LineNr">275 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L278" class="LineNr">278 </span>  <span class="Delimiter">}</span>
 <span id="L279" class="LineNr">279 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L280" class="LineNr">280 </span><span class="Delimiter">}</span>
 <span id="L281" class="LineNr">281 </span>
 <span id="L282" class="LineNr">282 </span><span class="Normal">bool</span> types_strictly_match_except_literal_zero_against_address<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L283" class="LineNr">283 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span>
-<span id="L284" class="LineNr">284 </span>    <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
 <span id="L285" class="LineNr">285 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">);</span>
 <span id="L286" class="LineNr">286 </span><span class="Delimiter">}</span>
 <span id="L287" class="LineNr">287 </span>
@@ -352,34 +353,34 @@ if ('onhashchange' in window) {
 <span id="L289" class="LineNr">289 </span>vector&lt;recipe_ordinal&gt; <a href='054static_dispatch.cc.html#L289'>strictly_matching_variants_except_literal_against_address_or_boolean</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L290" class="LineNr">290 </span>  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
 <span id="L291" class="LineNr">291 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L292" class="LineNr">292 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L293" class="LineNr">293 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict except literal-against-boolean) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L294" class="LineNr">294 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L300'>all_header_reagents_strictly_match_except_literal_against_address_or_boolean</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
-<span id="L295" class="LineNr">295 </span>      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict except literal-against-boolean) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L300'>all_header_reagents_strictly_match_except_literal_against_address_or_boolean</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L296" class="LineNr">296 </span>  <span class="Delimiter">}</span>
 <span id="L297" class="LineNr">297 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L298" class="LineNr">298 </span><span class="Delimiter">}</span>
 <span id="L299" class="LineNr">299 </span>
 <span id="L300" class="LineNr">300 </span><span class="Normal">bool</span> <a href='054static_dispatch.cc.html#L300'>all_header_reagents_strictly_match_except_literal_against_address_or_boolean</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L301" class="LineNr">301 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L302" class="LineNr">302 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_against_address_or_boolean<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L303" class="LineNr">303 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L304" class="LineNr">304 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L305" class="LineNr">305 </span>    <span class="Delimiter">}</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_against_address_or_boolean<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L306" class="LineNr">306 </span>  <span class="Delimiter">}</span>
 <span id="L307" class="LineNr">307 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L308" class="LineNr">308 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L309" class="LineNr">309 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_against_address_or_boolean<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L310" class="LineNr">310 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L311" class="LineNr">311 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L312" class="LineNr">312 </span>    <span class="Delimiter">}</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_against_address_or_boolean<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L310" class="LineNr">310 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L313" class="LineNr">313 </span>  <span class="Delimiter">}</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L315" class="LineNr">315 </span><span class="Delimiter">}</span>
 <span id="L316" class="LineNr">316 </span>
 <span id="L317" class="LineNr">317 </span><span class="Normal">bool</span> <a href='054static_dispatch.cc.html#L317'>types_strictly_match_except_literal_against_address_or_boolean</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L318" class="LineNr">318 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L200'>is_mu_boolean</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span>
-<span id="L319" class="LineNr">319 </span>    <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
 <span id="L320" class="LineNr">320 </span>  <span class="Identifier">return</span> types_strictly_match_except_literal_zero_against_address<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">);</span>
 <span id="L321" class="LineNr">321 </span><span class="Delimiter">}</span>
 <span id="L322" class="LineNr">322 </span>
@@ -387,27 +388,27 @@ if ('onhashchange' in window) {
 <span id="L324" class="LineNr">324 </span>vector&lt;recipe_ordinal&gt; <a href='054static_dispatch.cc.html#L324'>matching_variants</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L325" class="LineNr">325 </span>  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
 <span id="L326" class="LineNr">326 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L327" class="LineNr">327 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L328" class="LineNr">328 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L329" class="LineNr">329 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L335'>all_header_reagents_match</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
-<span id="L330" class="LineNr">330 </span>      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='054static_dispatch.cc.html#L335'>all_header_reagents_match</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
+<span id="L330" class="LineNr">330 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L331" class="LineNr">331 </span>  <span class="Delimiter">}</span>
 <span id="L332" class="LineNr">332 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L333" class="LineNr">333 </span><span class="Delimiter">}</span>
 <span id="L334" class="LineNr">334 </span>
 <span id="L335" class="LineNr">335 </span><span class="Normal">bool</span> <a href='054static_dispatch.cc.html#L335'>all_header_reagents_match</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L336" class="LineNr">336 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L337" class="LineNr">337 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L338" class="LineNr">338 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L339" class="LineNr">339 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L340" class="LineNr">340 </span>    <span class="Delimiter">}</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L341" class="LineNr">341 </span>  <span class="Delimiter">}</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L343" class="LineNr">343 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L344" class="LineNr">344 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L345" class="LineNr">345 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L346" class="LineNr">346 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L347" class="LineNr">347 </span>    <span class="Delimiter">}</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L344" class="LineNr">344 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L348" class="LineNr">348 </span>  <span class="Delimiter">}</span>
 <span id="L349" class="LineNr">349 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L350" class="LineNr">350 </span><span class="Delimiter">}</span>
@@ -418,14 +419,14 @@ if ('onhashchange' in window) {
 <span id="L355" class="LineNr">355 </span>  <span class="Normal">int</span> min_score = <span class="Constant">999</span><span class="Delimiter">;</span>
 <span id="L356" class="LineNr">356 </span>  <span class="Normal">int</span> min_index = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L357" class="LineNr">357 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidates<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L358" class="LineNr">358 </span>    <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L359" class="LineNr">359 </span>    <span class="Normal">int</span> score = abs<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>products<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
-<span id="L360" class="LineNr">360 </span>                          + abs<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>
-<span id="L361" class="LineNr">361 </span>    assert<span class="Delimiter">(</span>score &lt; <span class="Constant">999</span><span class="Delimiter">);</span>
-<span id="L362" class="LineNr">362 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>score &lt; min_score<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L363" class="LineNr">363 </span>      min_score = score<span class="Delimiter">;</span>
-<span id="L364" class="LineNr">364 </span>      min_index = i<span class="Delimiter">;</span>
-<span id="L365" class="LineNr">365 </span>    <span class="Delimiter">}</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> score = abs<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>products<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>     + abs<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>score &lt; <span class="Constant">999</span><span class="Delimiter">);</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>score &lt; min_score<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> min_score = score<span class="Delimiter">;</span>
+<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> min_index = i<span class="Delimiter">;</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L366" class="LineNr">366 </span>  <span class="Delimiter">}</span>
 <span id="L367" class="LineNr">367 </span>  <span class="Identifier">return</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>min_index<span class="Delimiter">));</span>
 <span id="L368" class="LineNr">368 </span><span class="Delimiter">}</span>
@@ -433,7 +434,7 @@ if ('onhashchange' in window) {
 <span id="L370" class="LineNr">370 </span><span class="Normal">int</span> <a href='054static_dispatch.cc.html#L370'>non_ghost_size</a><span class="Delimiter">(</span>vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L371" class="LineNr">371 </span>  <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L372" class="LineNr">372 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L373" class="LineNr">373 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> != -<span class="Constant">1</span><span class="Delimiter">)</span> ++result<span class="Delimiter">;</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> != -<span class="Constant">1</span><span class="Delimiter">)</span> ++result<span class="Delimiter">;</span>
 <span id="L374" class="LineNr">374 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L375" class="LineNr">375 </span><span class="Delimiter">}</span>
 <span id="L376" class="LineNr">376 </span>
@@ -441,11 +442,11 @@ if ('onhashchange' in window) {
 <span id="L378" class="LineNr">378 </span>  <span class="Normal">const</span> recipe&amp; specializer_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> c<span class="Delimiter">.</span>running_recipe<span class="Delimiter">);</span>
 <span id="L379" class="LineNr">379 </span>  <span class="Normal">int</span> index = c<span class="Delimiter">.</span>running_step_index<span class="Delimiter">;</span>
 <span id="L380" class="LineNr">380 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>++index<span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L381" class="LineNr">381 </span>    <span class="Normal">const</span> instruction&amp; inst = specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L382" class="LineNr">382 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;stash&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L383" class="LineNr">383 </span>      *stash_inst = inst<span class="Delimiter">;</span>
-<span id="L384" class="LineNr">384 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L385" class="LineNr">385 </span>    <span class="Delimiter">}</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;stash&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *stash_inst = inst<span class="Delimiter">;</span>
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L385" class="LineNr">385 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L386" class="LineNr">386 </span>  <span class="Delimiter">}</span>
 <span id="L387" class="LineNr">387 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L388" class="LineNr">388 </span><span class="Delimiter">}</span>
@@ -631,10 +632,10 @@ if ('onhashchange' in window) {
 <span id="L568" class="LineNr">568 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L569" class="LineNr">569 </span>  out &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
 <span id="L570" class="LineNr">570 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L571" class="LineNr">571 </span>    out &lt;&lt; <span class="Constant">' '</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L571" class="LineNr">571 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">' '</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L572" class="LineNr">572 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> out &lt;&lt; <span class="Constant">&quot; -&gt;&quot;</span><span class="Delimiter">;</span>
 <span id="L573" class="LineNr">573 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L574" class="LineNr">574 </span>    out &lt;&lt; <span class="Constant">' '</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L574" class="LineNr">574 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">' '</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L575" class="LineNr">575 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L576" class="LineNr">576 </span><span class="Delimiter">}</span>
 <span id="L577" class="LineNr">577 </span>
diff --git a/html/055shape_shifting_container.cc.html b/html/055shape_shifting_container.cc.html
index 3206cb55..3b76abcd 100644
--- a/html/055shape_shifting_container.cc.html
+++ b/html/055shape_shifting_container.cc.html
@@ -18,15 +18,16 @@ a:hover { text-decoration: underline; }
 .SalientComment { color: #00ffff; }
 .CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.Special { color: #c00000; }
 .muData { color: #ffff00; }
-.traceContains { color: #008000; }
+.LineNr { color: #444444; }
+.cSpecial { color: #008000; }
 .Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
-.LineNr { color: #444444; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
 -->
 </style>
@@ -98,7 +99,7 @@ if ('onhashchange' in window) {
 <span id="L34" class="LineNr"> 34 </span><span class="Normal">const</span> type_tree* get_base_type<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Normal">const</span> type_tree* result = t<span class="Delimiter">-&gt;</span>atom ? t : t<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!result<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L37" class="LineNr"> 37 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>t<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>t<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L39" class="LineNr"> 39 </span><span class="Delimiter">}</span>
 <span id="L40" class="LineNr"> 40 </span>
@@ -210,9 +211,9 @@ if ('onhashchange' in window) {
 <span id="L146" class="LineNr">146 </span><span class="Normal">if</span> <span class="Delimiter">(</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">':'</span><span class="Delimiter">)</span> != string::npos<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L147" class="LineNr">147 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;container has type ingredients; parsing&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!read_type_ingredients<span class="Delimiter">(</span>name<span class="Delimiter">,</span> command<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L149" class="LineNr">149 </span>    <span class="Comment">// error; skip rest of the container definition and continue</span>
-<span id="L150" class="LineNr">150 </span>    <a href='016dilated_reagent.cc.html#L57'>slurp_balanced_bracket</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L151" class="LineNr">151 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Comment">// error; skip rest of the container definition and continue</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <a href='016dilated_reagent.cc.html#L57'>slurp_balanced_bracket</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Delimiter">}</span>
 <span id="L153" class="LineNr">153 </span><span class="Delimiter">}</span>
 <span id="L154" class="LineNr">154 </span>
@@ -223,21 +224,21 @@ if ('onhashchange' in window) {
 <span id="L159" class="LineNr">159 </span>  name = slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
 <span id="L160" class="LineNr">160 </span>  map&lt;string<span class="Delimiter">,</span> type_ordinal&gt; type_ingredient_names<span class="Delimiter">;</span>
 <span id="L161" class="LineNr">161 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!slurp_type_ingredients<span class="Delimiter">(</span>in<span class="Delimiter">,</span> type_ingredient_names<span class="Delimiter">,</span> name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L162" class="LineNr">162 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Delimiter">}</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span>
-<span id="L165" class="LineNr">165 </span>      &amp;&amp; contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Normal">const</span> type_info&amp; previous_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Comment">// we've already seen this container; make sure type ingredients match</span>
-<span id="L168" class="LineNr">168 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!type_ingredients_match<span class="Delimiter">(</span>type_ingredient_names<span class="Delimiter">,</span> previous_info<span class="Delimiter">.</span>type_ingredient_names<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L169" class="LineNr">169 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;headers of &quot;</span> &lt;&lt; command &lt;&lt; <span class="Constant">&quot; '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' must use identical type ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L170" class="LineNr">170 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L171" class="LineNr">171 </span>    <span class="Delimiter">}</span>
-<span id="L172" class="LineNr">172 </span>    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> type_info&amp; previous_info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Comment">// we've already seen this container; make sure type ingredients match</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!type_ingredients_match<span class="Delimiter">(</span>type_ingredient_names<span class="Delimiter">,</span> previous_info<span class="Delimiter">.</span>type_ingredient_names<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;headers of &quot;</span> &lt;&lt; command &lt;&lt; <span class="Constant">&quot; '&quot;</span> &lt;&lt; name &lt;&lt; <span class="Constant">&quot;' must use identical type ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Delimiter">}</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Comment">// we haven't seen this container before</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span>
-<span id="L176" class="LineNr">176 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
 <span id="L177" class="LineNr">177 </span>  type_info&amp; info = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
 <span id="L178" class="LineNr">178 </span>  info<span class="Delimiter">.</span>type_ingredient_names<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>type_ingredient_names<span class="Delimiter">);</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
@@ -246,20 +247,20 @@ if ('onhashchange' in window) {
 <span id="L182" class="LineNr">182 </span><span class="Normal">bool</span> slurp_type_ingredients<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> type_ordinal&gt;&amp; out<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; container_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Normal">int</span> next_type_ordinal = START_TYPE_INGREDIENTS<span class="Delimiter">;</span>
 <span id="L184" class="LineNr">184 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L185" class="LineNr">185 </span>    string curr = slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
-<span id="L186" class="LineNr">186 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L187" class="LineNr">187 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; container_name &lt;&lt; <span class="Constant">&quot;: empty type ingredients not permitted</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L188" class="LineNr">188 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L189" class="LineNr">189 </span>    <span class="Delimiter">}</span>
-<span id="L190" class="LineNr">190 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;_&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L191" class="LineNr">191 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; container_name &lt;&lt; <span class="Constant">&quot;: type ingredient '&quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">&quot;' must begin with an underscore</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L192" class="LineNr">192 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L193" class="LineNr">193 </span>    <span class="Delimiter">}</span>
-<span id="L194" class="LineNr">194 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>out<span class="Delimiter">.</span>find<span class="Delimiter">(</span>curr<span class="Delimiter">)</span> != out<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L195" class="LineNr">195 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; container_name &lt;&lt; <span class="Constant">&quot;: can't repeat type ingredient name'&quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">&quot;' in a single container definition</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L196" class="LineNr">196 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L197" class="LineNr">197 </span>    <span class="Delimiter">}</span>
-<span id="L198" class="LineNr">198 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> next_type_ordinal++<span class="Delimiter">);</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> string curr = slurp_until<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; container_name &lt;&lt; <span class="Constant">&quot;: empty type ingredients not permitted</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>curr<span class="Delimiter">,</span> <span class="Constant">&quot;_&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; container_name &lt;&lt; <span class="Constant">&quot;: type ingredient '&quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">&quot;' must begin with an underscore</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>out<span class="Delimiter">.</span>find<span class="Delimiter">(</span>curr<span class="Delimiter">)</span> != out<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; container_name &lt;&lt; <span class="Constant">&quot;: can't repeat type ingredient name'&quot;</span> &lt;&lt; curr &lt;&lt; <span class="Constant">&quot;' in a single container definition</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> next_type_ordinal++<span class="Delimiter">);</span>
 <span id="L199" class="LineNr">199 </span>  <span class="Delimiter">}</span>
 <span id="L200" class="LineNr">200 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L201" class="LineNr">201 </span><span class="Delimiter">}</span>
@@ -267,8 +268,8 @@ if ('onhashchange' in window) {
 <span id="L203" class="LineNr">203 </span><span class="Normal">bool</span> type_ingredients_match<span class="Delimiter">(</span><span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> type_ordinal&gt;&amp; a<span class="Delimiter">,</span> <span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> type_ordinal&gt;&amp; b<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>a<span class="Delimiter">)</span> != <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>b<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L205" class="LineNr">205 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> type_ordinal&gt;::const_iterator p = a<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != a<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>b<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L207" class="LineNr">207 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second != get<span class="Delimiter">(</span>b<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>b<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second != get<span class="Delimiter">(</span>b<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Delimiter">}</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L210" class="LineNr">210 </span><span class="Delimiter">}</span>
@@ -285,7 +286,7 @@ if ('onhashchange' in window) {
 <span id="L221" class="LineNr">221 </span>
 <span id="L222" class="LineNr">222 </span><span class="Delimiter">:(before &quot;End Container Type Checks&quot;)</span>
 <span id="L223" class="LineNr">223 </span><span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value &gt;= START_TYPE_INGREDIENTS
-<span id="L224" class="LineNr">224 </span>    &amp;&amp; <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value - START_TYPE_INGREDIENTS<span class="Delimiter">)</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>type_ingredient_names<span class="Delimiter">))</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> &amp;&amp; <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value - START_TYPE_INGREDIENTS<span class="Delimiter">)</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>type_ingredient_names<span class="Delimiter">))</span>
 <span id="L225" class="LineNr">225 </span>  <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L226" class="LineNr">226 </span>
 <span id="L227" class="LineNr">227 </span><span class="Delimiter">:(scenario size_of_shape_shifting_exclusive_container)</span>
@@ -406,9 +407,9 @@ if ('onhashchange' in window) {
 <span id="L342" class="LineNr">342 </span>
 <span id="L343" class="LineNr">343 </span><span class="Normal">void</span> replace_type_ingredients<span class="Delimiter">(</span>reagent&amp; element<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* caller_type<span class="Delimiter">,</span> <span class="Normal">const</span> type_info&amp; info<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; location_for_error_messages<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L344" class="LineNr">344 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_type_ingredient<span class="Delimiter">(</span>element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L345" class="LineNr">345 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
-<span id="L346" class="LineNr">346 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;illegal type &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>caller_type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; seems to be missing a type ingredient or three&quot;</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L347" class="LineNr">347 </span>    replace_type_ingredients<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> caller_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!caller_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;illegal type &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>caller_type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; seems to be missing a type ingredient or three&quot;</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">,</span> caller_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L348" class="LineNr">348 </span>  <span class="Delimiter">}</span>
 <span id="L349" class="LineNr">349 </span><span class="Delimiter">}</span>
 <span id="L350" class="LineNr">350 </span>
@@ -417,27 +418,27 @@ if ('onhashchange' in window) {
 <span id="L353" class="LineNr">353 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!callsite_type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// error but it's already been raised above</span>
 <span id="L354" class="LineNr">354 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!element_type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L355" class="LineNr">355 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!element_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L356" class="LineNr">356 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; is_type_ingredient<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>left<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L357" class="LineNr">357 </span>      <span class="Normal">int</span> type_ingredient_index = to_type_ingredient_index<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
-<span id="L358" class="LineNr">358 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>corresponding<span class="Delimiter">(</span>callsite_type<span class="Delimiter">,</span> type_ingredient_index<span class="Delimiter">,</span> is_final_type_ingredient<span class="Delimiter">(</span>type_ingredient_index<span class="Delimiter">,</span> container_info<span class="Delimiter">))-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L359" class="LineNr">359 </span>        <span class="Comment">// replacing type ingredient at end of list, and replacement is a non-degenerate compound type -- (a b) but not (a)</span>
-<span id="L360" class="LineNr">360 </span>        replace_type_ingredient_at<span class="Delimiter">(</span>type_ingredient_index<span class="Delimiter">,</span> <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L361" class="LineNr">361 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L362" class="LineNr">362 </span>      <span class="Delimiter">}</span>
-<span id="L363" class="LineNr">363 </span>    <span class="Delimiter">}</span>
-<span id="L364" class="LineNr">364 </span>    replace_type_ingredients<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L365" class="LineNr">365 </span>    replace_type_ingredients<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
-<span id="L366" class="LineNr">366 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L356" class="LineNr">356 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; is_type_ingredient<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>left<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> type_ingredient_index = to_type_ingredient_index<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>corresponding<span class="Delimiter">(</span>callsite_type<span class="Delimiter">,</span> type_ingredient_index<span class="Delimiter">,</span> is_final_type_ingredient<span class="Delimiter">(</span>type_ingredient_index<span class="Delimiter">,</span> container_info<span class="Delimiter">))-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// replacing type ingredient at end of list, and replacement is a non-degenerate compound type -- (a b) but not (a)</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> replace_type_ingredient_at<span class="Delimiter">(</span>type_ingredient_index<span class="Delimiter">,</span> <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L367" class="LineNr">367 </span>  <span class="Delimiter">}</span>
 <span id="L368" class="LineNr">368 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_type_ingredient<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">))</span>
-<span id="L369" class="LineNr">369 </span>    replace_type_ingredient_at<span class="Delimiter">(</span>to_type_ingredient_index<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">),</span> <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> replace_type_ingredient_at<span class="Delimiter">(</span>to_type_ingredient_index<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">),</span> <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">,</span> callsite_type<span class="Delimiter">,</span> container_info<span class="Delimiter">,</span> location_for_error_messages<span class="Delimiter">);</span>
 <span id="L370" class="LineNr">370 </span><span class="Delimiter">}</span>
 <span id="L371" class="LineNr">371 </span>
 <span id="L372" class="LineNr">372 </span><span class="Normal">const</span> type_tree* corresponding<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">,</span> <span class="Normal">int</span> index<span class="Delimiter">,</span> <span class="Normal">bool</span> <span class="Normal">final</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L373" class="LineNr">373 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">const</span> type_tree* curr = type<span class="Delimiter">;</span>  curr<span class="Delimiter">;</span>  curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> --index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L374" class="LineNr">374 </span>    <a href='003trace.cc.html#L171'>assert_for_now</a><span class="Delimiter">(</span>!curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
-<span id="L375" class="LineNr">375 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>index == <span class="Constant">0</span><span class="Delimiter">)</span>
-<span id="L376" class="LineNr">376 </span>      <span class="Identifier">return</span> <span class="Normal">final</span> ? curr : curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L171'>assert_for_now</a><span class="Delimiter">(</span>!curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>index == <span class="Constant">0</span><span class="Delimiter">)</span>
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Normal">final</span> ? curr : curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L377" class="LineNr">377 </span>  <span class="Delimiter">}</span>
 <span id="L378" class="LineNr">378 </span>  <a href='003trace.cc.html#L171'>assert_for_now</a><span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
 <span id="L379" class="LineNr">379 </span><span class="Delimiter">}</span>
@@ -453,8 +454,8 @@ if ('onhashchange' in window) {
 <span id="L389" class="LineNr">389 </span>
 <span id="L390" class="LineNr">390 </span><span class="Normal">void</span> replace_type_ingredient_at<span class="Delimiter">(</span><span class="Normal">const</span> <span class="Normal">int</span> type_ingredient_index<span class="Delimiter">,</span> type_tree* <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* callsite_type<span class="Delimiter">,</span> <span class="Normal">const</span> type_info&amp; container_info<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; location_for_error_messages<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L391" class="LineNr">391 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!has_nth_type<span class="Delimiter">(</span>callsite_type<span class="Delimiter">,</span> type_ingredient_index<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L392" class="LineNr">392 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;illegal type &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>callsite_type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; seems to be missing a type ingredient or three&quot;</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L393" class="LineNr">393 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;illegal type &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>callsite_type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; seems to be missing a type ingredient or three&quot;</span> &lt;&lt; location_for_error_messages &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L394" class="LineNr">394 </span>  <span class="Delimiter">}</span>
 <span id="L395" class="LineNr">395 </span>  *element_type = *nth_type_ingredient<span class="Delimiter">(</span>callsite_type<span class="Delimiter">,</span> type_ingredient_index<span class="Delimiter">,</span> container_info<span class="Delimiter">);</span>
 <span id="L396" class="LineNr">396 </span><span class="Delimiter">}</span>
@@ -463,10 +464,10 @@ if ('onhashchange' in window) {
 <span id="L399" class="LineNr">399 </span>  <span class="Normal">bool</span> <span class="Normal">final</span> = is_final_type_ingredient<span class="Delimiter">(</span>type_ingredient_index<span class="Delimiter">,</span> container_info<span class="Delimiter">);</span>
 <span id="L400" class="LineNr">400 </span>  <span class="Normal">const</span> type_tree* curr = callsite_type<span class="Delimiter">;</span>
 <span id="L401" class="LineNr">401 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; type_ingredient_index<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L402" class="LineNr">402 </span>    assert<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
-<span id="L403" class="LineNr">403 </span>    assert<span class="Delimiter">(</span>!curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
+<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L404" class="LineNr">404 </span><span class="CommentedCode">//?     cerr &lt;&lt; &quot;type ingredient &quot; &lt;&lt; i &lt;&lt; &quot; is &quot; &lt;&lt; to_string(curr-&gt;left) &lt;&lt; '\n';</span>
-<span id="L405" class="LineNr">405 </span>    curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L406" class="LineNr">406 </span>  <span class="Delimiter">}</span>
 <span id="L407" class="LineNr">407 </span>  assert<span class="Delimiter">(</span>curr<span class="Delimiter">);</span>
 <span id="L408" class="LineNr">408 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> curr<span class="Delimiter">;</span>
@@ -477,9 +478,9 @@ if ('onhashchange' in window) {
 <span id="L413" class="LineNr">413 </span>
 <span id="L414" class="LineNr">414 </span><span class="Normal">bool</span> is_final_type_ingredient<span class="Delimiter">(</span><span class="Normal">int</span> type_ingredient_index<span class="Delimiter">,</span> <span class="Normal">const</span> type_info&amp; container_info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L415" class="LineNr">415 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> type_ordinal&gt;::const_iterator p = container_info<span class="Delimiter">.</span>type_ingredient_names<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>
-<span id="L416" class="LineNr">416 </span>       p != container_info<span class="Delimiter">.</span>type_ingredient_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L417" class="LineNr">417 </span>       ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L418" class="LineNr">418 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second &gt; START_TYPE_INGREDIENTS+type_ingredient_index<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>p != container_info<span class="Delimiter">.</span>type_ingredient_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second &gt; START_TYPE_INGREDIENTS+type_ingredient_index<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L419" class="LineNr">419 </span>  <span class="Delimiter">}</span>
 <span id="L420" class="LineNr">420 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L421" class="LineNr">421 </span><span class="Delimiter">}</span>
@@ -487,9 +488,9 @@ if ('onhashchange' in window) {
 <span id="L423" class="LineNr">423 </span><span class="Delimiter">:(before &quot;End Unit Tests&quot;)</span>
 <span id="L424" class="LineNr">424 </span><span class="Normal">void</span> test_replace_type_ingredients_entire<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L425" class="LineNr">425 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L426" class="LineNr">426 </span>      <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L427" class="LineNr">427 </span>      <span class="Constant">&quot;  y:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L428" class="LineNr">428 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L429" class="LineNr">429 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:point&quot;</span><span class="Delimiter">);</span>
 <span id="L430" class="LineNr">430 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L431" class="LineNr">431 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element<span class="Delimiter">),</span> <span class="Constant">&quot;{x: </span><span class="cSpecial">\&quot;</span><span class="Constant">point</span><span class="cSpecial">\&quot;</span><span class="Constant">}&quot;</span><span class="Delimiter">);</span>
@@ -497,11 +498,11 @@ if ('onhashchange' in window) {
 <span id="L433" class="LineNr">433 </span>
 <span id="L434" class="LineNr">434 </span><span class="Normal">void</span> test_replace_type_ingredients_tail<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L435" class="LineNr">435 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L436" class="LineNr">436 </span>      <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L437" class="LineNr">437 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L438" class="LineNr">438 </span>      <span class="Constant">&quot;container bar:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L439" class="LineNr">439 </span>      <span class="Constant">&quot;  x:foo:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L440" class="LineNr">440 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L437" class="LineNr">437 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;container bar:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:foo:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L440" class="LineNr">440 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L441" class="LineNr">441 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;x:bar:point&quot;</span><span class="Delimiter">);</span>
 <span id="L442" class="LineNr">442 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L443" class="LineNr">443 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element<span class="Delimiter">),</span> <span class="Constant">&quot;{x: (</span><span class="cSpecial">\&quot;</span><span class="Constant">foo</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">point</span><span class="cSpecial">\&quot;</span><span class="Constant">)}&quot;</span><span class="Delimiter">);</span>
@@ -509,11 +510,11 @@ if ('onhashchange' in window) {
 <span id="L445" class="LineNr">445 </span>
 <span id="L446" class="LineNr">446 </span><span class="Normal">void</span> test_replace_type_ingredients_head_tail_multiple<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L447" class="LineNr">447 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L448" class="LineNr">448 </span>      <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L449" class="LineNr">449 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L450" class="LineNr">450 </span>      <span class="Constant">&quot;container bar:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L451" class="LineNr">451 </span>      <span class="Constant">&quot;  x:foo:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L452" class="LineNr">452 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L450" class="LineNr">450 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;container bar:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L451" class="LineNr">451 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:foo:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L453" class="LineNr">453 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;x:bar:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">);</span>
 <span id="L454" class="LineNr">454 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L455" class="LineNr">455 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element<span class="Delimiter">),</span> <span class="Constant">&quot;{x: (</span><span class="cSpecial">\&quot;</span><span class="Constant">foo</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant"><a href='043space.cc.html#L76'>address</a></span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">array</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">character</span><span class="cSpecial">\&quot;</span><span class="Constant">)}&quot;</span><span class="Delimiter">);</span>
@@ -521,11 +522,11 @@ if ('onhashchange' in window) {
 <span id="L457" class="LineNr">457 </span>
 <span id="L458" class="LineNr">458 </span><span class="Normal">void</span> test_replace_type_ingredients_head_middle<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L459" class="LineNr">459 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L460" class="LineNr">460 </span>      <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L461" class="LineNr">461 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L462" class="LineNr">462 </span>      <span class="Constant">&quot;container bar:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L463" class="LineNr">463 </span>      <span class="Constant">&quot;  x:foo:_elem:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L464" class="LineNr">464 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;container bar:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:foo:_elem:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L465" class="LineNr">465 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;x:bar:address&quot;</span><span class="Delimiter">);</span>
 <span id="L466" class="LineNr">466 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L467" class="LineNr">467 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element<span class="Delimiter">),</span> <span class="Constant">&quot;{x: (</span><span class="cSpecial">\&quot;</span><span class="Constant">foo</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant"><a href='043space.cc.html#L76'>address</a></span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">number</span><span class="cSpecial">\&quot;</span><span class="Constant">)}&quot;</span><span class="Delimiter">);</span>
@@ -533,9 +534,9 @@ if ('onhashchange' in window) {
 <span id="L469" class="LineNr">469 </span>
 <span id="L470" class="LineNr">470 </span><span class="Normal">void</span> test_replace_last_type_ingredient_with_multiple<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L471" class="LineNr">471 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_a:_b [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L472" class="LineNr">472 </span>      <span class="Constant">&quot;  x:_a</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L473" class="LineNr">473 </span>      <span class="Constant">&quot;  y:_b</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L474" class="LineNr">474 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_a</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_b</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L475" class="LineNr">475 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;{f: (foo number (address array character))}&quot;</span><span class="Delimiter">);</span>
 <span id="L476" class="LineNr">476 </span>  reagent element1 = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L477" class="LineNr">477 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element1<span class="Delimiter">),</span> <span class="Constant">&quot;{x: </span><span class="cSpecial">\&quot;</span><span class="Constant">number</span><span class="cSpecial">\&quot;</span><span class="Constant">}&quot;</span><span class="Delimiter">);</span>
@@ -545,8 +546,8 @@ if ('onhashchange' in window) {
 <span id="L481" class="LineNr">481 </span>
 <span id="L482" class="LineNr">482 </span><span class="Normal">void</span> test_replace_last_type_ingredient_inside_compound<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L483" class="LineNr">483 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_a:_b [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L484" class="LineNr">484 </span>      <span class="Constant">&quot;  {x: (bar _a (address _b))}</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L485" class="LineNr">485 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L484" class="LineNr">484 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  {x: (bar _a (address _b))}</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L486" class="LineNr">486 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;f:foo:number:array:character&quot;</span><span class="Delimiter">);</span>
 <span id="L487" class="LineNr">487 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L488" class="LineNr">488 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span>names_to_string_without_quotes<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">),</span> <span class="Constant">&quot;(bar number (address array character))&quot;</span><span class="Delimiter">);</span>
@@ -554,10 +555,10 @@ if ('onhashchange' in window) {
 <span id="L490" class="LineNr">490 </span>
 <span id="L491" class="LineNr">491 </span><span class="Normal">void</span> test_replace_middle_type_ingredient_with_multiple<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L492" class="LineNr">492 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_a:_b:_c [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L493" class="LineNr">493 </span>      <span class="Constant">&quot;  x:_a</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L494" class="LineNr">494 </span>      <span class="Constant">&quot;  y:_b</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L495" class="LineNr">495 </span>      <span class="Constant">&quot;  z:_c</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L496" class="LineNr">496 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_a</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_b</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  z:_c</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L496" class="LineNr">496 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L497" class="LineNr">497 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;{f: (foo number (address array character) boolean)}&quot;</span><span class="Delimiter">);</span>
 <span id="L498" class="LineNr">498 </span>  reagent element1 = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L499" class="LineNr">499 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element1<span class="Delimiter">),</span> <span class="Constant">&quot;{x: </span><span class="cSpecial">\&quot;</span><span class="Constant">number</span><span class="cSpecial">\&quot;</span><span class="Constant">}&quot;</span><span class="Delimiter">);</span>
@@ -569,9 +570,9 @@ if ('onhashchange' in window) {
 <span id="L505" class="LineNr">505 </span>
 <span id="L506" class="LineNr">506 </span><span class="Normal">void</span> test_replace_middle_type_ingredient_with_multiple2<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L507" class="LineNr">507 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_key:_value [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L508" class="LineNr">508 </span>      <span class="Constant">&quot;  key:_key</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L509" class="LineNr">509 </span>      <span class="Constant">&quot;  value:_value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L510" class="LineNr">510 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L508" class="LineNr">508 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  key:_key</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L509" class="LineNr">509 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  value:_value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L510" class="LineNr">510 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L511" class="LineNr">511 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;{f: (foo (address array character) number)}&quot;</span><span class="Delimiter">);</span>
 <span id="L512" class="LineNr">512 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L513" class="LineNr">513 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element<span class="Delimiter">),</span> <span class="Constant">&quot;{key: (</span><span class="cSpecial">\&quot;</span><span class="Constant"><a href='043space.cc.html#L76'>address</a></span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">array</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">character</span><span class="cSpecial">\&quot;</span><span class="Constant">)}&quot;</span><span class="Delimiter">);</span>
@@ -579,13 +580,13 @@ if ('onhashchange' in window) {
 <span id="L515" class="LineNr">515 </span>
 <span id="L516" class="LineNr">516 </span><span class="Normal">void</span> test_replace_middle_type_ingredient_with_multiple3<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L517" class="LineNr">517 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo_table:_key:_value [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L518" class="LineNr">518 </span>      <span class="Constant">&quot;  data:&amp;:@:foo_table_row:_key:_value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L519" class="LineNr">519 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L520" class="LineNr">520 </span>      <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L521" class="LineNr">521 </span>      <span class="Constant">&quot;container foo_table_row:_key:_value [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L522" class="LineNr">522 </span>      <span class="Constant">&quot;  key:_key</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L523" class="LineNr">523 </span>      <span class="Constant">&quot;  value:_value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L524" class="LineNr">524 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  data:&amp;:@:foo_table_row:_key:_value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L519" class="LineNr">519 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L520" class="LineNr">520 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L521" class="LineNr">521 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;container foo_table_row:_key:_value [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  key:_key</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  value:_value</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L524" class="LineNr">524 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L525" class="LineNr">525 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;{f: (foo_table (address array character) number)}&quot;</span><span class="Delimiter">);</span>
 <span id="L526" class="LineNr">526 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L527" class="LineNr">527 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span><a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>element<span class="Delimiter">),</span> <span class="Constant">&quot;{data: (</span><span class="cSpecial">\&quot;</span><span class="Constant"><a href='043space.cc.html#L76'>address</a></span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">array</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">foo_table_row</span><span class="cSpecial">\&quot;</span><span class="Constant"> (</span><span class="cSpecial">\&quot;</span><span class="Constant"><a href='043space.cc.html#L76'>address</a></span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">array</span><span class="cSpecial">\&quot;</span><span class="Constant"> </span><span class="cSpecial">\&quot;</span><span class="Constant">character</span><span class="cSpecial">\&quot;</span><span class="Constant">) </span><span class="cSpecial">\&quot;</span><span class="Constant">number</span><span class="cSpecial">\&quot;</span><span class="Constant">)}&quot;</span><span class="Delimiter">);</span>
@@ -632,9 +633,9 @@ if ('onhashchange' in window) {
 <span id="L568" class="LineNr">568 </span><span class="Delimiter">:(before &quot;End Unit Tests&quot;)</span>
 <span id="L569" class="LineNr">569 </span><span class="Normal">void</span> test_container_sizes_shape_shifting_container<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L570" class="LineNr">570 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L571" class="LineNr">571 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L572" class="LineNr">572 </span>      <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L573" class="LineNr">573 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L571" class="LineNr">571 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L572" class="LineNr">572 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L573" class="LineNr">573 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L574" class="LineNr">574 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:point&quot;</span><span class="Delimiter">);</span>
 <span id="L575" class="LineNr">575 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L576" class="LineNr">576 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">,</span> <span class="Constant">3</span><span class="Delimiter">);</span>
@@ -642,9 +643,9 @@ if ('onhashchange' in window) {
 <span id="L578" class="LineNr">578 </span>
 <span id="L579" class="LineNr">579 </span><span class="Normal">void</span> test_container_sizes_shape_shifting_exclusive_container<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L580" class="LineNr">580 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;exclusive-container foo:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L581" class="LineNr">581 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L582" class="LineNr">582 </span>      <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L583" class="LineNr">583 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L581" class="LineNr">581 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L582" class="LineNr">582 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L583" class="LineNr">583 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L584" class="LineNr">584 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:point&quot;</span><span class="Delimiter">);</span>
 <span id="L585" class="LineNr">585 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L586" class="LineNr">586 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">,</span> <span class="Constant">3</span><span class="Delimiter">);</span>
@@ -655,9 +656,9 @@ if ('onhashchange' in window) {
 <span id="L591" class="LineNr">591 </span>
 <span id="L592" class="LineNr">592 </span><span class="Normal">void</span> test_container_sizes_compound_type_ingredient<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L593" class="LineNr">593 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L594" class="LineNr">594 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L595" class="LineNr">595 </span>      <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L596" class="LineNr">596 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L594" class="LineNr">594 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L595" class="LineNr">595 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L596" class="LineNr">596 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L597" class="LineNr">597 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:&amp;:point&quot;</span><span class="Delimiter">);</span>
 <span id="L598" class="LineNr">598 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L599" class="LineNr">599 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">);</span>
@@ -669,9 +670,9 @@ if ('onhashchange' in window) {
 <span id="L605" class="LineNr">605 </span>
 <span id="L606" class="LineNr">606 </span><span class="Normal">void</span> test_container_sizes_recursive_shape_shifting_container<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L607" class="LineNr">607 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L608" class="LineNr">608 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L609" class="LineNr">609 </span>      <span class="Constant">&quot;  y:&amp;:foo:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L610" class="LineNr">610 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L608" class="LineNr">608 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L609" class="LineNr">609 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:&amp;:foo:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L610" class="LineNr">610 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L611" class="LineNr">611 </span>  reagent r2<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:num&quot;</span><span class="Delimiter">);</span>
 <span id="L612" class="LineNr">612 </span>  compute_container_sizes<span class="Delimiter">(</span>r2<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L613" class="LineNr">613 </span>  <a href='002test.cc.html#L32'>CHECK_EQ</a><span class="Delimiter">(</span>r2<span class="Delimiter">.</span>metadata<span class="Delimiter">.</span>size<span class="Delimiter">,</span> <span class="Constant">2</span><span class="Delimiter">);</span>
@@ -692,9 +693,9 @@ if ('onhashchange' in window) {
 <span id="L628" class="LineNr">628 </span><span class="Delimiter">:(before &quot;End Unit Tests&quot;)</span>
 <span id="L629" class="LineNr">629 </span><span class="Normal">void</span> test_container_address_offsets_in_shape_shifting_container<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L630" class="LineNr">630 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L631" class="LineNr">631 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L632" class="LineNr">632 </span>      <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L633" class="LineNr">633 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L631" class="LineNr">631 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L632" class="LineNr">632 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L633" class="LineNr">633 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L634" class="LineNr">634 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:&amp;:num&quot;</span><span class="Delimiter">);</span>
 <span id="L635" class="LineNr">635 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L636" class="LineNr">636 </span>  compute_container_address_offsets<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
@@ -709,13 +710,13 @@ if ('onhashchange' in window) {
 <span id="L645" class="LineNr">645 </span>
 <span id="L646" class="LineNr">646 </span><span class="Normal">void</span> test_container_address_offsets_in_nested_shape_shifting_container<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L647" class="LineNr">647 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L648" class="LineNr">648 </span>      <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L649" class="LineNr">649 </span>      <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L650" class="LineNr">650 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L651" class="LineNr">651 </span>      <span class="Constant">&quot;container bar:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L652" class="LineNr">652 </span>      <span class="Constant">&quot;  x:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L653" class="LineNr">653 </span>      <span class="Constant">&quot;  y:foo:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L654" class="LineNr">654 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L648" class="LineNr">648 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L649" class="LineNr">649 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L650" class="LineNr">650 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L651" class="LineNr">651 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;container bar:_t [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L652" class="LineNr">652 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L653" class="LineNr">653 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:foo:_t</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L654" class="LineNr">654 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L655" class="LineNr">655 </span>  reagent r<span class="Delimiter">(</span><span class="Constant">&quot;x:bar:&amp;:num&quot;</span><span class="Delimiter">);</span>
 <span id="L656" class="LineNr">656 </span>  <a href='003trace.cc.html#L158'>CLEAR_TRACE</a><span class="Delimiter">;</span>
 <span id="L657" class="LineNr">657 </span>  compute_container_sizes<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
diff --git a/html/056shape_shifting_recipe.cc.html b/html/056shape_shifting_recipe.cc.html
index fb3bb405..27dea8ee 100644
--- a/html/056shape_shifting_recipe.cc.html
+++ b/html/056shape_shifting_recipe.cc.html
@@ -18,12 +18,13 @@ a:hover { text-decoration: underline; }
 .SalientComment { color: #00ffff; }
 .CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.LineNr { color: #444444; }
 .muData { color: #ffff00; }
+.LineNr { color: #444444; }
 .traceContains { color: #008000; }
 .Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .Special { color: #c00000; }
@@ -100,7 +101,7 @@ if ('onhashchange' in window) {
 <span id="L35" class="LineNr">  35 </span>
 <span id="L36" class="LineNr">  36 </span><span class="Delimiter">:(after &quot;Running One Instruction&quot;)</span>
 <span id="L37" class="LineNr">  37 </span><span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index == <span class="Constant">0</span>
-<span id="L38" class="LineNr">  38 </span>    &amp;&amp; <a href='056shape_shifting_recipe.cc.html#L157'>any_type_ingredient_in_header</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L38" class="LineNr">  38 </span>  <span class="Conceal">¦</span> &amp;&amp; <a href='056shape_shifting_recipe.cc.html#L157'>any_type_ingredient_in_header</a><span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe<span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L39" class="LineNr">  39 </span><span class="CommentedCode">//?   DUMP(&quot;&quot;);</span>
 <span id="L40" class="LineNr">  40 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;ran into unspecialized shape-shifting <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L41" class="LineNr">  41 </span><span class="CommentedCode">//?   exit(0);</span>
@@ -129,13 +130,13 @@ if ('onhashchange' in window) {
 <span id="L64" class="LineNr">  64 </span>  recipe&amp; variant = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> new_recipe_ordinal<span class="Delimiter">);</span>
 <span id="L65" class="LineNr">  65 </span>  <span class="Comment">// perform all transforms on the new specialization</span>
 <span id="L66" class="LineNr">  66 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!variant<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L67" class="LineNr">  67 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;transforming new specialization: &quot;</span> &lt;&lt; variant<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L68" class="LineNr">  68 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span>  t &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Transform<span class="Delimiter">);</span>  ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr">  69 </span>      <span class="Comment">// one exception: skip tangle, which would have already occurred inside new_variant above</span>
-<span id="L70" class="LineNr">  70 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">)</span> == <span class="Comment">/*</span><span class="Comment">disambiguate overloading</span><span class="Comment">*/</span><span class="Normal">static_cast</span>&lt;transform_fn&gt;<span class="Delimiter">(</span>insert_fragments<span class="Delimiter">))</span>
-<span id="L71" class="LineNr">  71 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L72" class="LineNr">  72 </span>      <span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span>new_recipe_ordinal<span class="Delimiter">);</span>
-<span id="L73" class="LineNr">  73 </span>    <span class="Delimiter">}</span>
+<span id="L67" class="LineNr">  67 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;transforming new specialization: &quot;</span> &lt;&lt; variant<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L68" class="LineNr">  68 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> t = <span class="Constant">0</span><span class="Delimiter">;</span>  t &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Transform<span class="Delimiter">);</span>  ++t<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L69" class="LineNr">  69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// one exception: skip tangle, which would have already occurred inside new_variant above</span>
+<span id="L70" class="LineNr">  70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">)</span> == <span class="Comment">/*</span><span class="Comment">disambiguate overloading</span><span class="Comment">*/</span><span class="Normal">static_cast</span>&lt;transform_fn&gt;<span class="Delimiter">(</span>insert_fragments<span class="Delimiter">))</span>
+<span id="L71" class="LineNr">  71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L72" class="LineNr">  72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">(</span>*Transform<span class="Delimiter">.</span>at<span class="Delimiter">(</span>t<span class="Delimiter">))(</span>new_recipe_ordinal<span class="Delimiter">);</span>
+<span id="L73" class="LineNr">  73 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L74" class="LineNr">  74 </span>  <span class="Delimiter">}</span>
 <span id="L75" class="LineNr">  75 </span>  variant<span class="Delimiter">.</span>transformed_until = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Transform<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L76" class="LineNr">  76 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;new specialization: &quot;</span> &lt;&lt; variant<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -148,7 +149,7 @@ if ('onhashchange' in window) {
 <span id="L83" class="LineNr">  83 </span>
 <span id="L84" class="LineNr">  84 </span><span class="Delimiter">:(before &quot;End Instruction Operation Checks&quot;)</span>
 <span id="L85" class="LineNr">  85 </span><span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> &amp;&amp; inst<span class="Delimiter">.</span>operation &gt;= <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a>
-<span id="L86" class="LineNr">  86 </span>    &amp;&amp; <a href='056shape_shifting_recipe.cc.html#L157'>any_type_ingredient_in_header</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L86" class="LineNr">  86 </span>  <span class="Conceal">¦</span> &amp;&amp; <a href='056shape_shifting_recipe.cc.html#L157'>any_type_ingredient_in_header</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L87" class="LineNr">  87 </span>  <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' has no valid specialization</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L88" class="LineNr">  88 </span>  <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L89" class="LineNr">  89 </span><span class="Delimiter">}</span>
@@ -156,7 +157,7 @@ if ('onhashchange' in window) {
 <span id="L91" class="LineNr">  91 </span><span class="Delimiter">:(replace{} &quot;bool types_strictly_match_except_literal_zero_against_address(const reagent&amp; to, const reagent&amp; from)&quot;)</span>
 <span id="L92" class="LineNr">  92 </span><span class="Normal">bool</span> types_strictly_match_except_literal_zero_against_address<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L93" class="LineNr">  93 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span>
-<span id="L94" class="LineNr">  94 </span>    <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> &amp;&amp; !contains_type_ingredient_name<span class="Delimiter">(</span>to<span class="Delimiter">);</span>
+<span id="L94" class="LineNr">  94 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> &amp;&amp; !contains_type_ingredient_name<span class="Delimiter">(</span>to<span class="Delimiter">);</span>
 <span id="L95" class="LineNr">  95 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">);</span>
 <span id="L96" class="LineNr">  96 </span><span class="Delimiter">}</span>
 <span id="L97" class="LineNr">  97 </span>
@@ -165,27 +166,27 @@ if ('onhashchange' in window) {
 <span id="L100" class="LineNr"> 100 </span>vector&lt;recipe_ordinal&gt; <a href='056shape_shifting_recipe.cc.html#L100'>strictly_matching_shape_shifting_variants</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L101" class="LineNr"> 101 </span>  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
 <span id="L102" class="LineNr"> 102 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variants<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L103" class="LineNr"> 103 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L104" class="LineNr"> 104 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!any_type_ingredient_in_header<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L105" class="LineNr"> 105 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_concrete_header_reagents_strictly_match<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L106" class="LineNr"> 106 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L103" class="LineNr"> 103 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L104" class="LineNr"> 104 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!any_type_ingredient_in_header<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L105" class="LineNr"> 105 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!all_concrete_header_reagents_strictly_match<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L106" class="LineNr"> 106 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L107" class="LineNr"> 107 </span>  <span class="Delimiter">}</span>
 <span id="L108" class="LineNr"> 108 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L109" class="LineNr"> 109 </span><span class="Delimiter">}</span>
 <span id="L110" class="LineNr"> 110 </span>
 <span id="L111" class="LineNr"> 111 </span><span class="Normal">bool</span> <a href='056shape_shifting_recipe.cc.html#L111'>all_concrete_header_reagents_strictly_match</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L112" class="LineNr"> 112 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L113" class="LineNr"> 113 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!concrete_type_names_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr"> 114 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;concrete-type match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L115" class="LineNr"> 115 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L116" class="LineNr"> 116 </span>    <span class="Delimiter">}</span>
+<span id="L113" class="LineNr"> 113 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!concrete_type_names_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L114" class="LineNr"> 114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;concrete-type match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L115" class="LineNr"> 115 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L116" class="LineNr"> 116 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L117" class="LineNr"> 117 </span>  <span class="Delimiter">}</span>
 <span id="L118" class="LineNr"> 118 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr"> 119 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L120" class="LineNr"> 120 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!concrete_type_names_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L121" class="LineNr"> 121 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;concrete-type match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L122" class="LineNr"> 122 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L123" class="LineNr"> 123 </span>    <span class="Delimiter">}</span>
+<span id="L119" class="LineNr"> 119 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L120" class="LineNr"> 120 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!concrete_type_names_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L121" class="LineNr"> 121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;concrete-type match failed: product &quot;</span> &lt;&lt; i &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L122" class="LineNr"> 122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L123" class="LineNr"> 123 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L124" class="LineNr"> 124 </span>  <span class="Delimiter">}</span>
 <span id="L125" class="LineNr"> 125 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L126" class="LineNr"> 126 </span><span class="Delimiter">}</span>
@@ -196,25 +197,25 @@ if ('onhashchange' in window) {
 <span id="L131" class="LineNr"> 131 </span>  <span class="Comment">// primary score</span>
 <span id="L132" class="LineNr"> 132 </span>  <span class="Normal">int</span> max_score = -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L133" class="LineNr"> 133 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidates<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L134" class="LineNr"> 134 </span>    <span class="Normal">int</span> score = number_of_concrete_type_names<span class="Delimiter">(</span>candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L135" class="LineNr"> 135 </span>    assert<span class="Delimiter">(</span>score &gt; -<span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L136" class="LineNr"> 136 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>score &gt; max_score<span class="Delimiter">)</span> max_score = score<span class="Delimiter">;</span>
+<span id="L134" class="LineNr"> 134 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> score = number_of_concrete_type_names<span class="Delimiter">(</span>candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L135" class="LineNr"> 135 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>score &gt; -<span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L136" class="LineNr"> 136 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>score &gt; max_score<span class="Delimiter">)</span> max_score = score<span class="Delimiter">;</span>
 <span id="L137" class="LineNr"> 137 </span>  <span class="Delimiter">}</span>
 <span id="L138" class="LineNr"> 138 </span>  <span class="Comment">// break any ties at max_score by a secondary score</span>
 <span id="L139" class="LineNr"> 139 </span>  <span class="Normal">int</span> min_score2 = <span class="Constant">999</span><span class="Delimiter">;</span>
 <span id="L140" class="LineNr"> 140 </span>  <span class="Normal">int</span> best_index = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L141" class="LineNr"> 141 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidates<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L142" class="LineNr"> 142 </span>    <span class="Normal">int</span> score1 = number_of_concrete_type_names<span class="Delimiter">(</span>candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L143" class="LineNr"> 143 </span>    assert<span class="Delimiter">(</span>score1 &lt;= max_score<span class="Delimiter">);</span>
-<span id="L144" class="LineNr"> 144 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>score1 != max_score<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L145" class="LineNr"> 145 </span>    <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L146" class="LineNr"> 146 </span>    <span class="Normal">int</span> score2 = <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>products<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
-<span id="L147" class="LineNr"> 147 </span>                           + <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>
-<span id="L148" class="LineNr"> 148 </span>    assert<span class="Delimiter">(</span>score2 &lt; <span class="Constant">999</span><span class="Delimiter">);</span>
-<span id="L149" class="LineNr"> 149 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>score2 &lt; min_score2<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L150" class="LineNr"> 150 </span>      min_score2 = score2<span class="Delimiter">;</span>
-<span id="L151" class="LineNr"> 151 </span>      best_index = i<span class="Delimiter">;</span>
-<span id="L152" class="LineNr"> 152 </span>    <span class="Delimiter">}</span>
+<span id="L142" class="LineNr"> 142 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> score1 = number_of_concrete_type_names<span class="Delimiter">(</span>candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L143" class="LineNr"> 143 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>score1 &lt;= max_score<span class="Delimiter">);</span>
+<span id="L144" class="LineNr"> 144 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>score1 != max_score<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L145" class="LineNr"> 145 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L146" class="LineNr"> 146 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> score2 = <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>products<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
+<span id="L147" class="LineNr"> 147 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>      + <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>
+<span id="L148" class="LineNr"> 148 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>score2 &lt; <span class="Constant">999</span><span class="Delimiter">);</span>
+<span id="L149" class="LineNr"> 149 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>score2 &lt; min_score2<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L150" class="LineNr"> 150 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> min_score2 = score2<span class="Delimiter">;</span>
+<span id="L151" class="LineNr"> 151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> best_index = i<span class="Delimiter">;</span>
+<span id="L152" class="LineNr"> 152 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L153" class="LineNr"> 153 </span>  <span class="Delimiter">}</span>
 <span id="L154" class="LineNr"> 154 </span>  <span class="Identifier">return</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>best_index<span class="Delimiter">);</span>
 <span id="L155" class="LineNr"> 155 </span><span class="Delimiter">}</span>
@@ -222,12 +223,12 @@ if ('onhashchange' in window) {
 <span id="L157" class="LineNr"> 157 </span><span class="Normal">bool</span> <a href='056shape_shifting_recipe.cc.html#L157'>any_type_ingredient_in_header</a><span class="Delimiter">(</span><a href='010vm.cc.html#L14'>recipe_ordinal</a> variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L158" class="LineNr"> 158 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variant<span class="Delimiter">);</span>
 <span id="L159" class="LineNr"> 159 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L160" class="LineNr"> 160 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_type_ingredient_name<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L161" class="LineNr"> 161 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L160" class="LineNr"> 160 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_type_ingredient_name<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L161" class="LineNr"> 161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L162" class="LineNr"> 162 </span>  <span class="Delimiter">}</span>
 <span id="L163" class="LineNr"> 163 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr"> 164 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contains_type_ingredient_name<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L165" class="LineNr"> 165 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L164" class="LineNr"> 164 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_type_ingredient_name<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L165" class="LineNr"> 165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L166" class="LineNr"> 166 </span>  <span class="Delimiter">}</span>
 <span id="L167" class="LineNr"> 167 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L168" class="LineNr"> 168 </span><span class="Delimiter">}</span>
@@ -244,16 +245,16 @@ if ('onhashchange' in window) {
 <span id="L179" class="LineNr"> 179 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>atom &amp;&amp; is_type_ingredient_name<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>  <span class="Comment">// type ingredient matches anything</span>
 <span id="L180" class="LineNr"> 180 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; to<span class="Delimiter">-&gt;</span>left != <span class="Constant">NULL</span> &amp;&amp; to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; is_type_ingredient_name<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L181" class="LineNr"> 181 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom &amp;&amp; is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span>
-<span id="L182" class="LineNr"> 182 </span>    <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span> &amp;&amp; rhs_reagent<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
+<span id="L182" class="LineNr"> 182 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span> &amp;&amp; rhs_reagent<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
 <span id="L183" class="LineNr"> 183 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!from<span class="Delimiter">-&gt;</span>atom &amp;&amp; !to<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L184" class="LineNr"> 184 </span>    <span class="Identifier">return</span> concrete_type_names_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> rhs_reagent<span class="Delimiter">)</span>
-<span id="L185" class="LineNr"> 185 </span>        &amp;&amp; concrete_type_names_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> rhs_reagent<span class="Delimiter">);</span>
+<span id="L184" class="LineNr"> 184 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> concrete_type_names_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> rhs_reagent<span class="Delimiter">)</span>
+<span id="L185" class="LineNr"> 185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; concrete_type_names_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> rhs_reagent<span class="Delimiter">);</span>
 <span id="L186" class="LineNr"> 186 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom != to<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L187" class="LineNr"> 187 </span>  <span class="Comment">// both from and to are atoms</span>
 <span id="L188" class="LineNr"> 188 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
-<span id="L189" class="LineNr"> 189 </span>    <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L189" class="LineNr"> 189 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L190" class="LineNr"> 190 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
-<span id="L191" class="LineNr"> 191 </span>    <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L191" class="LineNr"> 191 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L192" class="LineNr"> 192 </span>  <span class="Identifier">return</span> to<span class="Delimiter">-&gt;</span>name == from<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
 <span id="L193" class="LineNr"> 193 </span><span class="Delimiter">}</span>
 <span id="L194" class="LineNr"> 194 </span>
@@ -271,9 +272,9 @@ if ('onhashchange' in window) {
 <span id="L206" class="LineNr"> 206 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L207" class="LineNr"> 207 </span>  <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L208" class="LineNr"> 208 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L209" class="LineNr"> 209 </span>    result += number_of_concrete_type_names<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L209" class="LineNr"> 209 </span>  <span class="Conceal">¦</span> result += number_of_concrete_type_names<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L210" class="LineNr"> 210 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L211" class="LineNr"> 211 </span>    result += number_of_concrete_type_names<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L211" class="LineNr"> 211 </span>  <span class="Conceal">¦</span> result += number_of_concrete_type_names<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span id="L212" class="LineNr"> 212 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L213" class="LineNr"> 213 </span><span class="Delimiter">}</span>
 <span id="L214" class="LineNr"> 214 </span>
@@ -284,9 +285,9 @@ if ('onhashchange' in window) {
 <span id="L219" class="LineNr"> 219 </span><span class="Normal">int</span> number_of_concrete_type_names<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L220" class="LineNr"> 220 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr"> 221 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L222" class="LineNr"> 222 </span>    <span class="Identifier">return</span> is_type_ingredient_name<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> ? <span class="Constant">0</span> : <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L222" class="LineNr"> 222 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> is_type_ingredient_name<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> ? <span class="Constant">0</span> : <span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L223" class="LineNr"> 223 </span>  <span class="Identifier">return</span> number_of_concrete_type_names<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
-<span id="L224" class="LineNr"> 224 </span>       + number_of_concrete_type_names<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+<span id="L224" class="LineNr"> 224 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>+ number_of_concrete_type_names<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
 <span id="L225" class="LineNr"> 225 </span><span class="Delimiter">}</span>
 <span id="L226" class="LineNr"> 226 </span>
 <span id="L227" class="LineNr"> 227 </span><a href='010vm.cc.html#L14'>recipe_ordinal</a> <a href='056shape_shifting_recipe.cc.html#L227'>new_variant</a><span class="Delimiter">(</span><a href='010vm.cc.html#L14'>recipe_ordinal</a> exemplar<span class="Delimiter">,</span> <span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller_recipe<span class="Delimiter">)</span> <span class="Delimiter">{</span>
@@ -313,14 +314,14 @@ if ('onhashchange' in window) {
 <span id="L248" class="LineNr"> 248 </span>  <a href='056shape_shifting_recipe.cc.html#L265'>compute_type_names</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">);</span>
 <span id="L249" class="LineNr"> 249 </span>  <span class="Comment">// that gives enough information to replace type-ingredients with concrete types</span>
 <span id="L250" class="LineNr"> 250 </span>  <span class="Delimiter">{</span>
-<span id="L251" class="LineNr"> 251 </span>    map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt; mappings<span class="Delimiter">;</span>
-<span id="L252" class="LineNr"> 252 </span>    <span class="Normal">bool</span> error = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L253" class="LineNr"> 253 </span>    <a href='056shape_shifting_recipe.cc.html#L299'>compute_type_ingredient_mappings</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> exemplar<span class="Delimiter">),</span> inst<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> &amp;error<span class="Delimiter">);</span>
-<span id="L254" class="LineNr"> 254 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!error<span class="Delimiter">)</span> error = <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>mappings<span class="Delimiter">)</span> != <a href='056shape_shifting_recipe.cc.html#L437'>type_ingredient_count_in_header</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">));</span>
-<span id="L255" class="LineNr"> 255 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!error<span class="Delimiter">)</span> replace_type_ingredients<span class="Delimiter">(</span>new_recipe<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
-<span id="L256" class="LineNr"> 256 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt;::iterator p = mappings<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != mappings<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L257" class="LineNr"> 257 </span>      <span class="Normal">delete</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
-<span id="L258" class="LineNr"> 258 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>error<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L251" class="LineNr"> 251 </span>  <span class="Conceal">¦</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt; mappings<span class="Delimiter">;</span>
+<span id="L252" class="LineNr"> 252 </span>  <span class="Conceal">¦</span> <span class="Normal">bool</span> error = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L253" class="LineNr"> 253 </span>  <span class="Conceal">¦</span> <a href='056shape_shifting_recipe.cc.html#L299'>compute_type_ingredient_mappings</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> exemplar<span class="Delimiter">),</span> inst<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> &amp;error<span class="Delimiter">);</span>
+<span id="L254" class="LineNr"> 254 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!error<span class="Delimiter">)</span> error = <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>mappings<span class="Delimiter">)</span> != <a href='056shape_shifting_recipe.cc.html#L437'>type_ingredient_count_in_header</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">));</span>
+<span id="L255" class="LineNr"> 255 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!error<span class="Delimiter">)</span> replace_type_ingredients<span class="Delimiter">(</span>new_recipe<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
+<span id="L256" class="LineNr"> 256 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt;::iterator p = mappings<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != mappings<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
+<span id="L257" class="LineNr"> 257 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
+<span id="L258" class="LineNr"> 258 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>error<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L259" class="LineNr"> 259 </span>  <span class="Delimiter">}</span>
 <span id="L260" class="LineNr"> 260 </span>  ensure_all_concrete_types<span class="Delimiter">(</span>new_recipe<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> exemplar<span class="Delimiter">));</span>
 <span id="L261" class="LineNr"> 261 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> new_recipe_ordinal<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
@@ -331,29 +332,29 @@ if ('onhashchange' in window) {
 <span id="L266" class="LineNr"> 266 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;-- compute type names: &quot;</span> &lt;&lt; variant<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L267" class="LineNr"> 267 </span>  map&lt;string<span class="Delimiter">,</span> type_tree*&gt; type_names<span class="Delimiter">;</span>
 <span id="L268" class="LineNr"> 268 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L269" class="LineNr"> 269 </span>    <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L269" class="LineNr"> 269 </span>  <span class="Conceal">¦</span> <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L270" class="LineNr"> 270 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L271" class="LineNr"> 271 </span>    <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
+<span id="L271" class="LineNr"> 271 </span>  <span class="Conceal">¦</span> <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">);</span>
 <span id="L272" class="LineNr"> 272 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L273" class="LineNr"> 273 </span>    instruction&amp; inst = variant<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L274" class="LineNr"> 274 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  <a href='010vm.cc.html#L32'>instruction</a>: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L275" class="LineNr"> 275 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span>
-<span id="L276" class="LineNr"> 276 </span>      <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot; in '&quot;</span> + inst<span class="Delimiter">.</span>original_string + <span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
-<span id="L277" class="LineNr"> 277 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span>
-<span id="L278" class="LineNr"> 278 </span>      <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot; in '&quot;</span> + inst<span class="Delimiter">.</span>original_string + <span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+<span id="L273" class="LineNr"> 273 </span>  <span class="Conceal">¦</span> instruction&amp; inst = variant<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L274" class="LineNr"> 274 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  <a href='010vm.cc.html#L32'>instruction</a>: &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L275" class="LineNr"> 275 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span>
+<span id="L276" class="LineNr"> 276 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot; in '&quot;</span> + inst<span class="Delimiter">.</span>original_string + <span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+<span id="L277" class="LineNr"> 277 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span>
+<span id="L278" class="LineNr"> 278 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>out<span class="Delimiter">),</span> type_names<span class="Delimiter">,</span> variant<span class="Delimiter">,</span> <span class="Constant">&quot; in '&quot;</span> + inst<span class="Delimiter">.</span>original_string + <span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
 <span id="L279" class="LineNr"> 279 </span>  <span class="Delimiter">}</span>
 <span id="L280" class="LineNr"> 280 </span><span class="Delimiter">}</span>
 <span id="L281" class="LineNr"> 281 </span>
 <span id="L282" class="LineNr"> 282 </span><span class="Normal">void</span> <a href='056shape_shifting_recipe.cc.html#L282'>save_or_deduce_type_name</a><span class="Delimiter">(</span>reagent&amp; x<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> type_tree*&gt;&amp; type<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; context<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L283" class="LineNr"> 283 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9994</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;    checking &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L284" class="LineNr"> 284 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type &amp;&amp; contains_key<span class="Delimiter">(</span>type<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L285" class="LineNr"> 285 </span>    x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>type<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
-<span id="L286" class="LineNr"> 286 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9994</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;    deducing type to &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L287" class="LineNr"> 287 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L285" class="LineNr"> 285 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*get<span class="Delimiter">(</span>type<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
+<span id="L286" class="LineNr"> 286 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9994</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;    deducing type to &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L287" class="LineNr"> 287 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L288" class="LineNr"> 288 </span>  <span class="Delimiter">}</span>
 <span id="L289" class="LineNr"> 289 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L290" class="LineNr"> 290 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>original_name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;unknown type for '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; context &lt;&lt; <span class="Constant">&quot; (check the name for typos)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L291" class="LineNr"> 291 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L290" class="LineNr"> 290 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>variant<span class="Delimiter">.</span>original_name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;unknown type for '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; context &lt;&lt; <span class="Constant">&quot; (check the name for typos)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L291" class="LineNr"> 291 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L292" class="LineNr"> 292 </span>  <span class="Delimiter">}</span>
 <span id="L293" class="LineNr"> 293 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>type<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L294" class="LineNr"> 294 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;offset&quot;</span> || x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;variant&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// special-case for container-access instructions</span>
@@ -364,19 +365,19 @@ if ('onhashchange' in window) {
 <span id="L299" class="LineNr"> 299 </span><span class="Normal">void</span> <a href='056shape_shifting_recipe.cc.html#L299'>compute_type_ingredient_mappings</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; exemplar<span class="Delimiter">,</span> <span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt;&amp; mappings<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller_recipe<span class="Delimiter">,</span> <span class="Normal">bool</span>* error<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L300" class="LineNr"> 300 </span>  <span class="Normal">int</span> limit = min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>
 <span id="L301" class="LineNr"> 301 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; limit<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L302" class="LineNr"> 302 </span>    <span class="Normal">const</span> reagent&amp; exemplar_reagent = exemplar<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L303" class="LineNr"> 303 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L304" class="LineNr"> 304 </span>    canonize_type<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
-<span id="L305" class="LineNr"> 305 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>exemplar_reagent<span class="Delimiter">)</span> &amp;&amp; ingredient<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// assume it matches</span>
-<span id="L306" class="LineNr"> 306 </span>    accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_reagent<span class="Delimiter">,</span> ingredient<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
+<span id="L302" class="LineNr"> 302 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; exemplar_reagent = exemplar<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L303" class="LineNr"> 303 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L304" class="LineNr"> 304 </span>  <span class="Conceal">¦</span> canonize_type<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
+<span id="L305" class="LineNr"> 305 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>exemplar_reagent<span class="Delimiter">)</span> &amp;&amp; ingredient<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// assume it matches</span>
+<span id="L306" class="LineNr"> 306 </span>  <span class="Conceal">¦</span> accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_reagent<span class="Delimiter">,</span> ingredient<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
 <span id="L307" class="LineNr"> 307 </span>  <span class="Delimiter">}</span>
 <span id="L308" class="LineNr"> 308 </span>  limit = min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>products<span class="Delimiter">));</span>
 <span id="L309" class="LineNr"> 309 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; limit<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L310" class="LineNr"> 310 </span>    <span class="Normal">const</span> reagent&amp; exemplar_reagent = exemplar<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L311" class="LineNr"> 311 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L312" class="LineNr"> 312 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L313" class="LineNr"> 313 </span>    canonize_type<span class="Delimiter">(</span>product<span class="Delimiter">);</span>
-<span id="L314" class="LineNr"> 314 </span>    accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_reagent<span class="Delimiter">,</span> product<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
+<span id="L310" class="LineNr"> 310 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; exemplar_reagent = exemplar<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L311" class="LineNr"> 311 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L312" class="LineNr"> 312 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>product<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L313" class="LineNr"> 313 </span>  <span class="Conceal">¦</span> canonize_type<span class="Delimiter">(</span>product<span class="Delimiter">);</span>
+<span id="L314" class="LineNr"> 314 </span>  <span class="Conceal">¦</span> accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_reagent<span class="Delimiter">,</span> product<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
 <span id="L315" class="LineNr"> 315 </span>  <span class="Delimiter">}</span>
 <span id="L316" class="LineNr"> 316 </span><span class="Delimiter">}</span>
 <span id="L317" class="LineNr"> 317 </span>
@@ -388,47 +389,47 @@ if ('onhashchange' in window) {
 <span id="L323" class="LineNr"> 323 </span><span class="Normal">void</span> accumulate_type_ingredients<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* exemplar_type<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* refinement_type<span class="Delimiter">,</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt;&amp; mappings<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; exemplar<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; exemplar_reagent<span class="Delimiter">,</span> <span class="Normal">const</span> instruction&amp; call_instruction<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller_recipe<span class="Delimiter">,</span> <span class="Normal">bool</span>* error<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L324" class="LineNr"> 324 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!exemplar_type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L325" class="LineNr"> 325 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!refinement_type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L326" class="LineNr"> 326 </span>    <span class="Comment">// probably a bug in mu</span>
-<span id="L327" class="LineNr"> 327 </span>    <span class="Comment">// todo: make this smarter; only flag an error if exemplar_type contains some *new* type ingredient</span>
-<span id="L328" class="LineNr"> 328 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;missing type ingredient for &quot;</span> &lt;&lt; exemplar_reagent<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L329" class="LineNr"> 329 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (called from '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>call_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L330" class="LineNr"> 330 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L326" class="LineNr"> 326 </span>  <span class="Conceal">¦</span> <span class="Comment">// probably a bug in mu</span>
+<span id="L327" class="LineNr"> 327 </span>  <span class="Conceal">¦</span> <span class="Comment">// todo: make this smarter; only flag an error if exemplar_type contains some *new* type ingredient</span>
+<span id="L328" class="LineNr"> 328 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;missing type ingredient for &quot;</span> &lt;&lt; exemplar_reagent<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L329" class="LineNr"> 329 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  (called from '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>call_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L330" class="LineNr"> 330 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L331" class="LineNr"> 331 </span>  <span class="Delimiter">}</span>
 <span id="L332" class="LineNr"> 332 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!exemplar_type<span class="Delimiter">-&gt;</span>atom &amp;&amp; exemplar_type<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; !refinement_type<span class="Delimiter">-&gt;</span>atom &amp;&amp; refinement_type<span class="Delimiter">-&gt;</span>right != <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L333" class="LineNr"> 333 </span>    exemplar_type = exemplar_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
-<span id="L334" class="LineNr"> 334 </span>    <a href='003trace.cc.html#L171'>assert_for_now</a><span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L333" class="LineNr"> 333 </span>  <span class="Conceal">¦</span> exemplar_type = exemplar_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
+<span id="L334" class="LineNr"> 334 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L171'>assert_for_now</a><span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L335" class="LineNr"> 335 </span>  <span class="Delimiter">}</span>
 <span id="L336" class="LineNr"> 336 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L337" class="LineNr"> 337 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_type_ingredient_name<span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L338" class="LineNr"> 338 </span>      <span class="Normal">const</span> type_tree* curr_refinement_type = <span class="Constant">NULL</span><span class="Delimiter">;</span>  <span class="Comment">// temporary heap allocation; must always be deleted before it goes out of scope</span>
-<span id="L339" class="LineNr"> 339 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L340" class="LineNr"> 340 </span>        curr_refinement_type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*refinement_type<span class="Delimiter">);</span>
-<span id="L341" class="LineNr"> 341 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L342" class="LineNr"> 342 </span>        assert<span class="Delimiter">(</span>!refinement_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
-<span id="L343" class="LineNr"> 343 </span>        curr_refinement_type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*refinement_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
-<span id="L344" class="LineNr"> 344 </span>      <span class="Delimiter">}</span>
-<span id="L345" class="LineNr"> 345 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L346" class="LineNr"> 346 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;adding mapping from &quot;</span> &lt;&lt; exemplar_type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>curr_refinement_type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L347" class="LineNr"> 347 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*curr_refinement_type<span class="Delimiter">));</span>
-<span id="L348" class="LineNr"> 348 </span>      <span class="Delimiter">}</span>
-<span id="L349" class="LineNr"> 349 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L350" class="LineNr"> 350 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">),</span> curr_refinement_type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L351" class="LineNr"> 351 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;no call found for '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>call_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L352" class="LineNr"> 352 </span>          *error = <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L353" class="LineNr"> 353 </span>          <span class="Normal">delete</span> curr_refinement_type<span class="Delimiter">;</span>
-<span id="L354" class="LineNr"> 354 </span>          <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L355" class="LineNr"> 355 </span>        <span class="Delimiter">}</span>
-<span id="L356" class="LineNr"> 356 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L357" class="LineNr"> 357 </span>          <span class="Normal">delete</span> get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
-<span id="L358" class="LineNr"> 358 </span>          <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*curr_refinement_type<span class="Delimiter">));</span>
-<span id="L359" class="LineNr"> 359 </span>        <span class="Delimiter">}</span>
-<span id="L360" class="LineNr"> 360 </span>      <span class="Delimiter">}</span>
-<span id="L361" class="LineNr"> 361 </span>      <span class="Normal">delete</span> curr_refinement_type<span class="Delimiter">;</span>
-<span id="L362" class="LineNr"> 362 </span>    <span class="Delimiter">}</span>
+<span id="L337" class="LineNr"> 337 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_type_ingredient_name<span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L338" class="LineNr"> 338 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> type_tree* curr_refinement_type = <span class="Constant">NULL</span><span class="Delimiter">;</span>  <span class="Comment">// temporary heap allocation; must always be deleted before it goes out of scope</span>
+<span id="L339" class="LineNr"> 339 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
+<span id="L340" class="LineNr"> 340 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_refinement_type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*refinement_type<span class="Delimiter">);</span>
+<span id="L341" class="LineNr"> 341 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L342" class="LineNr"> 342 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!refinement_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L343" class="LineNr"> 343 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_refinement_type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*refinement_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">);</span>
+<span id="L344" class="LineNr"> 344 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L345" class="LineNr"> 345 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L346" class="LineNr"> 346 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;adding mapping from &quot;</span> &lt;&lt; exemplar_type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>curr_refinement_type<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L347" class="LineNr"> 347 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*curr_refinement_type<span class="Delimiter">));</span>
+<span id="L348" class="LineNr"> 348 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L349" class="LineNr"> 349 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L350" class="LineNr"> 350 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">),</span> curr_refinement_type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L351" class="LineNr"> 351 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;no call found for '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>call_instruction<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L352" class="LineNr"> 352 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> *error = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L353" class="LineNr"> 353 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> curr_refinement_type<span class="Delimiter">;</span>
+<span id="L354" class="LineNr"> 354 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L355" class="LineNr"> 355 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L356" class="LineNr"> 356 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L357" class="LineNr"> 357 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L358" class="LineNr"> 358 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> exemplar_type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">,</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*curr_refinement_type<span class="Delimiter">));</span>
+<span id="L359" class="LineNr"> 359 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L360" class="LineNr"> 360 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L361" class="LineNr"> 361 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> curr_refinement_type<span class="Delimiter">;</span>
+<span id="L362" class="LineNr"> 362 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L363" class="LineNr"> 363 </span>  <span class="Delimiter">}</span>
 <span id="L364" class="LineNr"> 364 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L365" class="LineNr"> 365 </span>    accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> refinement_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> exemplar_reagent<span class="Delimiter">,</span> call_instruction<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
-<span id="L366" class="LineNr"> 366 </span>    accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> refinement_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> exemplar_reagent<span class="Delimiter">,</span> call_instruction<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
+<span id="L365" class="LineNr"> 365 </span>  <span class="Conceal">¦</span> accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> refinement_type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> exemplar_reagent<span class="Delimiter">,</span> call_instruction<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
+<span id="L366" class="LineNr"> 366 </span>  <span class="Conceal">¦</span> accumulate_type_ingredients<span class="Delimiter">(</span>exemplar_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> refinement_type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> mappings<span class="Delimiter">,</span> exemplar<span class="Delimiter">,</span> exemplar_reagent<span class="Delimiter">,</span> call_instruction<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">,</span> error<span class="Delimiter">);</span>
 <span id="L367" class="LineNr"> 367 </span>  <span class="Delimiter">}</span>
 <span id="L368" class="LineNr"> 368 </span><span class="Delimiter">}</span>
 <span id="L369" class="LineNr"> 369 </span>
@@ -437,25 +438,25 @@ if ('onhashchange' in window) {
 <span id="L372" class="LineNr"> 372 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>mappings<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L373" class="LineNr"> 373 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replacing in <a href='010vm.cc.html#L19'>recipe</a> header ingredients&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L374" class="LineNr"> 374 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L375" class="LineNr"> 375 </span>    replace_type_ingredients<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
+<span id="L375" class="LineNr"> 375 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
 <span id="L376" class="LineNr"> 376 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replacing in <a href='010vm.cc.html#L19'>recipe</a> header products&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L377" class="LineNr"> 377 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L378" class="LineNr"> 378 </span>    replace_type_ingredients<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
+<span id="L378" class="LineNr"> 378 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
 <span id="L379" class="LineNr"> 379 </span>  <span class="Comment">// update its body</span>
 <span id="L380" class="LineNr"> 380 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L381" class="LineNr"> 381 </span>    instruction&amp; inst = new_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L382" class="LineNr"> 382 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replacing in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L383" class="LineNr"> 383 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
-<span id="L384" class="LineNr"> 384 </span>      replace_type_ingredients<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
-<span id="L385" class="LineNr"> 385 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
-<span id="L386" class="LineNr"> 386 </span>      replace_type_ingredients<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
-<span id="L387" class="LineNr"> 387 </span>    <span class="Comment">// special-case for new: replace type ingredient in first ingredient *value*</span>
-<span id="L388" class="LineNr"> 388 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;new&quot;</span> &amp;&amp; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L389" class="LineNr"> 389 </span>      type_tree* type = <a href='056shape_shifting_recipe.cc.html#L454'>parse_type_tree</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
-<span id="L390" class="LineNr"> 390 </span>      replace_type_ingredients<span class="Delimiter">(</span>type<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
-<span id="L391" class="LineNr"> 391 </span>      inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name = inspect<span class="Delimiter">(</span>type<span class="Delimiter">);</span>
-<span id="L392" class="LineNr"> 392 </span>      <span class="Normal">delete</span> type<span class="Delimiter">;</span>
-<span id="L393" class="LineNr"> 393 </span>    <span class="Delimiter">}</span>
+<span id="L381" class="LineNr"> 381 </span>  <span class="Conceal">¦</span> instruction&amp; inst = new_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L382" class="LineNr"> 382 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replacing in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L383" class="LineNr"> 383 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
+<span id="L384" class="LineNr"> 384 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
+<span id="L385" class="LineNr"> 385 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
+<span id="L386" class="LineNr"> 386 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> mappings<span class="Delimiter">,</span> new_recipe<span class="Delimiter">);</span>
+<span id="L387" class="LineNr"> 387 </span>  <span class="Conceal">¦</span> <span class="Comment">// special-case for new: replace type ingredient in first ingredient *value*</span>
+<span id="L388" class="LineNr"> 388 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;new&quot;</span> &amp;&amp; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L389" class="LineNr"> 389 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> type_tree* type = <a href='056shape_shifting_recipe.cc.html#L454'>parse_type_tree</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L390" class="LineNr"> 390 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>type<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
+<span id="L391" class="LineNr"> 391 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name = inspect<span class="Delimiter">(</span>type<span class="Delimiter">);</span>
+<span id="L392" class="LineNr"> 392 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">delete</span> type<span class="Delimiter">;</span>
+<span id="L393" class="LineNr"> 393 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L394" class="LineNr"> 394 </span>  <span class="Delimiter">}</span>
 <span id="L395" class="LineNr"> 395 </span><span class="Delimiter">}</span>
 <span id="L396" class="LineNr"> 396 </span>
@@ -463,8 +464,8 @@ if ('onhashchange' in window) {
 <span id="L398" class="LineNr"> 398 </span>  string before = <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L399" class="LineNr"> 399 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;replacing in ingredient &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L400" class="LineNr"> 400 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L401" class="LineNr"> 401 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;specializing &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>original_name &lt;&lt; <span class="Constant">&quot;: missing type for '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L402" class="LineNr"> 402 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L401" class="LineNr"> 401 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;specializing &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>original_name &lt;&lt; <span class="Constant">&quot;: missing type for '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L402" class="LineNr"> 402 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L403" class="LineNr"> 403 </span>  <span class="Delimiter">}</span>
 <span id="L404" class="LineNr"> 404 </span>  replace_type_ingredients<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
 <span id="L405" class="LineNr"> 405 </span><span class="Delimiter">}</span>
@@ -472,30 +473,30 @@ if ('onhashchange' in window) {
 <span id="L407" class="LineNr"> 407 </span><span class="Normal">void</span> replace_type_ingredients<span class="Delimiter">(</span>type_tree* type<span class="Delimiter">,</span> <span class="Normal">const</span> map&lt;string<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree*&gt;&amp; mappings<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L408" class="LineNr"> 408 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L409" class="LineNr"> 409 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L410" class="LineNr"> 410 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; type<span class="Delimiter">-&gt;</span>left != <span class="Constant">NULL</span> &amp;&amp; type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; contains_key<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> &amp;&amp; !get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)-&gt;</span>atom &amp;&amp; get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)-&gt;</span>right != <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L411" class="LineNr"> 411 </span>      *type = *get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
-<span id="L412" class="LineNr"> 412 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L413" class="LineNr"> 413 </span>    <span class="Delimiter">}</span>
-<span id="L414" class="LineNr"> 414 </span>    replace_type_ingredients<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
-<span id="L415" class="LineNr"> 415 </span>    replace_type_ingredients<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
-<span id="L416" class="LineNr"> 416 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L410" class="LineNr"> 410 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; type<span class="Delimiter">-&gt;</span>left != <span class="Constant">NULL</span> &amp;&amp; type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; contains_key<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> &amp;&amp; !get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)-&gt;</span>atom &amp;&amp; get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)-&gt;</span>right != <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L411" class="LineNr"> 411 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *type = *get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L412" class="LineNr"> 412 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L413" class="LineNr"> 413 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L414" class="LineNr"> 414 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
+<span id="L415" class="LineNr"> 415 </span>  <span class="Conceal">¦</span> replace_type_ingredients<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> mappings<span class="Delimiter">);</span>
+<span id="L416" class="LineNr"> 416 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L417" class="LineNr"> 417 </span>  <span class="Delimiter">}</span>
 <span id="L418" class="LineNr"> 418 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span>  <span class="Comment">// todo: ugly side effect</span>
-<span id="L419" class="LineNr"> 419 </span>    type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L419" class="LineNr"> 419 </span>  <span class="Conceal">¦</span> type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L420" class="LineNr"> 420 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span>
-<span id="L421" class="LineNr"> 421 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L421" class="LineNr"> 421 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L422" class="LineNr"> 422 </span>  <span class="Normal">const</span> type_tree* replacement = get<span class="Delimiter">(</span>mappings<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L423" class="LineNr"> 423 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; type<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot; =&gt; &quot;</span> &lt;&lt; names_to_string<span class="Delimiter">(</span>replacement<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L424" class="LineNr"> 424 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>replacement<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L425" class="LineNr"> 425 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> replacement<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L426" class="LineNr"> 426 </span>      <span class="Comment">// error in program; should be reported elsewhere</span>
-<span id="L427" class="LineNr"> 427 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L428" class="LineNr"> 428 </span>    <span class="Delimiter">}</span>
-<span id="L429" class="LineNr"> 429 </span>    type<span class="Delimiter">-&gt;</span>name = <span class="Delimiter">(</span>replacement<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span> ? <span class="Constant">&quot;number&quot;</span> : replacement<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
-<span id="L430" class="LineNr"> 430 </span>    type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
+<span id="L425" class="LineNr"> 425 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> replacement<span class="Delimiter">-&gt;</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L426" class="LineNr"> 426 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// error in program; should be reported elsewhere</span>
+<span id="L427" class="LineNr"> 427 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L428" class="LineNr"> 428 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L429" class="LineNr"> 429 </span>  <span class="Conceal">¦</span> type<span class="Delimiter">-&gt;</span>name = <span class="Delimiter">(</span>replacement<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span> ? <span class="Constant">&quot;number&quot;</span> : replacement<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L430" class="LineNr"> 430 </span>  <span class="Conceal">¦</span> type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>name<span class="Delimiter">);</span>
 <span id="L431" class="LineNr"> 431 </span>  <span class="Delimiter">}</span>
 <span id="L432" class="LineNr"> 432 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L433" class="LineNr"> 433 </span>    *type = *replacement<span class="Delimiter">;</span>
+<span id="L433" class="LineNr"> 433 </span>  <span class="Conceal">¦</span> *type = *replacement<span class="Delimiter">;</span>
 <span id="L434" class="LineNr"> 434 </span>  <span class="Delimiter">}</span>
 <span id="L435" class="LineNr"> 435 </span><span class="Delimiter">}</span>
 <span id="L436" class="LineNr"> 436 </span>
@@ -503,9 +504,9 @@ if ('onhashchange' in window) {
 <span id="L438" class="LineNr"> 438 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variant<span class="Delimiter">);</span>
 <span id="L439" class="LineNr"> 439 </span>  set&lt;string&gt; type_ingredients<span class="Delimiter">;</span>
 <span id="L440" class="LineNr"> 440 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L441" class="LineNr"> 441 </span>    accumulate_type_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> type_ingredients<span class="Delimiter">);</span>
+<span id="L441" class="LineNr"> 441 </span>  <span class="Conceal">¦</span> accumulate_type_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> type_ingredients<span class="Delimiter">);</span>
 <span id="L442" class="LineNr"> 442 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L443" class="LineNr"> 443 </span>    accumulate_type_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> type_ingredients<span class="Delimiter">);</span>
+<span id="L443" class="LineNr"> 443 </span>  <span class="Conceal">¦</span> accumulate_type_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> type_ingredients<span class="Delimiter">);</span>
 <span id="L444" class="LineNr"> 444 </span>  <span class="Identifier">return</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>type_ingredients<span class="Delimiter">);</span>
 <span id="L445" class="LineNr"> 445 </span><span class="Delimiter">}</span>
 <span id="L446" class="LineNr"> 446 </span>
@@ -531,16 +532,16 @@ if ('onhashchange' in window) {
 <span id="L466" class="LineNr"> 466 </span>
 <span id="L467" class="LineNr"> 467 </span><span class="Normal">void</span> <a href='056shape_shifting_recipe.cc.html#L467'>dump_inspect</a><span class="Delimiter">(</span><span class="Normal">const</span> type_tree* x<span class="Delimiter">,</span> ostream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L468" class="LineNr"> 468 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">-&gt;</span>left &amp;&amp; !x<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L469" class="LineNr"> 469 </span>    out &lt;&lt; x<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
-<span id="L470" class="LineNr"> 470 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L469" class="LineNr"> 469 </span>  <span class="Conceal">¦</span> out &lt;&lt; x<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L470" class="LineNr"> 470 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L471" class="LineNr"> 471 </span>  <span class="Delimiter">}</span>
 <span id="L472" class="LineNr"> 472 </span>  out &lt;&lt; <span class="Constant">'('</span><span class="Delimiter">;</span>
 <span id="L473" class="LineNr"> 473 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">const</span> type_tree* curr = x<span class="Delimiter">;</span>  curr<span class="Delimiter">;</span>  curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L474" class="LineNr"> 474 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr != x<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L475" class="LineNr"> 475 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
-<span id="L476" class="LineNr"> 476 </span>      <a href='056shape_shifting_recipe.cc.html#L467'>dump_inspect</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
-<span id="L477" class="LineNr"> 477 </span>    <span class="Normal">else</span>
-<span id="L478" class="LineNr"> 478 </span>      out &lt;&lt; curr<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L474" class="LineNr"> 474 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr != x<span class="Delimiter">)</span> out &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L475" class="LineNr"> 475 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
+<span id="L476" class="LineNr"> 476 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='056shape_shifting_recipe.cc.html#L467'>dump_inspect</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
+<span id="L477" class="LineNr"> 477 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L478" class="LineNr"> 478 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; curr<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
 <span id="L479" class="LineNr"> 479 </span>  <span class="Delimiter">}</span>
 <span id="L480" class="LineNr"> 480 </span>  out &lt;&lt; <span class="Constant">')'</span><span class="Delimiter">;</span>
 <span id="L481" class="LineNr"> 481 </span><span class="Delimiter">}</span>
@@ -548,27 +549,27 @@ if ('onhashchange' in window) {
 <span id="L483" class="LineNr"> 483 </span><span class="Normal">void</span> ensure_all_concrete_types<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> recipe&amp; new_recipe<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; exemplar<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L484" class="LineNr"> 484 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;-- ensure all concrete types in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; new_recipe<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L485" class="LineNr"> 485 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L486" class="LineNr"> 486 </span>    ensure_all_concrete_types<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
+<span id="L486" class="LineNr"> 486 </span>  <span class="Conceal">¦</span> ensure_all_concrete_types<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
 <span id="L487" class="LineNr"> 487 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L488" class="LineNr"> 488 </span>    ensure_all_concrete_types<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
+<span id="L488" class="LineNr"> 488 </span>  <span class="Conceal">¦</span> ensure_all_concrete_types<span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
 <span id="L489" class="LineNr"> 489 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>new_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L490" class="LineNr"> 490 </span>    instruction&amp; inst = new_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L491" class="LineNr"> 491 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
-<span id="L492" class="LineNr"> 492 </span>      ensure_all_concrete_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
-<span id="L493" class="LineNr"> 493 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
-<span id="L494" class="LineNr"> 494 </span>      ensure_all_concrete_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
+<span id="L490" class="LineNr"> 490 </span>  <span class="Conceal">¦</span> instruction&amp; inst = new_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L491" class="LineNr"> 491 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
+<span id="L492" class="LineNr"> 492 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ensure_all_concrete_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
+<span id="L493" class="LineNr"> 493 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span>
+<span id="L494" class="LineNr"> 494 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ensure_all_concrete_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> exemplar<span class="Delimiter">);</span>
 <span id="L495" class="LineNr"> 495 </span>  <span class="Delimiter">}</span>
 <span id="L496" class="LineNr"> 496 </span><span class="Delimiter">}</span>
 <span id="L497" class="LineNr"> 497 </span>
 <span id="L498" class="LineNr"> 498 </span><span class="Normal">void</span> ensure_all_concrete_types<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">const</span><span class="Comment">*/</span> reagent&amp; x<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; exemplar<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L499" class="LineNr"> 499 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type || contains_type_ingredient_name<span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L500" class="LineNr"> 500 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to map a type to &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L501" class="LineNr"> 501 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// just to prevent crashes later</span>
-<span id="L502" class="LineNr"> 502 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L500" class="LineNr"> 500 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to map a type to &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L501" class="LineNr"> 501 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> x<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;&quot;</span><span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// just to prevent crashes later</span>
+<span id="L502" class="LineNr"> 502 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L503" class="LineNr"> 503 </span>  <span class="Delimiter">}</span>
 <span id="L504" class="LineNr"> 504 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L505" class="LineNr"> 505 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to map a type to the unknown &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L506" class="LineNr"> 506 </span>    <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L505" class="LineNr"> 505 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>exemplar<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to map a type to the unknown &quot;</span> &lt;&lt; x<span class="Delimiter">.</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L506" class="LineNr"> 506 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L507" class="LineNr"> 507 </span>  <span class="Delimiter">}</span>
 <span id="L508" class="LineNr"> 508 </span><span class="Delimiter">}</span>
 <span id="L509" class="LineNr"> 509 </span>
@@ -707,21 +708,21 @@ if ('onhashchange' in window) {
 <span id="L642" class="LineNr"> 642 </span><span class="Comment">// this one needs a little more fine-grained control</span>
 <span id="L643" class="LineNr"> 643 </span><span class="Normal">void</span> <a href='056shape_shifting_recipe.cc.html#L643'>test_shape_shifting_new_ingredient_does_not_pollute_global_namespace</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L644" class="LineNr"> 644 </span>  <span class="Comment">// if you specialize a shape-shifting recipe that allocates a type-ingredient..</span>
-<span id="L645" class="LineNr"> 645 </span>  <a href='012transform.cc.html#L98'>transform</a><span class="Delimiter">(</span><span class="Constant">&quot;def barz x:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L646" class="LineNr"> 646 </span>            <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L647" class="LineNr"> 647 </span>            <span class="Constant">&quot;  load-ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L648" class="LineNr"> 648 </span>            <span class="Constant">&quot;  y:&amp;:num &lt;- new _elem:type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L649" class="LineNr"> 649 </span>            <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L650" class="LineNr"> 650 </span>            <span class="Constant">&quot;def fooz [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L651" class="LineNr"> 651 </span>            <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L652" class="LineNr"> 652 </span>            <span class="Constant">&quot;  barz 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L653" class="LineNr"> 653 </span>            <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L645" class="LineNr"> 645 </span>  <a href='012transform.cc.html#L99'>transform</a><span class="Delimiter">(</span><span class="Constant">&quot;def barz x:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L646" class="LineNr"> 646 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L647" class="LineNr"> 647 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  load-ingredients</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L648" class="LineNr"> 648 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:&amp;:num &lt;- new _elem:type</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L649" class="LineNr"> 649 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L650" class="LineNr"> 650 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;def fooz [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L651" class="LineNr"> 651 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  local-scope</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L652" class="LineNr"> 652 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  barz 34</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L653" class="LineNr"> 653 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L654" class="LineNr"> 654 </span>  <span class="Comment">// ..and if you then try to load a new shape-shifting container with that</span>
 <span id="L655" class="LineNr"> 655 </span>  <span class="Comment">// type-ingredient</span>
 <span id="L656" class="LineNr"> 656 </span>  run<span class="Delimiter">(</span><span class="Constant">&quot;container foo:_elem [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L657" class="LineNr"> 657 </span>      <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L658" class="LineNr"> 658 </span>      <span class="Constant">&quot;  y:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
-<span id="L659" class="LineNr"> 659 </span>      <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L657" class="LineNr"> 657 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  x:_elem</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L658" class="LineNr"> 658 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;  y:num</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span>
+<span id="L659" class="LineNr"> 659 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L660" class="LineNr"> 660 </span>  <span class="Comment">// then it should work as usual</span>
 <span id="L661" class="LineNr"> 661 </span>  reagent callsite<span class="Delimiter">(</span><span class="Constant">&quot;x:foo:point&quot;</span><span class="Delimiter">);</span>
 <span id="L662" class="LineNr"> 662 </span>  reagent element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>callsite<span class="Delimiter">.</span>type<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
@@ -960,8 +961,8 @@ if ('onhashchange' in window) {
 <span id="L895" class="LineNr"> 895 </span>  local-scope
 <span id="L896" class="LineNr"> 896 </span>  load-ingredients
 <span id="L897" class="LineNr"> 897 </span>  <span class="Delimiter">{</span>
-<span id="L898" class="LineNr"> 898 </span>    <span class="Identifier">break</span>
-<span id="L899" class="LineNr"> 899 </span>    <span class="Normal">y</span>:num<span class="Special"> &lt;- </span>foo x
+<span id="L898" class="LineNr"> 898 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>
+<span id="L899" class="LineNr"> 899 </span>  <span class="Conceal">¦</span> <span class="Normal">y</span>:num<span class="Special"> &lt;- </span>foo x
 <span id="L900" class="LineNr"> 900 </span>  <span class="Delimiter">}</span>
 <span id="L901" class="LineNr"> 901 </span>  <span class="Identifier">return</span> y
 <span id="L902" class="LineNr"> 902 </span>]
diff --git a/html/057immutable.cc.html b/html/057immutable.cc.html
index 99147f16..ae7eee7b 100644
--- a/html/057immutable.cc.html
+++ b/html/057immutable.cc.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
 .Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.traceContains { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.cSpecial { color: #008000; }
+.muData { color: #ffff00; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
-.cSpecial { color: #008000; }
+.Constant { color: #00a0a0; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -409,48 +410,48 @@ if ('onhashchange' in window) {
 <span id="L347" class="LineNr">347 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- check mutability of ingredients in <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L348" class="LineNr">348 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// skip check for old-style recipes calling next-ingredient directly</span>
 <span id="L349" class="LineNr">349 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L350" class="LineNr">350 </span>    <span class="Normal">const</span> reagent&amp; current_ingredient = caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L351" class="LineNr">351 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span>caller<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// not expected to be immutable</span>
-<span id="L352" class="LineNr">352 </span>    <span class="Comment">// End Immutable Ingredients Special-cases</span>
-<span id="L353" class="LineNr">353 </span>    set&lt;reagent&gt; immutable_vars<span class="Delimiter">;</span>
-<span id="L354" class="LineNr">354 </span>    immutable_vars<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
-<span id="L355" class="LineNr">355 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L356" class="LineNr">356 </span>      <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L357" class="LineNr">357 </span>      <a href='057immutable.cc.html#L438'>check_immutable_ingredient_in_instruction</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">,</span> caller<span class="Delimiter">);</span>
-<span id="L358" class="LineNr">358 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == INDEX &amp;&amp; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span> &amp;&amp; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name == current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L359" class="LineNr">359 </span>      <a href='057immutable.cc.html#L364'>update_aliases</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">);</span>
-<span id="L360" class="LineNr">360 </span>    <span class="Delimiter">}</span>
+<span id="L350" class="LineNr">350 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; current_ingredient = caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span>caller<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// not expected to be immutable</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Immutable Ingredients Special-cases</span>
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> set&lt;reagent&gt; immutable_vars<span class="Delimiter">;</span>
+<span id="L354" class="LineNr">354 </span>  <span class="Conceal">¦</span> immutable_vars<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
+<span id="L355" class="LineNr">355 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L356" class="LineNr">356 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='057immutable.cc.html#L438'>check_immutable_ingredient_in_instruction</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">,</span> current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">,</span> caller<span class="Delimiter">);</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == INDEX &amp;&amp; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span> &amp;&amp; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name == current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='057immutable.cc.html#L364'>update_aliases</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> immutable_vars<span class="Delimiter">);</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L361" class="LineNr">361 </span>  <span class="Delimiter">}</span>
 <span id="L362" class="LineNr">362 </span><span class="Delimiter">}</span>
 <span id="L363" class="LineNr">363 </span>
 <span id="L364" class="LineNr">364 </span><span class="Normal">void</span> <a href='057immutable.cc.html#L364'>update_aliases</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> set&lt;reagent&gt;&amp; current_ingredient_and_aliases<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L365" class="LineNr">365 </span>  set&lt;<span class="Normal">int</span>&gt; current_ingredient_indices = <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span>
 <span id="L366" class="LineNr">366 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L367" class="LineNr">367 </span>    <span class="Comment">// primitive recipe</span>
-<span id="L368" class="LineNr">368 </span>    <span class="Normal">switch</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L369" class="LineNr">369 </span>      <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>:
-<span id="L370" class="LineNr">370 </span>        <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;<span class="Normal">int</span>&gt;::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != current_ingredient_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
-<span id="L371" class="LineNr">371 </span>          current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
-<span id="L372" class="LineNr">372 </span>        <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L373" class="LineNr">373 </span>      <span class="Normal">case</span> GET:
-<span id="L374" class="LineNr">374 </span>      <span class="Normal">case</span> INDEX:
-<span id="L375" class="LineNr">375 </span>      <span class="Normal">case</span> MAYBE_CONVERT:
-<span id="L376" class="LineNr">376 </span>        <span class="Comment">// current_ingredient_indices can only have 0 or one value</span>
-<span id="L377" class="LineNr">377 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L378" class="LineNr">378 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_exclusive_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
-<span id="L379" class="LineNr">379 </span>            current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
-<span id="L380" class="LineNr">380 </span>        <span class="Delimiter">}</span>
-<span id="L381" class="LineNr">381 </span>        <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L382" class="LineNr">382 </span>      <span class="Normal">default</span>: <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L383" class="LineNr">383 </span>    <span class="Delimiter">}</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span> <span class="Comment">// primitive recipe</span>
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span> <span class="Normal">switch</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> <a href='010vm.cc.html#L189'>COPY</a>:
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;<span class="Normal">int</span>&gt;::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != current_ingredient_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> GET:
+<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> INDEX:
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> MAYBE_CONVERT:
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// current_ingredient_indices can only have 0 or one value</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; !inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L378" class="LineNr">378 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || is_mu_exclusive_container<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span>
+<span id="L379" class="LineNr">379 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L380" class="LineNr">380 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">default</span>: <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L384" class="LineNr">384 </span>  <span class="Delimiter">}</span>
 <span id="L385" class="LineNr">385 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L386" class="LineNr">386 </span>    <span class="Comment">// defined recipe</span>
-<span id="L387" class="LineNr">387 </span>    set&lt;<span class="Normal">int</span>&gt; contained_in_product_indices = <a href='057immutable.cc.html#L395'>scan_contained_in_product_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_indices<span class="Delimiter">);</span>
-<span id="L388" class="LineNr">388 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;<span class="Normal">int</span>&gt;::iterator p = contained_in_product_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != contained_in_product_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L389" class="LineNr">389 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>*p &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
-<span id="L390" class="LineNr">390 </span>        current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
-<span id="L391" class="LineNr">391 </span>    <span class="Delimiter">}</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> <span class="Comment">// defined recipe</span>
+<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span> set&lt;<span class="Normal">int</span>&gt; contained_in_product_indices = <a href='057immutable.cc.html#L395'>scan_contained_in_product_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_indices<span class="Delimiter">);</span>
+<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;<span class="Normal">int</span>&gt;::iterator p = contained_in_product_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != contained_in_product_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*p &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> current_ingredient_and_aliases<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L392" class="LineNr">392 </span>  <span class="Delimiter">}</span>
 <span id="L393" class="LineNr">393 </span><span class="Delimiter">}</span>
 <span id="L394" class="LineNr">394 </span>
@@ -458,15 +459,15 @@ if ('onhashchange' in window) {
 <span id="L396" class="LineNr">396 </span>  set&lt;reagent&gt; selected_ingredients<span class="Delimiter">;</span>
 <span id="L397" class="LineNr">397 </span>  <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
 <span id="L398" class="LineNr">398 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;<span class="Normal">int</span>&gt;::iterator p = <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L399" class="LineNr">399 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*p &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// optional immutable ingredient</span>
-<span id="L400" class="LineNr">400 </span>    selected_ingredients<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*p &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// optional immutable ingredient</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> selected_ingredients<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>*p<span class="Delimiter">));</span>
 <span id="L401" class="LineNr">401 </span>  <span class="Delimiter">}</span>
 <span id="L402" class="LineNr">402 </span>  set&lt;<span class="Normal">int</span>&gt; result<span class="Delimiter">;</span>
 <span id="L403" class="LineNr">403 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L404" class="LineNr">404 </span>    <span class="Normal">const</span> reagent&amp; current_product = callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L405" class="LineNr">405 </span>    <span class="Normal">const</span> string_tree* contained_in_name = property<span class="Delimiter">(</span>current_product<span class="Delimiter">,</span> <span class="Constant">&quot;contained-in&quot;</span><span class="Delimiter">);</span>
-<span id="L406" class="LineNr">406 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contained_in_name &amp;&amp; selected_ingredients<span class="Delimiter">.</span>find<span class="Delimiter">(</span>contained_in_name<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> != selected_ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
-<span id="L407" class="LineNr">407 </span>      result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L404" class="LineNr">404 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; current_product = callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> string_tree* contained_in_name = property<span class="Delimiter">(</span>current_product<span class="Delimiter">,</span> <span class="Constant">&quot;contained-in&quot;</span><span class="Delimiter">);</span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contained_in_name &amp;&amp; selected_ingredients<span class="Delimiter">.</span>find<span class="Delimiter">(</span>contained_in_name<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> != selected_ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
 <span id="L408" class="LineNr">408 </span>  <span class="Delimiter">}</span>
 <span id="L409" class="LineNr">409 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L410" class="LineNr">410 </span><span class="Delimiter">}</span>
@@ -500,56 +501,56 @@ if ('onhashchange' in window) {
 <span id="L438" class="LineNr">438 </span><span class="Normal">void</span> <a href='057immutable.cc.html#L438'>check_immutable_ingredient_in_instruction</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> set&lt;reagent&gt;&amp; current_ingredient_and_aliases<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; original_ingredient_name<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L439" class="LineNr">439 </span>  <span class="Comment">// first check if the instruction is directly modifying something it shouldn't</span>
 <span id="L440" class="LineNr">440 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L441" class="LineNr">441 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">)</span>
-<span id="L442" class="LineNr">442 </span>        &amp;&amp; current_ingredient_and_aliases<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != current_ingredient_and_aliases<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L443" class="LineNr">443 </span>      string current_product_name = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
-<span id="L444" class="LineNr">444 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>current_product_name == original_ingredient_name<span class="Delimiter">)</span>
-<span id="L445" class="LineNr">445 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_product_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because it's an ingredient of recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L446" class="LineNr">446 </span>      <span class="Normal">else</span>
-<span id="L447" class="LineNr">447 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_product_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because that would modify &quot;</span> &lt;&lt; original_ingredient_name &lt;&lt; <span class="Constant">&quot; which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L448" class="LineNr">448 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L449" class="LineNr">449 </span>    <span class="Delimiter">}</span>
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">&quot;lookup&quot;</span><span class="Delimiter">)</span>
+<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; current_ingredient_and_aliases<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != current_ingredient_and_aliases<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> string current_product_name = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
+<span id="L444" class="LineNr">444 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_product_name == original_ingredient_name<span class="Delimiter">)</span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_product_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because it's an ingredient of recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_product_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because that would modify &quot;</span> &lt;&lt; original_ingredient_name &lt;&lt; <span class="Constant">&quot; which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L450" class="LineNr">450 </span>  <span class="Delimiter">}</span>
 <span id="L451" class="LineNr">451 </span>  <span class="Comment">// check if there's any indirect modification going on</span>
 <span id="L452" class="LineNr">452 </span>  set&lt;<span class="Normal">int</span>&gt; current_ingredient_indices = <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">(</span>inst<span class="Delimiter">,</span> current_ingredient_and_aliases<span class="Delimiter">);</span>
 <span id="L453" class="LineNr">453 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_indices<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// ingredient not found in call</span>
 <span id="L454" class="LineNr">454 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;<span class="Normal">int</span>&gt;::iterator p = current_ingredient_indices<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != current_ingredient_indices<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L455" class="LineNr">455 </span>    <span class="Normal">const</span> <span class="Normal">int</span> current_ingredient_index = *p<span class="Delimiter">;</span>
-<span id="L456" class="LineNr">456 </span>    reagent current_ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_ingredient_index<span class="Delimiter">);</span>
-<span id="L457" class="LineNr">457 </span>    canonize_type<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
-<span id="L458" class="LineNr">458 </span>    <span class="Normal">const</span> string&amp; current_ingredient_name = current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
-<span id="L459" class="LineNr">459 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L460" class="LineNr">460 </span>      <span class="Comment">// primitive recipe</span>
-<span id="L461" class="LineNr">461 </span>      <span class="Comment">// we got here only because we got an instruction with an implicit product, and the instruction didn't explicitly spell it out</span>
-<span id="L462" class="LineNr">462 </span>      <span class="Comment">//    put x, y:offset, z</span>
-<span id="L463" class="LineNr">463 </span>      <span class="Comment">// instead of</span>
-<span id="L464" class="LineNr">464 </span>      <span class="Comment">//    x &lt;- put x, y:offset, z</span>
-<span id="L465" class="LineNr">465 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == PUT || inst<span class="Delimiter">.</span>operation == PUT_INDEX<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L466" class="LineNr">466 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_index == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L467" class="LineNr">467 </span>          <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
-<span id="L468" class="LineNr">468 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because it's an ingredient of recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L469" class="LineNr">469 </span>          <span class="Normal">else</span>
-<span id="L470" class="LineNr">470 </span>            <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because that would modify '&quot;</span> &lt;&lt; original_ingredient_name &lt;&lt; <span class="Constant">&quot;' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L471" class="LineNr">471 </span>        <span class="Delimiter">}</span>
-<span id="L472" class="LineNr">472 </span>      <span class="Delimiter">}</span>
-<span id="L473" class="LineNr">473 </span>    <span class="Delimiter">}</span>
-<span id="L474" class="LineNr">474 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L475" class="LineNr">475 </span>      <span class="Comment">// defined recipe</span>
-<span id="L476" class="LineNr">476 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='057immutable.cc.html#L486'>is_modified_in_recipe</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">,</span> current_ingredient_index<span class="Delimiter">,</span> caller<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L477" class="LineNr">477 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
-<span id="L478" class="LineNr">478 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because it's an ingredient of recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L479" class="LineNr">479 </span>        <span class="Normal">else</span>
-<span id="L480" class="LineNr">480 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because that would modify '&quot;</span> &lt;&lt; original_ingredient_name &lt;&lt; <span class="Constant">&quot;' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L481" class="LineNr">481 </span>      <span class="Delimiter">}</span>
-<span id="L482" class="LineNr">482 </span>    <span class="Delimiter">}</span>
+<span id="L455" class="LineNr">455 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> <span class="Normal">int</span> current_ingredient_index = *p<span class="Delimiter">;</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span> reagent current_ingredient = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>current_ingredient_index<span class="Delimiter">);</span>
+<span id="L457" class="LineNr">457 </span>  <span class="Conceal">¦</span> canonize_type<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">);</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> string&amp; current_ingredient_name = current_ingredient<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// primitive recipe</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// we got here only because we got an instruction with an implicit product, and the instruction didn't explicitly spell it out</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">//    put x, y:offset, z</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// instead of</span>
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">//    x &lt;- put x, y:offset, z</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation == PUT || inst<span class="Delimiter">.</span>operation == PUT_INDEX<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_index == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because it's an ingredient of recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L469" class="LineNr">469 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because that would modify '&quot;</span> &lt;&lt; original_ingredient_name &lt;&lt; <span class="Constant">&quot;' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// defined recipe</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='057immutable.cc.html#L486'>is_modified_in_recipe</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">,</span> current_ingredient_index<span class="Delimiter">,</span> caller<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>current_ingredient_name == original_ingredient_name<span class="Delimiter">)</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because it's an ingredient of recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L479" class="LineNr">479 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;cannot modify '&quot;</span> &lt;&lt; current_ingredient_name &lt;&lt; <span class="Constant">&quot;' in <a href='010vm.cc.html#L32'>instruction</a> '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' because that would modify '&quot;</span> &lt;&lt; original_ingredient_name &lt;&lt; <span class="Constant">&quot;' which is an ingredient of <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; but not also a product</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L481" class="LineNr">481 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L482" class="LineNr">482 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L483" class="LineNr">483 </span>  <span class="Delimiter">}</span>
 <span id="L484" class="LineNr">484 </span><span class="Delimiter">}</span>
 <span id="L485" class="LineNr">485 </span>
 <span id="L486" class="LineNr">486 </span><span class="Normal">bool</span> <a href='057immutable.cc.html#L486'>is_modified_in_recipe</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">,</span> <span class="Normal">const</span> <span class="Normal">int</span> ingredient_index<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L487" class="LineNr">487 </span>  <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L488" class="LineNr">488 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L489" class="LineNr">489 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't check mutability of ingredients in recipe &quot;</span> &lt;&lt; callee<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; because it uses 'next-ingredient' directly, rather than a recipe header.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L490" class="LineNr">490 </span>    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L489" class="LineNr">489 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;can't check mutability of ingredients in recipe &quot;</span> &lt;&lt; callee<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; because it uses 'next-ingredient' directly, rather than a recipe header.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L490" class="LineNr">490 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L491" class="LineNr">491 </span>  <span class="Delimiter">}</span>
 <span id="L492" class="LineNr">492 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// optional immutable ingredient</span>
 <span id="L493" class="LineNr">493 </span>  <span class="Identifier">return</span> <a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span>callee<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">);</span>
@@ -557,8 +558,8 @@ if ('onhashchange' in window) {
 <span id="L495" class="LineNr">495 </span>
 <span id="L496" class="LineNr">496 </span><span class="Normal">bool</span> <a href='057immutable.cc.html#L496'>is_present_in_products</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; callee<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; ingredient_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L497" class="LineNr">497 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L498" class="LineNr">498 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
-<span id="L499" class="LineNr">499 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>callee<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name == ingredient_name<span class="Delimiter">)</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L500" class="LineNr">500 </span>  <span class="Delimiter">}</span>
 <span id="L501" class="LineNr">501 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L502" class="LineNr">502 </span><span class="Delimiter">}</span>
@@ -566,9 +567,9 @@ if ('onhashchange' in window) {
 <span id="L504" class="LineNr">504 </span>set&lt;<span class="Normal">int</span>&gt; <a href='057immutable.cc.html#L504'>ingredient_indices</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> set&lt;reagent&gt;&amp; ingredient_names<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L505" class="LineNr">505 </span>  set&lt;<span class="Normal">int</span>&gt; result<span class="Delimiter">;</span>
 <span id="L506" class="LineNr">506 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L507" class="LineNr">507 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L508" class="LineNr">508 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != ingredient_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
-<span id="L509" class="LineNr">509 </span>      result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L507" class="LineNr">507 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L508" class="LineNr">508 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != ingredient_names<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span>
+<span id="L509" class="LineNr">509 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
 <span id="L510" class="LineNr">510 </span>  <span class="Delimiter">}</span>
 <span id="L511" class="LineNr">511 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L512" class="LineNr">512 </span><span class="Delimiter">}</span>
@@ -617,9 +618,9 @@ if ('onhashchange' in window) {
 <span id="L555" class="LineNr">555 </span><span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">&quot;contained-in&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L556" class="LineNr">556 </span>  <span class="Normal">const</span> string_tree* tmp = property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">&quot;contained-in&quot;</span><span class="Delimiter">);</span>
 <span id="L557" class="LineNr">557 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!tmp<span class="Delimiter">-&gt;</span>atom
-<span id="L558" class="LineNr">558 </span>      || <span class="Delimiter">(</span>!is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span>
-<span id="L559" class="LineNr">559 </span>          &amp;&amp; !is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L560" class="LineNr">560 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;/contained-in can only point to another ingredient or product, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">&quot;contained-in&quot;</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L558" class="LineNr">558 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> || <span class="Delimiter">(</span>!is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span>
+<span id="L559" class="LineNr">559 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; !is_present_in_products<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> tmp<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L560" class="LineNr">560 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;/contained-in can only point to another ingredient or product, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>property<span class="Delimiter">(</span>current_ingredient<span class="Delimiter">,</span> <span class="Constant">&quot;contained-in&quot;</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L561" class="LineNr">561 </span>  <span class="Delimiter">}</span>
 <span id="L562" class="LineNr">562 </span>  <span class="Identifier">continue</span><span class="Delimiter">;</span>
 <span id="L563" class="LineNr">563 </span><span class="Delimiter">}</span>
diff --git a/html/058to_text.cc.html b/html/058to_text.cc.html
index d3b8b2cb..7d4ba1b7 100644
--- a/html/058to_text.cc.html
+++ b/html/058to_text.cc.html
@@ -16,12 +16,13 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -67,8 +68,8 @@ if ('onhashchange' in window) {
 <span id="L9" class="LineNr"> 9 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L10" class="LineNr">10 </span><span class="Normal">case</span> TO_TEXT: <span class="Delimiter">{</span>
 <span id="L11" class="LineNr">11 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L12" class="LineNr">12 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'to-text' requires a single ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L13" class="LineNr">13 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'to-text' requires a single ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L14" class="LineNr">14 </span>  <span class="Delimiter">}</span>
 <span id="L15" class="LineNr">15 </span>  <span class="Comment">// can handle any type</span>
 <span id="L16" class="LineNr">16 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
diff --git a/html/059to_text.mu.html b/html/059to_text.mu.html
index 7cf81afe..43d5e7f4 100644
--- a/html/059to_text.mu.html
+++ b/html/059to_text.mu.html
@@ -15,12 +15,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
 -->
 </style>
 
@@ -100,7 +101,7 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr">43 </span>  2:text <span class="Special">&lt;-</span> to-text 1:char
 <span id="L44" class="LineNr">44 </span>  3:@:char <span class="Special">&lt;-</span> copy *2:text
 <span id="L45" class="LineNr">45 </span>  memory-should-contain [
-<span id="L46" class="LineNr">46 </span>    3:array:character <span class="Special">&lt;-</span> <span class="Constant">[o]</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Conceal">¦</span> 3:array:character <span class="Special">&lt;-</span> <span class="Constant">[o]</span>
 <span id="L47" class="LineNr">47 </span>  ]
 <span id="L48" class="LineNr">48 </span>]
 </pre>
diff --git a/html/060rewrite_literal_string.cc.html b/html/060rewrite_literal_string.cc.html
index bccfbd07..50d77e90 100644
--- a/html/060rewrite_literal_string.cc.html
+++ b/html/060rewrite_literal_string.cc.html
@@ -16,14 +16,15 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -99,35 +100,35 @@ if ('onhashchange' in window) {
 <span id="L39" class="LineNr">39 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='060rewrite_literal_string.cc.html#L62'>contains_numeric_locations</a><span class="Delimiter">(</span>caller<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L40" class="LineNr">40 </span>  vector&lt;instruction&gt; new_instructions<span class="Delimiter">;</span>
 <span id="L41" class="LineNr">41 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L42" class="LineNr">42 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L43" class="LineNr">43 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>recipes_taking_literal_strings<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == recipes_taking_literal_strings<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L44" class="LineNr">44 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L45" class="LineNr">45 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L46" class="LineNr">46 </span>        <a href='010vm.cc.html#L32'>instruction</a> def<span class="Delimiter">;</span>
-<span id="L47" class="LineNr">47 </span>        ostringstream ingredient_name<span class="Delimiter">;</span>
-<span id="L48" class="LineNr">48 </span>        ingredient_name &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:text&quot;</span><span class="Delimiter">;</span>
-<span id="L49" class="LineNr">49 </span>        def<span class="Delimiter">.</span>name = <span class="Constant">&quot;new&quot;</span><span class="Delimiter">;</span>
-<span id="L50" class="LineNr">50 </span>        def<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
-<span id="L51" class="LineNr">51 </span>        def<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">()));</span>
-<span id="L52" class="LineNr">52 </span>        new_instructions<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>def<span class="Delimiter">);</span>
-<span id="L53" class="LineNr">53 </span>        inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">).</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>  <span class="Comment">// reclaim old memory</span>
-<span id="L54" class="LineNr">54 </span>        inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> = reagent<span class="Delimiter">(</span>ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
-<span id="L55" class="LineNr">55 </span>      <span class="Delimiter">}</span>
-<span id="L56" class="LineNr">56 </span>    <span class="Delimiter">}</span>
-<span id="L57" class="LineNr">57 </span>    new_instructions<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L42" class="LineNr">42 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L43" class="LineNr">43 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>recipes_taking_literal_strings<span class="Delimiter">.</span>find<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name<span class="Delimiter">)</span> == recipes_taking_literal_strings<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L44" class="LineNr">44 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L45" class="LineNr">45 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='010vm.cc.html#L32'>instruction</a> def<span class="Delimiter">;</span>
+<span id="L47" class="LineNr">47 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream ingredient_name<span class="Delimiter">;</span>
+<span id="L48" class="LineNr">48 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ingredient_name &lt;&lt; inst<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:text&quot;</span><span class="Delimiter">;</span>
+<span id="L49" class="LineNr">49 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> def<span class="Delimiter">.</span>name = <span class="Constant">&quot;new&quot;</span><span class="Delimiter">;</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> def<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">));</span>
+<span id="L51" class="LineNr">51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> def<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">()));</span>
+<span id="L52" class="LineNr">52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> new_instructions<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>def<span class="Delimiter">);</span>
+<span id="L53" class="LineNr">53 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">).</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>  <span class="Comment">// reclaim old memory</span>
+<span id="L54" class="LineNr">54 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> = reagent<span class="Delimiter">(</span>ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
+<span id="L55" class="LineNr">55 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L56" class="LineNr">56 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L57" class="LineNr">57 </span>  <span class="Conceal">¦</span> new_instructions<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
 <span id="L58" class="LineNr">58 </span>  <span class="Delimiter">}</span>
 <span id="L59" class="LineNr">59 </span>  caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>new_instructions<span class="Delimiter">);</span>
 <span id="L60" class="LineNr">60 </span><span class="Delimiter">}</span>
 <span id="L61" class="LineNr">61 </span>
 <span id="L62" class="LineNr">62 </span><span class="Normal">bool</span> <a href='060rewrite_literal_string.cc.html#L62'>contains_numeric_locations</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L63" class="LineNr">63 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L64" class="LineNr">64 </span>    <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L65" class="LineNr">65 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> in = <span class="Constant">0</span><span class="Delimiter">;</span>  in &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++in<span class="Delimiter">)</span>
-<span id="L66" class="LineNr">66 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='042name.cc.html#L141'>is_numeric_location</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>in<span class="Delimiter">)))</span>
-<span id="L67" class="LineNr">67 </span>        <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L68" class="LineNr">68 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> out = <span class="Constant">0</span><span class="Delimiter">;</span>  out &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++out<span class="Delimiter">)</span>
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diff --git a/html/061text.mu.html b/html/061text.mu.html
index c000e927..8e4df968 100644
--- a/html/061text.mu.html
+++ b/html/061text.mu.html
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+.Conceal { color: #4e4e4e; }
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+<span id="L15" class="LineNr">  15 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 99</span>, <span class="Constant">[text-equal]</span>, <span class="Constant">[comparing lengths]</span>
+<span id="L16" class="LineNr">  16 </span>  <span class="Conceal">¦</span> length-equal?:bool <span class="Special">&lt;-</span> equal a-len, b-len
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-<span id="L139" class="LineNr"> 139 </span>    <span class="Comment"># capacity not provided</span>
-<span id="L140" class="LineNr"> 140 </span>    <a href='075channel.mu.html#L379'>capacity</a> <span class="Special">&lt;-</span> copy<span class="Constant"> 10</span>
+<span id="L138" class="LineNr"> 138 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='075channel.mu.html#L379'>capacity</a>
+<span id="L139" class="LineNr"> 139 </span>  <span class="Conceal">¦</span> <span class="Comment"># capacity not provided</span>
+<span id="L140" class="LineNr"> 140 </span>  <span class="Conceal">¦</span> <a href='075channel.mu.html#L379'>capacity</a> <span class="Special">&lt;-</span> copy<span class="Constant"> 10</span>
 <span id="L141" class="LineNr"> 141 </span>  <span class="Delimiter">}</span>
 <span id="L142" class="LineNr"> 142 </span>  data:text <span class="Special">&lt;-</span> new <span class="Constant">character:type</span>, <a href='075channel.mu.html#L379'>capacity</a>
 <span id="L143" class="LineNr"> 143 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">data:offset</span>, data
@@ -216,12 +217,12 @@ if ('onhashchange' in window) {
 <span id="L156" class="LineNr"> 156 </span>  <span class="Comment"># copy old contents</span>
 <span id="L157" class="LineNr"> 157 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L158" class="LineNr"> 158 </span>  <span class="Delimiter">{</span>
-<span id="L159" class="LineNr"> 159 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, oldlen
-<span id="L160" class="LineNr"> 160 </span>    <span class="muControl">break-if</span> done?
-<span id="L161" class="LineNr"> 161 </span>    src:char <span class="Special">&lt;-</span> index *olddata, i
-<span id="L162" class="LineNr"> 162 </span>    *newdata <span class="Special">&lt;-</span> put-index *newdata, i, src
-<span id="L163" class="LineNr"> 163 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L164" class="LineNr"> 164 </span>    <span class="muControl">loop</span>
+<span id="L159" class="LineNr"> 159 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, oldlen
+<span id="L160" class="LineNr"> 160 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L161" class="LineNr"> 161 </span>  <span class="Conceal">¦</span> src:char <span class="Special">&lt;-</span> index *olddata, i
+<span id="L162" class="LineNr"> 162 </span>  <span class="Conceal">¦</span> *newdata <span class="Special">&lt;-</span> put-index *newdata, i, src
+<span id="L163" class="LineNr"> 163 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L164" class="LineNr"> 164 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L165" class="LineNr"> 165 </span>  <span class="Delimiter">}</span>
 <span id="L166" class="LineNr"> 166 </span>]
 <span id="L167" class="LineNr"> 167 </span>
@@ -242,12 +243,12 @@ if ('onhashchange' in window) {
 <span id="L182" class="LineNr"> 182 </span>  len:num <span class="Special">&lt;-</span> length *text
 <span id="L183" class="LineNr"> 183 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L184" class="LineNr"> 184 </span>  <span class="Delimiter">{</span>
-<span id="L185" class="LineNr"> 185 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L186" class="LineNr"> 186 </span>    <span class="muControl">break-if</span> done?
-<span id="L187" class="LineNr"> 187 </span>    c:char <span class="Special">&lt;-</span> index *text, i
-<span id="L188" class="LineNr"> 188 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L189" class="LineNr"> 189 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L190" class="LineNr"> 190 </span>    <span class="muControl">loop</span>
+<span id="L185" class="LineNr"> 185 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L186" class="LineNr"> 186 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L187" class="LineNr"> 187 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *text, i
+<span id="L188" class="LineNr"> 188 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L189" class="LineNr"> 189 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L190" class="LineNr"> 190 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L191" class="LineNr"> 191 </span>  <span class="Delimiter">}</span>
 <span id="L192" class="LineNr"> 192 </span>]
 <span id="L193" class="LineNr"> 193 </span>
@@ -256,20 +257,20 @@ if ('onhashchange' in window) {
 <span id="L196" class="LineNr"> 196 </span>  <span class="Constant">load-ingredients</span>
 <span id="L197" class="LineNr"> 197 </span>  len:num <span class="Special">&lt;-</span> get *buf, <span class="Constant">length:offset</span>
 <span id="L198" class="LineNr"> 198 </span>  <span class="Delimiter">{</span>
-<span id="L199" class="LineNr"> 199 </span>    <span class="Comment"># backspace? just drop last character if it exists and return</span>
-<span id="L200" class="LineNr"> 200 </span>    backspace?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">8/backspace</span>
-<span id="L201" class="LineNr"> 201 </span>    <span class="muControl">break-unless</span> backspace?
-<span id="L202" class="LineNr"> 202 </span>    empty?:bool <span class="Special">&lt;-</span> lesser-or-equal len,<span class="Constant"> 0</span>
-<span id="L203" class="LineNr"> 203 </span>    <span class="muControl">return-if</span> empty?
-<span id="L204" class="LineNr"> 204 </span>    len <span class="Special">&lt;-</span> subtract len,<span class="Constant"> 1</span>
-<span id="L205" class="LineNr"> 205 </span>    *buf <span class="Special">&lt;-</span> put *buf, <span class="Constant">length:offset</span>, len
-<span id="L206" class="LineNr"> 206 </span>    <span class="muControl">return</span>
+<span id="L199" class="LineNr"> 199 </span>  <span class="Conceal">¦</span> <span class="Comment"># backspace? just drop last character if it exists and return</span>
+<span id="L200" class="LineNr"> 200 </span>  <span class="Conceal">¦</span> backspace?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">8/backspace</span>
+<span id="L201" class="LineNr"> 201 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> backspace?
+<span id="L202" class="LineNr"> 202 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> lesser-or-equal len,<span class="Constant"> 0</span>
+<span id="L203" class="LineNr"> 203 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> empty?
+<span id="L204" class="LineNr"> 204 </span>  <span class="Conceal">¦</span> len <span class="Special">&lt;-</span> subtract len,<span class="Constant"> 1</span>
+<span id="L205" class="LineNr"> 205 </span>  <span class="Conceal">¦</span> *buf <span class="Special">&lt;-</span> put *buf, <span class="Constant">length:offset</span>, len
+<span id="L206" class="LineNr"> 206 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L207" class="LineNr"> 207 </span>  <span class="Delimiter">}</span>
 <span id="L208" class="LineNr"> 208 </span>  <span class="Delimiter">{</span>
-<span id="L209" class="LineNr"> 209 </span>    <span class="Comment"># grow buffer if necessary</span>
-<span id="L210" class="LineNr"> 210 </span>    full?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L168'>buffer-full?</a> buf
-<span id="L211" class="LineNr"> 211 </span>    <span class="muControl">break-unless</span> full?
-<span id="L212" class="LineNr"> 212 </span>    buf <span class="Special">&lt;-</span> <a href='061text.mu.html#L147'>grow-buffer</a> buf
+<span id="L209" class="LineNr"> 209 </span>  <span class="Conceal">¦</span> <span class="Comment"># grow buffer if necessary</span>
+<span id="L210" class="LineNr"> 210 </span>  <span class="Conceal">¦</span> full?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L168'>buffer-full?</a> buf
+<span id="L211" class="LineNr"> 211 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> full?
+<span id="L212" class="LineNr"> 212 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> <a href='061text.mu.html#L147'>grow-buffer</a> buf
 <span id="L213" class="LineNr"> 213 </span>  <span class="Delimiter">}</span>
 <span id="L214" class="LineNr"> 214 </span>  s:text <span class="Special">&lt;-</span> get *buf, <span class="Constant">data:offset</span>
 <span id="L215" class="LineNr"> 215 </span>  *s <span class="Special">&lt;-</span> put-index *s, len, c
@@ -283,12 +284,12 @@ if ('onhashchange' in window) {
 <span id="L223" class="LineNr"> 223 </span>  len:num <span class="Special">&lt;-</span> length *t
 <span id="L224" class="LineNr"> 224 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L225" class="LineNr"> 225 </span>  <span class="Delimiter">{</span>
-<span id="L226" class="LineNr"> 226 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L227" class="LineNr"> 227 </span>    <span class="muControl">break-if</span> done?
-<span id="L228" class="LineNr"> 228 </span>    c:char <span class="Special">&lt;-</span> index *t, i
-<span id="L229" class="LineNr"> 229 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L230" class="LineNr"> 230 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L231" class="LineNr"> 231 </span>    <span class="muControl">loop</span>
+<span id="L226" class="LineNr"> 226 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L227" class="LineNr"> 227 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L228" class="LineNr"> 228 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *t, i
+<span id="L229" class="LineNr"> 229 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L230" class="LineNr"> 230 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L231" class="LineNr"> 231 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L232" class="LineNr"> 232 </span>  <span class="Delimiter">}</span>
 <span id="L233" class="LineNr"> 233 </span>]
 <span id="L234" class="LineNr"> 234 </span>
@@ -296,17 +297,17 @@ if ('onhashchange' in window) {
 <span id="L236" class="LineNr"> 236 </span>  <span class="Constant">local-scope</span>
 <span id="L237" class="LineNr"> 237 </span>  x:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a>
 <span id="L238" class="LineNr"> 238 </span>  run [
-<span id="L239" class="LineNr"> 239 </span>    c:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
-<span id="L240" class="LineNr"> 240 </span>    x <span class="Special">&lt;-</span> append x, c
-<span id="L241" class="LineNr"> 241 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *x, <span class="Constant">length:offset</span>
-<span id="L242" class="LineNr"> 242 </span>    s:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
-<span id="L243" class="LineNr"> 243 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 0</span>
-<span id="L244" class="LineNr"> 244 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 1</span>
+<span id="L239" class="LineNr"> 239 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
+<span id="L240" class="LineNr"> 240 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> append x, c
+<span id="L241" class="LineNr"> 241 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *x, <span class="Constant">length:offset</span>
+<span id="L242" class="LineNr"> 242 </span>  <span class="Conceal">¦</span> s:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
+<span id="L243" class="LineNr"> 243 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 0</span>
+<span id="L244" class="LineNr"> 244 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 1</span>
 <span id="L245" class="LineNr"> 245 </span>  ]
 <span id="L246" class="LineNr"> 246 </span>  memory-should-contain [
-<span id="L247" class="LineNr"> 247 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># buffer length</span>
-<span id="L248" class="LineNr"> 248 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># a</span>
-<span id="L249" class="LineNr"> 249 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest of buffer is empty</span>
+<span id="L247" class="LineNr"> 247 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># buffer length</span>
+<span id="L248" class="LineNr"> 248 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># a</span>
+<span id="L249" class="LineNr"> 249 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest of buffer is empty</span>
 <span id="L250" class="LineNr"> 250 </span>  ]
 <span id="L251" class="LineNr"> 251 </span>]
 <span id="L252" class="LineNr"> 252 </span>
@@ -316,19 +317,19 @@ if ('onhashchange' in window) {
 <span id="L256" class="LineNr"> 256 </span>  c:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
 <span id="L257" class="LineNr"> 257 </span>  x <span class="Special">&lt;-</span> append x, c
 <span id="L258" class="LineNr"> 258 </span>  run [
-<span id="L259" class="LineNr"> 259 </span>    c <span class="Special">&lt;-</span> copy <span class="Constant">98/b</span>
-<span id="L260" class="LineNr"> 260 </span>    x <span class="Special">&lt;-</span> append x, c
-<span id="L261" class="LineNr"> 261 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *x, <span class="Constant">length:offset</span>
-<span id="L262" class="LineNr"> 262 </span>    s:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
-<span id="L263" class="LineNr"> 263 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 0</span>
-<span id="L264" class="LineNr"> 264 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 1</span>
-<span id="L265" class="LineNr"> 265 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 2</span>
+<span id="L259" class="LineNr"> 259 </span>  <span class="Conceal">¦</span> c <span class="Special">&lt;-</span> copy <span class="Constant">98/b</span>
+<span id="L260" class="LineNr"> 260 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> append x, c
+<span id="L261" class="LineNr"> 261 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *x, <span class="Constant">length:offset</span>
+<span id="L262" class="LineNr"> 262 </span>  <span class="Conceal">¦</span> s:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
+<span id="L263" class="LineNr"> 263 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 0</span>
+<span id="L264" class="LineNr"> 264 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 1</span>
+<span id="L265" class="LineNr"> 265 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> index *s,<span class="Constant"> 2</span>
 <span id="L266" class="LineNr"> 266 </span>  ]
 <span id="L267" class="LineNr"> 267 </span>  memory-should-contain [
-<span id="L268" class="LineNr"> 268 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># buffer length</span>
-<span id="L269" class="LineNr"> 269 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># a</span>
-<span id="L270" class="LineNr"> 270 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>  <span class="Comment"># b</span>
-<span id="L271" class="LineNr"> 271 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest of buffer is empty</span>
+<span id="L268" class="LineNr"> 268 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># buffer length</span>
+<span id="L269" class="LineNr"> 269 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># a</span>
+<span id="L270" class="LineNr"> 270 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>  <span class="Comment"># b</span>
+<span id="L271" class="LineNr"> 271 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest of buffer is empty</span>
 <span id="L272" class="LineNr"> 272 </span>  ]
 <span id="L273" class="LineNr"> 273 </span>]
 <span id="L274" class="LineNr"> 274 </span>
@@ -339,33 +340,33 @@ if ('onhashchange' in window) {
 <span id="L279" class="LineNr"> 279 </span>  x <span class="Special">&lt;-</span> append x, <span class="Constant">[abc]</span>  <span class="Comment"># buffer is now full</span>
 <span id="L280" class="LineNr"> 280 </span>  s2:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
 <span id="L281" class="LineNr"> 281 </span>  run [
-<span id="L282" class="LineNr"> 282 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal s1, s2
-<span id="L283" class="LineNr"> 283 </span>    11:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
-<span id="L284" class="LineNr"> 284 </span><span class="Constant">    +buffer-filled</span>
-<span id="L285" class="LineNr"> 285 </span>    c:char <span class="Special">&lt;-</span> copy <span class="Constant">100/d</span>
-<span id="L286" class="LineNr"> 286 </span>    x <span class="Special">&lt;-</span> append x, c
-<span id="L287" class="LineNr"> 287 </span>    s3:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
-<span id="L288" class="LineNr"> 288 </span>    20:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal s1, s3
-<span id="L289" class="LineNr"> 289 </span>    21:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *x, <span class="Constant">length:offset</span>
-<span id="L290" class="LineNr"> 290 </span>    30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s3
+<span id="L282" class="LineNr"> 282 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal s1, s2
+<span id="L283" class="LineNr"> 283 </span>  <span class="Conceal">¦</span> 11:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
+<span id="L284" class="LineNr"> 284 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +buffer-filled</span>
+<span id="L285" class="LineNr"> 285 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> copy <span class="Constant">100/d</span>
+<span id="L286" class="LineNr"> 286 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> append x, c
+<span id="L287" class="LineNr"> 287 </span>  <span class="Conceal">¦</span> s3:text <span class="Special">&lt;-</span> get *x, <span class="Constant">data:offset</span>
+<span id="L288" class="LineNr"> 288 </span>  <span class="Conceal">¦</span> 20:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal s1, s3
+<span id="L289" class="LineNr"> 289 </span>  <span class="Conceal">¦</span> 21:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *x, <span class="Constant">length:offset</span>
+<span id="L290" class="LineNr"> 290 </span>  <span class="Conceal">¦</span> 30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s3
 <span id="L291" class="LineNr"> 291 </span>  ]
 <span id="L292" class="LineNr"> 292 </span>  memory-should-contain [
-<span id="L293" class="LineNr"> 293 </span>    <span class="Comment"># before +buffer-filled</span>
-<span id="L294" class="LineNr"> 294 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>   <span class="Comment"># no change in data pointer after original append</span>
-<span id="L295" class="LineNr"> 295 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>   <span class="Comment"># size of data</span>
-<span id="L296" class="LineNr"> 296 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># data</span>
-<span id="L297" class="LineNr"> 297 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>
-<span id="L298" class="LineNr"> 298 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>
-<span id="L299" class="LineNr"> 299 </span>    <span class="Comment"># in the end</span>
-<span id="L300" class="LineNr"> 300 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>   <span class="Comment"># data pointer has grown after second append</span>
-<span id="L301" class="LineNr"> 301 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>   <span class="Comment"># final length</span>
-<span id="L302" class="LineNr"> 302 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>   <span class="Comment"># but data's capacity has doubled</span>
-<span id="L303" class="LineNr"> 303 </span>   <span class="Constant"> 31</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># data</span>
-<span id="L304" class="LineNr"> 304 </span>   <span class="Constant"> 32</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>
-<span id="L305" class="LineNr"> 305 </span>   <span class="Constant"> 33</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>
-<span id="L306" class="LineNr"> 306 </span>   <span class="Constant"> 34</span> <span class="Special">&lt;-</span><span class="Constant"> 100</span>
-<span id="L307" class="LineNr"> 307 </span>   <span class="Constant"> 35</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L308" class="LineNr"> 308 </span>   <span class="Constant"> 36</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L293" class="LineNr"> 293 </span>  <span class="Conceal">¦</span> <span class="Comment"># before +buffer-filled</span>
+<span id="L294" class="LineNr"> 294 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>   <span class="Comment"># no change in data pointer after original append</span>
+<span id="L295" class="LineNr"> 295 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>   <span class="Comment"># size of data</span>
+<span id="L296" class="LineNr"> 296 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># data</span>
+<span id="L297" class="LineNr"> 297 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>
+<span id="L298" class="LineNr"> 298 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>
+<span id="L299" class="LineNr"> 299 </span>  <span class="Conceal">¦</span> <span class="Comment"># in the end</span>
+<span id="L300" class="LineNr"> 300 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>   <span class="Comment"># data pointer has grown after second append</span>
+<span id="L301" class="LineNr"> 301 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>   <span class="Comment"># final length</span>
+<span id="L302" class="LineNr"> 302 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>   <span class="Comment"># but data's capacity has doubled</span>
+<span id="L303" class="LineNr"> 303 </span>  <span class="Conceal">¦</span><span class="Constant"> 31</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># data</span>
+<span id="L304" class="LineNr"> 304 </span>  <span class="Conceal">¦</span><span class="Constant"> 32</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>
+<span id="L305" class="LineNr"> 305 </span>  <span class="Conceal">¦</span><span class="Constant"> 33</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>
+<span id="L306" class="LineNr"> 306 </span>  <span class="Conceal">¦</span><span class="Constant"> 34</span> <span class="Special">&lt;-</span><span class="Constant"> 100</span>
+<span id="L307" class="LineNr"> 307 </span>  <span class="Conceal">¦</span><span class="Constant"> 35</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L308" class="LineNr"> 308 </span>  <span class="Conceal">¦</span><span class="Constant"> 36</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L309" class="LineNr"> 309 </span>  ]
 <span id="L310" class="LineNr"> 310 </span>]
 <span id="L311" class="LineNr"> 311 </span>
@@ -374,15 +375,15 @@ if ('onhashchange' in window) {
 <span id="L314" class="LineNr"> 314 </span>  x:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a>
 <span id="L315" class="LineNr"> 315 </span>  x <span class="Special">&lt;-</span> append x, <span class="Constant">[ab]</span>
 <span id="L316" class="LineNr"> 316 </span>  run [
-<span id="L317" class="LineNr"> 317 </span>    c:char <span class="Special">&lt;-</span> copy <span class="Constant">8/backspace</span>
-<span id="L318" class="LineNr"> 318 </span>    x <span class="Special">&lt;-</span> append x, c
-<span id="L319" class="LineNr"> 319 </span>    s:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> x
-<span id="L320" class="LineNr"> 320 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s
+<span id="L317" class="LineNr"> 317 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> copy <span class="Constant">8/backspace</span>
+<span id="L318" class="LineNr"> 318 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> append x, c
+<span id="L319" class="LineNr"> 319 </span>  <span class="Conceal">¦</span> s:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> x
+<span id="L320" class="LineNr"> 320 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s
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 <span id="L322" class="LineNr"> 322 </span>  memory-should-contain [
-<span id="L323" class="LineNr"> 323 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>   <span class="Comment"># length</span>
-<span id="L324" class="LineNr"> 324 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># contents</span>
-<span id="L325" class="LineNr"> 325 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L323" class="LineNr"> 323 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>   <span class="Comment"># length</span>
+<span id="L324" class="LineNr"> 324 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># contents</span>
+<span id="L325" class="LineNr"> 325 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L326" class="LineNr"> 326 </span>  ]
 <span id="L327" class="LineNr"> 327 </span>]
 <span id="L328" class="LineNr"> 328 </span>
@@ -390,9 +391,9 @@ if ('onhashchange' in window) {
 <span id="L330" class="LineNr"> 330 </span>  <span class="Constant">local-scope</span>
 <span id="L331" class="LineNr"> 331 </span>  <span class="Constant">load-ingredients</span>
 <span id="L332" class="LineNr"> 332 </span>  <span class="Delimiter">{</span>
-<span id="L333" class="LineNr"> 333 </span>    <span class="Comment"># propagate null buffer</span>
-<span id="L334" class="LineNr"> 334 </span>    <span class="muControl">break-if</span> in
-<span id="L335" class="LineNr"> 335 </span>    <span class="muControl">return</span><span class="Constant"> 0</span>
+<span id="L333" class="LineNr"> 333 </span>  <span class="Conceal">¦</span> <span class="Comment"># propagate null buffer</span>
+<span id="L334" class="LineNr"> 334 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> in
+<span id="L335" class="LineNr"> 335 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span><span class="Constant"> 0</span>
 <span id="L336" class="LineNr"> 336 </span>  <span class="Delimiter">}</span>
 <span id="L337" class="LineNr"> 337 </span>  len:num <span class="Special">&lt;-</span> get *in, <span class="Constant">length:offset</span>
 <span id="L338" class="LineNr"> 338 </span>  s:text <span class="Special">&lt;-</span> get *in, <span class="Constant">data:offset</span>
@@ -400,12 +401,12 @@ if ('onhashchange' in window) {
 <span id="L340" class="LineNr"> 340 </span>  result <span class="Special">&lt;-</span> new <span class="Constant">character:type</span>, len
 <span id="L341" class="LineNr"> 341 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L342" class="LineNr"> 342 </span>  <span class="Delimiter">{</span>
-<span id="L343" class="LineNr"> 343 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L344" class="LineNr"> 344 </span>    <span class="muControl">break-if</span> done?
-<span id="L345" class="LineNr"> 345 </span>    src:char <span class="Special">&lt;-</span> index *s, i
-<span id="L346" class="LineNr"> 346 </span>    *result <span class="Special">&lt;-</span> put-index *result, i, src
-<span id="L347" class="LineNr"> 347 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L348" class="LineNr"> 348 </span>    <span class="muControl">loop</span>
+<span id="L343" class="LineNr"> 343 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L344" class="LineNr"> 344 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L345" class="LineNr"> 345 </span>  <span class="Conceal">¦</span> src:char <span class="Special">&lt;-</span> index *s, i
+<span id="L346" class="LineNr"> 346 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, i, src
+<span id="L347" class="LineNr"> 347 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L348" class="LineNr"> 348 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L349" class="LineNr"> 349 </span>  <span class="Delimiter">}</span>
 <span id="L350" class="LineNr"> 350 </span>]
 <span id="L351" class="LineNr"> 351 </span>
@@ -423,16 +424,16 @@ if ('onhashchange' in window) {
 <span id="L363" class="LineNr"> 363 </span>  buf:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a><span class="Constant"> 30</span>
 <span id="L364" class="LineNr"> 364 </span>  <span class="Comment"># append first ingredient</span>
 <span id="L365" class="LineNr"> 365 </span>  <span class="Delimiter">{</span>
-<span id="L366" class="LineNr"> 366 </span>    <span class="muControl">break-unless</span> first
-<span id="L367" class="LineNr"> 367 </span>    buf <span class="Special">&lt;-</span> append buf, first
+<span id="L366" class="LineNr"> 366 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> first
+<span id="L367" class="LineNr"> 367 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, first
 <span id="L368" class="LineNr"> 368 </span>  <span class="Delimiter">}</span>
 <span id="L369" class="LineNr"> 369 </span>  <span class="Comment"># append remaining ingredients</span>
 <span id="L370" class="LineNr"> 370 </span>  <span class="Delimiter">{</span>
-<span id="L371" class="LineNr"> 371 </span>    arg:text, arg-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L372" class="LineNr"> 372 </span>    <span class="muControl">break-unless</span> arg-found?
-<span id="L373" class="LineNr"> 373 </span>    <span class="muControl">loop-unless</span> arg
-<span id="L374" class="LineNr"> 374 </span>    buf <span class="Special">&lt;-</span> append buf, arg
-<span id="L375" class="LineNr"> 375 </span>    <span class="muControl">loop</span>
+<span id="L371" class="LineNr"> 371 </span>  <span class="Conceal">¦</span> arg:text, arg-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L372" class="LineNr"> 372 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> arg-found?
+<span id="L373" class="LineNr"> 373 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> arg
+<span id="L374" class="LineNr"> 374 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, arg
+<span id="L375" class="LineNr"> 375 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L376" class="LineNr"> 376 </span>  <span class="Delimiter">}</span>
 <span id="L377" class="LineNr"> 377 </span>  result <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> buf
 <span id="L378" class="LineNr"> 378 </span>]
@@ -442,11 +443,11 @@ if ('onhashchange' in window) {
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 <span id="L383" class="LineNr"> 383 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[ world!]</span>
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-<span id="L386" class="LineNr"> 386 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L385" class="LineNr"> 385 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> append x, y
+<span id="L386" class="LineNr"> 386 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
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-<span id="L389" class="LineNr"> 389 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello, world!]</span>
+<span id="L389" class="LineNr"> 389 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello, world!]</span>
 <span id="L390" class="LineNr"> 390 </span>  ]
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 <span id="L392" class="LineNr"> 392 </span>
@@ -455,11 +456,11 @@ if ('onhashchange' in window) {
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 <span id="L396" class="LineNr"> 396 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[ world!]</span>
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-<span id="L399" class="LineNr"> 399 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L398" class="LineNr"> 398 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> append x, y
+<span id="L399" class="LineNr"> 399 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
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 <span id="L401" class="LineNr"> 401 </span>  memory-should-contain [
-<span id="L402" class="LineNr"> 402 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[ world!]</span>
+<span id="L402" class="LineNr"> 402 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[ world!]</span>
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 <span id="L405" class="LineNr"> 405 </span>
@@ -468,11 +469,11 @@ if ('onhashchange' in window) {
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 <span id="L409" class="LineNr"> 409 </span>  y:text <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
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-<span id="L412" class="LineNr"> 412 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L411" class="LineNr"> 411 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> append x, y
+<span id="L412" class="LineNr"> 412 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
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 <span id="L414" class="LineNr"> 414 </span>  memory-should-contain [
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+<span id="L415" class="LineNr"> 415 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello,]</span>
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 <span id="L417" class="LineNr"> 417 </span>]
 <span id="L418" class="LineNr"> 418 </span>
@@ -482,11 +483,11 @@ if ('onhashchange' in window) {
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 <span id="L423" class="LineNr"> 423 </span>  z:text <span class="Special">&lt;-</span> new <span class="Constant">[!]</span>
 <span id="L424" class="LineNr"> 424 </span>  run [
-<span id="L425" class="LineNr"> 425 </span>    z:text <span class="Special">&lt;-</span> append x, y, z
-<span id="L426" class="LineNr"> 426 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L425" class="LineNr"> 425 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> append x, y, z
+<span id="L426" class="LineNr"> 426 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
 <span id="L427" class="LineNr"> 427 </span>  ]
 <span id="L428" class="LineNr"> 428 </span>  memory-should-contain [
-<span id="L429" class="LineNr"> 429 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello, world!]</span>
+<span id="L429" class="LineNr"> 429 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello, world!]</span>
 <span id="L430" class="LineNr"> 430 </span>  ]
 <span id="L431" class="LineNr"> 431 </span>]
 <span id="L432" class="LineNr"> 432 </span>
@@ -494,11 +495,11 @@ if ('onhashchange' in window) {
 <span id="L434" class="LineNr"> 434 </span>  <span class="Constant">local-scope</span>
 <span id="L435" class="LineNr"> 435 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L436" class="LineNr"> 436 </span>  run [
-<span id="L437" class="LineNr"> 437 </span>    x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">98/b</span>, <span class="Constant">122/z</span>
-<span id="L438" class="LineNr"> 438 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
+<span id="L437" class="LineNr"> 437 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">98/b</span>, <span class="Constant">122/z</span>
+<span id="L438" class="LineNr"> 438 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
 <span id="L439" class="LineNr"> 439 </span>  ]
 <span id="L440" class="LineNr"> 440 </span>  memory-should-contain [
-<span id="L441" class="LineNr"> 441 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[azc]</span>
+<span id="L441" class="LineNr"> 441 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[azc]</span>
 <span id="L442" class="LineNr"> 442 </span>  ]
 <span id="L443" class="LineNr"> 443 </span>]
 <span id="L444" class="LineNr"> 444 </span>
@@ -518,11 +519,11 @@ if ('onhashchange' in window) {
 <span id="L458" class="LineNr"> 458 </span>  <span class="Constant">local-scope</span>
 <span id="L459" class="LineNr"> 459 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L460" class="LineNr"> 460 </span>  run [
-<span id="L461" class="LineNr"> 461 </span>    x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">97/a</span>, <span class="Constant">122/z</span>
-<span id="L462" class="LineNr"> 462 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
+<span id="L461" class="LineNr"> 461 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">97/a</span>, <span class="Constant">122/z</span>
+<span id="L462" class="LineNr"> 462 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
 <span id="L463" class="LineNr"> 463 </span>  ]
 <span id="L464" class="LineNr"> 464 </span>  memory-should-contain [
-<span id="L465" class="LineNr"> 465 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[zbc]</span>
+<span id="L465" class="LineNr"> 465 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[zbc]</span>
 <span id="L466" class="LineNr"> 466 </span>  ]
 <span id="L467" class="LineNr"> 467 </span>]
 <span id="L468" class="LineNr"> 468 </span>
@@ -530,11 +531,11 @@ if ('onhashchange' in window) {
 <span id="L470" class="LineNr"> 470 </span>  <span class="Constant">local-scope</span>
 <span id="L471" class="LineNr"> 471 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L472" class="LineNr"> 472 </span>  run [
-<span id="L473" class="LineNr"> 473 </span>    x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">99/c</span>, <span class="Constant">122/z</span>
-<span id="L474" class="LineNr"> 474 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
+<span id="L473" class="LineNr"> 473 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">99/c</span>, <span class="Constant">122/z</span>
+<span id="L474" class="LineNr"> 474 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
 <span id="L475" class="LineNr"> 475 </span>  ]
 <span id="L476" class="LineNr"> 476 </span>  memory-should-contain [
-<span id="L477" class="LineNr"> 477 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abz]</span>
+<span id="L477" class="LineNr"> 477 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abz]</span>
 <span id="L478" class="LineNr"> 478 </span>  ]
 <span id="L479" class="LineNr"> 479 </span>]
 <span id="L480" class="LineNr"> 480 </span>
@@ -542,11 +543,11 @@ if ('onhashchange' in window) {
 <span id="L482" class="LineNr"> 482 </span>  <span class="Constant">local-scope</span>
 <span id="L483" class="LineNr"> 483 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L484" class="LineNr"> 484 </span>  run [
-<span id="L485" class="LineNr"> 485 </span>    x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">100/d</span>, <span class="Constant">122/z</span>
-<span id="L486" class="LineNr"> 486 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
+<span id="L485" class="LineNr"> 485 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">100/d</span>, <span class="Constant">122/z</span>
+<span id="L486" class="LineNr"> 486 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
 <span id="L487" class="LineNr"> 487 </span>  ]
 <span id="L488" class="LineNr"> 488 </span>  memory-should-contain [
-<span id="L489" class="LineNr"> 489 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L489" class="LineNr"> 489 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L490" class="LineNr"> 490 </span>  ]
 <span id="L491" class="LineNr"> 491 </span>]
 <span id="L492" class="LineNr"> 492 </span>
@@ -554,11 +555,11 @@ if ('onhashchange' in window) {
 <span id="L494" class="LineNr"> 494 </span>  <span class="Constant">local-scope</span>
 <span id="L495" class="LineNr"> 495 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[banana]</span>
 <span id="L496" class="LineNr"> 496 </span>  run [
-<span id="L497" class="LineNr"> 497 </span>    x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">97/a</span>, <span class="Constant">122/z</span>
-<span id="L498" class="LineNr"> 498 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
+<span id="L497" class="LineNr"> 497 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='061text.mu.html#L445'>replace</a> x, <span class="Constant">97/a</span>, <span class="Constant">122/z</span>
+<span id="L498" class="LineNr"> 498 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
 <span id="L499" class="LineNr"> 499 </span>  ]
 <span id="L500" class="LineNr"> 500 </span>  memory-should-contain [
-<span id="L501" class="LineNr"> 501 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[bznznz]</span>
+<span id="L501" class="LineNr"> 501 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[bznznz]</span>
 <span id="L502" class="LineNr"> 502 </span>  ]
 <span id="L503" class="LineNr"> 503 </span>]
 <span id="L504" class="LineNr"> 504 </span>
@@ -570,14 +571,14 @@ if ('onhashchange' in window) {
 <span id="L510" class="LineNr"> 510 </span>  tem-len:num <span class="Special">&lt;-</span> length *template
 <span id="L511" class="LineNr"> 511 </span>  result-len:num <span class="Special">&lt;-</span> copy tem-len
 <span id="L512" class="LineNr"> 512 </span>  <span class="Delimiter">{</span>
-<span id="L513" class="LineNr"> 513 </span>    <span class="Comment"># while ingredients remain</span>
-<span id="L514" class="LineNr"> 514 </span>    a:text, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L515" class="LineNr"> 515 </span>    <span class="muControl">break-unless</span> arg-received?
-<span id="L516" class="LineNr"> 516 </span>    <span class="Comment"># result-len = result-len + arg.length - 1 (for the 'underscore' being replaced)</span>
-<span id="L517" class="LineNr"> 517 </span>    a-len:num <span class="Special">&lt;-</span> length *a
-<span id="L518" class="LineNr"> 518 </span>    result-len <span class="Special">&lt;-</span> add result-len, a-len
-<span id="L519" class="LineNr"> 519 </span>    result-len <span class="Special">&lt;-</span> subtract result-len,<span class="Constant"> 1</span>
-<span id="L520" class="LineNr"> 520 </span>    <span class="muControl">loop</span>
+<span id="L513" class="LineNr"> 513 </span>  <span class="Conceal">¦</span> <span class="Comment"># while ingredients remain</span>
+<span id="L514" class="LineNr"> 514 </span>  <span class="Conceal">¦</span> a:text, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L515" class="LineNr"> 515 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> arg-received?
+<span id="L516" class="LineNr"> 516 </span>  <span class="Conceal">¦</span> <span class="Comment"># result-len = result-len + arg.length - 1 (for the 'underscore' being replaced)</span>
+<span id="L517" class="LineNr"> 517 </span>  <span class="Conceal">¦</span> a-len:num <span class="Special">&lt;-</span> length *a
+<span id="L518" class="LineNr"> 518 </span>  <span class="Conceal">¦</span> result-len <span class="Special">&lt;-</span> add result-len, a-len
+<span id="L519" class="LineNr"> 519 </span>  <span class="Conceal">¦</span> result-len <span class="Special">&lt;-</span> subtract result-len,<span class="Constant"> 1</span>
+<span id="L520" class="LineNr"> 520 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L521" class="LineNr"> 521 </span>  <span class="Delimiter">}</span>
 <span id="L522" class="LineNr"> 522 </span>  <span class="Constant">rewind-ingredients</span>
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@@ -586,53 +587,53 @@ if ('onhashchange' in window) {
 <span id="L526" class="LineNr"> 526 </span>  result-idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L527" class="LineNr"> 527 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L528" class="LineNr"> 528 </span>  <span class="Delimiter">{</span>
-<span id="L529" class="LineNr"> 529 </span>    <span class="Comment"># while arg received</span>
-<span id="L530" class="LineNr"> 530 </span>    a:text, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L531" class="LineNr"> 531 </span>    <span class="muControl">break-unless</span> arg-received?
-<span id="L532" class="LineNr"> 532 </span>    <span class="Comment"># copy template into result until '_'</span>
-<span id="L533" class="LineNr"> 533 </span>    <span class="Delimiter">{</span>
-<span id="L534" class="LineNr"> 534 </span>      <span class="Comment"># while i &lt; template.length</span>
-<span id="L535" class="LineNr"> 535 </span>      tem-done?:bool <span class="Special">&lt;-</span> greater-or-equal i, tem-len
-<span id="L536" class="LineNr"> 536 </span>      <span class="muControl">break-if</span> tem-done?, <span class="Constant">+done</span>
-<span id="L537" class="LineNr"> 537 </span>      <span class="Comment"># while template[i] != '_'</span>
-<span id="L538" class="LineNr"> 538 </span>      in:char <span class="Special">&lt;-</span> index *template, i
-<span id="L539" class="LineNr"> 539 </span>      underscore?:bool <span class="Special">&lt;-</span> equal in, <span class="Constant">95/_</span>
-<span id="L540" class="LineNr"> 540 </span>      <span class="muControl">break-if</span> underscore?
-<span id="L541" class="LineNr"> 541 </span>      <span class="Comment"># result[result-idx] = template[i]</span>
-<span id="L542" class="LineNr"> 542 </span>      *result <span class="Special">&lt;-</span> put-index *result, result-idx, in
-<span id="L543" class="LineNr"> 543 </span>      i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L544" class="LineNr"> 544 </span>      result-idx <span class="Special">&lt;-</span> add result-idx,<span class="Constant"> 1</span>
-<span id="L545" class="LineNr"> 545 </span>      <span class="muControl">loop</span>
-<span id="L546" class="LineNr"> 546 </span>    <span class="Delimiter">}</span>
-<span id="L547" class="LineNr"> 547 </span>    <span class="Comment"># copy 'a' into result</span>
-<span id="L548" class="LineNr"> 548 </span>    j:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
-<span id="L549" class="LineNr"> 549 </span>    <span class="Delimiter">{</span>
-<span id="L550" class="LineNr"> 550 </span>      <span class="Comment"># while j &lt; a.length</span>
-<span id="L551" class="LineNr"> 551 </span>      arg-done?:bool <span class="Special">&lt;-</span> greater-or-equal j, a-len
-<span id="L552" class="LineNr"> 552 </span>      <span class="muControl">break-if</span> arg-done?
-<span id="L553" class="LineNr"> 553 </span>      <span class="Comment"># result[result-idx] = a[j]</span>
-<span id="L554" class="LineNr"> 554 </span>      in:char <span class="Special">&lt;-</span> index *a, j
-<span id="L555" class="LineNr"> 555 </span>      *result <span class="Special">&lt;-</span> put-index *result, result-idx, in
-<span id="L556" class="LineNr"> 556 </span>      j <span class="Special">&lt;-</span> add j,<span class="Constant"> 1</span>
-<span id="L557" class="LineNr"> 557 </span>      result-idx <span class="Special">&lt;-</span> add result-idx,<span class="Constant"> 1</span>
-<span id="L558" class="LineNr"> 558 </span>      <span class="muControl">loop</span>
-<span id="L559" class="LineNr"> 559 </span>    <span class="Delimiter">}</span>
-<span id="L560" class="LineNr"> 560 </span>    <span class="Comment"># skip '_' in template</span>
-<span id="L561" class="LineNr"> 561 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L562" class="LineNr"> 562 </span>    <span class="muControl">loop</span>  <span class="Comment"># interpolate next arg</span>
+<span id="L529" class="LineNr"> 529 </span>  <span class="Conceal">¦</span> <span class="Comment"># while arg received</span>
+<span id="L530" class="LineNr"> 530 </span>  <span class="Conceal">¦</span> a:text, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L531" class="LineNr"> 531 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> arg-received?
+<span id="L532" class="LineNr"> 532 </span>  <span class="Conceal">¦</span> <span class="Comment"># copy template into result until '_'</span>
+<span id="L533" class="LineNr"> 533 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L534" class="LineNr"> 534 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># while i &lt; template.length</span>
+<span id="L535" class="LineNr"> 535 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tem-done?:bool <span class="Special">&lt;-</span> greater-or-equal i, tem-len
+<span id="L536" class="LineNr"> 536 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> tem-done?, <span class="Constant">+done</span>
+<span id="L537" class="LineNr"> 537 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># while template[i] != '_'</span>
+<span id="L538" class="LineNr"> 538 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> in:char <span class="Special">&lt;-</span> index *template, i
+<span id="L539" class="LineNr"> 539 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> underscore?:bool <span class="Special">&lt;-</span> equal in, <span class="Constant">95/_</span>
+<span id="L540" class="LineNr"> 540 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> underscore?
+<span id="L541" class="LineNr"> 541 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># result[result-idx] = template[i]</span>
+<span id="L542" class="LineNr"> 542 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, result-idx, in
+<span id="L543" class="LineNr"> 543 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L544" class="LineNr"> 544 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result-idx <span class="Special">&lt;-</span> add result-idx,<span class="Constant"> 1</span>
+<span id="L545" class="LineNr"> 545 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L546" class="LineNr"> 546 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L547" class="LineNr"> 547 </span>  <span class="Conceal">¦</span> <span class="Comment"># copy 'a' into result</span>
+<span id="L548" class="LineNr"> 548 </span>  <span class="Conceal">¦</span> j:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L549" class="LineNr"> 549 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L550" class="LineNr"> 550 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># while j &lt; a.length</span>
+<span id="L551" class="LineNr"> 551 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> arg-done?:bool <span class="Special">&lt;-</span> greater-or-equal j, a-len
+<span id="L552" class="LineNr"> 552 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> arg-done?
+<span id="L553" class="LineNr"> 553 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># result[result-idx] = a[j]</span>
+<span id="L554" class="LineNr"> 554 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> in:char <span class="Special">&lt;-</span> index *a, j
+<span id="L555" class="LineNr"> 555 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, result-idx, in
+<span id="L556" class="LineNr"> 556 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> j <span class="Special">&lt;-</span> add j,<span class="Constant"> 1</span>
+<span id="L557" class="LineNr"> 557 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result-idx <span class="Special">&lt;-</span> add result-idx,<span class="Constant"> 1</span>
+<span id="L558" class="LineNr"> 558 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L559" class="LineNr"> 559 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L560" class="LineNr"> 560 </span>  <span class="Conceal">¦</span> <span class="Comment"># skip '_' in template</span>
+<span id="L561" class="LineNr"> 561 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L562" class="LineNr"> 562 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>  <span class="Comment"># interpolate next arg</span>
 <span id="L563" class="LineNr"> 563 </span>  <span class="Delimiter">}</span>
 <span id="L564" class="LineNr"> 564 </span><span class="Constant">  +done</span>
 <span id="L565" class="LineNr"> 565 </span>  <span class="Comment"># done with holes; copy rest of template directly into result</span>
 <span id="L566" class="LineNr"> 566 </span>  <span class="Delimiter">{</span>
-<span id="L567" class="LineNr"> 567 </span>    <span class="Comment"># while i &lt; template.length</span>
-<span id="L568" class="LineNr"> 568 </span>    tem-done?:bool <span class="Special">&lt;-</span> greater-or-equal i, tem-len
-<span id="L569" class="LineNr"> 569 </span>    <span class="muControl">break-if</span> tem-done?
-<span id="L570" class="LineNr"> 570 </span>    <span class="Comment"># result[result-idx] = template[i]</span>
-<span id="L571" class="LineNr"> 571 </span>    in:char <span class="Special">&lt;-</span> index *template, i
-<span id="L572" class="LineNr"> 572 </span>    *result <span class="Special">&lt;-</span> put-index *result, result-idx, in
-<span id="L573" class="LineNr"> 573 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L574" class="LineNr"> 574 </span>    result-idx <span class="Special">&lt;-</span> add result-idx,<span class="Constant"> 1</span>
-<span id="L575" class="LineNr"> 575 </span>    <span class="muControl">loop</span>
+<span id="L567" class="LineNr"> 567 </span>  <span class="Conceal">¦</span> <span class="Comment"># while i &lt; template.length</span>
+<span id="L568" class="LineNr"> 568 </span>  <span class="Conceal">¦</span> tem-done?:bool <span class="Special">&lt;-</span> greater-or-equal i, tem-len
+<span id="L569" class="LineNr"> 569 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> tem-done?
+<span id="L570" class="LineNr"> 570 </span>  <span class="Conceal">¦</span> <span class="Comment"># result[result-idx] = template[i]</span>
+<span id="L571" class="LineNr"> 571 </span>  <span class="Conceal">¦</span> in:char <span class="Special">&lt;-</span> index *template, i
+<span id="L572" class="LineNr"> 572 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, result-idx, in
+<span id="L573" class="LineNr"> 573 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L574" class="LineNr"> 574 </span>  <span class="Conceal">¦</span> result-idx <span class="Special">&lt;-</span> add result-idx,<span class="Constant"> 1</span>
+<span id="L575" class="LineNr"> 575 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L576" class="LineNr"> 576 </span>  <span class="Delimiter">}</span>
 <span id="L577" class="LineNr"> 577 </span>]
 <span id="L578" class="LineNr"> 578 </span>
@@ -641,11 +642,11 @@ if ('onhashchange' in window) {
 <span id="L581" class="LineNr"> 581 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc_ghi]</span>
 <span id="L582" class="LineNr"> 582 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[def]</span>
 <span id="L583" class="LineNr"> 583 </span>  run [
-<span id="L584" class="LineNr"> 584 </span>    z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L506'>interpolate</a> x, y
-<span id="L585" class="LineNr"> 585 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L584" class="LineNr"> 584 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L506'>interpolate</a> x, y
+<span id="L585" class="LineNr"> 585 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
 <span id="L586" class="LineNr"> 586 </span>  ]
 <span id="L587" class="LineNr"> 587 </span>  memory-should-contain [
-<span id="L588" class="LineNr"> 588 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abcdefghi]</span>
+<span id="L588" class="LineNr"> 588 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abcdefghi]</span>
 <span id="L589" class="LineNr"> 589 </span>  ]
 <span id="L590" class="LineNr"> 590 </span>]
 <span id="L591" class="LineNr"> 591 </span>
@@ -654,12 +655,12 @@ if ('onhashchange' in window) {
 <span id="L594" class="LineNr"> 594 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[_, hello!]</span>
 <span id="L595" class="LineNr"> 595 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L596" class="LineNr"> 596 </span>  run [
-<span id="L597" class="LineNr"> 597 </span>    z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L506'>interpolate</a> x, y
-<span id="L598" class="LineNr"> 598 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L597" class="LineNr"> 597 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L506'>interpolate</a> x, y
+<span id="L598" class="LineNr"> 598 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
 <span id="L599" class="LineNr"> 599 </span>  ]
 <span id="L600" class="LineNr"> 600 </span>  memory-should-contain [
-<span id="L601" class="LineNr"> 601 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc, hello!]</span>
-<span id="L602" class="LineNr"> 602 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># out of bounds</span>
+<span id="L601" class="LineNr"> 601 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc, hello!]</span>
+<span id="L602" class="LineNr"> 602 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># out of bounds</span>
 <span id="L603" class="LineNr"> 603 </span>  ]
 <span id="L604" class="LineNr"> 604 </span>]
 <span id="L605" class="LineNr"> 605 </span>
@@ -668,11 +669,11 @@ if ('onhashchange' in window) {
 <span id="L608" class="LineNr"> 608 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[hello, _]</span>
 <span id="L609" class="LineNr"> 609 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L610" class="LineNr"> 610 </span>  run [
-<span id="L611" class="LineNr"> 611 </span>    z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L506'>interpolate</a> x, y
-<span id="L612" class="LineNr"> 612 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L611" class="LineNr"> 611 </span>  <span class="Conceal">¦</span> z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L506'>interpolate</a> x, y
+<span id="L612" class="LineNr"> 612 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
 <span id="L613" class="LineNr"> 613 </span>  ]
 <span id="L614" class="LineNr"> 614 </span>  memory-should-contain [
-<span id="L615" class="LineNr"> 615 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello, abc]</span>
+<span id="L615" class="LineNr"> 615 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[hello, abc]</span>
 <span id="L616" class="LineNr"> 616 </span>  ]
 <span id="L617" class="LineNr"> 617 </span>]
 <span id="L618" class="LineNr"> 618 </span>
@@ -745,28 +746,28 @@ if ('onhashchange' in window) {
 <span id="L685" class="LineNr"> 685 </span>  <span class="Comment"># left trim: compute start</span>
 <span id="L686" class="LineNr"> 686 </span>  start:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L687" class="LineNr"> 687 </span>  <span class="Delimiter">{</span>
-<span id="L688" class="LineNr"> 688 </span>    <span class="Delimiter">{</span>
-<span id="L689" class="LineNr"> 689 </span>      at-end?:bool <span class="Special">&lt;-</span> greater-or-equal start, len
-<span id="L690" class="LineNr"> 690 </span>      <span class="muControl">break-unless</span> at-end?
-<span id="L691" class="LineNr"> 691 </span>      result <span class="Special">&lt;-</span> new <span class="Constant">character:type</span>,<span class="Constant"> 0</span>
-<span id="L692" class="LineNr"> 692 </span>      <span class="muControl">return</span>
-<span id="L693" class="LineNr"> 693 </span>    <span class="Delimiter">}</span>
-<span id="L694" class="LineNr"> 694 </span>    curr:char <span class="Special">&lt;-</span> index *s, start
-<span id="L695" class="LineNr"> 695 </span>    whitespace?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> curr
-<span id="L696" class="LineNr"> 696 </span>    <span class="muControl">break-unless</span> whitespace?
-<span id="L697" class="LineNr"> 697 </span>    start <span class="Special">&lt;-</span> add start,<span class="Constant"> 1</span>
-<span id="L698" class="LineNr"> 698 </span>    <span class="muControl">loop</span>
+<span id="L688" class="LineNr"> 688 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L689" class="LineNr"> 689 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-end?:bool <span class="Special">&lt;-</span> greater-or-equal start, len
+<span id="L690" class="LineNr"> 690 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L691" class="LineNr"> 691 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> new <span class="Constant">character:type</span>,<span class="Constant"> 0</span>
+<span id="L692" class="LineNr"> 692 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">return</span>
+<span id="L693" class="LineNr"> 693 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L694" class="LineNr"> 694 </span>  <span class="Conceal">¦</span> curr:char <span class="Special">&lt;-</span> index *s, start
+<span id="L695" class="LineNr"> 695 </span>  <span class="Conceal">¦</span> whitespace?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> curr
+<span id="L696" class="LineNr"> 696 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> whitespace?
+<span id="L697" class="LineNr"> 697 </span>  <span class="Conceal">¦</span> start <span class="Special">&lt;-</span> add start,<span class="Constant"> 1</span>
+<span id="L698" class="LineNr"> 698 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L699" class="LineNr"> 699 </span>  <span class="Delimiter">}</span>
 <span id="L700" class="LineNr"> 700 </span>  <span class="Comment"># right trim: compute end</span>
 <span id="L701" class="LineNr"> 701 </span>  end:num <span class="Special">&lt;-</span> subtract len,<span class="Constant"> 1</span>
 <span id="L702" class="LineNr"> 702 </span>  <span class="Delimiter">{</span>
-<span id="L703" class="LineNr"> 703 </span>    not-at-start?:bool <span class="Special">&lt;-</span> greater-than end, start
-<span id="L704" class="LineNr"> 704 </span>    assert not-at-start?, <span class="Constant">[end ran up against start]</span>
-<span id="L705" class="LineNr"> 705 </span>    curr:char <span class="Special">&lt;-</span> index *s, end
-<span id="L706" class="LineNr"> 706 </span>    whitespace?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> curr
-<span id="L707" class="LineNr"> 707 </span>    <span class="muControl">break-unless</span> whitespace?
-<span id="L708" class="LineNr"> 708 </span>    end <span class="Special">&lt;-</span> subtract end,<span class="Constant"> 1</span>
-<span id="L709" class="LineNr"> 709 </span>    <span class="muControl">loop</span>
+<span id="L703" class="LineNr"> 703 </span>  <span class="Conceal">¦</span> not-at-start?:bool <span class="Special">&lt;-</span> greater-than end, start
+<span id="L704" class="LineNr"> 704 </span>  <span class="Conceal">¦</span> assert not-at-start?, <span class="Constant">[end ran up against start]</span>
+<span id="L705" class="LineNr"> 705 </span>  <span class="Conceal">¦</span> curr:char <span class="Special">&lt;-</span> index *s, end
+<span id="L706" class="LineNr"> 706 </span>  <span class="Conceal">¦</span> whitespace?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> curr
+<span id="L707" class="LineNr"> 707 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> whitespace?
+<span id="L708" class="LineNr"> 708 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> subtract end,<span class="Constant"> 1</span>
+<span id="L709" class="LineNr"> 709 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L710" class="LineNr"> 710 </span>  <span class="Delimiter">}</span>
 <span id="L711" class="LineNr"> 711 </span>  <span class="Comment"># result = new character[end+1 - start]</span>
 <span id="L712" class="LineNr"> 712 </span>  new-len:num <span class="Special">&lt;-</span> subtract end, start,<span class="Constant"> -1</span>
@@ -775,15 +776,15 @@ if ('onhashchange' in window) {
 <span id="L715" class="LineNr"> 715 </span>  i:num <span class="Special">&lt;-</span> copy start
 <span id="L716" class="LineNr"> 716 </span>  j:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L717" class="LineNr"> 717 </span>  <span class="Delimiter">{</span>
-<span id="L718" class="LineNr"> 718 </span>    <span class="Comment"># while i &lt;= end</span>
-<span id="L719" class="LineNr"> 719 </span>    done?:bool <span class="Special">&lt;-</span> greater-than i, end
-<span id="L720" class="LineNr"> 720 </span>    <span class="muControl">break-if</span> done?
-<span id="L721" class="LineNr"> 721 </span>    <span class="Comment"># result[j] = s[i]</span>
-<span id="L722" class="LineNr"> 722 </span>    src:char <span class="Special">&lt;-</span> index *s, i
-<span id="L723" class="LineNr"> 723 </span>    *result <span class="Special">&lt;-</span> put-index *result, j, src
-<span id="L724" class="LineNr"> 724 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L725" class="LineNr"> 725 </span>    j <span class="Special">&lt;-</span> add j,<span class="Constant"> 1</span>
-<span id="L726" class="LineNr"> 726 </span>    <span class="muControl">loop</span>
+<span id="L718" class="LineNr"> 718 </span>  <span class="Conceal">¦</span> <span class="Comment"># while i &lt;= end</span>
+<span id="L719" class="LineNr"> 719 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-than i, end
+<span id="L720" class="LineNr"> 720 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L721" class="LineNr"> 721 </span>  <span class="Conceal">¦</span> <span class="Comment"># result[j] = s[i]</span>
+<span id="L722" class="LineNr"> 722 </span>  <span class="Conceal">¦</span> src:char <span class="Special">&lt;-</span> index *s, i
+<span id="L723" class="LineNr"> 723 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, j, src
+<span id="L724" class="LineNr"> 724 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L725" class="LineNr"> 725 </span>  <span class="Conceal">¦</span> j <span class="Special">&lt;-</span> add j,<span class="Constant"> 1</span>
+<span id="L726" class="LineNr"> 726 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L727" class="LineNr"> 727 </span>  <span class="Delimiter">}</span>
 <span id="L728" class="LineNr"> 728 </span>]
 <span id="L729" class="LineNr"> 729 </span>
@@ -791,11 +792,11 @@ if ('onhashchange' in window) {
 <span id="L731" class="LineNr"> 731 </span>  <span class="Constant">local-scope</span>
 <span id="L732" class="LineNr"> 732 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L733" class="LineNr"> 733 </span>  run [
-<span id="L734" class="LineNr"> 734 </span>    y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L681'>trim</a> x
-<span id="L735" class="LineNr"> 735 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L734" class="LineNr"> 734 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L681'>trim</a> x
+<span id="L735" class="LineNr"> 735 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
 <span id="L736" class="LineNr"> 736 </span>  ]
 <span id="L737" class="LineNr"> 737 </span>  memory-should-contain [
-<span id="L738" class="LineNr"> 738 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L738" class="LineNr"> 738 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L739" class="LineNr"> 739 </span>  ]
 <span id="L740" class="LineNr"> 740 </span>]
 <span id="L741" class="LineNr"> 741 </span>
@@ -803,11 +804,11 @@ if ('onhashchange' in window) {
 <span id="L743" class="LineNr"> 743 </span>  <span class="Constant">local-scope</span>
 <span id="L744" class="LineNr"> 744 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[  abc]</span>
 <span id="L745" class="LineNr"> 745 </span>  run [
-<span id="L746" class="LineNr"> 746 </span>    y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L681'>trim</a> x
-<span id="L747" class="LineNr"> 747 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L746" class="LineNr"> 746 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L681'>trim</a> x
+<span id="L747" class="LineNr"> 747 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
 <span id="L748" class="LineNr"> 748 </span>  ]
 <span id="L749" class="LineNr"> 749 </span>  memory-should-contain [
-<span id="L750" class="LineNr"> 750 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L750" class="LineNr"> 750 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L751" class="LineNr"> 751 </span>  ]
 <span id="L752" class="LineNr"> 752 </span>]
 <span id="L753" class="LineNr"> 753 </span>
@@ -815,11 +816,11 @@ if ('onhashchange' in window) {
 <span id="L755" class="LineNr"> 755 </span>  <span class="Constant">local-scope</span>
 <span id="L756" class="LineNr"> 756 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc  ]</span>
 <span id="L757" class="LineNr"> 757 </span>  run [
-<span id="L758" class="LineNr"> 758 </span>    y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L681'>trim</a> x
-<span id="L759" class="LineNr"> 759 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L758" class="LineNr"> 758 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L681'>trim</a> x
+<span id="L759" class="LineNr"> 759 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
 <span id="L760" class="LineNr"> 760 </span>  ]
 <span id="L761" class="LineNr"> 761 </span>  memory-should-contain [
-<span id="L762" class="LineNr"> 762 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L762" class="LineNr"> 762 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L763" class="LineNr"> 763 </span>  ]
 <span id="L764" class="LineNr"> 764 </span>]
 <span id="L765" class="LineNr"> 765 </span>
@@ -827,11 +828,11 @@ if ('onhashchange' in window) {
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@@ -934,10 +935,10 @@ if ('onhashchange' in window) {
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+<span id="L877" class="LineNr"> 877 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> find-next x, <span class="Constant">47/slash</span>, <span class="Constant">0/start-index</span>
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 <span id="L883" class="LineNr"> 883 </span>
@@ -945,10 +946,10 @@ if ('onhashchange' in window) {
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+<span id="L888" class="LineNr"> 888 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> find-next x, <span class="Constant">47/slash</span>, <span class="Constant">3/start-index</span>
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@@ -961,15 +962,15 @@ if ('onhashchange' in window) {
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+<span id="L909" class="LineNr"> 909 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L910" class="LineNr"> 910 </span>  <span class="Conceal">¦</span> <span class="Comment"># optimization: skip past indices that definitely won't match</span>
+<span id="L911" class="LineNr"> 911 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> find-next text, first, idx
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 <span id="L928" class="LineNr"> 928 </span>
@@ -991,10 +992,10 @@ if ('onhashchange' in window) {
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 <span id="L932" class="LineNr"> 932 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[bc]</span>
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+<span id="L937" class="LineNr"> 937 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
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 <span id="L940" class="LineNr"> 940 </span>
@@ -1003,10 +1004,10 @@ if ('onhashchange' in window) {
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 <span id="L950" class="LineNr"> 950 </span>  ]
 <span id="L951" class="LineNr"> 951 </span>]
 <span id="L952" class="LineNr"> 952 </span>
@@ -1015,10 +1016,10 @@ if ('onhashchange' in window) {
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 <span id="L956" class="LineNr"> 956 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[cd]</span>
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 <span id="L964" class="LineNr"> 964 </span>
@@ -1027,10 +1028,10 @@ if ('onhashchange' in window) {
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 <span id="L968" class="LineNr"> 968 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[cde]</span>
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+<span id="L973" class="LineNr"> 973 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># not found</span>
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 <span id="L976" class="LineNr"> 976 </span>
@@ -1041,27 +1042,27 @@ if ('onhashchange' in window) {
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 <span id="L982" class="LineNr"> 982 </span>  <span class="Comment"># check that there's space left for the pattern</span>
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+<span id="L984" class="LineNr"> 984 </span>  <span class="Conceal">¦</span> x:num <span class="Special">&lt;-</span> length *text
+<span id="L985" class="LineNr"> 985 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> subtract x, pattern-len
+<span id="L986" class="LineNr"> 986 </span>  <span class="Conceal">¦</span> enough-room?:bool <span class="Special">&lt;-</span> lesser-or-equal idx, x
+<span id="L987" class="LineNr"> 987 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> enough-room?
+<span id="L988" class="LineNr"> 988 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/not-found</span>
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-<span id="L999" class="LineNr"> 999 </span>      <span class="muControl">break-if</span> match?
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-<span id="L1001" class="LineNr">1001 </span>    <span class="Delimiter">}</span>
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+<span id="L994" class="LineNr"> 994 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L995" class="LineNr"> 995 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *text, idx
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+<span id="L999" class="LineNr"> 999 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> match?
+<span id="L1000" class="LineNr">1000 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/not-found</span>
+<span id="L1001" class="LineNr">1001 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L1002" class="LineNr">1002 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L1003" class="LineNr">1003 </span>  <span class="Conceal">¦</span> pattern-idx <span class="Special">&lt;-</span> add pattern-idx,<span class="Constant"> 1</span>
+<span id="L1004" class="LineNr">1004 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
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@@ -1071,10 +1072,10 @@ if ('onhashchange' in window) {
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+<span id="L1014" class="LineNr">1014 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 0</span>
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+<span id="L1017" class="LineNr">1017 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># match found</span>
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 <span id="L1020" class="LineNr">1020 </span>
@@ -1082,10 +1083,10 @@ if ('onhashchange' in window) {
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 <span id="L1023" class="LineNr">1023 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
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+<span id="L1025" class="LineNr">1025 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, x,<span class="Constant"> 0</span>
 <span id="L1026" class="LineNr">1026 </span>  ]
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+<span id="L1028" class="LineNr">1028 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># match found</span>
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 <span id="L1031" class="LineNr">1031 </span>
@@ -1094,10 +1095,10 @@ if ('onhashchange' in window) {
 <span id="L1034" class="LineNr">1034 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1035" class="LineNr">1035 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[a]</span>
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+<span id="L1037" class="LineNr">1037 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 4</span>
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+<span id="L1040" class="LineNr">1040 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># never matches</span>
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 <span id="L1043" class="LineNr">1043 </span>
@@ -1106,10 +1107,10 @@ if ('onhashchange' in window) {
 <span id="L1046" class="LineNr">1046 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
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+<span id="L1049" class="LineNr">1049 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 0</span>
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 <span id="L1053" class="LineNr">1053 </span>  ]
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 <span id="L1055" class="LineNr">1055 </span>
@@ -1118,10 +1119,10 @@ if ('onhashchange' in window) {
 <span id="L1058" class="LineNr">1058 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1059" class="LineNr">1059 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
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+<span id="L1061" class="LineNr">1061 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 4</span>
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+<span id="L1064" class="LineNr">1064 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no match</span>
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 <span id="L1067" class="LineNr">1067 </span>
@@ -1130,10 +1131,10 @@ if ('onhashchange' in window) {
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 <span id="L1071" class="LineNr">1071 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
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+<span id="L1073" class="LineNr">1073 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 0</span>
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+<span id="L1076" class="LineNr">1076 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no match</span>
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 <span id="L1079" class="LineNr">1079 </span>
@@ -1141,10 +1142,10 @@ if ('onhashchange' in window) {
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 <span id="L1082" class="LineNr">1082 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
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+<span id="L1084" class="LineNr">1084 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, x,<span class="Constant"> 0</span>
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 <span id="L1086" class="LineNr">1086 </span>  memory-should-contain [
-<span id="L1087" class="LineNr">1087 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># matches because pattern is also empty</span>
+<span id="L1087" class="LineNr">1087 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># matches because pattern is also empty</span>
 <span id="L1088" class="LineNr">1088 </span>  ]
 <span id="L1089" class="LineNr">1089 </span>]
 <span id="L1090" class="LineNr">1090 </span>
@@ -1153,10 +1154,10 @@ if ('onhashchange' in window) {
 <span id="L1093" class="LineNr">1093 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1094" class="LineNr">1094 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[bc]</span>
 <span id="L1095" class="LineNr">1095 </span>  run [
-<span id="L1096" class="LineNr">1096 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 1</span>
+<span id="L1096" class="LineNr">1096 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 1</span>
 <span id="L1097" class="LineNr">1097 </span>  ]
 <span id="L1098" class="LineNr">1098 </span>  memory-should-contain [
-<span id="L1099" class="LineNr">1099 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># match</span>
+<span id="L1099" class="LineNr">1099 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># match</span>
 <span id="L1100" class="LineNr">1100 </span>  ]
 <span id="L1101" class="LineNr">1101 </span>]
 <span id="L1102" class="LineNr">1102 </span>
@@ -1165,10 +1166,10 @@ if ('onhashchange' in window) {
 <span id="L1105" class="LineNr">1105 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1106" class="LineNr">1106 </span>  y:text <span class="Special">&lt;-</span> new <span class="Constant">[bc]</span>
 <span id="L1107" class="LineNr">1107 </span>  run [
-<span id="L1108" class="LineNr">1108 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 0</span>
+<span id="L1108" class="LineNr">1108 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L978'>match-at</a> x, y,<span class="Constant"> 0</span>
 <span id="L1109" class="LineNr">1109 </span>  ]
 <span id="L1110" class="LineNr">1110 </span>  memory-should-contain [
-<span id="L1111" class="LineNr">1111 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no match</span>
+<span id="L1111" class="LineNr">1111 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no match</span>
 <span id="L1112" class="LineNr">1112 </span>  ]
 <span id="L1113" class="LineNr">1113 </span>]
 <span id="L1114" class="LineNr">1114 </span>
@@ -1178,21 +1179,21 @@ if ('onhashchange' in window) {
 <span id="L1118" class="LineNr">1118 </span>  <span class="Comment"># empty text? return empty array</span>
 <span id="L1119" class="LineNr">1119 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L1120" class="LineNr">1120 </span>  <span class="Delimiter">{</span>
-<span id="L1121" class="LineNr">1121 </span>    empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
-<span id="L1122" class="LineNr">1122 </span>    <span class="muControl">break-unless</span> empty?
-<span id="L1123" class="LineNr">1123 </span>    result <span class="Special">&lt;-</span> new <span class="Delimiter">{</span>(address array character): type<span class="Delimiter">}</span>,<span class="Constant"> 0</span>
-<span id="L1124" class="LineNr">1124 </span>    <span class="muControl">return</span>
+<span id="L1121" class="LineNr">1121 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
+<span id="L1122" class="LineNr">1122 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> empty?
+<span id="L1123" class="LineNr">1123 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> new <span class="Delimiter">{</span>(address array character): type<span class="Delimiter">}</span>,<span class="Constant"> 0</span>
+<span id="L1124" class="LineNr">1124 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L1125" class="LineNr">1125 </span>  <span class="Delimiter">}</span>
 <span id="L1126" class="LineNr">1126 </span>  <span class="Comment"># count #pieces we need room for</span>
 <span id="L1127" class="LineNr">1127 </span>  count:num <span class="Special">&lt;-</span> copy<span class="Constant"> 1</span>  <span class="Comment"># n delimiters = n+1 pieces</span>
 <span id="L1128" class="LineNr">1128 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L1129" class="LineNr">1129 </span>  <span class="Delimiter">{</span>
-<span id="L1130" class="LineNr">1130 </span>    idx <span class="Special">&lt;-</span> find-next s, delim, idx
-<span id="L1131" class="LineNr">1131 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal idx, len
-<span id="L1132" class="LineNr">1132 </span>    <span class="muControl">break-if</span> done?
-<span id="L1133" class="LineNr">1133 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
-<span id="L1134" class="LineNr">1134 </span>    count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
-<span id="L1135" class="LineNr">1135 </span>    <span class="muControl">loop</span>
+<span id="L1130" class="LineNr">1130 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> find-next s, delim, idx
+<span id="L1131" class="LineNr">1131 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal idx, len
+<span id="L1132" class="LineNr">1132 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L1133" class="LineNr">1133 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L1134" class="LineNr">1134 </span>  <span class="Conceal">¦</span> count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
+<span id="L1135" class="LineNr">1135 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1136" class="LineNr">1136 </span>  <span class="Delimiter">}</span>
 <span id="L1137" class="LineNr">1137 </span>  <span class="Comment"># allocate space</span>
 <span id="L1138" class="LineNr">1138 </span>  result <span class="Special">&lt;-</span> new <span class="Delimiter">{</span>(address array character): type<span class="Delimiter">}</span>, count
@@ -1200,17 +1201,17 @@ if ('onhashchange' in window) {
 <span id="L1140" class="LineNr">1140 </span>  curr-result:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L1141" class="LineNr">1141 </span>  start:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L1142" class="LineNr">1142 </span>  <span class="Delimiter">{</span>
-<span id="L1143" class="LineNr">1143 </span>    <span class="Comment"># while next delim exists</span>
-<span id="L1144" class="LineNr">1144 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal start, len
-<span id="L1145" class="LineNr">1145 </span>    <span class="muControl">break-if</span> done?
-<span id="L1146" class="LineNr">1146 </span>    end:num <span class="Special">&lt;-</span> find-next s, delim, start
-<span id="L1147" class="LineNr">1147 </span>    <span class="Comment"># copy start..end into result[curr-result]</span>
-<span id="L1148" class="LineNr">1148 </span>    dest:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> s, start, end
-<span id="L1149" class="LineNr">1149 </span>    *result <span class="Special">&lt;-</span> put-index *result, curr-result, dest
-<span id="L1150" class="LineNr">1150 </span>    <span class="Comment"># slide over to next slice</span>
-<span id="L1151" class="LineNr">1151 </span>    start <span class="Special">&lt;-</span> add end,<span class="Constant"> 1</span>
-<span id="L1152" class="LineNr">1152 </span>    curr-result <span class="Special">&lt;-</span> add curr-result,<span class="Constant"> 1</span>
-<span id="L1153" class="LineNr">1153 </span>    <span class="muControl">loop</span>
+<span id="L1143" class="LineNr">1143 </span>  <span class="Conceal">¦</span> <span class="Comment"># while next delim exists</span>
+<span id="L1144" class="LineNr">1144 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal start, len
+<span id="L1145" class="LineNr">1145 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L1146" class="LineNr">1146 </span>  <span class="Conceal">¦</span> end:num <span class="Special">&lt;-</span> find-next s, delim, start
+<span id="L1147" class="LineNr">1147 </span>  <span class="Conceal">¦</span> <span class="Comment"># copy start..end into result[curr-result]</span>
+<span id="L1148" class="LineNr">1148 </span>  <span class="Conceal">¦</span> dest:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> s, start, end
+<span id="L1149" class="LineNr">1149 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, curr-result, dest
+<span id="L1150" class="LineNr">1150 </span>  <span class="Conceal">¦</span> <span class="Comment"># slide over to next slice</span>
+<span id="L1151" class="LineNr">1151 </span>  <span class="Conceal">¦</span> start <span class="Special">&lt;-</span> add end,<span class="Constant"> 1</span>
+<span id="L1152" class="LineNr">1152 </span>  <span class="Conceal">¦</span> curr-result <span class="Special">&lt;-</span> add curr-result,<span class="Constant"> 1</span>
+<span id="L1153" class="LineNr">1153 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1154" class="LineNr">1154 </span>  <span class="Delimiter">}</span>
 <span id="L1155" class="LineNr">1155 </span>]
 <span id="L1156" class="LineNr">1156 </span>
@@ -1218,17 +1219,17 @@ if ('onhashchange' in window) {
 <span id="L1158" class="LineNr">1158 </span>  <span class="Constant">local-scope</span>
 <span id="L1159" class="LineNr">1159 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[a/b]</span>
 <span id="L1160" class="LineNr">1160 </span>  run [
-<span id="L1161" class="LineNr">1161 </span>    y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
-<span id="L1162" class="LineNr">1162 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
-<span id="L1163" class="LineNr">1163 </span>    a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
-<span id="L1164" class="LineNr">1164 </span>    b:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 1</span>
-<span id="L1165" class="LineNr">1165 </span>    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
-<span id="L1166" class="LineNr">1166 </span>    30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *b
+<span id="L1161" class="LineNr">1161 </span>  <span class="Conceal">¦</span> y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
+<span id="L1162" class="LineNr">1162 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
+<span id="L1163" class="LineNr">1163 </span>  <span class="Conceal">¦</span> a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
+<span id="L1164" class="LineNr">1164 </span>  <span class="Conceal">¦</span> b:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 1</span>
+<span id="L1165" class="LineNr">1165 </span>  <span class="Conceal">¦</span> 20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
+<span id="L1166" class="LineNr">1166 </span>  <span class="Conceal">¦</span> 30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *b
 <span id="L1167" class="LineNr">1167 </span>  ]
 <span id="L1168" class="LineNr">1168 </span>  memory-should-contain [
-<span id="L1169" class="LineNr">1169 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># length of result</span>
-<span id="L1170" class="LineNr">1170 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
-<span id="L1171" class="LineNr">1171 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
+<span id="L1169" class="LineNr">1169 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># length of result</span>
+<span id="L1170" class="LineNr">1170 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
+<span id="L1171" class="LineNr">1171 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
 <span id="L1172" class="LineNr">1172 </span>  ]
 <span id="L1173" class="LineNr">1173 </span>]
 <span id="L1174" class="LineNr">1174 </span>
@@ -1236,20 +1237,20 @@ if ('onhashchange' in window) {
 <span id="L1176" class="LineNr">1176 </span>  <span class="Constant">local-scope</span>
 <span id="L1177" class="LineNr">1177 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[a/b/c]</span>
 <span id="L1178" class="LineNr">1178 </span>  run [
-<span id="L1179" class="LineNr">1179 </span>    y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
-<span id="L1180" class="LineNr">1180 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
-<span id="L1181" class="LineNr">1181 </span>    a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
-<span id="L1182" class="LineNr">1182 </span>    b:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 1</span>
-<span id="L1183" class="LineNr">1183 </span>    c:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 2</span>
-<span id="L1184" class="LineNr">1184 </span>    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
-<span id="L1185" class="LineNr">1185 </span>    30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *b
-<span id="L1186" class="LineNr">1186 </span>    40:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *c
+<span id="L1179" class="LineNr">1179 </span>  <span class="Conceal">¦</span> y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
+<span id="L1180" class="LineNr">1180 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
+<span id="L1181" class="LineNr">1181 </span>  <span class="Conceal">¦</span> a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
+<span id="L1182" class="LineNr">1182 </span>  <span class="Conceal">¦</span> b:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 1</span>
+<span id="L1183" class="LineNr">1183 </span>  <span class="Conceal">¦</span> c:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 2</span>
+<span id="L1184" class="LineNr">1184 </span>  <span class="Conceal">¦</span> 20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
+<span id="L1185" class="LineNr">1185 </span>  <span class="Conceal">¦</span> 30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *b
+<span id="L1186" class="LineNr">1186 </span>  <span class="Conceal">¦</span> 40:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *c
 <span id="L1187" class="LineNr">1187 </span>  ]
 <span id="L1188" class="LineNr">1188 </span>  memory-should-contain [
-<span id="L1189" class="LineNr">1189 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># length of result</span>
-<span id="L1190" class="LineNr">1190 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
-<span id="L1191" class="LineNr">1191 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
-<span id="L1192" class="LineNr">1192 </span>    40:array:character <span class="Special">&lt;-</span> <span class="Constant">[c]</span>
+<span id="L1189" class="LineNr">1189 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># length of result</span>
+<span id="L1190" class="LineNr">1190 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
+<span id="L1191" class="LineNr">1191 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
+<span id="L1192" class="LineNr">1192 </span>  <span class="Conceal">¦</span> 40:array:character <span class="Special">&lt;-</span> <span class="Constant">[c]</span>
 <span id="L1193" class="LineNr">1193 </span>  ]
 <span id="L1194" class="LineNr">1194 </span>]
 <span id="L1195" class="LineNr">1195 </span>
@@ -1257,14 +1258,14 @@ if ('onhashchange' in window) {
 <span id="L1197" class="LineNr">1197 </span>  <span class="Constant">local-scope</span>
 <span id="L1198" class="LineNr">1198 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1199" class="LineNr">1199 </span>  run [
-<span id="L1200" class="LineNr">1200 </span>    y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
-<span id="L1201" class="LineNr">1201 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
-<span id="L1202" class="LineNr">1202 </span>    a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
-<span id="L1203" class="LineNr">1203 </span>    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
+<span id="L1200" class="LineNr">1200 </span>  <span class="Conceal">¦</span> y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
+<span id="L1201" class="LineNr">1201 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
+<span id="L1202" class="LineNr">1202 </span>  <span class="Conceal">¦</span> a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
+<span id="L1203" class="LineNr">1203 </span>  <span class="Conceal">¦</span> 20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
 <span id="L1204" class="LineNr">1204 </span>  ]
 <span id="L1205" class="LineNr">1205 </span>  memory-should-contain [
-<span id="L1206" class="LineNr">1206 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># length of result</span>
-<span id="L1207" class="LineNr">1207 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L1206" class="LineNr">1206 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># length of result</span>
+<span id="L1207" class="LineNr">1207 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L1208" class="LineNr">1208 </span>  ]
 <span id="L1209" class="LineNr">1209 </span>]
 <span id="L1210" class="LineNr">1210 </span>
@@ -1272,11 +1273,11 @@ if ('onhashchange' in window) {
 <span id="L1212" class="LineNr">1212 </span>  <span class="Constant">local-scope</span>
 <span id="L1213" class="LineNr">1213 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
 <span id="L1214" class="LineNr">1214 </span>  run [
-<span id="L1215" class="LineNr">1215 </span>    y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
-<span id="L1216" class="LineNr">1216 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
+<span id="L1215" class="LineNr">1215 </span>  <span class="Conceal">¦</span> y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x, <span class="Constant">47/slash</span>
+<span id="L1216" class="LineNr">1216 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
 <span id="L1217" class="LineNr">1217 </span>  ]
 <span id="L1218" class="LineNr">1218 </span>  memory-should-contain [
-<span id="L1219" class="LineNr">1219 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty result</span>
+<span id="L1219" class="LineNr">1219 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty result</span>
 <span id="L1220" class="LineNr">1220 </span>  ]
 <span id="L1221" class="LineNr">1221 </span>]
 <span id="L1222" class="LineNr">1222 </span>
@@ -1284,23 +1285,23 @@ if ('onhashchange' in window) {
 <span id="L1224" class="LineNr">1224 </span>  <span class="Constant">local-scope</span>
 <span id="L1225" class="LineNr">1225 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[a/b//c]</span>
 <span id="L1226" class="LineNr">1226 </span>  run [
-<span id="L1227" class="LineNr">1227 </span>    y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x:text, <span class="Constant">47/slash</span>
-<span id="L1228" class="LineNr">1228 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
-<span id="L1229" class="LineNr">1229 </span>    a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
-<span id="L1230" class="LineNr">1230 </span>    b:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 1</span>
-<span id="L1231" class="LineNr">1231 </span>    c:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 2</span>
-<span id="L1232" class="LineNr">1232 </span>    d:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 3</span>
-<span id="L1233" class="LineNr">1233 </span>    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
-<span id="L1234" class="LineNr">1234 </span>    30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *b
-<span id="L1235" class="LineNr">1235 </span>    40:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *c
-<span id="L1236" class="LineNr">1236 </span>    50:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *d
+<span id="L1227" class="LineNr">1227 </span>  <span class="Conceal">¦</span> y:&amp;:@:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1115'>split</a> x:text, <span class="Constant">47/slash</span>
+<span id="L1228" class="LineNr">1228 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> length *y
+<span id="L1229" class="LineNr">1229 </span>  <span class="Conceal">¦</span> a:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 0</span>
+<span id="L1230" class="LineNr">1230 </span>  <span class="Conceal">¦</span> b:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 1</span>
+<span id="L1231" class="LineNr">1231 </span>  <span class="Conceal">¦</span> c:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 2</span>
+<span id="L1232" class="LineNr">1232 </span>  <span class="Conceal">¦</span> d:text <span class="Special">&lt;-</span> index *y,<span class="Constant"> 3</span>
+<span id="L1233" class="LineNr">1233 </span>  <span class="Conceal">¦</span> 20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *a
+<span id="L1234" class="LineNr">1234 </span>  <span class="Conceal">¦</span> 30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *b
+<span id="L1235" class="LineNr">1235 </span>  <span class="Conceal">¦</span> 40:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *c
+<span id="L1236" class="LineNr">1236 </span>  <span class="Conceal">¦</span> 50:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *d
 <span id="L1237" class="LineNr">1237 </span>  ]
 <span id="L1238" class="LineNr">1238 </span>  memory-should-contain [
-<span id="L1239" class="LineNr">1239 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># length of result</span>
-<span id="L1240" class="LineNr">1240 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
-<span id="L1241" class="LineNr">1241 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
-<span id="L1242" class="LineNr">1242 </span>    40:array:character <span class="Special">&lt;-</span> <span class="Constant">[]</span>
-<span id="L1243" class="LineNr">1243 </span>    50:array:character <span class="Special">&lt;-</span> <span class="Constant">[c]</span>
+<span id="L1239" class="LineNr">1239 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># length of result</span>
+<span id="L1240" class="LineNr">1240 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
+<span id="L1241" class="LineNr">1241 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
+<span id="L1242" class="LineNr">1242 </span>  <span class="Conceal">¦</span> 40:array:character <span class="Special">&lt;-</span> <span class="Constant">[]</span>
+<span id="L1243" class="LineNr">1243 </span>  <span class="Conceal">¦</span> 50:array:character <span class="Special">&lt;-</span> <span class="Constant">[c]</span>
 <span id="L1244" class="LineNr">1244 </span>  ]
 <span id="L1245" class="LineNr">1245 </span>]
 <span id="L1246" class="LineNr">1246 </span>
@@ -1310,11 +1311,11 @@ if ('onhashchange' in window) {
 <span id="L1250" class="LineNr">1250 </span>  <span class="Comment"># empty text? return empty texts</span>
 <span id="L1251" class="LineNr">1251 </span>  len:num <span class="Special">&lt;-</span> length *text
 <span id="L1252" class="LineNr">1252 </span>  <span class="Delimiter">{</span>
-<span id="L1253" class="LineNr">1253 </span>    empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
-<span id="L1254" class="LineNr">1254 </span>    <span class="muControl">break-unless</span> empty?
-<span id="L1255" class="LineNr">1255 </span>    x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
-<span id="L1256" class="LineNr">1256 </span>    y:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
-<span id="L1257" class="LineNr">1257 </span>    <span class="muControl">return</span>
+<span id="L1253" class="LineNr">1253 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
+<span id="L1254" class="LineNr">1254 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> empty?
+<span id="L1255" class="LineNr">1255 </span>  <span class="Conceal">¦</span> x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
+<span id="L1256" class="LineNr">1256 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
+<span id="L1257" class="LineNr">1257 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L1258" class="LineNr">1258 </span>  <span class="Delimiter">}</span>
 <span id="L1259" class="LineNr">1259 </span>  idx:num <span class="Special">&lt;-</span> find-next text, delim,<span class="Constant"> 0</span>
 <span id="L1260" class="LineNr">1260 </span>  x:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> text,<span class="Constant"> 0</span>, idx
@@ -1326,13 +1327,13 @@ if ('onhashchange' in window) {
 <span id="L1266" class="LineNr">1266 </span>  <span class="Constant">local-scope</span>
 <span id="L1267" class="LineNr">1267 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[a/b]</span>
 <span id="L1268" class="LineNr">1268 </span>  run [
-<span id="L1269" class="LineNr">1269 </span>    y:text, z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1247'>split-first</a> x, <span class="Constant">47/slash</span>
-<span id="L1270" class="LineNr">1270 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
-<span id="L1271" class="LineNr">1271 </span>    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L1269" class="LineNr">1269 </span>  <span class="Conceal">¦</span> y:text, z:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1247'>split-first</a> x, <span class="Constant">47/slash</span>
+<span id="L1270" class="LineNr">1270 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L1271" class="LineNr">1271 </span>  <span class="Conceal">¦</span> 20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
 <span id="L1272" class="LineNr">1272 </span>  ]
 <span id="L1273" class="LineNr">1273 </span>  memory-should-contain [
-<span id="L1274" class="LineNr">1274 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
-<span id="L1275" class="LineNr">1275 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
+<span id="L1274" class="LineNr">1274 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
+<span id="L1275" class="LineNr">1275 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[b]</span>
 <span id="L1276" class="LineNr">1276 </span>  ]
 <span id="L1277" class="LineNr">1277 </span>]
 <span id="L1278" class="LineNr">1278 </span>
@@ -1349,13 +1350,13 @@ if ('onhashchange' in window) {
 <span id="L1289" class="LineNr">1289 </span>  src-idx:num <span class="Special">&lt;-</span> copy start
 <span id="L1290" class="LineNr">1290 </span>  dest-idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L1291" class="LineNr">1291 </span>  <span class="Delimiter">{</span>
-<span id="L1292" class="LineNr">1292 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal src-idx, end
-<span id="L1293" class="LineNr">1293 </span>    <span class="muControl">break-if</span> done?
-<span id="L1294" class="LineNr">1294 </span>    src:char <span class="Special">&lt;-</span> index *buf, src-idx
-<span id="L1295" class="LineNr">1295 </span>    *result <span class="Special">&lt;-</span> put-index *result, dest-idx, src
-<span id="L1296" class="LineNr">1296 </span>    src-idx <span class="Special">&lt;-</span> add src-idx,<span class="Constant"> 1</span>
-<span id="L1297" class="LineNr">1297 </span>    dest-idx <span class="Special">&lt;-</span> add dest-idx,<span class="Constant"> 1</span>
-<span id="L1298" class="LineNr">1298 </span>    <span class="muControl">loop</span>
+<span id="L1292" class="LineNr">1292 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal src-idx, end
+<span id="L1293" class="LineNr">1293 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L1294" class="LineNr">1294 </span>  <span class="Conceal">¦</span> src:char <span class="Special">&lt;-</span> index *buf, src-idx
+<span id="L1295" class="LineNr">1295 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, dest-idx, src
+<span id="L1296" class="LineNr">1296 </span>  <span class="Conceal">¦</span> src-idx <span class="Special">&lt;-</span> add src-idx,<span class="Constant"> 1</span>
+<span id="L1297" class="LineNr">1297 </span>  <span class="Conceal">¦</span> dest-idx <span class="Special">&lt;-</span> add dest-idx,<span class="Constant"> 1</span>
+<span id="L1298" class="LineNr">1298 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
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 <span id="L1300" class="LineNr">1300 </span>]
 <span id="L1301" class="LineNr">1301 </span>
@@ -1363,11 +1364,11 @@ if ('onhashchange' in window) {
 <span id="L1303" class="LineNr">1303 </span>  <span class="Constant">local-scope</span>
 <span id="L1304" class="LineNr">1304 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1305" class="LineNr">1305 </span>  run [
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-<span id="L1307" class="LineNr">1307 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L1306" class="LineNr">1306 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> x,<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L1307" class="LineNr">1307 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
 <span id="L1308" class="LineNr">1308 </span>  ]
 <span id="L1309" class="LineNr">1309 </span>  memory-should-contain [
-<span id="L1310" class="LineNr">1310 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[bc]</span>
+<span id="L1310" class="LineNr">1310 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[bc]</span>
 <span id="L1311" class="LineNr">1311 </span>  ]
 <span id="L1312" class="LineNr">1312 </span>]
 <span id="L1313" class="LineNr">1313 </span>
@@ -1375,11 +1376,11 @@ if ('onhashchange' in window) {
 <span id="L1315" class="LineNr">1315 </span>  <span class="Constant">local-scope</span>
 <span id="L1316" class="LineNr">1316 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1317" class="LineNr">1317 </span>  run [
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-<span id="L1319" class="LineNr">1319 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L1318" class="LineNr">1318 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> x,<span class="Constant"> 2</span>,<span class="Constant"> 4</span>
+<span id="L1319" class="LineNr">1319 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
 <span id="L1320" class="LineNr">1320 </span>  ]
 <span id="L1321" class="LineNr">1321 </span>  memory-should-contain [
-<span id="L1322" class="LineNr">1322 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[c]</span>
+<span id="L1322" class="LineNr">1322 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[c]</span>
 <span id="L1323" class="LineNr">1323 </span>  ]
 <span id="L1324" class="LineNr">1324 </span>]
 <span id="L1325" class="LineNr">1325 </span>
@@ -1387,11 +1388,11 @@ if ('onhashchange' in window) {
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 <span id="L1328" class="LineNr">1328 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[abc]</span>
 <span id="L1329" class="LineNr">1329 </span>  run [
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-<span id="L1331" class="LineNr">1331 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L1330" class="LineNr">1330 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> x,<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
+<span id="L1331" class="LineNr">1331 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
 <span id="L1332" class="LineNr">1332 </span>  ]
 <span id="L1333" class="LineNr">1333 </span>  memory-should-contain [
-<span id="L1334" class="LineNr">1334 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[]</span>
+<span id="L1334" class="LineNr">1334 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[]</span>
 <span id="L1335" class="LineNr">1335 </span>  ]
 <span id="L1336" class="LineNr">1336 </span>]
 <span id="L1337" class="LineNr">1337 </span>
@@ -1403,16 +1404,16 @@ if ('onhashchange' in window) {
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 <span id="L1344" class="LineNr">1344 </span>  len:num <span class="Special">&lt;-</span> length *in
 <span id="L1345" class="LineNr">1345 </span>  <span class="Delimiter">{</span>
-<span id="L1346" class="LineNr">1346 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L1347" class="LineNr">1347 </span>    <span class="muControl">break-if</span> done?
-<span id="L1348" class="LineNr">1348 </span>    c:char <span class="Special">&lt;-</span> index *in, i
-<span id="L1349" class="LineNr">1349 </span>    x:num <span class="Special">&lt;-</span> character-to-code c
-<span id="L1350" class="LineNr">1350 </span>    digit:num, error?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> x
-<span id="L1351" class="LineNr">1351 </span>    <span class="muControl">reply-if</span> error?
-<span id="L1352" class="LineNr">1352 </span>    result <span class="Special">&lt;-</span> multiply result,<span class="Constant"> 10</span>
-<span id="L1353" class="LineNr">1353 </span>    result <span class="Special">&lt;-</span> add result, digit
-<span id="L1354" class="LineNr">1354 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L1355" class="LineNr">1355 </span>    <span class="muControl">loop</span>
+<span id="L1346" class="LineNr">1346 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L1347" class="LineNr">1347 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L1348" class="LineNr">1348 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *in, i
+<span id="L1349" class="LineNr">1349 </span>  <span class="Conceal">¦</span> x:num <span class="Special">&lt;-</span> character-to-code c
+<span id="L1350" class="LineNr">1350 </span>  <span class="Conceal">¦</span> digit:num, error?:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> x
+<span id="L1351" class="LineNr">1351 </span>  <span class="Conceal">¦</span> <span class="muControl">reply-if</span> error?
+<span id="L1352" class="LineNr">1352 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> multiply result,<span class="Constant"> 10</span>
+<span id="L1353" class="LineNr">1353 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> add result, digit
+<span id="L1354" class="LineNr">1354 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L1355" class="LineNr">1355 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1356" class="LineNr">1356 </span>  <span class="Delimiter">}</span>
 <span id="L1357" class="LineNr">1357 </span>  <span class="Comment"># no error; all digits were valid</span>
 <span id="L1358" class="LineNr">1358 </span>  out <span class="Special">&lt;-</span> copy result
@@ -1434,11 +1435,11 @@ if ('onhashchange' in window) {
 <span id="L1374" class="LineNr">1374 </span>  <span class="Constant">local-scope</span>
 <span id="L1375" class="LineNr">1375 </span>  a:number <span class="Special">&lt;-</span> copy<span class="Constant"> 48</span>  <span class="Comment"># character code for '0'</span>
 <span id="L1376" class="LineNr">1376 </span>  run [
-<span id="L1377" class="LineNr">1377 </span>    10:number/<span class="Special">raw</span>, 11:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
+<span id="L1377" class="LineNr">1377 </span>  <span class="Conceal">¦</span> 10:number/<span class="Special">raw</span>, 11:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
 <span id="L1378" class="LineNr">1378 </span>  ]
 <span id="L1379" class="LineNr">1379 </span>  memory-should-contain [
-<span id="L1380" class="LineNr">1380 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L1381" class="LineNr">1381 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no error</span>
+<span id="L1380" class="LineNr">1380 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1381" class="LineNr">1381 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no error</span>
 <span id="L1382" class="LineNr">1382 </span>  ]
 <span id="L1383" class="LineNr">1383 </span>]
 <span id="L1384" class="LineNr">1384 </span>
@@ -1446,11 +1447,11 @@ if ('onhashchange' in window) {
 <span id="L1386" class="LineNr">1386 </span>  <span class="Constant">local-scope</span>
 <span id="L1387" class="LineNr">1387 </span>  a:number <span class="Special">&lt;-</span> copy<span class="Constant"> 57</span>  <span class="Comment"># character code for '9'</span>
 <span id="L1388" class="LineNr">1388 </span>  run [
-<span id="L1389" class="LineNr">1389 </span>    1:number/<span class="Special">raw</span>, 2:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
+<span id="L1389" class="LineNr">1389 </span>  <span class="Conceal">¦</span> 1:number/<span class="Special">raw</span>, 2:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
 <span id="L1390" class="LineNr">1390 </span>  ]
 <span id="L1391" class="LineNr">1391 </span>  memory-should-contain [
-<span id="L1392" class="LineNr">1392 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 9</span>
-<span id="L1393" class="LineNr">1393 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no error</span>
+<span id="L1392" class="LineNr">1392 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 9</span>
+<span id="L1393" class="LineNr">1393 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no error</span>
 <span id="L1394" class="LineNr">1394 </span>  ]
 <span id="L1395" class="LineNr">1395 </span>]
 <span id="L1396" class="LineNr">1396 </span>
@@ -1458,11 +1459,11 @@ if ('onhashchange' in window) {
 <span id="L1398" class="LineNr">1398 </span>  <span class="Constant">local-scope</span>
 <span id="L1399" class="LineNr">1399 </span>  a:number <span class="Special">&lt;-</span> copy<span class="Constant"> 47</span>
 <span id="L1400" class="LineNr">1400 </span>  run [
-<span id="L1401" class="LineNr">1401 </span>    10:number/<span class="Special">raw</span>, 11:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
+<span id="L1401" class="LineNr">1401 </span>  <span class="Conceal">¦</span> 10:number/<span class="Special">raw</span>, 11:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
 <span id="L1402" class="LineNr">1402 </span>  ]
 <span id="L1403" class="LineNr">1403 </span>  memory-should-contain [
-<span id="L1404" class="LineNr">1404 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L1405" class="LineNr">1405 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># error</span>
+<span id="L1404" class="LineNr">1404 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1405" class="LineNr">1405 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># error</span>
 <span id="L1406" class="LineNr">1406 </span>  ]
 <span id="L1407" class="LineNr">1407 </span>]
 <span id="L1408" class="LineNr">1408 </span>
@@ -1470,11 +1471,11 @@ if ('onhashchange' in window) {
 <span id="L1410" class="LineNr">1410 </span>  <span class="Constant">local-scope</span>
 <span id="L1411" class="LineNr">1411 </span>  a:number <span class="Special">&lt;-</span> copy<span class="Constant"> 58</span>
 <span id="L1412" class="LineNr">1412 </span>  run [
-<span id="L1413" class="LineNr">1413 </span>    10:number/<span class="Special">raw</span>, 11:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
+<span id="L1413" class="LineNr">1413 </span>  <span class="Conceal">¦</span> 10:number/<span class="Special">raw</span>, 11:boolean/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='061text.mu.html#L1362'>character-code-to-digit</a> a
 <span id="L1414" class="LineNr">1414 </span>  ]
 <span id="L1415" class="LineNr">1415 </span>  memory-should-contain [
-<span id="L1416" class="LineNr">1416 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L1417" class="LineNr">1417 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># error</span>
+<span id="L1416" class="LineNr">1416 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1417" class="LineNr">1417 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># error</span>
 <span id="L1418" class="LineNr">1418 </span>  ]
 <span id="L1419" class="LineNr">1419 </span>]
 </pre>
diff --git a/html/062convert_ingredients_to_text.cc.html b/html/062convert_ingredients_to_text.cc.html
index 09b0cd2c..798631f9 100644
--- a/html/062convert_ingredients_to_text.cc.html
+++ b/html/062convert_ingredients_to_text.cc.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
 .Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.muData { color: #ffff00; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.Constant { color: #00a0a0; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -129,40 +130,40 @@ if ('onhashchange' in window) {
 <span id="L68" class="LineNr"> 68 </span><span class="Normal">void</span> convert_ingredients_to_text<span class="Delimiter">(</span>recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L69" class="LineNr"> 69 </span>  vector&lt;instruction&gt; new_instructions<span class="Delimiter">;</span>
 <span id="L70" class="LineNr"> 70 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>    instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Comment">// all these cases are getting hairy. how can we make this extensible?</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;stash&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L74" class="LineNr"> 74 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L75" class="LineNr"> 75 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L76" class="LineNr"> 76 </span>        ostringstream ingredient_name<span class="Delimiter">;</span>
-<span id="L77" class="LineNr"> 77 </span>        ingredient_name &lt;&lt; <span class="Constant">&quot;stash_&quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">;</span>
-<span id="L78" class="LineNr"> 78 </span>        convert_ingredient_to_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> new_instructions<span class="Delimiter">,</span> ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
-<span id="L79" class="LineNr"> 79 </span>      <span class="Delimiter">}</span>
-<span id="L80" class="LineNr"> 80 </span>    <span class="Delimiter">}</span>
-<span id="L81" class="LineNr"> 81 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L82" class="LineNr"> 82 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Comment">/*</span><span class="Comment">skip</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L83" class="LineNr"> 83 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L84" class="LineNr"> 84 </span>        ostringstream ingredient_name<span class="Delimiter">;</span>
-<span id="L85" class="LineNr"> 85 </span>        ingredient_name &lt;&lt; <span class="Constant">&quot;trace_&quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">;</span>
-<span id="L86" class="LineNr"> 86 </span>        convert_ingredient_to_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> new_instructions<span class="Delimiter">,</span> ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
-<span id="L87" class="LineNr"> 87 </span>      <span class="Delimiter">}</span>
-<span id="L88" class="LineNr"> 88 </span>    <span class="Delimiter">}</span>
-<span id="L89" class="LineNr"> 89 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name_before_rewrite == <span class="Constant">&quot;append&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>      <span class="Comment">// override only variants that try to append to a string</span>
-<span id="L91" class="LineNr"> 91 </span>      <span class="Comment">// Beware: this hack restricts how much 'append' can be overridden. Any</span>
-<span id="L92" class="LineNr"> 92 </span>      <span class="Comment">// new variants that match:</span>
-<span id="L93" class="LineNr"> 93 </span>      <span class="Comment">//   append _:text, ___</span>
-<span id="L94" class="LineNr"> 94 </span>      <span class="Comment">// will never ever get used.</span>
-<span id="L95" class="LineNr"> 95 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || <a href='027call_ingredient.cc.html#L174'>is_mu_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>        <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Comment">/*</span><span class="Comment">skip base</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L97" class="LineNr"> 97 </span>          ostringstream ingredient_name<span class="Delimiter">;</span>
-<span id="L98" class="LineNr"> 98 </span>          ingredient_name &lt;&lt; <span class="Constant">&quot;append_&quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">;</span>
-<span id="L99" class="LineNr"> 99 </span>          convert_ingredient_to_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> new_instructions<span class="Delimiter">,</span> ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
-<span id="L100" class="LineNr">100 </span>        <span class="Delimiter">}</span>
-<span id="L101" class="LineNr">101 </span>      <span class="Delimiter">}</span>
-<span id="L102" class="LineNr">102 </span>    <span class="Delimiter">}</span>
-<span id="L103" class="LineNr">103 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L104" class="LineNr">104 </span>    new_instructions<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Comment">// all these cases are getting hairy. how can we make this extensible?</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;stash&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream ingredient_name<span class="Delimiter">;</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ingredient_name &lt;&lt; <span class="Constant">&quot;stash_&quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">;</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> convert_ingredient_to_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> new_instructions<span class="Delimiter">,</span> ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Comment">/*</span><span class="Comment">skip</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream ingredient_name<span class="Delimiter">;</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ingredient_name &lt;&lt; <span class="Constant">&quot;trace_&quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">;</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> convert_ingredient_to_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> new_instructions<span class="Delimiter">,</span> ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name_before_rewrite == <span class="Constant">&quot;append&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// override only variants that try to append to a string</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// Beware: this hack restricts how much 'append' can be overridden. Any</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// new variants that match:</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">//   append _:text, ___</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// will never ever get used.</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='014literal_string.cc.html#L126'>is_literal_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> || <a href='027call_ingredient.cc.html#L174'>is_mu_text</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Comment">/*</span><span class="Comment">skip base</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream ingredient_name<span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ingredient_name &lt;&lt; <span class="Constant">&quot;append_&quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; j &lt;&lt; <span class="Constant">&quot;:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">;</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> convert_ingredient_to_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">),</span> new_instructions<span class="Delimiter">,</span> ingredient_name<span class="Delimiter">.</span>str<span class="Delimiter">());</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> new_instructions<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>inst<span class="Delimiter">);</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Delimiter">}</span>
 <span id="L106" class="LineNr">106 </span>  caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>swap<span class="Delimiter">(</span>new_instructions<span class="Delimiter">);</span>
 <span id="L107" class="LineNr">107 </span><span class="Delimiter">}</span>
@@ -176,14 +177,14 @@ if ('onhashchange' in window) {
 <span id="L115" class="LineNr">115 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_static_array<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L116" class="LineNr">116 </span>  <a href='010vm.cc.html#L32'>instruction</a> def<span class="Delimiter">;</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_lookup_of_address_of_array<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L118" class="LineNr">118 </span>    def<span class="Delimiter">.</span>name = <span class="Constant">&quot;array-to-text-line&quot;</span><span class="Delimiter">;</span>
-<span id="L119" class="LineNr">119 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = r<span class="Delimiter">;</span>
-<span id="L120" class="LineNr">120 </span>    drop_one_lookup<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
-<span id="L121" class="LineNr">121 </span>    def<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> def<span class="Delimiter">.</span>name = <span class="Constant">&quot;array-to-text-line&quot;</span><span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = r<span class="Delimiter">;</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> drop_one_lookup<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> def<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>tmp<span class="Delimiter">);</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Delimiter">}</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L124" class="LineNr">124 </span>    def<span class="Delimiter">.</span>name = <span class="Constant">&quot;to-text-line&quot;</span><span class="Delimiter">;</span>
-<span id="L125" class="LineNr">125 </span>    def<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> def<span class="Delimiter">.</span>name = <span class="Constant">&quot;to-text-line&quot;</span><span class="Delimiter">;</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> def<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
 <span id="L126" class="LineNr">126 </span>  <span class="Delimiter">}</span>
 <span id="L127" class="LineNr">127 </span>  def<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span>tmp_var<span class="Delimiter">));</span>
 <span id="L128" class="LineNr">128 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>def<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
diff --git a/html/063array.mu.html b/html/063array.mu.html
index e94f78f2..7dc35c5a 100644
--- a/html/063array.mu.html
+++ b/html/063array.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .muControl { color: #c0a020; }
+.Delimiter { color: #800080; }
 .Special { color: #c00000; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
 -->
 </style>
 
@@ -59,15 +60,15 @@ if ('onhashchange' in window) {
 <pre id='vimCodeElement'>
 <span id="L1" class="LineNr">  1 </span><span class="muScenario">scenario</span> array-from-args [
 <span id="L2" class="LineNr">  2 </span>  run [
-<span id="L3" class="LineNr">  3 </span>    <span class="Constant">local-scope</span>
-<span id="L4" class="LineNr">  4 </span>    x:&amp;:@:num <span class="Special">&lt;-</span> <a href='063array.mu.html#L16'>new-array</a><span class="Constant"> 0</span>,<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L5" class="LineNr">  5 </span>    10:@:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
+<span id="L3" class="LineNr">  3 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L4" class="LineNr">  4 </span>  <span class="Conceal">¦</span> x:&amp;:@:num <span class="Special">&lt;-</span> <a href='063array.mu.html#L16'>new-array</a><span class="Constant"> 0</span>,<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L5" class="LineNr">  5 </span>  <span class="Conceal">¦</span> 10:@:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *x
 <span id="L6" class="LineNr">  6 </span>  ]
 <span id="L7" class="LineNr">  7 </span>  memory-should-contain [
-<span id="L8" class="LineNr">  8 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># array length</span>
-<span id="L9" class="LineNr">  9 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L10" class="LineNr"> 10 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L11" class="LineNr"> 11 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L8" class="LineNr">  8 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># array length</span>
+<span id="L9" class="LineNr">  9 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L12" class="LineNr"> 12 </span>  ]
 <span id="L13" class="LineNr"> 13 </span>]
 <span id="L14" class="LineNr"> 14 </span>
@@ -76,24 +77,24 @@ if ('onhashchange' in window) {
 <span id="L17" class="LineNr"> 17 </span>  <span class="Constant">local-scope</span>
 <span id="L18" class="LineNr"> 18 </span>  <a href='075channel.mu.html#L379'>capacity</a>:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="Delimiter">{</span>
-<span id="L20" class="LineNr"> 20 </span>    <span class="Comment"># while read curr-value</span>
-<span id="L21" class="LineNr"> 21 </span>    curr-value:_elem, exists?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L22" class="LineNr"> 22 </span>    <span class="muControl">break-unless</span> exists?
-<span id="L23" class="LineNr"> 23 </span>    <a href='075channel.mu.html#L379'>capacity</a> <span class="Special">&lt;-</span> add <a href='075channel.mu.html#L379'>capacity</a>,<span class="Constant"> 1</span>
-<span id="L24" class="LineNr"> 24 </span>    <span class="muControl">loop</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <span class="Comment"># while read curr-value</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> curr-value:_elem, exists?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> exists?
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <a href='075channel.mu.html#L379'>capacity</a> <span class="Special">&lt;-</span> add <a href='075channel.mu.html#L379'>capacity</a>,<span class="Constant"> 1</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Delimiter">}</span>
 <span id="L26" class="LineNr"> 26 </span>  result <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>, <a href='075channel.mu.html#L379'>capacity</a>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Constant">rewind-ingredients</span>
 <span id="L28" class="LineNr"> 28 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L29" class="LineNr"> 29 </span>  <span class="Delimiter">{</span>
-<span id="L30" class="LineNr"> 30 </span>    <span class="Comment"># while read curr-value</span>
-<span id="L31" class="LineNr"> 31 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, <a href='075channel.mu.html#L379'>capacity</a>
-<span id="L32" class="LineNr"> 32 </span>    <span class="muControl">break-if</span> done?
-<span id="L33" class="LineNr"> 33 </span>    curr-value:_elem, exists?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L34" class="LineNr"> 34 </span>    assert exists?, <span class="Constant">[error in rewinding ingredients to new-array]</span>
-<span id="L35" class="LineNr"> 35 </span>    *result <span class="Special">&lt;-</span> put-index *result, i, curr-value
-<span id="L36" class="LineNr"> 36 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="muControl">loop</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Comment"># while read curr-value</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, <a href='075channel.mu.html#L379'>capacity</a>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> curr-value:_elem, exists?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> assert exists?, <span class="Constant">[error in rewinding ingredients to new-array]</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, i, curr-value
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diff --git a/html/064list.mu.html b/html/064list.mu.html
index 417280f5..e0cd961c 100644
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@@ -90,22 +91,22 @@ if ('onhashchange' in window) {
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 <span id="L32" class="LineNr"> 32 </span>  run [
-<span id="L33" class="LineNr"> 33 </span>    <span class="Constant">local-scope</span>
-<span id="L34" class="LineNr"> 34 </span>    x:&amp;:list:num <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L35" class="LineNr"> 35 </span>    x <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, x
-<span id="L36" class="LineNr"> 36 </span>    x <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, x
-<span id="L37" class="LineNr"> 37 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
-<span id="L38" class="LineNr"> 38 </span>    x <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> x
-<span id="L39" class="LineNr"> 39 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
-<span id="L40" class="LineNr"> 40 </span>    x <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> x
-<span id="L41" class="LineNr"> 41 </span>    12:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
-<span id="L42" class="LineNr"> 42 </span>    20:&amp;:list:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> x
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> x:&amp;:list:num <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, x
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, x
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> x
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> x
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> 12:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> 20:&amp;:list:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> x
 <span id="L43" class="LineNr"> 43 </span>  ]
 <span id="L44" class="LineNr"> 44 </span>  memory-should-contain [
-<span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
-<span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L47" class="LineNr"> 47 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L48" class="LineNr"> 48 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># nothing left</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># nothing left</span>
 <span id="L49" class="LineNr"> 49 </span>  ]
 <span id="L50" class="LineNr"> 50 </span>]
 <span id="L51" class="LineNr"> 51 </span>
@@ -135,23 +136,23 @@ if ('onhashchange' in window) {
 <span id="L75" class="LineNr"> 75 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L76" class="LineNr"> 76 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
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-<span id="L78" class="LineNr"> 78 </span>    list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list  <span class="Comment"># inside list</span>
-<span id="L79" class="LineNr"> 79 </span>    list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
-<span id="L80" class="LineNr"> 80 </span>    <span class="Comment"># check structure</span>
-<span id="L81" class="LineNr"> 81 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L82" class="LineNr"> 82 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L83" class="LineNr"> 83 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L84" class="LineNr"> 84 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L85" class="LineNr"> 85 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L86" class="LineNr"> 86 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L87" class="LineNr"> 87 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L88" class="LineNr"> 88 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list  <span class="Comment"># inside list</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
 <span id="L89" class="LineNr"> 89 </span>  ]
 <span id="L90" class="LineNr"> 90 </span>  memory-should-contain [
-<span id="L91" class="LineNr"> 91 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
-<span id="L92" class="LineNr"> 92 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L93" class="LineNr"> 93 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
-<span id="L94" class="LineNr"> 94 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L95" class="LineNr"> 95 </span>  ]
 <span id="L96" class="LineNr"> 96 </span>]
 <span id="L97" class="LineNr"> 97 </span>
@@ -161,24 +162,24 @@ if ('onhashchange' in window) {
 <span id="L101" class="LineNr">101 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L102" class="LineNr">102 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L103" class="LineNr">103 </span>  run [
-<span id="L104" class="LineNr">104 </span>    list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list  <span class="Comment"># inside list</span>
-<span id="L105" class="LineNr">105 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2  <span class="Comment"># now at end of list</span>
-<span id="L106" class="LineNr">106 </span>    list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
-<span id="L107" class="LineNr">107 </span>    <span class="Comment"># check structure like before</span>
-<span id="L108" class="LineNr">108 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L109" class="LineNr">109 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L110" class="LineNr">110 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L111" class="LineNr">111 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L112" class="LineNr">112 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L113" class="LineNr">113 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L114" class="LineNr">114 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L115" class="LineNr">115 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list  <span class="Comment"># inside list</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2  <span class="Comment"># now at end of list</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
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-<span id="L118" class="LineNr">118 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
-<span id="L119" class="LineNr">119 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L120" class="LineNr">120 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L121" class="LineNr">121 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
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 <span id="L123" class="LineNr">123 </span>]
 <span id="L124" class="LineNr">124 </span>
@@ -188,22 +189,22 @@ if ('onhashchange' in window) {
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 <span id="L129" class="LineNr">129 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L130" class="LineNr">130 </span>  run [
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-<span id="L132" class="LineNr">132 </span>    <span class="Comment"># check structure like before</span>
-<span id="L133" class="LineNr">133 </span>    list2:&amp;:list:char <span class="Special">&lt;-</span> copy list
-<span id="L134" class="LineNr">134 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L135" class="LineNr">135 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L136" class="LineNr">136 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L137" class="LineNr">137 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L138" class="LineNr">138 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L139" class="LineNr">139 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L140" class="LineNr">140 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> list2:&amp;:list:char <span class="Special">&lt;-</span> copy list
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
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-<span id="L145" class="LineNr">145 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L146" class="LineNr">146 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
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 <span id="L148" class="LineNr">148 </span>]
 <span id="L149" class="LineNr">149 </span>
@@ -226,11 +227,11 @@ if ('onhashchange' in window) {
 <span id="L166" class="LineNr">166 </span>  prev-node:&amp;:list:_elem <span class="Special">&lt;-</span> copy in
 <span id="L167" class="LineNr">167 </span>  curr:&amp;:list:_elem <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> prev-node
 <span id="L168" class="LineNr">168 </span>  <span class="Delimiter">{</span>
-<span id="L169" class="LineNr">169 </span>    <span class="muControl">return-unless</span> curr
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-<span id="L171" class="LineNr">171 </span>    <span class="muControl">break-if</span> found?
-<span id="L172" class="LineNr">172 </span>    prev-node <span class="Special">&lt;-</span> copy curr
-<span id="L173" class="LineNr">173 </span>    curr <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> curr
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> curr
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> equal curr, x
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> prev-node <span class="Special">&lt;-</span> copy curr
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> curr
 <span id="L174" class="LineNr">174 </span>  <span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Comment"># set its next pointer to skip 'x'</span>
 <span id="L176" class="LineNr">176 </span>  *prev-node <span class="Special">&lt;-</span> put *prev-node, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, next-node
@@ -242,21 +243,21 @@ if ('onhashchange' in window) {
 <span id="L182" class="LineNr">182 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L183" class="LineNr">183 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L184" class="LineNr">184 </span>  run [
-<span id="L185" class="LineNr">185 </span>    list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list  <span class="Comment"># second element</span>
-<span id="L186" class="LineNr">186 </span>    list <span class="Special">&lt;-</span> remove list2, list
-<span id="L187" class="LineNr">187 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
-<span id="L188" class="LineNr">188 </span>    <span class="Comment"># check structure like before</span>
-<span id="L189" class="LineNr">189 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L190" class="LineNr">190 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L191" class="LineNr">191 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L192" class="LineNr">192 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L193" class="LineNr">193 </span>    20:&amp;:list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list  <span class="Comment"># second element</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list2, list
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> 20:&amp;:list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
 <span id="L194" class="LineNr">194 </span>  ]
 <span id="L195" class="LineNr">195 </span>  memory-should-contain [
-<span id="L196" class="LineNr">196 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
-<span id="L197" class="LineNr">197 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
-<span id="L198" class="LineNr">198 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L199" class="LineNr">199 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
 <span id="L200" class="LineNr">200 </span>  ]
 <span id="L201" class="LineNr">201 </span>]
 <span id="L202" class="LineNr">202 </span>
@@ -266,18 +267,18 @@ if ('onhashchange' in window) {
 <span id="L206" class="LineNr">206 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L207" class="LineNr">207 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L208" class="LineNr">208 </span>  run [
-<span id="L209" class="LineNr">209 </span>    list <span class="Special">&lt;-</span> remove list, list
-<span id="L210" class="LineNr">210 </span>    <span class="Comment"># check structure like before</span>
-<span id="L211" class="LineNr">211 </span>    list2:&amp;:list:char <span class="Special">&lt;-</span> copy list
-<span id="L212" class="LineNr">212 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L213" class="LineNr">213 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L214" class="LineNr">214 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L215" class="LineNr">215 </span>    20:&amp;:list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list, list
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> list2:&amp;:list:char <span class="Special">&lt;-</span> copy list
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> 20:&amp;:list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
 <span id="L216" class="LineNr">216 </span>  ]
 <span id="L217" class="LineNr">217 </span>  memory-should-contain [
-<span id="L218" class="LineNr">218 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># scanning next, skipping deleted element</span>
-<span id="L219" class="LineNr">219 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L220" class="LineNr">220 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># scanning next, skipping deleted element</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
 <span id="L221" class="LineNr">221 </span>  ]
 <span id="L222" class="LineNr">222 </span>]
 <span id="L223" class="LineNr">223 </span>
@@ -287,23 +288,23 @@ if ('onhashchange' in window) {
 <span id="L227" class="LineNr">227 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L228" class="LineNr">228 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L229" class="LineNr">229 </span>  run [
-<span id="L230" class="LineNr">230 </span>    <span class="Comment"># delete last element</span>
-<span id="L231" class="LineNr">231 </span>    list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list
-<span id="L232" class="LineNr">232 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L233" class="LineNr">233 </span>    list <span class="Special">&lt;-</span> remove list2, list
-<span id="L234" class="LineNr">234 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
-<span id="L235" class="LineNr">235 </span>    <span class="Comment"># check structure like before</span>
-<span id="L236" class="LineNr">236 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L237" class="LineNr">237 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L238" class="LineNr">238 </span>    list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
-<span id="L239" class="LineNr">239 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L240" class="LineNr">240 </span>    20:&amp;:list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Comment"># delete last element</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> list2:&amp;:list:char <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list2, list
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span> 20:&amp;:list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> list2
 <span id="L241" class="LineNr">241 </span>  ]
 <span id="L242" class="LineNr">242 </span>  memory-should-contain [
-<span id="L243" class="LineNr">243 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
-<span id="L244" class="LineNr">244 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
-<span id="L245" class="LineNr">245 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L246" class="LineNr">246 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
 <span id="L247" class="LineNr">247 </span>  ]
 <span id="L248" class="LineNr">248 </span>]
 <span id="L249" class="LineNr">249 </span>
@@ -311,11 +312,11 @@ if ('onhashchange' in window) {
 <span id="L251" class="LineNr">251 </span>  <span class="Constant">local-scope</span>
 <span id="L252" class="LineNr">252 </span>  list:&amp;:list:char <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
 <span id="L253" class="LineNr">253 </span>  run [
-<span id="L254" class="LineNr">254 </span>    list <span class="Special">&lt;-</span> remove list, list
-<span id="L255" class="LineNr">255 </span>    1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy list
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list, list
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> 1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy list
 <span id="L256" class="LineNr">256 </span>  ]
 <span id="L257" class="LineNr">257 </span>  memory-should-contain [
-<span id="L258" class="LineNr">258 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># back to an empty list</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># back to an empty list</span>
 <span id="L259" class="LineNr">259 </span>  ]
 <span id="L260" class="LineNr">260 </span>]
 <span id="L261" class="LineNr">261 </span>
@@ -337,13 +338,13 @@ if ('onhashchange' in window) {
 <span id="L277" class="LineNr">277 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 2</span>, list
 <span id="L278" class="LineNr">278 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>, list
 <span id="L279" class="LineNr">279 </span>  run [
-<span id="L280" class="LineNr">280 </span>    stash <span class="Constant">[list:]</span>, list
-<span id="L281" class="LineNr">281 </span>    list <span class="Special">&lt;-</span> reverse list
-<span id="L282" class="LineNr">282 </span>    stash <span class="Constant">[reversed:]</span>, list
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> stash <span class="Constant">[list:]</span>, list
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> reverse list
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> stash <span class="Constant">[reversed:]</span>, list
 <span id="L283" class="LineNr">283 </span>  ]
 <span id="L284" class="LineNr">284 </span>  trace-should-contain [
-<span id="L285" class="LineNr">285 </span>    app: list:<span class="Constant"> 3</span><span class="muRecipe"> -&gt; </span>2<span class="muRecipe"> -&gt; </span>1
-<span id="L286" class="LineNr">286 </span>    app: reversed:<span class="Constant"> 1</span><span class="muRecipe"> -&gt; </span>2<span class="muRecipe"> -&gt; </span>3
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> app: list:<span class="Constant"> 3</span><span class="muRecipe"> -&gt; </span>2<span class="muRecipe"> -&gt; </span>1
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> app: reversed:<span class="Constant"> 1</span><span class="muRecipe"> -&gt; </span>2<span class="muRecipe"> -&gt; </span>3
 <span id="L287" class="LineNr">287 </span>  ]
 <span id="L288" class="LineNr">288 </span>]
 <span id="L289" class="LineNr">289 </span>
@@ -368,9 +369,9 @@ if ('onhashchange' in window) {
 <span id="L308" class="LineNr">308 </span>  <span class="Constant">local-scope</span>
 <span id="L309" class="LineNr">309 </span>  <span class="Constant">load-ingredients</span>
 <span id="L310" class="LineNr">310 </span>  <span class="Delimiter">{</span>
-<span id="L311" class="LineNr">311 </span>    <span class="muControl">break-if</span> in
-<span id="L312" class="LineNr">312 </span>    buf <span class="Special">&lt;-</span> append buf, <span class="Constant">[[]</span>]
-<span id="L313" class="LineNr">313 </span>    <span class="muControl">return</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> in
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, <span class="Constant">[[]</span>]
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Delimiter">}</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Comment"># append in.value to buf</span>
 <span id="L316" class="LineNr">316 </span>  val:_elem <span class="Special">&lt;-</span> get *in, <span class="Constant">value:offset</span>
@@ -383,17 +384,17 @@ if ('onhashchange' in window) {
 <span id="L323" class="LineNr">323 </span>  <span class="Comment"># and recurse</span>
 <span id="L324" class="LineNr">324 </span>  remaining:num, optional-ingredient-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L325" class="LineNr">325 </span>  <span class="Delimiter">{</span>
-<span id="L326" class="LineNr">326 </span>    <span class="muControl">break-if</span> optional-ingredient-found?
-<span id="L327" class="LineNr">327 </span>    <span class="Comment"># unlimited recursion</span>
-<span id="L328" class="LineNr">328 </span>    buf <span class="Special">&lt;-</span> <a href='064list.mu.html#L307'>to-buffer</a> <a href='065duplex_list.mu.html#L29'>next</a>, buf
-<span id="L329" class="LineNr">329 </span>    <span class="muControl">return</span>
+<span id="L326" class="LineNr">326 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> optional-ingredient-found?
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> <span class="Comment"># unlimited recursion</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> <a href='064list.mu.html#L307'>to-buffer</a> <a href='065duplex_list.mu.html#L29'>next</a>, buf
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L330" class="LineNr">330 </span>  <span class="Delimiter">}</span>
 <span id="L331" class="LineNr">331 </span>  <span class="Delimiter">{</span>
-<span id="L332" class="LineNr">332 </span>    <span class="muControl">break-unless</span> remaining
-<span id="L333" class="LineNr">333 </span>    <span class="Comment"># limited recursion</span>
-<span id="L334" class="LineNr">334 </span>    remaining <span class="Special">&lt;-</span> subtract remaining,<span class="Constant"> 1</span>
-<span id="L335" class="LineNr">335 </span>    buf <span class="Special">&lt;-</span> <a href='064list.mu.html#L307'>to-buffer</a> <a href='065duplex_list.mu.html#L29'>next</a>, buf, remaining
-<span id="L336" class="LineNr">336 </span>    <span class="muControl">return</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> remaining
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> <span class="Comment"># limited recursion</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> remaining <span class="Special">&lt;-</span> subtract remaining,<span class="Constant"> 1</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> <a href='064list.mu.html#L307'>to-buffer</a> <a href='065duplex_list.mu.html#L29'>next</a>, buf, remaining
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L337" class="LineNr">337 </span>  <span class="Delimiter">}</span>
 <span id="L338" class="LineNr">338 </span>  <span class="Comment"># past recursion depth; insert ellipses and stop</span>
 <span id="L339" class="LineNr">339 </span>  append buf, <span class="Constant">[...]</span>
@@ -403,10 +404,10 @@ if ('onhashchange' in window) {
 <span id="L343" class="LineNr">343 </span>  <span class="Constant">local-scope</span>
 <span id="L344" class="LineNr">344 </span>  x:&amp;:list:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L345" class="LineNr">345 </span>  run [
-<span id="L346" class="LineNr">346 </span>    stash x
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> stash x
 <span id="L347" class="LineNr">347 </span>  ]
 <span id="L348" class="LineNr">348 </span>  trace-should-contain [
-<span id="L349" class="LineNr">349 </span>    app: <span class="Constant">[]</span>
+<span id="L349" class="LineNr">349 </span>  <span class="Conceal">¦</span> app: <span class="Constant">[]</span>
 <span id="L350" class="LineNr">350 </span>  ]
 <span id="L351" class="LineNr">351 </span>]
 </pre>
diff --git a/html/065duplex_list.mu.html b/html/065duplex_list.mu.html
index 3beac519..360a37f3 100644
--- a/html/065duplex_list.mu.html
+++ b/html/065duplex_list.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -73,8 +74,8 @@ if ('onhashchange' in window) {
 <span id="L13" class="LineNr"> 13 </span>  result:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> new <span class="Delimiter">{</span>(duplex-list _elem): type<span class="Delimiter">}</span>
 <span id="L14" class="LineNr"> 14 </span>  *result <span class="Special">&lt;-</span> merge x, in,<span class="Constant"> 0</span>
 <span id="L15" class="LineNr"> 15 </span>  <span class="Delimiter">{</span>
-<span id="L16" class="LineNr"> 16 </span>    <span class="muControl">break-unless</span> in
-<span id="L17" class="LineNr"> 17 </span>    *in <span class="Special">&lt;-</span> put *in, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, result
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> in
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> *in <span class="Special">&lt;-</span> put *in, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, result
 <span id="L18" class="LineNr"> 18 </span>  <span class="Delimiter">}</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="muControl">return</span> result  <span class="Comment"># needed explicitly because we need to replace 'in' with 'result'</span>
 <span id="L20" class="LineNr"> 20 </span>]
@@ -103,43 +104,43 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr"> 43 </span>
 <span id="L44" class="LineNr"> 44 </span><span class="muScenario">scenario</span> duplex-list-handling [
 <span id="L45" class="LineNr"> 45 </span>  run [
-<span id="L46" class="LineNr"> 46 </span>    <span class="Constant">local-scope</span>
-<span id="L47" class="LineNr"> 47 </span>    <span class="Comment"># reserve locations 0-9 to check for missing null check</span>
-<span id="L48" class="LineNr"> 48 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy<span class="Constant"> 34</span>
-<span id="L49" class="LineNr"> 49 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy<span class="Constant"> 35</span>
-<span id="L50" class="LineNr"> 50 </span>    list:&amp;:duplex-list:char <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L51" class="LineNr"> 51 </span>    list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
-<span id="L52" class="LineNr"> 52 </span>    list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
-<span id="L53" class="LineNr"> 53 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy list
-<span id="L54" class="LineNr"> 54 </span>    20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L55" class="LineNr"> 55 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L56" class="LineNr"> 56 </span>    21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L57" class="LineNr"> 57 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L58" class="LineNr"> 58 </span>    22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L59" class="LineNr"> 59 </span>    30:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L60" class="LineNr"> 60 </span>    31:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first 30:&amp;:duplex-list:char/<span class="Special">raw</span>
-<span id="L61" class="LineNr"> 61 </span>    32:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> 30:&amp;:duplex-list:char/<span class="Special">raw</span>
-<span id="L62" class="LineNr"> 62 </span>    33:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> 30:&amp;:duplex-list:char/<span class="Special">raw</span>
-<span id="L63" class="LineNr"> 63 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L64" class="LineNr"> 64 </span>    40:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L65" class="LineNr"> 65 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L66" class="LineNr"> 66 </span>    41:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L67" class="LineNr"> 67 </span>    50:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Comment"># reserve locations 0-9 to check for missing null check</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy<span class="Constant"> 34</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy<span class="Constant"> 35</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> list:&amp;:duplex-list:char <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy list
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> 20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> 21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> 22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> 30:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> 31:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first 30:&amp;:duplex-list:char/<span class="Special">raw</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> 32:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> 30:&amp;:duplex-list:char/<span class="Special">raw</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> 33:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> 30:&amp;:duplex-list:char/<span class="Special">raw</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> 40:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> 41:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> 50:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
 <span id="L68" class="LineNr"> 68 </span>  ]
 <span id="L69" class="LineNr"> 69 </span>  memory-should-contain [
-<span id="L70" class="LineNr"> 70 </span>   <span class="Constant"> 0</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no modifications to null pointers</span>
-<span id="L71" class="LineNr"> 71 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
-<span id="L72" class="LineNr"> 72 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 35</span>
-<span id="L73" class="LineNr"> 73 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
-<span id="L74" class="LineNr"> 74 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L75" class="LineNr"> 75 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L76" class="LineNr"> 76 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># null</span>
-<span id="L77" class="LineNr"> 77 </span>   <span class="Constant"> 31</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first of null</span>
-<span id="L78" class="LineNr"> 78 </span>   <span class="Constant"> 32</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># next of null</span>
-<span id="L79" class="LineNr"> 79 </span>   <span class="Constant"> 33</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># prev of null</span>
-<span id="L80" class="LineNr"> 80 </span>   <span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># then start scanning prev</span>
-<span id="L81" class="LineNr"> 81 </span>   <span class="Constant"> 41</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
-<span id="L82" class="LineNr"> 82 </span>   <span class="Constant"> 50</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span><span class="Constant"> 0</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no modifications to null pointers</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 35</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># null</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span><span class="Constant"> 31</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first of null</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span><span class="Constant"> 32</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># next of null</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span><span class="Constant"> 33</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># prev of null</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span><span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># then start scanning prev</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span><span class="Constant"> 41</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span><span class="Constant"> 50</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
 <span id="L83" class="LineNr"> 83 </span>  ]
 <span id="L84" class="LineNr"> 84 </span>]
 <span id="L85" class="LineNr"> 85 </span>
@@ -164,34 +165,34 @@ if ('onhashchange' in window) {
 <span id="L104" class="LineNr">104 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L105" class="LineNr">105 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L106" class="LineNr">106 </span>  run [
-<span id="L107" class="LineNr">107 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list  <span class="Comment"># inside list</span>
-<span id="L108" class="LineNr">108 </span>    list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
-<span id="L109" class="LineNr">109 </span>    <span class="Comment"># check structure like before</span>
-<span id="L110" class="LineNr">110 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L111" class="LineNr">111 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L112" class="LineNr">112 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L113" class="LineNr">113 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L114" class="LineNr">114 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L115" class="LineNr">115 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L116" class="LineNr">116 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L117" class="LineNr">117 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L118" class="LineNr">118 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L119" class="LineNr">119 </span>    20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L120" class="LineNr">120 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L121" class="LineNr">121 </span>    21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L122" class="LineNr">122 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L123" class="LineNr">123 </span>    22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L124" class="LineNr">124 </span>    30:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list  <span class="Comment"># inside list</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> 20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> 21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> 22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> 30:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
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-<span id="L127" class="LineNr">127 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
-<span id="L128" class="LineNr">128 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L129" class="LineNr">129 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
-<span id="L130" class="LineNr">130 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L131" class="LineNr">131 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># then prev</span>
-<span id="L132" class="LineNr">132 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L133" class="LineNr">133 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
-<span id="L134" class="LineNr">134 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># then prev</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
 <span id="L135" class="LineNr">135 </span>  ]
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 <span id="L137" class="LineNr">137 </span>
@@ -201,35 +202,35 @@ if ('onhashchange' in window) {
 <span id="L141" class="LineNr">141 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L142" class="LineNr">142 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L143" class="LineNr">143 </span>  run [
-<span id="L144" class="LineNr">144 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list  <span class="Comment"># inside list</span>
-<span id="L145" class="LineNr">145 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2  <span class="Comment"># now at end of list</span>
-<span id="L146" class="LineNr">146 </span>    list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
-<span id="L147" class="LineNr">147 </span>    <span class="Comment"># check structure like before</span>
-<span id="L148" class="LineNr">148 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L149" class="LineNr">149 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L150" class="LineNr">150 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L151" class="LineNr">151 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L152" class="LineNr">152 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L153" class="LineNr">153 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L154" class="LineNr">154 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L155" class="LineNr">155 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L156" class="LineNr">156 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L157" class="LineNr">157 </span>    20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L158" class="LineNr">158 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L159" class="LineNr">159 </span>    21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L160" class="LineNr">160 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L161" class="LineNr">161 </span>    22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L162" class="LineNr">162 </span>    30:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list  <span class="Comment"># inside list</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2  <span class="Comment"># now at end of list</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list2
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> 20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> 21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> 22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> 30:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
 <span id="L163" class="LineNr">163 </span>  ]
 <span id="L164" class="LineNr">164 </span>  memory-should-contain [
-<span id="L165" class="LineNr">165 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
-<span id="L166" class="LineNr">166 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L167" class="LineNr">167 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L168" class="LineNr">168 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
-<span id="L169" class="LineNr">169 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># then prev</span>
-<span id="L170" class="LineNr">170 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L171" class="LineNr">171 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
-<span id="L172" class="LineNr">172 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># then prev</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
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 <span id="L174" class="LineNr">174 </span>]
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@@ -239,33 +240,33 @@ if ('onhashchange' in window) {
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 <span id="L180" class="LineNr">180 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L181" class="LineNr">181 </span>  run [
-<span id="L182" class="LineNr">182 </span>    list <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list
-<span id="L183" class="LineNr">183 </span>    <span class="Comment"># check structure like before</span>
-<span id="L184" class="LineNr">184 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy list
-<span id="L185" class="LineNr">185 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L186" class="LineNr">186 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L187" class="LineNr">187 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L188" class="LineNr">188 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L189" class="LineNr">189 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L190" class="LineNr">190 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L191" class="LineNr">191 </span>    13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L192" class="LineNr">192 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L193" class="LineNr">193 </span>    20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L194" class="LineNr">194 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L195" class="LineNr">195 </span>    21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L196" class="LineNr">196 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L197" class="LineNr">197 </span>    22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L198" class="LineNr">198 </span>    30:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> insert<span class="Constant"> 6</span>, list
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy list
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> 13:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> 20:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> 21:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> 22:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> 30:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
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 <span id="L200" class="LineNr">200 </span>  memory-should-contain [
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-<span id="L203" class="LineNr">203 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L204" class="LineNr">204 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L205" class="LineNr">205 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># then prev</span>
-<span id="L206" class="LineNr">206 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>
-<span id="L207" class="LineNr">207 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
-<span id="L208" class="LineNr">208 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># inserted element</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># then prev</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
 <span id="L209" class="LineNr">209 </span>  ]
 <span id="L210" class="LineNr">210 </span>]
 <span id="L211" class="LineNr">211 </span>
@@ -285,14 +286,14 @@ if ('onhashchange' in window) {
 <span id="L225" class="LineNr">225 </span>  *x <span class="Special">&lt;-</span> put *x, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>,<span class="Constant"> 0</span>
 <span id="L226" class="LineNr">226 </span>  <span class="Comment"># if next-node is not null, set its prev pointer</span>
 <span id="L227" class="LineNr">227 </span>  <span class="Delimiter">{</span>
-<span id="L228" class="LineNr">228 </span>    <span class="muControl">break-unless</span> next-node
-<span id="L229" class="LineNr">229 </span>    *next-node <span class="Special">&lt;-</span> put *next-node, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, prev-node
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> next-node
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> *next-node <span class="Special">&lt;-</span> put *next-node, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, prev-node
 <span id="L230" class="LineNr">230 </span>  <span class="Delimiter">}</span>
 <span id="L231" class="LineNr">231 </span>  <span class="Comment"># if prev-node is not null, set its next pointer and return</span>
 <span id="L232" class="LineNr">232 </span>  <span class="Delimiter">{</span>
-<span id="L233" class="LineNr">233 </span>    <span class="muControl">break-unless</span> prev-node
-<span id="L234" class="LineNr">234 </span>    *prev-node <span class="Special">&lt;-</span> put *prev-node, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, next-node
-<span id="L235" class="LineNr">235 </span>    <span class="muControl">return</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> prev-node
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> *prev-node <span class="Special">&lt;-</span> put *prev-node, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, next-node
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L236" class="LineNr">236 </span>  <span class="Delimiter">}</span>
 <span id="L237" class="LineNr">237 </span>  <span class="Comment"># if prev-node is null, then we removed the head node at 'in'</span>
 <span id="L238" class="LineNr">238 </span>  <span class="Comment"># return the new head rather than the old 'in'</span>
@@ -305,26 +306,26 @@ if ('onhashchange' in window) {
 <span id="L245" class="LineNr">245 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L246" class="LineNr">246 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L247" class="LineNr">247 </span>  run [
-<span id="L248" class="LineNr">248 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list  <span class="Comment"># second element</span>
-<span id="L249" class="LineNr">249 </span>    list <span class="Special">&lt;-</span> remove list2, list
-<span id="L250" class="LineNr">250 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
-<span id="L251" class="LineNr">251 </span>    <span class="Comment"># check structure like before</span>
-<span id="L252" class="LineNr">252 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L253" class="LineNr">253 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L254" class="LineNr">254 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L255" class="LineNr">255 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L256" class="LineNr">256 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L257" class="LineNr">257 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L258" class="LineNr">258 </span>    30:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L259" class="LineNr">259 </span>    40:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list  <span class="Comment"># second element</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list2, list
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> 30:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> 40:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
 <span id="L260" class="LineNr">260 </span>  ]
 <span id="L261" class="LineNr">261 </span>  memory-should-contain [
-<span id="L262" class="LineNr">262 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
-<span id="L263" class="LineNr">263 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
-<span id="L264" class="LineNr">264 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L265" class="LineNr">265 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
-<span id="L266" class="LineNr">266 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># prev of final element</span>
-<span id="L267" class="LineNr">267 </span>   <span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># prev of final element</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span><span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
 <span id="L268" class="LineNr">268 </span>  ]
 <span id="L269" class="LineNr">269 </span>]
 <span id="L270" class="LineNr">270 </span>
@@ -334,23 +335,23 @@ if ('onhashchange' in window) {
 <span id="L274" class="LineNr">274 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L275" class="LineNr">275 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L276" class="LineNr">276 </span>  run [
-<span id="L277" class="LineNr">277 </span>    list <span class="Special">&lt;-</span> remove list, list
-<span id="L278" class="LineNr">278 </span>    <span class="Comment"># check structure like before</span>
-<span id="L279" class="LineNr">279 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy list
-<span id="L280" class="LineNr">280 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L281" class="LineNr">281 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L282" class="LineNr">282 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L283" class="LineNr">283 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L284" class="LineNr">284 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L285" class="LineNr">285 </span>    30:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L286" class="LineNr">286 </span>    40:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list, list
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy list
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> 30:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> 40:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
 <span id="L287" class="LineNr">287 </span>  ]
 <span id="L288" class="LineNr">288 </span>  memory-should-contain [
-<span id="L289" class="LineNr">289 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># scanning next, skipping deleted element</span>
-<span id="L290" class="LineNr">290 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L291" class="LineNr">291 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
-<span id="L292" class="LineNr">292 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># prev of final element</span>
-<span id="L293" class="LineNr">293 </span>   <span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># scanning next, skipping deleted element</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L291" class="LineNr">291 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># prev of final element</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span><span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
 <span id="L294" class="LineNr">294 </span>  ]
 <span id="L295" class="LineNr">295 </span>]
 <span id="L296" class="LineNr">296 </span>
@@ -360,28 +361,28 @@ if ('onhashchange' in window) {
 <span id="L300" class="LineNr">300 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 4</span>, list
 <span id="L301" class="LineNr">301 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 5</span>, list
 <span id="L302" class="LineNr">302 </span>  run [
-<span id="L303" class="LineNr">303 </span>    <span class="Comment"># delete last element</span>
-<span id="L304" class="LineNr">304 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L305" class="LineNr">305 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L306" class="LineNr">306 </span>    list <span class="Special">&lt;-</span> remove list2, list
-<span id="L307" class="LineNr">307 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
-<span id="L308" class="LineNr">308 </span>    <span class="Comment"># check structure like before</span>
-<span id="L309" class="LineNr">309 </span>    list2 <span class="Special">&lt;-</span> copy list
-<span id="L310" class="LineNr">310 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L311" class="LineNr">311 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L312" class="LineNr">312 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L313" class="LineNr">313 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L314" class="LineNr">314 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
-<span id="L315" class="LineNr">315 </span>    30:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
-<span id="L316" class="LineNr">316 </span>    40:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="Comment"># delete last element</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list2, list
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list2,<span class="Constant"> 0</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <span class="Comment"># check structure like before</span>
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> copy list
+<span id="L310" class="LineNr">310 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L36'>prev</a> list2
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> 30:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> first list2
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> 40:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal list, list2
 <span id="L317" class="LineNr">317 </span>  ]
 <span id="L318" class="LineNr">318 </span>  memory-should-contain [
-<span id="L319" class="LineNr">319 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
-<span id="L320" class="LineNr">320 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
-<span id="L321" class="LineNr">321 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
-<span id="L322" class="LineNr">322 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
-<span id="L323" class="LineNr">323 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># prev of final element</span>
-<span id="L324" class="LineNr">324 </span>   <span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># remove returned non-null</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># scanning next, skipping deleted element</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>  <span class="Comment"># prev of final element</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span><span class="Constant"> 40</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># list back at start</span>
 <span id="L325" class="LineNr">325 </span>  ]
 <span id="L326" class="LineNr">326 </span>]
 <span id="L327" class="LineNr">327 </span>
@@ -389,11 +390,11 @@ if ('onhashchange' in window) {
 <span id="L329" class="LineNr">329 </span>  <span class="Constant">local-scope</span>
 <span id="L330" class="LineNr">330 </span>  list:&amp;:duplex-list:char <span class="Special">&lt;-</span> push<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
 <span id="L331" class="LineNr">331 </span>  run [
-<span id="L332" class="LineNr">332 </span>    list <span class="Special">&lt;-</span> remove list, list
-<span id="L333" class="LineNr">333 </span>    1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy list
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> remove list, list
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> 1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy list
 <span id="L334" class="LineNr">334 </span>  ]
 <span id="L335" class="LineNr">335 </span>  memory-should-contain [
-<span id="L336" class="LineNr">336 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># back to an empty list</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># back to an empty list</span>
 <span id="L337" class="LineNr">337 </span>  ]
 <span id="L338" class="LineNr">338 </span>]
 <span id="L339" class="LineNr">339 </span>
@@ -432,24 +433,24 @@ if ('onhashchange' in window) {
 <span id="L372" class="LineNr">372 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 14</span>, list
 <span id="L373" class="LineNr">373 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 13</span>, list
 <span id="L374" class="LineNr">374 </span>  run [
-<span id="L375" class="LineNr">375 </span>    <span class="Comment"># delete 16 onwards</span>
-<span id="L376" class="LineNr">376 </span>    <span class="Comment"># first pointer: to the third element</span>
-<span id="L377" class="LineNr">377 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L378" class="LineNr">378 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L379" class="LineNr">379 </span>    list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L345'>remove-between</a> list2,<span class="Constant"> 0</span>
-<span id="L380" class="LineNr">380 </span>    <span class="Comment"># now check the list</span>
-<span id="L381" class="LineNr">381 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L382" class="LineNr">382 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L383" class="LineNr">383 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L384" class="LineNr">384 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L385" class="LineNr">385 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L386" class="LineNr">386 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span> <span class="Comment"># delete 16 onwards</span>
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> <span class="Comment"># first pointer: to the third element</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L378" class="LineNr">378 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L379" class="LineNr">379 </span>  <span class="Conceal">¦</span> list2 <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L345'>remove-between</a> list2,<span class="Constant"> 0</span>
+<span id="L380" class="LineNr">380 </span>  <span class="Conceal">¦</span> <span class="Comment"># now check the list</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L385" class="LineNr">385 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
 <span id="L387" class="LineNr">387 </span>  ]
 <span id="L388" class="LineNr">388 </span>  memory-should-contain [
-<span id="L389" class="LineNr">389 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
-<span id="L390" class="LineNr">390 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
-<span id="L391" class="LineNr">391 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 15</span>
-<span id="L392" class="LineNr">392 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 15</span>
+<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L393" class="LineNr">393 </span>  ]
 <span id="L394" class="LineNr">394 </span>]
 <span id="L395" class="LineNr">395 </span>
@@ -463,28 +464,28 @@ if ('onhashchange' in window) {
 <span id="L403" class="LineNr">403 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 14</span>, list
 <span id="L404" class="LineNr">404 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 13</span>, list
 <span id="L405" class="LineNr">405 </span>  run [
-<span id="L406" class="LineNr">406 </span>    <span class="Comment"># delete 15, 16 and 17</span>
-<span id="L407" class="LineNr">407 </span>    <span class="Comment"># start pointer: to the second element</span>
-<span id="L408" class="LineNr">408 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L409" class="LineNr">409 </span>    <span class="Comment"># end pointer: to the last (sixth) element</span>
-<span id="L410" class="LineNr">410 </span>    end:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
-<span id="L411" class="LineNr">411 </span>    end <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end
-<span id="L412" class="LineNr">412 </span>    end <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end
-<span id="L413" class="LineNr">413 </span>    end <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end
-<span id="L414" class="LineNr">414 </span>    <a href='065duplex_list.mu.html#L345'>remove-between</a> list2, end
-<span id="L415" class="LineNr">415 </span>    <span class="Comment"># now check the list</span>
-<span id="L416" class="LineNr">416 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L417" class="LineNr">417 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L418" class="LineNr">418 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L419" class="LineNr">419 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L420" class="LineNr">420 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L421" class="LineNr">421 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Comment"># delete 15, 16 and 17</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Comment"># start pointer: to the second element</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <span class="Comment"># end pointer: to the last (sixth) element</span>
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> end:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list2
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end
+<span id="L414" class="LineNr">414 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L345'>remove-between</a> list2, end
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Comment"># now check the list</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L419" class="LineNr">419 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
 <span id="L422" class="LineNr">422 </span>  ]
 <span id="L423" class="LineNr">423 </span>  memory-should-contain [
-<span id="L424" class="LineNr">424 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
-<span id="L425" class="LineNr">425 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
-<span id="L426" class="LineNr">426 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 18</span>
-<span id="L427" class="LineNr">427 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 18</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># no more elements</span>
 <span id="L428" class="LineNr">428 </span>  ]
 <span id="L429" class="LineNr">429 </span>]
 <span id="L430" class="LineNr">430 </span>
@@ -495,23 +496,23 @@ if ('onhashchange' in window) {
 <span id="L435" class="LineNr">435 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 14</span>, list
 <span id="L436" class="LineNr">436 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 13</span>, list
 <span id="L437" class="LineNr">437 </span>  run [
-<span id="L438" class="LineNr">438 </span>    <span class="Comment"># delete between first and second element (i.e. nothing)</span>
-<span id="L439" class="LineNr">439 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L440" class="LineNr">440 </span>    <a href='065duplex_list.mu.html#L345'>remove-between</a> list, list2
-<span id="L441" class="LineNr">441 </span>    <span class="Comment"># now check the list</span>
-<span id="L442" class="LineNr">442 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L443" class="LineNr">443 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L444" class="LineNr">444 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L445" class="LineNr">445 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L446" class="LineNr">446 </span>    12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L447" class="LineNr">447 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span> <span class="Comment"># delete between first and second element (i.e. nothing)</span>
+<span id="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L440" class="LineNr">440 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L345'>remove-between</a> list, list2
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span> <span class="Comment"># now check the list</span>
+<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L444" class="LineNr">444 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> 12:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
 <span id="L448" class="LineNr">448 </span>  ]
 <span id="L449" class="LineNr">449 </span>  <span class="Comment"># no change</span>
 <span id="L450" class="LineNr">450 </span>  memory-should-contain [
-<span id="L451" class="LineNr">451 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
-<span id="L452" class="LineNr">452 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
-<span id="L453" class="LineNr">453 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 15</span>
-<span id="L454" class="LineNr">454 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L451" class="LineNr">451 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 15</span>
+<span id="L454" class="LineNr">454 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L455" class="LineNr">455 </span>  ]
 <span id="L456" class="LineNr">456 </span>]
 <span id="L457" class="LineNr">457 </span>
@@ -525,19 +526,19 @@ if ('onhashchange' in window) {
 <span id="L465" class="LineNr">465 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 14</span>, list
 <span id="L466" class="LineNr">466 </span>  list <span class="Special">&lt;-</span> push<span class="Constant"> 13</span>, list
 <span id="L467" class="LineNr">467 </span>  run [
-<span id="L468" class="LineNr">468 </span>    <span class="Comment"># remove the third element and beyond</span>
-<span id="L469" class="LineNr">469 </span>    list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L470" class="LineNr">470 </span>    <a href='065duplex_list.mu.html#L345'>remove-between</a> list2,<span class="Constant"> 0</span>
-<span id="L471" class="LineNr">471 </span>    <span class="Comment"># now check the list</span>
-<span id="L472" class="LineNr">472 </span>    10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L473" class="LineNr">473 </span>    list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
-<span id="L474" class="LineNr">474 </span>    11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
-<span id="L475" class="LineNr">475 </span>    20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> <span class="Comment"># remove the third element and beyond</span>
+<span id="L469" class="LineNr">469 </span>  <span class="Conceal">¦</span> list2:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L345'>remove-between</a> list2,<span class="Constant"> 0</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span> <span class="Comment"># now check the list</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> 10:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span> list <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> 11:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *list, <span class="Constant">value:offset</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> 20:&amp;:duplex-list:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> list
 <span id="L476" class="LineNr">476 </span>  ]
 <span id="L477" class="LineNr">477 </span>  memory-should-contain [
-<span id="L478" class="LineNr">478 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
-<span id="L479" class="LineNr">479 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
-<span id="L480" class="LineNr">480 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 13</span>
+<span id="L479" class="LineNr">479 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 14</span>
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L481" class="LineNr">481 </span>  ]
 <span id="L482" class="LineNr">482 </span>]
 <span id="L483" class="LineNr">483 </span>
@@ -549,16 +550,16 @@ if ('onhashchange' in window) {
 <span id="L489" class="LineNr">489 </span>  <span class="muControl">return-unless</span> start
 <span id="L490" class="LineNr">490 </span>  end:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> copy start
 <span id="L491" class="LineNr">491 </span>  <span class="Delimiter">{</span>
-<span id="L492" class="LineNr">492 </span>    <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end/insert-range
-<span id="L493" class="LineNr">493 </span>    <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L494" class="LineNr">494 </span>    end <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L495" class="LineNr">495 </span>    <span class="muControl">loop</span>
+<span id="L492" class="LineNr">492 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> end/insert-range
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Delimiter">}</span>
 <span id="L497" class="LineNr">497 </span>  <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> in
 <span id="L498" class="LineNr">498 </span>  *end <span class="Special">&lt;-</span> put *end, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, <a href='065duplex_list.mu.html#L29'>next</a>
 <span id="L499" class="LineNr">499 </span>  <span class="Delimiter">{</span>
-<span id="L500" class="LineNr">500 </span>    <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L501" class="LineNr">501 </span>    *next <span class="Special">&lt;-</span> put *next, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, end
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L501" class="LineNr">501 </span>  <span class="Conceal">¦</span> *next <span class="Special">&lt;-</span> put *next, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, end
 <span id="L502" class="LineNr">502 </span>  <span class="Delimiter">}</span>
 <span id="L503" class="LineNr">503 </span>  *in <span class="Special">&lt;-</span> put *in, <span class="Constant"><a href='065duplex_list.mu.html#L29'>next</a>:offset</span>, start
 <span id="L504" class="LineNr">504 </span>  *start <span class="Special">&lt;-</span> put *start, <span class="Constant"><a href='065duplex_list.mu.html#L36'>prev</a>:offset</span>, in
@@ -578,10 +579,10 @@ if ('onhashchange' in window) {
 <span id="L518" class="LineNr">518 </span>  <span class="Constant">load-ingredients</span>
 <span id="L519" class="LineNr">519 </span>  result <span class="Special">&lt;-</span> copy in
 <span id="L520" class="LineNr">520 </span>  <span class="Delimiter">{</span>
-<span id="L521" class="LineNr">521 </span>    <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> result
-<span id="L522" class="LineNr">522 </span>    <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L523" class="LineNr">523 </span>    result <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
-<span id="L524" class="LineNr">524 </span>    <span class="muControl">loop</span>
+<span id="L521" class="LineNr">521 </span>  <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:_elem <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> result
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> copy <a href='065duplex_list.mu.html#L29'>next</a>
+<span id="L524" class="LineNr">524 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L525" class="LineNr">525 </span>  <span class="Delimiter">}</span>
 <span id="L526" class="LineNr">526 </span>]
 <span id="L527" class="LineNr">527 </span>
@@ -591,17 +592,17 @@ if ('onhashchange' in window) {
 <span id="L531" class="LineNr">531 </span>  <span class="Constant">load-ingredients</span>
 <span id="L532" class="LineNr">532 </span>  $print x, <span class="Constant">[: ]</span>
 <span id="L533" class="LineNr">533 </span>  <span class="Delimiter">{</span>
-<span id="L534" class="LineNr">534 </span>    <span class="muControl">break-unless</span> x
-<span id="L535" class="LineNr">535 </span>    c:_elem <span class="Special">&lt;-</span> get *x, <span class="Constant">value:offset</span>
-<span id="L536" class="LineNr">536 </span>    $print c, <span class="Constant">[ ]</span>
-<span id="L537" class="LineNr">537 </span>    x <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> x
-<span id="L538" class="LineNr">538 </span>    <span class="Delimiter">{</span>
-<span id="L539" class="LineNr">539 </span>      is-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L540" class="LineNr">540 </span>      <span class="muControl">break-unless</span> is-newline?
-<span id="L541" class="LineNr">541 </span>      $print <span class="Constant">10/newline</span>
-<span id="L542" class="LineNr">542 </span>      $print x, <span class="Constant">[: ]</span>
-<span id="L543" class="LineNr">543 </span>    <span class="Delimiter">}</span>
-<span id="L544" class="LineNr">544 </span>    <span class="muControl">loop</span>
+<span id="L534" class="LineNr">534 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> x
+<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span> c:_elem <span class="Special">&lt;-</span> get *x, <span class="Constant">value:offset</span>
+<span id="L536" class="LineNr">536 </span>  <span class="Conceal">¦</span> $print c, <span class="Constant">[ ]</span>
+<span id="L537" class="LineNr">537 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> <a href='065duplex_list.mu.html#L29'>next</a> x
+<span id="L538" class="LineNr">538 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> is-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L540" class="LineNr">540 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-newline?
+<span id="L541" class="LineNr">541 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> $print <span class="Constant">10/newline</span>
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> $print x, <span class="Constant">[: ]</span>
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L544" class="LineNr">544 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L545" class="LineNr">545 </span>  <span class="Delimiter">}</span>
 <span id="L546" class="LineNr">546 </span>  $print <span class="Constant">10/newline</span>, <span class="Constant">[---]</span>, <span class="Constant">10/newline</span>
 <span id="L547" class="LineNr">547 </span>]
diff --git a/html/066stream.mu.html b/html/066stream.mu.html
index 0a073cd1..3a5268c5 100644
--- a/html/066stream.mu.html
+++ b/html/066stream.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -86,9 +87,9 @@ if ('onhashchange' in window) {
 <span id="L27" class="LineNr">27 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L28" class="LineNr">28 </span>  at-end?:bool <span class="Special">&lt;-</span> greater-or-equal idx len
 <span id="L29" class="LineNr">29 </span>  <span class="Delimiter">{</span>
-<span id="L30" class="LineNr">30 </span>    <span class="muControl">break-unless</span> at-end?
-<span id="L31" class="LineNr">31 </span>    empty-result:&amp;:_elem <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>
-<span id="L32" class="LineNr">32 </span>    <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
+<span id="L30" class="LineNr">30 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L31" class="LineNr">31 </span>  <span class="Conceal">¦</span> empty-result:&amp;:_elem <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>
+<span id="L32" class="LineNr">32 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
 <span id="L33" class="LineNr">33 </span>  <span class="Delimiter">}</span>
 <span id="L34" class="LineNr">34 </span>  result <span class="Special">&lt;-</span> index *s, idx
 <span id="L35" class="LineNr">35 </span>  idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
@@ -104,9 +105,9 @@ if ('onhashchange' in window) {
 <span id="L45" class="LineNr">45 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L46" class="LineNr">46 </span>  at-end?:bool <span class="Special">&lt;-</span> greater-or-equal idx len
 <span id="L47" class="LineNr">47 </span>  <span class="Delimiter">{</span>
-<span id="L48" class="LineNr">48 </span>    <span class="muControl">break-unless</span> at-end?
-<span id="L49" class="LineNr">49 </span>    empty-result:&amp;:_elem <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>
-<span id="L50" class="LineNr">50 </span>    <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
+<span id="L48" class="LineNr">48 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L49" class="LineNr">49 </span>  <span class="Conceal">¦</span> empty-result:&amp;:_elem <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
 <span id="L51" class="LineNr">51 </span>  <span class="Delimiter">}</span>
 <span id="L52" class="LineNr">52 </span>  result <span class="Special">&lt;-</span> index *s, idx
 <span id="L53" class="LineNr">53 </span>]
diff --git a/html/068random.mu.html b/html/068random.mu.html
index 1e6c0429..1518a617 100644
--- a/html/068random.mu.html
+++ b/html/068random.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .muControl { color: #c0a020; }
+.Delimiter { color: #800080; }
 .Special { color: #c00000; }
-.Comment { color: #9090ff; }
+.Conceal { color: #4e4e4e; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
 -->
 </style>
 
@@ -61,10 +62,10 @@ if ('onhashchange' in window) {
 <span id="L2" class="LineNr"> 2 </span>  <span class="Constant">local-scope</span>
 <span id="L3" class="LineNr"> 3 </span>  <span class="Constant">load-ingredients</span>
 <span id="L4" class="LineNr"> 4 </span>  <span class="Delimiter">{</span>
-<span id="L5" class="LineNr"> 5 </span>    <span class="muControl">break-if</span> generator
-<span id="L6" class="LineNr"> 6 </span>    <span class="Comment"># generator is 0? use real random-number generator</span>
-<span id="L7" class="LineNr"> 7 </span>    result <span class="Special">&lt;-</span> real-random
-<span id="L8" class="LineNr"> 8 </span>    <span class="muControl">return</span> result, <span class="Constant">0/false</span>
+<span id="L5" class="LineNr"> 5 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> generator
+<span id="L6" class="LineNr"> 6 </span>  <span class="Conceal">¦</span> <span class="Comment"># generator is 0? use real random-number generator</span>
+<span id="L7" class="LineNr"> 7 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> real-random
+<span id="L8" class="LineNr"> 8 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> result, <span class="Constant">0/false</span>
 <span id="L9" class="LineNr"> 9 </span>  <span class="Delimiter">}</span>
 <span id="L10" class="LineNr">10 </span>  result, fail?, generator <span class="Special">&lt;-</span> read generator
 <span id="L11" class="LineNr">11 </span>]
@@ -76,20 +77,20 @@ if ('onhashchange' in window) {
 <span id="L17" class="LineNr">17 </span>  <span class="Comment"># compute result-len, space to allocate in result</span>
 <span id="L18" class="LineNr">18 </span>  result-len:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L19" class="LineNr">19 </span>  <span class="Delimiter">{</span>
-<span id="L20" class="LineNr">20 </span>    _, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L21" class="LineNr">21 </span>    <span class="muControl">break-unless</span> arg-received?
-<span id="L22" class="LineNr">22 </span>    result-len <span class="Special">&lt;-</span> add result-len,<span class="Constant"> 1</span>
-<span id="L23" class="LineNr">23 </span>    <span class="muControl">loop</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Conceal">¦</span> _, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L21" class="LineNr">21 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> arg-received?
+<span id="L22" class="LineNr">22 </span>  <span class="Conceal">¦</span> result-len <span class="Special">&lt;-</span> add result-len,<span class="Constant"> 1</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L24" class="LineNr">24 </span>  <span class="Delimiter">}</span>
 <span id="L25" class="LineNr">25 </span>  <span class="Constant">rewind-ingredients</span>
 <span id="L26" class="LineNr">26 </span>  result-data:&amp;:@:num <span class="Special">&lt;-</span> new <span class="Constant">number:type</span>, result-len
 <span id="L27" class="LineNr">27 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L28" class="LineNr">28 </span>  <span class="Delimiter">{</span>
-<span id="L29" class="LineNr">29 </span>    curr:num, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L30" class="LineNr">30 </span>    <span class="muControl">break-unless</span> arg-received?
-<span id="L31" class="LineNr">31 </span>    *result-data <span class="Special">&lt;-</span> put-index *result-data, idx, curr
-<span id="L32" class="LineNr">32 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
-<span id="L33" class="LineNr">33 </span>    <span class="muControl">loop</span>
+<span id="L29" class="LineNr">29 </span>  <span class="Conceal">¦</span> curr:num, arg-received?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L30" class="LineNr">30 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> arg-received?
+<span id="L31" class="LineNr">31 </span>  <span class="Conceal">¦</span> *result-data <span class="Special">&lt;-</span> put-index *result-data, idx, curr
+<span id="L32" class="LineNr">32 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L33" class="LineNr">33 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L34" class="LineNr">34 </span>  <span class="Delimiter">}</span>
 <span id="L35" class="LineNr">35 </span>  result <span class="Special">&lt;-</span> <a href='066stream.mu.html#L7'>new-stream</a> result-data
 <span id="L36" class="LineNr">36 </span>]
@@ -102,14 +103,14 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr">43 </span>  5:num/<span class="Special">raw</span>, 6:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='068random.mu.html#L1'>random</a> source
 <span id="L44" class="LineNr">44 </span>  7:num/<span class="Special">raw</span>, 8:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='068random.mu.html#L1'>random</a> source
 <span id="L45" class="LineNr">45 </span>  memory-should-contain [
-<span id="L46" class="LineNr">46 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
-<span id="L47" class="LineNr">47 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># everything went well</span>
-<span id="L48" class="LineNr">48 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 35</span>
-<span id="L49" class="LineNr">49 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># everything went well</span>
-<span id="L50" class="LineNr">50 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 37</span>
-<span id="L51" class="LineNr">51 </span>   <span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># everything went well</span>
-<span id="L52" class="LineNr">52 </span>   <span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty result</span>
-<span id="L53" class="LineNr">53 </span>   <span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># end of stream</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
+<span id="L47" class="LineNr">47 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># everything went well</span>
+<span id="L48" class="LineNr">48 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 35</span>
+<span id="L49" class="LineNr">49 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># everything went well</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 37</span>
+<span id="L51" class="LineNr">51 </span>  <span class="Conceal">¦</span><span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># everything went well</span>
+<span id="L52" class="LineNr">52 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty result</span>
+<span id="L53" class="LineNr">53 </span>  <span class="Conceal">¦</span><span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># end of stream</span>
 <span id="L54" class="LineNr">54 </span>  ]
 <span id="L55" class="LineNr">55 </span>]
 <span id="L56" class="LineNr">56 </span>
@@ -128,7 +129,7 @@ if ('onhashchange' in window) {
 <span id="L69" class="LineNr">69 </span>  source:&amp;:stream:num <span class="Special">&lt;-</span> <a href='068random.mu.html#L14'>assume-random-numbers</a><span class="Constant"> 91</span>
 <span id="L70" class="LineNr">70 </span>  1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='068random.mu.html#L57'>random-in-range</a> source,<span class="Constant"> 40</span>,<span class="Constant"> 50</span>
 <span id="L71" class="LineNr">71 </span>  memory-should-contain [
-<span id="L72" class="LineNr">72 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 41</span>
+<span id="L72" class="LineNr">72 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 41</span>
 <span id="L73" class="LineNr">73 </span>  ]
 <span id="L74" class="LineNr">74 </span>]
 </pre>
diff --git a/html/069hash.cc.html b/html/069hash.cc.html
index 1c454bb6..38bfc900 100644
--- a/html/069hash.cc.html
+++ b/html/069hash.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
+.muData { color: #ffff00; }
 .Special { color: #c00000; }
-.Comment { color: #9090ff; }
+.cSpecial { color: #008000; }
 .Delimiter { color: #800080; }
-.LineNr { color: #444444; }
-.Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
-.CommentedCode { color: #6c6c6c; }
 .traceContains { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.LineNr { color: #444444; }
+.Identifier { color: #c0a020; }
 -->
 </style>
 
@@ -78,8 +79,8 @@ if ('onhashchange' in window) {
 <span id="L15" class="LineNr"> 15 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L16" class="LineNr"> 16 </span><span class="Normal">case</span> HASH: <span class="Delimiter">{</span>
 <span id="L17" class="LineNr"> 17 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L18" class="LineNr"> 18 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'hash' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L19" class="LineNr"> 19 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'hash' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L20" class="LineNr"> 20 </span>  <span class="Delimiter">}</span>
 <span id="L21" class="LineNr"> 21 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L22" class="LineNr"> 22 </span><span class="Delimiter">}</span>
@@ -97,17 +98,17 @@ if ('onhashchange' in window) {
 <span id="L34" class="LineNr"> 34 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L35" class="LineNr"> 35 </span>  canonize<span class="Delimiter">(</span>r<span class="Delimiter">);</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='027call_ingredient.cc.html#L174'>is_mu_text</a><span class="Delimiter">(</span>r<span class="Delimiter">))</span>  <span class="Comment">// optimization</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="Identifier">return</span> <a href='069hash.cc.html#L68'>hash_mu_text</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='069hash.cc.html#L68'>hash_mu_text</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L39" class="LineNr"> 39 </span>    <span class="Identifier">return</span> <a href='069hash.cc.html#L56'>hash_mu_address</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='069hash.cc.html#L56'>hash_mu_address</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_scalar<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L41" class="LineNr"> 41 </span>    <span class="Identifier">return</span> <a href='069hash.cc.html#L51'>hash_mu_scalar</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='069hash.cc.html#L51'>hash_mu_scalar</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L42" class="LineNr"> 42 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Identifier">return</span> <a href='069hash.cc.html#L77'>hash_mu_array</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='069hash.cc.html#L77'>hash_mu_array</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_container<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Identifier">return</span> <a href='069hash.cc.html#L91'>hash_mu_container</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='069hash.cc.html#L91'>hash_mu_container</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L46" class="LineNr"> 46 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_exclusive_container<span class="Delimiter">(</span>r<span class="Delimiter">))</span>
-<span id="L47" class="LineNr"> 47 </span>    <span class="Identifier">return</span> <a href='069hash.cc.html#L106'>hash_mu_exclusive_container</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='069hash.cc.html#L106'>hash_mu_exclusive_container</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L48" class="LineNr"> 48 </span>  assert<span class="Delimiter">(</span><span class="Constant">false</span><span class="Delimiter">);</span>
 <span id="L49" class="LineNr"> 49 </span><span class="Delimiter">}</span>
 <span id="L50" class="LineNr"> 50 </span>
@@ -121,8 +122,8 @@ if ('onhashchange' in window) {
 <span id="L58" class="LineNr"> 58 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; r<span class="Delimiter">.</span>value &lt;&lt; <span class="Constant">&quot; is &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> r<span class="Delimiter">.</span>value<span class="Delimiter">))</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L59" class="LineNr"> 59 </span>  r<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> r<span class="Delimiter">.</span>value<span class="Delimiter">));</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>value != <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L61" class="LineNr"> 61 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;skipping refcount at &quot;</span> &lt;&lt; r<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L62" class="LineNr"> 62 </span>    r<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// skip refcount</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;skipping refcount at &quot;</span> &lt;&lt; r<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> r<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// skip refcount</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Delimiter">}</span>
 <span id="L64" class="LineNr"> 64 </span>  drop_from_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Identifier">return</span> <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
@@ -131,7 +132,7 @@ if ('onhashchange' in window) {
 <span id="L68" class="LineNr"> 68 </span><span class="Normal">size_t</span> <a href='069hash.cc.html#L68'>hash_mu_text</a><span class="Delimiter">(</span><span class="Normal">size_t</span> h<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L69" class="LineNr"> 69 </span>  string input = <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> r<span class="Delimiter">.</span>value<span class="Delimiter">));</span>
 <span id="L70" class="LineNr"> 70 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>input<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>    h = <a href='069hash.cc.html#L119'>hash_iter</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> <span class="Normal">static_cast</span>&lt;<span class="Normal">size_t</span>&gt;<span class="Delimiter">(</span>input<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)));</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> h = <a href='069hash.cc.html#L119'>hash_iter</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> <span class="Normal">static_cast</span>&lt;<span class="Normal">size_t</span>&gt;<span class="Delimiter">(</span>input<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)));</span>
 <span id="L72" class="LineNr"> 72 </span><span class="CommentedCode">//?     cerr &lt;&lt; i &lt;&lt; &quot;: &quot; &lt;&lt; h &lt;&lt; '\n';</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Delimiter">}</span>
 <span id="L74" class="LineNr"> 74 </span>  <span class="Identifier">return</span> h<span class="Delimiter">;</span>
@@ -143,9 +144,9 @@ if ('onhashchange' in window) {
 <span id="L80" class="LineNr"> 80 </span>  <span class="Normal">delete</span> elem<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
 <span id="L81" class="LineNr"> 81 </span>  elem<span class="Delimiter">.</span>type = <a href='032array.cc.html#L366'>copy_array_element</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i=<span class="Constant">0</span><span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a> = r<span class="Delimiter">.</span>value+<span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; size<span class="Delimiter">;</span>  ++i<span class="Delimiter">,</span> <a href='043space.cc.html#L76'>address</a> += size_of<span class="Delimiter">(</span>elem<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L83" class="LineNr"> 83 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = elem<span class="Delimiter">;</span>
-<span id="L84" class="LineNr"> 84 </span>    tmp<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">);</span>
-<span id="L85" class="LineNr"> 85 </span>    h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> tmp = elem<span class="Delimiter">;</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> tmp<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">);</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
 <span id="L86" class="LineNr"> 86 </span><span class="CommentedCode">//?     cerr &lt;&lt; i &lt;&lt; &quot; (&quot; &lt;&lt; address &lt;&lt; &quot;): &quot; &lt;&lt; h &lt;&lt; '\n';</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Delimiter">}</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Identifier">return</span> h<span class="Delimiter">;</span>
@@ -156,12 +157,12 @@ if ('onhashchange' in window) {
 <span id="L93" class="LineNr"> 93 </span>  <span class="Normal">int</span> <a href='043space.cc.html#L76'>address</a> = r<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Normal">int</span> offset = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>element<span class="Delimiter">,</span> <span class="Constant">&quot;ignore-for-hash&quot;</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L98" class="LineNr"> 98 </span>    element<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>address+offset<span class="Delimiter">);</span>
-<span id="L99" class="LineNr"> 99 </span>    h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> element<span class="Delimiter">);</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> element = <a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">,</span> i<span class="Delimiter">);</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>element<span class="Delimiter">,</span> <span class="Constant">&quot;ignore-for-hash&quot;</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> element<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>address+offset<span class="Delimiter">);</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> element<span class="Delimiter">);</span>
 <span id="L100" class="LineNr">100 </span><span class="CommentedCode">//?     cerr &lt;&lt; i &lt;&lt; &quot;: &quot; &lt;&lt; h &lt;&lt; '\n';</span>
-<span id="L101" class="LineNr">101 </span>    offset += size_of<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> offset += size_of<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">);</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>  <span class="Identifier">return</span> h<span class="Delimiter">;</span>
 <span id="L104" class="LineNr">104 </span><span class="Delimiter">}</span>
@@ -173,7 +174,7 @@ if ('onhashchange' in window) {
 <span id="L110" class="LineNr">110 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> variant = variant_type<span class="Delimiter">(</span>r<span class="Delimiter">,</span> tag<span class="Delimiter">);</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Comment">// todo: move this error to container definition time</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>variant<span class="Delimiter">,</span> <span class="Constant">&quot;ignore-for-hash&quot;</span><span class="Delimiter">))</span>
-<span id="L113" class="LineNr">113 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;: /ignore-for-hash won't work in exclusive containers</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;: /ignore-for-hash won't work in exclusive containers</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L114" class="LineNr">114 </span>  variant<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>value + <span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L115" class="LineNr">115 </span>  h = <a href='069hash.cc.html#L34'>hash</a><span class="Delimiter">(</span>h<span class="Delimiter">,</span> variant<span class="Delimiter">);</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Identifier">return</span> h<span class="Delimiter">;</span>
@@ -414,12 +415,12 @@ if ('onhashchange' in window) {
 <span id="L351" class="LineNr">351 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L352" class="LineNr">352 </span><span class="Normal">case</span> HASH_OLD: <span class="Delimiter">{</span>
 <span id="L353" class="LineNr">353 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L354" class="LineNr">354 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'hash_old' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L355" class="LineNr">355 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L354" class="LineNr">354 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'hash_old' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L355" class="LineNr">355 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L356" class="LineNr">356 </span>  <span class="Delimiter">}</span>
 <span id="L357" class="LineNr">357 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L358" class="LineNr">358 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'hash_old' currently only supports texts (address array character), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L359" class="LineNr">359 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'hash_old' currently only supports texts (address array character), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L360" class="LineNr">360 </span>  <span class="Delimiter">}</span>
 <span id="L361" class="LineNr">361 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L362" class="LineNr">362 </span><span class="Delimiter">}</span>
@@ -429,13 +430,13 @@ if ('onhashchange' in window) {
 <span id="L366" class="LineNr">366 </span>  <span class="Normal">size_t</span> h = <span class="Constant">0</span> <span class="Delimiter">;</span>
 <span id="L367" class="LineNr">367 </span>
 <span id="L368" class="LineNr">368 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>input<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L369" class="LineNr">369 </span>    h += <span class="Normal">static_cast</span>&lt;<span class="Normal">size_t</span>&gt;<span class="Delimiter">(</span>input<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L370" class="LineNr">370 </span>    h += <span class="Delimiter">(</span>h&lt;&lt;<span class="Constant">10</span><span class="Delimiter">);</span>
-<span id="L371" class="LineNr">371 </span>    h ^= <span class="Delimiter">(</span>h&gt;&gt;<span class="Constant">6</span><span class="Delimiter">);</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> h += <span class="Normal">static_cast</span>&lt;<span class="Normal">size_t</span>&gt;<span class="Delimiter">(</span>input<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> h += <span class="Delimiter">(</span>h&lt;&lt;<span class="Constant">10</span><span class="Delimiter">);</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> h ^= <span class="Delimiter">(</span>h&gt;&gt;<span class="Constant">6</span><span class="Delimiter">);</span>
 <span id="L372" class="LineNr">372 </span>
-<span id="L373" class="LineNr">373 </span>    h += <span class="Delimiter">(</span>h&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
-<span id="L374" class="LineNr">374 </span>    h ^= <span class="Delimiter">(</span>h&gt;&gt;<span class="Constant">11</span><span class="Delimiter">);</span>
-<span id="L375" class="LineNr">375 </span>    h += <span class="Delimiter">(</span>h&lt;&lt;<span class="Constant">15</span><span class="Delimiter">);</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> h += <span class="Delimiter">(</span>h&lt;&lt;<span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span> h ^= <span class="Delimiter">(</span>h&gt;&gt;<span class="Constant">11</span><span class="Delimiter">);</span>
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span> h += <span class="Delimiter">(</span>h&lt;&lt;<span class="Constant">15</span><span class="Delimiter">);</span>
 <span id="L376" class="LineNr">376 </span>  <span class="Delimiter">}</span>
 <span id="L377" class="LineNr">377 </span>
 <span id="L378" class="LineNr">378 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
diff --git a/html/070table.mu.html b/html/070table.mu.html
index 786f72be..8733c855 100644
--- a/html/070table.mu.html
+++ b/html/070table.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -67,12 +68,12 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr">  7 </span>  <span class="Constant">local-scope</span>
 <span id="L8" class="LineNr">  8 </span>  tab:&amp;:table:num:num <span class="Special">&lt;-</span> <a href='070table.mu.html#L56'>new-table</a><span class="Constant"> 30</span>
 <span id="L9" class="LineNr">  9 </span>  run [
-<span id="L10" class="LineNr"> 10 </span>    put-index tab,<span class="Constant"> 12</span>,<span class="Constant"> 34</span>
-<span id="L11" class="LineNr"> 11 </span>    60:num/<span class="Special">raw</span>, 61:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab,<span class="Constant"> 12</span>
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> put-index tab,<span class="Constant"> 12</span>,<span class="Constant"> 34</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Conceal">¦</span> 60:num/<span class="Special">raw</span>, 61:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab,<span class="Constant"> 12</span>
 <span id="L12" class="LineNr"> 12 </span>  ]
 <span id="L13" class="LineNr"> 13 </span>  memory-should-contain [
-<span id="L14" class="LineNr"> 14 </span>   <span class="Constant"> 60</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
-<span id="L15" class="LineNr"> 15 </span>   <span class="Constant"> 61</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># found</span>
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span><span class="Constant"> 60</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span><span class="Constant"> 61</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># found</span>
 <span id="L16" class="LineNr"> 16 </span>  ]
 <span id="L17" class="LineNr"> 17 </span>]
 <span id="L18" class="LineNr"> 18 </span>
@@ -80,12 +81,12 @@ if ('onhashchange' in window) {
 <span id="L20" class="LineNr"> 20 </span>  <span class="Constant">local-scope</span>
 <span id="L21" class="LineNr"> 21 </span>  tab:&amp;:table:text:num <span class="Special">&lt;-</span> <a href='070table.mu.html#L56'>new-table</a><span class="Constant"> 30</span>
 <span id="L22" class="LineNr"> 22 </span>  run [
-<span id="L23" class="LineNr"> 23 </span>    put-index tab, <span class="Constant">[abc def]</span>,<span class="Constant"> 34</span>
-<span id="L24" class="LineNr"> 24 </span>    1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab, <span class="Constant">[abc def]</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> put-index tab, <span class="Constant">[abc def]</span>,<span class="Constant"> 34</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> 1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab, <span class="Constant">[abc def]</span>
 <span id="L25" class="LineNr"> 25 </span>  ]
 <span id="L26" class="LineNr"> 26 </span>  memory-should-contain [
-<span id="L27" class="LineNr"> 27 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
-<span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># found</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># found</span>
 <span id="L29" class="LineNr"> 29 </span>  ]
 <span id="L30" class="LineNr"> 30 </span>]
 <span id="L31" class="LineNr"> 31 </span>
@@ -93,11 +94,11 @@ if ('onhashchange' in window) {
 <span id="L33" class="LineNr"> 33 </span>  <span class="Constant">local-scope</span>
 <span id="L34" class="LineNr"> 34 </span>  tab:&amp;:table:text:num <span class="Special">&lt;-</span> <a href='070table.mu.html#L56'>new-table</a><span class="Constant"> 30</span>
 <span id="L35" class="LineNr"> 35 </span>  run [
-<span id="L36" class="LineNr"> 36 </span>    1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab, <span class="Constant">[abc def]</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> 1:num/<span class="Special">raw</span>, 2:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> index tab, <span class="Constant">[abc def]</span>
 <span id="L37" class="LineNr"> 37 </span>  ]
 <span id="L38" class="LineNr"> 38 </span>  memory-should-contain [
-<span id="L39" class="LineNr"> 39 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L40" class="LineNr"> 40 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># not found</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># not found</span>
 <span id="L41" class="LineNr"> 41 </span>  ]
 <span id="L42" class="LineNr"> 42 </span>]
 <span id="L43" class="LineNr"> 43 </span>
diff --git a/html/071recipe.cc.html b/html/071recipe.cc.html
index 93055af1..91074b81 100644
--- a/html/071recipe.cc.html
+++ b/html/071recipe.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.SalientComment { color: #00ffff; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
-.SalientComment { color: #00ffff; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -110,8 +111,8 @@ if ('onhashchange' in window) {
 <span id="L48" class="LineNr"> 48 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>x<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L50" class="LineNr"> 50 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L60'>contains_reagent_with_type</a><span class="Delimiter">(</span>caller<span class="Delimiter">,</span> x<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L51" class="LineNr"> 51 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;you can't use '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' as a recipe literal when it's also a variable</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L52" class="LineNr"> 52 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;you can't use '&quot;</span> &lt;&lt; x<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;' as a recipe literal when it's also a variable</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L53" class="LineNr"> 53 </span>  <span class="Delimiter">}</span>
 <span id="L54" class="LineNr"> 54 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L55" class="LineNr"> 55 </span><span class="Delimiter">}</span>
@@ -121,11 +122,11 @@ if ('onhashchange' in window) {
 <span id="L59" class="LineNr"> 59 </span><span class="Delimiter">}</span>
 <span id="L60" class="LineNr"> 60 </span><span class="Normal">bool</span> <a href='071recipe.cc.html#L60'>contains_reagent_with_type</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>    <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L64" class="LineNr"> 64 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L70'>is_matching_non_recipe_literal</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L65" class="LineNr"> 65 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
-<span id="L66" class="LineNr"> 66 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L70'>is_matching_non_recipe_literal</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L70'>is_matching_non_recipe_literal</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L70'>is_matching_non_recipe_literal</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> name<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L67" class="LineNr"> 67 </span>  <span class="Delimiter">}</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L69" class="LineNr"> 69 </span><span class="Delimiter">}</span>
@@ -155,12 +156,12 @@ if ('onhashchange' in window) {
 <span id="L93" class="LineNr"> 93 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L94" class="LineNr"> 94 </span><span class="Normal">case</span> CALL: <span class="Delimiter">{</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'call' requires at least one ingredient (the <a href='010vm.cc.html#L19'>recipe</a> to call)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'call' requires at least one ingredient (the <a href='010vm.cc.html#L19'>recipe</a> to call)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L98" class="LineNr"> 98 </span>  <span class="Delimiter">}</span>
 <span id="L99" class="LineNr"> 99 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_recipe<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L100" class="LineNr">100 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'call' should be a <a href='010vm.cc.html#L19'>recipe</a>, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'call' should be a <a href='010vm.cc.html#L19'>recipe</a>, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L104" class="LineNr">104 </span><span class="Delimiter">}</span>
@@ -168,13 +169,13 @@ if ('onhashchange' in window) {
 <span id="L106" class="LineNr">106 </span><span class="Normal">case</span> CALL: <span class="Delimiter">{</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Comment">// Begin Call</span>
 <span id="L108" class="LineNr">108 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L109" class="LineNr">109 </span>    ++Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
-<span id="L110" class="LineNr">110 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;indirect 'call': incrementing callstack depth to &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L111" class="LineNr">111 </span>    assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> ++Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;indirect 'call': incrementing callstack depth to &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Delimiter">}</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr">114 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to call empty <a href='010vm.cc.html#L19'>recipe</a> in '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to call empty <a href='010vm.cc.html#L19'>recipe</a> in '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Delimiter">}</span>
 <span id="L117" class="LineNr">117 </span>  <a href='010vm.cc.html#L32'>instruction</a><span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> call_instruction = current_instruction<span class="Delimiter">();</span>
 <span id="L118" class="LineNr">118 </span>  call_instruction<span class="Delimiter">.</span>operation = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -221,26 +222,26 @@ if ('onhashchange' in window) {
 <span id="L159" class="LineNr">159 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- type-check 'call' instructions inside <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
 <span id="L161" class="LineNr">161 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L162" class="LineNr">162 </span>    <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L163" class="LineNr">163 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_indirect_call<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L164" class="LineNr">164 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error raised above</span>
-<span id="L165" class="LineNr">165 </span>    <span class="Normal">const</span> reagent&amp; callee = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_recipe<span class="Delimiter">(</span>callee<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error raised above</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Normal">const</span> <a href='010vm.cc.html#L19'>recipe</a> callee_header = is_literal<span class="Delimiter">(</span>callee<span class="Delimiter">)</span> ? get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>value<span class="Delimiter">)</span> : <a href='071recipe.cc.html#L200'>from_reagent</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
-<span id="L168" class="LineNr">168 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!callee_header<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L169" class="LineNr">169 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L189'>is_indirect_call_with_ingredients</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L171" class="LineNr">171 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L172" class="LineNr">172 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient &quot;</span> &lt;&lt; i-<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span> &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L173" class="LineNr">173 </span>      <span class="Delimiter">}</span>
-<span id="L174" class="LineNr">174 </span>    <span class="Delimiter">}</span>
-<span id="L175" class="LineNr">175 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L194'>is_indirect_call_with_products</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L176" class="LineNr">176 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L177" class="LineNr">177 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L178" class="LineNr">178 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L179" class="LineNr">179 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L180" class="LineNr">180 </span>      <span class="Delimiter">}</span>
-<span id="L181" class="LineNr">181 </span>    <span class="Delimiter">}</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_indirect_call<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error raised above</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; callee = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_recipe<span class="Delimiter">(</span>callee<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error raised above</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> <a href='010vm.cc.html#L19'>recipe</a> callee_header = is_literal<span class="Delimiter">(</span>callee<span class="Delimiter">)</span> ? get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> callee<span class="Delimiter">.</span>value<span class="Delimiter">)</span> : <a href='071recipe.cc.html#L200'>from_reagent</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!callee_header<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L189'>is_indirect_call_with_ingredients</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>+<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i-<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;ingredient &quot;</span> &lt;&lt; i-<span class="Comment">/*</span><span class="Comment">skip callee</span><span class="Comment">*/</span><span class="Constant">1</span> &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L194'>is_indirect_call_with_products</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>callee_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot; has the wrong type at '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Delimiter">}</span>
 <span id="L183" class="LineNr">183 </span><span class="Delimiter">}</span>
 <span id="L184" class="LineNr">184 </span>
@@ -264,31 +265,31 @@ if ('onhashchange' in window) {
 <span id="L202" class="LineNr">202 </span>  <a href='010vm.cc.html#L19'>recipe</a> result_header<span class="Delimiter">;</span>  <span class="Comment">// will contain only ingredients and products, nothing else</span>
 <span id="L203" class="LineNr">203 </span>  result_header<span class="Delimiter">.</span>has_header = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L205" class="LineNr">205 </span>    assert<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;recipe&quot;</span><span class="Delimiter">);</span>
-<span id="L206" class="LineNr">206 </span>    <span class="Identifier">return</span> result_header<span class="Delimiter">;</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;recipe&quot;</span><span class="Delimiter">);</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result_header<span class="Delimiter">;</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Delimiter">}</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Normal">const</span> type_tree* root_type = r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? r<span class="Delimiter">.</span>type : r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L209" class="LineNr">209 </span>  assert<span class="Delimiter">(</span>root_type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
 <span id="L210" class="LineNr">210 </span>  assert<span class="Delimiter">(</span>root_type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;recipe&quot;</span><span class="Delimiter">);</span>
 <span id="L211" class="LineNr">211 </span>  <span class="Normal">const</span> type_tree* curr = r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>
 <span id="L212" class="LineNr">212 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">nada</span><span class="Comment">*/</span><span class="Delimiter">;</span>  curr &amp;&amp; !curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">;</span>  curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L213" class="LineNr">213 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L214" class="LineNr">214 </span>      curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>  <span class="Comment">// skip delimiter</span>
-<span id="L215" class="LineNr">215 </span>      <span class="Identifier">goto</span> read_products<span class="Delimiter">;</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Delimiter">}</span>
-<span id="L217" class="LineNr">217 </span>    result_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">));</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom &amp;&amp; curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;-&gt;&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">;</span>  <span class="Comment">// skip delimiter</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> read_products<span class="Delimiter">;</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> result_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">));</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Delimiter">}</span>
 <span id="L219" class="LineNr">219 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L220" class="LineNr">220 </span>    assert<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
-<span id="L221" class="LineNr">221 </span>    result_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">));</span>
-<span id="L222" class="LineNr">222 </span>    <span class="Identifier">return</span> result_header<span class="Delimiter">;</span>  <span class="Comment">// no products</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span> result_header<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">));</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result_header<span class="Delimiter">;</span>  <span class="Comment">// no products</span>
 <span id="L223" class="LineNr">223 </span>  <span class="Delimiter">}</span>
 <span id="L224" class="LineNr">224 </span>  <span class="Normal">read_products</span>:
 <span id="L225" class="LineNr">225 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">nada</span><span class="Comment">*/</span><span class="Delimiter">;</span>  curr &amp;&amp; !curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">;</span>  curr = curr<span class="Delimiter">-&gt;</span>right<span class="Delimiter">)</span>
-<span id="L226" class="LineNr">226 </span>    result_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">));</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> result_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>left<span class="Delimiter">));</span>
 <span id="L227" class="LineNr">227 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L228" class="LineNr">228 </span>    assert<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
-<span id="L229" class="LineNr">229 </span>    result_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">));</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">);</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> result_header<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='071recipe.cc.html#L261'>next_recipe_reagent</a><span class="Delimiter">(</span>curr<span class="Delimiter">));</span>
 <span id="L230" class="LineNr">230 </span>  <span class="Delimiter">}</span>
 <span id="L231" class="LineNr">231 </span>  <span class="Identifier">return</span> result_header<span class="Delimiter">;</span>
 <span id="L232" class="LineNr">232 </span><span class="Delimiter">}</span>
@@ -331,7 +332,7 @@ if ('onhashchange' in window) {
 <span id="L269" class="LineNr">269 </span><span class="Normal">bool</span> <a href='071recipe.cc.html#L269'>is_mu_recipe</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L270" class="LineNr">270 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L271" class="LineNr">271 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L272" class="LineNr">272 </span>    <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;recipe-literal&quot;</span><span class="Delimiter">;</span>
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;recipe-literal&quot;</span><span class="Delimiter">;</span>
 <span id="L273" class="LineNr">273 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;recipe&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
@@ -366,18 +367,18 @@ if ('onhashchange' in window) {
 <span id="L304" class="LineNr">304 </span><span class="Delimiter">:(before &quot;End Matching Types For Literal(to)&quot;)</span>
 <span id="L305" class="LineNr">305 </span><span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L269'>is_mu_recipe</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Delimiter">{</span>
 <span id="L306" class="LineNr">306 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> from<span class="Delimiter">.</span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L307" class="LineNr">307 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;trying to store <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; from<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; into &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>to<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but there's no such recipe</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L308" class="LineNr">308 </span>    <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;trying to store <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; from<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; into &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>to<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but there's no such recipe</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L309" class="LineNr">309 </span>  <span class="Delimiter">}</span>
 <span id="L310" class="LineNr">310 </span>  <span class="Normal">const</span> recipe&amp; rrhs = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> from<span class="Delimiter">.</span>value<span class="Delimiter">);</span>
 <span id="L311" class="LineNr">311 </span>  <span class="Normal">const</span> recipe&amp; rlhs = <a href='071recipe.cc.html#L200'>from_reagent</a><span class="Delimiter">(</span>to<span class="Delimiter">);</span>
 <span id="L312" class="LineNr">312 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>rrhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L313" class="LineNr">313 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> rrhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L314" class="LineNr">314 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> rrhs<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Delimiter">}</span>
 <span id="L316" class="LineNr">316 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; min<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>products<span class="Delimiter">),</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>rrhs<span class="Delimiter">.</span>products<span class="Delimiter">));</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L317" class="LineNr">317 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> rrhs<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
-<span id="L318" class="LineNr">318 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>rlhs<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> rrhs<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L319" class="LineNr">319 </span>  <span class="Delimiter">}</span>
 <span id="L320" class="LineNr">320 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L321" class="LineNr">321 </span><span class="Delimiter">}</span>
@@ -404,7 +405,7 @@ if ('onhashchange' in window) {
 <span id="L342" class="LineNr">342 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L343" class="LineNr">343 </span>  local-scope
 <span id="L344" class="LineNr">344 </span>  <span class="Delimiter">{</span>
-<span id="L345" class="LineNr">345 </span>    <span class="Identifier">break</span>-<span class="Normal">if</span> foo
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span>-<span class="Normal">if</span> foo
 <span id="L346" class="LineNr">346 </span>  <span class="Delimiter">}</span>
 <span id="L347" class="LineNr">347 </span>]
 <span id="L348" class="LineNr">348 </span><span class="Comment"># error should be as if foo is not a recipe</span>
@@ -417,11 +418,11 @@ if ('onhashchange' in window) {
 <span id="L355" class="LineNr">355 </span><span class="Delimiter">:(code)</span>
 <span id="L356" class="LineNr">356 </span><span class="Normal">void</span> <a href='071recipe.cc.html#L356'>check_for_recipe_literals</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L357" class="LineNr">357 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L358" class="LineNr">358 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L269'>is_mu_recipe</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L359" class="LineNr">359 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;missing type for '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L360" class="LineNr">360 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span>
-<span id="L361" class="LineNr">361 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  did you forget 'load-ingredients'?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L362" class="LineNr">362 </span>    <span class="Delimiter">}</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='071recipe.cc.html#L269'>is_mu_recipe</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;missing type for '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;' in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_present_in_ingredients<span class="Delimiter">(</span>caller<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name<span class="Delimiter">))</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  did you forget 'load-ingredients'?</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L363" class="LineNr">363 </span>  <span class="Delimiter">}</span>
 <span id="L364" class="LineNr">364 </span><span class="Delimiter">}</span>
 <span id="L365" class="LineNr">365 </span>
diff --git a/html/072scheduler.cc.html b/html/072scheduler.cc.html
index 37bc5fc4..378ed639 100644
--- a/html/072scheduler.cc.html
+++ b/html/072scheduler.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
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-.traceAbsent { color: #c00000; }
-.Special { color: #c00000; }
-.muRecipe { color: #ff8700; }
 .SalientComment { color: #00ffff; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muRecipe { color: #ff8700; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.traceAbsent { color: #c00000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.Identifier { color: #c0a020; }
 .cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
+.Identifier { color: #c0a020; }
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 </style>
 
@@ -69,7 +70,7 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr">  6 </span>  start-running f2
 <span id="L7" class="LineNr">  7 </span>  <span class="Comment"># wait for f2 to run</span>
 <span id="L8" class="LineNr">  8 </span>  <span class="Delimiter">{</span>
-<span id="L9" class="LineNr">  9 </span>    jump-unless <span class="Constant">1</span>:num<span class="Delimiter">,</span> -<span class="Constant">1</span>
+<span id="L9" class="LineNr">  9 </span>  <span class="Conceal">¦</span> jump-unless <span class="Constant">1</span>:num<span class="Delimiter">,</span> -<span class="Constant">1</span>
 <span id="L10" class="LineNr"> 10 </span>  <span class="Delimiter">}</span>
 <span id="L11" class="LineNr"> 11 </span>]
 <span id="L12" class="LineNr"> 12 </span><span class="muRecipe">def</span> f2 [
@@ -91,7 +92,7 @@ if ('onhashchange' in window) {
 <span id="L28" class="LineNr"> 28 </span><span class="Normal">bool</span> <a href='072scheduler.cc.html#L28'>should_continue_running</a><span class="Delimiter">(</span><span class="Normal">const</span> routine* current_routine<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L29" class="LineNr"> 29 </span>  assert<span class="Delimiter">(</span>current_routine == Current_routine<span class="Delimiter">);</span>  <span class="Comment">// argument passed in just to make caller readable above</span>
 <span id="L30" class="LineNr"> 30 </span>  <span class="Identifier">return</span> Current_routine<span class="Delimiter">-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a>
-<span id="L31" class="LineNr"> 31 </span>      &amp;&amp; Current_routine<span class="Delimiter">-&gt;</span>instructions_run_this_scheduling_slice &lt; Scheduling_interval<span class="Delimiter">;</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> &amp;&amp; Current_routine<span class="Delimiter">-&gt;</span>instructions_run_this_scheduling_slice &lt; Scheduling_interval<span class="Delimiter">;</span>
 <span id="L32" class="LineNr"> 32 </span><span class="Delimiter">}</span>
 <span id="L33" class="LineNr"> 33 </span><span class="Delimiter">:(after &quot;stop_running_current_routine:&quot;)</span>
 <span id="L34" class="LineNr"> 34 </span><span class="Comment">// Reset instructions_run_this_scheduling_slice</span>
@@ -126,26 +127,26 @@ if ('onhashchange' in window) {
 <span id="L63" class="LineNr"> 63 </span>  Routines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>rr<span class="Delimiter">);</span>
 <span id="L64" class="LineNr"> 64 </span>  Current_routine_index = <span class="Constant">0</span><span class="Delimiter">,</span> Current_routine = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>!all_routines_done<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>    <a href='072scheduler.cc.html#L91'>skip_to_next_routine</a><span class="Delimiter">();</span>
-<span id="L67" class="LineNr"> 67 </span>    assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">);</span>
-<span id="L68" class="LineNr"> 68 </span>    assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">);</span>
-<span id="L69" class="LineNr"> 69 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='072scheduler.cc.html#L103'>current_routine_label</a><span class="Delimiter">()</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>    run_current_routine<span class="Delimiter">();</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Comment">// Scheduler State Transitions</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>completed<span class="Delimiter">())</span>
-<span id="L73" class="LineNr"> 73 </span>      Current_routine<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
-<span id="L74" class="LineNr"> 74 </span>    <span class="Comment">// End Scheduler State Transitions</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <a href='072scheduler.cc.html#L91'>skip_to_next_routine</a><span class="Delimiter">();</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">);</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">);</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9990</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <a href='072scheduler.cc.html#L103'>current_routine_label</a><span class="Delimiter">()</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> run_current_routine<span class="Delimiter">();</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Comment">// Scheduler State Transitions</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>completed<span class="Delimiter">())</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Scheduler State Transitions</span>
 <span id="L75" class="LineNr"> 75 </span>
-<span id="L76" class="LineNr"> 76 </span>    <span class="Comment">// Scheduler Cleanup</span>
-<span id="L77" class="LineNr"> 77 </span>    <span class="Comment">// End Scheduler Cleanup</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Comment">// Scheduler Cleanup</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Scheduler Cleanup</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">}</span>
 <span id="L79" class="LineNr"> 79 </span>  <span class="Comment">// End Run Routine</span>
 <span id="L80" class="LineNr"> 80 </span><span class="Delimiter">}</span>
 <span id="L81" class="LineNr"> 81 </span>
 <span id="L82" class="LineNr"> 82 </span><span class="Normal">bool</span> <a href='072scheduler.cc.html#L82'>all_routines_done</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L84" class="LineNr"> 84 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">)</span>
-<span id="L85" class="LineNr"> 85 </span>      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">)</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Delimiter">}</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L88" class="LineNr"> 88 </span><span class="Delimiter">}</span>
@@ -155,11 +156,11 @@ if ('onhashchange' in window) {
 <span id="L92" class="LineNr"> 92 </span>  assert<span class="Delimiter">(</span>!Routines<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
 <span id="L93" class="LineNr"> 93 </span>  assert<span class="Delimiter">(</span>Current_routine_index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">));</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Delimiter">(</span>Current_routine_index+<span class="Constant">1</span><span class="Delimiter">)</span>%SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  i != Current_routine_index<span class="Delimiter">;</span>  i = <span class="Delimiter">(</span>i+<span class="Constant">1</span><span class="Delimiter">)</span>%SIZE<span class="Delimiter">(</span>Routines<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>      Current_routine_index = i<span class="Delimiter">;</span>
-<span id="L97" class="LineNr"> 97 </span>      Current_routine = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L98" class="LineNr"> 98 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="Delimiter">}</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Current_routine_index = i<span class="Delimiter">;</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Current_routine = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L100" class="LineNr">100 </span>  <span class="Delimiter">}</span>
 <span id="L101" class="LineNr">101 </span><span class="Delimiter">}</span>
 <span id="L102" class="LineNr">102 </span>
@@ -171,8 +172,8 @@ if ('onhashchange' in window) {
 <span id="L108" class="LineNr">108 </span>  ostringstream result<span class="Delimiter">;</span>
 <span id="L109" class="LineNr">109 </span>  <span class="Normal">const</span> call_stack&amp; calls = r<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">;</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>call_stack::const_iterator p = calls<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != calls<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L111" class="LineNr">111 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p != calls<span class="Delimiter">.</span>begin<span class="Delimiter">())</span> result &lt;&lt; <span class="Constant">'/'</span><span class="Delimiter">;</span>
-<span id="L112" class="LineNr">112 </span>    result &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p != calls<span class="Delimiter">.</span>begin<span class="Delimiter">())</span> result &lt;&lt; <span class="Constant">'/'</span><span class="Delimiter">;</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> result &lt;&lt; get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">).</span>name<span class="Delimiter">;</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Delimiter">}</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L115" class="LineNr">115 </span><span class="Delimiter">}</span>
@@ -193,11 +194,11 @@ if ('onhashchange' in window) {
 <span id="L130" class="LineNr">130 </span>  <span class="Comment">// todo: test this</span>
 <span id="L131" class="LineNr">131 </span>  Current_routine = main_routine<span class="Delimiter">;</span>
 <span id="L132" class="LineNr">132 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; argc<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L133" class="LineNr">133 </span>    vector&lt;<span class="Normal">double</span>&gt; arg<span class="Delimiter">;</span>
-<span id="L134" class="LineNr">134 </span>    arg<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>argv[i]<span class="Delimiter">));</span>
-<span id="L135" class="LineNr">135 </span>    assert<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> arg<span class="Delimiter">.</span>back<span class="Delimiter">())</span> == <span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L136" class="LineNr">136 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> arg<span class="Delimiter">.</span>back<span class="Delimiter">(),</span> <span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// update refcount</span>
-<span id="L137" class="LineNr">137 </span>    current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>arg<span class="Delimiter">);</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> vector&lt;<span class="Normal">double</span>&gt; arg<span class="Delimiter">;</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> arg<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>argv[i]<span class="Delimiter">));</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> arg<span class="Delimiter">.</span>back<span class="Delimiter">())</span> == <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> arg<span class="Delimiter">.</span>back<span class="Delimiter">(),</span> <span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// update refcount</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> current_call<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>arg<span class="Delimiter">);</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Delimiter">}</span>
 <span id="L139" class="LineNr">139 </span>  run<span class="Delimiter">(</span>main_routine<span class="Delimiter">);</span>
 <span id="L140" class="LineNr">140 </span><span class="Delimiter">}</span>
@@ -230,12 +231,12 @@ if ('onhashchange' in window) {
 <span id="L167" class="LineNr">167 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L168" class="LineNr">168 </span><span class="Normal">case</span> START_RUNNING: <span class="Delimiter">{</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'start-running' requires at least one ingredient: the <a href='010vm.cc.html#L19'>recipe</a> to start running</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L171" class="LineNr">171 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'start-running' requires at least one ingredient: the <a href='010vm.cc.html#L19'>recipe</a> to start running</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Delimiter">}</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_recipe<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L174" class="LineNr">174 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'start-running' should be a <a href='010vm.cc.html#L19'>recipe</a>, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L175" class="LineNr">175 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'start-running' should be a <a href='010vm.cc.html#L19'>recipe</a>, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Delimiter">}</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L178" class="LineNr">178 </span><span class="Delimiter">}</span>
@@ -245,11 +246,11 @@ if ('onhashchange' in window) {
 <span id="L182" class="LineNr">182 </span>  new_routine<span class="Delimiter">-&gt;</span>parent_index = Current_routine_index<span class="Delimiter">;</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Comment">// populate ingredients</span>
 <span id="L184" class="LineNr">184 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L185" class="LineNr">185 </span>    new_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
-<span id="L186" class="LineNr">186 </span>    reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L187" class="LineNr">187 </span>    canonize_type<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
-<span id="L188" class="LineNr">188 </span>    new_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
-<span id="L189" class="LineNr">189 </span>    <span class="Comment">// End Populate start-running Ingredient</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> new_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> ingredient = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> canonize_type<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> new_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>ingredient<span class="Delimiter">);</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Populate start-running Ingredient</span>
 <span id="L190" class="LineNr">190 </span>  <span class="Delimiter">}</span>
 <span id="L191" class="LineNr">191 </span>  Routines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new_routine<span class="Delimiter">);</span>
 <span id="L192" class="LineNr">192 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
@@ -295,7 +296,7 @@ if ('onhashchange' in window) {
 <span id="L232" class="LineNr">232 </span>  start-running f2<span class="Delimiter">,</span> <span class="Constant">3</span>
 <span id="L233" class="LineNr">233 </span>  <span class="Comment"># wait for f2 to run</span>
 <span id="L234" class="LineNr">234 </span>  <span class="Delimiter">{</span>
-<span id="L235" class="LineNr">235 </span>    jump-unless <span class="Constant">1</span>:num<span class="Delimiter">,</span> -<span class="Constant">1</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> jump-unless <span class="Constant">1</span>:num<span class="Delimiter">,</span> -<span class="Constant">1</span>
 <span id="L236" class="LineNr">236 </span>  <span class="Delimiter">}</span>
 <span id="L237" class="LineNr">237 </span>]
 <span id="L238" class="LineNr">238 </span><span class="muRecipe">def</span> f2 [
@@ -463,7 +464,7 @@ if ('onhashchange' in window) {
 <span id="L400" class="LineNr">400 </span>
 <span id="L401" class="LineNr">401 </span><span class="Delimiter">:(after &quot;operator&lt;&lt;(ostream&amp; os, <a href='001help.cc.html#L255'>unused</a> end)&quot;)</span>
 <span id="L402" class="LineNr">402 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream &amp;&amp; Trace_stream<span class="Delimiter">-&gt;</span>curr_label == <span class="Constant">&quot;error&quot;</span> &amp;&amp; Current_routine<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L403" class="LineNr">403 </span>    Current_routine<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
+<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
 <span id="L404" class="LineNr">404 </span>  <span class="Delimiter">}</span>
 <span id="L405" class="LineNr">405 </span>
 <span id="L406" class="LineNr">406 </span><span class="SalientComment">//:: Routines are marked completed when their parent completes.</span>
@@ -484,15 +485,15 @@ if ('onhashchange' in window) {
 <span id="L421" class="LineNr">421 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>parent_index &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// root thread</span>
 <span id="L422" class="LineNr">422 </span>  <span class="Comment">// structured concurrency: <a href="http://250bpm.com/blog:71">http://250bpm.com/blog:71</a></span>
 <span id="L423" class="LineNr">423 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>has_completed_parent<span class="Delimiter">(</span>i<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L424" class="LineNr">424 </span>    Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
 <span id="L425" class="LineNr">425 </span>  <span class="Delimiter">}</span>
 <span id="L426" class="LineNr">426 </span><span class="Delimiter">}</span>
 <span id="L427" class="LineNr">427 </span>
 <span id="L428" class="LineNr">428 </span><span class="Delimiter">:(code)</span>
 <span id="L429" class="LineNr">429 </span><span class="Normal">bool</span> has_completed_parent<span class="Delimiter">(</span><span class="Normal">int</span> routine_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L430" class="LineNr">430 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = routine_index<span class="Delimiter">;</span>  j &gt;= <span class="Constant">0</span><span class="Delimiter">;</span>  j = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)-&gt;</span>parent_index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L431" class="LineNr">431 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)-&gt;</span>state == <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">)</span>
-<span id="L432" class="LineNr">432 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)-&gt;</span>state == <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">)</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L433" class="LineNr">433 </span>  <span class="Delimiter">}</span>
 <span id="L434" class="LineNr">434 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L435" class="LineNr">435 </span><span class="Delimiter">}</span>
@@ -521,12 +522,12 @@ if ('onhashchange' in window) {
 <span id="L458" class="LineNr">458 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L459" class="LineNr">459 </span><span class="Normal">case</span> ROUTINE_STATE: <span class="Delimiter">{</span>
 <span id="L460" class="LineNr">460 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L461" class="LineNr">461 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'routine-state' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L462" class="LineNr">462 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'routine-state' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L463" class="LineNr">463 </span>  <span class="Delimiter">}</span>
 <span id="L464" class="LineNr">464 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L465" class="LineNr">465 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'routine-state' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L466" class="LineNr">466 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'routine-state' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L467" class="LineNr">467 </span>  <span class="Delimiter">}</span>
 <span id="L468" class="LineNr">468 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L469" class="LineNr">469 </span><span class="Delimiter">}</span>
@@ -535,10 +536,10 @@ if ('onhashchange' in window) {
 <span id="L472" class="LineNr">472 </span>  <span class="Normal">int</span> id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L473" class="LineNr">473 </span>  <span class="Normal">int</span> result = -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L474" class="LineNr">474 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L475" class="LineNr">475 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L476" class="LineNr">476 </span>      result = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state<span class="Delimiter">;</span>
-<span id="L477" class="LineNr">477 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L478" class="LineNr">478 </span>    <span class="Delimiter">}</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state<span class="Delimiter">;</span>
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L479" class="LineNr">479 </span>  <span class="Delimiter">}</span>
 <span id="L480" class="LineNr">480 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L481" class="LineNr">481 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -554,12 +555,12 @@ if ('onhashchange' in window) {
 <span id="L491" class="LineNr">491 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L492" class="LineNr">492 </span><span class="Normal">case</span> STOP: <span class="Delimiter">{</span>
 <span id="L493" class="LineNr">493 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L494" class="LineNr">494 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'stop' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L495" class="LineNr">495 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'stop' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Delimiter">}</span>
 <span id="L497" class="LineNr">497 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L498" class="LineNr">498 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'stop' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L499" class="LineNr">499 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'stop' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L500" class="LineNr">500 </span>  <span class="Delimiter">}</span>
 <span id="L501" class="LineNr">501 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L502" class="LineNr">502 </span><span class="Delimiter">}</span>
@@ -567,10 +568,10 @@ if ('onhashchange' in window) {
 <span id="L504" class="LineNr">504 </span><span class="Normal">case</span> STOP: <span class="Delimiter">{</span>
 <span id="L505" class="LineNr">505 </span>  <span class="Normal">int</span> id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L506" class="LineNr">506 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L507" class="LineNr">507 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L508" class="LineNr">508 </span>      Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
-<span id="L509" class="LineNr">509 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L510" class="LineNr">510 </span>    <span class="Delimiter">}</span>
+<span id="L507" class="LineNr">507 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L508" class="LineNr">508 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L42'>COMPLETED</a><span class="Delimiter">;</span>
+<span id="L509" class="LineNr">509 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L510" class="LineNr">510 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L511" class="LineNr">511 </span>  <span class="Delimiter">}</span>
 <span id="L512" class="LineNr">512 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L513" class="LineNr">513 </span><span class="Delimiter">}</span>
@@ -586,7 +587,7 @@ if ('onhashchange' in window) {
 <span id="L523" class="LineNr">523 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L524" class="LineNr">524 </span><span class="Normal">case</span> _DUMP_ROUTINES: <span class="Delimiter">{</span>
 <span id="L525" class="LineNr">525 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L526" class="LineNr">526 </span>    cerr &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id &lt;&lt; <span class="Constant">' '</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state &lt;&lt; <span class="Constant">' '</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>parent_index &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L526" class="LineNr">526 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id &lt;&lt; <span class="Constant">' '</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state &lt;&lt; <span class="Constant">' '</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>parent_index &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L527" class="LineNr">527 </span>  <span class="Delimiter">}</span>
 <span id="L528" class="LineNr">528 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L529" class="LineNr">529 </span><span class="Delimiter">}</span>
@@ -615,12 +616,12 @@ if ('onhashchange' in window) {
 <span id="L552" class="LineNr">552 </span><span class="Delimiter">:(before &quot;End Scheduler State Transitions&quot;)</span>
 <span id="L553" class="LineNr">553 </span><span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>limit &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L554" class="LineNr">554 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>limit &lt;= Scheduling_interval<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L555" class="LineNr">555 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;discontinuing routine &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>id &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L556" class="LineNr">556 </span>    Current_routine<span class="Delimiter">-&gt;</span>state = DISCONTINUED<span class="Delimiter">;</span>
-<span id="L557" class="LineNr">557 </span>    Current_routine<span class="Delimiter">-&gt;</span>limit = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L555" class="LineNr">555 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;discontinuing routine &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>id &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L556" class="LineNr">556 </span>  <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>state = DISCONTINUED<span class="Delimiter">;</span>
+<span id="L557" class="LineNr">557 </span>  <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>limit = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L558" class="LineNr">558 </span>  <span class="Delimiter">}</span>
 <span id="L559" class="LineNr">559 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L560" class="LineNr">560 </span>    Current_routine<span class="Delimiter">-&gt;</span>limit -= Scheduling_interval<span class="Delimiter">;</span>
+<span id="L560" class="LineNr">560 </span>  <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-&gt;</span>limit -= Scheduling_interval<span class="Delimiter">;</span>
 <span id="L561" class="LineNr">561 </span>  <span class="Delimiter">}</span>
 <span id="L562" class="LineNr">562 </span><span class="Delimiter">}</span>
 <span id="L563" class="LineNr">563 </span>
@@ -634,8 +635,8 @@ if ('onhashchange' in window) {
 <span id="L571" class="LineNr">571 </span><span class="Delimiter">:(code)</span>
 <span id="L572" class="LineNr">572 </span><span class="Normal">bool</span> any_routines_with_error<span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L573" class="LineNr">573 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L574" class="LineNr">574 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == DISCONTINUED<span class="Delimiter">)</span>
-<span id="L575" class="LineNr">575 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L574" class="LineNr">574 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == DISCONTINUED<span class="Delimiter">)</span>
+<span id="L575" class="LineNr">575 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L576" class="LineNr">576 </span>  <span class="Delimiter">}</span>
 <span id="L577" class="LineNr">577 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L578" class="LineNr">578 </span><span class="Delimiter">}</span>
@@ -652,16 +653,16 @@ if ('onhashchange' in window) {
 <span id="L589" class="LineNr">589 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L590" class="LineNr">590 </span><span class="Normal">case</span> LIMIT_TIME: <span class="Delimiter">{</span>
 <span id="L591" class="LineNr">591 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L592" class="LineNr">592 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'limit-time' requires exactly two ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L593" class="LineNr">593 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L592" class="LineNr">592 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'limit-time' requires exactly two ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L593" class="LineNr">593 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L594" class="LineNr">594 </span>  <span class="Delimiter">}</span>
 <span id="L595" class="LineNr">595 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L596" class="LineNr">596 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'limit-time' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L597" class="LineNr">597 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L596" class="LineNr">596 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'limit-time' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L597" class="LineNr">597 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L598" class="LineNr">598 </span>  <span class="Delimiter">}</span>
 <span id="L599" class="LineNr">599 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L600" class="LineNr">600 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'limit-time' should be a number (of instructions to run for), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L601" class="LineNr">601 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L600" class="LineNr">600 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'limit-time' should be a number (of instructions to run for), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L601" class="LineNr">601 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L602" class="LineNr">602 </span>  <span class="Delimiter">}</span>
 <span id="L603" class="LineNr">603 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L604" class="LineNr">604 </span><span class="Delimiter">}</span>
@@ -669,10 +670,10 @@ if ('onhashchange' in window) {
 <span id="L606" class="LineNr">606 </span><span class="Normal">case</span> LIMIT_TIME: <span class="Delimiter">{</span>
 <span id="L607" class="LineNr">607 </span>  <span class="Normal">int</span> id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L608" class="LineNr">608 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L609" class="LineNr">609 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L610" class="LineNr">610 </span>      Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>limit = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L611" class="LineNr">611 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L612" class="LineNr">612 </span>    <span class="Delimiter">}</span>
+<span id="L609" class="LineNr">609 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L610" class="LineNr">610 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>limit = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L611" class="LineNr">611 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L612" class="LineNr">612 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L613" class="LineNr">613 </span>  <span class="Delimiter">}</span>
 <span id="L614" class="LineNr">614 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L615" class="LineNr">615 </span><span class="Delimiter">}</span>
@@ -690,12 +691,12 @@ if ('onhashchange' in window) {
 <span id="L627" class="LineNr">627 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L628" class="LineNr">628 </span><span class="Normal">case</span> NUMBER_OF_INSTRUCTIONS: <span class="Delimiter">{</span>
 <span id="L629" class="LineNr">629 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L630" class="LineNr">630 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'number-of-instructions' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L631" class="LineNr">631 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L630" class="LineNr">630 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'number-of-instructions' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L631" class="LineNr">631 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L632" class="LineNr">632 </span>  <span class="Delimiter">}</span>
 <span id="L633" class="LineNr">633 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L634" class="LineNr">634 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'number-of-instructions' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L635" class="LineNr">635 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L634" class="LineNr">634 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'number-of-instructions' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L635" class="LineNr">635 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L636" class="LineNr">636 </span>  <span class="Delimiter">}</span>
 <span id="L637" class="LineNr">637 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L638" class="LineNr">638 </span><span class="Delimiter">}</span>
@@ -704,10 +705,10 @@ if ('onhashchange' in window) {
 <span id="L641" class="LineNr">641 </span>  <span class="Normal">int</span> id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L642" class="LineNr">642 </span>  <span class="Normal">int</span> result = -<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L643" class="LineNr">643 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L644" class="LineNr">644 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L645" class="LineNr">645 </span>      result = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>instructions_run<span class="Delimiter">;</span>
-<span id="L646" class="LineNr">646 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L647" class="LineNr">647 </span>    <span class="Delimiter">}</span>
+<span id="L644" class="LineNr">644 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L645" class="LineNr">645 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>instructions_run<span class="Delimiter">;</span>
+<span id="L646" class="LineNr">646 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L647" class="LineNr">647 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L648" class="LineNr">648 </span>  <span class="Delimiter">}</span>
 <span id="L649" class="LineNr">649 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L650" class="LineNr">650 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -718,7 +719,7 @@ if ('onhashchange' in window) {
 <span id="L655" class="LineNr">655 </span><span class="muRecipe">def</span> f1 [
 <span id="L656" class="LineNr">656 </span>  <span class="Constant">10</span>:num/child-id<span class="Special"> &lt;- </span>start-running f2
 <span id="L657" class="LineNr">657 </span>  <span class="Delimiter">{</span>
-<span id="L658" class="LineNr">658 </span>    loop-unless <span class="Constant">20</span>:num
+<span id="L658" class="LineNr">658 </span>  <span class="Conceal">¦</span> loop-unless <span class="Constant">20</span>:num
 <span id="L659" class="LineNr">659 </span>  <span class="Delimiter">}</span>
 <span id="L660" class="LineNr">660 </span>  <span class="Constant">11</span>:num<span class="Special"> &lt;- </span>number-of-instructions <span class="Constant">10</span>:num
 <span id="L661" class="LineNr">661 </span>]
@@ -736,7 +737,7 @@ if ('onhashchange' in window) {
 <span id="L673" class="LineNr">673 </span><span class="muRecipe">def</span> f1 [
 <span id="L674" class="LineNr">674 </span>  <span class="Constant">10</span>:num/child-id<span class="Special"> &lt;- </span>start-running f2
 <span id="L675" class="LineNr">675 </span>  <span class="Delimiter">{</span>
-<span id="L676" class="LineNr">676 </span>    loop-unless <span class="Constant">20</span>:num
+<span id="L676" class="LineNr">676 </span>  <span class="Conceal">¦</span> loop-unless <span class="Constant">20</span>:num
 <span id="L677" class="LineNr">677 </span>  <span class="Delimiter">}</span>
 <span id="L678" class="LineNr">678 </span>  <span class="Constant">11</span>:num<span class="Special"> &lt;- </span>number-of-instructions <span class="Constant">10</span>:num
 <span id="L679" class="LineNr">679 </span>]
@@ -759,7 +760,7 @@ if ('onhashchange' in window) {
 <span id="L696" class="LineNr">696 </span>  <span class="Constant">1</span>:&amp;:num/<span class="Special">raw &lt;- </span><span class="Normal">new</span> <span class="Constant">number:type</span>
 <span id="L697" class="LineNr">697 </span>  <span class="Comment"># wait for f2 to complete</span>
 <span id="L698" class="LineNr">698 </span>  <span class="Delimiter">{</span>
-<span id="L699" class="LineNr">699 </span>    loop-unless <span class="Constant">4</span>:num/<span class="Special">raw</span>
+<span id="L699" class="LineNr">699 </span>  <span class="Conceal">¦</span> loop-unless <span class="Constant">4</span>:num/<span class="Special">raw</span>
 <span id="L700" class="LineNr">700 </span>  <span class="Delimiter">}</span>
 <span id="L701" class="LineNr">701 </span>]
 <span id="L702" class="LineNr">702 </span><span class="muRecipe">def</span> f2 [
diff --git a/html/073wait.cc.html b/html/073wait.cc.html
index c2569b5a..22a488c2 100644
--- a/html/073wait.cc.html
+++ b/html/073wait.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.Special { color: #c00000; }
+.SalientComment { color: #00ffff; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
+.muData { color: #ffff00; }
 .LineNr { color: #444444; }
 .traceContains { color: #008000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
+.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
 .Identifier { color: #c0a020; }
-.SalientComment { color: #00ffff; }
 -->
 </style>
 
@@ -109,15 +110,15 @@ if ('onhashchange' in window) {
 <span id="L46" class="LineNr"> 46 </span><span class="Delimiter">:(code)</span>
 <span id="L47" class="LineNr"> 47 </span><span class="Normal">bool</span> <a href='073wait.cc.html#L47'>any_routines_waiting</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L49" class="LineNr"> 49 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == WAITING<span class="Delimiter">)</span>
-<span id="L50" class="LineNr"> 50 </span>      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == WAITING<span class="Delimiter">)</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L51" class="LineNr"> 51 </span>  <span class="Delimiter">}</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L53" class="LineNr"> 53 </span><span class="Delimiter">}</span>
 <span id="L54" class="LineNr"> 54 </span><span class="Normal">void</span> <a href='073wait.cc.html#L54'>dump_waiting_routines</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L55" class="LineNr"> 55 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L56" class="LineNr"> 56 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == WAITING<span class="Delimiter">)</span>
-<span id="L57" class="LineNr"> 57 </span>      cerr &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; <a href='072scheduler.cc.html#L107'>routine_label</a><span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == WAITING<span class="Delimiter">)</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; <a href='072scheduler.cc.html#L107'>routine_label</a><span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L58" class="LineNr"> 58 </span>  <span class="Delimiter">}</span>
 <span id="L59" class="LineNr"> 59 </span><span class="Delimiter">}</span>
 <span id="L60" class="LineNr"> 60 </span>
@@ -141,11 +142,11 @@ if ('onhashchange' in window) {
 <span id="L78" class="LineNr"> 78 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L79" class="LineNr"> 79 </span><span class="Normal">case</span> WAIT_FOR_RESET_THEN_SET: <span class="Delimiter">{</span>
 <span id="L80" class="LineNr"> 80 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L81" class="LineNr"> 81 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-reset-then-set' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L82" class="LineNr"> 82 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-reset-then-set' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Delimiter">}</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_location<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L85" class="LineNr"> 85 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-reset-then-set' requires a location ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-reset-then-set' requires a location ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Delimiter">}</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L88" class="LineNr"> 88 </span><span class="Delimiter">}</span>
@@ -154,9 +155,9 @@ if ('onhashchange' in window) {
 <span id="L91" class="LineNr"> 91 </span>  <span class="Normal">int</span> loc = <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L92" class="LineNr"> 92 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;wait: *&quot;</span> &lt;&lt; loc &lt;&lt; <span class="Constant">&quot; = &quot;</span> &lt;&lt; <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L93" class="LineNr"> 93 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L94" class="LineNr"> 94 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; loc &lt;&lt; <span class="Constant">&quot; is already 0; setting&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L95" class="LineNr"> 95 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L96" class="LineNr"> 96 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;location &quot;</span> &lt;&lt; loc &lt;&lt; <span class="Constant">&quot; is already 0; setting&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L97" class="LineNr"> 97 </span>  <span class="Delimiter">}</span>
 <span id="L98" class="LineNr"> 98 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waiting for location &quot;</span> &lt;&lt; loc &lt;&lt; <span class="Constant">&quot; to reset&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L99" class="LineNr"> 99 </span>  Current_routine<span class="Delimiter">-&gt;</span>state = WAITING<span class="Delimiter">;</span>
@@ -172,11 +173,11 @@ if ('onhashchange' in window) {
 <span id="L109" class="LineNr">109 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L110" class="LineNr">110 </span><span class="Normal">case</span> RESET: <span class="Delimiter">{</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L112" class="LineNr">112 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'reset' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L113" class="LineNr">113 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'reset' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Delimiter">}</span>
 <span id="L115" class="LineNr">115 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_location<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L116" class="LineNr">116 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'reset' requires a location ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'reset' requires a location ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Delimiter">}</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L119" class="LineNr">119 </span><span class="Delimiter">}</span>
@@ -195,10 +196,10 @@ if ('onhashchange' in window) {
 <span id="L132" class="LineNr">132 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state != WAITING<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
 <span id="L133" class="LineNr">133 </span>  <span class="Normal">int</span> loc = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>waiting_on_location<span class="Delimiter">;</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>loc &amp;&amp; <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L135" class="LineNr">135 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waking up routine &quot;</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L136" class="LineNr">136 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L137" class="LineNr">137 </span>    Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
-<span id="L138" class="LineNr">138 </span>    Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>waiting_on_location = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waking up routine &quot;</span> &lt;&lt; Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> loc<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>waiting_on_location = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
 <span id="L140" class="LineNr">140 </span><span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>
@@ -221,42 +222,42 @@ if ('onhashchange' in window) {
 <span id="L158" class="LineNr">158 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L159" class="LineNr">159 </span><span class="Normal">case</span> GET_LOCATION: <span class="Delimiter">{</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L161" class="LineNr">161 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get-location' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L162" class="LineNr">162 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get-location' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Delimiter">}</span>
 <span id="L164" class="LineNr">164 </span>  reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!canonize_type<span class="Delimiter">(</span>base<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L166" class="LineNr">166 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L167" class="LineNr">167 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get-location' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L168" class="LineNr">168 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get-location' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Delimiter">}</span>
 <span id="L170" class="LineNr">170 </span>  <span class="Normal">const</span> type_tree* base_root_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom ? base<span class="Delimiter">.</span>type : base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">;</span>
 <span id="L171" class="LineNr">171 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!base_root_type<span class="Delimiter">-&gt;</span>atom || base_root_type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span> || !contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_root_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_root_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind != <a href='010vm.cc.html#L173'>CONTAINER</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L172" class="LineNr">172 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get-location' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L173" class="LineNr">173 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get-location' should be a container, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span>  <a href='010vm.cc.html#L123'>type_ordinal</a> base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Normal">const</span> reagent&amp; offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L178" class="LineNr">178 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'get-location' should have type 'offset', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L179" class="LineNr">179 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'get-location' should have type 'offset', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L180" class="LineNr">180 </span>  <span class="Delimiter">}</span>
 <span id="L181" class="LineNr">181 </span>  <span class="Normal">int</span> offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Comment">//: later layers will permit non-integer offsets</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L184" class="LineNr">184 </span>    offset_value = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
-<span id="L185" class="LineNr">185 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L186" class="LineNr">186 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset &quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot; for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L187" class="LineNr">187 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L188" class="LineNr">188 </span>    <span class="Delimiter">}</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> offset_value = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset &quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot; for '&quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L189" class="LineNr">189 </span>  <span class="Delimiter">}</span>
 <span id="L190" class="LineNr">190 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L191" class="LineNr">191 </span>    offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L192" class="LineNr">192 </span>  <span class="Delimiter">}</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_location<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L195" class="LineNr">195 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get-location &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to type location but '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' has type '&quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L196" class="LineNr">196 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get-location &quot;</span> &lt;&lt; base<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' should write to type location but '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot;' has type '&quot;</span> &lt;&lt; names_to_string_without_quotes<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L197" class="LineNr">197 </span>  <span class="Delimiter">}</span>
 <span id="L198" class="LineNr">198 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L199" class="LineNr">199 </span><span class="Delimiter">}</span>
@@ -266,15 +267,15 @@ if ('onhashchange' in window) {
 <span id="L203" class="LineNr">203 </span>  canonize<span class="Delimiter">(</span>base<span class="Delimiter">);</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">int</span> base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
 <span id="L205" class="LineNr">205 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L207" class="LineNr">207 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;tried to access location 0 in '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Delimiter">}</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Normal">const</span> type_tree* base_type = get_base_type<span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L210" class="LineNr">210 </span>  <span class="Normal">int</span> offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L211" class="LineNr">211 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>offset &lt; <span class="Constant">0</span> || offset &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// copied from Check above</span>
 <span id="L212" class="LineNr">212 </span>  <span class="Normal">int</span> result = base_address<span class="Delimiter">;</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; offset<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span>
-<span id="L214" class="LineNr">214 </span>    result += size_of<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">,</span> i<span class="Delimiter">));</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> result += size_of<span class="Delimiter">(</span><a href='030container.cc.html#L430'>element_type</a><span class="Delimiter">(</span>base<span class="Delimiter">.</span>type<span class="Delimiter">,</span> i<span class="Delimiter">));</span>
 <span id="L215" class="LineNr">215 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; result &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L216" class="LineNr">216 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L217" class="LineNr">217 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -388,20 +389,20 @@ if ('onhashchange' in window) {
 <span id="L325" class="LineNr">325 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L326" class="LineNr">326 </span><span class="Normal">case</span> WAIT_FOR_ROUTINE: <span class="Delimiter">{</span>
 <span id="L327" class="LineNr">327 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L328" class="LineNr">328 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-routine' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L329" class="LineNr">329 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-routine' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L330" class="LineNr">330 </span>  <span class="Delimiter">}</span>
 <span id="L331" class="LineNr">331 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L332" class="LineNr">332 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'wait-for-routine' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L333" class="LineNr">333 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'wait-for-routine' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L334" class="LineNr">334 </span>  <span class="Delimiter">}</span>
 <span id="L335" class="LineNr">335 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L336" class="LineNr">336 </span><span class="Delimiter">}</span>
 <span id="L337" class="LineNr">337 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L338" class="LineNr">338 </span><span class="Normal">case</span> WAIT_FOR_ROUTINE: <span class="Delimiter">{</span>
 <span id="L339" class="LineNr">339 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == Current_routine<span class="Delimiter">-&gt;</span>id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L340" class="LineNr">340 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;routine can't wait for itself! '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L341" class="LineNr">341 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;routine can't wait for itself! '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Delimiter">}</span>
 <span id="L343" class="LineNr">343 </span>  Current_routine<span class="Delimiter">-&gt;</span>state = WAITING<span class="Delimiter">;</span>
 <span id="L344" class="LineNr">344 </span>  Current_routine<span class="Delimiter">-&gt;</span>waiting_on_routine = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -420,13 +421,13 @@ if ('onhashchange' in window) {
 <span id="L357" class="LineNr">357 </span>  <span class="Normal">int</span> id = waiter<span class="Delimiter">-&gt;</span>waiting_on_routine<span class="Delimiter">;</span>
 <span id="L358" class="LineNr">358 </span>  assert<span class="Delimiter">(</span>id != waiter<span class="Delimiter">-&gt;</span>id<span class="Delimiter">);</span>  <span class="Comment">// routine can't wait on itself</span>
 <span id="L359" class="LineNr">359 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L360" class="LineNr">360 </span>    <span class="Normal">const</span> routine* waitee = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
-<span id="L361" class="LineNr">361 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>waitee<span class="Delimiter">-&gt;</span>id == id &amp;&amp; waitee<span class="Delimiter">-&gt;</span>state != <a href='072scheduler.cc.html#L41'>RUNNING</a> &amp;&amp; waitee<span class="Delimiter">-&gt;</span>state != WAITING<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L362" class="LineNr">362 </span>      <span class="Comment">// routine is COMPLETED or DISCONTINUED</span>
-<span id="L363" class="LineNr">363 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waking up routine &quot;</span> &lt;&lt; waiter<span class="Delimiter">-&gt;</span>id &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L364" class="LineNr">364 </span>      waiter<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
-<span id="L365" class="LineNr">365 </span>      waiter<span class="Delimiter">-&gt;</span>waiting_on_routine = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L366" class="LineNr">366 </span>    <span class="Delimiter">}</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> routine* waitee = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>waitee<span class="Delimiter">-&gt;</span>id == id &amp;&amp; waitee<span class="Delimiter">-&gt;</span>state != <a href='072scheduler.cc.html#L41'>RUNNING</a> &amp;&amp; waitee<span class="Delimiter">-&gt;</span>state != WAITING<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// routine is COMPLETED or DISCONTINUED</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waking up routine &quot;</span> &lt;&lt; waiter<span class="Delimiter">-&gt;</span>id &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> waiter<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> waiter<span class="Delimiter">-&gt;</span>waiting_on_routine = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L367" class="LineNr">367 </span>  <span class="Delimiter">}</span>
 <span id="L368" class="LineNr">368 </span><span class="Delimiter">}</span>
 <span id="L369" class="LineNr">369 </span>
@@ -487,8 +488,8 @@ if ('onhashchange' in window) {
 <span id="L424" class="LineNr">424 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L425" class="LineNr">425 </span><span class="Normal">case</span> CURRENT_ROUTINE_IS_BLOCKED: <span class="Delimiter">{</span>
 <span id="L426" class="LineNr">426 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L427" class="LineNr">427 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'current-routine-is-blocked' should have no ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L428" class="LineNr">428 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'current-routine-is-blocked' should have no ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L429" class="LineNr">429 </span>  <span class="Delimiter">}</span>
 <span id="L430" class="LineNr">430 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L431" class="LineNr">431 </span><span class="Delimiter">}</span>
@@ -505,8 +506,8 @@ if ('onhashchange' in window) {
 <span id="L442" class="LineNr">442 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L443" class="LineNr">443 </span><span class="Normal">case</span> CURRENT_ROUTINE_IS_UNBLOCKED: <span class="Delimiter">{</span>
 <span id="L444" class="LineNr">444 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L445" class="LineNr">445 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'current-routine-is-unblocked' should have no ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L446" class="LineNr">446 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'current-routine-is-unblocked' should have no ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L447" class="LineNr">447 </span>  <span class="Delimiter">}</span>
 <span id="L448" class="LineNr">448 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L449" class="LineNr">449 </span><span class="Delimiter">}</span>
@@ -550,20 +551,20 @@ if ('onhashchange' in window) {
 <span id="L487" class="LineNr">487 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L488" class="LineNr">488 </span><span class="Normal">case</span> WAIT_FOR_ROUTINE_TO_BLOCK: <span class="Delimiter">{</span>
 <span id="L489" class="LineNr">489 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L490" class="LineNr">490 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-routine-to-block' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L491" class="LineNr">491 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L490" class="LineNr">490 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'wait-for-routine-to-block' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L491" class="LineNr">491 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L492" class="LineNr">492 </span>  <span class="Delimiter">}</span>
 <span id="L493" class="LineNr">493 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L494" class="LineNr">494 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'wait-for-routine-to-block' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L495" class="LineNr">495 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'wait-for-routine-to-block' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Delimiter">}</span>
 <span id="L497" class="LineNr">497 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L498" class="LineNr">498 </span><span class="Delimiter">}</span>
 <span id="L499" class="LineNr">499 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L500" class="LineNr">500 </span><span class="Normal">case</span> WAIT_FOR_ROUTINE_TO_BLOCK: <span class="Delimiter">{</span>
 <span id="L501" class="LineNr">501 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == Current_routine<span class="Delimiter">-&gt;</span>id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L502" class="LineNr">502 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;routine can't wait for itself! '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L503" class="LineNr">503 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;routine can't wait for itself! '&quot;</span> &lt;&lt; to_original_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L504" class="LineNr">504 </span>  <span class="Delimiter">}</span>
 <span id="L505" class="LineNr">505 </span>  Current_routine<span class="Delimiter">-&gt;</span>state = WAITING<span class="Delimiter">;</span>
 <span id="L506" class="LineNr">506 </span>  Current_routine<span class="Delimiter">-&gt;</span>waiting_on_routine_to_block = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -580,13 +581,13 @@ if ('onhashchange' in window) {
 <span id="L517" class="LineNr">517 </span>  <span class="Normal">int</span> id = waiter<span class="Delimiter">-&gt;</span>waiting_on_routine_to_block<span class="Delimiter">;</span>
 <span id="L518" class="LineNr">518 </span>  assert<span class="Delimiter">(</span>id != waiter<span class="Delimiter">-&gt;</span>id<span class="Delimiter">);</span>  <span class="Comment">// routine can't wait on itself</span>
 <span id="L519" class="LineNr">519 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L520" class="LineNr">520 </span>    <span class="Normal">const</span> routine* waitee = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
-<span id="L521" class="LineNr">521 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>waitee<span class="Delimiter">-&gt;</span>id != id<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L522" class="LineNr">522 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>waitee<span class="Delimiter">-&gt;</span>state != <a href='072scheduler.cc.html#L41'>RUNNING</a> || waitee<span class="Delimiter">-&gt;</span>blocked<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L523" class="LineNr">523 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waking up routine &quot;</span> &lt;&lt; waiter<span class="Delimiter">-&gt;</span>id &lt;&lt; <span class="Constant">&quot; because routine &quot;</span> &lt;&lt; waitee<span class="Delimiter">-&gt;</span>id &lt;&lt; <span class="Constant">&quot; is blocked&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L524" class="LineNr">524 </span>      waiter<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
-<span id="L525" class="LineNr">525 </span>      waiter<span class="Delimiter">-&gt;</span>waiting_on_routine_to_block = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L526" class="LineNr">526 </span>    <span class="Delimiter">}</span>
+<span id="L520" class="LineNr">520 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> routine* waitee = Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
+<span id="L521" class="LineNr">521 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>waitee<span class="Delimiter">-&gt;</span>id != id<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>waitee<span class="Delimiter">-&gt;</span>state != <a href='072scheduler.cc.html#L41'>RUNNING</a> || waitee<span class="Delimiter">-&gt;</span>blocked<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;schedule&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;waking up routine &quot;</span> &lt;&lt; waiter<span class="Delimiter">-&gt;</span>id &lt;&lt; <span class="Constant">&quot; because routine &quot;</span> &lt;&lt; waitee<span class="Delimiter">-&gt;</span>id &lt;&lt; <span class="Constant">&quot; is blocked&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L524" class="LineNr">524 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> waiter<span class="Delimiter">-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
+<span id="L525" class="LineNr">525 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> waiter<span class="Delimiter">-&gt;</span>waiting_on_routine_to_block = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L526" class="LineNr">526 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L527" class="LineNr">527 </span>  <span class="Delimiter">}</span>
 <span id="L528" class="LineNr">528 </span><span class="Delimiter">}</span>
 <span id="L529" class="LineNr">529 </span>
@@ -599,12 +600,12 @@ if ('onhashchange' in window) {
 <span id="L536" class="LineNr">536 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L537" class="LineNr">537 </span><span class="Normal">case</span> RESTART: <span class="Delimiter">{</span>
 <span id="L538" class="LineNr">538 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L539" class="LineNr">539 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'restart' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L540" class="LineNr">540 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'restart' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L540" class="LineNr">540 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L541" class="LineNr">541 </span>  <span class="Delimiter">}</span>
 <span id="L542" class="LineNr">542 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L543" class="LineNr">543 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'restart' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L544" class="LineNr">544 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'restart' should be a routine id generated by 'start-running', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L544" class="LineNr">544 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L545" class="LineNr">545 </span>  <span class="Delimiter">}</span>
 <span id="L546" class="LineNr">546 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L547" class="LineNr">547 </span><span class="Delimiter">}</span>
@@ -612,12 +613,12 @@ if ('onhashchange' in window) {
 <span id="L549" class="LineNr">549 </span><span class="Normal">case</span> RESTART: <span class="Delimiter">{</span>
 <span id="L550" class="LineNr">550 </span>  <span class="Normal">int</span> id = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L551" class="LineNr">551 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Routines<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L552" class="LineNr">552 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L553" class="LineNr">553 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == WAITING<span class="Delimiter">)</span>
-<span id="L554" class="LineNr">554 </span>        Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
-<span id="L555" class="LineNr">555 </span>      Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>blocked = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L556" class="LineNr">556 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L557" class="LineNr">557 </span>    <span class="Delimiter">}</span>
+<span id="L552" class="LineNr">552 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>id == id<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L553" class="LineNr">553 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state == WAITING<span class="Delimiter">)</span>
+<span id="L554" class="LineNr">554 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>state = <a href='072scheduler.cc.html#L41'>RUNNING</a><span class="Delimiter">;</span>
+<span id="L555" class="LineNr">555 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Routines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>blocked = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L556" class="LineNr">556 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L557" class="LineNr">557 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L558" class="LineNr">558 </span>  <span class="Delimiter">}</span>
 <span id="L559" class="LineNr">559 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L560" class="LineNr">560 </span><span class="Delimiter">}</span>
diff --git a/html/074deep_copy.cc.html b/html/074deep_copy.cc.html
index a095aac9..5d3b52f8 100644
--- a/html/074deep_copy.cc.html
+++ b/html/074deep_copy.cc.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
 .Special { color: #c00000; }
 .muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .cSpecial { color: #008000; }
+.muData { color: #ffff00; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
-.muData { color: #ffff00; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.Constant { color: #00a0a0; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -257,16 +258,16 @@ if ('onhashchange' in window) {
 <span id="L195" class="LineNr">195 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L196" class="LineNr">196 </span><span class="Normal">case</span> DEEP_COPY: <span class="Delimiter">{</span>
 <span id="L197" class="LineNr">197 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L198" class="LineNr">198 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L199" class="LineNr">199 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L200" class="LineNr">200 </span>  <span class="Delimiter">}</span>
 <span id="L201" class="LineNr">201 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L202" class="LineNr">202 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L203" class="LineNr">203 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' takes exactly one ingredient rather than '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L204" class="LineNr">204 </span>  <span class="Delimiter">}</span>
 <span id="L205" class="LineNr">205 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L206" class="LineNr">206 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' requires its ingredient and product to be the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L207" class="LineNr">207 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'deep-copy' requires its ingredient and product to be the same type, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Delimiter">}</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L210" class="LineNr">210 </span><span class="Delimiter">}</span>
@@ -295,9 +296,9 @@ if ('onhashchange' in window) {
 <span id="L233" class="LineNr">233 </span>  canonize<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L234" class="LineNr">234 </span>  vector&lt;<span class="Normal">double</span>&gt; result<span class="Delimiter">;</span>
 <span id="L235" class="LineNr">235 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>in<span class="Delimiter">))</span>
-<span id="L236" class="LineNr">236 </span>    result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='074deep_copy.cc.html#L243'>deep_copy_address</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">));</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='074deep_copy.cc.html#L243'>deep_copy_address</a><span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">));</span>
 <span id="L237" class="LineNr">237 </span>  <span class="Normal">else</span>
-<span id="L238" class="LineNr">238 </span>    deep_copy<span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">,</span> result<span class="Delimiter">);</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> deep_copy<span class="Delimiter">(</span>in<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">,</span> result<span class="Delimiter">);</span>
 <span id="L239" class="LineNr">239 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L240" class="LineNr">240 </span><span class="Delimiter">}</span>
 <span id="L241" class="LineNr">241 </span>
@@ -307,9 +308,9 @@ if ('onhashchange' in window) {
 <span id="L245" class="LineNr">245 </span>  <span class="Normal">int</span> in_address = <a href='074deep_copy.cc.html#L298'>payload_address</a><span class="Delimiter">(</span>canonized_in<span class="Delimiter">);</span>
 <span id="L246" class="LineNr">246 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copying <a href='043space.cc.html#L76'>address</a> &quot;</span> &lt;&lt; in_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L247" class="LineNr">247 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>addresses_copied<span class="Delimiter">,</span> in_address<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L248" class="LineNr">248 </span>    <span class="Normal">int</span> out = get<span class="Delimiter">(</span>addresses_copied<span class="Delimiter">,</span> in_address<span class="Delimiter">);</span>
-<span id="L249" class="LineNr">249 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copy already exists: &quot;</span> &lt;&lt; out &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L250" class="LineNr">250 </span>    <span class="Identifier">return</span> out<span class="Delimiter">;</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> out = get<span class="Delimiter">(</span>addresses_copied<span class="Delimiter">,</span> in_address<span class="Delimiter">);</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copy already exists: &quot;</span> &lt;&lt; out &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> out<span class="Delimiter">;</span>
 <span id="L251" class="LineNr">251 </span>  <span class="Delimiter">}</span>
 <span id="L252" class="LineNr">252 </span>  <span class="Normal">int</span> out = allocate<span class="Delimiter">(</span><a href='036refcount.cc.html#L82'>payload_size</a><span class="Delimiter">(</span>canonized_in<span class="Delimiter">));</span>
 <span id="L253" class="LineNr">253 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: new <a href='043space.cc.html#L76'>address</a> is &quot;</span> &lt;&lt; out &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
@@ -340,20 +341,20 @@ if ('onhashchange' in window) {
 <span id="L278" class="LineNr">278 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: scanning for addresses in &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>data<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L279" class="LineNr">279 </span>  <span class="Normal">const</span> container_metadata&amp; metadata = get<span class="Delimiter">(</span>Container_metadata<span class="Delimiter">,</span> canonized_in<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
 <span id="L280" class="LineNr">280 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;set&lt;tag_condition_info&gt;<span class="Delimiter">,</span> set&lt;address_element_info&gt; &gt;::const_iterator p = metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != metadata<span class="Delimiter">.</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L281" class="LineNr">281 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L282" class="LineNr">282 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L283" class="LineNr">283 </span>      <span class="Comment">// construct a fake reagent that reads directly from the appropriate</span>
-<span id="L284" class="LineNr">284 </span>      <span class="Comment">// field of the container</span>
-<span id="L285" class="LineNr">285 </span>      reagent curr<span class="Delimiter">;</span>
-<span id="L286" class="LineNr">286 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
-<span id="L287" class="LineNr">287 </span>        curr<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;address&quot;</span><span class="Delimiter">),</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">-&gt;</span>name<span class="Delimiter">),</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
-<span id="L288" class="LineNr">288 </span>      <span class="Normal">else</span>
-<span id="L289" class="LineNr">289 </span>        curr<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;address&quot;</span><span class="Delimiter">),</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">));</span>
-<span id="L290" class="LineNr">290 </span>      curr<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>canonized_in<span class="Delimiter">.</span>value + info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">);</span>
-<span id="L291" class="LineNr">291 </span>      curr<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;raw&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
-<span id="L292" class="LineNr">292 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copying <a href='043space.cc.html#L76'>address</a> &quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L293" class="LineNr">293 </span>      out<span class="Delimiter">.</span>at<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> = <a href='074deep_copy.cc.html#L243'>deep_copy_address</a><span class="Delimiter">(</span>curr<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
-<span id="L294" class="LineNr">294 </span>    <span class="Delimiter">}</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!all_match<span class="Delimiter">(</span>data<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>set&lt;address_element_info&gt;::const_iterator info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  info != p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++info<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// construct a fake reagent that reads directly from the appropriate</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// field of the container</span>
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent curr<span class="Delimiter">;</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;address&quot;</span><span class="Delimiter">),</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">-&gt;</span>name<span class="Delimiter">),</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>type = <span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Normal">new</span> type_tree<span class="Delimiter">(</span><span class="Constant">&quot;address&quot;</span><span class="Delimiter">),</span> <span class="Normal">new</span> type_tree<span class="Delimiter">(</span>*info<span class="Delimiter">-&gt;</span><a href='030container.cc.html#L238'>payload_type</a><span class="Delimiter">));</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr<span class="Delimiter">.</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>canonized_in<span class="Delimiter">.</span>value + info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">);</span>
+<span id="L291" class="LineNr">291 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span><span class="Constant">&quot;raw&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">));</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;deep-copy: copying <a href='043space.cc.html#L76'>address</a> &quot;</span> &lt;&lt; curr<span class="Delimiter">.</span>value &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out<span class="Delimiter">.</span>at<span class="Delimiter">(</span>info<span class="Delimiter">-&gt;</span>offset<span class="Delimiter">)</span> = <a href='074deep_copy.cc.html#L243'>deep_copy_address</a><span class="Delimiter">(</span>curr<span class="Delimiter">,</span> addresses_copied<span class="Delimiter">,</span> tmp<span class="Delimiter">);</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L295" class="LineNr">295 </span>  <span class="Delimiter">}</span>
 <span id="L296" class="LineNr">296 </span><span class="Delimiter">}</span>
 <span id="L297" class="LineNr">297 </span>
diff --git a/html/075channel.mu.html b/html/075channel.mu.html
index 5c486beb..a0493e7e 100644
--- a/html/075channel.mu.html
+++ b/html/075channel.mu.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.CommentedCode { color: #6c6c6c; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -78,14 +79,14 @@ if ('onhashchange' in window) {
 <span id="L16" class="LineNr"> 16 </span>
 <span id="L17" class="LineNr"> 17 </span><span class="muScenario">scenario</span> channel [
 <span id="L18" class="LineNr"> 18 </span>  run [
-<span id="L19" class="LineNr"> 19 </span>    <span class="Constant">local-scope</span>
-<span id="L20" class="LineNr"> 20 </span>    source:&amp;:source:num, sink:&amp;:sink:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
-<span id="L21" class="LineNr"> 21 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
-<span id="L22" class="LineNr"> 22 </span>    10:num/<span class="Special">raw</span>, 11:bool/<span class="Special">raw</span>, source <span class="Special">&lt;-</span> read source
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> source:&amp;:source:num, sink:&amp;:sink:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span>, 11:bool/<span class="Special">raw</span>, source <span class="Special">&lt;-</span> read source
 <span id="L23" class="LineNr"> 23 </span>  ]
 <span id="L24" class="LineNr"> 24 </span>  memory-should-contain [
-<span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
-<span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># read was successful</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 34</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># read was successful</span>
 <span id="L27" class="LineNr"> 27 </span>  ]
 <span id="L28" class="LineNr"> 28 </span>]
 <span id="L29" class="LineNr"> 29 </span>
@@ -136,17 +137,17 @@ if ('onhashchange' in window) {
 <span id="L74" class="LineNr"> 74 </span><span class="CommentedCode">#?   $print [write], 10/newline</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Delimiter">{</span>
 <span id="L76" class="LineNr"> 76 </span><span class="CommentedCode">#?     $print [trying to acquire lock for writing], 10/newline</span>
-<span id="L77" class="LineNr"> 77 </span>    wait-for-reset-then-set lock
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> wait-for-reset-then-set lock
 <span id="L78" class="LineNr"> 78 </span><span class="CommentedCode">#?     $print [lock acquired for writing], 10/newline</span>
-<span id="L79" class="LineNr"> 79 </span>    full?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
-<span id="L80" class="LineNr"> 80 </span>    <span class="muControl">break-unless</span> full?
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> full?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> full?
 <span id="L81" class="LineNr"> 81 </span><span class="CommentedCode">#?     $print [but channel is full; relinquishing lock], 10/newline</span>
-<span id="L82" class="LineNr"> 82 </span>    <span class="Comment"># channel is full; relinquish lock and give a reader the opportunity to</span>
-<span id="L83" class="LineNr"> 83 </span>    <span class="Comment"># create room on it</span>
-<span id="L84" class="LineNr"> 84 </span>    reset lock
-<span id="L85" class="LineNr"> 85 </span>    current-routine-is-blocked
-<span id="L86" class="LineNr"> 86 </span>    switch  <span class="Comment"># avoid spinlocking</span>
-<span id="L87" class="LineNr"> 87 </span>    <span class="muControl">loop</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Comment"># channel is full; relinquish lock and give a reader the opportunity to</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Comment"># create room on it</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> reset lock
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> current-routine-is-blocked
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> switch  <span class="Comment"># avoid spinlocking</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Delimiter">}</span>
 <span id="L89" class="LineNr"> 89 </span>  current-routine-is-unblocked
 <span id="L90" class="LineNr"> 90 </span><span class="CommentedCode">#?   $print [performing write], 10/newline</span>
@@ -158,11 +159,11 @@ if ('onhashchange' in window) {
 <span id="L96" class="LineNr"> 96 </span>  <span class="Comment"># mark its slot as filled</span>
 <span id="L97" class="LineNr"> 97 </span>  free <span class="Special">&lt;-</span> add free,<span class="Constant"> 1</span>
 <span id="L98" class="LineNr"> 98 </span>  <span class="Delimiter">{</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="Comment"># wrap free around to 0 if necessary</span>
-<span id="L100" class="LineNr">100 </span>    len:num <span class="Special">&lt;-</span> length *circular-buffer
-<span id="L101" class="LineNr">101 </span>    at-end?:bool <span class="Special">&lt;-</span> greater-or-equal free, len
-<span id="L102" class="LineNr">102 </span>    <span class="muControl">break-unless</span> at-end?
-<span id="L103" class="LineNr">103 </span>    free <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Comment"># wrap free around to 0 if necessary</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> len:num <span class="Special">&lt;-</span> length *circular-buffer
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> at-end?:bool <span class="Special">&lt;-</span> greater-or-equal free, len
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> free <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Delimiter">}</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Comment"># write back</span>
 <span id="L106" class="LineNr">106 </span>  *chan <span class="Special">&lt;-</span> put *chan, <span class="Constant">first-free:offset</span>, free
@@ -181,18 +182,18 @@ if ('onhashchange' in window) {
 <span id="L119" class="LineNr">119 </span><span class="CommentedCode">#?   $print [read], 10/newline</span>
 <span id="L120" class="LineNr">120 </span>  <span class="Delimiter">{</span>
 <span id="L121" class="LineNr">121 </span><span class="CommentedCode">#?     $print [trying to acquire lock for reading], 10/newline</span>
-<span id="L122" class="LineNr">122 </span>    wait-for-reset-then-set lock
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> wait-for-reset-then-set lock
 <span id="L123" class="LineNr">123 </span><span class="CommentedCode">#?     $print [lock acquired for reading], 10/newline</span>
-<span id="L124" class="LineNr">124 </span>    empty?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
-<span id="L125" class="LineNr">125 </span>    <span class="muControl">break-unless</span> empty?
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> empty?
 <span id="L126" class="LineNr">126 </span><span class="CommentedCode">#?     $print [but channel is empty; relinquishing lock], 10/newline</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Comment"># channel is empty; relinquish lock and give a writer the opportunity to</span>
-<span id="L128" class="LineNr">128 </span>    <span class="Comment"># add to it</span>
-<span id="L129" class="LineNr">129 </span>    reset lock
-<span id="L130" class="LineNr">130 </span>    current-routine-is-blocked
-<span id="L131" class="LineNr">131 </span><span class="Constant">    <a href='075channel.mu.html#L131'>&lt;channel-read-empty&gt;</a></span>
-<span id="L132" class="LineNr">132 </span>    switch  <span class="Comment"># avoid spinlocking</span>
-<span id="L133" class="LineNr">133 </span>    <span class="muControl">loop</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Comment"># channel is empty; relinquish lock and give a writer the opportunity to</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Comment"># add to it</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> reset lock
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> current-routine-is-blocked
+<span id="L131" class="LineNr">131 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='075channel.mu.html#L131'>&lt;channel-read-empty&gt;</a></span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> switch  <span class="Comment"># avoid spinlocking</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Delimiter">}</span>
 <span id="L135" class="LineNr">135 </span>  current-routine-is-unblocked
 <span id="L136" class="LineNr">136 </span>  <span class="Comment"># pull result off</span>
@@ -205,11 +206,11 @@ if ('onhashchange' in window) {
 <span id="L143" class="LineNr">143 </span>  <span class="Comment"># mark its slot as empty</span>
 <span id="L144" class="LineNr">144 </span>  full <span class="Special">&lt;-</span> add full,<span class="Constant"> 1</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Delimiter">{</span>
-<span id="L146" class="LineNr">146 </span>    <span class="Comment"># wrap full around to 0 if necessary</span>
-<span id="L147" class="LineNr">147 </span>    len:num <span class="Special">&lt;-</span> length *circular-buffer
-<span id="L148" class="LineNr">148 </span>    at-end?:bool <span class="Special">&lt;-</span> greater-or-equal full, len
-<span id="L149" class="LineNr">149 </span>    <span class="muControl">break-unless</span> at-end?
-<span id="L150" class="LineNr">150 </span>    full <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Comment"># wrap full around to 0 if necessary</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> len:num <span class="Special">&lt;-</span> length *circular-buffer
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> at-end?:bool <span class="Special">&lt;-</span> greater-or-equal full, len
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> full <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Comment"># write back</span>
 <span id="L153" class="LineNr">153 </span>  *chan <span class="Special">&lt;-</span> put *chan, <span class="Constant">first-full:offset</span>, full
@@ -225,23 +226,23 @@ if ('onhashchange' in window) {
 <span id="L163" class="LineNr">163 </span>  <span class="Constant">load-ingredients</span>
 <span id="L164" class="LineNr">164 </span>  chan:&amp;:channel:_elem <span class="Special">&lt;-</span> get *in, <span class="Constant">chan:offset</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Delimiter">{</span>
-<span id="L166" class="LineNr">166 </span>    empty?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
-<span id="L167" class="LineNr">167 </span>    <span class="muControl">break-if</span> empty?
-<span id="L168" class="LineNr">168 </span>    _, _, in <span class="Special">&lt;-</span> read in
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> empty?
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> _, _, in <span class="Special">&lt;-</span> read in
 <span id="L169" class="LineNr">169 </span>  <span class="Delimiter">}</span>
 <span id="L170" class="LineNr">170 </span>]
 <span id="L171" class="LineNr">171 </span>
 <span id="L172" class="LineNr">172 </span><span class="muScenario">scenario</span> channel-initialization [
 <span id="L173" class="LineNr">173 </span>  run [
-<span id="L174" class="LineNr">174 </span>    <span class="Constant">local-scope</span>
-<span id="L175" class="LineNr">175 </span>    source:&amp;:source:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
-<span id="L176" class="LineNr">176 </span>    chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
-<span id="L177" class="LineNr">177 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
-<span id="L178" class="LineNr">178 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> source:&amp;:source:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
 <span id="L179" class="LineNr">179 </span>  ]
 <span id="L180" class="LineNr">180 </span>  memory-should-contain [
-<span id="L181" class="LineNr">181 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-full</span>
-<span id="L182" class="LineNr">182 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-free</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-full</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-free</span>
 <span id="L183" class="LineNr">183 </span>  ]
 <span id="L184" class="LineNr">184 </span>]
 <span id="L185" class="LineNr">185 </span>
@@ -249,14 +250,14 @@ if ('onhashchange' in window) {
 <span id="L187" class="LineNr">187 </span>  <span class="Constant">local-scope</span>
 <span id="L188" class="LineNr">188 </span>  _, sink:&amp;:sink:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
 <span id="L189" class="LineNr">189 </span>  run [
-<span id="L190" class="LineNr">190 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
-<span id="L191" class="LineNr">191 </span>    chan:&amp;:channel:num <span class="Special">&lt;-</span> get *sink, <span class="Constant">chan:offset</span>
-<span id="L192" class="LineNr">192 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
-<span id="L193" class="LineNr">193 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> chan:&amp;:channel:num <span class="Special">&lt;-</span> get *sink, <span class="Constant">chan:offset</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
 <span id="L194" class="LineNr">194 </span>  ]
 <span id="L195" class="LineNr">195 </span>  memory-should-contain [
-<span id="L196" class="LineNr">196 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-full</span>
-<span id="L197" class="LineNr">197 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-free</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-full</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-free</span>
 <span id="L198" class="LineNr">198 </span>  ]
 <span id="L199" class="LineNr">199 </span>]
 <span id="L200" class="LineNr">200 </span>
@@ -265,14 +266,14 @@ if ('onhashchange' in window) {
 <span id="L203" class="LineNr">203 </span>  source:&amp;:source:num, sink:&amp;:sink:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
 <span id="L204" class="LineNr">204 </span>  sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
 <span id="L205" class="LineNr">205 </span>  run [
-<span id="L206" class="LineNr">206 </span>    _, _, source <span class="Special">&lt;-</span> read source
-<span id="L207" class="LineNr">207 </span>    chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
-<span id="L208" class="LineNr">208 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
-<span id="L209" class="LineNr">209 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> _, _, source <span class="Special">&lt;-</span> read source
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
 <span id="L210" class="LineNr">210 </span>  ]
 <span id="L211" class="LineNr">211 </span>  memory-should-contain [
-<span id="L212" class="LineNr">212 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-full</span>
-<span id="L213" class="LineNr">213 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-free</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-full</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-free</span>
 <span id="L214" class="LineNr">214 </span>  ]
 <span id="L215" class="LineNr">215 </span>]
 <span id="L216" class="LineNr">216 </span>
@@ -285,35 +286,35 @@ if ('onhashchange' in window) {
 <span id="L223" class="LineNr">223 </span>  sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
 <span id="L224" class="LineNr">224 </span>  _, _, source <span class="Special">&lt;-</span> read source
 <span id="L225" class="LineNr">225 </span>  run [
-<span id="L226" class="LineNr">226 </span>    <span class="Comment"># first-free will now be 1</span>
-<span id="L227" class="LineNr">227 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
-<span id="L228" class="LineNr">228 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
-<span id="L229" class="LineNr">229 </span>    <span class="Comment"># write second value, verify that first-free wraps</span>
-<span id="L230" class="LineNr">230 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
-<span id="L231" class="LineNr">231 </span>    20:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
-<span id="L232" class="LineNr">232 </span>    <span class="Comment"># read second value, verify that first-full wraps</span>
-<span id="L233" class="LineNr">233 </span>    _, _, source <span class="Special">&lt;-</span> read source
-<span id="L234" class="LineNr">234 </span>    30:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Comment"># first-free will now be 1</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="Comment"># write second value, verify that first-free wraps</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> 20:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <span class="Comment"># read second value, verify that first-full wraps</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> _, _, source <span class="Special">&lt;-</span> read source
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> 30:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
 <span id="L235" class="LineNr">235 </span>  ]
 <span id="L236" class="LineNr">236 </span>  memory-should-contain [
-<span id="L237" class="LineNr">237 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-free after first write</span>
-<span id="L238" class="LineNr">238 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-full after first read</span>
-<span id="L239" class="LineNr">239 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-free after second write, wrapped</span>
-<span id="L240" class="LineNr">240 </span>   <span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-full after second read, wrapped</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-free after first write</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first-full after first read</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-free after second write, wrapped</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span><span class="Constant"> 30</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first-full after second read, wrapped</span>
 <span id="L241" class="LineNr">241 </span>  ]
 <span id="L242" class="LineNr">242 </span>]
 <span id="L243" class="LineNr">243 </span>
 <span id="L244" class="LineNr">244 </span><span class="muScenario">scenario</span> channel-new-empty-not-full [
 <span id="L245" class="LineNr">245 </span>  run [
-<span id="L246" class="LineNr">246 </span>    <span class="Constant">local-scope</span>
-<span id="L247" class="LineNr">247 </span>    source:&amp;:source:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
-<span id="L248" class="LineNr">248 </span>    chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
-<span id="L249" class="LineNr">249 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
-<span id="L250" class="LineNr">250 </span>    11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> source:&amp;:source:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> 11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
 <span id="L251" class="LineNr">251 </span>  ]
 <span id="L252" class="LineNr">252 </span>  memory-should-contain [
-<span id="L253" class="LineNr">253 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># empty?</span>
-<span id="L254" class="LineNr">254 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># full?</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># empty?</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># full?</span>
 <span id="L255" class="LineNr">255 </span>  ]
 <span id="L256" class="LineNr">256 </span>]
 <span id="L257" class="LineNr">257 </span>
@@ -322,13 +323,13 @@ if ('onhashchange' in window) {
 <span id="L260" class="LineNr">260 </span>  source:&amp;:source:num, sink:&amp;:sink:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">3/capacity</span>
 <span id="L261" class="LineNr">261 </span>  chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
 <span id="L262" class="LineNr">262 </span>  run [
-<span id="L263" class="LineNr">263 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
-<span id="L264" class="LineNr">264 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
-<span id="L265" class="LineNr">265 </span>    11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> 11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
 <span id="L266" class="LineNr">266 </span>  ]
 <span id="L267" class="LineNr">267 </span>  memory-should-contain [
-<span id="L268" class="LineNr">268 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty?</span>
-<span id="L269" class="LineNr">269 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># full?</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty?</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># full?</span>
 <span id="L270" class="LineNr">270 </span>  ]
 <span id="L271" class="LineNr">271 </span>]
 <span id="L272" class="LineNr">272 </span>
@@ -337,13 +338,13 @@ if ('onhashchange' in window) {
 <span id="L275" class="LineNr">275 </span>  source:&amp;:source:num, sink:&amp;:sink:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">1/capacity</span>
 <span id="L276" class="LineNr">276 </span>  chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
 <span id="L277" class="LineNr">277 </span>  run [
-<span id="L278" class="LineNr">278 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
-<span id="L279" class="LineNr">279 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
-<span id="L280" class="LineNr">280 </span>    11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> 11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
 <span id="L281" class="LineNr">281 </span>  ]
 <span id="L282" class="LineNr">282 </span>  memory-should-contain [
-<span id="L283" class="LineNr">283 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty?</span>
-<span id="L284" class="LineNr">284 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># full?</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># empty?</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># full?</span>
 <span id="L285" class="LineNr">285 </span>  ]
 <span id="L286" class="LineNr">286 </span>]
 <span id="L287" class="LineNr">287 </span>
@@ -353,13 +354,13 @@ if ('onhashchange' in window) {
 <span id="L291" class="LineNr">291 </span>  chan:&amp;:channel:num <span class="Special">&lt;-</span> get *source, <span class="Constant">chan:offset</span>
 <span id="L292" class="LineNr">292 </span>  sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 34</span>
 <span id="L293" class="LineNr">293 </span>  run [
-<span id="L294" class="LineNr">294 </span>    _, _, source <span class="Special">&lt;-</span> read source
-<span id="L295" class="LineNr">295 </span>    10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
-<span id="L296" class="LineNr">296 </span>    11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> _, _, source <span class="Special">&lt;-</span> read source
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> chan
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> 11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='075channel.mu.html#L361'>channel-full?</a> chan
 <span id="L297" class="LineNr">297 </span>  ]
 <span id="L298" class="LineNr">298 </span>  memory-should-contain [
-<span id="L299" class="LineNr">299 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># empty?</span>
-<span id="L300" class="LineNr">300 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># full?</span>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># empty?</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># full?</span>
 <span id="L301" class="LineNr">301 </span>  ]
 <span id="L302" class="LineNr">302 </span>]
 <span id="L303" class="LineNr">303 </span>
@@ -399,10 +400,10 @@ if ('onhashchange' in window) {
 <span id="L337" class="LineNr">337 </span><span class="muRecipe">after</span> <span class="Constant"><a href='075channel.mu.html#L131'>&lt;channel-read-empty&gt;</a></span> [
 <span id="L338" class="LineNr">338 </span>  closed?:bool <span class="Special">&lt;-</span> get *chan, <span class="Constant">closed?:offset</span>
 <span id="L339" class="LineNr">339 </span>  <span class="Delimiter">{</span>
-<span id="L340" class="LineNr">340 </span>    <span class="muControl">break-unless</span> closed?
-<span id="L341" class="LineNr">341 </span>    empty-result:&amp;:_elem <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>
-<span id="L342" class="LineNr">342 </span>    current-routine-is-unblocked
-<span id="L343" class="LineNr">343 </span>    <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> closed?
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span> empty-result:&amp;:_elem <span class="Special">&lt;-</span> new <span class="Constant">_elem:type</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span> current-routine-is-unblocked
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> *empty-result, <span class="Constant">1/true</span>
 <span id="L344" class="LineNr">344 </span>  <span class="Delimiter">}</span>
 <span id="L345" class="LineNr">345 </span>]
 <span id="L346" class="LineNr">346 </span>
@@ -427,11 +428,11 @@ if ('onhashchange' in window) {
 <span id="L365" class="LineNr">365 </span>  tmp:num <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-free:offset</span>
 <span id="L366" class="LineNr">366 </span>  tmp <span class="Special">&lt;-</span> add tmp,<span class="Constant"> 1</span>
 <span id="L367" class="LineNr">367 </span>  <span class="Delimiter">{</span>
-<span id="L368" class="LineNr">368 </span>    <span class="Comment"># if tmp == chan.capacity, tmp = 0</span>
-<span id="L369" class="LineNr">369 </span>    len:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L379'>capacity</a> chan
-<span id="L370" class="LineNr">370 </span>    at-end?:bool <span class="Special">&lt;-</span> greater-or-equal tmp, len
-<span id="L371" class="LineNr">371 </span>    <span class="muControl">break-unless</span> at-end?
-<span id="L372" class="LineNr">372 </span>    tmp <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span> <span class="Comment"># if tmp == chan.capacity, tmp = 0</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> len:num <span class="Special">&lt;-</span> <a href='075channel.mu.html#L379'>capacity</a> chan
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> at-end?:bool <span class="Special">&lt;-</span> greater-or-equal tmp, len
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span> tmp <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L373" class="LineNr">373 </span>  <span class="Delimiter">}</span>
 <span id="L374" class="LineNr">374 </span>  <span class="Comment"># return chan.first-full == tmp</span>
 <span id="L375" class="LineNr">375 </span>  full:num <span class="Special">&lt;-</span> get *chan, <span class="Constant">first-full:offset</span>
@@ -453,96 +454,96 @@ if ('onhashchange' in window) {
 <span id="L391" class="LineNr">391 </span>  <span class="Comment"># repeat forever</span>
 <span id="L392" class="LineNr">392 </span>  eof?:bool <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
 <span id="L393" class="LineNr">393 </span>  <span class="Delimiter">{</span>
-<span id="L394" class="LineNr">394 </span>    line:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a><span class="Constant"> 30</span>
-<span id="L395" class="LineNr">395 </span>    <span class="Comment"># read characters from 'in' until newline, copy into line</span>
-<span id="L396" class="LineNr">396 </span>    <span class="Delimiter">{</span>
-<span id="L397" class="LineNr">397 </span><span class="Constant">      +next-character</span>
-<span id="L398" class="LineNr">398 </span>      c:char, eof?:bool, in <span class="Special">&lt;-</span> read in
-<span id="L399" class="LineNr">399 </span>      <span class="muControl">break-if</span> eof?
-<span id="L400" class="LineNr">400 </span>      <span class="Comment"># drop a character on backspace</span>
-<span id="L401" class="LineNr">401 </span>      <span class="Delimiter">{</span>
-<span id="L402" class="LineNr">402 </span>        <span class="Comment"># special-case: if it's a backspace</span>
-<span id="L403" class="LineNr">403 </span>        backspace?:bool <span class="Special">&lt;-</span> equal c,<span class="Constant"> 8</span>
-<span id="L404" class="LineNr">404 </span>        <span class="muControl">break-unless</span> backspace?
-<span id="L405" class="LineNr">405 </span>        <span class="Comment"># drop previous character</span>
-<span id="L406" class="LineNr">406 </span>        <span class="Delimiter">{</span>
-<span id="L407" class="LineNr">407 </span>          buffer-length:num <span class="Special">&lt;-</span> get *line, <span class="Constant">length:offset</span>
-<span id="L408" class="LineNr">408 </span>          buffer-empty?:bool <span class="Special">&lt;-</span> equal buffer-length,<span class="Constant"> 0</span>
-<span id="L409" class="LineNr">409 </span>          <span class="muControl">break-if</span> buffer-empty?
-<span id="L410" class="LineNr">410 </span>          buffer-length <span class="Special">&lt;-</span> subtract buffer-length,<span class="Constant"> 1</span>
-<span id="L411" class="LineNr">411 </span>          *line <span class="Special">&lt;-</span> put *line, <span class="Constant">length:offset</span>, buffer-length
-<span id="L412" class="LineNr">412 </span>        <span class="Delimiter">}</span>
-<span id="L413" class="LineNr">413 </span>        <span class="Comment"># and don't append this one</span>
-<span id="L414" class="LineNr">414 </span>        <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L415" class="LineNr">415 </span>      <span class="Delimiter">}</span>
-<span id="L416" class="LineNr">416 </span>      <span class="Comment"># append anything else</span>
-<span id="L417" class="LineNr">417 </span>      line <span class="Special">&lt;-</span> append line, c
-<span id="L418" class="LineNr">418 </span>      line-done?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L419" class="LineNr">419 </span>      <span class="muControl">break-if</span> line-done?
-<span id="L420" class="LineNr">420 </span>      <span class="muControl">loop</span>
-<span id="L421" class="LineNr">421 </span>    <span class="Delimiter">}</span>
-<span id="L422" class="LineNr">422 </span>    <span class="Comment"># copy line into 'buffered-out'</span>
-<span id="L423" class="LineNr">423 </span>    i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
-<span id="L424" class="LineNr">424 </span>    line-contents:text <span class="Special">&lt;-</span> get *line, <span class="Constant">data:offset</span>
-<span id="L425" class="LineNr">425 </span>    max:num <span class="Special">&lt;-</span> get *line, <span class="Constant">length:offset</span>
-<span id="L426" class="LineNr">426 </span>    <span class="Delimiter">{</span>
-<span id="L427" class="LineNr">427 </span>      done?:bool <span class="Special">&lt;-</span> greater-or-equal i, max
-<span id="L428" class="LineNr">428 </span>      <span class="muControl">break-if</span> done?
-<span id="L429" class="LineNr">429 </span>      c:char <span class="Special">&lt;-</span> index *line-contents, i
-<span id="L430" class="LineNr">430 </span>      buffered-out <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> buffered-out, c
-<span id="L431" class="LineNr">431 </span>      i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L432" class="LineNr">432 </span>      <span class="muControl">loop</span>
-<span id="L433" class="LineNr">433 </span>    <span class="Delimiter">}</span>
-<span id="L434" class="LineNr">434 </span>    <span class="Delimiter">{</span>
-<span id="L435" class="LineNr">435 </span>      <span class="muControl">break-unless</span> eof?
-<span id="L436" class="LineNr">436 </span>      buffered-out <span class="Special">&lt;-</span> close buffered-out
-<span id="L437" class="LineNr">437 </span>      <span class="muControl">return</span>
-<span id="L438" class="LineNr">438 </span>    <span class="Delimiter">}</span>
-<span id="L439" class="LineNr">439 </span>    <span class="muControl">loop</span>
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span> line:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a><span class="Constant"> 30</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span> <span class="Comment"># read characters from 'in' until newline, copy into line</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L397" class="LineNr">397 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c:char, eof?:bool, in <span class="Special">&lt;-</span> read in
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> eof?
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># drop a character on backspace</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># special-case: if it's a backspace</span>
+<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> backspace?:bool <span class="Special">&lt;-</span> equal c,<span class="Constant"> 8</span>
+<span id="L404" class="LineNr">404 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> backspace?
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># drop previous character</span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> buffer-length:num <span class="Special">&lt;-</span> get *line, <span class="Constant">length:offset</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> buffer-empty?:bool <span class="Special">&lt;-</span> equal buffer-length,<span class="Constant"> 0</span>
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> buffer-empty?
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> buffer-length <span class="Special">&lt;-</span> subtract buffer-length,<span class="Constant"> 1</span>
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> *line <span class="Special">&lt;-</span> put *line, <span class="Constant">length:offset</span>, buffer-length
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># and don't append this one</span>
+<span id="L414" class="LineNr">414 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># append anything else</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> line <span class="Special">&lt;-</span> append line, c
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> line-done?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L419" class="LineNr">419 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> line-done?
+<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <span class="Comment"># copy line into 'buffered-out'</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span> i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> line-contents:text <span class="Special">&lt;-</span> get *line, <span class="Constant">data:offset</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span> max:num <span class="Special">&lt;-</span> get *line, <span class="Constant">length:offset</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, max
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *line-contents, i
+<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> buffered-out <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> buffered-out, c
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L435" class="LineNr">435 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> eof?
+<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> buffered-out <span class="Special">&lt;-</span> close buffered-out
+<span id="L437" class="LineNr">437 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">return</span>
+<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L440" class="LineNr">440 </span>  <span class="Delimiter">}</span>
 <span id="L441" class="LineNr">441 </span>]
 <span id="L442" class="LineNr">442 </span>
 <span id="L443" class="LineNr">443 </span><span class="muScenario">scenario</span> buffer-lines-blocks-until-newline [
 <span id="L444" class="LineNr">444 </span>  run [
-<span id="L445" class="LineNr">445 </span>    <span class="Constant">local-scope</span>
-<span id="L446" class="LineNr">446 </span>    source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">10/capacity</span>
-<span id="L447" class="LineNr">447 </span>    _, buffered-stdin:&amp;:sink:char/buffered-stdin <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">10/capacity</span>
-<span id="L448" class="LineNr">448 </span>    buffered-chan:&amp;:channel:char <span class="Special">&lt;-</span> get *buffered-stdin, <span class="Constant">chan:offset</span>
-<span id="L449" class="LineNr">449 </span>    empty?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
-<span id="L450" class="LineNr">450 </span>    assert empty?, <span class="Constant">[ </span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">10/capacity</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> _, buffered-stdin:&amp;:sink:char/buffered-stdin <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">10/capacity</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> buffered-chan:&amp;:channel:char <span class="Special">&lt;-</span> get *buffered-stdin, <span class="Constant">chan:offset</span>
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
+<span id="L450" class="LineNr">450 </span>  <span class="Conceal">¦</span> assert empty?, <span class="Constant">[ </span>
 <span id="L451" class="LineNr">451 </span><span class="Constant">F buffer-lines-blocks-until-newline: channel should be empty after init]</span>
-<span id="L452" class="LineNr">452 </span>    <span class="Comment"># buffer stdin into buffered-stdin, try to read from buffered-stdin</span>
-<span id="L453" class="LineNr">453 </span>    buffer-routine:num <span class="Special">&lt;-</span> start-running <a href='075channel.mu.html#L388'>buffer-lines</a>, source, buffered-stdin
-<span id="L454" class="LineNr">454 </span>    wait-for-routine-to-block buffer-routine
-<span id="L455" class="LineNr">455 </span>    empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
-<span id="L456" class="LineNr">456 </span>    assert empty?:bool, <span class="Constant">[ </span>
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span> <span class="Comment"># buffer stdin into buffered-stdin, try to read from buffered-stdin</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span> buffer-routine:num <span class="Special">&lt;-</span> start-running <a href='075channel.mu.html#L388'>buffer-lines</a>, source, buffered-stdin
+<span id="L454" class="LineNr">454 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block buffer-routine
+<span id="L455" class="LineNr">455 </span>  <span class="Conceal">¦</span> empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span> assert empty?:bool, <span class="Constant">[ </span>
 <span id="L457" class="LineNr">457 </span><span class="Constant">F buffer-lines-blocks-until-newline: channel should be empty after <a href='075channel.mu.html#L388'>buffer-lines</a> bring-up]</span>
-<span id="L458" class="LineNr">458 </span>    <span class="Comment"># write 'a'</span>
-<span id="L459" class="LineNr">459 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
-<span id="L460" class="LineNr">460 </span>    restart buffer-routine
-<span id="L461" class="LineNr">461 </span>    wait-for-routine-to-block buffer-routine
-<span id="L462" class="LineNr">462 </span>    empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
-<span id="L463" class="LineNr">463 </span>    assert empty?:bool, <span class="Constant">[ </span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span> <span class="Comment"># write 'a'</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> restart buffer-routine
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block buffer-routine
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span> assert empty?:bool, <span class="Constant">[ </span>
 <span id="L464" class="LineNr">464 </span><span class="Constant">F buffer-lines-blocks-until-newline: channel should be empty after writing 'a']</span>
-<span id="L465" class="LineNr">465 </span>    <span class="Comment"># write 'b'</span>
-<span id="L466" class="LineNr">466 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">98/b</span>
-<span id="L467" class="LineNr">467 </span>    restart buffer-routine
-<span id="L468" class="LineNr">468 </span>    wait-for-routine-to-block buffer-routine
-<span id="L469" class="LineNr">469 </span>    empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
-<span id="L470" class="LineNr">470 </span>    assert empty?:bool, <span class="Constant">[ </span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> <span class="Comment"># write 'b'</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">98/b</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> restart buffer-routine
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block buffer-routine
+<span id="L469" class="LineNr">469 </span>  <span class="Conceal">¦</span> empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
+<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span> assert empty?:bool, <span class="Constant">[ </span>
 <span id="L471" class="LineNr">471 </span><span class="Constant">F buffer-lines-blocks-until-newline: channel should be empty after writing 'b']</span>
-<span id="L472" class="LineNr">472 </span>    <span class="Comment"># write newline</span>
-<span id="L473" class="LineNr">473 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">10/newline</span>
-<span id="L474" class="LineNr">474 </span>    restart buffer-routine
-<span id="L475" class="LineNr">475 </span>    wait-for-routine-to-block buffer-routine
-<span id="L476" class="LineNr">476 </span>    empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
-<span id="L477" class="LineNr">477 </span>    data-emitted?:bool <span class="Special">&lt;-</span> not empty?
-<span id="L478" class="LineNr">478 </span>    assert data-emitted?, <span class="Constant">[ </span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> <span class="Comment"># write newline</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">10/newline</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> restart buffer-routine
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block buffer-routine
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> empty? <span class="Special">&lt;-</span> <a href='075channel.mu.html#L350'>channel-empty?</a> buffered-chan
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> data-emitted?:bool <span class="Special">&lt;-</span> not empty?
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span> assert data-emitted?, <span class="Constant">[ </span>
 <span id="L479" class="LineNr">479 </span><span class="Constant">F buffer-lines-blocks-until-newline: channel should contain data after writing newline]</span>
-<span id="L480" class="LineNr">480 </span>    trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
 <span id="L481" class="LineNr">481 </span>  ]
 <span id="L482" class="LineNr">482 </span>  trace-should-contain [
-<span id="L483" class="LineNr">483 </span>    test: reached end
+<span id="L483" class="LineNr">483 </span>  <span class="Conceal">¦</span> test: reached end
 <span id="L484" class="LineNr">484 </span>  ]
 <span id="L485" class="LineNr">485 </span>]
 <span id="L486" class="LineNr">486 </span>
@@ -551,10 +552,10 @@ if ('onhashchange' in window) {
 <span id="L489" class="LineNr">489 </span>  <span class="Constant">load-ingredients</span>
 <span id="L490" class="LineNr">490 </span>  buf:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a><span class="Constant"> 30</span>
 <span id="L491" class="LineNr">491 </span>  <span class="Delimiter">{</span>
-<span id="L492" class="LineNr">492 </span>    c:char, done?:bool <span class="Special">&lt;-</span> read source
-<span id="L493" class="LineNr">493 </span>    <span class="muControl">break-if</span> done?
-<span id="L494" class="LineNr">494 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L495" class="LineNr">495 </span>    <span class="muControl">loop</span>
+<span id="L492" class="LineNr">492 </span>  <span class="Conceal">¦</span> c:char, done?:bool <span class="Special">&lt;-</span> read source
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Delimiter">}</span>
 <span id="L497" class="LineNr">497 </span>  result <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> buf
 <span id="L498" class="LineNr">498 </span>]
diff --git a/html/080display.cc.html b/html/080display.cc.html
index 38129417..4c2c5e74 100644
--- a/html/080display.cc.html
+++ b/html/080display.cc.html
@@ -16,7 +16,7 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .SalientComment { color: #00ffff; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
@@ -24,6 +24,7 @@ a:hover { text-decoration: underline; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .PreProc { color: #800080; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -71,21 +72,21 @@ if ('onhashchange' in window) {
 <span id="L11" class="LineNr"> 11 </span>
 <span id="L12" class="LineNr"> 12 </span><span class="Delimiter">:(before &quot;End Includes&quot;)</span>
 <span id="L13" class="LineNr"> 13 </span><span class="PreProc">#define CHECK_SCREEN \</span>
-<span id="L14" class="LineNr"> 14 </span><span class="PreProc">    </span><span class="Normal">if</span><span class="PreProc"> (!tb_is_active()) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
-<span id="L15" class="LineNr"> 15 </span><span class="PreProc">      </span><span class="Normal">if</span><span class="PreProc"> (Run_tests) \</span>
-<span id="L16" class="LineNr"> 16 </span><span class="PreProc">        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to print to real screen in a test!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L17" class="LineNr"> 17 </span><span class="PreProc">      </span><span class="Normal">else</span><span class="PreProc"> \</span>
-<span id="L18" class="LineNr"> 18 </span><span class="PreProc">        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to print to real screen before 'open-console' or after 'close-console'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L19" class="LineNr"> 19 </span><span class="PreProc">      </span><span class="Identifier">break</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L20" class="LineNr"> 20 </span><span class="PreProc">    </span><span class="Delimiter">}</span>
+<span id="L14" class="LineNr"> 14 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Normal">if</span><span class="PreProc"> (!tb_is_active()) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
+<span id="L15" class="LineNr"> 15 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Normal">if</span><span class="PreProc"> (Run_tests) \</span>
+<span id="L16" class="LineNr"> 16 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to print to real screen in a test!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L17" class="LineNr"> 17 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Normal">else</span><span class="PreProc"> \</span>
+<span id="L18" class="LineNr"> 18 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to print to real screen before 'open-console' or after 'close-console'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L19" class="LineNr"> 19 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Identifier">break</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L20" class="LineNr"> 20 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Delimiter">}</span>
 <span id="L21" class="LineNr"> 21 </span><span class="PreProc">#define CHECK_CONSOLE \</span>
-<span id="L22" class="LineNr"> 22 </span><span class="PreProc">    </span><span class="Normal">if</span><span class="PreProc"> (!tb_is_active()) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
-<span id="L23" class="LineNr"> 23 </span><span class="PreProc">      </span><span class="Normal">if</span><span class="PreProc"> (Run_tests) \</span>
-<span id="L24" class="LineNr"> 24 </span><span class="PreProc">        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to read event from real keyboard/mouse in a test!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L25" class="LineNr"> 25 </span><span class="PreProc">      </span><span class="Normal">else</span><span class="PreProc"> \</span>
-<span id="L26" class="LineNr"> 26 </span><span class="PreProc">        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to read event from real keyboard/mouse before 'open-console' or after 'close-console'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L27" class="LineNr"> 27 </span><span class="PreProc">      </span><span class="Identifier">break</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
-<span id="L28" class="LineNr"> 28 </span><span class="PreProc">    </span><span class="Delimiter">}</span>
+<span id="L22" class="LineNr"> 22 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Normal">if</span><span class="PreProc"> (!tb_is_active()) </span><span class="Delimiter">{</span><span class="PreProc"> \</span>
+<span id="L23" class="LineNr"> 23 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Normal">if</span><span class="PreProc"> (Run_tests) \</span>
+<span id="L24" class="LineNr"> 24 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to read event from real keyboard/mouse in a test!</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L25" class="LineNr"> 25 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Normal">else</span><span class="PreProc"> \</span>
+<span id="L26" class="LineNr"> 26 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; maybe(current_recipe_name()) &lt;&lt; </span><span class="Constant">&quot;tried to read event from real keyboard/mouse before 'open-console' or after 'close-console'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="PreProc"> &lt;&lt; end()</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L27" class="LineNr"> 27 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Identifier">break</span><span class="Delimiter">;</span><span class="PreProc"> \</span>
+<span id="L28" class="LineNr"> 28 </span><span class="PreProc">  </span><span class="Conceal">¦</span><span class="PreProc"> </span><span class="Delimiter">}</span>
 <span id="L29" class="LineNr"> 29 </span>
 <span id="L30" class="LineNr"> 30 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
 <span id="L31" class="LineNr"> 31 </span>OPEN_CONSOLE<span class="Delimiter">,</span>
@@ -103,9 +104,9 @@ if ('onhashchange' in window) {
 <span id="L43" class="LineNr"> 43 </span>  <span class="Normal">int</span> height = tb_height<span class="Delimiter">();</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>width &gt; <span class="Constant">222</span> || height &gt; <span class="Constant">222</span><span class="Delimiter">)</span> tb_shutdown<span class="Delimiter">();</span>
 <span id="L45" class="LineNr"> 45 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>width &gt; <span class="Constant">222</span><span class="Delimiter">)</span>
-<span id="L46" class="LineNr"> 46 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;sorry, Mu doesn't support windows wider than 222 characters in console mode. Please resize your window.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;sorry, Mu doesn't support windows wider than 222 characters in console mode. Please resize your window.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>height &gt; <span class="Constant">222</span><span class="Delimiter">)</span>
-<span id="L48" class="LineNr"> 48 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;sorry, Mu doesn't support windows taller than 222 characters in console mode. Please resize your window.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;sorry, Mu doesn't support windows taller than 222 characters in console mode. Please resize your window.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L50" class="LineNr"> 50 </span><span class="Delimiter">}</span>
 <span id="L51" class="LineNr"> 51 </span>
@@ -170,7 +171,7 @@ if ('onhashchange' in window) {
 <span id="L110" class="LineNr">110 </span>  <a href='080display.cc.html#L13'>CHECK_SCREEN</a><span class="Delimiter">;</span>
 <span id="L111" class="LineNr">111 </span>  <span class="Normal">int</span> width = tb_width<span class="Delimiter">();</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> x = Display_column<span class="Delimiter">;</span>  x &lt; width<span class="Delimiter">;</span>  ++x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L113" class="LineNr">113 </span>    tb_change_cell<span class="Delimiter">(</span>x<span class="Delimiter">,</span> Display_row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> TB_WHITE<span class="Delimiter">,</span> TB_BLACK<span class="Delimiter">);</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> tb_change_cell<span class="Delimiter">(</span>x<span class="Delimiter">,</span> Display_row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> TB_WHITE<span class="Delimiter">,</span> TB_BLACK<span class="Delimiter">);</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Delimiter">}</span>
 <span id="L115" class="LineNr">115 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
@@ -184,24 +185,24 @@ if ('onhashchange' in window) {
 <span id="L124" class="LineNr">124 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L125" class="LineNr">125 </span><span class="Normal">case</span> PRINT_CHARACTER_TO_DISPLAY: <span class="Delimiter">{</span>
 <span id="L126" class="LineNr">126 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L127" class="LineNr">127 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'print-character-to-display' requires at least one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L128" class="LineNr">128 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'print-character-to-display' requires at least one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L129" class="LineNr">129 </span>  <span class="Delimiter">}</span>
 <span id="L130" class="LineNr">130 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L131" class="LineNr">131 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'print-character-to-display' should be a character, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L132" class="LineNr">132 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'print-character-to-display' should be a character, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L133" class="LineNr">133 </span>  <span class="Delimiter">}</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L135" class="LineNr">135 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L136" class="LineNr">136 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'print-character-to-display' should be a foreground color number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L137" class="LineNr">137 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L138" class="LineNr">138 </span>    <span class="Delimiter">}</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'print-character-to-display' should be a foreground color number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
 <span id="L140" class="LineNr">140 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L141" class="LineNr">141 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L142" class="LineNr">142 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;third ingredient of 'print-character-to-display' should be a background color number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L143" class="LineNr">143 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L144" class="LineNr">144 </span>    <span class="Delimiter">}</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;third ingredient of 'print-character-to-display' should be a background color number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L145" class="LineNr">145 </span>  <span class="Delimiter">}</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L147" class="LineNr">147 </span><span class="Delimiter">}</span>
@@ -214,35 +215,35 @@ if ('onhashchange' in window) {
 <span id="L154" class="LineNr">154 </span>  <span class="Normal">int</span> c = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L155" class="LineNr">155 </span>  <span class="Normal">int</span> color = TB_BLACK<span class="Delimiter">;</span>
 <span id="L156" class="LineNr">156 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L157" class="LineNr">157 </span>    color = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> color = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L158" class="LineNr">158 </span>  <span class="Delimiter">}</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Normal">int</span> bg_color = TB_BLACK<span class="Delimiter">;</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L161" class="LineNr">161 </span>    bg_color = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L162" class="LineNr">162 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>bg_color == <span class="Constant">0</span><span class="Delimiter">)</span> bg_color = TB_BLACK<span class="Delimiter">;</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> bg_color = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>bg_color == <span class="Constant">0</span><span class="Delimiter">)</span> bg_color = TB_BLACK<span class="Delimiter">;</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Delimiter">}</span>
 <span id="L164" class="LineNr">164 </span>  tb_change_cell<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">,</span> c<span class="Delimiter">,</span> color<span class="Delimiter">,</span> bg_color<span class="Delimiter">);</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span> || c == <span class="cSpecial">'\r'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L166" class="LineNr">166 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; height-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L167" class="LineNr">167 </span>      Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L168" class="LineNr">168 </span>      ++Display_row<span class="Delimiter">;</span>
-<span id="L169" class="LineNr">169 </span>      tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L170" class="LineNr">170 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
-<span id="L171" class="LineNr">171 </span>    <span class="Delimiter">}</span>
-<span id="L172" class="LineNr">172 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; height-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++Display_row<span class="Delimiter">;</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Delimiter">}</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\b'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L175" class="LineNr">175 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Display_column &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L176" class="LineNr">176 </span>      tb_change_cell<span class="Delimiter">(</span>Display_column-<span class="Constant">1</span><span class="Delimiter">,</span> Display_row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> color<span class="Delimiter">,</span> bg_color<span class="Delimiter">);</span>
-<span id="L177" class="LineNr">177 </span>      --Display_column<span class="Delimiter">;</span>
-<span id="L178" class="LineNr">178 </span>      tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L179" class="LineNr">179 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
-<span id="L180" class="LineNr">180 </span>    <span class="Delimiter">}</span>
-<span id="L181" class="LineNr">181 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Display_column &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_change_cell<span class="Delimiter">(</span>Display_column-<span class="Constant">1</span><span class="Delimiter">,</span> Display_row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> color<span class="Delimiter">,</span> bg_color<span class="Delimiter">);</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Display_column<span class="Delimiter">;</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Delimiter">}</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_column &lt; width-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L184" class="LineNr">184 </span>    ++Display_column<span class="Delimiter">;</span>
-<span id="L185" class="LineNr">185 </span>    tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> ++Display_column<span class="Delimiter">;</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
 <span id="L186" class="LineNr">186 </span>  <span class="Delimiter">}</span>
 <span id="L187" class="LineNr">187 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
 <span id="L188" class="LineNr">188 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
@@ -272,16 +273,16 @@ if ('onhashchange' in window) {
 <span id="L212" class="LineNr">212 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L213" class="LineNr">213 </span><span class="Normal">case</span> MOVE_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L215" class="LineNr">215 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'move-cursor-on-display' requires two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'move-cursor-on-display' requires two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Delimiter">}</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L219" class="LineNr">219 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'move-cursor-on-display' should be a row number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L220" class="LineNr">220 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'move-cursor-on-display' should be a row number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Delimiter">}</span>
 <span id="L222" class="LineNr">222 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L223" class="LineNr">223 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'move-cursor-on-display' should be a column number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L224" class="LineNr">224 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'move-cursor-on-display' should be a column number, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L225" class="LineNr">225 </span>  <span class="Delimiter">}</span>
 <span id="L226" class="LineNr">226 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L227" class="LineNr">227 </span><span class="Delimiter">}</span>
@@ -309,9 +310,9 @@ if ('onhashchange' in window) {
 <span id="L249" class="LineNr">249 </span>  <span class="Normal">int</span> h=tb_height<span class="Delimiter">();</span>
 <span id="L250" class="LineNr">250 </span>  <span class="Normal">int</span> height = <span class="Delimiter">(</span>h &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> ? h : <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L251" class="LineNr">251 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; height-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L252" class="LineNr">252 </span>    ++Display_row<span class="Delimiter">;</span>
-<span id="L253" class="LineNr">253 </span>    tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L254" class="LineNr">254 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> ++Display_row<span class="Delimiter">;</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
 <span id="L255" class="LineNr">255 </span>  <span class="Delimiter">}</span>
 <span id="L256" class="LineNr">256 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L257" class="LineNr">257 </span><span class="Delimiter">}</span>
@@ -328,9 +329,9 @@ if ('onhashchange' in window) {
 <span id="L268" class="LineNr">268 </span><span class="Normal">case</span> MOVE_CURSOR_UP_ON_DISPLAY: <span class="Delimiter">{</span>
 <span id="L269" class="LineNr">269 </span>  <a href='080display.cc.html#L13'>CHECK_SCREEN</a><span class="Delimiter">;</span>
 <span id="L270" class="LineNr">270 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L271" class="LineNr">271 </span>    --Display_row<span class="Delimiter">;</span>
-<span id="L272" class="LineNr">272 </span>    tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L273" class="LineNr">273 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> --Display_row<span class="Delimiter">;</span>
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Delimiter">}</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L276" class="LineNr">276 </span><span class="Delimiter">}</span>
@@ -349,9 +350,9 @@ if ('onhashchange' in window) {
 <span id="L289" class="LineNr">289 </span>  <span class="Normal">int</span> w=tb_width<span class="Delimiter">();</span>
 <span id="L290" class="LineNr">290 </span>  <span class="Normal">int</span> width = <span class="Delimiter">(</span>w &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> ? w : <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L291" class="LineNr">291 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_column &lt; width-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L292" class="LineNr">292 </span>    ++Display_column<span class="Delimiter">;</span>
-<span id="L293" class="LineNr">293 </span>    tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L294" class="LineNr">294 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Conceal">¦</span> ++Display_column<span class="Delimiter">;</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
 <span id="L295" class="LineNr">295 </span>  <span class="Delimiter">}</span>
 <span id="L296" class="LineNr">296 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L297" class="LineNr">297 </span><span class="Delimiter">}</span>
@@ -368,9 +369,9 @@ if ('onhashchange' in window) {
 <span id="L308" class="LineNr">308 </span><span class="Normal">case</span> MOVE_CURSOR_LEFT_ON_DISPLAY: <span class="Delimiter">{</span>
 <span id="L309" class="LineNr">309 </span>  <a href='080display.cc.html#L13'>CHECK_SCREEN</a><span class="Delimiter">;</span>
 <span id="L310" class="LineNr">310 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_column &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L311" class="LineNr">311 </span>    --Display_column<span class="Delimiter">;</span>
-<span id="L312" class="LineNr">312 </span>    tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L313" class="LineNr">313 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> --Display_column<span class="Delimiter">;</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Delimiter">}</span>
 <span id="L315" class="LineNr">315 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L316" class="LineNr">316 </span><span class="Delimiter">}</span>
@@ -515,52 +516,52 @@ if ('onhashchange' in window) {
 <span id="L455" class="LineNr">455 </span>  tb_event event<span class="Delimiter">;</span>
 <span id="L456" class="LineNr">456 </span>  <span class="Normal">int</span> event_type = tb_peek_event<span class="Delimiter">(</span>&amp;event<span class="Delimiter">,</span> <span class="Constant">5</span><span class="Comment">/*</span><span class="Comment">ms</span><span class="Comment">*/</span><span class="Delimiter">);</span>
 <span id="L457" class="LineNr">457 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_KEY &amp;&amp; event<span class="Delimiter">.</span>ch<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L458" class="LineNr">458 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">text event</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L459" class="LineNr">459 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>ch<span class="Delimiter">);</span>
-<span id="L460" class="LineNr">460 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L461" class="LineNr">461 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L462" class="LineNr">462 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
-<span id="L463" class="LineNr">463 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">text event</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>ch<span class="Delimiter">);</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L464" class="LineNr">464 </span>  <span class="Delimiter">}</span>
 <span id="L465" class="LineNr">465 </span>  <span class="Comment">// treat keys within ascii as unicode characters</span>
 <span id="L466" class="LineNr">466 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_KEY &amp;&amp; event<span class="Delimiter">.</span>key &lt; <span class="Constant">0xff</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L467" class="LineNr">467 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">text event</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L468" class="LineNr">468 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>key == TB_KEY_CTRL_C<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L469" class="LineNr">469 </span>      tb_shutdown<span class="Delimiter">();</span>
-<span id="L470" class="LineNr">470 </span>      exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L471" class="LineNr">471 </span>    <span class="Delimiter">}</span>
-<span id="L472" class="LineNr">472 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>key == TB_KEY_BACKSPACE2<span class="Delimiter">)</span> event<span class="Delimiter">.</span>key = TB_KEY_BACKSPACE<span class="Delimiter">;</span>
-<span id="L473" class="LineNr">473 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>key == TB_KEY_CARRIAGE_RETURN<span class="Delimiter">)</span> event<span class="Delimiter">.</span>key = TB_KEY_NEWLINE<span class="Delimiter">;</span>
-<span id="L474" class="LineNr">474 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>key<span class="Delimiter">);</span>
-<span id="L475" class="LineNr">475 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L476" class="LineNr">476 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L477" class="LineNr">477 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
-<span id="L478" class="LineNr">478 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">text event</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>key == TB_KEY_CTRL_C<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L469" class="LineNr">469 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_shutdown<span class="Delimiter">();</span>
+<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>key == TB_KEY_BACKSPACE2<span class="Delimiter">)</span> event<span class="Delimiter">.</span>key = TB_KEY_BACKSPACE<span class="Delimiter">;</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>key == TB_KEY_CARRIAGE_RETURN<span class="Delimiter">)</span> event<span class="Delimiter">.</span>key = TB_KEY_NEWLINE<span class="Delimiter">;</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>key<span class="Delimiter">);</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L479" class="LineNr">479 </span>  <span class="Delimiter">}</span>
 <span id="L480" class="LineNr">480 </span>  <span class="Comment">// keys outside ascii aren't unicode characters but arbitrary termbox inventions</span>
 <span id="L481" class="LineNr">481 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_KEY<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L482" class="LineNr">482 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">keycode event</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L483" class="LineNr">483 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>key<span class="Delimiter">);</span>
-<span id="L484" class="LineNr">484 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L485" class="LineNr">485 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L486" class="LineNr">486 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
-<span id="L487" class="LineNr">487 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L482" class="LineNr">482 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">keycode event</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L483" class="LineNr">483 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>key<span class="Delimiter">);</span>
+<span id="L484" class="LineNr">484 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
+<span id="L487" class="LineNr">487 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L488" class="LineNr">488 </span>  <span class="Delimiter">}</span>
 <span id="L489" class="LineNr">489 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_MOUSE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L490" class="LineNr">490 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">touch event</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L491" class="LineNr">491 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>key<span class="Delimiter">);</span>  <span class="Comment">// which button, etc.</span>
-<span id="L492" class="LineNr">492 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>y<span class="Delimiter">);</span>  <span class="Comment">// row</span>
-<span id="L493" class="LineNr">493 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>x<span class="Delimiter">);</span>  <span class="Comment">// column</span>
-<span id="L494" class="LineNr">494 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
-<span id="L495" class="LineNr">495 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L490" class="LineNr">490 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">touch event</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L491" class="LineNr">491 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>key<span class="Delimiter">);</span>  <span class="Comment">// which button, etc.</span>
+<span id="L492" class="LineNr">492 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>y<span class="Delimiter">);</span>  <span class="Comment">// row</span>
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>x<span class="Delimiter">);</span>  <span class="Comment">// column</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Delimiter">}</span>
 <span id="L497" class="LineNr">497 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_RESIZE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L498" class="LineNr">498 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">resize event</span><span class="Comment">*/</span><span class="Constant">3</span><span class="Delimiter">);</span>
-<span id="L499" class="LineNr">499 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>w<span class="Delimiter">);</span>  <span class="Comment">// width</span>
-<span id="L500" class="LineNr">500 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>h<span class="Delimiter">);</span>  <span class="Comment">// height</span>
-<span id="L501" class="LineNr">501 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L502" class="LineNr">502 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
-<span id="L503" class="LineNr">503 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">resize event</span><span class="Comment">*/</span><span class="Constant">3</span><span class="Delimiter">);</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>w<span class="Delimiter">);</span>  <span class="Comment">// width</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>event<span class="Delimiter">.</span>h<span class="Delimiter">);</span>  <span class="Comment">// height</span>
+<span id="L501" class="LineNr">501 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">true</span><span class="Delimiter">);</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L504" class="LineNr">504 </span>  <span class="Delimiter">}</span>
 <span id="L505" class="LineNr">505 </span>  assert<span class="Delimiter">(</span>event_type == <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L506" class="LineNr">506 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
@@ -607,9 +608,9 @@ if ('onhashchange' in window) {
 <span id="L547" class="LineNr">547 </span>  <span class="Normal">int</span> right = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L548" class="LineNr">548 </span>  <span class="Normal">int</span> height=tb_height<span class="Delimiter">();</span>
 <span id="L549" class="LineNr">549 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">nada</span><span class="Comment">*/</span><span class="Delimiter">;</span>  row &lt; height<span class="Delimiter">;</span>  ++row<span class="Delimiter">,</span> column=left<span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// start column from left in every inner loop except first</span>
-<span id="L550" class="LineNr">550 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">nada</span><span class="Comment">*/</span><span class="Delimiter">;</span>  column &lt;= right<span class="Delimiter">;</span>  ++column<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L551" class="LineNr">551 </span>      tb_change_cell<span class="Delimiter">(</span>column<span class="Delimiter">,</span> row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> TB_WHITE<span class="Delimiter">,</span> TB_BLACK<span class="Delimiter">);</span>
-<span id="L552" class="LineNr">552 </span>    <span class="Delimiter">}</span>
+<span id="L550" class="LineNr">550 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">nada</span><span class="Comment">*/</span><span class="Delimiter">;</span>  column &lt;= right<span class="Delimiter">;</span>  ++column<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L551" class="LineNr">551 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_change_cell<span class="Delimiter">(</span>column<span class="Delimiter">,</span> row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> TB_WHITE<span class="Delimiter">,</span> TB_BLACK<span class="Delimiter">);</span>
+<span id="L552" class="LineNr">552 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L553" class="LineNr">553 </span>  <span class="Delimiter">}</span>
 <span id="L554" class="LineNr">554 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Autodisplay<span class="Delimiter">)</span> tb_present<span class="Delimiter">();</span>
 <span id="L555" class="LineNr">555 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
diff --git a/html/081print.mu.html b/html/081print.mu.html
index 33ddf53a..6796ccbc 100644
--- a/html/081print.mu.html
+++ b/html/081print.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .CommentedCode { color: #6c6c6c; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -89,22 +90,22 @@ if ('onhashchange' in window) {
 <span id="L28" class="LineNr"> 28 </span>  <span class="Constant">local-scope</span>
 <span id="L29" class="LineNr"> 29 </span>  <span class="Constant">load-ingredients</span>
 <span id="L30" class="LineNr"> 30 </span>  <span class="Delimiter">{</span>
-<span id="L31" class="LineNr"> 31 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L32" class="LineNr"> 32 </span>    <span class="Comment"># real screen</span>
-<span id="L33" class="LineNr"> 33 </span>    clear-display
-<span id="L34" class="LineNr"> 34 </span>    <span class="muControl">return</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> clear-display
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Delimiter">}</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Comment"># fake screen</span>
 <span id="L37" class="LineNr"> 37 </span>  buf:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *screen, <span class="Constant">data:offset</span>
 <span id="L38" class="LineNr"> 38 </span>  max:num <span class="Special">&lt;-</span> length *buf
 <span id="L39" class="LineNr"> 39 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Delimiter">{</span>
-<span id="L41" class="LineNr"> 41 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, max
-<span id="L42" class="LineNr"> 42 </span>    <span class="muControl">break-if</span> done?
-<span id="L43" class="LineNr"> 43 </span>    curr:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> merge <span class="Constant">0/empty</span>, <span class="Constant">7/white</span>
-<span id="L44" class="LineNr"> 44 </span>    *buf <span class="Special">&lt;-</span> put-index *buf, i, curr
-<span id="L45" class="LineNr"> 45 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L46" class="LineNr"> 46 </span>    <span class="muControl">loop</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, max
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> curr:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> merge <span class="Constant">0/empty</span>, <span class="Constant">7/white</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> *buf <span class="Special">&lt;-</span> put-index *buf, i, curr
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Delimiter">}</span>
 <span id="L48" class="LineNr"> 48 </span>  <span class="Comment"># reset cursor</span>
 <span id="L49" class="LineNr"> 49 </span>  *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 0</span>
@@ -126,14 +127,14 @@ if ('onhashchange' in window) {
 <span id="L65" class="LineNr"> 65 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L66" class="LineNr"> 66 </span>  len:num <span class="Special">&lt;-</span> length *buf
 <span id="L67" class="LineNr"> 67 </span>  <span class="Delimiter">{</span>
-<span id="L68" class="LineNr"> 68 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L69" class="LineNr"> 69 </span>    <span class="muControl">break-if</span> done?
-<span id="L70" class="LineNr"> 70 </span>    curr:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> index *buf, i
-<span id="L71" class="LineNr"> 71 </span>    curr-contents:char <span class="Special">&lt;-</span> get curr, <span class="Constant">contents:offset</span>
-<span id="L72" class="LineNr"> 72 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="muControl">loop-unless</span> curr-contents
-<span id="L74" class="LineNr"> 74 </span>    <span class="Comment"># not 0</span>
-<span id="L75" class="LineNr"> 75 </span>    <span class="muControl">return</span> <span class="Constant">0/false</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> curr:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> index *buf, i
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> curr-contents:char <span class="Special">&lt;-</span> get curr, <span class="Constant">contents:offset</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> curr-contents
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Comment"># not 0</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/false</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Delimiter">}</span>
 <span id="L77" class="LineNr"> 77 </span>  <span class="muControl">return</span> <span class="Constant">1/true</span>
 <span id="L78" class="LineNr"> 78 </span>]
@@ -143,23 +144,23 @@ if ('onhashchange' in window) {
 <span id="L82" class="LineNr"> 82 </span>  <span class="Constant">load-ingredients</span>
 <span id="L83" class="LineNr"> 83 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Delimiter">{</span>
-<span id="L85" class="LineNr"> 85 </span>    <span class="Comment"># default color to white</span>
-<span id="L86" class="LineNr"> 86 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L87" class="LineNr"> 87 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
 <span id="L88" class="LineNr"> 88 </span>  <span class="Delimiter">}</span>
 <span id="L89" class="LineNr"> 89 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L90" class="LineNr"> 90 </span>  <span class="Delimiter">{</span>
-<span id="L91" class="LineNr"> 91 </span>    <span class="Comment"># default bg-color to black</span>
-<span id="L92" class="LineNr"> 92 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L93" class="LineNr"> 93 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Delimiter">}</span>
 <span id="L95" class="LineNr"> 95 </span>  c2:num <span class="Special">&lt;-</span> character-to-code c
 <span id="L96" class="LineNr"> 96 </span>  trace<span class="Constant"> 90</span>, <span class="Constant">[print-character]</span>, c2
 <span id="L97" class="LineNr"> 97 </span>  <span class="Delimiter">{</span>
-<span id="L98" class="LineNr"> 98 </span>    <span class="Comment"># real screen</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L100" class="LineNr">100 </span>    print-character-to-display c, color, bg-color
-<span id="L101" class="LineNr">101 </span>    <span class="muControl">return</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> print-character-to-display c, color, bg-color
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>  <span class="Comment"># fake screen</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Comment"># (handle special cases exactly like in the real screen)</span>
@@ -181,20 +182,20 @@ if ('onhashchange' in window) {
 <span id="L120" class="LineNr">120 </span><span class="CommentedCode">#?     $print [print-character (], row, [, ], column, [): ], c, 10/newline</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Comment"># special-case: newline</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Delimiter">{</span>
-<span id="L123" class="LineNr">123 </span>    newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L124" class="LineNr">124 </span>    <span class="muControl">break-unless</span> newline?
-<span id="L125" class="LineNr">125 </span>    <span class="Delimiter">{</span>
-<span id="L126" class="LineNr">126 </span>      <span class="Comment"># unless cursor is already at bottom</span>
-<span id="L127" class="LineNr">127 </span>      bottom:num <span class="Special">&lt;-</span> subtract height,<span class="Constant"> 1</span>
-<span id="L128" class="LineNr">128 </span>      at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, bottom
-<span id="L129" class="LineNr">129 </span>      <span class="muControl">break-if</span> at-bottom?
-<span id="L130" class="LineNr">130 </span>      <span class="Comment"># move it to the next row</span>
-<span id="L131" class="LineNr">131 </span>      column <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
-<span id="L132" class="LineNr">132 </span>      *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, column
-<span id="L133" class="LineNr">133 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L134" class="LineNr">134 </span>      *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-row:offset</span>, row
-<span id="L135" class="LineNr">135 </span>    <span class="Delimiter">}</span>
-<span id="L136" class="LineNr">136 </span>    <span class="muControl">return</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># unless cursor is already at bottom</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> bottom:num <span class="Special">&lt;-</span> subtract height,<span class="Constant"> 1</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, bottom
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-bottom?
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># move it to the next row</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, column
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-row:offset</span>, row
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Delimiter">}</span>
 <span id="L138" class="LineNr">138 </span>  <span class="Comment"># save character in fake screen</span>
 <span id="L139" class="LineNr">139 </span>  index:num <span class="Special">&lt;-</span> multiply row, width
@@ -203,30 +204,30 @@ if ('onhashchange' in window) {
 <span id="L142" class="LineNr">142 </span>  len:num <span class="Special">&lt;-</span> length *buf
 <span id="L143" class="LineNr">143 </span>  <span class="Comment"># special-case: backspace</span>
 <span id="L144" class="LineNr">144 </span>  <span class="Delimiter">{</span>
-<span id="L145" class="LineNr">145 </span>    backspace?:bool <span class="Special">&lt;-</span> equal c,<span class="Constant"> 8</span>
-<span id="L146" class="LineNr">146 </span>    <span class="muControl">break-unless</span> backspace?
-<span id="L147" class="LineNr">147 </span>    <span class="Delimiter">{</span>
-<span id="L148" class="LineNr">148 </span>      <span class="Comment"># unless cursor is already at left margin</span>
-<span id="L149" class="LineNr">149 </span>      at-left?:bool <span class="Special">&lt;-</span> lesser-or-equal column,<span class="Constant"> 0</span>
-<span id="L150" class="LineNr">150 </span>      <span class="muControl">break-if</span> at-left?
-<span id="L151" class="LineNr">151 </span>      <span class="Comment"># clear previous location</span>
-<span id="L152" class="LineNr">152 </span>      column <span class="Special">&lt;-</span> subtract column,<span class="Constant"> 1</span>
-<span id="L153" class="LineNr">153 </span>      *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, column
-<span id="L154" class="LineNr">154 </span>      index <span class="Special">&lt;-</span> subtract index,<span class="Constant"> 1</span>
-<span id="L155" class="LineNr">155 </span>      cursor:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> merge <span class="Constant">32/space</span>, <span class="Constant">7/white</span>
-<span id="L156" class="LineNr">156 </span>      *buf <span class="Special">&lt;-</span> put-index *buf, index, cursor
-<span id="L157" class="LineNr">157 </span>    <span class="Delimiter">}</span>
-<span id="L158" class="LineNr">158 </span>    <span class="muControl">return</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> backspace?:bool <span class="Special">&lt;-</span> equal c,<span class="Constant"> 8</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> backspace?
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># unless cursor is already at left margin</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-left?:bool <span class="Special">&lt;-</span> lesser-or-equal column,<span class="Constant"> 0</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-left?
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear previous location</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> subtract column,<span class="Constant"> 1</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, column
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> index <span class="Special">&lt;-</span> subtract index,<span class="Constant"> 1</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> merge <span class="Constant">32/space</span>, <span class="Constant">7/white</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *buf <span class="Special">&lt;-</span> put-index *buf, index, cursor
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Delimiter">}</span>
 <span id="L160" class="LineNr">160 </span>  cursor:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> merge c, color
 <span id="L161" class="LineNr">161 </span>  *buf <span class="Special">&lt;-</span> put-index *buf, index, cursor
 <span id="L162" class="LineNr">162 </span>  <span class="Comment"># increment column unless it's already all the way to the right</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>    right:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 1</span>
-<span id="L165" class="LineNr">165 </span>    at-right?:bool <span class="Special">&lt;-</span> greater-or-equal column, right
-<span id="L166" class="LineNr">166 </span>    <span class="muControl">break-if</span> at-right?
-<span id="L167" class="LineNr">167 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L168" class="LineNr">168 </span>    *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, column
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> right:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 1</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> greater-or-equal column, right
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-right?
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, column
 <span id="L169" class="LineNr">169 </span>  <span class="Delimiter">}</span>
 <span id="L170" class="LineNr">170 </span>]
 <span id="L171" class="LineNr">171 </span>
@@ -234,17 +235,17 @@ if ('onhashchange' in window) {
 <span id="L173" class="LineNr">173 </span>  <span class="Constant">local-scope</span>
 <span id="L174" class="LineNr">174 </span>  fake-screen:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L17'>new-fake-screen</a> <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
 <span id="L175" class="LineNr">175 </span>  run [
-<span id="L176" class="LineNr">176 </span>    a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
-<span id="L177" class="LineNr">177 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, a:char
-<span id="L178" class="LineNr">178 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L179" class="LineNr">179 </span>    1:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, a:char
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> 1:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L180" class="LineNr">180 </span>  ]
 <span id="L181" class="LineNr">181 </span>  memory-should-contain [
-<span id="L182" class="LineNr">182 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L183" class="LineNr">183 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L184" class="LineNr">184 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L185" class="LineNr">185 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L186" class="LineNr">186 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L187" class="LineNr">187 </span>  ]
 <span id="L188" class="LineNr">188 </span>]
 <span id="L189" class="LineNr">189 </span>
@@ -253,17 +254,17 @@ if ('onhashchange' in window) {
 <span id="L192" class="LineNr">192 </span>  fake-screen:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L17'>new-fake-screen</a> <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
 <span id="L193" class="LineNr">193 </span>  a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
 <span id="L194" class="LineNr">194 </span>  run [
-<span id="L195" class="LineNr">195 </span>    <a href='081print.mu.html#L442'>move-cursor</a> fake-screen, 0.5,<span class="Constant"> 0</span>
-<span id="L196" class="LineNr">196 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, a:char
-<span id="L197" class="LineNr">197 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L198" class="LineNr">198 </span>    1:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L442'>move-cursor</a> fake-screen, 0.5,<span class="Constant"> 0</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, a:char
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> 1:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L199" class="LineNr">199 </span>  ]
 <span id="L200" class="LineNr">200 </span>  memory-should-contain [
-<span id="L201" class="LineNr">201 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L202" class="LineNr">202 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L203" class="LineNr">203 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L204" class="LineNr">204 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L205" class="LineNr">205 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L206" class="LineNr">206 </span>  ]
 <span id="L207" class="LineNr">207 </span>]
 <span id="L208" class="LineNr">208 </span>
@@ -271,17 +272,17 @@ if ('onhashchange' in window) {
 <span id="L210" class="LineNr">210 </span>  <span class="Constant">local-scope</span>
 <span id="L211" class="LineNr">211 </span>  fake-screen:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L17'>new-fake-screen</a> <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
 <span id="L212" class="LineNr">212 </span>  run [
-<span id="L213" class="LineNr">213 </span>    a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
-<span id="L214" class="LineNr">214 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, a:char, <span class="Constant">1/red</span>
-<span id="L215" class="LineNr">215 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L216" class="LineNr">216 </span>    1:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, a:char, <span class="Constant">1/red</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> 1:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L217" class="LineNr">217 </span>  ]
 <span id="L218" class="LineNr">218 </span>  memory-should-contain [
-<span id="L219" class="LineNr">219 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L220" class="LineNr">220 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L221" class="LineNr">221 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># red</span>
-<span id="L222" class="LineNr">222 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L223" class="LineNr">223 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># red</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L224" class="LineNr">224 </span>  ]
 <span id="L225" class="LineNr">225 </span>]
 <span id="L226" class="LineNr">226 </span>
@@ -291,19 +292,19 @@ if ('onhashchange' in window) {
 <span id="L230" class="LineNr">230 </span>  a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
 <span id="L231" class="LineNr">231 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, a
 <span id="L232" class="LineNr">232 </span>  run [
-<span id="L233" class="LineNr">233 </span>    backspace:char <span class="Special">&lt;-</span> copy <span class="Constant">8/backspace</span>
-<span id="L234" class="LineNr">234 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, backspace
-<span id="L235" class="LineNr">235 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
-<span id="L236" class="LineNr">236 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L237" class="LineNr">237 </span>    11:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> backspace:char <span class="Special">&lt;-</span> copy <span class="Constant">8/backspace</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, backspace
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> 11:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L238" class="LineNr">238 </span>  ]
 <span id="L239" class="LineNr">239 </span>  memory-should-contain [
-<span id="L240" class="LineNr">240 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
-<span id="L241" class="LineNr">241 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L242" class="LineNr">242 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 32</span>  <span class="Comment"># space, not 'a'</span>
-<span id="L243" class="LineNr">243 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L244" class="LineNr">244 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L245" class="LineNr">245 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 32</span>  <span class="Comment"># space, not 'a'</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L246" class="LineNr">246 </span>  ]
 <span id="L247" class="LineNr">247 </span>]
 <span id="L248" class="LineNr">248 </span>
@@ -313,20 +314,20 @@ if ('onhashchange' in window) {
 <span id="L252" class="LineNr">252 </span>  a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
 <span id="L253" class="LineNr">253 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, a
 <span id="L254" class="LineNr">254 </span>  run [
-<span id="L255" class="LineNr">255 </span>    backspace:char <span class="Special">&lt;-</span> copy <span class="Constant">8/backspace</span>
-<span id="L256" class="LineNr">256 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, backspace
-<span id="L257" class="LineNr">257 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, backspace  <span class="Comment"># cursor already at left margin</span>
-<span id="L258" class="LineNr">258 </span>    1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
-<span id="L259" class="LineNr">259 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L260" class="LineNr">260 </span>    3:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> backspace:char <span class="Special">&lt;-</span> copy <span class="Constant">8/backspace</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, backspace
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, backspace  <span class="Comment"># cursor already at left margin</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> 1:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> 3:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L261" class="LineNr">261 </span>  ]
 <span id="L262" class="LineNr">262 </span>  memory-should-contain [
-<span id="L263" class="LineNr">263 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
-<span id="L264" class="LineNr">264 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L265" class="LineNr">265 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 32</span>  <span class="Comment"># space, not 'a'</span>
-<span id="L266" class="LineNr">266 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L267" class="LineNr">267 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L268" class="LineNr">268 </span>   <span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 32</span>  <span class="Comment"># space, not 'a'</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span><span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L269" class="LineNr">269 </span>  ]
 <span id="L270" class="LineNr">270 </span>]
 <span id="L271" class="LineNr">271 </span>
@@ -339,22 +340,22 @@ if ('onhashchange' in window) {
 <span id="L278" class="LineNr">278 </span>  b:char <span class="Special">&lt;-</span> copy <span class="Constant">98/b</span>
 <span id="L279" class="LineNr">279 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, b
 <span id="L280" class="LineNr">280 </span>  run [
-<span id="L281" class="LineNr">281 </span>    <span class="Comment"># cursor now at right margin</span>
-<span id="L282" class="LineNr">282 </span>    c:char <span class="Special">&lt;-</span> copy <span class="Constant">99/c</span>
-<span id="L283" class="LineNr">283 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, c
-<span id="L284" class="LineNr">284 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
-<span id="L285" class="LineNr">285 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L286" class="LineNr">286 </span>    11:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Comment"># cursor now at right margin</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> copy <span class="Constant">99/c</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, c
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> 11:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L287" class="LineNr">287 </span>  ]
 <span id="L288" class="LineNr">288 </span>  memory-should-contain [
-<span id="L289" class="LineNr">289 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor column</span>
-<span id="L290" class="LineNr">290 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># width*height</span>
-<span id="L291" class="LineNr">291 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L292" class="LineNr">292 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L293" class="LineNr">293 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>  <span class="Comment"># 'c' over 'b'</span>
-<span id="L294" class="LineNr">294 </span>   <span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L295" class="LineNr">295 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L296" class="LineNr">296 </span>   <span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor column</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># width*height</span>
+<span id="L291" class="LineNr">291 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>  <span class="Comment"># 'c' over 'b'</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span><span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span><span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L297" class="LineNr">297 </span>  ]
 <span id="L298" class="LineNr">298 </span>]
 <span id="L299" class="LineNr">299 </span>
@@ -364,21 +365,21 @@ if ('onhashchange' in window) {
 <span id="L303" class="LineNr">303 </span>  a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
 <span id="L304" class="LineNr">304 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, a
 <span id="L305" class="LineNr">305 </span>  run [
-<span id="L306" class="LineNr">306 </span>    newline:char <span class="Special">&lt;-</span> copy <span class="Constant">10/newline</span>
-<span id="L307" class="LineNr">307 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
-<span id="L308" class="LineNr">308 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-row:offset</span>
-<span id="L309" class="LineNr">309 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
-<span id="L310" class="LineNr">310 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L311" class="LineNr">311 </span>    12:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> newline:char <span class="Special">&lt;-</span> copy <span class="Constant">10/newline</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-row:offset</span>
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
+<span id="L310" class="LineNr">310 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> 12:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L312" class="LineNr">312 </span>  ]
 <span id="L313" class="LineNr">313 </span>  memory-should-contain [
-<span id="L314" class="LineNr">314 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L315" class="LineNr">315 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
-<span id="L316" class="LineNr">316 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L317" class="LineNr">317 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L318" class="LineNr">318 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L319" class="LineNr">319 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L320" class="LineNr">320 </span>   <span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span><span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L321" class="LineNr">321 </span>  ]
 <span id="L322" class="LineNr">322 </span>]
 <span id="L323" class="LineNr">323 </span>
@@ -389,15 +390,15 @@ if ('onhashchange' in window) {
 <span id="L328" class="LineNr">328 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
 <span id="L329" class="LineNr">329 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
 <span id="L330" class="LineNr">330 </span>  run [
-<span id="L331" class="LineNr">331 </span>    <span class="Comment"># cursor now at bottom of screen</span>
-<span id="L332" class="LineNr">332 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
-<span id="L333" class="LineNr">333 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-row:offset</span>
-<span id="L334" class="LineNr">334 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
+<span id="L331" class="LineNr">331 </span>  <span class="Conceal">¦</span> <span class="Comment"># cursor now at bottom of screen</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-row:offset</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
 <span id="L335" class="LineNr">335 </span>  ]
 <span id="L336" class="LineNr">336 </span>  <span class="Comment"># doesn't move further down</span>
 <span id="L337" class="LineNr">337 </span>  memory-should-contain [
-<span id="L338" class="LineNr">338 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L339" class="LineNr">339 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
 <span id="L340" class="LineNr">340 </span>  ]
 <span id="L341" class="LineNr">341 </span>]
 <span id="L342" class="LineNr">342 </span>
@@ -414,28 +415,28 @@ if ('onhashchange' in window) {
 <span id="L353" class="LineNr">353 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, c
 <span id="L354" class="LineNr">354 </span>  fake-screen <span class="Special">&lt;-</span> print fake-screen, newline
 <span id="L355" class="LineNr">355 </span>  run [
-<span id="L356" class="LineNr">356 </span>    <span class="Comment"># cursor now at bottom right</span>
-<span id="L357" class="LineNr">357 </span>    d:char <span class="Special">&lt;-</span> copy <span class="Constant">100/d</span>
-<span id="L358" class="LineNr">358 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, d
-<span id="L359" class="LineNr">359 </span>    10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-row:offset</span>
-<span id="L360" class="LineNr">360 </span>    11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
-<span id="L361" class="LineNr">361 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L362" class="LineNr">362 </span>    20:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L356" class="LineNr">356 </span>  <span class="Conceal">¦</span> <span class="Comment"># cursor now at bottom right</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> d:char <span class="Special">&lt;-</span> copy <span class="Constant">100/d</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, d
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> 10:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-row:offset</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> 11:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">cursor-column:offset</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> 20:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L363" class="LineNr">363 </span>  ]
 <span id="L364" class="LineNr">364 </span>  memory-should-contain [
-<span id="L365" class="LineNr">365 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L366" class="LineNr">366 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor column</span>
-<span id="L367" class="LineNr">367 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># width*height</span>
-<span id="L368" class="LineNr">368 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># unused</span>
-<span id="L369" class="LineNr">369 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L370" class="LineNr">370 </span>   <span class="Constant"> 23</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># unused</span>
-<span id="L371" class="LineNr">371 </span>   <span class="Constant"> 24</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L372" class="LineNr">372 </span>   <span class="Constant"> 25</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span> <span class="Comment"># 'a'</span>
-<span id="L373" class="LineNr">373 </span>   <span class="Constant"> 26</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L374" class="LineNr">374 </span>   <span class="Constant"> 27</span> <span class="Special">&lt;-</span><span class="Constant"> 100</span>  <span class="Comment"># 'd' over 'b' and 'c' and newline</span>
-<span id="L375" class="LineNr">375 </span>   <span class="Constant"> 28</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L376" class="LineNr">376 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L377" class="LineNr">377 </span>   <span class="Constant"> 29</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor column</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># width*height</span>
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># unused</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span><span class="Constant"> 23</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># unused</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span><span class="Constant"> 24</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span><span class="Constant"> 25</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span> <span class="Comment"># 'a'</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span><span class="Constant"> 26</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span><span class="Constant"> 27</span> <span class="Special">&lt;-</span><span class="Constant"> 100</span>  <span class="Comment"># 'd' over 'b' and 'c' and newline</span>
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span><span class="Constant"> 28</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span><span class="Constant"> 29</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L378" class="LineNr">378 </span>  ]
 <span id="L379" class="LineNr">379 </span>]
 <span id="L380" class="LineNr">380 </span>
@@ -444,10 +445,10 @@ if ('onhashchange' in window) {
 <span id="L383" class="LineNr">383 </span>  <span class="Constant">load-ingredients</span>
 <span id="L384" class="LineNr">384 </span>  space:char <span class="Special">&lt;-</span> copy <span class="Constant">0/nul</span>
 <span id="L385" class="LineNr">385 </span>  <span class="Delimiter">{</span>
-<span id="L386" class="LineNr">386 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L387" class="LineNr">387 </span>    <span class="Comment"># real screen</span>
-<span id="L388" class="LineNr">388 </span>    clear-line-on-display
-<span id="L389" class="LineNr">389 </span>    <span class="muControl">return</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span> clear-line-on-display
+<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L390" class="LineNr">390 </span>  <span class="Delimiter">}</span>
 <span id="L391" class="LineNr">391 </span>  <span class="Comment"># fake screen</span>
 <span id="L392" class="LineNr">392 </span>  width:num <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-columns:offset</span>
@@ -455,12 +456,12 @@ if ('onhashchange' in window) {
 <span id="L394" class="LineNr">394 </span>  original-column:num <span class="Special">&lt;-</span> copy column
 <span id="L395" class="LineNr">395 </span>  <span class="Comment"># space over the entire line</span>
 <span id="L396" class="LineNr">396 </span>  <span class="Delimiter">{</span>
-<span id="L397" class="LineNr">397 </span>    right:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 1</span>
-<span id="L398" class="LineNr">398 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal column, right
-<span id="L399" class="LineNr">399 </span>    <span class="muControl">break-if</span> done?
-<span id="L400" class="LineNr">400 </span>    print <a href='081print.mu.html#L4'>screen</a>, space
-<span id="L401" class="LineNr">401 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L402" class="LineNr">402 </span>    <span class="muControl">loop</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span> right:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 1</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal column, right
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, space
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L403" class="LineNr">403 </span>  <span class="Delimiter">}</span>
 <span id="L404" class="LineNr">404 </span>  <span class="Comment"># now back to where the cursor was</span>
 <span id="L405" class="LineNr">405 </span>  *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-column:offset</span>, original-column
@@ -473,16 +474,16 @@ if ('onhashchange' in window) {
 <span id="L412" class="LineNr">412 </span>  space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
 <span id="L413" class="LineNr">413 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L414" class="LineNr">414 </span>  <span class="Delimiter">{</span>
-<span id="L415" class="LineNr">415 </span>    <span class="Comment"># default bg-color to black</span>
-<span id="L416" class="LineNr">416 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L417" class="LineNr">417 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L418" class="LineNr">418 </span>  <span class="Delimiter">}</span>
 <span id="L419" class="LineNr">419 </span>  <span class="Delimiter">{</span>
-<span id="L420" class="LineNr">420 </span>    done?:bool <span class="Special">&lt;-</span> greater-than column, right
-<span id="L421" class="LineNr">421 </span>    <span class="muControl">break-if</span> done?
-<span id="L422" class="LineNr">422 </span>    <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, space, <span class="Constant">7/white</span>, bg-color  <span class="Comment"># foreground color is mostly unused except if the cursor shows up at this cell</span>
-<span id="L423" class="LineNr">423 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L424" class="LineNr">424 </span>    <span class="muControl">loop</span>
+<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-than column, right
+<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, space, <span class="Constant">7/white</span>, bg-color  <span class="Comment"># foreground color is mostly unused except if the cursor shows up at this cell</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L425" class="LineNr">425 </span>  <span class="Delimiter">}</span>
 <span id="L426" class="LineNr">426 </span>]
 <span id="L427" class="LineNr">427 </span>
@@ -490,10 +491,10 @@ if ('onhashchange' in window) {
 <span id="L429" class="LineNr">429 </span>  <span class="Constant">local-scope</span>
 <span id="L430" class="LineNr">430 </span>  <span class="Constant">load-ingredients</span>
 <span id="L431" class="LineNr">431 </span>  <span class="Delimiter">{</span>
-<span id="L432" class="LineNr">432 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L433" class="LineNr">433 </span>    <span class="Comment"># real screen</span>
-<span id="L434" class="LineNr">434 </span>    row, column <span class="Special">&lt;-</span> cursor-position-on-display
-<span id="L435" class="LineNr">435 </span>    <span class="muControl">return</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> row, column <span class="Special">&lt;-</span> cursor-position-on-display
+<span id="L435" class="LineNr">435 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L436" class="LineNr">436 </span>  <span class="Delimiter">}</span>
 <span id="L437" class="LineNr">437 </span>  <span class="Comment"># fake screen</span>
 <span id="L438" class="LineNr">438 </span>  row:num <span class="Special">&lt;-</span> get *screen, <span class="Constant">cursor-row:offset</span>
@@ -504,10 +505,10 @@ if ('onhashchange' in window) {
 <span id="L443" class="LineNr">443 </span>  <span class="Constant">local-scope</span>
 <span id="L444" class="LineNr">444 </span>  <span class="Constant">load-ingredients</span>
 <span id="L445" class="LineNr">445 </span>  <span class="Delimiter">{</span>
-<span id="L446" class="LineNr">446 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L447" class="LineNr">447 </span>    <span class="Comment"># real screen</span>
-<span id="L448" class="LineNr">448 </span>    move-cursor-on-display new-row, new-column
-<span id="L449" class="LineNr">449 </span>    <span class="muControl">return</span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> move-cursor-on-display new-row, new-column
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L450" class="LineNr">450 </span>  <span class="Delimiter">}</span>
 <span id="L451" class="LineNr">451 </span>  <span class="Comment"># fake screen</span>
 <span id="L452" class="LineNr">452 </span>  *screen <span class="Special">&lt;-</span> put *screen, <span class="Constant">cursor-row:offset</span>, new-row
@@ -523,25 +524,25 @@ if ('onhashchange' in window) {
 <span id="L462" class="LineNr">462 </span>  <span class="Comment"># move cursor to start of line</span>
 <span id="L463" class="LineNr">463 </span>  fake-screen <span class="Special">&lt;-</span> <a href='081print.mu.html#L442'>move-cursor</a> fake-screen, <span class="Constant">0/row</span>, <span class="Constant">0/column</span>
 <span id="L464" class="LineNr">464 </span>  run [
-<span id="L465" class="LineNr">465 </span>    fake-screen <span class="Special">&lt;-</span> <a href='081print.mu.html#L381'>clear-line</a> fake-screen
-<span id="L466" class="LineNr">466 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L467" class="LineNr">467 </span>    10:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> <a href='081print.mu.html#L381'>clear-line</a> fake-screen
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> 10:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L468" class="LineNr">468 </span>  ]
 <span id="L469" class="LineNr">469 </span>  <span class="Comment"># screen should be blank</span>
 <span id="L470" class="LineNr">470 </span>  memory-should-contain [
-<span id="L471" class="LineNr">471 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L472" class="LineNr">472 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L473" class="LineNr">473 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
-<span id="L474" class="LineNr">474 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L475" class="LineNr">475 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
-<span id="L476" class="LineNr">476 </span>   <span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L477" class="LineNr">477 </span>   <span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
-<span id="L478" class="LineNr">478 </span>   <span class="Constant"> 17</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L479" class="LineNr">479 </span>   <span class="Constant"> 18</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
-<span id="L480" class="LineNr">480 </span>   <span class="Constant"> 19</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L481" class="LineNr">481 </span>   <span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
-<span id="L482" class="LineNr">482 </span>   <span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L483" class="LineNr">483 </span>   <span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span><span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span><span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span><span class="Constant"> 17</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L479" class="LineNr">479 </span>  <span class="Conceal">¦</span><span class="Constant"> 18</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span><span class="Constant"> 19</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L481" class="LineNr">481 </span>  <span class="Conceal">¦</span><span class="Constant"> 20</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L482" class="LineNr">482 </span>  <span class="Conceal">¦</span><span class="Constant"> 21</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L483" class="LineNr">483 </span>  <span class="Conceal">¦</span><span class="Constant"> 22</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
 <span id="L484" class="LineNr">484 </span>  ]
 <span id="L485" class="LineNr">485 </span>]
 <span id="L486" class="LineNr">486 </span>
@@ -549,10 +550,10 @@ if ('onhashchange' in window) {
 <span id="L488" class="LineNr">488 </span>  <span class="Constant">local-scope</span>
 <span id="L489" class="LineNr">489 </span>  <span class="Constant">load-ingredients</span>
 <span id="L490" class="LineNr">490 </span>  <span class="Delimiter">{</span>
-<span id="L491" class="LineNr">491 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L492" class="LineNr">492 </span>    <span class="Comment"># real screen</span>
-<span id="L493" class="LineNr">493 </span>    move-cursor-down-on-display
-<span id="L494" class="LineNr">494 </span>    <span class="muControl">return</span>
+<span id="L491" class="LineNr">491 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L492" class="LineNr">492 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span> move-cursor-down-on-display
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L495" class="LineNr">495 </span>  <span class="Delimiter">}</span>
 <span id="L496" class="LineNr">496 </span>  <span class="Comment"># fake screen</span>
 <span id="L497" class="LineNr">497 </span>  height:num <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-rows:offset</span>
@@ -568,10 +569,10 @@ if ('onhashchange' in window) {
 <span id="L507" class="LineNr">507 </span>  <span class="Constant">local-scope</span>
 <span id="L508" class="LineNr">508 </span>  <span class="Constant">load-ingredients</span>
 <span id="L509" class="LineNr">509 </span>  <span class="Delimiter">{</span>
-<span id="L510" class="LineNr">510 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L511" class="LineNr">511 </span>    <span class="Comment"># real screen</span>
-<span id="L512" class="LineNr">512 </span>    move-cursor-up-on-display
-<span id="L513" class="LineNr">513 </span>    <span class="muControl">return</span>
+<span id="L510" class="LineNr">510 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L511" class="LineNr">511 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L512" class="LineNr">512 </span>  <span class="Conceal">¦</span> move-cursor-up-on-display
+<span id="L513" class="LineNr">513 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L514" class="LineNr">514 </span>  <span class="Delimiter">}</span>
 <span id="L515" class="LineNr">515 </span>  <span class="Comment"># fake screen</span>
 <span id="L516" class="LineNr">516 </span>  row:num <span class="Special">&lt;-</span> get *screen, <span class="Constant">cursor-row:offset</span>
@@ -585,10 +586,10 @@ if ('onhashchange' in window) {
 <span id="L524" class="LineNr">524 </span>  <span class="Constant">local-scope</span>
 <span id="L525" class="LineNr">525 </span>  <span class="Constant">load-ingredients</span>
 <span id="L526" class="LineNr">526 </span>  <span class="Delimiter">{</span>
-<span id="L527" class="LineNr">527 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L528" class="LineNr">528 </span>    <span class="Comment"># real screen</span>
-<span id="L529" class="LineNr">529 </span>    move-cursor-right-on-display
-<span id="L530" class="LineNr">530 </span>    <span class="muControl">return</span>
+<span id="L527" class="LineNr">527 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L528" class="LineNr">528 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L529" class="LineNr">529 </span>  <span class="Conceal">¦</span> move-cursor-right-on-display
+<span id="L530" class="LineNr">530 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L531" class="LineNr">531 </span>  <span class="Delimiter">}</span>
 <span id="L532" class="LineNr">532 </span>  <span class="Comment"># fake screen</span>
 <span id="L533" class="LineNr">533 </span>  width:num <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-columns:offset</span>
@@ -604,10 +605,10 @@ if ('onhashchange' in window) {
 <span id="L543" class="LineNr">543 </span>  <span class="Constant">local-scope</span>
 <span id="L544" class="LineNr">544 </span>  <span class="Constant">load-ingredients</span>
 <span id="L545" class="LineNr">545 </span>  <span class="Delimiter">{</span>
-<span id="L546" class="LineNr">546 </span>    <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L547" class="LineNr">547 </span>    <span class="Comment"># real screen</span>
-<span id="L548" class="LineNr">548 </span>    move-cursor-left-on-display
-<span id="L549" class="LineNr">549 </span>    <span class="muControl">return</span>
+<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> <span class="Comment"># real screen</span>
+<span id="L548" class="LineNr">548 </span>  <span class="Conceal">¦</span> move-cursor-left-on-display
+<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L550" class="LineNr">550 </span>  <span class="Delimiter">}</span>
 <span id="L551" class="LineNr">551 </span>  <span class="Comment"># fake screen</span>
 <span id="L552" class="LineNr">552 </span>  column:num <span class="Special">&lt;-</span> get *screen, <span class="Constant">cursor-column:offset</span>
@@ -643,10 +644,10 @@ if ('onhashchange' in window) {
 <span id="L582" class="LineNr">582 </span>  <span class="Constant">local-scope</span>
 <span id="L583" class="LineNr">583 </span>  <span class="Constant">load-ingredients</span>
 <span id="L584" class="LineNr">584 </span>  <span class="Delimiter">{</span>
-<span id="L585" class="LineNr">585 </span>    <span class="muControl">break-unless</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L586" class="LineNr">586 </span>    <span class="Comment"># fake screen</span>
-<span id="L587" class="LineNr">587 </span>    width <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-columns:offset</span>
-<span id="L588" class="LineNr">588 </span>    <span class="muControl">return</span>
+<span id="L585" class="LineNr">585 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L586" class="LineNr">586 </span>  <span class="Conceal">¦</span> <span class="Comment"># fake screen</span>
+<span id="L587" class="LineNr">587 </span>  <span class="Conceal">¦</span> width <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-columns:offset</span>
+<span id="L588" class="LineNr">588 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L589" class="LineNr">589 </span>  <span class="Delimiter">}</span>
 <span id="L590" class="LineNr">590 </span>  <span class="Comment"># real screen</span>
 <span id="L591" class="LineNr">591 </span>  width <span class="Special">&lt;-</span> display-width
@@ -656,10 +657,10 @@ if ('onhashchange' in window) {
 <span id="L595" class="LineNr">595 </span>  <span class="Constant">local-scope</span>
 <span id="L596" class="LineNr">596 </span>  <span class="Constant">load-ingredients</span>
 <span id="L597" class="LineNr">597 </span>  <span class="Delimiter">{</span>
-<span id="L598" class="LineNr">598 </span>    <span class="muControl">break-unless</span> <a href='081print.mu.html#L4'>screen</a>
-<span id="L599" class="LineNr">599 </span>    <span class="Comment"># fake screen</span>
-<span id="L600" class="LineNr">600 </span>    height <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-rows:offset</span>
-<span id="L601" class="LineNr">601 </span>    <span class="muControl">return</span>
+<span id="L598" class="LineNr">598 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='081print.mu.html#L4'>screen</a>
+<span id="L599" class="LineNr">599 </span>  <span class="Conceal">¦</span> <span class="Comment"># fake screen</span>
+<span id="L600" class="LineNr">600 </span>  <span class="Conceal">¦</span> height <span class="Special">&lt;-</span> get *screen, <span class="Constant">num-rows:offset</span>
+<span id="L601" class="LineNr">601 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L602" class="LineNr">602 </span>  <span class="Delimiter">}</span>
 <span id="L603" class="LineNr">603 </span>  <span class="Comment"># real screen</span>
 <span id="L604" class="LineNr">604 </span>  height <span class="Special">&lt;-</span> display-height
@@ -702,25 +703,25 @@ if ('onhashchange' in window) {
 <span id="L641" class="LineNr">641 </span>  <span class="Constant">load-ingredients</span>
 <span id="L642" class="LineNr">642 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L643" class="LineNr">643 </span>  <span class="Delimiter">{</span>
-<span id="L644" class="LineNr">644 </span>    <span class="Comment"># default color to white</span>
-<span id="L645" class="LineNr">645 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L646" class="LineNr">646 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L644" class="LineNr">644 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L645" class="LineNr">645 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L646" class="LineNr">646 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
 <span id="L647" class="LineNr">647 </span>  <span class="Delimiter">}</span>
 <span id="L648" class="LineNr">648 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L649" class="LineNr">649 </span>  <span class="Delimiter">{</span>
-<span id="L650" class="LineNr">650 </span>    <span class="Comment"># default bg-color to black</span>
-<span id="L651" class="LineNr">651 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L652" class="LineNr">652 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L650" class="LineNr">650 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L651" class="LineNr">651 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L652" class="LineNr">652 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L653" class="LineNr">653 </span>  <span class="Delimiter">}</span>
 <span id="L654" class="LineNr">654 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L655" class="LineNr">655 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L656" class="LineNr">656 </span>  <span class="Delimiter">{</span>
-<span id="L657" class="LineNr">657 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L658" class="LineNr">658 </span>    <span class="muControl">break-if</span> done?
-<span id="L659" class="LineNr">659 </span>    c:char <span class="Special">&lt;-</span> index *s, i
-<span id="L660" class="LineNr">660 </span>    print <a href='081print.mu.html#L4'>screen</a>, c, color, bg-color
-<span id="L661" class="LineNr">661 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L662" class="LineNr">662 </span>    <span class="muControl">loop</span>
+<span id="L657" class="LineNr">657 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L658" class="LineNr">658 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L659" class="LineNr">659 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *s, i
+<span id="L660" class="LineNr">660 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c, color, bg-color
+<span id="L661" class="LineNr">661 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L662" class="LineNr">662 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L663" class="LineNr">663 </span>  <span class="Delimiter">}</span>
 <span id="L664" class="LineNr">664 </span>]
 <span id="L665" class="LineNr">665 </span>
@@ -728,20 +729,20 @@ if ('onhashchange' in window) {
 <span id="L667" class="LineNr">667 </span>  <span class="Constant">local-scope</span>
 <span id="L668" class="LineNr">668 </span>  fake-screen:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L17'>new-fake-screen</a> <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
 <span id="L669" class="LineNr">669 </span>  run [
-<span id="L670" class="LineNr">670 </span>    fake-screen <span class="Special">&lt;-</span> print fake-screen, <span class="Constant">[abcd]</span>
-<span id="L671" class="LineNr">671 </span>    cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
-<span id="L672" class="LineNr">672 </span>    10:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
+<span id="L670" class="LineNr">670 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, <span class="Constant">[abcd]</span>
+<span id="L671" class="LineNr">671 </span>  <span class="Conceal">¦</span> cell:&amp;:@:<a href='081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> get *fake-screen, <span class="Constant">data:offset</span>
+<span id="L672" class="LineNr">672 </span>  <span class="Conceal">¦</span> 10:@:<a href='081print.mu.html#L12'>screen-cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *cell
 <span id="L673" class="LineNr">673 </span>  ]
 <span id="L674" class="LineNr">674 </span>  memory-should-contain [
-<span id="L675" class="LineNr">675 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
-<span id="L676" class="LineNr">676 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L677" class="LineNr">677 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L678" class="LineNr">678 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>  <span class="Comment"># 'b'</span>
-<span id="L679" class="LineNr">679 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L680" class="LineNr">680 </span>   <span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 100</span>  <span class="Comment"># 'd' overwrites 'c'</span>
-<span id="L681" class="LineNr">681 </span>   <span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
-<span id="L682" class="LineNr">682 </span>    <span class="Comment"># rest of screen is empty</span>
-<span id="L683" class="LineNr">683 </span>   <span class="Constant"> 17</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L675" class="LineNr">675 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 6</span>  <span class="Comment"># width*height</span>
+<span id="L676" class="LineNr">676 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L677" class="LineNr">677 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L678" class="LineNr">678 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>  <span class="Comment"># 'b'</span>
+<span id="L679" class="LineNr">679 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L680" class="LineNr">680 </span>  <span class="Conceal">¦</span><span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 100</span>  <span class="Comment"># 'd' overwrites 'c'</span>
+<span id="L681" class="LineNr">681 </span>  <span class="Conceal">¦</span><span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>  <span class="Comment"># white</span>
+<span id="L682" class="LineNr">682 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L683" class="LineNr">683 </span>  <span class="Conceal">¦</span><span class="Constant"> 17</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L684" class="LineNr">684 </span>  ]
 <span id="L685" class="LineNr">685 </span>]
 <span id="L686" class="LineNr">686 </span>
@@ -750,15 +751,15 @@ if ('onhashchange' in window) {
 <span id="L689" class="LineNr">689 </span>  <span class="Constant">load-ingredients</span>
 <span id="L690" class="LineNr">690 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L691" class="LineNr">691 </span>  <span class="Delimiter">{</span>
-<span id="L692" class="LineNr">692 </span>    <span class="Comment"># default color to white</span>
-<span id="L693" class="LineNr">693 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L694" class="LineNr">694 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L692" class="LineNr">692 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L693" class="LineNr">693 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L694" class="LineNr">694 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
 <span id="L695" class="LineNr">695 </span>  <span class="Delimiter">}</span>
 <span id="L696" class="LineNr">696 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L697" class="LineNr">697 </span>  <span class="Delimiter">{</span>
-<span id="L698" class="LineNr">698 </span>    <span class="Comment"># default bg-color to black</span>
-<span id="L699" class="LineNr">699 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L700" class="LineNr">700 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L698" class="LineNr">698 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L699" class="LineNr">699 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L700" class="LineNr">700 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L701" class="LineNr">701 </span>  <span class="Delimiter">}</span>
 <span id="L702" class="LineNr">702 </span>  <span class="Comment"># todo: other bases besides decimal</span>
 <span id="L703" class="LineNr">703 </span>  s:text <span class="Special">&lt;-</span> to-text n
@@ -770,15 +771,15 @@ if ('onhashchange' in window) {
 <span id="L709" class="LineNr">709 </span>  <span class="Constant">load-ingredients</span>
 <span id="L710" class="LineNr">710 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L711" class="LineNr">711 </span>  <span class="Delimiter">{</span>
-<span id="L712" class="LineNr">712 </span>    <span class="Comment"># default color to white</span>
-<span id="L713" class="LineNr">713 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L714" class="LineNr">714 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L712" class="LineNr">712 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L713" class="LineNr">713 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L714" class="LineNr">714 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
 <span id="L715" class="LineNr">715 </span>  <span class="Delimiter">}</span>
 <span id="L716" class="LineNr">716 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L717" class="LineNr">717 </span>  <span class="Delimiter">{</span>
-<span id="L718" class="LineNr">718 </span>    <span class="Comment"># default bg-color to black</span>
-<span id="L719" class="LineNr">719 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L720" class="LineNr">720 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L718" class="LineNr">718 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L719" class="LineNr">719 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L720" class="LineNr">720 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L721" class="LineNr">721 </span>  <span class="Delimiter">}</span>
 <span id="L722" class="LineNr">722 </span>  n2:num <span class="Special">&lt;-</span> copy n
 <span id="L723" class="LineNr">723 </span>  <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, n2, color, bg-color
@@ -789,15 +790,15 @@ if ('onhashchange' in window) {
 <span id="L728" class="LineNr">728 </span>  <span class="Constant">load-ingredients</span>
 <span id="L729" class="LineNr">729 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L730" class="LineNr">730 </span>  <span class="Delimiter">{</span>
-<span id="L731" class="LineNr">731 </span>    <span class="Comment"># default color to white</span>
-<span id="L732" class="LineNr">732 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L733" class="LineNr">733 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L731" class="LineNr">731 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L732" class="LineNr">732 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L733" class="LineNr">733 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
 <span id="L734" class="LineNr">734 </span>  <span class="Delimiter">}</span>
 <span id="L735" class="LineNr">735 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L736" class="LineNr">736 </span>  <span class="Delimiter">{</span>
-<span id="L737" class="LineNr">737 </span>    <span class="Comment"># default bg-color to black</span>
-<span id="L738" class="LineNr">738 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L739" class="LineNr">739 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L737" class="LineNr">737 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L738" class="LineNr">738 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L739" class="LineNr">739 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L740" class="LineNr">740 </span>  <span class="Delimiter">}</span>
 <span id="L741" class="LineNr">741 </span>  n2:num <span class="Special">&lt;-</span> copy n
 <span id="L742" class="LineNr">742 </span>  <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, n2, color, bg-color
diff --git a/html/082scenario_screen.cc.html b/html/082scenario_screen.cc.html
index 45f55deb..0a66066b 100644
--- a/html/082scenario_screen.cc.html
+++ b/html/082scenario_screen.cc.html
@@ -15,18 +15,19 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.traceAbsent { color: #c00000; }
-.Special { color: #c00000; }
-.traceContains { color: #008000; }
+.muRecipe { color: #ff8700; }
 .muScenario { color: #00af00; }
-.Comment { color: #9090ff; }
-.Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.Identifier { color: #c0a020; }
+.traceContains { color: #008000; }
+.traceAbsent { color: #c00000; }
+.Delimiter { color: #800080; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .cSpecial { color: #008000; }
-.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
+.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.Special { color: #c00000; }
+.Identifier { color: #c0a020; }
 -->
 </style>
 
@@ -78,14 +79,14 @@ if ('onhashchange' in window) {
 <span id="L15" class="LineNr"> 15 </span>  local-scope
 <span id="L16" class="LineNr"> 16 </span>  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
 <span id="L17" class="LineNr"> 17 </span>  run [
-<span id="L18" class="LineNr"> 18 </span>    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
-<span id="L19" class="LineNr"> 19 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
 <span id="L20" class="LineNr"> 20 </span>  ]
 <span id="L21" class="LineNr"> 21 </span>  screen-should-contain [
 <span id="L22" class="LineNr"> 22 </span>  <span class="Comment">#  01234</span>
-<span id="L23" class="LineNr"> 23 </span>    <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
-<span id="L24" class="LineNr"> 24 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L25" class="LineNr"> 25 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L26" class="LineNr"> 26 </span>  ]
 <span id="L27" class="LineNr"> 27 </span>]
 <span id="L28" class="LineNr"> 28 </span><span class="Comment"># checks are inside scenario</span>
@@ -96,16 +97,16 @@ if ('onhashchange' in window) {
 <span id="L33" class="LineNr"> 33 </span>  local-scope
 <span id="L34" class="LineNr"> 34 </span>  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
 <span id="L35" class="LineNr"> 35 </span>  run [
-<span id="L36" class="LineNr"> 36 </span>    <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
-<span id="L37" class="LineNr"> 37 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda
-<span id="L38" class="LineNr"> 38 </span>    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
-<span id="L39" class="LineNr"> 39 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
 <span id="L40" class="LineNr"> 40 </span>  ]
 <span id="L41" class="LineNr"> 41 </span>  screen-should-contain [
 <span id="L42" class="LineNr"> 42 </span>  <span class="Comment">#  01234</span>
-<span id="L43" class="LineNr"> 43 </span>    <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
-<span id="L44" class="LineNr"> 44 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L46" class="LineNr"> 46 </span>  ]
 <span id="L47" class="LineNr"> 47 </span>]
 <span id="L48" class="LineNr"> 48 </span><span class="Comment"># checks are inside scenario</span>
@@ -115,32 +116,32 @@ if ('onhashchange' in window) {
 <span id="L52" class="LineNr"> 52 </span>  local-scope
 <span id="L53" class="LineNr"> 53 </span>  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
 <span id="L54" class="LineNr"> 54 </span>  run [
-<span id="L55" class="LineNr"> 55 </span>    <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
-<span id="L56" class="LineNr"> 56 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda<span class="Delimiter">,</span> <span class="Constant">1</span>/red
-<span id="L57" class="LineNr"> 57 </span>    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
-<span id="L58" class="LineNr"> 58 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">7</span>/white
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Normal">lambda</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">955</span>/greek-small-lambda
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> lambda<span class="Delimiter">,</span> <span class="Constant">1</span>/red
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">7</span>/white
 <span id="L59" class="LineNr"> 59 </span>  ]
 <span id="L60" class="LineNr"> 60 </span>  <span class="Comment"># screen-should-contain shows everything</span>
 <span id="L61" class="LineNr"> 61 </span>  screen-should-contain [
 <span id="L62" class="LineNr"> 62 </span>  <span class="Comment">#  01234</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
-<span id="L64" class="LineNr"> 64 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L65" class="LineNr"> 65 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>λa   <span class="Delimiter">.</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L66" class="LineNr"> 66 </span>  ]
 <span id="L67" class="LineNr"> 67 </span>  <span class="Comment"># screen-should-contain-in-color filters out everything except the given</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Comment"># color, all you see is the 'a' in white.</span>
 <span id="L69" class="LineNr"> 69 </span>  screen-should-contain-in-color <span class="Constant">7</span>/white<span class="Delimiter">,</span> [
 <span id="L70" class="LineNr"> 70 </span>  <span class="Comment">#  01234</span>
-<span id="L71" class="LineNr"> 71 </span>    <span class="Delimiter">.</span> a   <span class="Delimiter">.</span>
-<span id="L72" class="LineNr"> 72 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L73" class="LineNr"> 73 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span> a   <span class="Delimiter">.</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L74" class="LineNr"> 74 </span>  ]
 <span id="L75" class="LineNr"> 75 </span>  <span class="Comment"># ..and the λ in red.</span>
 <span id="L76" class="LineNr"> 76 </span>  screen-should-contain-in-color <span class="Constant">1</span>/red<span class="Delimiter">,</span> [
 <span id="L77" class="LineNr"> 77 </span>  <span class="Comment">#  01234</span>
-<span id="L78" class="LineNr"> 78 </span>    <span class="Delimiter">.</span>λ    <span class="Delimiter">.</span>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L80" class="LineNr"> 80 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>λ    <span class="Delimiter">.</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L81" class="LineNr"> 81 </span>  ]
 <span id="L82" class="LineNr"> 82 </span>]
 <span id="L83" class="LineNr"> 83 </span><span class="Comment"># checks are inside scenario</span>
@@ -152,14 +153,14 @@ if ('onhashchange' in window) {
 <span id="L89" class="LineNr"> 89 </span>  local-scope
 <span id="L90" class="LineNr"> 90 </span>  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
 <span id="L91" class="LineNr"> 91 </span>  run [
-<span id="L92" class="LineNr"> 92 </span>    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
-<span id="L93" class="LineNr"> 93 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a
 <span id="L94" class="LineNr"> 94 </span>  ]
 <span id="L95" class="LineNr"> 95 </span>  screen-should-contain [
 <span id="L96" class="LineNr"> 96 </span>  <span class="Comment">#  01234</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="Delimiter">.</span>b    <span class="Delimiter">.</span>
-<span id="L98" class="LineNr"> 98 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L99" class="LineNr"> 99 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>b    <span class="Delimiter">.</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L100" class="LineNr">100 </span>  ]
 <span id="L101" class="LineNr">101 </span>]
 <span id="L102" class="LineNr">102 </span><span class="traceContains">+error: expected screen location (0, 0) to contain 98 ('b') instead of 97 ('a')</span>
@@ -172,14 +173,14 @@ if ('onhashchange' in window) {
 <span id="L109" class="LineNr">109 </span>  local-scope
 <span id="L110" class="LineNr">110 </span>  assume-screen <span class="Constant">5</span>/width<span class="Delimiter">,</span> <span class="Constant">3</span>/height
 <span id="L111" class="LineNr">111 </span>  run [
-<span id="L112" class="LineNr">112 </span>    <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
-<span id="L113" class="LineNr">113 </span>    <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">1</span>/red
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Normal">a</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">97</span>/a
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Normal">screen</span>:&amp;:screen<span class="Special"> &lt;- </span>print screen:&amp;:screen<span class="Delimiter">,</span> a<span class="Delimiter">,</span> <span class="Constant">1</span>/red
 <span id="L114" class="LineNr">114 </span>  ]
 <span id="L115" class="LineNr">115 </span>  screen-should-contain-in-color <span class="Constant">2</span>/green<span class="Delimiter">,</span> [
 <span id="L116" class="LineNr">116 </span>  <span class="Comment">#  01234</span>
-<span id="L117" class="LineNr">117 </span>    <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
-<span id="L118" class="LineNr">118 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
-<span id="L119" class="LineNr">119 </span>    <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>a    <span class="Delimiter">.</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Delimiter">.</span>     <span class="Delimiter">.</span>
 <span id="L120" class="LineNr">120 </span>  ]
 <span id="L121" class="LineNr">121 </span>]
 <span id="L122" class="LineNr">122 </span><span class="traceContains">+error: expected screen location (0, 0) to be in color 2 instead of 1</span>
@@ -224,15 +225,15 @@ if ('onhashchange' in window) {
 <span id="L161" class="LineNr">161 </span><span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;assume-screen&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L162" class="LineNr">162 </span>  curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;new-fake-screen&quot;</span><span class="Delimiter">;</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' has no products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' has no products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Delimiter">}</span>
 <span id="L166" class="LineNr">166 </span>  <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!starts_with<span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;scenario_&quot;</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L167" class="LineNr">167 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' can't be called here, only in scenarios</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;: 'assume-screen' can't be called here, only in scenarios</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Delimiter">}</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>    assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
-<span id="L171" class="LineNr">171 </span>    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;screen:&amp;:screen/raw&quot;</span><span class="Delimiter">));</span>
-<span id="L172" class="LineNr">172 </span>    curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>SCREEN<span class="Delimiter">);</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>reagent<span class="Delimiter">(</span><span class="Constant">&quot;screen:&amp;:screen/raw&quot;</span><span class="Delimiter">));</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> curr<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span><a href='010vm.cc.html#L65'>set_value</a><span class="Delimiter">(</span>SCREEN<span class="Delimiter">);</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Delimiter">}</span>
 <span id="L174" class="LineNr">174 </span><span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span>
@@ -251,12 +252,12 @@ if ('onhashchange' in window) {
 <span id="L188" class="LineNr">188 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L189" class="LineNr">189 </span><span class="Normal">case</span> SCREEN_SHOULD_CONTAIN: <span class="Delimiter">{</span>
 <span id="L190" class="LineNr">190 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L191" class="LineNr">191 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L192" class="LineNr">192 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Delimiter">}</span>
 <span id="L194" class="LineNr">194 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L195" class="LineNr">195 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L196" class="LineNr">196 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L197" class="LineNr">197 </span>  <span class="Delimiter">}</span>
 <span id="L198" class="LineNr">198 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L199" class="LineNr">199 </span><span class="Delimiter">}</span>
@@ -275,16 +276,16 @@ if ('onhashchange' in window) {
 <span id="L212" class="LineNr">212 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L213" class="LineNr">213 </span><span class="Normal">case</span> SCREEN_SHOULD_CONTAIN_IN_COLOR: <span class="Delimiter">{</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L215" class="LineNr">215 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain-in-color' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'screen-should-contain-in-color' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Delimiter">}</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L219" class="LineNr">219 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain-in-color' should be a number (color code), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L220" class="LineNr">220 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'screen-should-contain-in-color' should be a number (color code), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Delimiter">}</span>
 <span id="L222" class="LineNr">222 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L223" class="LineNr">223 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'screen-should-contain-in-color' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L224" class="LineNr">224 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'screen-should-contain-in-color' should be a literal string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L225" class="LineNr">225 </span>  <span class="Delimiter">}</span>
 <span id="L226" class="LineNr">226 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L227" class="LineNr">227 </span><span class="Delimiter">}</span>
@@ -326,74 +327,74 @@ if ('onhashchange' in window) {
 <span id="L263" class="LineNr">263 </span>  <span class="Comment">// todo: too-long expected_contents should fail</span>
 <span id="L264" class="LineNr">264 </span>  <span class="Normal">int</span> addr = screen_data_start+<span class="Comment">/*</span><span class="Comment">skip length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L265" class="LineNr">265 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> row = <span class="Constant">0</span><span class="Delimiter">;</span>  row &lt; screen_height<span class="Delimiter">;</span>  ++row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L266" class="LineNr">266 </span>    cursor<span class="Delimiter">.</span><a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">();</span>
-<span id="L267" class="LineNr">267 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L268" class="LineNr">268 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L269" class="LineNr">269 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: each row of the expected screen should start with a '.'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L270" class="LineNr">270 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L271" class="LineNr">271 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L272" class="LineNr">272 </span>    <span class="Delimiter">}</span>
-<span id="L273" class="LineNr">273 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> column = <span class="Constant">0</span><span class="Delimiter">;</span>  column &lt; screen_width<span class="Delimiter">;</span>  ++column<span class="Delimiter">,</span> addr+= <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L274" class="LineNr">274 </span>      <span class="Normal">const</span> <span class="Normal">int</span> cell_color_offset = <span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L275" class="LineNr">275 </span>      <span class="Normal">uint32_t</span> curr = cursor<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
-<span id="L276" class="LineNr">276 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == <span class="Constant">0</span> &amp;&amp; isspace<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L277" class="LineNr">277 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>curr == <span class="Constant">' '</span> &amp;&amp; color != -<span class="Constant">1</span> &amp;&amp; color != <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L278" class="LineNr">278 </span>        <span class="Comment">// filter out other colors</span>
-<span id="L279" class="LineNr">279 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L280" class="LineNr">280 </span>      <span class="Delimiter">}</span>
-<span id="L281" class="LineNr">281 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> != <span class="Constant">0</span> &amp;&amp; <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L282" class="LineNr">282 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>color == -<span class="Constant">1</span> || color == <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L283" class="LineNr">283 </span>        <span class="Comment">// contents match but color is off</span>
-<span id="L284" class="LineNr">284 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L285" class="LineNr">285 </span>          <span class="Comment">// genuine test in a .mu file</span>
-<span id="L286" class="LineNr">286 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;, <a href='043space.cc.html#L76'>address</a> &quot;</span> &lt;&lt; addr &lt;&lt; <span class="Constant">&quot;, value &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L287" class="LineNr">287 </span>          dump_screen<span class="Delimiter">();</span>
-<span id="L288" class="LineNr">288 </span>        <span class="Delimiter">}</span>
-<span id="L289" class="LineNr">289 </span>        <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L290" class="LineNr">290 </span>          <span class="Comment">// just testing check_screen</span>
-<span id="L291" class="LineNr">291 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L292" class="LineNr">292 </span>        <span class="Delimiter">}</span>
-<span id="L293" class="LineNr">293 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L294" class="LineNr">294 </span>        <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L295" class="LineNr">295 </span>      <span class="Delimiter">}</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> cursor<span class="Delimiter">.</span><a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">();</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: each row of the expected screen should start with a '.'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> column = <span class="Constant">0</span><span class="Delimiter">;</span>  column &lt; screen_width<span class="Delimiter">;</span>  ++column<span class="Delimiter">,</span> addr+= <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> <span class="Normal">int</span> cell_color_offset = <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L275" class="LineNr">275 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">uint32_t</span> curr = cursor<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == <span class="Constant">0</span> &amp;&amp; isspace<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr == <span class="Constant">' '</span> &amp;&amp; color != -<span class="Constant">1</span> &amp;&amp; color != <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// filter out other colors</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> != <span class="Constant">0</span> &amp;&amp; <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> == curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>color == -<span class="Constant">1</span> || color == <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// contents match but color is off</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// genuine test in a .mu file</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;, <a href='043space.cc.html#L76'>address</a> &quot;</span> &lt;&lt; addr &lt;&lt; <span class="Constant">&quot;, value &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> dump_screen<span class="Delimiter">();</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// just testing check_screen</span>
+<span id="L291" class="LineNr">291 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to be in color &quot;</span> &lt;&lt; color &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr+cell_color_offset<span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L296" class="LineNr">296 </span>
-<span id="L297" class="LineNr">297 </span>      <span class="Comment">// really a mismatch</span>
-<span id="L298" class="LineNr">298 </span>      <span class="Comment">// can't print multi-byte unicode characters in errors just yet. not very useful for debugging anyway.</span>
-<span id="L299" class="LineNr">299 </span>      <span class="Normal">char</span> expected_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
-<span id="L300" class="LineNr">300 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>curr &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L301" class="LineNr">301 </span>        <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
-<span id="L302" class="LineNr">302 </span>        expected_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span>curr<span class="Delimiter">),</span> expected_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
-<span id="L303" class="LineNr">303 </span>      <span class="Delimiter">}</span>
-<span id="L304" class="LineNr">304 </span>      <span class="Normal">char</span> actual_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
-<span id="L305" class="LineNr">305 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L306" class="LineNr">306 </span>        <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
-<span id="L307" class="LineNr">307 </span>        actual_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)),</span> actual_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
-<span id="L308" class="LineNr">308 </span>      <span class="Delimiter">}</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// really a mismatch</span>
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// can't print multi-byte unicode characters in errors just yet. not very useful for debugging anyway.</span>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">char</span> expected_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span>curr<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> expected_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span>curr<span class="Delimiter">),</span> expected_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> expected_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">char</span> actual_pretty[<span class="Constant">10</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)</span> &lt; <span class="Constant">256</span> &amp;&amp; !iscntrl<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// &quot; ('&lt;curr&gt;')&quot;</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> actual_pretty[<span class="Constant">0</span>] = <span class="Constant">' '</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">1</span>] = <span class="Constant">'('</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">2</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">3</span>] = <span class="Normal">static_cast</span>&lt;<span class="Normal">unsigned</span> <span class="Normal">char</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">)),</span> actual_pretty[<span class="Constant">4</span>] = <span class="cSpecial">'\''</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">5</span>] = <span class="Constant">')'</span><span class="Delimiter">,</span> actual_pretty[<span class="Constant">6</span>] = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L309" class="LineNr">309 </span>
-<span id="L310" class="LineNr">310 </span>      ostringstream color_phrase<span class="Delimiter">;</span>
-<span id="L311" class="LineNr">311 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>color != -<span class="Constant">1</span><span class="Delimiter">)</span> color_phrase &lt;&lt; <span class="Constant">&quot; in color &quot;</span> &lt;&lt; color<span class="Delimiter">;</span>
-<span id="L312" class="LineNr">312 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L313" class="LineNr">313 </span>        <span class="Comment">// genuine test in a .mu file</span>
-<span id="L314" class="LineNr">314 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L315" class="LineNr">315 </span>        dump_screen<span class="Delimiter">();</span>
-<span id="L316" class="LineNr">316 </span>      <span class="Delimiter">}</span>
-<span id="L317" class="LineNr">317 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L318" class="LineNr">318 </span>        <span class="Comment">// just testing check_screen</span>
-<span id="L319" class="LineNr">319 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L320" class="LineNr">320 </span>      <span class="Delimiter">}</span>
-<span id="L321" class="LineNr">321 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L322" class="LineNr">322 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L323" class="LineNr">323 </span>    <span class="Delimiter">}</span>
-<span id="L324" class="LineNr">324 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L325" class="LineNr">325 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: row &quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot; of the expected screen is too long</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L326" class="LineNr">326 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L327" class="LineNr">327 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L328" class="LineNr">328 </span>    <span class="Delimiter">}</span>
+<span id="L310" class="LineNr">310 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ostringstream color_phrase<span class="Delimiter">;</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>color != -<span class="Constant">1</span><span class="Delimiter">)</span> color_phrase &lt;&lt; <span class="Constant">&quot; in color &quot;</span> &lt;&lt; color<span class="Delimiter">;</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_scenario &amp;&amp; !Scenario_testing_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// genuine test in a .mu file</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">F - &quot;</span> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> dump_screen<span class="Delimiter">();</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// just testing check_screen</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;expected screen location (&quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot;, &quot;</span> &lt;&lt; column &lt;&lt; <span class="Constant">&quot;) to contain &quot;</span> &lt;&lt; curr &lt;&lt; expected_pretty &lt;&lt; color_phrase<span class="Delimiter">.</span>str<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot; instead of &quot;</span> &lt;&lt; no_scientific<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> addr<span class="Delimiter">))</span> &lt;&lt; actual_pretty &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>cursor<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'.'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: row &quot;</span> &lt;&lt; row &lt;&lt; <span class="Constant">&quot; of the expected screen is too long</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L326" class="LineNr">326 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!Scenario_testing_scenario<span class="Delimiter">)</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L329" class="LineNr">329 </span>  <span class="Delimiter">}</span>
 <span id="L330" class="LineNr">330 </span>  cursor<span class="Delimiter">.</span><a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">();</span>
 <span id="L331" class="LineNr">331 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!cursor<span class="Delimiter">.</span>at_end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L332" class="LineNr">332 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen has too many rows</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L333" class="LineNr">333 </span>    Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; Current_scenario<span class="Delimiter">-&gt;</span>name &lt;&lt; <span class="Constant">&quot;: expected screen has too many rows</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> Passed = <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L334" class="LineNr">334 </span>  <span class="Delimiter">}</span>
 <span id="L335" class="LineNr">335 </span><span class="Delimiter">}</span>
 <span id="L336" class="LineNr">336 </span>
@@ -402,8 +403,8 @@ if ('onhashchange' in window) {
 <span id="L339" class="LineNr">339 </span><span class="Normal">bool</span> raw_string_stream::at_end<span class="Delimiter">()</span> <span class="Normal">const</span> <span class="Delimiter">{</span>
 <span id="L340" class="LineNr">340 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>index &gt;= max<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L341" class="LineNr">341 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>tb_utf8_char_length<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &gt; max-index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L342" class="LineNr">342 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unicode string seems corrupted at index &quot;</span>&lt;&lt; index &lt;&lt; <span class="Constant">&quot; character &quot;</span> &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L343" class="LineNr">343 </span>    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;unicode string seems corrupted at index &quot;</span>&lt;&lt; index &lt;&lt; <span class="Constant">&quot; character &quot;</span> &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">int</span>&gt;<span class="Delimiter">(</span>buf[index]<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L344" class="LineNr">344 </span>  <span class="Delimiter">}</span>
 <span id="L345" class="LineNr">345 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L346" class="LineNr">346 </span><span class="Delimiter">}</span>
@@ -427,13 +428,13 @@ if ('onhashchange' in window) {
 <span id="L364" class="LineNr">364 </span>
 <span id="L365" class="LineNr">365 </span><span class="Normal">void</span> raw_string_stream::<a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L366" class="LineNr">366 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span>!at_end<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L367" class="LineNr">367 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>peek<span class="Delimiter">()))</span> get<span class="Delimiter">();</span>
-<span id="L368" class="LineNr">368 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L369" class="LineNr">369 </span>      <span class="Comment">// skip comment</span>
-<span id="L370" class="LineNr">370 </span>      get<span class="Delimiter">();</span>
-<span id="L371" class="LineNr">371 </span>      <span class="Normal">while</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> get<span class="Delimiter">();</span>  <span class="Comment">// implicitly also handles CRLF</span>
-<span id="L372" class="LineNr">372 </span>    <span class="Delimiter">}</span>
-<span id="L373" class="LineNr">373 </span>    <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>peek<span class="Delimiter">()))</span> get<span class="Delimiter">();</span>
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// skip comment</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> get<span class="Delimiter">();</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> get<span class="Delimiter">();</span>  <span class="Comment">// implicitly also handles CRLF</span>
+<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L374" class="LineNr">374 </span>  <span class="Delimiter">}</span>
 <span id="L375" class="LineNr">375 </span><span class="Delimiter">}</span>
 <span id="L376" class="LineNr">376 </span>
@@ -465,15 +466,15 @@ if ('onhashchange' in window) {
 <span id="L402" class="LineNr">402 </span>  assert<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> screen_data_start<span class="Delimiter">)</span> == screen_width*screen_height<span class="Delimiter">);</span>
 <span id="L403" class="LineNr">403 </span>  <span class="Normal">int</span> curr = screen_data_start+<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// skip length</span>
 <span id="L404" class="LineNr">404 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> row = <span class="Constant">0</span><span class="Delimiter">;</span>  row &lt; screen_height<span class="Delimiter">;</span>  ++row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L405" class="LineNr">405 </span>    cerr &lt;&lt; <span class="Constant">'.'</span><span class="Delimiter">;</span>
-<span id="L406" class="LineNr">406 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> col = <span class="Constant">0</span><span class="Delimiter">;</span>  col &lt; screen_width<span class="Delimiter">;</span>  ++col<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L407" class="LineNr">407 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">))</span>
-<span id="L408" class="LineNr">408 </span>        cerr &lt;&lt; to_unicode<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)));</span>
-<span id="L409" class="LineNr">409 </span>      <span class="Normal">else</span>
-<span id="L410" class="LineNr">410 </span>        cerr &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L411" class="LineNr">411 </span>      curr += <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>
-<span id="L412" class="LineNr">412 </span>    <span class="Delimiter">}</span>
-<span id="L413" class="LineNr">413 </span>    cerr &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
+<span id="L405" class="LineNr">405 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">'.'</span><span class="Delimiter">;</span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> col = <span class="Constant">0</span><span class="Delimiter">;</span>  col &lt; screen_width<span class="Delimiter">;</span>  ++col<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">))</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; to_unicode<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">uint32_t</span>&gt;<span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)));</span>
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr += <span class="Comment">/*</span><span class="Comment">size of screen-cell</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L414" class="LineNr">414 </span>  <span class="Delimiter">}</span>
 <span id="L415" class="LineNr">415 </span><span class="Delimiter">}</span>
 </pre>
diff --git a/html/083scenario_screen_test.mu.html b/html/083scenario_screen_test.mu.html
index 7b2bb361..917110d4 100644
--- a/html/083scenario_screen_test.mu.html
+++ b/html/083scenario_screen_test.mu.html
@@ -15,11 +15,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muScenario { color: #00af00; }
 -->
 </style>
 
@@ -60,12 +61,12 @@ if ('onhashchange' in window) {
 <span id="L4" class="LineNr"> 4 </span>  <span class="Constant">local-scope</span>
 <span id="L5" class="LineNr"> 5 </span>  assume-screen <span class="Constant">3/width</span>, <span class="Constant">2/height</span>
 <span id="L6" class="LineNr"> 6 </span>  run [
-<span id="L7" class="LineNr"> 7 </span>    a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
-<span id="L8" class="LineNr"> 8 </span>    <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, a
+<span id="L7" class="LineNr"> 7 </span>  <span class="Conceal">¦</span> a:char <span class="Special">&lt;-</span> copy <span class="Constant">97/a</span>
+<span id="L8" class="LineNr"> 8 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, a
 <span id="L9" class="LineNr"> 9 </span>  ]
 <span id="L10" class="LineNr">10 </span>  screen-should-contain [
-<span id="L11" class="LineNr">11 </span>   <span class="Constant"> .a  .</span>
-<span id="L12" class="LineNr">12 </span>   <span class="Constant"> .   .</span>
+<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span><span class="Constant"> .a  .</span>
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span><span class="Constant"> .   .</span>
 <span id="L13" class="LineNr">13 </span>  ]
 <span id="L14" class="LineNr">14 </span>]
 <span id="L15" class="LineNr">15 </span>
@@ -78,12 +79,12 @@ if ('onhashchange' in window) {
 <span id="L22" class="LineNr">22 </span>  <span class="Comment"># move cursor to start of line</span>
 <span id="L23" class="LineNr">23 </span>  <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L442'>move-cursor</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, <span class="Constant">0/row</span>, <span class="Constant">0/column</span>
 <span id="L24" class="LineNr">24 </span>  run [
-<span id="L25" class="LineNr">25 </span>    <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L381'>clear-line</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
+<span id="L25" class="LineNr">25 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L381'>clear-line</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
 <span id="L26" class="LineNr">26 </span>  ]
 <span id="L27" class="LineNr">27 </span>  screen-should-contain [
-<span id="L28" class="LineNr">28 </span>   <span class="Constant"> .     .</span>
-<span id="L29" class="LineNr">29 </span>   <span class="Constant"> .     .</span>
-<span id="L30" class="LineNr">30 </span>   <span class="Constant"> .     .</span>
+<span id="L28" class="LineNr">28 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L29" class="LineNr">29 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L30" class="LineNr">30 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L31" class="LineNr">31 </span>  ]
 <span id="L32" class="LineNr">32 </span>]
 </pre>
diff --git a/html/084console.mu.html b/html/084console.mu.html
index 1c344032..de92f8f6 100644
--- a/html/084console.mu.html
+++ b/html/084console.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -95,20 +96,20 @@ if ('onhashchange' in window) {
 <span id="L36" class="LineNr"> 36 </span>  <span class="Constant">local-scope</span>
 <span id="L37" class="LineNr"> 37 </span>  <span class="Constant">load-ingredients</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Delimiter">{</span>
-<span id="L39" class="LineNr"> 39 </span>    <span class="muControl">break-unless</span> <a href='084console.mu.html#L23'>console</a>
-<span id="L40" class="LineNr"> 40 </span>    current-event-index:num <span class="Special">&lt;-</span> get *console, <span class="Constant">current-event-index:offset</span>
-<span id="L41" class="LineNr"> 41 </span>    buf:&amp;:@:<a href='084console.mu.html#L4'>event</a> <span class="Special">&lt;-</span> get *console, <span class="Constant">events:offset</span>
-<span id="L42" class="LineNr"> 42 </span>    <span class="Delimiter">{</span>
-<span id="L43" class="LineNr"> 43 </span>      max:num <span class="Special">&lt;-</span> length *buf
-<span id="L44" class="LineNr"> 44 </span>      done?:bool <span class="Special">&lt;-</span> greater-or-equal current-event-index, max
-<span id="L45" class="LineNr"> 45 </span>      <span class="muControl">break-unless</span> done?
-<span id="L46" class="LineNr"> 46 </span>      dummy:&amp;:<a href='084console.mu.html#L4'>event</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='084console.mu.html#L4'>event</a>:type</span>
-<span id="L47" class="LineNr"> 47 </span>      <span class="muControl">return</span> *dummy, <span class="Constant">1/found</span>, <span class="Constant">1/quit</span>
-<span id="L48" class="LineNr"> 48 </span>    <span class="Delimiter">}</span>
-<span id="L49" class="LineNr"> 49 </span>    result <span class="Special">&lt;-</span> index *buf, current-event-index
-<span id="L50" class="LineNr"> 50 </span>    current-event-index <span class="Special">&lt;-</span> add current-event-index,<span class="Constant"> 1</span>
-<span id="L51" class="LineNr"> 51 </span>    *console <span class="Special">&lt;-</span> put *console, <span class="Constant">current-event-index:offset</span>, current-event-index
-<span id="L52" class="LineNr"> 52 </span>    <span class="muControl">return</span> result, <span class="Constant">1/found</span>, <span class="Constant">0/quit</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='084console.mu.html#L23'>console</a>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> current-event-index:num <span class="Special">&lt;-</span> get *console, <span class="Constant">current-event-index:offset</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span> buf:&amp;:@:<a href='084console.mu.html#L4'>event</a> <span class="Special">&lt;-</span> get *console, <span class="Constant">events:offset</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> max:num <span class="Special">&lt;-</span> length *buf
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal current-event-index, max
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> done?
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> dummy:&amp;:<a href='084console.mu.html#L4'>event</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='084console.mu.html#L4'>event</a>:type</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">return</span> *dummy, <span class="Constant">1/found</span>, <span class="Constant">1/quit</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> index *buf, current-event-index
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> current-event-index <span class="Special">&lt;-</span> add current-event-index,<span class="Constant"> 1</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> *console <span class="Special">&lt;-</span> put *console, <span class="Constant">current-event-index:offset</span>, current-event-index
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> result, <span class="Constant">1/found</span>, <span class="Constant">0/quit</span>
 <span id="L53" class="LineNr"> 53 </span>  <span class="Delimiter">}</span>
 <span id="L54" class="LineNr"> 54 </span>  switch  <span class="Comment"># real event source is infrequent; avoid polling it too much</span>
 <span id="L55" class="LineNr"> 55 </span>  result:<a href='084console.mu.html#L4'>event</a>, found?:bool <span class="Special">&lt;-</span> check-for-interaction
@@ -133,13 +134,13 @@ if ('onhashchange' in window) {
 <span id="L74" class="LineNr"> 74 </span>  <span class="Constant">local-scope</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Constant">load-ingredients</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Delimiter">{</span>
-<span id="L77" class="LineNr"> 77 </span>    c:char, found?:bool, quit?:bool, <a href='084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
-<span id="L78" class="LineNr"> 78 </span>    <span class="muControl">loop-unless</span> found?
-<span id="L79" class="LineNr"> 79 </span>    <span class="muControl">break-if</span> quit?
-<span id="L80" class="LineNr"> 80 </span>    assert c, <span class="Constant">[invalid <a href='084console.mu.html#L4'>event</a>, expected text]</span>
-<span id="L81" class="LineNr"> 81 </span>    <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, c
-<span id="L82" class="LineNr"> 82 </span>    chan <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> chan, c
-<span id="L83" class="LineNr"> 83 </span>    <span class="muControl">loop</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> c:char, found?:bool, quit?:bool, <a href='084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> found?
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> quit?
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> assert c, <span class="Constant">[invalid <a href='084console.mu.html#L4'>event</a>, expected text]</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, c
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> chan <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> chan, c
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Delimiter">}</span>
 <span id="L85" class="LineNr"> 85 </span>  chan <span class="Special">&lt;-</span> close chan
 <span id="L86" class="LineNr"> 86 </span>]
@@ -148,10 +149,10 @@ if ('onhashchange' in window) {
 <span id="L89" class="LineNr"> 89 </span>  <span class="Constant">local-scope</span>
 <span id="L90" class="LineNr"> 90 </span>  <span class="Constant">load-ingredients</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Delimiter">{</span>
-<span id="L92" class="LineNr"> 92 </span>    _, found?:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L35'>read-event</a> <a href='084console.mu.html#L23'>console</a>
-<span id="L93" class="LineNr"> 93 </span>    <span class="muControl">break-if</span> found?
-<span id="L94" class="LineNr"> 94 </span>    switch
-<span id="L95" class="LineNr"> 95 </span>    <span class="muControl">loop</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> _, found?:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L35'>read-event</a> <a href='084console.mu.html#L23'>console</a>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> switch
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L96" class="LineNr"> 96 </span>  <span class="Delimiter">}</span>
 <span id="L97" class="LineNr"> 97 </span>]
 <span id="L98" class="LineNr"> 98 </span>
diff --git a/html/085scenario_console.cc.html b/html/085scenario_console.cc.html
index 869ec321..a287499b 100644
--- a/html/085scenario_console.cc.html
+++ b/html/085scenario_console.cc.html
@@ -16,8 +16,9 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .muScenario { color: #00af00; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
@@ -72,24 +73,24 @@ if ('onhashchange' in window) {
 <span id="L12" class="LineNr"> 12 </span><span class="Delimiter">:(scenario keyboard_in_scenario)</span>
 <span id="L13" class="LineNr"> 13 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> keyboard-in-scenario [
 <span id="L14" class="LineNr"> 14 </span>  assume-console [
-<span id="L15" class="LineNr"> 15 </span>    type [abc]
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span> type [abc]
 <span id="L16" class="LineNr"> 16 </span>  ]
 <span id="L17" class="LineNr"> 17 </span>  run [
-<span id="L18" class="LineNr"> 18 </span>    <span class="Constant">1</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">2</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
-<span id="L19" class="LineNr"> 19 </span>    <span class="Constant">3</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">4</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
-<span id="L20" class="LineNr"> 20 </span>    <span class="Constant">5</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">6</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
-<span id="L21" class="LineNr"> 21 </span>    <span class="Constant">7</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">8</span>:<span class="Normal">bool</span><span class="Delimiter">,</span> <span class="Constant">9</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">2</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">4</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <span class="Constant">5</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">6</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Constant">7</span>:<span class="Normal">char</span><span class="Delimiter">,</span> <span class="Constant">8</span>:<span class="Normal">bool</span><span class="Delimiter">,</span> <span class="Constant">9</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>read-key console
 <span id="L22" class="LineNr"> 22 </span>  ]
 <span id="L23" class="LineNr"> 23 </span>  memory-should-contain [
-<span id="L24" class="LineNr"> 24 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">97</span>  <span class="Comment"># 'a'</span>
-<span id="L25" class="LineNr"> 25 </span>    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
-<span id="L26" class="LineNr"> 26 </span>    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">98</span>  <span class="Comment"># 'b'</span>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
-<span id="L28" class="LineNr"> 28 </span>    <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">99</span>  <span class="Comment"># 'c'</span>
-<span id="L29" class="LineNr"> 29 </span>    <span class="Constant">6</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
-<span id="L30" class="LineNr"> 30 </span>    <span class="Constant">7</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unset</span>
-<span id="L31" class="LineNr"> 31 </span>    <span class="Constant">8</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
-<span id="L32" class="LineNr"> 32 </span>    <span class="Constant">9</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># end of test events</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">97</span>  <span class="Comment"># 'a'</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">98</span>  <span class="Comment"># 'b'</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">99</span>  <span class="Comment"># 'c'</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="Constant">6</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="Constant">7</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unset</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <span class="Constant">8</span><span class="Special"> &lt;- </span><span class="Constant">1</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Constant">9</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># end of test events</span>
 <span id="L33" class="LineNr"> 33 </span>  ]
 <span id="L34" class="LineNr"> 34 </span>]
 <span id="L35" class="LineNr"> 35 </span>
@@ -124,54 +125,54 @@ if ('onhashchange' in window) {
 <span id="L64" class="LineNr"> 64 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> event_data_address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> num_events<span class="Delimiter">);</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Normal">int</span> curr_address = event_data_address + <span class="Comment">/*</span><span class="Comment">skip refcount and length</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>
 <span id="L66" class="LineNr"> 66 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Normal">const</span> instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;left-click&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr"> 69 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'left-click' event starting at &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>alloc &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L70" class="LineNr"> 70 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'touch-event' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L71" class="LineNr"> 71 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+<span class="Comment">/*</span><span class="Comment">offset of 'type' in 'mouse-event'</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">,</span> TB_KEY_MOUSE_LEFT<span class="Delimiter">);</span>
-<span id="L72" class="LineNr"> 72 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+<span class="Comment">/*</span><span class="Comment">offset of 'row' in 'mouse-event'</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L73" class="LineNr"> 73 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+<span class="Comment">/*</span><span class="Comment">offset of 'column' in 'mouse-event'</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">,</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">));</span>
-<span id="L74" class="LineNr"> 74 </span>      curr_address += <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>
-<span id="L75" class="LineNr"> 75 </span>    <span class="Delimiter">}</span>
-<span id="L76" class="LineNr"> 76 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;press&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L77" class="LineNr"> 77 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'press' event starting at &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L78" class="LineNr"> 78 </span>      string key = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
-<span id="L79" class="LineNr"> 79 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>key<span class="Delimiter">))</span>
-<span id="L80" class="LineNr"> 80 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Constant">1</span><span class="Delimiter">,</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>key<span class="Delimiter">));</span>
-<span id="L81" class="LineNr"> 81 </span>      <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Key<span class="Delimiter">,</span> key<span class="Delimiter">))</span>
-<span id="L82" class="LineNr"> 82 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Constant">1</span><span class="Delimiter">,</span> Key[key]<span class="Delimiter">);</span>
-<span id="L83" class="LineNr"> 83 </span>      <span class="Normal">else</span>
-<span id="L84" class="LineNr"> 84 </span>        <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;assume-console: can't press '&quot;</span> &lt;&lt; key &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L85" class="LineNr"> 85 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Constant">1</span><span class="Delimiter">)</span> &lt; <span class="Constant">256</span><span class="Delimiter">)</span>
-<span id="L86" class="LineNr"> 86 </span>        <span class="Comment">// these keys are in ascii</span>
-<span id="L87" class="LineNr"> 87 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'text' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L88" class="LineNr"> 88 </span>      <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L89" class="LineNr"> 89 </span>        <span class="Comment">// distinguish from unicode</span>
-<span id="L90" class="LineNr"> 90 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'keycode' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L91" class="LineNr"> 91 </span>      <span class="Delimiter">}</span>
-<span id="L92" class="LineNr"> 92 </span>      curr_address += <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>
-<span id="L93" class="LineNr"> 93 </span>    <span class="Delimiter">}</span>
-<span id="L94" class="LineNr"> 94 </span>    <span class="Comment">// End Event Handlers</span>
-<span id="L95" class="LineNr"> 95 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>      <span class="Comment">// keyboard input</span>
-<span id="L97" class="LineNr"> 97 </span>      assert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;type&quot;</span><span class="Delimiter">);</span>
-<span id="L98" class="LineNr"> 98 </span>      <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'type' event starting at &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L99" class="LineNr"> 99 </span>      <span class="Normal">const</span> string&amp; contents = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
-<span id="L100" class="LineNr">100 </span>      <span class="Normal">const</span> <span class="Normal">char</span>* raw_contents = contents<span class="Delimiter">.</span>c_str<span class="Delimiter">();</span>
-<span id="L101" class="LineNr">101 </span>      <span class="Normal">int</span> num_keyboard_events = <a href='038new_text.cc.html#L131'>unicode_length</a><span class="Delimiter">(</span>contents<span class="Delimiter">);</span>
-<span id="L102" class="LineNr">102 </span>      <span class="Normal">int</span> curr = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L103" class="LineNr">103 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; num_keyboard_events<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L104" class="LineNr">104 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'text' tag at &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L105" class="LineNr">105 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'text' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L106" class="LineNr">106 </span>        <span class="Normal">uint32_t</span> curr_character<span class="Delimiter">;</span>
-<span id="L107" class="LineNr">107 </span>        assert<span class="Delimiter">(</span>curr &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">));</span>
-<span id="L108" class="LineNr">108 </span>        tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;curr_character<span class="Delimiter">,</span> &amp;raw_contents[curr]<span class="Delimiter">);</span>
-<span id="L109" class="LineNr">109 </span>        <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing character &quot;</span> &lt;&lt; curr_character &lt;&lt; <span class="Constant">&quot; at &quot;</span> &lt;&lt; curr_address+<span class="Comment">/*</span><span class="Comment">skip exclusive container tag</span><span class="Comment">*/</span><span class="Constant">1</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L110" class="LineNr">110 </span>        <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip exclusive container tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> curr_character<span class="Delimiter">);</span>
-<span id="L111" class="LineNr">111 </span>        curr += tb_utf8_char_length<span class="Delimiter">(</span>raw_contents[curr]<span class="Delimiter">);</span>
-<span id="L112" class="LineNr">112 </span>        curr_address += <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>
-<span id="L113" class="LineNr">113 </span>      <span class="Delimiter">}</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Delimiter">}</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;left-click&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'left-click' event starting at &quot;</span> &lt;&lt; Current_routine<span class="Delimiter">-&gt;</span>alloc &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'touch-event' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+<span class="Comment">/*</span><span class="Comment">offset of 'type' in 'mouse-event'</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">,</span> TB_KEY_MOUSE_LEFT<span class="Delimiter">);</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+<span class="Comment">/*</span><span class="Comment">offset of 'row' in 'mouse-event'</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip tag</span><span class="Comment">*/</span><span class="Constant">1</span>+<span class="Comment">/*</span><span class="Comment">offset of 'column' in 'mouse-event'</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">,</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>name<span class="Delimiter">));</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_address += <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;press&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'press' event starting at &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> string key = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='002test.cc.html#L86'>is_integer</a><span class="Delimiter">(</span>key<span class="Delimiter">))</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Constant">1</span><span class="Delimiter">,</span> <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>key<span class="Delimiter">));</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Key<span class="Delimiter">,</span> key<span class="Delimiter">))</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Constant">1</span><span class="Delimiter">,</span> Key[key]<span class="Delimiter">);</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;assume-console: can't press '&quot;</span> &lt;&lt; key &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Constant">1</span><span class="Delimiter">)</span> &lt; <span class="Constant">256</span><span class="Delimiter">)</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// these keys are in ascii</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'text' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// distinguish from unicode</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'keycode' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_address += <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Event Handlers</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// keyboard input</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;type&quot;</span><span class="Delimiter">);</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'type' event starting at &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> string&amp; contents = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">;</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> <span class="Normal">char</span>* raw_contents = contents<span class="Delimiter">.</span>c_str<span class="Delimiter">();</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> num_keyboard_events = <a href='038new_text.cc.html#L131'>unicode_length</a><span class="Delimiter">(</span>contents<span class="Delimiter">);</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> curr = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; num_keyboard_events<span class="Delimiter">;</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing 'text' tag at &quot;</span> &lt;&lt; curr_address &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">tag for 'text' variant of 'event' exclusive-container</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">uint32_t</span> curr_character<span class="Delimiter">;</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">));</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_utf8_char_to_unicode<span class="Delimiter">(</span>&amp;curr_character<span class="Delimiter">,</span> &amp;raw_contents[curr]<span class="Delimiter">);</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing character &quot;</span> &lt;&lt; curr_character &lt;&lt; <span class="Constant">&quot; at &quot;</span> &lt;&lt; curr_address+<span class="Comment">/*</span><span class="Comment">skip exclusive container tag</span><span class="Comment">*/</span><span class="Constant">1</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr_address+<span class="Comment">/*</span><span class="Comment">skip exclusive container tag</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> curr_character<span class="Delimiter">);</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr += tb_utf8_char_length<span class="Delimiter">(</span>raw_contents[curr]<span class="Delimiter">);</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr_address += <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L115" class="LineNr">115 </span>  <span class="Delimiter">}</span>
 <span id="L116" class="LineNr">116 </span>  assert<span class="Delimiter">(</span>curr_address == event_data_address+size<span class="Delimiter">);</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Comment">// wrap the array of events in a console object</span>
@@ -264,49 +265,49 @@ if ('onhashchange' in window) {
 <span id="L204" class="LineNr">204 </span><span class="Delimiter">:(scenario events_in_scenario)</span>
 <span id="L205" class="LineNr">205 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> events-in-scenario [
 <span id="L206" class="LineNr">206 </span>  assume-console [
-<span id="L207" class="LineNr">207 </span>    type [abc]
-<span id="L208" class="LineNr">208 </span>    left-click <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span>
-<span id="L209" class="LineNr">209 </span>    press up-arrow
-<span id="L210" class="LineNr">210 </span>    type [d]
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> type [abc]
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> left-click <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> press up-arrow
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> type [d]
 <span id="L211" class="LineNr">211 </span>  ]
 <span id="L212" class="LineNr">212 </span>  run [
-<span id="L213" class="LineNr">213 </span>    <span class="Comment"># 3 keyboard events; each event occupies 4 locations</span>
-<span id="L214" class="LineNr">214 </span>    <span class="Constant">1</span>:event<span class="Special"> &lt;- </span>read-event console
-<span id="L215" class="LineNr">215 </span>    <span class="Constant">5</span>:event<span class="Special"> &lt;- </span>read-event console
-<span id="L216" class="LineNr">216 </span>    <span class="Constant">9</span>:event<span class="Special"> &lt;- </span>read-event console
-<span id="L217" class="LineNr">217 </span>    <span class="Comment"># mouse click</span>
-<span id="L218" class="LineNr">218 </span>    <span class="Constant">13</span>:event<span class="Special"> &lt;- </span>read-event console
-<span id="L219" class="LineNr">219 </span>    <span class="Comment"># non-character keycode</span>
-<span id="L220" class="LineNr">220 </span>    <span class="Constant">17</span>:event<span class="Special"> &lt;- </span>read-event console
-<span id="L221" class="LineNr">221 </span>    <span class="Comment"># final keyboard event</span>
-<span id="L222" class="LineNr">222 </span>    <span class="Constant">21</span>:event<span class="Special"> &lt;- </span>read-event console
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Comment"># 3 keyboard events; each event occupies 4 locations</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span>:event<span class="Special"> &lt;- </span>read-event console
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <span class="Constant">5</span>:event<span class="Special"> &lt;- </span>read-event console
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Constant">9</span>:event<span class="Special"> &lt;- </span>read-event console
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> <span class="Comment"># mouse click</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> <span class="Constant">13</span>:event<span class="Special"> &lt;- </span>read-event console
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Comment"># non-character keycode</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Constant">17</span>:event<span class="Special"> &lt;- </span>read-event console
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span> <span class="Comment"># final keyboard event</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Constant">21</span>:event<span class="Special"> &lt;- </span>read-event console
 <span id="L223" class="LineNr">223 </span>  ]
 <span id="L224" class="LineNr">224 </span>  memory-should-contain [
-<span id="L225" class="LineNr">225 </span>    <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
-<span id="L226" class="LineNr">226 </span>    <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">97</span>  <span class="Comment"># 'a'</span>
-<span id="L227" class="LineNr">227 </span>    <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L228" class="LineNr">228 </span>    <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L229" class="LineNr">229 </span>    <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
-<span id="L230" class="LineNr">230 </span>    <span class="Constant">6</span><span class="Special"> &lt;- </span><span class="Constant">98</span>  <span class="Comment"># 'b'</span>
-<span id="L231" class="LineNr">231 </span>    <span class="Constant">7</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L232" class="LineNr">232 </span>    <span class="Constant">8</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L233" class="LineNr">233 </span>    <span class="Constant">9</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
-<span id="L234" class="LineNr">234 </span>    <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">99</span>  <span class="Comment"># 'c'</span>
-<span id="L235" class="LineNr">235 </span>    <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L236" class="LineNr">236 </span>    <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L237" class="LineNr">237 </span>    <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">2</span>  <span class="Comment"># 'mouse'</span>
-<span id="L238" class="LineNr">238 </span>    <span class="Constant">14</span><span class="Special"> &lt;- </span><span class="Constant">65513</span>  <span class="Comment"># mouse click</span>
-<span id="L239" class="LineNr">239 </span>    <span class="Constant">15</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># row</span>
-<span id="L240" class="LineNr">240 </span>    <span class="Constant">16</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># column</span>
-<span id="L241" class="LineNr">241 </span>    <span class="Constant">17</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># 'keycode'</span>
-<span id="L242" class="LineNr">242 </span>    <span class="Constant">18</span><span class="Special"> &lt;- </span><span class="Constant">65517</span>  <span class="Comment"># up arrow</span>
-<span id="L243" class="LineNr">243 </span>    <span class="Constant">19</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L244" class="LineNr">244 </span>    <span class="Constant">20</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L245" class="LineNr">245 </span>    <span class="Constant">21</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
-<span id="L246" class="LineNr">246 </span>    <span class="Constant">22</span><span class="Special"> &lt;- </span><span class="Constant">100</span>  <span class="Comment"># 'd'</span>
-<span id="L247" class="LineNr">247 </span>    <span class="Constant">23</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L248" class="LineNr">248 </span>    <span class="Constant">24</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
-<span id="L249" class="LineNr">249 </span>    <span class="Constant">25</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
+<span id="L225" class="LineNr">225 </span>  <span class="Conceal">¦</span> <span class="Constant">1</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Constant">2</span><span class="Special"> &lt;- </span><span class="Constant">97</span>  <span class="Comment"># 'a'</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> <span class="Constant">3</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="Constant">4</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="Constant">5</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Constant">6</span><span class="Special"> &lt;- </span><span class="Constant">98</span>  <span class="Comment"># 'b'</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Constant">7</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <span class="Constant">8</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="Constant">9</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Constant">10</span><span class="Special"> &lt;- </span><span class="Constant">99</span>  <span class="Comment"># 'c'</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Constant">11</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> <span class="Constant">12</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <span class="Constant">13</span><span class="Special"> &lt;- </span><span class="Constant">2</span>  <span class="Comment"># 'mouse'</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> <span class="Constant">14</span><span class="Special"> &lt;- </span><span class="Constant">65513</span>  <span class="Comment"># mouse click</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> <span class="Constant">15</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># row</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span> <span class="Constant">16</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># column</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> <span class="Constant">17</span><span class="Special"> &lt;- </span><span class="Constant">1</span>  <span class="Comment"># 'keycode'</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> <span class="Constant">18</span><span class="Special"> &lt;- </span><span class="Constant">65517</span>  <span class="Comment"># up arrow</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> <span class="Constant">19</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Constant">20</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Constant">21</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># 'text'</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Constant">22</span><span class="Special"> &lt;- </span><span class="Constant">100</span>  <span class="Comment"># 'd'</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Constant">23</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Constant">24</span><span class="Special"> &lt;- </span><span class="Constant">0</span>  <span class="Comment"># unused</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Constant">25</span><span class="Special"> &lt;- </span><span class="Constant">0</span>
 <span id="L250" class="LineNr">250 </span>  ]
 <span id="L251" class="LineNr">251 </span>]
 <span id="L252" class="LineNr">252 </span>
@@ -324,17 +325,17 @@ if ('onhashchange' in window) {
 <span id="L264" class="LineNr">264 </span><span class="Normal">case</span> REPLACE_IN_CONSOLE: <span class="Delimiter">{</span>
 <span id="L265" class="LineNr">265 </span>  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)));</span>
 <span id="L266" class="LineNr">266 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!get_or_insert<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> CONSOLE<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L267" class="LineNr">267 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;console not initialized</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L268" class="LineNr">268 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;console not initialized</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L269" class="LineNr">269 </span>  <span class="Delimiter">}</span>
 <span id="L270" class="LineNr">270 </span>  <span class="Normal">int</span> console_address = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> CONSOLE<span class="Delimiter">);</span>
 <span id="L271" class="LineNr">271 </span>  <span class="Normal">int</span> console_data = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> console_address+<span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L272" class="LineNr">272 </span>  <span class="Normal">int</span> length = <a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> console_data<span class="Delimiter">);</span>  <span class="Comment">// array length</span>
 <span id="L273" class="LineNr">273 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">,</span> curr = console_data+<span class="Constant">1</span><span class="Delimiter">;</span>  i &lt; length<span class="Delimiter">;</span>  ++i<span class="Delimiter">,</span> curr+=size_of_event<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L274" class="LineNr">274 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> != <span class="Comment">/*</span><span class="Comment">text</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L275" class="LineNr">275 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr+<span class="Constant">1</span><span class="Delimiter">)</span> != ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L276" class="LineNr">276 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> n = <span class="Constant">0</span><span class="Delimiter">;</span>  n &lt; <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>  ++n<span class="Delimiter">)</span>
-<span id="L277" class="LineNr">277 </span>      <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr+n<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>n<span class="Delimiter">));</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> != <span class="Comment">/*</span><span class="Comment">text</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L275" class="LineNr">275 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L225'>get_or_insert</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr+<span class="Constant">1</span><span class="Delimiter">)</span> != ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> n = <span class="Constant">0</span><span class="Delimiter">;</span>  n &lt; <a href='085scenario_console.cc.html#L295'>size_of_event</a><span class="Delimiter">();</span>  ++n<span class="Delimiter">)</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr+n<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span>n<span class="Delimiter">));</span>
 <span id="L278" class="LineNr">278 </span>  <span class="Delimiter">}</span>
 <span id="L279" class="LineNr">279 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L280" class="LineNr">280 </span><span class="Delimiter">}</span>
@@ -343,11 +344,11 @@ if ('onhashchange' in window) {
 <span id="L283" class="LineNr">283 </span><span class="Normal">int</span> <a href='085scenario_console.cc.html#L283'>count_events</a><span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L284" class="LineNr">284 </span>  <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L285" class="LineNr">285 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>r<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L286" class="LineNr">286 </span>    <span class="Normal">const</span> instruction&amp; curr = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L287" class="LineNr">287 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;type&quot;</span><span class="Delimiter">)</span>
-<span id="L288" class="LineNr">288 </span>      result += <a href='038new_text.cc.html#L131'>unicode_length</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
-<span id="L289" class="LineNr">289 </span>    <span class="Normal">else</span>
-<span id="L290" class="LineNr">290 </span>      ++result<span class="Delimiter">;</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; curr = r<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr<span class="Delimiter">.</span>name == <span class="Constant">&quot;type&quot;</span><span class="Delimiter">)</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result += <a href='038new_text.cc.html#L131'>unicode_length</a><span class="Delimiter">(</span>curr<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">);</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++result<span class="Delimiter">;</span>
 <span id="L291" class="LineNr">291 </span>  <span class="Delimiter">}</span>
 <span id="L292" class="LineNr">292 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L293" class="LineNr">293 </span><span class="Delimiter">}</span>
diff --git a/html/086scenario_console_test.mu.html b/html/086scenario_console_test.mu.html
index 168959c4..3171d80d 100644
--- a/html/086scenario_console_test.mu.html
+++ b/html/086scenario_console_test.mu.html
@@ -15,11 +15,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muScenario { color: #00af00; }
 -->
 </style>
 
@@ -60,23 +61,23 @@ if ('onhashchange' in window) {
 <span id="L4" class="LineNr"> 4 </span>
 <span id="L5" class="LineNr"> 5 </span><span class="muScenario">scenario</span> read-key-in-mu [
 <span id="L6" class="LineNr"> 6 </span>  assume-console [
-<span id="L7" class="LineNr"> 7 </span>    type <span class="Constant">[abc]</span>
+<span id="L7" class="LineNr"> 7 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abc]</span>
 <span id="L8" class="LineNr"> 8 </span>  ]
 <span id="L9" class="LineNr"> 9 </span>  run [
-<span id="L10" class="LineNr">10 </span>    1:char, 2:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
-<span id="L11" class="LineNr">11 </span>    3:char, 4:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
-<span id="L12" class="LineNr">12 </span>    5:char, 6:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
-<span id="L13" class="LineNr">13 </span>    7:char, 8:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
+<span id="L10" class="LineNr">10 </span>  <span class="Conceal">¦</span> 1:char, 2:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
+<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span> 3:char, 4:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span> 5:char, 6:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> 7:char, 8:bool <span class="Special">&lt;-</span> <a href='084console.mu.html#L62'>read-key</a> <a href='084console.mu.html#L23'>console</a>
 <span id="L14" class="LineNr">14 </span>  ]
 <span id="L15" class="LineNr">15 </span>  memory-should-contain [
-<span id="L16" class="LineNr">16 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
-<span id="L17" class="LineNr">17 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L18" class="LineNr">18 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>  <span class="Comment"># 'b'</span>
-<span id="L19" class="LineNr">19 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L20" class="LineNr">20 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>  <span class="Comment"># 'c'</span>
-<span id="L21" class="LineNr">21 </span>   <span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L22" class="LineNr">22 </span>   <span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># eof</span>
-<span id="L23" class="LineNr">23 </span>   <span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L16" class="LineNr">16 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 97</span>  <span class="Comment"># 'a'</span>
+<span id="L17" class="LineNr">17 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L18" class="LineNr">18 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 98</span>  <span class="Comment"># 'b'</span>
+<span id="L19" class="LineNr">19 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 99</span>  <span class="Comment"># 'c'</span>
+<span id="L21" class="LineNr">21 </span>  <span class="Conceal">¦</span><span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L22" class="LineNr">22 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># eof</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Conceal">¦</span><span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L24" class="LineNr">24 </span>  ]
 <span id="L25" class="LineNr">25 </span>]
 </pre>
diff --git a/html/087file.cc.html b/html/087file.cc.html
index 4fd646d2..db5bacb8 100644
--- a/html/087file.cc.html
+++ b/html/087file.cc.html
@@ -16,13 +16,14 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .PreProc { color: #800080; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -75,20 +76,20 @@ if ('onhashchange' in window) {
 <span id="L16" class="LineNr"> 16 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L17" class="LineNr"> 17 </span><span class="Normal">case</span> _OPEN_FILE_FOR_READING: <span class="Delimiter">{</span>
 <span id="L18" class="LineNr"> 18 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L19" class="LineNr"> 19 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-reading' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L20" class="LineNr"> 20 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-reading' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L21" class="LineNr"> 21 </span>  <span class="Delimiter">}</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L23" class="LineNr"> 23 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-file-for-reading' should be a string, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L24" class="LineNr"> 24 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-file-for-reading' should be a string, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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 <span id="L26" class="LineNr"> 26 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L27" class="LineNr"> 27 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-reading' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L28" class="LineNr"> 28 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-reading' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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 <span id="L30" class="LineNr"> 30 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L31" class="LineNr"> 31 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-file-for-reading' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L32" class="LineNr"> 32 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-file-for-reading' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L33" class="LineNr"> 33 </span>  <span class="Delimiter">}</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L35" class="LineNr"> 35 </span><span class="Delimiter">}</span>
@@ -110,20 +111,20 @@ if ('onhashchange' in window) {
 <span id="L51" class="LineNr"> 51 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L52" class="LineNr"> 52 </span><span class="Normal">case</span> _OPEN_FILE_FOR_WRITING: <span class="Delimiter">{</span>
 <span id="L53" class="LineNr"> 53 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L54" class="LineNr"> 54 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-writing' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L55" class="LineNr"> 55 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-writing' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Delimiter">}</span>
 <span id="L57" class="LineNr"> 57 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L58" class="LineNr"> 58 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-file-for-writing' should be a string, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L59" class="LineNr"> 59 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-file-for-writing' should be a string, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Delimiter">}</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-writing' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-file-for-writing' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L64" class="LineNr"> 64 </span>  <span class="Delimiter">}</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-file-for-writing' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-file-for-writing' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Delimiter">}</span>
 <span id="L69" class="LineNr"> 69 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L70" class="LineNr"> 70 </span><span class="Delimiter">}</span>
@@ -144,24 +145,24 @@ if ('onhashchange' in window) {
 <span id="L85" class="LineNr"> 85 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L86" class="LineNr"> 86 </span><span class="Normal">case</span> _READ_FROM_FILE: <span class="Delimiter">{</span>
 <span id="L87" class="LineNr"> 87 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L88" class="LineNr"> 88 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-file' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L89" class="LineNr"> 89 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-file' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L90" class="LineNr"> 90 </span>  <span class="Delimiter">}</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L92" class="LineNr"> 92 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$read-from-file' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L93" class="LineNr"> 93 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$read-from-file' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Delimiter">}</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-file' requires exactly two products, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-file' requires exactly two products, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L98" class="LineNr"> 98 </span>  <span class="Delimiter">}</span>
 <span id="L99" class="LineNr"> 99 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_character<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L100" class="LineNr">100 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$read-from-file' should be a character, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$read-from-file' should be a character, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L104" class="LineNr">104 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second product of '$read-from-file' should be a boolean, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L105" class="LineNr">105 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second product of '$read-from-file' should be a boolean, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L106" class="LineNr">106 </span>  <span class="Delimiter">}</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L108" class="LineNr">108 </span><span class="Delimiter">}</span>
@@ -170,29 +171,29 @@ if ('onhashchange' in window) {
 <span id="L111" class="LineNr">111 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> x = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L112" class="LineNr">112 </span>  <span class="Normal">FILE</span>* f = <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">FILE</span>*&gt;<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>f == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr">114 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;can't read from null file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;can't read from null file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Delimiter">}</span>
 <span id="L117" class="LineNr">117 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>feof<span class="Delimiter">(</span>f<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L120" class="LineNr">120 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// eof</span>
-<span id="L121" class="LineNr">121 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// eof</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Delimiter">}</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ferror<span class="Delimiter">(</span>f<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L124" class="LineNr">124 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;file in invalid state in '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L125" class="LineNr">125 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;file in invalid state in '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L126" class="LineNr">126 </span>  <span class="Delimiter">}</span>
 <span id="L127" class="LineNr">127 </span>  <span class="Normal">char</span> c = getc<span class="Delimiter">(</span>f<span class="Delimiter">);</span>  <span class="Comment">// todo: unicode</span>
 <span id="L128" class="LineNr">128 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">EOF</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L129" class="LineNr">129 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L130" class="LineNr">130 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// eof</span>
-<span id="L131" class="LineNr">131 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// eof</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L132" class="LineNr">132 </span>  <span class="Delimiter">}</span>
 <span id="L133" class="LineNr">133 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ferror<span class="Delimiter">(</span>f<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L134" class="LineNr">134 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;couldn't read from file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L135" class="LineNr">135 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  errno: &quot;</span> &lt;&lt; errno &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L136" class="LineNr">136 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;couldn't read from file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  errno: &quot;</span> &lt;&lt; errno &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Delimiter">}</span>
 <span id="L138" class="LineNr">138 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
 <span id="L139" class="LineNr">139 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// not eof</span>
@@ -208,20 +209,20 @@ if ('onhashchange' in window) {
 <span id="L149" class="LineNr">149 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L150" class="LineNr">150 </span><span class="Normal">case</span> _WRITE_TO_FILE: <span class="Delimiter">{</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L152" class="LineNr">152 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$write-to-file' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L153" class="LineNr">153 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$write-to-file' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L154" class="LineNr">154 </span>  <span class="Delimiter">}</span>
 <span id="L155" class="LineNr">155 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L156" class="LineNr">156 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$write-to-file' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L157" class="LineNr">157 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$write-to-file' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L158" class="LineNr">158 </span>  <span class="Delimiter">}</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_character<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L160" class="LineNr">160 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of '$write-to-file' should be a character, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L161" class="LineNr">161 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of '$write-to-file' should be a character, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Delimiter">}</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$write-to-file' writes to no products, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L165" class="LineNr">165 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$write-to-file' writes to no products, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L166" class="LineNr">166 </span>  <span class="Delimiter">}</span>
 <span id="L167" class="LineNr">167 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L168" class="LineNr">168 </span><span class="Delimiter">}</span>
@@ -230,21 +231,21 @@ if ('onhashchange' in window) {
 <span id="L171" class="LineNr">171 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> x = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Normal">FILE</span>* f = <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">FILE</span>*&gt;<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>f == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L174" class="LineNr">174 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;can't write to null file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L175" class="LineNr">175 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;can't write to null file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Delimiter">}</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>feof<span class="Delimiter">(</span>f<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L178" class="LineNr">178 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ferror<span class="Delimiter">(</span>f<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L179" class="LineNr">179 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;file in invalid state in '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L180" class="LineNr">180 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;file in invalid state in '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L181" class="LineNr">181 </span>  <span class="Delimiter">}</span>
 <span id="L182" class="LineNr">182 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> y = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L183" class="LineNr">183 </span>  <span class="Normal">char</span> c = <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>y<span class="Delimiter">);</span>
 <span id="L184" class="LineNr">184 </span>  putc<span class="Delimiter">(</span>c<span class="Delimiter">,</span> f<span class="Delimiter">);</span>  <span class="Comment">// todo: unicode</span>
 <span id="L185" class="LineNr">185 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>ferror<span class="Delimiter">(</span>f<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L186" class="LineNr">186 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;couldn't write to file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L187" class="LineNr">187 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  errno: &quot;</span> &lt;&lt; errno &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L188" class="LineNr">188 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;couldn't write to file in '&quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>current_instruction<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;  errno: &quot;</span> &lt;&lt; errno &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L189" class="LineNr">189 </span>  <span class="Delimiter">}</span>
 <span id="L190" class="LineNr">190 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L191" class="LineNr">191 </span><span class="Delimiter">}</span>
@@ -256,20 +257,20 @@ if ('onhashchange' in window) {
 <span id="L197" class="LineNr">197 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L198" class="LineNr">198 </span><span class="Normal">case</span> _CLOSE_FILE: <span class="Delimiter">{</span>
 <span id="L199" class="LineNr">199 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L200" class="LineNr">200 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-file' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L201" class="LineNr">201 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-file' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L202" class="LineNr">202 </span>  <span class="Delimiter">}</span>
 <span id="L203" class="LineNr">203 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L204" class="LineNr">204 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$close-file' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L205" class="LineNr">205 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$close-file' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L206" class="LineNr">206 </span>  <span class="Delimiter">}</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L208" class="LineNr">208 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-file' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L209" class="LineNr">209 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-file' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L210" class="LineNr">210 </span>  <span class="Delimiter">}</span>
 <span id="L211" class="LineNr">211 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name != inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L212" class="LineNr">212 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-file' requires its product to be the same as its ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L213" class="LineNr">213 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-file' requires its product to be the same as its ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Delimiter">}</span>
 <span id="L215" class="LineNr">215 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L216" class="LineNr">216 </span><span class="Delimiter">}</span>
diff --git a/html/088file.mu.html b/html/088file.mu.html
index 6025332d..30eaf372 100644
--- a/html/088file.mu.html
+++ b/html/088file.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -82,10 +83,10 @@ if ('onhashchange' in window) {
 <span id="L23" class="LineNr"> 23 </span>  <span class="Constant">load-ingredients</span>
 <span id="L24" class="LineNr"> 24 </span>  error? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
 <span id="L25" class="LineNr"> 25 </span>  <span class="Delimiter">{</span>
-<span id="L26" class="LineNr"> 26 </span>    <span class="muControl">break-unless</span> <a href='088file.mu.html#L11'>resources</a>
-<span id="L27" class="LineNr"> 27 </span>    <span class="Comment"># fake file system</span>
-<span id="L28" class="LineNr"> 28 </span>    contents, error? <span class="Special">&lt;-</span> <a href='088file.mu.html#L53'>start-reading-from-fake-resource</a> <a href='088file.mu.html#L11'>resources</a>, filename
-<span id="L29" class="LineNr"> 29 </span>    <span class="muControl">return</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='088file.mu.html#L11'>resources</a>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span> <span class="Comment"># fake file system</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> contents, error? <span class="Special">&lt;-</span> <a href='088file.mu.html#L53'>start-reading-from-fake-resource</a> <a href='088file.mu.html#L11'>resources</a>, filename
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L30" class="LineNr"> 30 </span>  <span class="Delimiter">}</span>
 <span id="L31" class="LineNr"> 31 </span>  <span class="Comment"># real file system</span>
 <span id="L32" class="LineNr"> 32 </span>  file:num <span class="Special">&lt;-</span> $open-file-for-reading filename
@@ -101,10 +102,10 @@ if ('onhashchange' in window) {
 <span id="L42" class="LineNr"> 42 </span>  <span class="muControl">return-if</span> error?, <span class="Constant">0/contents</span>
 <span id="L43" class="LineNr"> 43 </span>  buf:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a> <span class="Constant">30/capacity</span>
 <span id="L44" class="LineNr"> 44 </span>  <span class="Delimiter">{</span>
-<span id="L45" class="LineNr"> 45 </span>    c:char, done?:bool, source <span class="Special">&lt;-</span> read source
-<span id="L46" class="LineNr"> 46 </span>    <span class="muControl">break-if</span> done?
-<span id="L47" class="LineNr"> 47 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L48" class="LineNr"> 48 </span>    <span class="muControl">loop</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> c:char, done?:bool, source <span class="Special">&lt;-</span> read source
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Delimiter">}</span>
 <span id="L50" class="LineNr"> 50 </span>  contents <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> buf
 <span id="L51" class="LineNr"> 51 </span>]
@@ -117,17 +118,17 @@ if ('onhashchange' in window) {
 <span id="L58" class="LineNr"> 58 </span>  data:&amp;:@:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> get *resources, <span class="Constant">data:offset</span>
 <span id="L59" class="LineNr"> 59 </span>  len:num <span class="Special">&lt;-</span> length *data
 <span id="L60" class="LineNr"> 60 </span>  <span class="Delimiter">{</span>
-<span id="L61" class="LineNr"> 61 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L62" class="LineNr"> 62 </span>    <span class="muControl">break-if</span> done?
-<span id="L63" class="LineNr"> 63 </span>    tmp:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> index *data, i
-<span id="L64" class="LineNr"> 64 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L65" class="LineNr"> 65 </span>    curr-resource:text <span class="Special">&lt;-</span> get tmp, <span class="Constant">name:offset</span>
-<span id="L66" class="LineNr"> 66 </span>    found?:bool <span class="Special">&lt;-</span> equal <a href='088file.mu.html#L16'>resource</a>, curr-resource
-<span id="L67" class="LineNr"> 67 </span>    <span class="muControl">loop-unless</span> found?
-<span id="L68" class="LineNr"> 68 </span>    contents:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a><span class="Constant"> 30</span>
-<span id="L69" class="LineNr"> 69 </span>    curr-contents:text <span class="Special">&lt;-</span> get tmp, <span class="Constant">contents:offset</span>
-<span id="L70" class="LineNr"> 70 </span>    start-running <a href='088file.mu.html#L89'>receive-from-text</a> curr-contents, sink
-<span id="L71" class="LineNr"> 71 </span>    <span class="muControl">return</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> tmp:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> index *data, i
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> curr-resource:text <span class="Special">&lt;-</span> get tmp, <span class="Constant">name:offset</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> equal <a href='088file.mu.html#L16'>resource</a>, curr-resource
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> found?
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> contents:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a><span class="Constant"> 30</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> curr-contents:text <span class="Special">&lt;-</span> get tmp, <span class="Constant">contents:offset</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> start-running <a href='088file.mu.html#L89'>receive-from-text</a> curr-contents, sink
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L72" class="LineNr"> 72 </span>  <span class="Delimiter">}</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="muControl">return</span> <span class="Constant">0/not-found</span>, <span class="Constant">1/error</span>
 <span id="L74" class="LineNr"> 74 </span>]
@@ -136,10 +137,10 @@ if ('onhashchange' in window) {
 <span id="L77" class="LineNr"> 77 </span>  <span class="Constant">local-scope</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Constant">load-ingredients</span>
 <span id="L79" class="LineNr"> 79 </span>  <span class="Delimiter">{</span>
-<span id="L80" class="LineNr"> 80 </span>    c:char, eof?:bool <span class="Special">&lt;-</span> $read-from-file file
-<span id="L81" class="LineNr"> 81 </span>    <span class="muControl">break-if</span> eof?
-<span id="L82" class="LineNr"> 82 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, c
-<span id="L83" class="LineNr"> 83 </span>    <span class="muControl">loop</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> c:char, eof?:bool <span class="Special">&lt;-</span> $read-from-file file
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> eof?
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, c
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L84" class="LineNr"> 84 </span>  <span class="Delimiter">}</span>
 <span id="L85" class="LineNr"> 85 </span>  sink <span class="Special">&lt;-</span> close sink
 <span id="L86" class="LineNr"> 86 </span>  file <span class="Special">&lt;-</span> $close-file file
@@ -151,12 +152,12 @@ if ('onhashchange' in window) {
 <span id="L92" class="LineNr"> 92 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L93" class="LineNr"> 93 </span>  len:num <span class="Special">&lt;-</span> length *contents
 <span id="L94" class="LineNr"> 94 </span>  <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L96" class="LineNr"> 96 </span>    <span class="muControl">break-if</span> done?
-<span id="L97" class="LineNr"> 97 </span>    c:char <span class="Special">&lt;-</span> index *contents, i
-<span id="L98" class="LineNr"> 98 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, c
-<span id="L99" class="LineNr"> 99 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L100" class="LineNr">100 </span>    <span class="muControl">loop</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *contents, i
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, c
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L101" class="LineNr">101 </span>  <span class="Delimiter">}</span>
 <span id="L102" class="LineNr">102 </span>  sink <span class="Special">&lt;-</span> close sink
 <span id="L103" class="LineNr">103 </span>]
@@ -167,18 +168,18 @@ if ('onhashchange' in window) {
 <span id="L108" class="LineNr">108 </span>  error? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
 <span id="L109" class="LineNr">109 </span>  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a><span class="Constant"> 30</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Delimiter">{</span>
-<span id="L111" class="LineNr">111 </span>    <span class="muControl">break-unless</span> <a href='088file.mu.html#L11'>resources</a>
-<span id="L112" class="LineNr">112 </span>    <span class="Comment"># fake file system</span>
-<span id="L113" class="LineNr">113 </span>    routine-id <span class="Special">&lt;-</span> start-running <a href='088file.mu.html#L162'>transmit-to-fake-resource</a> <a href='088file.mu.html#L11'>resources</a>, filename, source
-<span id="L114" class="LineNr">114 </span>    <span class="muControl">return</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='088file.mu.html#L11'>resources</a>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Comment"># fake file system</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> routine-id <span class="Special">&lt;-</span> start-running <a href='088file.mu.html#L162'>transmit-to-fake-resource</a> <a href='088file.mu.html#L11'>resources</a>, filename, source
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L115" class="LineNr">115 </span>  <span class="Delimiter">}</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Comment"># real file system</span>
 <span id="L117" class="LineNr">117 </span>  file:num <span class="Special">&lt;-</span> $open-file-for-writing filename
 <span id="L118" class="LineNr">118 </span>  <span class="muControl">return-unless</span> file, <span class="Constant">0/sink</span>, <span class="Constant">0/routine-id</span>, <span class="Constant">1/error?</span>
 <span id="L119" class="LineNr">119 </span>  <span class="Delimiter">{</span>
-<span id="L120" class="LineNr">120 </span>    <span class="muControl">break-if</span> file
-<span id="L121" class="LineNr">121 </span>    msg:text <span class="Special">&lt;-</span> append <span class="Constant">[no such file: ]</span> filename
-<span id="L122" class="LineNr">122 </span>    assert file, msg
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> file
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> msg:text <span class="Special">&lt;-</span> append <span class="Constant">[no such file: ]</span> filename
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> assert file, msg
 <span id="L123" class="LineNr">123 </span>  <span class="Delimiter">}</span>
 <span id="L124" class="LineNr">124 </span>  routine-id <span class="Special">&lt;-</span> start-running <a href='088file.mu.html#L150'>transmit-to-file</a> file, source
 <span id="L125" class="LineNr">125 </span>]
@@ -193,12 +194,12 @@ if ('onhashchange' in window) {
 <span id="L134" class="LineNr">134 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L135" class="LineNr">135 </span>  len:num <span class="Special">&lt;-</span> length *contents
 <span id="L136" class="LineNr">136 </span>  <span class="Delimiter">{</span>
-<span id="L137" class="LineNr">137 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L138" class="LineNr">138 </span>    <span class="muControl">break-if</span> done?
-<span id="L139" class="LineNr">139 </span>    c:char <span class="Special">&lt;-</span> index *contents, i
-<span id="L140" class="LineNr">140 </span>    sink-file <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink-file, c
-<span id="L141" class="LineNr">141 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L142" class="LineNr">142 </span>    <span class="muControl">loop</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *contents, i
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> sink-file <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink-file, c
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L143" class="LineNr">143 </span>  <span class="Delimiter">}</span>
 <span id="L144" class="LineNr">144 </span>  close sink-file
 <span id="L145" class="LineNr">145 </span>  <span class="Comment"># make sure to wait for the file to be actually written to disk</span>
@@ -210,10 +211,10 @@ if ('onhashchange' in window) {
 <span id="L151" class="LineNr">151 </span>  <span class="Constant">local-scope</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Constant">load-ingredients</span>
 <span id="L153" class="LineNr">153 </span>  <span class="Delimiter">{</span>
-<span id="L154" class="LineNr">154 </span>    c:char, done?:bool, source <span class="Special">&lt;-</span> read source
-<span id="L155" class="LineNr">155 </span>    <span class="muControl">break-if</span> done?
-<span id="L156" class="LineNr">156 </span>    $write-to-file file, c
-<span id="L157" class="LineNr">157 </span>    <span class="muControl">loop</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> c:char, done?:bool, source <span class="Special">&lt;-</span> read source
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> $write-to-file file, c
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L158" class="LineNr">158 </span>  <span class="Delimiter">}</span>
 <span id="L159" class="LineNr">159 </span>  file <span class="Special">&lt;-</span> $close-file file
 <span id="L160" class="LineNr">160 </span>]
@@ -226,10 +227,10 @@ if ('onhashchange' in window) {
 <span id="L167" class="LineNr">167 </span>  <span class="Comment"># compute new file contents</span>
 <span id="L168" class="LineNr">168 </span>  buf:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a><span class="Constant"> 30</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>    c:char, done?:bool, source <span class="Special">&lt;-</span> read source
-<span id="L171" class="LineNr">171 </span>    <span class="muControl">break-if</span> done?
-<span id="L172" class="LineNr">172 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L173" class="LineNr">173 </span>    <span class="muControl">loop</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> c:char, done?:bool, source <span class="Special">&lt;-</span> read source
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L174" class="LineNr">174 </span>  <span class="Delimiter">}</span>
 <span id="L175" class="LineNr">175 </span>  contents:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> buf
 <span id="L176" class="LineNr">176 </span>  new-resource:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> merge filename, contents
@@ -240,18 +241,18 @@ if ('onhashchange' in window) {
 <span id="L181" class="LineNr">181 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L182" class="LineNr">182 </span>  len:num <span class="Special">&lt;-</span> length *data
 <span id="L183" class="LineNr">183 </span>  <span class="Delimiter">{</span>
-<span id="L184" class="LineNr">184 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L185" class="LineNr">185 </span>    <span class="muControl">break-if</span> done?
-<span id="L186" class="LineNr">186 </span>    tmp:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> index *data, i
-<span id="L187" class="LineNr">187 </span>    curr-filename <span class="Special">&lt;-</span> get tmp, <span class="Constant">name:offset</span>
-<span id="L188" class="LineNr">188 </span>    found?:bool <span class="Special">&lt;-</span> equal filename, curr-filename
-<span id="L189" class="LineNr">189 </span>    <span class="Delimiter">{</span>
-<span id="L190" class="LineNr">190 </span>      <span class="muControl">break-unless</span> found?
-<span id="L191" class="LineNr">191 </span>      put-index *data, i, new-resource
-<span id="L192" class="LineNr">192 </span>      <span class="muControl">jump</span> <span class="Constant">+unlock-and-exit</span>
-<span id="L193" class="LineNr">193 </span>    <span class="Delimiter">}</span>
-<span id="L194" class="LineNr">194 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L195" class="LineNr">195 </span>    <span class="muControl">loop</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> tmp:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> index *data, i
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> curr-filename <span class="Special">&lt;-</span> get tmp, <span class="Constant">name:offset</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> equal filename, curr-filename
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> found?
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> put-index *data, i, new-resource
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+unlock-and-exit</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L196" class="LineNr">196 </span>  <span class="Delimiter">}</span>
 <span id="L197" class="LineNr">197 </span>  <span class="Comment"># if file didn't already exist, make room for it</span>
 <span id="L198" class="LineNr">198 </span>  new-len:num <span class="Special">&lt;-</span> add len,<span class="Constant"> 1</span>
@@ -260,10 +261,10 @@ if ('onhashchange' in window) {
 <span id="L201" class="LineNr">201 </span>  <span class="Comment"># copy over old files</span>
 <span id="L202" class="LineNr">202 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L203" class="LineNr">203 </span>  <span class="Delimiter">{</span>
-<span id="L204" class="LineNr">204 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L205" class="LineNr">205 </span>    <span class="muControl">break-if</span> done?
-<span id="L206" class="LineNr">206 </span>    tmp:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> index *data, i
-<span id="L207" class="LineNr">207 </span>    put-index *new-data, i, tmp
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> tmp:<a href='088file.mu.html#L16'>resource</a> <span class="Special">&lt;-</span> index *data, i
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> put-index *new-data, i, tmp
 <span id="L208" class="LineNr">208 </span>  <span class="Delimiter">}</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Comment"># write new file</span>
 <span id="L210" class="LineNr">210 </span>  put-index *new-data, len, new-resource
diff --git a/html/089scenario_filesystem.cc.html b/html/089scenario_filesystem.cc.html
index e4128820..1bf75454 100644
--- a/html/089scenario_filesystem.cc.html
+++ b/html/089scenario_filesystem.cc.html
@@ -15,7 +15,7 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
+.Conceal { color: #4e4e4e; }
 .Special { color: #c00000; }
 .muScenario { color: #00af00; }
 .Comment { color: #9090ff; }
@@ -23,6 +23,7 @@ a:hover { text-decoration: underline; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.Constant { color: #00a0a0; }
 .cSpecial { color: #008000; }
 -->
 </style>
@@ -67,16 +68,16 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr">  7 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> simple-filesystem [
 <span id="L8" class="LineNr">  8 </span>  local-scope
 <span id="L9" class="LineNr">  9 </span>  assume-resources [
-<span id="L10" class="LineNr"> 10 </span>    <span class="Comment"># file 'a' containing two lines of data</span>
-<span id="L11" class="LineNr"> 11 </span>    [a]<span class="Special"> &lt;- </span>[
-<span id="L12" class="LineNr"> 12 </span>      |a bc|
-<span id="L13" class="LineNr"> 13 </span>      |de f|
-<span id="L14" class="LineNr"> 14 </span>    ]
-<span id="L15" class="LineNr"> 15 </span>    <span class="Comment"># directory 'b' containing two files, 'c' and 'd'</span>
-<span id="L16" class="LineNr"> 16 </span>    [b/c]<span class="Special"> &lt;- </span>[]
-<span id="L17" class="LineNr"> 17 </span>    [b/d]<span class="Special"> &lt;- </span>[
-<span id="L18" class="LineNr"> 18 </span>      |xyz|
-<span id="L19" class="LineNr"> 19 </span>    ]
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <span class="Comment"># file 'a' containing two lines of data</span>
+<span id="L11" class="LineNr"> 11 </span>  <span class="Conceal">¦</span> [a]<span class="Special"> &lt;- </span>[
+<span id="L12" class="LineNr"> 12 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> |a bc|
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> |de f|
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span> ]
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span> <span class="Comment"># directory 'b' containing two files, 'c' and 'd'</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> [b/c]<span class="Special"> &lt;- </span>[]
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> [b/d]<span class="Special"> &lt;- </span>[
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> |xyz|
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> ]
 <span id="L20" class="LineNr"> 20 </span>  ]
 <span id="L21" class="LineNr"> 21 </span>  <span class="Normal">data</span>:&amp;:@:resource<span class="Special"> &lt;- </span>get *resources<span class="Delimiter">,</span> <span class="Constant">data:offset</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Normal">file1</span>:resource<span class="Special"> &lt;- </span>index *data<span class="Delimiter">,</span> <span class="Constant">0</span>
@@ -95,14 +96,14 @@ if ('onhashchange' in window) {
 <span id="L35" class="LineNr"> 35 </span>  file3-contents:text<span class="Special"> &lt;- </span>get file3<span class="Delimiter">,</span> <span class="Constant">contents:offset</span>
 <span id="L36" class="LineNr"> 36 </span>  <span class="Constant">60</span>:@:<span class="Normal">char</span>/<span class="Special">raw &lt;- </span>copy *file3-contents
 <span id="L37" class="LineNr"> 37 </span>  memory-should-contain [
-<span id="L38" class="LineNr"> 38 </span>    <span class="Constant">10</span>:array:character<span class="Special"> &lt;- </span>[a]
-<span id="L39" class="LineNr"> 39 </span>    <span class="Constant">100</span>:array:character<span class="Special"> &lt;- </span>[a bc
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Constant">10</span>:array:character<span class="Special"> &lt;- </span>[a]
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <span class="Constant">100</span>:array:character<span class="Special"> &lt;- </span>[a bc
 <span id="L40" class="LineNr"> 40 </span>de f
 <span id="L41" class="LineNr"> 41 </span>]
-<span id="L42" class="LineNr"> 42 </span>    <span class="Constant">30</span>:array:character<span class="Special"> &lt;- </span>[b/c]
-<span id="L43" class="LineNr"> 43 </span>    <span class="Constant">40</span>:array:character<span class="Special"> &lt;- </span>[]
-<span id="L44" class="LineNr"> 44 </span>    <span class="Constant">50</span>:array:character<span class="Special"> &lt;- </span>[b/d]
-<span id="L45" class="LineNr"> 45 </span>    <span class="Constant">60</span>:array:character<span class="Special"> &lt;- </span>[xyz
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> <span class="Constant">30</span>:array:character<span class="Special"> &lt;- </span>[b/c]
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> <span class="Constant">40</span>:array:character<span class="Special"> &lt;- </span>[]
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <span class="Constant">50</span>:array:character<span class="Special"> &lt;- </span>[b/d]
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Constant">60</span>:array:character<span class="Special"> &lt;- </span>[xyz
 <span id="L46" class="LineNr"> 46 </span>]
 <span id="L47" class="LineNr"> 47 </span>  ]
 <span id="L48" class="LineNr"> 48 </span>]
@@ -111,11 +112,11 @@ if ('onhashchange' in window) {
 <span id="L51" class="LineNr"> 51 </span><span class="muScenario"><a href='050scenario.cc.html#L57'>scenario</a></span> escaping-file-contents [
 <span id="L52" class="LineNr"> 52 </span>  local-scope
 <span id="L53" class="LineNr"> 53 </span>  assume-resources [
-<span id="L54" class="LineNr"> 54 </span>    <span class="Comment"># file 'a' containing a '|'</span>
-<span id="L55" class="LineNr"> 55 </span>    <span class="Comment"># need to escape '\' once for each block</span>
-<span id="L56" class="LineNr"> 56 </span>    [a]<span class="Special"> &lt;- </span>[
-<span id="L57" class="LineNr"> 57 </span>      |x\\\\|yz|
-<span id="L58" class="LineNr"> 58 </span>    ]
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="Comment"># file 'a' containing a '|'</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> <span class="Comment"># need to escape '\' once for each block</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> [a]<span class="Special"> &lt;- </span>[
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> |x\\\\|yz|
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> ]
 <span id="L59" class="LineNr"> 59 </span>  ]
 <span id="L60" class="LineNr"> 60 </span>  <span class="Normal">data</span>:&amp;:@:resource<span class="Special"> &lt;- </span>get *resources<span class="Delimiter">,</span> <span class="Constant">data:offset</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Normal">file1</span>:resource<span class="Special"> &lt;- </span>index *data<span class="Delimiter">,</span> <span class="Constant">0</span>
@@ -124,8 +125,8 @@ if ('onhashchange' in window) {
 <span id="L64" class="LineNr"> 64 </span>  file1-contents:text<span class="Special"> &lt;- </span>get file1<span class="Delimiter">,</span> <span class="Constant">contents:offset</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Constant">20</span>:@:<span class="Normal">char</span>/<span class="Special">raw &lt;- </span>copy *file1-contents
 <span id="L66" class="LineNr"> 66 </span>  memory-should-contain [
-<span id="L67" class="LineNr"> 67 </span>    <span class="Constant">10</span>:array:character<span class="Special"> &lt;- </span>[a]
-<span id="L68" class="LineNr"> 68 </span>    <span class="Constant">20</span>:array:character<span class="Special"> &lt;- </span>[x|yz
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Constant">10</span>:array:character<span class="Special"> &lt;- </span>[a]
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Constant">20</span>:array:character<span class="Special"> &lt;- </span>[x|yz
 <span id="L69" class="LineNr"> 69 </span>]
 <span id="L70" class="LineNr"> 70 </span>  ]
 <span id="L71" class="LineNr"> 71 </span>]
@@ -171,60 +172,60 @@ if ('onhashchange' in window) {
 <span id="L111" class="LineNr">111 </span>  istringstream in<span class="Delimiter">(</span>data<span class="Delimiter">);</span>
 <span id="L112" class="LineNr">112 </span>  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
 <span id="L113" class="LineNr">113 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L115" class="LineNr">115 </span>    <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L116" class="LineNr">116 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L117" class="LineNr">117 </span>    string filename = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L118" class="LineNr">118 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>filename<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L120" class="LineNr">120 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'resources' block at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L121" class="LineNr">121 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L122" class="LineNr">122 </span>    <span class="Delimiter">}</span>
-<span id="L123" class="LineNr">123 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*filename<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L124" class="LineNr">124 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must begin with a '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L125" class="LineNr">125 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L126" class="LineNr">126 </span>    <span class="Delimiter">}</span>
-<span id="L127" class="LineNr">127 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*filename<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L128" class="LineNr">128 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must <a href='003trace.cc.html#L185'>end</a> with a ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L129" class="LineNr">129 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L130" class="LineNr">130 </span>    <span class="Delimiter">}</span>
-<span id="L131" class="LineNr">131 </span>    filename<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L132" class="LineNr">132 </span>    filename<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>filename<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L133" class="LineNr">133 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L134" class="LineNr">134 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: no data for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L135" class="LineNr">135 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L136" class="LineNr">136 </span>    <span class="Delimiter">}</span>
-<span id="L137" class="LineNr">137 </span>    string arrow = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L138" class="LineNr">138 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>arrow<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L139" class="LineNr">139 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L140" class="LineNr">140 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'resources' block at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L141" class="LineNr">141 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L142" class="LineNr">142 </span>    <span class="Delimiter">}</span>
-<span id="L143" class="LineNr">143 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>arrow != <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L144" class="LineNr">144 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: expected '&lt;-' after filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' but got '&quot;</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L145" class="LineNr">145 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L146" class="LineNr">146 </span>    <span class="Delimiter">}</span>
-<span id="L147" class="LineNr">147 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L148" class="LineNr">148 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: no data for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' after '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L149" class="LineNr">149 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L150" class="LineNr">150 </span>    <span class="Delimiter">}</span>
-<span id="L151" class="LineNr">151 </span>    string contents = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L152" class="LineNr">152 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>contents<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L153" class="LineNr">153 </span>      assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
-<span id="L154" class="LineNr">154 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'resources' block at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L155" class="LineNr">155 </span>      <span class="Identifier">return</span><span class="Delimiter">;</span>
-<span id="L156" class="LineNr">156 </span>    <span class="Delimiter">}</span>
-<span id="L157" class="LineNr">157 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*contents<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L158" class="LineNr">158 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents '&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;' for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must begin with a '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L159" class="LineNr">159 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L160" class="LineNr">160 </span>    <span class="Delimiter">}</span>
-<span id="L161" class="LineNr">161 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*contents<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L162" class="LineNr">162 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents '&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;' for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must <a href='003trace.cc.html#L185'>end</a> with a ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L163" class="LineNr">163 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L164" class="LineNr">164 </span>    <span class="Delimiter">}</span>
-<span id="L165" class="LineNr">165 </span>    contents<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L166" class="LineNr">166 </span>    contents<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L167" class="LineNr">167 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> filename<span class="Delimiter">,</span> <a href='089scenario_filesystem.cc.html#L171'>munge_resources_contents</a><span class="Delimiter">(</span>contents<span class="Delimiter">,</span> filename<span class="Delimiter">,</span> caller<span class="Delimiter">));</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> string filename = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>filename<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'resources' block at <a href='003trace.cc.html#L185'>end</a> of file (0)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*filename<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must begin with a '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*filename<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must <a href='003trace.cc.html#L185'>end</a> with a ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> filename<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> filename<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>filename<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: no data for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> string arrow = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>arrow<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'resources' block at <a href='003trace.cc.html#L185'>end</a> of file (1)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>arrow != <span class="Constant">&quot;&lt;-&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: expected '&lt;-' after filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' but got '&quot;</span> &lt;&lt; arrow &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: no data for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' after '&lt;-'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> string contents = <a href='011load.cc.html#L167'>next_word</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contents<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;incomplete 'resources' block at <a href='003trace.cc.html#L185'>end</a> of file (2)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*contents<span class="Delimiter">.</span>begin<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents '&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;' for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must begin with a '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*contents<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> != <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents '&quot;</span> &lt;&lt; contents &lt;&lt; <span class="Constant">&quot;' for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must <a href='003trace.cc.html#L185'>end</a> with a ']'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> contents<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> contents<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>out<span class="Delimiter">,</span> filename<span class="Delimiter">,</span> <a href='089scenario_filesystem.cc.html#L171'>munge_resources_contents</a><span class="Delimiter">(</span>contents<span class="Delimiter">,</span> filename<span class="Delimiter">,</span> caller<span class="Delimiter">));</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Delimiter">}</span>
 <span id="L169" class="LineNr">169 </span><span class="Delimiter">}</span>
 <span id="L170" class="LineNr">170 </span>
@@ -235,29 +236,29 @@ if ('onhashchange' in window) {
 <span id="L175" class="LineNr">175 </span>  <a href='011load.cc.html#L209'>skip_whitespace_and_comments</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
 <span id="L176" class="LineNr">176 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L178" class="LineNr">178 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L179" class="LineNr">179 </span>    <a href='038new_text.cc.html#L220'>skip_whitespace</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-<span id="L180" class="LineNr">180 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L181" class="LineNr">181 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'|'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L182" class="LineNr">182 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must be delimited in '|'s</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L183" class="LineNr">183 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L184" class="LineNr">184 </span>    <span class="Delimiter">}</span>
-<span id="L185" class="LineNr">185 </span>    in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip leading '|'</span>
-<span id="L186" class="LineNr">186 </span>    string line<span class="Delimiter">;</span>
-<span id="L187" class="LineNr">187 </span>    getline<span class="Delimiter">(</span>in<span class="Delimiter">,</span> line<span class="Delimiter">);</span>
-<span id="L188" class="LineNr">188 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>line<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L189" class="LineNr">189 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="Constant">'|'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L190" class="LineNr">190 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L191" class="LineNr">191 </span>        ++i<span class="Delimiter">;</span>  <span class="Comment">// skip</span>
-<span id="L192" class="LineNr">192 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>i == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>line<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L193" class="LineNr">193 </span>          <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents can't end a line with '</span><span class="cSpecial">\\</span><span class="Constant">'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span id="L194" class="LineNr">194 </span>          <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L195" class="LineNr">195 </span>        <span class="Delimiter">}</span>
-<span id="L196" class="LineNr">196 </span>      <span class="Delimiter">}</span>
-<span id="L197" class="LineNr">197 </span>      out &lt;&lt; line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L198" class="LineNr">198 </span>    <span class="Delimiter">}</span>
-<span id="L199" class="LineNr">199 </span>    <span class="Comment">// todo: some way to represent a file without a final newline</span>
-<span id="L200" class="LineNr">200 </span>    out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <a href='038new_text.cc.html#L220'>skip_whitespace</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'|'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents for filename '&quot;</span> &lt;&lt; filename &lt;&lt; <span class="Constant">&quot;' must be delimited in '|'s</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip leading '|'</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> string line<span class="Delimiter">;</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> getline<span class="Delimiter">(</span>in<span class="Delimiter">,</span> line<span class="Delimiter">);</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>line<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="Constant">'|'</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++i<span class="Delimiter">;</span>  <span class="Comment">// skip</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i == <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>line<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; caller &lt;&lt; <span class="Constant">&quot;: assume-resources: file contents can't end a line with '</span><span class="cSpecial">\\</span><span class="Constant">'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; line<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Comment">// todo: some way to represent a file without a final newline</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L201" class="LineNr">201 </span>  <span class="Delimiter">}</span>
 <span id="L202" class="LineNr">202 </span>  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L203" class="LineNr">203 </span><span class="Delimiter">}</span>
@@ -266,16 +267,16 @@ if ('onhashchange' in window) {
 <span id="L206" class="LineNr">206 </span>  <span class="Normal">int</span> resources_data_address = allocate<span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">)</span>*<span class="Constant">2</span> + <span class="Comment">/*</span><span class="Comment">array length</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L207" class="LineNr">207 </span>  <span class="Normal">int</span> curr = resources_data_address + <span class="Comment">/*</span><span class="Comment">skip refcount and length</span><span class="Comment">*/</span><span class="Constant">2</span><span class="Delimiter">;</span>
 <span id="L208" class="LineNr">208 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> string&gt;::const_iterator p = contents<span class="Delimiter">.</span>begin<span class="Delimiter">();</span>  p != contents<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>  ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L209" class="LineNr">209 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">));</span>
-<span id="L210" class="LineNr">210 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing file name &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; curr &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L211" class="LineNr">211 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">),</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L212" class="LineNr">212 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing refcount 1 in location &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L213" class="LineNr">213 </span>    ++curr<span class="Delimiter">;</span>
-<span id="L214" class="LineNr">214 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">));</span>
-<span id="L215" class="LineNr">215 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing file contents &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; curr &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L216" class="LineNr">216 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">),</span> <span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L217" class="LineNr">217 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing refcount 1 in location &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L218" class="LineNr">218 </span>    ++curr<span class="Delimiter">;</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>first<span class="Delimiter">));</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing file name &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; curr &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">),</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing refcount 1 in location &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> ++curr<span class="Delimiter">;</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <a href='038new_text.cc.html#L38'>new_mu_text</a><span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">));</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing file contents &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in location &quot;</span> &lt;&lt; curr &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">),</span> <span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;mem&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;storing refcount 1 in location &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">)</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> ++curr<span class="Delimiter">;</span>
 <span id="L219" class="LineNr">219 </span>  <span class="Delimiter">}</span>
 <span id="L220" class="LineNr">220 </span>  curr = resources_data_address+<span class="Comment">/*</span><span class="Comment">skip refcount</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr">221 </span>  <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Memory<span class="Delimiter">,</span> curr<span class="Delimiter">,</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>contents<span class="Delimiter">));</span>  <span class="Comment">// size of array</span>
diff --git a/html/090scenario_filesystem_test.mu.html b/html/090scenario_filesystem_test.mu.html
index 94ec62a7..e0a8ba7f 100644
--- a/html/090scenario_filesystem_test.mu.html
+++ b/html/090scenario_filesystem_test.mu.html
@@ -15,11 +15,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muScenario { color: #00af00; }
 -->
 </style>
 
@@ -59,9 +60,9 @@ if ('onhashchange' in window) {
 <span id="L3" class="LineNr"> 3 </span><span class="muScenario">scenario</span> read-from-fake-file [
 <span id="L4" class="LineNr"> 4 </span>  <span class="Constant">local-scope</span>
 <span id="L5" class="LineNr"> 5 </span>  assume-resources [
-<span id="L6" class="LineNr"> 6 </span>    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> [
-<span id="L7" class="LineNr"> 7 </span><span class="Constant">      |xyz|</span>
-<span id="L8" class="LineNr"> 8 </span>    ]
+<span id="L6" class="LineNr"> 6 </span>  <span class="Conceal">¦</span> <span class="Constant">[a]</span> <span class="Special">&lt;-</span> [
+<span id="L7" class="LineNr"> 7 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |xyz|</span>
+<span id="L8" class="LineNr"> 8 </span>  <span class="Conceal">¦</span> ]
 <span id="L9" class="LineNr"> 9 </span>  ]
 <span id="L10" class="LineNr">10 </span>  contents:&amp;:source:char <span class="Special">&lt;-</span> <a href='088file.mu.html#L21'>start-reading</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[a]</span>
 <span id="L11" class="LineNr">11 </span>  1:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
@@ -70,11 +71,11 @@ if ('onhashchange' in window) {
 <span id="L14" class="LineNr">14 </span>  4:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
 <span id="L15" class="LineNr">15 </span>  _, 5:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
 <span id="L16" class="LineNr">16 </span>  memory-should-contain [
-<span id="L17" class="LineNr">17 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 120</span>  <span class="Comment"># x</span>
-<span id="L18" class="LineNr">18 </span>   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 121</span>  <span class="Comment"># y</span>
-<span id="L19" class="LineNr">19 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 122</span>  <span class="Comment"># z</span>
-<span id="L20" class="LineNr">20 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 10</span>  <span class="Comment"># newline</span>
-<span id="L21" class="LineNr">21 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># eof</span>
+<span id="L17" class="LineNr">17 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 120</span>  <span class="Comment"># x</span>
+<span id="L18" class="LineNr">18 </span>  <span class="Conceal">¦</span><span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 121</span>  <span class="Comment"># y</span>
+<span id="L19" class="LineNr">19 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 122</span>  <span class="Comment"># z</span>
+<span id="L20" class="LineNr">20 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 10</span>  <span class="Comment"># newline</span>
+<span id="L21" class="LineNr">21 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># eof</span>
 <span id="L22" class="LineNr">22 </span>  ]
 <span id="L23" class="LineNr">23 </span>]
 <span id="L24" class="LineNr">24 </span>
@@ -90,16 +91,16 @@ if ('onhashchange' in window) {
 <span id="L34" class="LineNr">34 </span>  contents-read-back:text <span class="Special">&lt;-</span> <a href='088file.mu.html#L38'>slurp</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[a]</span>
 <span id="L35" class="LineNr">35 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal contents-read-back, <span class="Constant">[xy]</span>
 <span id="L36" class="LineNr">36 </span>  memory-should-contain [
-<span id="L37" class="LineNr">37 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
+<span id="L37" class="LineNr">37 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
 <span id="L38" class="LineNr">38 </span>  ]
 <span id="L39" class="LineNr">39 </span>]
 <span id="L40" class="LineNr">40 </span>
 <span id="L41" class="LineNr">41 </span><span class="muScenario">scenario</span> write-to-new-fake-file-2 [
 <span id="L42" class="LineNr">42 </span>  <span class="Constant">local-scope</span>
 <span id="L43" class="LineNr">43 </span>  assume-resources [
-<span id="L44" class="LineNr">44 </span>    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> [
-<span id="L45" class="LineNr">45 </span><span class="Constant">      |abc|</span>
-<span id="L46" class="LineNr">46 </span>    ]
+<span id="L44" class="LineNr">44 </span>  <span class="Conceal">¦</span> <span class="Constant">[a]</span> <span class="Special">&lt;-</span> [
+<span id="L45" class="LineNr">45 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Conceal">¦</span> ]
 <span id="L47" class="LineNr">47 </span>  ]
 <span id="L48" class="LineNr">48 </span>  sink:&amp;:sink:char, writer:num/routine <span class="Special">&lt;-</span> <a href='088file.mu.html#L105'>start-writing</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[b]</span>
 <span id="L49" class="LineNr">49 </span>  sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">120/x</span>
@@ -109,14 +110,14 @@ if ('onhashchange' in window) {
 <span id="L53" class="LineNr">53 </span>  contents-read-back:text <span class="Special">&lt;-</span> <a href='088file.mu.html#L38'>slurp</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[b]</span>
 <span id="L54" class="LineNr">54 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal contents-read-back, <span class="Constant">[xy]</span>
 <span id="L55" class="LineNr">55 </span>  memory-should-contain [
-<span id="L56" class="LineNr">56 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
+<span id="L56" class="LineNr">56 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
 <span id="L57" class="LineNr">57 </span>  ]
 <span id="L58" class="LineNr">58 </span>]
 <span id="L59" class="LineNr">59 </span>
 <span id="L60" class="LineNr">60 </span><span class="muScenario">scenario</span> write-to-fake-file-that-exists [
 <span id="L61" class="LineNr">61 </span>  <span class="Constant">local-scope</span>
 <span id="L62" class="LineNr">62 </span>  assume-resources [
-<span id="L63" class="LineNr">63 </span>    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> <span class="Constant">[]</span>
+<span id="L63" class="LineNr">63 </span>  <span class="Conceal">¦</span> <span class="Constant">[a]</span> <span class="Special">&lt;-</span> <span class="Constant">[]</span>
 <span id="L64" class="LineNr">64 </span>  ]
 <span id="L65" class="LineNr">65 </span>  sink:&amp;:sink:char, writer:num/routine <span class="Special">&lt;-</span> <a href='088file.mu.html#L105'>start-writing</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[a]</span>
 <span id="L66" class="LineNr">66 </span>  sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">120/x</span>
@@ -126,17 +127,17 @@ if ('onhashchange' in window) {
 <span id="L70" class="LineNr">70 </span>  contents-read-back:text <span class="Special">&lt;-</span> <a href='088file.mu.html#L38'>slurp</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[a]</span>
 <span id="L71" class="LineNr">71 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal contents-read-back, <span class="Constant">[xy]</span>
 <span id="L72" class="LineNr">72 </span>  memory-should-contain [
-<span id="L73" class="LineNr">73 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
+<span id="L73" class="LineNr">73 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
 <span id="L74" class="LineNr">74 </span>  ]
 <span id="L75" class="LineNr">75 </span>]
 <span id="L76" class="LineNr">76 </span>
 <span id="L77" class="LineNr">77 </span><span class="muScenario">scenario</span> write-to-existing-file-preserves-other-files [
 <span id="L78" class="LineNr">78 </span>  <span class="Constant">local-scope</span>
 <span id="L79" class="LineNr">79 </span>  assume-resources [
-<span id="L80" class="LineNr">80 </span>    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> <span class="Constant">[]</span>
-<span id="L81" class="LineNr">81 </span>    <span class="Constant">[b]</span> <span class="Special">&lt;-</span> [
-<span id="L82" class="LineNr">82 </span><span class="Constant">      |bcd|</span>
-<span id="L83" class="LineNr">83 </span>    ]
+<span id="L80" class="LineNr">80 </span>  <span class="Conceal">¦</span> <span class="Constant">[a]</span> <span class="Special">&lt;-</span> <span class="Constant">[]</span>
+<span id="L81" class="LineNr">81 </span>  <span class="Conceal">¦</span> <span class="Constant">[b]</span> <span class="Special">&lt;-</span> [
+<span id="L82" class="LineNr">82 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |bcd|</span>
+<span id="L83" class="LineNr">83 </span>  <span class="Conceal">¦</span> ]
 <span id="L84" class="LineNr">84 </span>  ]
 <span id="L85" class="LineNr">85 </span>  sink:&amp;:sink:char, writer:num/routine <span class="Special">&lt;-</span> <a href='088file.mu.html#L105'>start-writing</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[a]</span>
 <span id="L86" class="LineNr">86 </span>  sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">120/x</span>
@@ -149,8 +150,8 @@ if ('onhashchange' in window) {
 <span id="L93" class="LineNr">93 </span>  11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal other-file-contents, <span class="Constant">[bcd</span>
 <span id="L94" class="LineNr">94 </span><span class="Constant">]</span>
 <span id="L95" class="LineNr">95 </span>  memory-should-contain [
-<span id="L96" class="LineNr">96 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
-<span id="L97" class="LineNr">97 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># other files also continue to persist unchanged</span>
+<span id="L96" class="LineNr">96 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
+<span id="L97" class="LineNr">97 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># other files also continue to persist unchanged</span>
 <span id="L98" class="LineNr">98 </span>  ]
 <span id="L99" class="LineNr">99 </span>]
 </pre>
diff --git a/html/091socket.cc.html b/html/091socket.cc.html
index f503d40c..58e0c90a 100644
--- a/html/091socket.cc.html
+++ b/html/091socket.cc.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
+.Conceal { color: #4e4e4e; }
 .CommentedCode { color: #6c6c6c; }
-.cSpecial { color: #008000; }
+.Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .PreProc { color: #800080; }
-.Comment { color: #9090ff; }
+.Constant { color: #00a0a0; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -64,9 +65,9 @@ if ('onhashchange' in window) {
 <span id="L4" class="LineNr">  4 </span>  sockaddr_in addr<span class="Delimiter">;</span>
 <span id="L5" class="LineNr">  5 </span>  <span class="Normal">bool</span> polled<span class="Delimiter">;</span>
 <span id="L6" class="LineNr">  6 </span>  socket_t<span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L7" class="LineNr">  7 </span>    fd = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L8" class="LineNr">  8 </span>    polled = <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L9" class="LineNr">  9 </span>    bzero<span class="Delimiter">(</span>&amp;addr<span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
+<span id="L7" class="LineNr">  7 </span>  <span class="Conceal">¦</span> fd = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L8" class="LineNr">  8 </span>  <span class="Conceal">¦</span> polled = <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L9" class="LineNr">  9 </span>  <span class="Conceal">¦</span> bzero<span class="Delimiter">(</span>&amp;addr<span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>addr<span class="Delimiter">));</span>
 <span id="L10" class="LineNr"> 10 </span>  <span class="Delimiter">}</span>
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 <span id="L12" class="LineNr"> 12 </span>
@@ -77,24 +78,24 @@ if ('onhashchange' in window) {
 <span id="L17" class="LineNr"> 17 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L18" class="LineNr"> 18 </span><span class="Normal">case</span> _OPEN_CLIENT_SOCKET: <span class="Delimiter">{</span>
 <span id="L19" class="LineNr"> 19 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L20" class="LineNr"> 20 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-client-socket' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L21" class="LineNr"> 21 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-client-socket' requires exactly two ingredients, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Delimiter">}</span>
 <span id="L23" class="LineNr"> 23 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L24" class="LineNr"> 24 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-client-socket' should be text (the hostname), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L25" class="LineNr"> 25 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-client-socket' should be text (the hostname), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L26" class="LineNr"> 26 </span>  <span class="Delimiter">}</span>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L28" class="LineNr"> 28 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of '$open-client-socket' should be a number (the port of the hostname to connect to), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L29" class="LineNr"> 29 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of '$open-client-socket' should be a number (the port of the hostname to connect to), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L30" class="LineNr"> 30 </span>  <span class="Delimiter">}</span>
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-<span id="L32" class="LineNr"> 32 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-client-socket' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L33" class="LineNr"> 33 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-client-socket' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L34" class="LineNr"> 34 </span>  <span class="Delimiter">}</span>
 <span id="L35" class="LineNr"> 35 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L36" class="LineNr"> 36 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-client-socket' should be a number (socket handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L37" class="LineNr"> 37 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-client-socket' should be a number (socket handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L38" class="LineNr"> 38 </span>  <span class="Delimiter">}</span>
 <span id="L39" class="LineNr"> 39 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L40" class="LineNr"> 40 </span><span class="Delimiter">}</span>
@@ -105,9 +106,9 @@ if ('onhashchange' in window) {
 <span id="L45" class="LineNr"> 45 </span>  socket_t* client = <a href='091socket.cc.html#L57'>client_socket</a><span class="Delimiter">(</span>host<span class="Delimiter">,</span> port<span class="Delimiter">);</span>
 <span id="L46" class="LineNr"> 46 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>client<span class="Delimiter">-&gt;</span>fd &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// error</span>
-<span id="L48" class="LineNr"> 48 </span>    <span class="Normal">delete</span> client<span class="Delimiter">;</span>
-<span id="L49" class="LineNr"> 49 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L50" class="LineNr"> 50 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> client<span class="Delimiter">;</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L51" class="LineNr"> 51 </span>  <span class="Delimiter">}</span>
 <span id="L52" class="LineNr"> 52 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> result = <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>client<span class="Delimiter">);</span>
 <span id="L53" class="LineNr"> 53 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">double</span>&gt;<span class="Delimiter">(</span>result<span class="Delimiter">));</span>
@@ -118,17 +119,17 @@ if ('onhashchange' in window) {
 <span id="L58" class="LineNr"> 58 </span>  socket_t* result = <span class="Normal">new</span> socket_t<span class="Delimiter">;</span>
 <span id="L59" class="LineNr"> 59 </span>  result<span class="Delimiter">-&gt;</span>fd = socket<span class="Delimiter">(</span>AF_INET<span class="Delimiter">,</span> SOCK_STREAM<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L60" class="LineNr"> 60 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L61" class="LineNr"> 61 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to create socket.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L62" class="LineNr"> 62 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to create socket.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Delimiter">}</span>
 <span id="L64" class="LineNr"> 64 </span>  result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">.</span>sin_family = AF_INET<span class="Delimiter">;</span>
 <span id="L65" class="LineNr"> 65 </span>  hostent* tmp = gethostbyname<span class="Delimiter">(</span>host<span class="Delimiter">.</span>c_str<span class="Delimiter">());</span>
 <span id="L66" class="LineNr"> 66 </span>  bcopy<span class="Delimiter">(</span>tmp<span class="Delimiter">-&gt;</span>h_addr<span class="Delimiter">,</span> <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">char</span>*&gt;<span class="Delimiter">(</span>&amp;result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">.</span>sin_addr<span class="Delimiter">.</span>s_addr<span class="Delimiter">),</span> tmp<span class="Delimiter">-&gt;</span>h_length<span class="Delimiter">);</span>
 <span id="L67" class="LineNr"> 67 </span>  result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">.</span>sin_port = htons<span class="Delimiter">(</span>port<span class="Delimiter">);</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>connect<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">,</span> <span class="Normal">reinterpret_cast</span>&lt;sockaddr*&gt;<span class="Delimiter">(</span>&amp;result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">),</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">))</span> &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L69" class="LineNr"> 69 </span>    close<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">);</span>
-<span id="L70" class="LineNr"> 70 </span>    result<span class="Delimiter">-&gt;</span>fd = -<span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L71" class="LineNr"> 71 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to connect to &quot;</span> &lt;&lt; host &lt;&lt; <span class="Constant">':'</span> &lt;&lt; port &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> close<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">);</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">-&gt;</span>fd = -<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to connect to &quot;</span> &lt;&lt; host &lt;&lt; <span class="Constant">':'</span> &lt;&lt; port &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L72" class="LineNr"> 72 </span>  <span class="Delimiter">}</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L74" class="LineNr"> 74 </span><span class="Delimiter">}</span>
@@ -140,20 +141,20 @@ if ('onhashchange' in window) {
 <span id="L80" class="LineNr"> 80 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L81" class="LineNr"> 81 </span><span class="Normal">case</span> _OPEN_SERVER_SOCKET: <span class="Delimiter">{</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L83" class="LineNr"> 83 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-server-socket' requires exactly one ingredient (the port to listen for requests on), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L84" class="LineNr"> 84 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-server-socket' requires exactly one ingredient (the port to listen for requests on), but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L85" class="LineNr"> 85 </span>  <span class="Delimiter">}</span>
 <span id="L86" class="LineNr"> 86 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L87" class="LineNr"> 87 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-server-socket' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L88" class="LineNr"> 88 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$open-server-socket' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L89" class="LineNr"> 89 </span>  <span class="Delimiter">}</span>
 <span id="L90" class="LineNr"> 90 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L91" class="LineNr"> 91 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-server-socket' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L92" class="LineNr"> 92 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$open-server-socket' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L93" class="LineNr"> 93 </span>  <span class="Delimiter">}</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-server-socket' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L96" class="LineNr"> 96 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$open-server-socket' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L97" class="LineNr"> 97 </span>  <span class="Delimiter">}</span>
 <span id="L98" class="LineNr"> 98 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L99" class="LineNr"> 99 </span><span class="Delimiter">}</span>
@@ -163,9 +164,9 @@ if ('onhashchange' in window) {
 <span id="L103" class="LineNr">103 </span>  socket_t* server = <a href='091socket.cc.html#L115'>server_socket</a><span class="Delimiter">(</span>port<span class="Delimiter">);</span>
 <span id="L104" class="LineNr">104 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>server<span class="Delimiter">-&gt;</span>fd &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L106" class="LineNr">106 </span>    <span class="Normal">delete</span> server<span class="Delimiter">;</span>
-<span id="L107" class="LineNr">107 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L108" class="LineNr">108 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> server<span class="Delimiter">;</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L109" class="LineNr">109 </span>  <span class="Delimiter">}</span>
 <span id="L110" class="LineNr">110 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> result = <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>server<span class="Delimiter">);</span>
 <span id="L111" class="LineNr">111 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">double</span>&gt;<span class="Delimiter">(</span>result<span class="Delimiter">));</span>
@@ -176,8 +177,8 @@ if ('onhashchange' in window) {
 <span id="L116" class="LineNr">116 </span>  socket_t* result = <span class="Normal">new</span> socket_t<span class="Delimiter">;</span>
 <span id="L117" class="LineNr">117 </span>  result<span class="Delimiter">-&gt;</span>fd = socket<span class="Delimiter">(</span>AF_INET<span class="Delimiter">,</span> SOCK_STREAM<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to create server socket.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L120" class="LineNr">120 </span>    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to create server socket.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  <span class="Normal">int</span> dummy = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L123" class="LineNr">123 </span>  setsockopt<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">,</span> SOL_SOCKET<span class="Delimiter">,</span> SO_REUSEADDR<span class="Delimiter">,</span> &amp;dummy<span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>dummy<span class="Delimiter">));</span>
@@ -185,12 +186,12 @@ if ('onhashchange' in window) {
 <span id="L125" class="LineNr">125 </span>  result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">.</span>sin_addr<span class="Delimiter">.</span>s_addr = Current_scenario ? htonl<span class="Delimiter">(</span>INADDR_LOOPBACK<span class="Delimiter">)</span> : INADDR_ANY<span class="Delimiter">;</span>  <span class="Comment">// run tests without running afoul of any firewall</span>
 <span id="L126" class="LineNr">126 </span>  result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">.</span>sin_port = htons<span class="Delimiter">(</span>port<span class="Delimiter">);</span>
 <span id="L127" class="LineNr">127 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>bind<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">,</span> <span class="Normal">reinterpret_cast</span>&lt;sockaddr*&gt;<span class="Delimiter">(</span>&amp;result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">),</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>addr<span class="Delimiter">))</span> &gt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L128" class="LineNr">128 </span>    listen<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">queue length</span><span class="Comment">*/</span><span class="Constant">5</span><span class="Delimiter">);</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> listen<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">queue length</span><span class="Comment">*/</span><span class="Constant">5</span><span class="Delimiter">);</span>
 <span id="L129" class="LineNr">129 </span>  <span class="Delimiter">}</span>
 <span id="L130" class="LineNr">130 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L131" class="LineNr">131 </span>    close<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">);</span>
-<span id="L132" class="LineNr">132 </span>    result<span class="Delimiter">-&gt;</span>fd = -<span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L133" class="LineNr">133 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to bind result socket to port &quot;</span> &lt;&lt; port &lt;&lt; <span class="Constant">&quot;. Something's already using that port.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> close<span class="Delimiter">(</span>result<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">);</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> result<span class="Delimiter">-&gt;</span>fd = -<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;Failed to bind result socket to port &quot;</span> &lt;&lt; port &lt;&lt; <span class="Constant">&quot;. Something's already using that port.</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Delimiter">}</span>
 <span id="L135" class="LineNr">135 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
 <span id="L136" class="LineNr">136 </span><span class="Delimiter">}</span>
@@ -202,20 +203,20 @@ if ('onhashchange' in window) {
 <span id="L142" class="LineNr">142 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L143" class="LineNr">143 </span><span class="Normal">case</span> _ACCEPT: <span class="Delimiter">{</span>
 <span id="L144" class="LineNr">144 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L145" class="LineNr">145 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$accept' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L146" class="LineNr">146 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$accept' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L147" class="LineNr">147 </span>  <span class="Delimiter">}</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L149" class="LineNr">149 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$accept' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L150" class="LineNr">150 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$accept' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">}</span>
 <span id="L152" class="LineNr">152 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L153" class="LineNr">153 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$accept' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L154" class="LineNr">154 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$accept' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L155" class="LineNr">155 </span>  <span class="Delimiter">}</span>
 <span id="L156" class="LineNr">156 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L157" class="LineNr">157 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$accept' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L158" class="LineNr">158 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$accept' should be a number (file handle), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Delimiter">}</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L161" class="LineNr">161 </span><span class="Delimiter">}</span>
@@ -226,12 +227,12 @@ if ('onhashchange' in window) {
 <span id="L166" class="LineNr">166 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> x = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L167" class="LineNr">167 </span>  socket_t* server = <span class="Normal">reinterpret_cast</span>&lt;socket_t*&gt;<span class="Delimiter">(</span>x<span class="Delimiter">);</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>server<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L169" class="LineNr">169 </span>    socket_t* session = <a href='091socket.cc.html#L179'>accept_session</a><span class="Delimiter">(</span>server<span class="Delimiter">);</span>
-<span id="L170" class="LineNr">170 </span>    <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> result = <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>session<span class="Delimiter">);</span>
-<span id="L171" class="LineNr">171 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">double</span>&gt;<span class="Delimiter">(</span>result<span class="Delimiter">));</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> socket_t* session = <a href='091socket.cc.html#L179'>accept_session</a><span class="Delimiter">(</span>server<span class="Delimiter">);</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> result = <span class="Normal">reinterpret_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>session<span class="Delimiter">);</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Normal">static_cast</span>&lt;<span class="Normal">double</span>&gt;<span class="Delimiter">(</span>result<span class="Delimiter">));</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Delimiter">}</span>
 <span id="L173" class="LineNr">173 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L174" class="LineNr">174 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L175" class="LineNr">175 </span>  <span class="Delimiter">}</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L177" class="LineNr">177 </span><span class="Delimiter">}</span>
@@ -251,33 +252,33 @@ if ('onhashchange' in window) {
 <span id="L191" class="LineNr">191 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L192" class="LineNr">192 </span><span class="Normal">case</span> _READ_FROM_SOCKET: <span class="Delimiter">{</span>
 <span id="L193" class="LineNr">193 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L194" class="LineNr">194 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-socket' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L195" class="LineNr">195 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-socket' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L196" class="LineNr">196 </span>  <span class="Delimiter">}</span>
 <span id="L197" class="LineNr">197 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L198" class="LineNr">198 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$read-from-socket' should be a number (socket), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L199" class="LineNr">199 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$read-from-socket' should be a number (socket), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L200" class="LineNr">200 </span>  <span class="Delimiter">}</span>
 <span id="L201" class="LineNr">201 </span>  <span class="Normal">int</span> nprod = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span>
 <span id="L202" class="LineNr">202 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>nprod == <span class="Constant">0</span> || nprod &gt; <span class="Constant">4</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L203" class="LineNr">203 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-socket' requires 1-4 products, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L204" class="LineNr">204 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$read-from-socket' requires 1-4 products, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L205" class="LineNr">205 </span>  <span class="Delimiter">}</span>
 <span id="L206" class="LineNr">206 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_character<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L207" class="LineNr">207 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$read-from-socket' should be a character, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L208" class="LineNr">208 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first product of '$read-from-socket' should be a character, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Delimiter">}</span>
 <span id="L210" class="LineNr">210 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>nprod &gt; <span class="Constant">1</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L211" class="LineNr">211 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second product of '$read-from-socket' should be a boolean (data received?), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L212" class="LineNr">212 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second product of '$read-from-socket' should be a boolean (data received?), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L213" class="LineNr">213 </span>  <span class="Delimiter">}</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>nprod &gt; <span class="Constant">2</span> &amp;&amp; !is_mu_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L215" class="LineNr">215 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;third product of '$read-from-socket' should be a boolean (eof?), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L216" class="LineNr">216 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;third product of '$read-from-socket' should be a boolean (eof?), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L217" class="LineNr">217 </span>  <span class="Delimiter">}</span>
 <span id="L218" class="LineNr">218 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>nprod &gt; <span class="Constant">3</span> &amp;&amp; !is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L219" class="LineNr">219 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;fourth product of '$read-from-socket' should be a number (error code), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L220" class="LineNr">220 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;fourth product of '$read-from-socket' should be a number (error code), but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Delimiter">}</span>
 <span id="L222" class="LineNr">222 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L223" class="LineNr">223 </span><span class="Delimiter">}</span>
@@ -298,28 +299,28 @@ if ('onhashchange' in window) {
 <span id="L238" class="LineNr">238 </span>  <span class="Comment">// prematurely close the connection. See commit 3403. That seems to be gone</span>
 <span id="L239" class="LineNr">239 </span>  <span class="Comment">// after moving to recv()+poll(). It was never observed on OpenBSD.</span>
 <span id="L240" class="LineNr">240 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!socket<span class="Delimiter">-&gt;</span>polled<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L241" class="LineNr">241 </span>    pollfd p<span class="Delimiter">;</span>
-<span id="L242" class="LineNr">242 </span>    bzero<span class="Delimiter">(</span>&amp;p<span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>p<span class="Delimiter">));</span>
-<span id="L243" class="LineNr">243 </span>    p<span class="Delimiter">.</span>fd = socket<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">;</span>
-<span id="L244" class="LineNr">244 </span>    p<span class="Delimiter">.</span>events = POLLIN | POLLHUP<span class="Delimiter">;</span>
-<span id="L245" class="LineNr">245 </span>    <span class="Normal">int</span> poll_result = poll<span class="Delimiter">(</span>&amp;p<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">num pollfds</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">timeout</span><span class="Comment">*/</span><span class="Constant">100</span><span class="Comment">/*</span><span class="Comment">ms</span><span class="Comment">*/</span><span class="Delimiter">);</span>
-<span id="L246" class="LineNr">246 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>poll_result == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L247" class="LineNr">247 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">no data</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L248" class="LineNr">248 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
-<span id="L249" class="LineNr">249 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">eof</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
-<span id="L250" class="LineNr">250 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">error</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L251" class="LineNr">251 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L252" class="LineNr">252 </span>    <span class="Delimiter">}</span>
-<span id="L253" class="LineNr">253 </span>    <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>poll_result &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L254" class="LineNr">254 </span>      <span class="Normal">int</span> error_code = errno<span class="Delimiter">;</span>
-<span id="L255" class="LineNr">255 </span>      <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;error in $read-from-socket</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L256" class="LineNr">256 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">no data</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L257" class="LineNr">257 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
-<span id="L258" class="LineNr">258 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">eof</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
-<span id="L259" class="LineNr">259 </span>      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>error_code<span class="Delimiter">);</span>
-<span id="L260" class="LineNr">260 </span>      <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L261" class="LineNr">261 </span>    <span class="Delimiter">}</span>
-<span id="L262" class="LineNr">262 </span>    socket<span class="Delimiter">-&gt;</span>polled = <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> pollfd p<span class="Delimiter">;</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> bzero<span class="Delimiter">(</span>&amp;p<span class="Delimiter">,</span> <span class="Normal">sizeof</span><span class="Delimiter">(</span>p<span class="Delimiter">));</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> p<span class="Delimiter">.</span>fd = socket<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">;</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> p<span class="Delimiter">.</span>events = POLLIN | POLLHUP<span class="Delimiter">;</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> poll_result = poll<span class="Delimiter">(</span>&amp;p<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">num pollfds</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">timeout</span><span class="Comment">*/</span><span class="Constant">100</span><span class="Comment">/*</span><span class="Comment">ms</span><span class="Comment">*/</span><span class="Delimiter">);</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>poll_result == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">no data</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">eof</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">error</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>poll_result &lt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> error_code = errno<span class="Delimiter">;</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;error in $read-from-socket</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">no data</span><span class="Comment">*/</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">found</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">eof</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>error_code<span class="Delimiter">);</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> socket<span class="Delimiter">-&gt;</span>polled = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L263" class="LineNr">263 </span>  <span class="Delimiter">}</span>
 <span id="L264" class="LineNr">264 </span>  <span class="Normal">char</span> c = <span class="cSpecial">'\0'</span><span class="Delimiter">;</span>
 <span id="L265" class="LineNr">265 </span>  <span class="Normal">int</span> error_code = <span class="Constant">0</span><span class="Delimiter">;</span>
@@ -344,8 +345,8 @@ if ('onhashchange' in window) {
 <span id="L284" class="LineNr">284 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L285" class="LineNr">285 </span><span class="Normal">case</span> _WRITE_TO_SOCKET: <span class="Delimiter">{</span>
 <span id="L286" class="LineNr">286 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L287" class="LineNr">287 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$write-to-socket' requires exactly two ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L288" class="LineNr">288 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$write-to-socket' requires exactly two ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L289" class="LineNr">289 </span>  <span class="Delimiter">}</span>
 <span id="L290" class="LineNr">290 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L291" class="LineNr">291 </span><span class="Delimiter">}</span>
@@ -357,8 +358,8 @@ if ('onhashchange' in window) {
 <span id="L297" class="LineNr">297 </span>  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> y = <span class="Normal">static_cast</span>&lt;<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span>&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L298" class="LineNr">298 </span>  <span class="Normal">char</span> c = <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span>y<span class="Delimiter">);</span>
 <span id="L299" class="LineNr">299 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>write<span class="Delimiter">(</span>socket<span class="Delimiter">-&gt;</span>fd<span class="Delimiter">,</span> &amp;c<span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L300" class="LineNr">300 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;failed to write to socket</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L301" class="LineNr">301 </span>    exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>current_recipe_name<span class="Delimiter">())</span> &lt;&lt; <span class="Constant">&quot;failed to write to socket</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
 <span id="L302" class="LineNr">302 </span>  <span class="Delimiter">}</span>
 <span id="L303" class="LineNr">303 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L304" class="LineNr">304 </span>  products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
@@ -372,20 +373,20 @@ if ('onhashchange' in window) {
 <span id="L312" class="LineNr">312 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L313" class="LineNr">313 </span><span class="Normal">case</span> _CLOSE_SOCKET: <span class="Delimiter">{</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L315" class="LineNr">315 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-socket' requires exactly two ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L316" class="LineNr">316 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-socket' requires exactly two ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Delimiter">}</span>
 <span id="L318" class="LineNr">318 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_number<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L319" class="LineNr">319 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$close-socket' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L320" class="LineNr">320 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of '$close-socket' should be a number, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
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-<span id="L323" class="LineNr">323 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-socket' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L324" class="LineNr">324 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'$close-socket' requires exactly one product, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L325" class="LineNr">325 </span>  <span class="Delimiter">}</span>
 <span id="L326" class="LineNr">326 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name != inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L327" class="LineNr">327 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of '$close-socket' must be first ingredient '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L328" class="LineNr">328 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;product of '$close-socket' must be first ingredient '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;', but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L329" class="LineNr">329 </span>  <span class="Delimiter">}</span>
 <span id="L330" class="LineNr">330 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L331" class="LineNr">331 </span><span class="Delimiter">}</span>
diff --git a/html/092socket.mu.html b/html/092socket.mu.html
index 67ca0f17..04b81c38 100644
--- a/html/092socket.mu.html
+++ b/html/092socket.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -69,16 +70,16 @@ if ('onhashchange' in window) {
 <span id="L9" class="LineNr">  9 </span>  make-random-nondeterministic
 <span id="L10" class="LineNr"> 10 </span>  port:num <span class="Special">&lt;-</span> <a href='068random.mu.html#L57'>random-in-range</a> <span class="Constant">0/real-random-numbers</span>,<span class="Constant"> 8000</span>,<span class="Constant"> 8100</span>
 <span id="L11" class="LineNr"> 11 </span>  run [
-<span id="L12" class="LineNr"> 12 </span>    socket:num <span class="Special">&lt;-</span> $open-server-socket port
-<span id="L13" class="LineNr"> 13 </span>    assert socket, <span class="Constant">[ </span>
+<span id="L12" class="LineNr"> 12 </span>  <span class="Conceal">¦</span> socket:num <span class="Special">&lt;-</span> $open-server-socket port
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> assert socket, <span class="Constant">[ </span>
 <span id="L14" class="LineNr"> 14 </span><span class="Constant">F - example-server-test: $open-server-socket failed]</span>
-<span id="L15" class="LineNr"> 15 </span>    handler-routine:number <span class="Special">&lt;-</span> start-running <a href='092socket.mu.html#L55'>serve-one-request</a> socket, <a href='092socket.mu.html#L26'>example-handler</a>
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span> handler-routine:number <span class="Special">&lt;-</span> start-running <a href='092socket.mu.html#L55'>serve-one-request</a> socket, <a href='092socket.mu.html#L26'>example-handler</a>
 <span id="L16" class="LineNr"> 16 </span>  ]
 <span id="L17" class="LineNr"> 17 </span>  source:&amp;:source:char <span class="Special">&lt;-</span> <a href='092socket.mu.html#L69'>start-reading-from-network</a> <span class="Constant">0/real-resources</span>, <span class="Constant">[localhost/]</span>, port
 <span id="L18" class="LineNr"> 18 </span>  response:text <span class="Special">&lt;-</span> <a href='075channel.mu.html#L487'>drain</a> source
 <span id="L19" class="LineNr"> 19 </span>  10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *response
 <span id="L20" class="LineNr"> 20 </span>  memory-should-contain [
-<span id="L21" class="LineNr"> 21 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L22" class="LineNr"> 22 </span>  ]
 <span id="L23" class="LineNr"> 23 </span>  socket <span class="Special">&lt;-</span> $close-socket socket
 <span id="L24" class="LineNr"> 24 </span>]
@@ -95,17 +96,17 @@ if ('onhashchange' in window) {
 <span id="L35" class="LineNr"> 35 </span><span class="muScenario">scenario</span> example-client-test [
 <span id="L36" class="LineNr"> 36 </span>  <span class="Constant">local-scope</span>
 <span id="L37" class="LineNr"> 37 </span>  assume-resources [
-<span id="L38" class="LineNr"> 38 </span>    <span class="Constant">[example.com/]</span> <span class="Special">&lt;-</span> [
-<span id="L39" class="LineNr"> 39 </span><span class="Constant">      |abc|</span>
-<span id="L40" class="LineNr"> 40 </span>    ]
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="Constant">[example.com/]</span> <span class="Special">&lt;-</span> [
+<span id="L39" class="LineNr"> 39 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span> ]
 <span id="L41" class="LineNr"> 41 </span>  ]
 <span id="L42" class="LineNr"> 42 </span>  run [
-<span id="L43" class="LineNr"> 43 </span>    source:&amp;:source:char <span class="Special">&lt;-</span> <a href='092socket.mu.html#L69'>start-reading-from-network</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[example.com/]</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span> source:&amp;:source:char <span class="Special">&lt;-</span> <a href='092socket.mu.html#L69'>start-reading-from-network</a> <a href='088file.mu.html#L11'>resources</a>, <span class="Constant">[example.com/]</span>
 <span id="L44" class="LineNr"> 44 </span>  ]
 <span id="L45" class="LineNr"> 45 </span>  contents:text <span class="Special">&lt;-</span> <a href='075channel.mu.html#L487'>drain</a> source
 <span id="L46" class="LineNr"> 46 </span>  10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *contents
 <span id="L47" class="LineNr"> 47 </span>  memory-should-contain [
-<span id="L48" class="LineNr"> 48 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc</span>
 <span id="L49" class="LineNr"> 49 </span><span class="Constant">]</span>
 <span id="L50" class="LineNr"> 50 </span>  ]
 <span id="L51" class="LineNr"> 51 </span>]
@@ -130,15 +131,15 @@ if ('onhashchange' in window) {
 <span id="L70" class="LineNr"> 70 </span>  <span class="Constant">local-scope</span>
 <span id="L71" class="LineNr"> 71 </span>  <span class="Constant">load-ingredients</span>
 <span id="L72" class="LineNr"> 72 </span>  <span class="Delimiter">{</span>
-<span id="L73" class="LineNr"> 73 </span>    port:num, port-found?:boolean <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L74" class="LineNr"> 74 </span>    <span class="muControl">break-if</span> port-found?
-<span id="L75" class="LineNr"> 75 </span>    port <span class="Special">&lt;-</span> copy <span class="Constant">80/http-port</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> port:num, port-found?:boolean <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> port-found?
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> port <span class="Special">&lt;-</span> copy <span class="Constant">80/http-port</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Delimiter">}</span>
 <span id="L77" class="LineNr"> 77 </span>  <span class="Delimiter">{</span>
-<span id="L78" class="LineNr"> 78 </span>    <span class="muControl">break-unless</span> <a href='088file.mu.html#L11'>resources</a>
-<span id="L79" class="LineNr"> 79 </span>    <span class="Comment"># fake network</span>
-<span id="L80" class="LineNr"> 80 </span>    contents <span class="Special">&lt;-</span> <a href='088file.mu.html#L53'>start-reading-from-fake-resource</a> <a href='088file.mu.html#L11'>resources</a>, uri
-<span id="L81" class="LineNr"> 81 </span>    <span class="muControl">return</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='088file.mu.html#L11'>resources</a>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Comment"># fake network</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> contents <span class="Special">&lt;-</span> <a href='088file.mu.html#L53'>start-reading-from-fake-resource</a> <a href='088file.mu.html#L11'>resources</a>, uri
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Delimiter">}</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Comment"># real network</span>
 <span id="L84" class="LineNr"> 84 </span>  host:text, path:text <span class="Special">&lt;-</span> <a href='092socket.mu.html#L148'>split-at</a> uri, <span class="Constant">47/slash</span>
@@ -165,19 +166,19 @@ if ('onhashchange' in window) {
 <span id="L105" class="LineNr">105 </span>  <span class="Constant">local-scope</span>
 <span id="L106" class="LineNr">106 </span>  <span class="Constant">load-ingredients</span>
 <span id="L107" class="LineNr">107 </span>  <span class="Delimiter">{</span>
-<span id="L108" class="LineNr">108 </span><span class="Constant">    +next-attempt</span>
-<span id="L109" class="LineNr">109 </span>    c:char, found?:bool, eof?:bool, error:num <span class="Special">&lt;-</span> $read-from-socket socket
-<span id="L110" class="LineNr">110 </span>    <span class="muControl">break-if</span> eof?
-<span id="L111" class="LineNr">111 </span>    <span class="muControl">break-if</span> error
-<span id="L112" class="LineNr">112 </span>    <span class="Delimiter">{</span>
-<span id="L113" class="LineNr">113 </span>      <span class="muControl">break-unless</span> found?
-<span id="L114" class="LineNr">114 </span>      sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, c
-<span id="L115" class="LineNr">115 </span>    <span class="Delimiter">}</span>
-<span id="L116" class="LineNr">116 </span>    <span class="Delimiter">{</span>
-<span id="L117" class="LineNr">117 </span>      <span class="muControl">break-if</span> found?
-<span id="L118" class="LineNr">118 </span>      switch
-<span id="L119" class="LineNr">119 </span>    <span class="Delimiter">}</span>
-<span id="L120" class="LineNr">120 </span>    <span class="muControl">loop</span>
+<span id="L108" class="LineNr">108 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-attempt</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> c:char, found?:bool, eof?:bool, error:num <span class="Special">&lt;-</span> $read-from-socket socket
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> eof?
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> error
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> found?
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, c
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> switch
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L121" class="LineNr">121 </span>  <span class="Delimiter">}</span>
 <span id="L122" class="LineNr">122 </span>  sink <span class="Special">&lt;-</span> close sink
 <span id="L123" class="LineNr">123 </span>]
@@ -195,12 +196,12 @@ if ('onhashchange' in window) {
 <span id="L135" class="LineNr">135 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L136" class="LineNr">136 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Delimiter">{</span>
-<span id="L138" class="LineNr">138 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L139" class="LineNr">139 </span>    <span class="muControl">break-if</span> done?
-<span id="L140" class="LineNr">140 </span>    c:char <span class="Special">&lt;-</span> index *s, i
-<span id="L141" class="LineNr">141 </span>    $write-to-socket socket, c
-<span id="L142" class="LineNr">142 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L143" class="LineNr">143 </span>    <span class="muControl">loop</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *s, i
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> $write-to-socket socket, c
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L144" class="LineNr">144 </span>  <span class="Delimiter">}</span>
 <span id="L145" class="LineNr">145 </span>]
 <span id="L146" class="LineNr">146 </span>
@@ -211,11 +212,11 @@ if ('onhashchange' in window) {
 <span id="L151" class="LineNr">151 </span>  <span class="Comment"># empty text? return empty texts</span>
 <span id="L152" class="LineNr">152 </span>  len:num <span class="Special">&lt;-</span> length *text
 <span id="L153" class="LineNr">153 </span>  <span class="Delimiter">{</span>
-<span id="L154" class="LineNr">154 </span>    empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
-<span id="L155" class="LineNr">155 </span>    <span class="muControl">break-unless</span> empty?
-<span id="L156" class="LineNr">156 </span>    x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
-<span id="L157" class="LineNr">157 </span>    y:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
-<span id="L158" class="LineNr">158 </span>    <span class="muControl">return</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> empty?:bool <span class="Special">&lt;-</span> equal len,<span class="Constant"> 0</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> empty?
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> x:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> y:text <span class="Special">&lt;-</span> new <span class="Constant">[]</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Delimiter">}</span>
 <span id="L160" class="LineNr">160 </span>  idx:num <span class="Special">&lt;-</span> find-next text, delim,<span class="Constant"> 0</span>
 <span id="L161" class="LineNr">161 </span>  x:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L1279'>copy-range</a> text,<span class="Constant"> 0</span>, idx
@@ -226,13 +227,13 @@ if ('onhashchange' in window) {
 <span id="L166" class="LineNr">166 </span>  <span class="Constant">local-scope</span>
 <span id="L167" class="LineNr">167 </span>  x:text <span class="Special">&lt;-</span> new <span class="Constant">[a/b]</span>
 <span id="L168" class="LineNr">168 </span>  run [
-<span id="L169" class="LineNr">169 </span>    y:text, z:text <span class="Special">&lt;-</span> <a href='092socket.mu.html#L148'>split-at</a> x, <span class="Constant">47/slash</span>
-<span id="L170" class="LineNr">170 </span>    10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
-<span id="L171" class="LineNr">171 </span>    20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> y:text, z:text <span class="Special">&lt;-</span> <a href='092socket.mu.html#L148'>split-at</a> x, <span class="Constant">47/slash</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> 10:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *y
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> 20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *z
 <span id="L172" class="LineNr">172 </span>  ]
 <span id="L173" class="LineNr">173 </span>  memory-should-contain [
-<span id="L174" class="LineNr">174 </span>    10:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
-<span id="L175" class="LineNr">175 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[/b]</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> 10:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[/b]</span>
 <span id="L176" class="LineNr">176 </span>  ]
 <span id="L177" class="LineNr">177 </span>]
 </pre>
diff --git a/html/099hardware_checks.cc.html b/html/099hardware_checks.cc.html
new file mode 100644
index 00000000..494433e2
--- /dev/null
+++ b/html/099hardware_checks.cc.html
@@ -0,0 +1,129 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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+.LineNr { color: #444444; }
+.Identifier { color: #c0a020; }
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+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Let's raise errors when students use real hardware in any functions</span>
+<span id="L2" class="LineNr"> 2 </span><span class="Comment">//: besides 'main'. Part of the goal is to teach them testing hygiene and</span>
+<span id="L3" class="LineNr"> 3 </span><span class="Comment">//: dependency injection.</span>
+<span id="L4" class="LineNr"> 4 </span><span class="Comment">//:</span>
+<span id="L5" class="LineNr"> 5 </span><span class="Comment">//: This is easy to sidestep, it's for feedback rather than safety.</span>
+<span id="L6" class="LineNr"> 6 </span>
+<span id="L7" class="LineNr"> 7 </span><span class="Delimiter">:(before &quot;End Globals&quot;)</span>
+<span id="L8" class="LineNr"> 8 </span>vector&lt;type_tree*&gt; Real_hardware_types<span class="Delimiter">;</span>
+<span id="L9" class="LineNr"> 9 </span><span class="Delimiter">:(before &quot;Begin transform_all&quot;)</span>
+<span id="L10" class="LineNr">10 </span><a href='099hardware_checks.cc.html#L14'>setup_real_hardware_types</a><span class="Delimiter">();</span>
+<span id="L11" class="LineNr">11 </span><span class="Delimiter">:(before &quot;End transform_all&quot;)</span>
+<span id="L12" class="LineNr">12 </span><a href='099hardware_checks.cc.html#L25'>teardown_real_hardware_types</a><span class="Delimiter">();</span>
+<span id="L13" class="LineNr">13 </span><span class="Delimiter">:(code)</span>
+<span id="L14" class="LineNr">14 </span><span class="Normal">void</span> <a href='099hardware_checks.cc.html#L14'>setup_real_hardware_types</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L15" class="LineNr">15 </span>  Real_hardware_types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='099hardware_checks.cc.html#L19'>parse_type</a><span class="Delimiter">(</span><span class="Constant">&quot;address:screen&quot;</span><span class="Delimiter">));</span>
+<span id="L16" class="LineNr">16 </span>  Real_hardware_types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='099hardware_checks.cc.html#L19'>parse_type</a><span class="Delimiter">(</span><span class="Constant">&quot;address:console&quot;</span><span class="Delimiter">));</span>
+<span id="L17" class="LineNr">17 </span>  Real_hardware_types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='099hardware_checks.cc.html#L19'>parse_type</a><span class="Delimiter">(</span><span class="Constant">&quot;address:resources&quot;</span><span class="Delimiter">));</span>
+<span id="L18" class="LineNr">18 </span><span class="Delimiter">}</span>
+<span id="L19" class="LineNr">19 </span>type_tree* <a href='099hardware_checks.cc.html#L19'>parse_type</a><span class="Delimiter">(</span>string s<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L20" class="LineNr">20 </span>  reagent x<span class="Delimiter">(</span><span class="Constant">&quot;x:&quot;</span>+s<span class="Delimiter">);</span>
+<span id="L21" class="LineNr">21 </span>  type_tree* result = x<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
+<span id="L22" class="LineNr">22 </span>  x<span class="Delimiter">.</span>type = <span class="Constant">NULL</span><span class="Delimiter">;</span>  <span class="Comment">// don't deallocate on return</span>
+<span id="L23" class="LineNr">23 </span>  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
+<span id="L24" class="LineNr">24 </span><span class="Delimiter">}</span>
+<span id="L25" class="LineNr">25 </span><span class="Normal">void</span> <a href='099hardware_checks.cc.html#L25'>teardown_real_hardware_types</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L26" class="LineNr">26 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Real_hardware_types<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span>
+<span id="L27" class="LineNr">27 </span>  <span class="Conceal">¦</span> <span class="Normal">delete</span> Real_hardware_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L28" class="LineNr">28 </span>  Real_hardware_types<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
+<span id="L29" class="LineNr">29 </span><span class="Delimiter">}</span>
+<span id="L30" class="LineNr">30 </span>
+<span id="L31" class="LineNr">31 </span><span class="Delimiter">:(before &quot;End Checks&quot;)</span>
+<span id="L32" class="LineNr">32 </span>Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='099hardware_checks.cc.html#L34'>check_for_misuse_of_real_hardware</a><span class="Delimiter">);</span>
+<span id="L33" class="LineNr">33 </span><span class="Delimiter">:(code)</span>
+<span id="L34" class="LineNr">34 </span><span class="Normal">void</span> <a href='099hardware_checks.cc.html#L34'>check_for_misuse_of_real_hardware</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L35" class="LineNr">35 </span>  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
+<span id="L36" class="LineNr">36 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name == <span class="Constant">&quot;main&quot;</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L37" class="LineNr">37 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L74'>starts_with</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;scenario_&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span id="L38" class="LineNr">38 </span>  <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- check if <a href='010vm.cc.html#L19'>recipe</a> &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; has any dependency-injection mistakes&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L39" class="LineNr">39 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>  index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span>  ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L40" class="LineNr">40 </span>  <span class="Conceal">¦</span> <span class="Normal">const</span> instruction&amp; inst = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L41" class="LineNr">41 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>operation &lt; <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L42" class="LineNr">42 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span>  i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span>  ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L43" class="LineNr">43 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; ing = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L44" class="LineNr">44 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>ing<span class="Delimiter">)</span> || ing<span class="Delimiter">.</span>name != <span class="Constant">&quot;0&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L45" class="LineNr">45 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> recipe&amp; callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
+<span id="L46" class="LineNr">46 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!callee<span class="Delimiter">.</span>has_header<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L47" class="LineNr">47 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L48" class="LineNr">48 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; expected_ing = callee<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L49" class="LineNr">49 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span>  j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Real_hardware_types<span class="Delimiter">);</span>  ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L50" class="LineNr">50 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*Real_hardware_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> == *expected_ing<span class="Delimiter">.</span>type<span class="Delimiter">)</span>
+<span id="L51" class="LineNr">51 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;': only 'main' can pass 0 into a &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>expected_ing<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L52" class="LineNr">52 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L53" class="LineNr">53 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L54" class="LineNr">54 </span>  <span class="Delimiter">}</span>
+<span id="L55" class="LineNr">55 </span><span class="Delimiter">}</span>
+<span id="L56" class="LineNr">56 </span>
+<span id="L57" class="LineNr">57 </span><span class="Delimiter">:(scenarios transform)</span>
+<span id="L58" class="LineNr">58 </span><span class="Delimiter">:(scenario warn_on_using_real_screen_directly_in_non_main_recipe)</span>
+<span id="L59" class="LineNr">59 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L60" class="LineNr">60 </span><span class="muRecipe">def</span> foo [
+<span id="L61" class="LineNr">61 </span>  print <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">34</span>
+<span id="L62" class="LineNr">62 </span>]
+<span id="L63" class="LineNr">63 </span><span class="traceContains">+error: foo: 'print 0, 34': only 'main' can pass 0 into a (address screen)</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->
diff --git a/html/100trace_browser.cc.html b/html/100trace_browser.cc.html
index 9d621a9d..22b280a4 100644
--- a/html/100trace_browser.cc.html
+++ b/html/100trace_browser.cc.html
@@ -16,12 +16,13 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
 .Identifier { color: #c0a020; }
 .Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.cSpecial { color: #008000; }
 -->
 </style>
 
@@ -132,14 +133,14 @@ if ('onhashchange' in window) {
 <span id="L74" class="LineNr"> 74 </span>  cerr &lt;&lt; <span class="Constant">&quot;computing min depth to display</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L75" class="LineNr"> 75 </span>  <span class="Normal">int</span> min_depth = <span class="Constant">9999</span><span class="Delimiter">;</span>
 <span id="L76" class="LineNr"> 76 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L77" class="LineNr"> 77 </span>    trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L78" class="LineNr"> 78 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &lt; min_depth<span class="Delimiter">)</span> min_depth = curr_line<span class="Delimiter">.</span>depth<span class="Delimiter">;</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &lt; min_depth<span class="Delimiter">)</span> min_depth = curr_line<span class="Delimiter">.</span>depth<span class="Delimiter">;</span>
 <span id="L79" class="LineNr"> 79 </span>  <span class="Delimiter">}</span>
 <span id="L80" class="LineNr"> 80 </span>  cerr &lt;&lt; <span class="Constant">&quot;min depth is &quot;</span> &lt;&lt; min_depth &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L81" class="LineNr"> 81 </span>  cerr &lt;&lt; <span class="Constant">&quot;computing lines to display</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">;</span>
 <span id="L82" class="LineNr"> 82 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L83" class="LineNr"> 83 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>depth == min_depth<span class="Delimiter">)</span>
-<span id="L84" class="LineNr"> 84 </span>      Visible<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>depth == min_depth<span class="Delimiter">)</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Visible<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
 <span id="L85" class="LineNr"> 85 </span>  <span class="Delimiter">}</span>
 <span id="L86" class="LineNr"> 86 </span>  tb_init<span class="Delimiter">();</span>
 <span id="L87" class="LineNr"> 87 </span>  Display_row = Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
@@ -147,112 +148,112 @@ if ('onhashchange' in window) {
 <span id="L89" class="LineNr"> 89 </span>  Top_of_screen = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L90" class="LineNr"> 90 </span>  <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
 <span id="L91" class="LineNr"> 91 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><span class="Constant">true</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L92" class="LineNr"> 92 </span>    <a href='100trace_browser.cc.html#L218'>render</a><span class="Delimiter">();</span>
-<span id="L93" class="LineNr"> 93 </span>    <span class="Normal">do</span> <span class="Delimiter">{</span>
-<span id="L94" class="LineNr"> 94 </span>      tb_poll_event<span class="Delimiter">(</span>&amp;event<span class="Delimiter">);</span>
-<span id="L95" class="LineNr"> 95 </span>    <span class="Delimiter">}</span> <span class="Normal">while</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>type != TB_EVENT_KEY<span class="Delimiter">);</span>
-<span id="L96" class="LineNr"> 96 </span>    <span class="Normal">int</span> key = event<span class="Delimiter">.</span>key ? event<span class="Delimiter">.</span>key : event<span class="Delimiter">.</span>ch<span class="Delimiter">;</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'q'</span> || key == <span class="Constant">'Q'</span> || key == TB_KEY_CTRL_C<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L98" class="LineNr"> 98 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'j'</span> || key == TB_KEY_ARROW_DOWN<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L99" class="LineNr"> 99 </span>      <span class="Comment">// move cursor one line down</span>
-<span id="L100" class="LineNr">100 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; Last_printed_row<span class="Delimiter">)</span> ++Display_row<span class="Delimiter">;</span>
-<span id="L101" class="LineNr">101 </span>    <span class="Delimiter">}</span>
-<span id="L102" class="LineNr">102 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'k'</span> || key == TB_KEY_ARROW_UP<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L103" class="LineNr">103 </span>      <span class="Comment">// move cursor one line up</span>
-<span id="L104" class="LineNr">104 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &gt; <span class="Constant">0</span><span class="Delimiter">)</span> --Display_row<span class="Delimiter">;</span>
-<span id="L105" class="LineNr">105 </span>    <span class="Delimiter">}</span>
-<span id="L106" class="LineNr">106 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'H'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L107" class="LineNr">107 </span>      <span class="Comment">// move cursor to top of screen</span>
-<span id="L108" class="LineNr">108 </span>      Display_row = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L109" class="LineNr">109 </span>    <span class="Delimiter">}</span>
-<span id="L110" class="LineNr">110 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'M'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L111" class="LineNr">111 </span>      <span class="Comment">// move cursor to center of screen</span>
-<span id="L112" class="LineNr">112 </span>      Display_row = tb_height<span class="Delimiter">()</span>/<span class="Constant">2</span><span class="Delimiter">;</span>
-<span id="L113" class="LineNr">113 </span>    <span class="Delimiter">}</span>
-<span id="L114" class="LineNr">114 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'L'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L115" class="LineNr">115 </span>      <span class="Comment">// move cursor to bottom of screen</span>
-<span id="L116" class="LineNr">116 </span>      Display_row = tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L117" class="LineNr">117 </span>    <span class="Delimiter">}</span>
-<span id="L118" class="LineNr">118 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'J'</span> || key == TB_KEY_PGDN || key == TB_KEY_CTRL_F<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L119" class="LineNr">119 </span>      <span class="Comment">// page-down</span>
-<span id="L120" class="LineNr">120 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_index<span class="Delimiter">.</span>find<span class="Delimiter">(</span>tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> != Trace_index<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L121" class="LineNr">121 </span>        Top_of_screen = get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> + <span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L122" class="LineNr">122 </span>        <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L123" class="LineNr">123 </span>      <span class="Delimiter">}</span>
-<span id="L124" class="LineNr">124 </span>    <span class="Delimiter">}</span>
-<span id="L125" class="LineNr">125 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'K'</span> || key == TB_KEY_PGUP || key == TB_KEY_CTRL_B<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L126" class="LineNr">126 </span>      <span class="Comment">// page-up is more convoluted</span>
-<span id="L127" class="LineNr">127 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> screen_row = tb_height<span class="Delimiter">();</span> screen_row &gt; <span class="Constant">0</span> &amp;&amp; Top_of_screen &gt; <span class="Constant">0</span><span class="Delimiter">;</span> --screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L128" class="LineNr">128 </span>        --Top_of_screen<span class="Delimiter">;</span>
-<span id="L129" class="LineNr">129 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>Top_of_screen &lt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L130" class="LineNr">130 </span>        <span class="Normal">while</span> <span class="Delimiter">(</span>Top_of_screen &gt; <span class="Constant">0</span> &amp;&amp; !contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> Top_of_screen<span class="Delimiter">))</span>
-<span id="L131" class="LineNr">131 </span>          --Top_of_screen<span class="Delimiter">;</span>
-<span id="L132" class="LineNr">132 </span>      <span class="Delimiter">}</span>
-<span id="L133" class="LineNr">133 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>Top_of_screen &gt;= <span class="Constant">0</span><span class="Delimiter">)</span>
-<span id="L134" class="LineNr">134 </span>        <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L135" class="LineNr">135 </span>    <span class="Delimiter">}</span>
-<span id="L136" class="LineNr">136 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'g'</span> || key == TB_KEY_HOME<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L137" class="LineNr">137 </span>        Top_of_screen = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L138" class="LineNr">138 </span>        Last_printed_row = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L139" class="LineNr">139 </span>        Display_row = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L140" class="LineNr">140 </span>        <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L141" class="LineNr">141 </span>    <span class="Delimiter">}</span>
-<span id="L142" class="LineNr">142 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'G'</span> || key == TB_KEY_END<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L143" class="LineNr">143 </span>      <span class="Comment">// go to bottom of screen; largely like page-up, interestingly</span>
-<span id="L144" class="LineNr">144 </span>      Top_of_screen = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L145" class="LineNr">145 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> screen_row = tb_height<span class="Delimiter">();</span> screen_row &gt; <span class="Constant">0</span> &amp;&amp; Top_of_screen &gt; <span class="Constant">0</span><span class="Delimiter">;</span> --screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L146" class="LineNr">146 </span>        --Top_of_screen<span class="Delimiter">;</span>
-<span id="L147" class="LineNr">147 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>Top_of_screen &lt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L148" class="LineNr">148 </span>        <span class="Normal">while</span> <span class="Delimiter">(</span>Top_of_screen &gt; <span class="Constant">0</span> &amp;&amp; !contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> Top_of_screen<span class="Delimiter">))</span>
-<span id="L149" class="LineNr">149 </span>          --Top_of_screen<span class="Delimiter">;</span>
-<span id="L150" class="LineNr">150 </span>      <span class="Delimiter">}</span>
-<span id="L151" class="LineNr">151 </span>      <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L152" class="LineNr">152 </span>      <span class="Comment">// move cursor to bottom</span>
-<span id="L153" class="LineNr">153 </span>      Display_row = Last_printed_row<span class="Delimiter">;</span>
-<span id="L154" class="LineNr">154 </span>      <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L155" class="LineNr">155 </span>    <span class="Delimiter">}</span>
-<span id="L156" class="LineNr">156 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == TB_KEY_CARRIAGE_RETURN<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L157" class="LineNr">157 </span>      <span class="Comment">// expand lines under current by one level</span>
-<span id="L158" class="LineNr">158 </span>      assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">));</span>
-<span id="L159" class="LineNr">159 </span>      <span class="Normal">int</span> start_index = get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L160" class="LineNr">160 </span>      <span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L161" class="LineNr">161 </span>      <span class="Comment">// simultaneously compute end_index and min_depth</span>
-<span id="L162" class="LineNr">162 </span>      <span class="Normal">int</span> min_depth = <span class="Constant">9999</span><span class="Delimiter">;</span>
-<span id="L163" class="LineNr">163 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index+<span class="Constant">1</span><span class="Delimiter">;</span> index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> index<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L165" class="LineNr">165 </span>        trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L166" class="LineNr">166 </span>        assert<span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &gt; Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>start_index<span class="Delimiter">).</span>depth<span class="Delimiter">);</span>
-<span id="L167" class="LineNr">167 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &lt; min_depth<span class="Delimiter">)</span> min_depth = curr_line<span class="Delimiter">.</span>depth<span class="Delimiter">;</span>
-<span id="L168" class="LineNr">168 </span>      <span class="Delimiter">}</span>
-<span id="L169" class="LineNr">169 </span>      <span class="Normal">int</span> end_index = index<span class="Delimiter">;</span>
-<span id="L170" class="LineNr">170 </span>      <span class="Comment">// mark as visible all intervening indices at min_depth</span>
-<span id="L171" class="LineNr">171 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index<span class="Delimiter">;</span> index &lt; end_index<span class="Delimiter">;</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L172" class="LineNr">172 </span>        trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L173" class="LineNr">173 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth == min_depth<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L174" class="LineNr">174 </span>          Visible<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L175" class="LineNr">175 </span>        <span class="Delimiter">}</span>
-<span id="L176" class="LineNr">176 </span>      <span class="Delimiter">}</span>
-<span id="L177" class="LineNr">177 </span>      <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L178" class="LineNr">178 </span>    <span class="Delimiter">}</span>
-<span id="L179" class="LineNr">179 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>key == TB_KEY_BACKSPACE || key == TB_KEY_BACKSPACE2<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L180" class="LineNr">180 </span>      <span class="Comment">// collapse all lines under current</span>
-<span id="L181" class="LineNr">181 </span>      assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">));</span>
-<span id="L182" class="LineNr">182 </span>      <span class="Normal">int</span> start_index = get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L183" class="LineNr">183 </span>      <span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L184" class="LineNr">184 </span>      <span class="Comment">// end_index is the next line at a depth same as or lower than start_index</span>
-<span id="L185" class="LineNr">185 </span>      <span class="Normal">int</span> initial_depth = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>start_index<span class="Delimiter">).</span>depth<span class="Delimiter">;</span>
-<span id="L186" class="LineNr">186 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index+<span class="Constant">1</span><span class="Delimiter">;</span> index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L187" class="LineNr">187 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> index<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L188" class="LineNr">188 </span>        trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L189" class="LineNr">189 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &lt;= initial_depth<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L190" class="LineNr">190 </span>      <span class="Delimiter">}</span>
-<span id="L191" class="LineNr">191 </span>      <span class="Normal">int</span> end_index = index<span class="Delimiter">;</span>
-<span id="L192" class="LineNr">192 </span>      <span class="Comment">// mark as visible all intervening indices at min_depth</span>
-<span id="L193" class="LineNr">193 </span>      <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index+<span class="Constant">1</span><span class="Delimiter">;</span> index &lt; end_index<span class="Delimiter">;</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L194" class="LineNr">194 </span>        Visible<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
-<span id="L195" class="LineNr">195 </span>      <span class="Delimiter">}</span>
-<span id="L196" class="LineNr">196 </span>      <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
-<span id="L197" class="LineNr">197 </span>    <span class="Delimiter">}</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L218'>render</a><span class="Delimiter">();</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Normal">do</span> <span class="Delimiter">{</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_poll_event<span class="Delimiter">(</span>&amp;event<span class="Delimiter">);</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span> <span class="Normal">while</span> <span class="Delimiter">(</span>event<span class="Delimiter">.</span>type != TB_EVENT_KEY<span class="Delimiter">);</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> key = event<span class="Delimiter">.</span>key ? event<span class="Delimiter">.</span>key : event<span class="Delimiter">.</span>ch<span class="Delimiter">;</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'q'</span> || key == <span class="Constant">'Q'</span> || key == TB_KEY_CTRL_C<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'j'</span> || key == TB_KEY_ARROW_DOWN<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// move cursor one line down</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; Last_printed_row<span class="Delimiter">)</span> ++Display_row<span class="Delimiter">;</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'k'</span> || key == TB_KEY_ARROW_UP<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// move cursor one line up</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &gt; <span class="Constant">0</span><span class="Delimiter">)</span> --Display_row<span class="Delimiter">;</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'H'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// move cursor to top of screen</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_row = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'M'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// move cursor to center of screen</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_row = tb_height<span class="Delimiter">()</span>/<span class="Constant">2</span><span class="Delimiter">;</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'L'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// move cursor to bottom of screen</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_row = tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'J'</span> || key == TB_KEY_PGDN || key == TB_KEY_CTRL_F<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// page-down</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_index<span class="Delimiter">.</span>find<span class="Delimiter">(</span>tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> != Trace_index<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Top_of_screen = get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> + <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'K'</span> || key == TB_KEY_PGUP || key == TB_KEY_CTRL_B<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// page-up is more convoluted</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> screen_row = tb_height<span class="Delimiter">();</span> screen_row &gt; <span class="Constant">0</span> &amp;&amp; Top_of_screen &gt; <span class="Constant">0</span><span class="Delimiter">;</span> --screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Top_of_screen<span class="Delimiter">;</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Top_of_screen &lt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>Top_of_screen &gt; <span class="Constant">0</span> &amp;&amp; !contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> Top_of_screen<span class="Delimiter">))</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Top_of_screen<span class="Delimiter">;</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Top_of_screen &gt;= <span class="Constant">0</span><span class="Delimiter">)</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'g'</span> || key == TB_KEY_HOME<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Top_of_screen = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Last_printed_row = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_row = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">'G'</span> || key == TB_KEY_END<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// go to bottom of screen; largely like page-up, interestingly</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Top_of_screen = <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> screen_row = tb_height<span class="Delimiter">();</span> screen_row &gt; <span class="Constant">0</span> &amp;&amp; Top_of_screen &gt; <span class="Constant">0</span><span class="Delimiter">;</span> --screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Top_of_screen<span class="Delimiter">;</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Top_of_screen &lt;= <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>Top_of_screen &gt; <span class="Constant">0</span> &amp;&amp; !contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> Top_of_screen<span class="Delimiter">))</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Top_of_screen<span class="Delimiter">;</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// move cursor to bottom</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_row = Last_printed_row<span class="Delimiter">;</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == TB_KEY_CARRIAGE_RETURN<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// expand lines under current by one level</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">));</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> start_index = get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// simultaneously compute end_index and min_depth</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> min_depth = <span class="Constant">9999</span><span class="Delimiter">;</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index+<span class="Constant">1</span><span class="Delimiter">;</span> index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> index<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &gt; Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>start_index<span class="Delimiter">).</span>depth<span class="Delimiter">);</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &lt; min_depth<span class="Delimiter">)</span> min_depth = curr_line<span class="Delimiter">.</span>depth<span class="Delimiter">;</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> end_index = index<span class="Delimiter">;</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// mark as visible all intervening indices at min_depth</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index<span class="Delimiter">;</span> index &lt; end_index<span class="Delimiter">;</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth == min_depth<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Visible<span class="Delimiter">.</span>insert<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>key == TB_KEY_BACKSPACE || key == TB_KEY_BACKSPACE2<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// collapse all lines under current</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">));</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> start_index = get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// end_index is the next line at a depth same as or lower than start_index</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> initial_depth = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>start_index<span class="Delimiter">).</span>depth<span class="Delimiter">;</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index+<span class="Constant">1</span><span class="Delimiter">;</span> index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> index<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>curr_line<span class="Delimiter">.</span>depth &lt;= initial_depth<span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> end_index = index<span class="Delimiter">;</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// mark as visible all intervening indices at min_depth</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span>index = start_index+<span class="Constant">1</span><span class="Delimiter">;</span> index &lt; end_index<span class="Delimiter">;</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Visible<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L203'>refresh_screen_rows</a><span class="Delimiter">();</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L198" class="LineNr">198 </span>  <span class="Delimiter">}</span>
 <span id="L199" class="LineNr">199 </span>  tb_shutdown<span class="Delimiter">();</span>
 <span id="L200" class="LineNr">200 </span><span class="Delimiter">}</span>
@@ -262,13 +263,13 @@ if ('onhashchange' in window) {
 <span id="L204" class="LineNr">204 </span>  <span class="Normal">int</span> screen_row = <span class="Constant">0</span><span class="Delimiter">,</span> index = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L205" class="LineNr">205 </span>  Trace_index<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L206" class="LineNr">206 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>screen_row = <span class="Constant">0</span><span class="Delimiter">,</span> index = Top_of_screen<span class="Delimiter">;</span> screen_row &lt; tb_height<span class="Delimiter">()</span> &amp;&amp; index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">);</span> ++screen_row<span class="Delimiter">,</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L207" class="LineNr">207 </span>    <span class="Comment">// skip lines without depth for now</span>
-<span id="L208" class="LineNr">208 </span>    <span class="Normal">while</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> index<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L209" class="LineNr">209 </span>      ++index<span class="Delimiter">;</span>
-<span id="L210" class="LineNr">210 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">))</span> <span class="Identifier">goto</span> done<span class="Delimiter">;</span>
-<span id="L211" class="LineNr">211 </span>    <span class="Delimiter">}</span>
-<span id="L212" class="LineNr">212 </span>    assert<span class="Delimiter">(</span>index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">));</span>
-<span id="L213" class="LineNr">213 </span>    <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">,</span> index<span class="Delimiter">);</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Comment">// skip lines without depth for now</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Visible<span class="Delimiter">,</span> index<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++index<span class="Delimiter">;</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>index &gt;= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">))</span> <span class="Identifier">goto</span> done<span class="Delimiter">;</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>index &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">));</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">,</span> index<span class="Delimiter">);</span>
 <span id="L214" class="LineNr">214 </span>  <span class="Delimiter">}</span>
 <span id="L215" class="LineNr">215 </span><span class="Normal">done</span>:<span class="Delimiter">;</span>
 <span id="L216" class="LineNr">216 </span><span class="Delimiter">}</span>
@@ -276,23 +277,23 @@ if ('onhashchange' in window) {
 <span id="L218" class="LineNr">218 </span><span class="Normal">void</span> <a href='100trace_browser.cc.html#L218'>render</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
 <span id="L219" class="LineNr">219 </span>  <span class="Normal">int</span> screen_row = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L220" class="LineNr">220 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>screen_row = <span class="Constant">0</span><span class="Delimiter">;</span> screen_row &lt; tb_height<span class="Delimiter">();</span> ++screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L221" class="LineNr">221 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L222" class="LineNr">222 </span>    trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">));</span>
-<span id="L223" class="LineNr">223 </span>    ostringstream out<span class="Delimiter">;</span>
-<span id="L224" class="LineNr">224 </span>    out &lt;&lt; std::setw<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">)</span> &lt;&lt; curr_line<span class="Delimiter">.</span>depth &lt;&lt; <span class="Constant">' '</span> &lt;&lt; curr_line<span class="Delimiter">.</span>label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; curr_line<span class="Delimiter">.</span>contents<span class="Delimiter">;</span>
-<span id="L225" class="LineNr">225 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>screen_row &lt; tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L226" class="LineNr">226 </span>      <span class="Normal">int</span> delta = <a href='100trace_browser.cc.html#L244'>lines_hidden</a><span class="Delimiter">(</span>screen_row<span class="Delimiter">);</span>
-<span id="L227" class="LineNr">227 </span>      <span class="Comment">// home-brew escape sequence for red</span>
-<span id="L228" class="LineNr">228 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>delta &gt; <span class="Constant">999</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L229" class="LineNr">229 </span>      out &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; delta &lt;&lt; <span class="Constant">&quot;)&quot;</span><span class="Delimiter">;</span>
-<span id="L230" class="LineNr">230 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>delta &gt; <span class="Constant">999</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L231" class="LineNr">231 </span>    <span class="Delimiter">}</span>
-<span id="L232" class="LineNr">232 </span>    <a href='100trace_browser.cc.html#L252'>render_line</a><span class="Delimiter">(</span>screen_row<span class="Delimiter">,</span> out<span class="Delimiter">.</span>str<span class="Delimiter">(),</span> screen_row == Display_row<span class="Delimiter">);</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> trace_line&amp; curr_line = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>at<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">));</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> ostringstream out<span class="Delimiter">;</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> out &lt;&lt; std::setw<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">)</span> &lt;&lt; curr_line<span class="Delimiter">.</span>depth &lt;&lt; <span class="Constant">' '</span> &lt;&lt; curr_line<span class="Delimiter">.</span>label &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; curr_line<span class="Delimiter">.</span>contents<span class="Delimiter">;</span>
+<span id="L225" class="LineNr">225 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>screen_row &lt; tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> delta = <a href='100trace_browser.cc.html#L244'>lines_hidden</a><span class="Delimiter">(</span>screen_row<span class="Delimiter">);</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// home-brew escape sequence for red</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>delta &gt; <span class="Constant">999</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; delta &lt;&lt; <span class="Constant">&quot;)&quot;</span><span class="Delimiter">;</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>delta &gt; <span class="Constant">999</span><span class="Delimiter">)</span> out &lt;&lt; <span class="Normal">static_cast</span>&lt;<span class="Normal">char</span>&gt;<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L252'>render_line</a><span class="Delimiter">(</span>screen_row<span class="Delimiter">,</span> out<span class="Delimiter">.</span>str<span class="Delimiter">(),</span> screen_row == Display_row<span class="Delimiter">);</span>
 <span id="L233" class="LineNr">233 </span>  <span class="Delimiter">}</span>
 <span id="L234" class="LineNr">234 </span>  <span class="Comment">// clear rest of screen</span>
 <span id="L235" class="LineNr">235 </span>  Last_printed_row = screen_row-<span class="Constant">1</span><span class="Delimiter">;</span>
 <span id="L236" class="LineNr">236 </span>  <span class="Normal">for</span> <span class="Delimiter">(;</span> screen_row &lt; tb_height<span class="Delimiter">();</span> ++screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L237" class="LineNr">237 </span>    <a href='100trace_browser.cc.html#L252'>render_line</a><span class="Delimiter">(</span>screen_row<span class="Delimiter">,</span> <span class="Constant">&quot;~&quot;</span><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">highlight?</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <a href='100trace_browser.cc.html#L252'>render_line</a><span class="Delimiter">(</span>screen_row<span class="Delimiter">,</span> <span class="Constant">&quot;~&quot;</span><span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">highlight?</span><span class="Comment">*/</span><span class="Constant">false</span><span class="Delimiter">);</span>
 <span id="L238" class="LineNr">238 </span>  <span class="Delimiter">}</span>
 <span id="L239" class="LineNr">239 </span>  <span class="Comment">// move cursor back to display row at the end</span>
 <span id="L240" class="LineNr">240 </span>  tb_set_cursor<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
@@ -302,50 +303,50 @@ if ('onhashchange' in window) {
 <span id="L244" class="LineNr">244 </span><span class="Normal">int</span> <a href='100trace_browser.cc.html#L244'>lines_hidden</a><span class="Delimiter">(</span><span class="Normal">int</span> screen_row<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L245" class="LineNr">245 </span>  assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">));</span>
 <span id="L246" class="LineNr">246 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row+<span class="Constant">1</span><span class="Delimiter">))</span>
-<span id="L247" class="LineNr">247 </span>    <span class="Identifier">return</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">)</span> - get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">);</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">)</span> - get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">);</span>
 <span id="L248" class="LineNr">248 </span>  <span class="Normal">else</span>
-<span id="L249" class="LineNr">249 </span>    <span class="Identifier">return</span> get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row+<span class="Constant">1</span><span class="Delimiter">)</span> - get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">);</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row+<span class="Constant">1</span><span class="Delimiter">)</span> - get<span class="Delimiter">(</span>Trace_index<span class="Delimiter">,</span> screen_row<span class="Delimiter">);</span>
 <span id="L250" class="LineNr">250 </span><span class="Delimiter">}</span>
 <span id="L251" class="LineNr">251 </span>
 <span id="L252" class="LineNr">252 </span><span class="Normal">void</span> <a href='100trace_browser.cc.html#L252'>render_line</a><span class="Delimiter">(</span><span class="Normal">int</span> screen_row<span class="Delimiter">,</span> <span class="Normal">const</span> string&amp; s<span class="Delimiter">,</span> <span class="Normal">bool</span> highlight<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L253" class="LineNr">253 </span>  <span class="Normal">int</span> col = <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L254" class="LineNr">254 </span>  <span class="Normal">int</span> color = TB_WHITE<span class="Delimiter">;</span>
 <span id="L255" class="LineNr">255 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>col = <span class="Constant">0</span><span class="Delimiter">;</span> col &lt; tb_width<span class="Delimiter">()</span> &amp;&amp; col &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>s<span class="Delimiter">);</span> ++col<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L256" class="LineNr">256 </span>    <span class="Normal">char</span> c = s<span class="Delimiter">.</span>at<span class="Delimiter">(</span>col<span class="Delimiter">);</span>  <span class="Comment">// todo: unicode</span>
-<span id="L257" class="LineNr">257 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> c = <span class="Constant">';'</span><span class="Delimiter">;</span>  <span class="Comment">// replace newlines with semi-colons</span>
-<span id="L258" class="LineNr">258 </span>    <span class="Comment">// escapes. hack: can't start a line with them.</span>
-<span id="L259" class="LineNr">259 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\1'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> color = <span class="Comment">/*</span><span class="Comment">red</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> c = <span class="Constant">' '</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
-<span id="L260" class="LineNr">260 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\2'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> color = TB_WHITE<span class="Delimiter">;</span> c = <span class="Constant">' '</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
-<span id="L261" class="LineNr">261 </span>    tb_change_cell<span class="Delimiter">(</span>col<span class="Delimiter">,</span> screen_row<span class="Delimiter">,</span> c<span class="Delimiter">,</span> color<span class="Delimiter">,</span> highlight ? <span class="Comment">/*</span><span class="Comment">subtle grey</span><span class="Comment">*/</span><span class="Constant">240</span> : TB_BLACK<span class="Delimiter">);</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Normal">char</span> c = s<span class="Delimiter">.</span>at<span class="Delimiter">(</span>col<span class="Delimiter">);</span>  <span class="Comment">// todo: unicode</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> c = <span class="Constant">';'</span><span class="Delimiter">;</span>  <span class="Comment">// replace newlines with semi-colons</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Comment">// escapes. hack: can't start a line with them.</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\1'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> color = <span class="Comment">/*</span><span class="Comment">red</span><span class="Comment">*/</span><span class="Constant">1</span><span class="Delimiter">;</span> c = <span class="Constant">' '</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\2'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span> color = TB_WHITE<span class="Delimiter">;</span> c = <span class="Constant">' '</span><span class="Delimiter">;</span> <span class="Delimiter">}</span>
+<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> tb_change_cell<span class="Delimiter">(</span>col<span class="Delimiter">,</span> screen_row<span class="Delimiter">,</span> c<span class="Delimiter">,</span> color<span class="Delimiter">,</span> highlight ? <span class="Comment">/*</span><span class="Comment">subtle grey</span><span class="Comment">*/</span><span class="Constant">240</span> : TB_BLACK<span class="Delimiter">);</span>
 <span id="L262" class="LineNr">262 </span>  <span class="Delimiter">}</span>
 <span id="L263" class="LineNr">263 </span>  <span class="Normal">for</span> <span class="Delimiter">(;</span> col &lt; tb_width<span class="Delimiter">();</span> ++col<span class="Delimiter">)</span>
-<span id="L264" class="LineNr">264 </span>    tb_change_cell<span class="Delimiter">(</span>col<span class="Delimiter">,</span> screen_row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> TB_WHITE<span class="Delimiter">,</span> highlight ? <span class="Comment">/*</span><span class="Comment">subtle grey</span><span class="Comment">*/</span><span class="Constant">240</span> : TB_BLACK<span class="Delimiter">);</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> tb_change_cell<span class="Delimiter">(</span>col<span class="Delimiter">,</span> screen_row<span class="Delimiter">,</span> <span class="Constant">' '</span><span class="Delimiter">,</span> TB_WHITE<span class="Delimiter">,</span> highlight ? <span class="Comment">/*</span><span class="Comment">subtle grey</span><span class="Comment">*/</span><span class="Constant">240</span> : TB_BLACK<span class="Delimiter">);</span>
 <span id="L265" class="LineNr">265 </span><span class="Delimiter">}</span>
 <span id="L266" class="LineNr">266 </span>
 <span id="L267" class="LineNr">267 </span><span class="Normal">void</span> <a href='100trace_browser.cc.html#L267'>load_trace</a><span class="Delimiter">(</span><span class="Normal">const</span> <span class="Normal">char</span>* filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L268" class="LineNr">268 </span>  ifstream tin<span class="Delimiter">(</span>filename<span class="Delimiter">);</span>
 <span id="L269" class="LineNr">269 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!tin<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L270" class="LineNr">270 </span>    cerr &lt;&lt; <span class="Constant">&quot;no such file: &quot;</span> &lt;&lt; filename &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L271" class="LineNr">271 </span>    exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span> cerr &lt;&lt; <span class="Constant">&quot;no such file: &quot;</span> &lt;&lt; filename &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
 <span id="L272" class="LineNr">272 </span>  <span class="Delimiter">}</span>
 <span id="L273" class="LineNr">273 </span>  Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Normal">while</span> <span class="Delimiter">(</span><a href='001help.cc.html#L235'>has_data</a><span class="Delimiter">(</span>tin<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L275" class="LineNr">275 </span>    tin &gt;&gt; std::noskipws<span class="Delimiter">;</span>
-<span id="L276" class="LineNr">276 </span>      skip_whitespace_but_not_newline<span class="Delimiter">(</span>tin<span class="Delimiter">);</span>
-<span id="L277" class="LineNr">277 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span>!isdigit<span class="Delimiter">(</span>tin<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> <span class="Delimiter">{</span>
-<span id="L278" class="LineNr">278 </span>        string dummy<span class="Delimiter">;</span>
-<span id="L279" class="LineNr">279 </span>        getline<span class="Delimiter">(</span>tin<span class="Delimiter">,</span> dummy<span class="Delimiter">);</span>
-<span id="L280" class="LineNr">280 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L281" class="LineNr">281 </span>      <span class="Delimiter">}</span>
-<span id="L282" class="LineNr">282 </span>    tin &gt;&gt; std::skipws<span class="Delimiter">;</span>
-<span id="L283" class="LineNr">283 </span>    <span class="Normal">int</span> depth<span class="Delimiter">;</span>
-<span id="L284" class="LineNr">284 </span>    tin &gt;&gt; depth<span class="Delimiter">;</span>
-<span id="L285" class="LineNr">285 </span>    string label<span class="Delimiter">;</span>
-<span id="L286" class="LineNr">286 </span>    tin &gt;&gt; label<span class="Delimiter">;</span>
-<span id="L287" class="LineNr">287 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*--label<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span> label<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>--label<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
-<span id="L288" class="LineNr">288 </span>    string line<span class="Delimiter">;</span>
-<span id="L289" class="LineNr">289 </span>    getline<span class="Delimiter">(</span>tin<span class="Delimiter">,</span> line<span class="Delimiter">);</span>
-<span id="L290" class="LineNr">290 </span>    Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span>depth<span class="Delimiter">,</span> label<span class="Delimiter">,</span> line<span class="Delimiter">));</span>
+<span id="L275" class="LineNr">275 </span>  <span class="Conceal">¦</span> tin &gt;&gt; std::noskipws<span class="Delimiter">;</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> skip_whitespace_but_not_newline<span class="Delimiter">(</span>tin<span class="Delimiter">);</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!isdigit<span class="Delimiter">(</span>tin<span class="Delimiter">.</span>peek<span class="Delimiter">()))</span> <span class="Delimiter">{</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> string dummy<span class="Delimiter">;</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> getline<span class="Delimiter">(</span>tin<span class="Delimiter">,</span> dummy<span class="Delimiter">);</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> tin &gt;&gt; std::skipws<span class="Delimiter">;</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="Normal">int</span> depth<span class="Delimiter">;</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> tin &gt;&gt; depth<span class="Delimiter">;</span>
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span> string label<span class="Delimiter">;</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> tin &gt;&gt; label<span class="Delimiter">;</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*--label<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span> label<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>--label<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">());</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> string line<span class="Delimiter">;</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> getline<span class="Delimiter">(</span>tin<span class="Delimiter">,</span> line<span class="Delimiter">);</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>trace_line<span class="Delimiter">(</span>depth<span class="Delimiter">,</span> label<span class="Delimiter">,</span> line<span class="Delimiter">));</span>
 <span id="L291" class="LineNr">291 </span>  <span class="Delimiter">}</span>
 <span id="L292" class="LineNr">292 </span>  cerr &lt;&lt; <span class="Constant">&quot;lines read: &quot;</span> &lt;&lt; Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>size<span class="Delimiter">()</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L293" class="LineNr">293 </span><span class="Delimiter">}</span>
diff --git a/html/101run_sandboxed.cc.html b/html/101run_sandboxed.cc.html
index 9b3b875b..d5016d3f 100644
--- a/html/101run_sandboxed.cc.html
+++ b/html/101run_sandboxed.cc.html
@@ -16,16 +16,17 @@ a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
 .Constant { color: #00a0a0; }
-.Special { color: #c00000; }
-.CommentedCode { color: #6c6c6c; }
 .muRecipe { color: #ff8700; }
-.cSpecial { color: #008000; }
+.Conceal { color: #4e4e4e; }
+.Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.traceContains { color: #008000; }
-.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
 .Identifier { color: #c0a020; }
+.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
+.CommentedCode { color: #6c6c6c; }
+.cSpecial { color: #008000; }
+.traceContains { color: #008000; }
 -->
 </style>
 
@@ -103,12 +104,12 @@ if ('onhashchange' in window) {
 <span id="L41" class="LineNr"> 41 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L42" class="LineNr"> 42 </span><span class="Normal">case</span> RUN_SANDBOXED: <span class="Delimiter">{</span>
 <span id="L43" class="LineNr"> 43 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L44" class="LineNr"> 44 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'run-sandboxed' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L45" class="LineNr"> 45 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'run-sandboxed' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L46" class="LineNr"> 46 </span>  <span class="Delimiter">}</span>
 <span id="L47" class="LineNr"> 47 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L48" class="LineNr"> 48 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'run-sandboxed' should be a string, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L49" class="LineNr"> 49 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'run-sandboxed' should be a string, but got '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L50" class="LineNr"> 50 </span>  <span class="Delimiter">}</span>
 <span id="L51" class="LineNr"> 51 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L52" class="LineNr"> 52 </span><span class="Delimiter">}</span>
@@ -116,17 +117,17 @@ if ('onhashchange' in window) {
 <span id="L54" class="LineNr"> 54 </span><span class="Normal">case</span> RUN_SANDBOXED: <span class="Delimiter">{</span>
 <span id="L55" class="LineNr"> 55 </span>  <span class="Normal">bool</span> new_code_pushed_to_stack = <a href='101run_sandboxed.cc.html#L90'>run_interactive</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
 <span id="L56" class="LineNr"> 56 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!new_code_pushed_to_stack<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L57" class="LineNr"> 57 </span>    products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">5</span><span class="Delimiter">);</span>
-<span id="L58" class="LineNr"> 58 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L59" class="LineNr"> 59 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='101run_sandboxed.cc.html#L429'>trace_error_contents</a><span class="Delimiter">());</span>
-<span id="L60" class="LineNr"> 60 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L61" class="LineNr"> 61 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='101run_sandboxed.cc.html#L443'>trace_app_contents</a><span class="Delimiter">());</span>
-<span id="L62" class="LineNr"> 62 </span>    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// completed</span>
-<span id="L63" class="LineNr"> 63 </span>    <a href='101run_sandboxed.cc.html#L153'>run_code_end</a><span class="Delimiter">();</span>
-<span id="L64" class="LineNr"> 64 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// done with this instruction</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">5</span><span class="Delimiter">);</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='101run_sandboxed.cc.html#L429'>trace_error_contents</a><span class="Delimiter">());</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">3</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><a href='101run_sandboxed.cc.html#L443'>trace_app_contents</a><span class="Delimiter">());</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">4</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>  <span class="Comment">// completed</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <a href='101run_sandboxed.cc.html#L153'>run_code_end</a><span class="Delimiter">();</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// done with this instruction</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Delimiter">}</span>
 <span id="L66" class="LineNr"> 66 </span>  <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// not done with caller; don't increment current_step_index()</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// not done with caller; don't increment current_step_index()</span>
 <span id="L68" class="LineNr"> 68 </span>  <span class="Delimiter">}</span>
 <span id="L69" class="LineNr"> 69 </span><span class="Delimiter">}</span>
 <span id="L70" class="LineNr"> 70 </span>
@@ -154,8 +155,8 @@ if ('onhashchange' in window) {
 <span id="L92" class="LineNr"> 92 </span>  <span class="Comment">// try to sandbox the run as best you can</span>
 <span id="L93" class="LineNr"> 93 </span>  <span class="Comment">// todo: test this</span>
 <span id="L94" class="LineNr"> 94 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Current_scenario<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span> i &lt; Reserved_for_tests<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
-<span id="L96" class="LineNr"> 96 </span>      Memory<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">1</span><span class="Delimiter">;</span> i &lt; Reserved_for_tests<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Memory<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
 <span id="L97" class="LineNr"> 97 </span>  <span class="Delimiter">}</span>
 <span id="L98" class="LineNr"> 98 </span>  string command = <a href='003trace.cc.html#L355'>trim</a><span class="Delimiter">(</span><a href='101run_sandboxed.cc.html#L408'>strip_comments</a><span class="Delimiter">(</span><a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span><a href='043space.cc.html#L76'>address</a><span class="Delimiter">)));</span>
 <span id="L99" class="LineNr"> 99 </span>  Name[get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>]<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
@@ -166,22 +167,22 @@ if ('onhashchange' in window) {
 <span id="L104" class="LineNr">104 </span>  Current_routine = <span class="Constant">NULL</span><span class="Delimiter">;</span>
 <span id="L105" class="LineNr">105 </span>  <span class="Comment">// call run(string) but without the scheduling</span>
 <span id="L106" class="LineNr">106 </span>  load<span class="Delimiter">(</span>string<span class="Delimiter">(</span><span class="Constant">&quot;recipe! interactive [</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">)</span> +
-<span id="L107" class="LineNr">107 </span>          <span class="Constant">&quot;new-default-space</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +  <span class="Comment">// disable automatic abandon so tests can see changes</span>
-<span id="L108" class="LineNr">108 </span>          <span class="Constant">&quot;screen:&amp;:screen &lt;- next-ingredient</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
-<span id="L109" class="LineNr">109 </span>          <span class="Constant">&quot;$start-tracking-products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
-<span id="L110" class="LineNr">110 </span>          command + <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
-<span id="L111" class="LineNr">111 </span>          <span class="Constant">&quot;$stop-tracking-products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
-<span id="L112" class="LineNr">112 </span>          <span class="Constant">&quot;return screen</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
-<span id="L113" class="LineNr">113 </span>       <span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;new-default-space</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +  <span class="Comment">// disable automatic abandon so tests can see changes</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;screen:&amp;:screen &lt;- next-ingredient</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;$start-tracking-products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> command + <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;$stop-tracking-products</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">&quot;return screen</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> +
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span><span class="Constant">&quot;]</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">);</span>
 <span id="L114" class="LineNr">114 </span>  <a href='012transform.cc.html#L46'>transform_all</a><span class="Delimiter">();</span>
 <span id="L115" class="LineNr">115 </span>  Current_routine = save_current_routine<span class="Delimiter">;</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>trace_count<span class="Delimiter">(</span><span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span> &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Comment">// now call 'sandbox' which will run 'interactive' in a separate routine,</span>
 <span id="L118" class="LineNr">118 </span>  <span class="Comment">// and wait for it</span>
 <span id="L119" class="LineNr">119 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Save_trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L120" class="LineNr">120 </span>    ++Save_trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
-<span id="L121" class="LineNr">121 </span>    <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;run-sandboxed: incrementing callstack depth to &quot;</span> &lt;&lt; Save_trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L122" class="LineNr">122 </span>    assert<span class="Delimiter">(</span>Save_trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> ++Save_trace_stream<span class="Delimiter">-&gt;</span>callstack_depth<span class="Delimiter">;</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;trace&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;run-sandboxed: incrementing callstack depth to &quot;</span> &lt;&lt; Save_trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> assert<span class="Delimiter">(</span>Save_trace_stream<span class="Delimiter">-&gt;</span>callstack_depth &lt; <span class="Constant">9000</span><span class="Delimiter">);</span>  <span class="Comment">// 9998-101 plus cushion</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Delimiter">}</span>
 <span id="L124" class="LineNr">124 </span>  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;sandbox&quot;</span><span class="Delimiter">)));</span>
 <span id="L125" class="LineNr">125 </span>  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
@@ -206,7 +207,7 @@ if ('onhashchange' in window) {
 <span id="L144" class="LineNr">144 </span>  Hide_errors = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L145" class="LineNr">145 </span>  Disable_redefine_checks = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L146" class="LineNr">146 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>should_stash_snapshots<span class="Delimiter">)</span>
-<span id="L147" class="LineNr">147 </span>    <a href='101run_sandboxed.cc.html#L169'>stash_snapshots</a><span class="Delimiter">();</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <a href='101run_sandboxed.cc.html#L169'>stash_snapshots</a><span class="Delimiter">();</span>
 <span id="L148" class="LineNr">148 </span>  Save_trace_stream = Trace_stream<span class="Delimiter">;</span>
 <span id="L149" class="LineNr">149 </span>  Trace_stream = <span class="Normal">new</span> trace_stream<span class="Delimiter">;</span>
 <span id="L150" class="LineNr">150 </span>  Trace_stream<span class="Delimiter">-&gt;</span>collect_depth = App_depth<span class="Delimiter">;</span>
@@ -224,7 +225,7 @@ if ('onhashchange' in window) {
 <span id="L162" class="LineNr">162 </span>  Save_trace_file<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
 <span id="L163" class="LineNr">163 </span>  Recipe<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">));</span>  <span class="Comment">// keep past sandboxes from inserting errors</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Recipe_snapshot_stash<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
-<span id="L165" class="LineNr">165 </span>    <a href='101run_sandboxed.cc.html#L190'>unstash_snapshots</a><span class="Delimiter">();</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <a href='101run_sandboxed.cc.html#L190'>unstash_snapshots</a><span class="Delimiter">();</span>
 <span id="L166" class="LineNr">166 </span><span class="Delimiter">}</span>
 <span id="L167" class="LineNr">167 </span>
 <span id="L168" class="LineNr">168 </span><span class="Comment">// keep sync'd with save_snapshots and restore_snapshots</span>
@@ -397,9 +398,9 @@ if ('onhashchange' in window) {
 <span id="L335" class="LineNr">335 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L336" class="LineNr">336 </span>  <span class="Comment"># try to interactively add 2 and 2</span>
 <span id="L337" class="LineNr">337 </span>  <span class="Constant">1</span>:text<span class="Special"> &lt;- </span><span class="Normal">new</span> [
-<span id="L338" class="LineNr">338 </span>    <span class="Normal">x</span>:text<span class="Special"> &lt;- </span><span class="Normal">new</span> [a]
-<span id="L339" class="LineNr">339 </span>    <span class="Normal">y</span>:text<span class="Special"> &lt;- </span><span class="Normal">new</span> [b]
-<span id="L340" class="LineNr">340 </span>    <span class="Normal">z</span>:text<span class="Special"> &lt;- </span>append x:text<span class="Delimiter">,</span> y:text
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> <span class="Normal">x</span>:text<span class="Special"> &lt;- </span><span class="Normal">new</span> [a]
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> <span class="Normal">y</span>:text<span class="Special"> &lt;- </span><span class="Normal">new</span> [b]
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <span class="Normal">z</span>:text<span class="Special"> &lt;- </span>append x:text<span class="Delimiter">,</span> y:text
 <span id="L341" class="LineNr">341 </span>  ]
 <span id="L342" class="LineNr">342 </span>  <span class="Constant">2</span>:text<span class="Special"> &lt;- </span>run-sandboxed <span class="Constant">1</span>:text
 <span id="L343" class="LineNr">343 </span>  <span class="Constant">10</span>:@:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">2</span>:text/lookup
@@ -442,26 +443,26 @@ if ('onhashchange' in window) {
 <span id="L380" class="LineNr">380 </span><span class="Normal">void</span> <a href='101run_sandboxed.cc.html#L380'>track_most_recent_products</a><span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; <a href='010vm.cc.html#L32'>instruction</a><span class="Delimiter">,</span> <span class="Normal">const</span> vector&lt;vector&lt;<span class="Normal">double</span>&gt; &gt;&amp; products<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L381" class="LineNr">381 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L382" class="LineNr">382 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L383" class="LineNr">383 </span>    <span class="Comment">// A sandbox can print a string result, but only if it is actually saved</span>
-<span id="L384" class="LineNr">384 </span>    <span class="Comment">// to a variable in the sandbox, because otherwise the results are</span>
-<span id="L385" class="LineNr">385 </span>    <span class="Comment">// reclaimed before the sandbox sees them. So you get these interactions</span>
-<span id="L386" class="LineNr">386 </span>    <span class="Comment">// in the sandbox:</span>
-<span id="L387" class="LineNr">387 </span>    <span class="Comment">//</span>
-<span id="L388" class="LineNr">388 </span>    <span class="Comment">//    new [abc]</span>
-<span id="L389" class="LineNr">389 </span>    <span class="Comment">//    =&gt; &lt;address&gt;</span>
-<span id="L390" class="LineNr">390 </span>    <span class="Comment">//</span>
-<span id="L391" class="LineNr">391 </span>    <span class="Comment">//    x:text &lt;- new [abc]</span>
-<span id="L392" class="LineNr">392 </span>    <span class="Comment">//    =&gt; abc</span>
-<span id="L393" class="LineNr">393 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span><a href='010vm.cc.html#L32'>instruction</a><span class="Delimiter">.</span>products<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L394" class="LineNr">394 </span>      <span class="Normal">if</span> <span class="Delimiter">(</span><a href='027call_ingredient.cc.html#L174'>is_mu_text</a><span class="Delimiter">(</span><a href='010vm.cc.html#L32'>instruction</a><span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L395" class="LineNr">395 </span>        <span class="Normal">if</span> <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
-<span id="L396" class="LineNr">396 </span>        out &lt;&lt; <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L397" class="LineNr">397 </span>        <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L398" class="LineNr">398 </span>      <span class="Delimiter">}</span>
-<span id="L399" class="LineNr">399 </span>    <span class="Delimiter">}</span>
-<span id="L400" class="LineNr">400 </span>    <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> ++j<span class="Delimiter">)</span>
-<span id="L401" class="LineNr">401 </span>      out &lt;&lt; no_scientific<span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
-<span id="L402" class="LineNr">402 </span>    out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span> <span class="Comment">// A sandbox can print a string result, but only if it is actually saved</span>
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span> <span class="Comment">// to a variable in the sandbox, because otherwise the results are</span>
+<span id="L385" class="LineNr">385 </span>  <span class="Conceal">¦</span> <span class="Comment">// reclaimed before the sandbox sees them. So you get these interactions</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> <span class="Comment">// in the sandbox:</span>
+<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span> <span class="Comment">//</span>
+<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span> <span class="Comment">//    new [abc]</span>
+<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span> <span class="Comment">//    =&gt; &lt;address&gt;</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span> <span class="Comment">//</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> <span class="Comment">//    x:text &lt;- new [abc]</span>
+<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span> <span class="Comment">//    =&gt; abc</span>
+<span id="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span><a href='010vm.cc.html#L32'>instruction</a><span class="Delimiter">.</span>products<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='027call_ingredient.cc.html#L174'>is_mu_text</a><span class="Delimiter">(</span><a href='010vm.cc.html#L32'>instruction</a><span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!scalar<span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>  <span class="Comment">// error handled elsewhere</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; <a href='038new_text.cc.html#L143'>read_mu_text</a><span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> j = <span class="Constant">0</span><span class="Delimiter">;</span> j &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> ++j<span class="Delimiter">)</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> out &lt;&lt; no_scientific<span class="Delimiter">(</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> &lt;&lt; <span class="Constant">' '</span><span class="Delimiter">;</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L403" class="LineNr">403 </span>  <span class="Delimiter">}</span>
 <span id="L404" class="LineNr">404 </span>  Most_recent_products = out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L405" class="LineNr">405 </span><span class="Delimiter">}</span>
@@ -470,13 +471,13 @@ if ('onhashchange' in window) {
 <span id="L408" class="LineNr">408 </span>string <a href='101run_sandboxed.cc.html#L408'>strip_comments</a><span class="Delimiter">(</span>string in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L409" class="LineNr">409 </span>  ostringstream result<span class="Delimiter">;</span>
 <span id="L410" class="LineNr">410 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L411" class="LineNr">411 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> != <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L412" class="LineNr">412 </span>      result &lt;&lt; in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-<span id="L413" class="LineNr">413 </span>    <span class="Delimiter">}</span>
-<span id="L414" class="LineNr">414 </span>    <span class="Normal">else</span> <span class="Delimiter">{</span>
-<span id="L415" class="LineNr">415 </span>      <span class="Normal">while</span> <span class="Delimiter">(</span>i+<span class="Constant">1</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i+<span class="Constant">1</span><span class="Delimiter">)</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span>
-<span id="L416" class="LineNr">416 </span>        ++i<span class="Delimiter">;</span>
-<span id="L417" class="LineNr">417 </span>    <span class="Delimiter">}</span>
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> != <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result &lt;&lt; in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L414" class="LineNr">414 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>i+<span class="Constant">1</span> &lt; <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> &amp;&amp; in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i+<span class="Constant">1</span><span class="Delimiter">)</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++i<span class="Delimiter">;</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L418" class="LineNr">418 </span>  <span class="Delimiter">}</span>
 <span id="L419" class="LineNr">419 </span>  <span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L420" class="LineNr">420 </span><span class="Delimiter">}</span>
@@ -492,9 +493,9 @@ if ('onhashchange' in window) {
 <span id="L430" class="LineNr">430 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Trace_stream<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L431" class="LineNr">431 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L432" class="LineNr">432 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L433" class="LineNr">433 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>label != <span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L434" class="LineNr">434 </span>    out &lt;&lt; p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">;</span>
-<span id="L435" class="LineNr">435 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*--p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>label != <span class="Constant">&quot;error&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> out &lt;&lt; p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">;</span>
+<span id="L435" class="LineNr">435 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*--p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L436" class="LineNr">436 </span>  <span class="Delimiter">}</span>
 <span id="L437" class="LineNr">437 </span>  string result = out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L438" class="LineNr">438 </span>  <a href='101run_sandboxed.cc.html#L457'>truncate</a><span class="Delimiter">(</span>result<span class="Delimiter">);</span>
@@ -506,9 +507,9 @@ if ('onhashchange' in window) {
 <span id="L444" class="LineNr">444 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!Trace_stream<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
 <span id="L445" class="LineNr">445 </span>  ostringstream out<span class="Delimiter">;</span>
 <span id="L446" class="LineNr">446 </span>  <span class="Normal">for</span> <span class="Delimiter">(</span>vector&lt;trace_line&gt;::iterator p = Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Trace_stream<span class="Delimiter">-&gt;</span>past_lines<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L447" class="LineNr">447 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>depth != App_depth<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-<span id="L448" class="LineNr">448 </span>    out &lt;&lt; p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">;</span>
-<span id="L449" class="LineNr">449 </span>    <span class="Normal">if</span> <span class="Delimiter">(</span>*--p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>depth != App_depth<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> out &lt;&lt; p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">;</span>
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>*--p<span class="Delimiter">-&gt;</span>contents<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
 <span id="L450" class="LineNr">450 </span>  <span class="Delimiter">}</span>
 <span id="L451" class="LineNr">451 </span>  string result = out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
 <span id="L452" class="LineNr">452 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
@@ -518,10 +519,10 @@ if ('onhashchange' in window) {
 <span id="L456" class="LineNr">456 </span>
 <span id="L457" class="LineNr">457 </span><span class="Normal">void</span> <a href='101run_sandboxed.cc.html#L457'>truncate</a><span class="Delimiter">(</span>string&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L458" class="LineNr">458 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>x<span class="Delimiter">)</span> &gt; <span class="Constant">1024</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L459" class="LineNr">459 </span>    x<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">1024</span><span class="Delimiter">);</span>
-<span id="L460" class="LineNr">460 </span>    *x<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> = <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
-<span id="L461" class="LineNr">461 </span>    *++x<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> = <span class="Constant">'.'</span><span class="Delimiter">;</span>
-<span id="L462" class="LineNr">462 </span>    *++++x<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> = <span class="Constant">'.'</span><span class="Delimiter">;</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> x<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">1024</span><span class="Delimiter">);</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> *x<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> = <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> *++x<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> = <span class="Constant">'.'</span><span class="Delimiter">;</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span> *++++x<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> = <span class="Constant">'.'</span><span class="Delimiter">;</span>
 <span id="L463" class="LineNr">463 </span>  <span class="Delimiter">}</span>
 <span id="L464" class="LineNr">464 </span><span class="Delimiter">}</span>
 <span id="L465" class="LineNr">465 </span>
@@ -535,12 +536,12 @@ if ('onhashchange' in window) {
 <span id="L473" class="LineNr">473 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 <span id="L474" class="LineNr">474 </span><span class="Normal">case</span> RELOAD: <span class="Delimiter">{</span>
 <span id="L475" class="LineNr">475 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L476" class="LineNr">476 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'reload' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L477" class="LineNr">477 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'reload' requires exactly one ingredient, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L478" class="LineNr">478 </span>  <span class="Delimiter">}</span>
 <span id="L479" class="LineNr">479 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!is_mu_text<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-<span id="L480" class="LineNr">480 </span>    <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'reload' should be a string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
-<span id="L481" class="LineNr">481 </span>    <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'reload' should be a string, but got '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
+<span id="L481" class="LineNr">481 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L482" class="LineNr">482 </span>  <span class="Delimiter">}</span>
 <span id="L483" class="LineNr">483 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span id="L484" class="LineNr">484 </span><span class="Delimiter">}</span>
@@ -579,14 +580,14 @@ if ('onhashchange' in window) {
 <span id="L517" class="LineNr">517 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
 <span id="L518" class="LineNr">518 </span>  local-scope
 <span id="L519" class="LineNr">519 </span>  <span class="Normal">x</span>:text<span class="Special"> &lt;- </span><span class="Normal">new</span> [
-<span id="L520" class="LineNr">520 </span>    container foo [
-<span id="L521" class="LineNr">521 </span>      <span class="Normal">x</span>:num
-<span id="L522" class="LineNr">522 </span>      <span class="Normal">y</span>:num
-<span id="L523" class="LineNr">523 </span>    ]
-<span id="L524" class="LineNr">524 </span>    <a href='010vm.cc.html#L19'>recipe</a> bar [
-<span id="L525" class="LineNr">525 </span>      local-scope
-<span id="L526" class="LineNr">526 </span>      <span class="Normal">x</span>:foo<span class="Special"> &lt;- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
-<span id="L527" class="LineNr">527 </span>    ]
+<span id="L520" class="LineNr">520 </span>  <span class="Conceal">¦</span> container foo [
+<span id="L521" class="LineNr">521 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">x</span>:num
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">y</span>:num
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> ]
+<span id="L524" class="LineNr">524 </span>  <span class="Conceal">¦</span> <a href='010vm.cc.html#L19'>recipe</a> bar [
+<span id="L525" class="LineNr">525 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> local-scope
+<span id="L526" class="LineNr">526 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">x</span>:foo<span class="Special"> &lt;- </span>merge <span class="Constant">34</span><span class="Delimiter">,</span> <span class="Constant">35</span>
+<span id="L527" class="LineNr">527 </span>  <span class="Conceal">¦</span> ]
 <span id="L528" class="LineNr">528 </span>  ]
 <span id="L529" class="LineNr">529 </span>  <span class="Comment"># save warning addresses in locations of type 'number' to avoid spurious changes to them due to 'abandon'</span>
 <span id="L530" class="LineNr">530 </span>  <span class="Constant">1</span>:num/<span class="Special">raw &lt;- </span>reload x
diff --git a/html/channel.mu.html b/html/channel.mu.html
index df7d6b96..acae203d 100644
--- a/html/channel.mu.html
+++ b/html/channel.mu.html
@@ -15,13 +15,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
+.Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -65,14 +66,14 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr"> 7 </span>  <span class="Comment"># n = 0</span>
 <span id="L8" class="LineNr"> 8 </span>  n:char <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L9" class="LineNr"> 9 </span>  <span class="Delimiter">{</span>
-<span id="L10" class="LineNr">10 </span>    done?:bool <span class="Special">&lt;-</span> lesser-than n,<span class="Constant"> 5</span>
-<span id="L11" class="LineNr">11 </span>    <span class="muControl">break-unless</span> done?
-<span id="L12" class="LineNr">12 </span>    <span class="Comment"># other threads might get between these prints</span>
-<span id="L13" class="LineNr">13 </span>    $print <span class="Constant">[produce: ]</span>, n, <span class="Constant">[ </span>
+<span id="L10" class="LineNr">10 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> lesser-than n,<span class="Constant"> 5</span>
+<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> done?
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span> <span class="Comment"># other threads might get between these prints</span>
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> $print <span class="Constant">[produce: ]</span>, n, <span class="Constant">[ </span>
 <span id="L14" class="LineNr">14 </span><span class="Constant">]</span>
-<span id="L15" class="LineNr">15 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, n
-<span id="L16" class="LineNr">16 </span>    n <span class="Special">&lt;-</span> add n,<span class="Constant"> 1</span>
-<span id="L17" class="LineNr">17 </span>    <span class="muControl">loop</span>
+<span id="L15" class="LineNr">15 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, n
+<span id="L16" class="LineNr">16 </span>  <span class="Conceal">¦</span> n <span class="Special">&lt;-</span> add n,<span class="Constant"> 1</span>
+<span id="L17" class="LineNr">17 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L18" class="LineNr">18 </span>  <span class="Delimiter">}</span>
 <span id="L19" class="LineNr">19 </span>  close sink
 <span id="L20" class="LineNr">20 </span>]
@@ -82,13 +83,13 @@ if ('onhashchange' in window) {
 <span id="L24" class="LineNr">24 </span>  <span class="Constant">local-scope</span>
 <span id="L25" class="LineNr">25 </span>  <span class="Constant">load-ingredients</span>
 <span id="L26" class="LineNr">26 </span>  <span class="Delimiter">{</span>
-<span id="L27" class="LineNr">27 </span>    <span class="Comment"># read an integer from the channel</span>
-<span id="L28" class="LineNr">28 </span>    n:char, eof?:bool, source <span class="Special">&lt;-</span> read source
-<span id="L29" class="LineNr">29 </span>    <span class="muControl">break-if</span> eof?
-<span id="L30" class="LineNr">30 </span>    <span class="Comment"># other threads might get between these prints</span>
-<span id="L31" class="LineNr">31 </span>    $print <span class="Constant">[consume: ]</span>, n:char, <span class="Constant">[ </span>
+<span id="L27" class="LineNr">27 </span>  <span class="Conceal">¦</span> <span class="Comment"># read an integer from the channel</span>
+<span id="L28" class="LineNr">28 </span>  <span class="Conceal">¦</span> n:char, eof?:bool, source <span class="Special">&lt;-</span> read source
+<span id="L29" class="LineNr">29 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> eof?
+<span id="L30" class="LineNr">30 </span>  <span class="Conceal">¦</span> <span class="Comment"># other threads might get between these prints</span>
+<span id="L31" class="LineNr">31 </span>  <span class="Conceal">¦</span> $print <span class="Constant">[consume: ]</span>, n:char, <span class="Constant">[ </span>
 <span id="L32" class="LineNr">32 </span><span class="Constant">]</span>
-<span id="L33" class="LineNr">33 </span>    <span class="muControl">loop</span>
+<span id="L33" class="LineNr">33 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L34" class="LineNr">34 </span>  <span class="Delimiter">}</span>
 <span id="L35" class="LineNr">35 </span>]
 <span id="L36" class="LineNr">36 </span>
diff --git a/html/chessboard.mu.html b/html/chessboard.mu.html
index 419f3961..264a3607 100644
--- a/html/chessboard.mu.html
+++ b/html/chessboard.mu.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
-.Special { color: #c00000; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .CommentedCode { color: #6c6c6c; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muData { color: #ffff00; }
+.muControl { color: #c0a020; }
+.Special { color: #c00000; }
 -->
 </style>
 
@@ -88,38 +89,38 @@ if ('onhashchange' in window) {
 <span id="L26" class="LineNr"> 26 </span>  assume-screen <span class="Constant">120/width</span>, <span class="Constant">20/height</span>
 <span id="L27" class="LineNr"> 27 </span>  <span class="Comment"># initialize keyboard to type in a move</span>
 <span id="L28" class="LineNr"> 28 </span>  assume-console [
-<span id="L29" class="LineNr"> 29 </span>    type <span class="Constant">[a2-a4</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> type <span class="Constant">[a2-a4</span>
 <span id="L30" class="LineNr"> 30 </span><span class="Constant">]</span>
 <span id="L31" class="LineNr"> 31 </span>  ]
 <span id="L32" class="LineNr"> 32 </span>  run [
-<span id="L33" class="LineNr"> 33 </span>    <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, <a href='084console.mu.html#L23'>console</a>:&amp;:<a href='084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L68'>chessboard</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, <a href='084console.mu.html#L23'>console</a>:&amp;:<a href='084console.mu.html#L23'>console</a>
-<span id="L34" class="LineNr"> 34 </span>    <span class="Comment"># icon for the cursor</span>
-<span id="L35" class="LineNr"> 35 </span>    cursor-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L36" class="LineNr"> 36 </span>    <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, cursor-icon
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, <a href='084console.mu.html#L23'>console</a>:&amp;:<a href='084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L68'>chessboard</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, <a href='084console.mu.html#L23'>console</a>:&amp;:<a href='084console.mu.html#L23'>console</a>
+<span id="L34" class="LineNr"> 34 </span>  <span class="Conceal">¦</span> <span class="Comment"># icon for the cursor</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> cursor-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, cursor-icon
 <span id="L37" class="LineNr"> 37 </span>  ]
 <span id="L38" class="LineNr"> 38 </span>  screen-should-contain [
 <span id="L39" class="LineNr"> 39 </span>  <span class="Comment">#            1         2         3         4         5         6         7         8         9         10        11</span>
 <span id="L40" class="LineNr"> 40 </span>  <span class="Comment">#  012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789</span>
-<span id="L41" class="LineNr"> 41 </span>   <span class="Constant"> .Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves.         .</span>
-<span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .                                                                                                                        .</span>
-<span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .8 | r n b q k b n r                                                                                                     .</span>
-<span id="L44" class="LineNr"> 44 </span>   <span class="Constant"> .7 | p p p p p p p p                                                                                                     .</span>
-<span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> .6 |                                                                                                                     .</span>
-<span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> .5 |                                                                                                                     .</span>
-<span id="L47" class="LineNr"> 47 </span>   <span class="Constant"> .4 | P                                                                                                                   .</span>
-<span id="L48" class="LineNr"> 48 </span>   <span class="Constant"> .3 |                                                                                                                     .</span>
-<span id="L49" class="LineNr"> 49 </span>   <span class="Constant"> .2 |   P P P P P P P                                                                                                     .</span>
-<span id="L50" class="LineNr"> 50 </span>   <span class="Constant"> .1 | R N B Q K B N R                                                                                                     .</span>
-<span id="L51" class="LineNr"> 51 </span>   <span class="Constant"> .  +----------------                                                                                                     .</span>
-<span id="L52" class="LineNr"> 52 </span>   <span class="Constant"> .    a b c d e f g h                                                                                                     .</span>
-<span id="L53" class="LineNr"> 53 </span>   <span class="Constant"> .                                                                                                                        .</span>
-<span id="L54" class="LineNr"> 54 </span>   <span class="Constant"> .Type in your <a href='chessboard.mu.html#L228'>move</a> as &lt;from square&gt;-&lt;to square&gt;. For example: 'a2-a4'. Then press &lt;enter&gt;.                               .</span>
-<span id="L55" class="LineNr"> 55 </span>   <span class="Constant"> .                                                                                                                        .</span>
-<span id="L56" class="LineNr"> 56 </span>   <span class="Constant"> .Hit 'q' to exit.                                                                                                        .</span>
-<span id="L57" class="LineNr"> 57 </span>   <span class="Constant"> .                                                                                                                        .</span>
-<span id="L58" class="LineNr"> 58 </span>   <span class="Constant"> .move: ␣                                                                                                                 .</span>
-<span id="L59" class="LineNr"> 59 </span>   <span class="Constant"> .                                                                                                                        .</span>
-<span id="L60" class="LineNr"> 60 </span>   <span class="Constant"> .                                                                                                                        .</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span><span class="Constant"> .Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves.         .</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                                        .</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span><span class="Constant"> .8 | r n b q k b n r                                                                                                     .</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span><span class="Constant"> .7 | p p p p p p p p                                                                                                     .</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span><span class="Constant"> .6 |                                                                                                                     .</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span><span class="Constant"> .5 |                                                                                                                     .</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span><span class="Constant"> .4 | P                                                                                                                   .</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span><span class="Constant"> .3 |                                                                                                                     .</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span><span class="Constant"> .2 |   P P P P P P P                                                                                                     .</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span><span class="Constant"> .1 | R N B Q K B N R                                                                                                     .</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span><span class="Constant"> .  +----------------                                                                                                     .</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span><span class="Constant"> .    a b c d e f g h                                                                                                     .</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                                        .</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span><span class="Constant"> .Type in your <a href='chessboard.mu.html#L228'>move</a> as &lt;from square&gt;-&lt;to square&gt;. For example: 'a2-a4'. Then press &lt;enter&gt;.                               .</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                                        .</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span><span class="Constant"> .Hit 'q' to exit.                                                                                                        .</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                                        .</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span><span class="Constant"> .move: ␣                                                                                                                 .</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                                        .</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                                        .</span>
 <span id="L61" class="LineNr"> 61 </span>  ]
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 <span id="L63" class="LineNr"> 63 </span>
@@ -138,27 +139,27 @@ if ('onhashchange' in window) {
 <span id="L76" class="LineNr"> 76 </span>  buffered-stdin-in:&amp;:source:char, buffered-stdin-out:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">10/capacity</span>
 <span id="L77" class="LineNr"> 77 </span>  start-running <a href='075channel.mu.html#L388'>buffer-lines</a>, stdin-in, buffered-stdin-out
 <span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">{</span>
-<span id="L79" class="LineNr"> 79 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves.</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[Stupid text-mode chessboard. White pieces in uppercase; black pieces in lowercase. No checking for legal moves.</span>
 <span id="L80" class="LineNr"> 80 </span><span class="Constant">]</span>
-<span id="L81" class="LineNr"> 81 </span>    <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L82" class="LineNr"> 82 </span>    <a href='chessboard.mu.html#L143'>print-board</a> <a href='081print.mu.html#L4'>screen</a>, board
-<span id="L83" class="LineNr"> 83 </span>    <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L84" class="LineNr"> 84 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[Type in your <a href='chessboard.mu.html#L228'>move</a> as &lt;from square&gt;-&lt;to square&gt;. For example: 'a2-a4'. Then press &lt;enter&gt;.</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <a href='chessboard.mu.html#L143'>print-board</a> <a href='081print.mu.html#L4'>screen</a>, board
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[Type in your <a href='chessboard.mu.html#L228'>move</a> as &lt;from square&gt;-&lt;to square&gt;. For example: 'a2-a4'. Then press &lt;enter&gt;.</span>
 <span id="L85" class="LineNr"> 85 </span><span class="Constant">]</span>
-<span id="L86" class="LineNr"> 86 </span>    <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L87" class="LineNr"> 87 </span>    print <a href='081print.mu.html#L4'>screen</a> <span class="Constant">[Hit 'q' to exit.</span>
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a> <span class="Constant">[Hit 'q' to exit.</span>
 <span id="L88" class="LineNr"> 88 </span><span class="Constant">]</span>
-<span id="L89" class="LineNr"> 89 </span>    <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>      <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L91" class="LineNr"> 91 </span>      <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[move: ]</span>
-<span id="L92" class="LineNr"> 92 </span>      m:&amp;:<a href='chessboard.mu.html#L228'>move</a>, quit:bool, error:bool <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L237'>read-move</a> buffered-stdin-in, <a href='081print.mu.html#L4'>screen</a>
-<span id="L93" class="LineNr"> 93 </span>      <span class="muControl">break-if</span> quit, <span class="Constant">+quit</span>
-<span id="L94" class="LineNr"> 94 </span>      buffered-stdin-in <span class="Special">&lt;-</span> <a href='075channel.mu.html#L161'>clear</a> buffered-stdin-in  <span class="Comment"># cleanup after error. todo: test this?</span>
-<span id="L95" class="LineNr"> 95 </span>      <span class="muControl">loop-if</span> error
-<span id="L96" class="LineNr"> 96 </span>    <span class="Delimiter">}</span>
-<span id="L97" class="LineNr"> 97 </span>    board <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L536'>make-move</a> board, m
-<span id="L98" class="LineNr"> 98 </span>    <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L27'>clear-screen</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L99" class="LineNr"> 99 </span>    <span class="muControl">loop</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[move: ]</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> m:&amp;:<a href='chessboard.mu.html#L228'>move</a>, quit:bool, error:bool <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L237'>read-move</a> buffered-stdin-in, <a href='081print.mu.html#L4'>screen</a>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> quit, <span class="Constant">+quit</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> buffered-stdin-in <span class="Special">&lt;-</span> <a href='075channel.mu.html#L161'>clear</a> buffered-stdin-in  <span class="Comment"># cleanup after error. todo: test this?</span>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop-if</span> error
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> board <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L536'>make-move</a> board, m
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='081print.mu.html#L27'>clear-screen</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L100" class="LineNr">100 </span>  <span class="Delimiter">}</span>
 <span id="L101" class="LineNr">101 </span><span class="Constant">  +quit</span>
 <span id="L102" class="LineNr">102 </span>]
@@ -176,12 +177,12 @@ if ('onhashchange' in window) {
 <span id="L114" class="LineNr">114 </span>  board <span class="Special">&lt;-</span> new <span class="Delimiter">{</span>(address array character): type<span class="Delimiter">}</span>,<span class="Constant"> 8</span>
 <span id="L115" class="LineNr">115 </span>  col:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Delimiter">{</span>
-<span id="L117" class="LineNr">117 </span>    done?:bool <span class="Special">&lt;-</span> equal col,<span class="Constant"> 8</span>
-<span id="L118" class="LineNr">118 </span>    <span class="muControl">break-if</span> done?
-<span id="L119" class="LineNr">119 </span>    file:&amp;:@:char <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L126'>new-file</a> <a href='chessboard.mu.html#L179'>initial-position</a>, col
-<span id="L120" class="LineNr">120 </span>    *board <span class="Special">&lt;-</span> put-index *board, col, file
-<span id="L121" class="LineNr">121 </span>    col <span class="Special">&lt;-</span> add col,<span class="Constant"> 1</span>
-<span id="L122" class="LineNr">122 </span>    <span class="muControl">loop</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> equal col,<span class="Constant"> 8</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> file:&amp;:@:char <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L126'>new-file</a> <a href='chessboard.mu.html#L179'>initial-position</a>, col
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> *board <span class="Special">&lt;-</span> put-index *board, col, file
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> col <span class="Special">&lt;-</span> add col,<span class="Constant"> 1</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L123" class="LineNr">123 </span>  <span class="Delimiter">}</span>
 <span id="L124" class="LineNr">124 </span>]
 <span id="L125" class="LineNr">125 </span>
@@ -192,13 +193,13 @@ if ('onhashchange' in window) {
 <span id="L130" class="LineNr">130 </span>  result <span class="Special">&lt;-</span> new <span class="Constant">character:type</span>,<span class="Constant"> 8</span>
 <span id="L131" class="LineNr">131 </span>  row:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L132" class="LineNr">132 </span>  <span class="Delimiter">{</span>
-<span id="L133" class="LineNr">133 </span>    done?:bool <span class="Special">&lt;-</span> equal row,<span class="Constant"> 8</span>
-<span id="L134" class="LineNr">134 </span>    <span class="muControl">break-if</span> done?
-<span id="L135" class="LineNr">135 </span>    square:char <span class="Special">&lt;-</span> index *position, index
-<span id="L136" class="LineNr">136 </span>    *result <span class="Special">&lt;-</span> put-index *result, row, square
-<span id="L137" class="LineNr">137 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L138" class="LineNr">138 </span>    index <span class="Special">&lt;-</span> add index,<span class="Constant"> 1</span>
-<span id="L139" class="LineNr">139 </span>    <span class="muControl">loop</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> equal row,<span class="Constant"> 8</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> square:char <span class="Special">&lt;-</span> index *position, index
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> *result <span class="Special">&lt;-</span> put-index *result, row, square
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> index <span class="Special">&lt;-</span> add index,<span class="Constant"> 1</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L140" class="LineNr">140 </span>  <span class="Delimiter">}</span>
 <span id="L141" class="LineNr">141 </span>]
 <span id="L142" class="LineNr">142 </span>
@@ -209,27 +210,27 @@ if ('onhashchange' in window) {
 <span id="L147" class="LineNr">147 </span>  space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Comment"># print each row</span>
 <span id="L149" class="LineNr">149 </span>  <span class="Delimiter">{</span>
-<span id="L150" class="LineNr">150 </span>    done?:bool <span class="Special">&lt;-</span> lesser-than row,<span class="Constant"> 0</span>
-<span id="L151" class="LineNr">151 </span>    <span class="muControl">break-if</span> done?
-<span id="L152" class="LineNr">152 </span>    <span class="Comment"># print rank number as a legend</span>
-<span id="L153" class="LineNr">153 </span>    rank:num <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L154" class="LineNr">154 </span>    print <a href='081print.mu.html#L4'>screen</a>, rank
-<span id="L155" class="LineNr">155 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[ | ]</span>
-<span id="L156" class="LineNr">156 </span>    <span class="Comment"># print each square in the row</span>
-<span id="L157" class="LineNr">157 </span>    col:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
-<span id="L158" class="LineNr">158 </span>    <span class="Delimiter">{</span>
-<span id="L159" class="LineNr">159 </span>      done?:bool <span class="Special">&lt;-</span> equal col:num,<span class="Constant"> 8</span>
-<span id="L160" class="LineNr">160 </span>      <span class="muControl">break-if</span> done?:bool
-<span id="L161" class="LineNr">161 </span>      f:&amp;:@:char <span class="Special">&lt;-</span> index *board, col
-<span id="L162" class="LineNr">162 </span>      c:char <span class="Special">&lt;-</span> index *f, row
-<span id="L163" class="LineNr">163 </span>      print <a href='081print.mu.html#L4'>screen</a>, c
-<span id="L164" class="LineNr">164 </span>      print <a href='081print.mu.html#L4'>screen</a>, space
-<span id="L165" class="LineNr">165 </span>      col <span class="Special">&lt;-</span> add col,<span class="Constant"> 1</span>
-<span id="L166" class="LineNr">166 </span>      <span class="muControl">loop</span>
-<span id="L167" class="LineNr">167 </span>    <span class="Delimiter">}</span>
-<span id="L168" class="LineNr">168 </span>    row <span class="Special">&lt;-</span> subtract row,<span class="Constant"> 1</span>
-<span id="L169" class="LineNr">169 </span>    <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L170" class="LineNr">170 </span>    <span class="muControl">loop</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> lesser-than row,<span class="Constant"> 0</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Comment"># print rank number as a legend</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> rank:num <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, rank
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[ | ]</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Comment"># print each square in the row</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> col:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> equal col:num,<span class="Constant"> 8</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?:bool
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> f:&amp;:@:char <span class="Special">&lt;-</span> index *board, col
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *f, row
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, space
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> col <span class="Special">&lt;-</span> add col,<span class="Constant"> 1</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> subtract row,<span class="Constant"> 1</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L171" class="LineNr">171 </span>  <span class="Delimiter">}</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Comment"># print file letters as legend</span>
 <span id="L173" class="LineNr">173 </span>  print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[  +----------------]</span>
@@ -266,22 +267,22 @@ if ('onhashchange' in window) {
 <span id="L204" class="LineNr">204 </span>  board:board <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L179'>initial-position</a>
 <span id="L205" class="LineNr">205 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">12/height</span>
 <span id="L206" class="LineNr">206 </span>  run [
-<span id="L207" class="LineNr">207 </span>    <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L143'>print-board</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, board
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L143'>print-board</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, board
 <span id="L208" class="LineNr">208 </span>  ]
 <span id="L209" class="LineNr">209 </span>  screen-should-contain [
 <span id="L210" class="LineNr">210 </span>  <span class="Comment">#  012345678901234567890123456789</span>
-<span id="L211" class="LineNr">211 </span>   <span class="Constant"> .8 | r n b q k b n r           .</span>
-<span id="L212" class="LineNr">212 </span>   <span class="Constant"> .7 | p p p p p p p p           .</span>
-<span id="L213" class="LineNr">213 </span>   <span class="Constant"> .6 |                           .</span>
-<span id="L214" class="LineNr">214 </span>   <span class="Constant"> .5 |                           .</span>
-<span id="L215" class="LineNr">215 </span>   <span class="Constant"> .4 |                           .</span>
-<span id="L216" class="LineNr">216 </span>   <span class="Constant"> .3 |                           .</span>
-<span id="L217" class="LineNr">217 </span>   <span class="Constant"> .2 | P P P P P P P P           .</span>
-<span id="L218" class="LineNr">218 </span>   <span class="Constant"> .1 | R N B Q K B N R           .</span>
-<span id="L219" class="LineNr">219 </span>   <span class="Constant"> .  +----------------           .</span>
-<span id="L220" class="LineNr">220 </span>   <span class="Constant"> .    a b c d e f g h           .</span>
-<span id="L221" class="LineNr">221 </span>   <span class="Constant"> .                              .</span>
-<span id="L222" class="LineNr">222 </span>   <span class="Constant"> .                              .</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span><span class="Constant"> .8 | r n b q k b n r           .</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span><span class="Constant"> .7 | p p p p p p p p           .</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span><span class="Constant"> .6 |                           .</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span><span class="Constant"> .5 |                           .</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span><span class="Constant"> .4 |                           .</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span><span class="Constant"> .3 |                           .</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span><span class="Constant"> .2 | P P P P P P P P           .</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span><span class="Constant"> .1 | R N B Q K B N R           .</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span><span class="Constant"> .  +----------------           .</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span><span class="Constant"> .    a b c d e f g h           .</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span><span class="Constant"> .                              .</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span><span class="Constant"> .                              .</span>
 <span id="L223" class="LineNr">223 </span>  ]
 <span id="L224" class="LineNr">224 </span>]
 <span id="L225" class="LineNr">225 </span>
@@ -330,42 +331,42 @@ if ('onhashchange' in window) {
 <span id="L268" class="LineNr">268 </span>  c:char, eof?:bool, stdin <span class="Special">&lt;-</span> read stdin
 <span id="L269" class="LineNr">269 </span>  <span class="muControl">return-if</span> eof?, <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L270" class="LineNr">270 </span>  <span class="Delimiter">{</span>
-<span id="L271" class="LineNr">271 </span>    q-pressed?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">81/Q</span>
-<span id="L272" class="LineNr">272 </span>    <span class="muControl">break-unless</span> q-pressed?
-<span id="L273" class="LineNr">273 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> q-pressed?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">81/Q</span>
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> q-pressed?
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L274" class="LineNr">274 </span>  <span class="Delimiter">}</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Delimiter">{</span>
-<span id="L276" class="LineNr">276 </span>    q-pressed? <span class="Special">&lt;-</span> equal c, <span class="Constant">113/q</span>
-<span id="L277" class="LineNr">277 </span>    <span class="muControl">break-unless</span> q-pressed?
-<span id="L278" class="LineNr">278 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> q-pressed? <span class="Special">&lt;-</span> equal c, <span class="Constant">113/q</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> q-pressed?
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L279" class="LineNr">279 </span>  <span class="Delimiter">}</span>
 <span id="L280" class="LineNr">280 </span>  <span class="Delimiter">{</span>
-<span id="L281" class="LineNr">281 </span>    empty-fake-keyboard?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">0/eof</span>
-<span id="L282" class="LineNr">282 </span>    <span class="muControl">break-unless</span> empty-fake-keyboard?
-<span id="L283" class="LineNr">283 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> empty-fake-keyboard?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">0/eof</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> empty-fake-keyboard?
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L284" class="LineNr">284 </span>  <span class="Delimiter">}</span>
 <span id="L285" class="LineNr">285 </span>  <span class="Delimiter">{</span>
-<span id="L286" class="LineNr">286 </span>    newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L287" class="LineNr">287 </span>    <span class="muControl">break-unless</span> newline?
-<span id="L288" class="LineNr">288 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[that's not enough]</span>
-<span id="L289" class="LineNr">289 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[that's not enough]</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
 <span id="L290" class="LineNr">290 </span>  <span class="Delimiter">}</span>
 <span id="L291" class="LineNr">291 </span>  file:num <span class="Special">&lt;-</span> subtract c, <span class="Constant">97/a</span>
 <span id="L292" class="LineNr">292 </span>  <span class="Comment"># 'a' &lt;= file &lt;= 'h'</span>
 <span id="L293" class="LineNr">293 </span>  <span class="Delimiter">{</span>
-<span id="L294" class="LineNr">294 </span>    above-min:bool <span class="Special">&lt;-</span> greater-or-equal file,<span class="Constant"> 0</span>
-<span id="L295" class="LineNr">295 </span>    <span class="muControl">break-if</span> above-min
-<span id="L296" class="LineNr">296 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[file too low: ]</span>
-<span id="L297" class="LineNr">297 </span>    print <a href='081print.mu.html#L4'>screen</a>, c
-<span id="L298" class="LineNr">298 </span>    <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
-<span id="L299" class="LineNr">299 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span> above-min:bool <span class="Special">&lt;-</span> greater-or-equal file,<span class="Constant"> 0</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> above-min
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[file too low: ]</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L567'>cursor-to-next-line</a> <a href='081print.mu.html#L4'>screen</a>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
 <span id="L300" class="LineNr">300 </span>  <span class="Delimiter">}</span>
 <span id="L301" class="LineNr">301 </span>  <span class="Delimiter">{</span>
-<span id="L302" class="LineNr">302 </span>    below-max:bool <span class="Special">&lt;-</span> lesser-than file,<span class="Constant"> 8</span>
-<span id="L303" class="LineNr">303 </span>    <span class="muControl">break-if</span> below-max
-<span id="L304" class="LineNr">304 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[file too high: ]</span>
-<span id="L305" class="LineNr">305 </span>    print <a href='081print.mu.html#L4'>screen</a>, c
-<span id="L306" class="LineNr">306 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> below-max:bool <span class="Special">&lt;-</span> lesser-than file,<span class="Constant"> 8</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> below-max
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[file too high: ]</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
 <span id="L307" class="LineNr">307 </span>  <span class="Delimiter">}</span>
 <span id="L308" class="LineNr">308 </span>  <span class="muControl">return</span> file, <span class="Constant">0/quit</span>, <span class="Constant">0/error</span>
 <span id="L309" class="LineNr">309 </span>]
@@ -377,36 +378,36 @@ if ('onhashchange' in window) {
 <span id="L315" class="LineNr">315 </span>  c:char, eof?:bool, stdin <span class="Special">&lt;-</span> read stdin
 <span id="L316" class="LineNr">316 </span>  <span class="muControl">return-if</span> eof?, <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Delimiter">{</span>
-<span id="L318" class="LineNr">318 </span>    q-pressed?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">8/Q</span>
-<span id="L319" class="LineNr">319 </span>    <span class="muControl">break-unless</span> q-pressed?
-<span id="L320" class="LineNr">320 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span> q-pressed?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">8/Q</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> q-pressed?
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L321" class="LineNr">321 </span>  <span class="Delimiter">}</span>
 <span id="L322" class="LineNr">322 </span>  <span class="Delimiter">{</span>
-<span id="L323" class="LineNr">323 </span>    q-pressed? <span class="Special">&lt;-</span> equal c, <span class="Constant">113/q</span>
-<span id="L324" class="LineNr">324 </span>    <span class="muControl">break-unless</span> q-pressed?
-<span id="L325" class="LineNr">325 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span> q-pressed? <span class="Special">&lt;-</span> equal c, <span class="Constant">113/q</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> q-pressed?
+<span id="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">1/quit</span>, <span class="Constant">0/error</span>
 <span id="L326" class="LineNr">326 </span>  <span class="Delimiter">}</span>
 <span id="L327" class="LineNr">327 </span>  <span class="Delimiter">{</span>
-<span id="L328" class="LineNr">328 </span>    newline?:bool <span class="Special">&lt;-</span> equal c,<span class="Constant"> 10</span>  <span class="Comment"># newline</span>
-<span id="L329" class="LineNr">329 </span>    <span class="muControl">break-unless</span> newline?
-<span id="L330" class="LineNr">330 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[that's not enough]</span>
-<span id="L331" class="LineNr">331 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c,<span class="Constant"> 10</span>  <span class="Comment"># newline</span>
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L330" class="LineNr">330 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[that's not enough]</span>
+<span id="L331" class="LineNr">331 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
 <span id="L332" class="LineNr">332 </span>  <span class="Delimiter">}</span>
 <span id="L333" class="LineNr">333 </span>  rank:num <span class="Special">&lt;-</span> subtract c, <span class="Constant">49/'1'</span>
 <span id="L334" class="LineNr">334 </span>  <span class="Comment"># assert'1' &lt;= rank &lt;= '8'</span>
 <span id="L335" class="LineNr">335 </span>  <span class="Delimiter">{</span>
-<span id="L336" class="LineNr">336 </span>    above-min:bool <span class="Special">&lt;-</span> greater-or-equal rank,<span class="Constant"> 0</span>
-<span id="L337" class="LineNr">337 </span>    <span class="muControl">break-if</span> above-min
-<span id="L338" class="LineNr">338 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[rank too low: ]</span>
-<span id="L339" class="LineNr">339 </span>    print <a href='081print.mu.html#L4'>screen</a>, c
-<span id="L340" class="LineNr">340 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span> above-min:bool <span class="Special">&lt;-</span> greater-or-equal rank,<span class="Constant"> 0</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> above-min
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[rank too low: ]</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
 <span id="L341" class="LineNr">341 </span>  <span class="Delimiter">}</span>
 <span id="L342" class="LineNr">342 </span>  <span class="Delimiter">{</span>
-<span id="L343" class="LineNr">343 </span>    below-max:bool <span class="Special">&lt;-</span> lesser-or-equal rank,<span class="Constant"> 7</span>
-<span id="L344" class="LineNr">344 </span>    <span class="muControl">break-if</span> below-max
-<span id="L345" class="LineNr">345 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[rank too high: ]</span>
-<span id="L346" class="LineNr">346 </span>    print <a href='081print.mu.html#L4'>screen</a>, c
-<span id="L347" class="LineNr">347 </span>    <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span> below-max:bool <span class="Special">&lt;-</span> lesser-or-equal rank,<span class="Constant"> 7</span>
+<span id="L344" class="LineNr">344 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> below-max
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[rank too high: ]</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/dummy</span>, <span class="Constant">0/quit</span>, <span class="Constant">1/error</span>
 <span id="L348" class="LineNr">348 </span>  <span class="Delimiter">}</span>
 <span id="L349" class="LineNr">349 </span>  <span class="muControl">return</span> rank, <span class="Constant">0/quit</span>, <span class="Constant">0/error</span>
 <span id="L350" class="LineNr">350 </span>]
@@ -419,9 +420,9 @@ if ('onhashchange' in window) {
 <span id="L357" class="LineNr">357 </span>  c:char, eof?:bool, stdin <span class="Special">&lt;-</span> read stdin
 <span id="L358" class="LineNr">358 </span>  <span class="muControl">return-if</span> eof? <span class="Constant">1/true</span>
 <span id="L359" class="LineNr">359 </span>  <span class="Delimiter">{</span>
-<span id="L360" class="LineNr">360 </span>    match?:bool <span class="Special">&lt;-</span> equal c, expected
-<span id="L361" class="LineNr">361 </span>    <span class="muControl">break-if</span> match?
-<span id="L362" class="LineNr">362 </span>    print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[expected character not found]</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span> match?:bool <span class="Special">&lt;-</span> equal c, expected
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> match?
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, <span class="Constant">[expected character not found]</span>
 <span id="L363" class="LineNr">363 </span>  <span class="Delimiter">}</span>
 <span id="L364" class="LineNr">364 </span>  result <span class="Special">&lt;-</span> not match?
 <span id="L365" class="LineNr">365 </span>]
@@ -432,70 +433,70 @@ if ('onhashchange' in window) {
 <span id="L370" class="LineNr">370 </span>  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">2/capacity</span>
 <span id="L371" class="LineNr">371 </span>  read-move-routine:num/routine <span class="Special">&lt;-</span> start-running <a href='chessboard.mu.html#L237'>read-move</a>, source, <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
 <span id="L372" class="LineNr">372 </span>  run [
-<span id="L373" class="LineNr">373 </span>    <span class="Comment"># 'read-move' is waiting for input</span>
-<span id="L374" class="LineNr">374 </span>    wait-for-routine-to-block read-move-routine
-<span id="L375" class="LineNr">375 </span>    read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L376" class="LineNr">376 </span>    waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L377" class="LineNr">377 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' is waiting for input</span>
+<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L375" class="LineNr">375 </span>  <span class="Conceal">¦</span> read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span> waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L378" class="LineNr">378 </span><span class="Constant">F read-move-blocking: routine failed to pause after coming up (before any keys were pressed)]</span>
-<span id="L379" class="LineNr">379 </span>    <span class="Comment"># press 'a'</span>
-<span id="L380" class="LineNr">380 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
-<span id="L381" class="LineNr">381 </span>    restart read-move-routine
-<span id="L382" class="LineNr">382 </span>    <span class="Comment"># 'read-move' still waiting for input</span>
-<span id="L383" class="LineNr">383 </span>    wait-for-routine-to-block read-move-routine
-<span id="L384" class="LineNr">384 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L385" class="LineNr">385 </span>    waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L386" class="LineNr">386 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L379" class="LineNr">379 </span>  <span class="Conceal">¦</span> <span class="Comment"># press 'a'</span>
+<span id="L380" class="LineNr">380 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' still waiting for input</span>
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L385" class="LineNr">385 </span>  <span class="Conceal">¦</span> waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L387" class="LineNr">387 </span><span class="Constant">F read-move-blocking: routine failed to pause after rank 'a']</span>
-<span id="L388" class="LineNr">388 </span>    <span class="Comment"># press '2'</span>
-<span id="L389" class="LineNr">389 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">50/'2'</span>
-<span id="L390" class="LineNr">390 </span>    restart read-move-routine
-<span id="L391" class="LineNr">391 </span>    <span class="Comment"># 'read-move' still waiting for input</span>
-<span id="L392" class="LineNr">392 </span>    wait-for-routine-to-block read-move-routine
-<span id="L393" class="LineNr">393 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L394" class="LineNr">394 </span>    waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L395" class="LineNr">395 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span> <span class="Comment"># press '2'</span>
+<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">50/'2'</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' still waiting for input</span>
+<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span> waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L396" class="LineNr">396 </span><span class="Constant">F read-move-blocking: routine failed to pause after file 'a2']</span>
-<span id="L397" class="LineNr">397 </span>    <span class="Comment"># press '-'</span>
-<span id="L398" class="LineNr">398 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">45/'-'</span>
-<span id="L399" class="LineNr">399 </span>    restart read-move-routine
-<span id="L400" class="LineNr">400 </span>    <span class="Comment"># 'read-move' still waiting for input</span>
-<span id="L401" class="LineNr">401 </span>    wait-for-routine-to-block read-move-routine
-<span id="L402" class="LineNr">402 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L403" class="LineNr">403 </span>    waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L404" class="LineNr">404 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span> <span class="Comment"># press '-'</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">45/'-'</span>
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' still waiting for input</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span> waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L404" class="LineNr">404 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L405" class="LineNr">405 </span><span class="Constant">F read-move-blocking: routine failed to pause after hyphen 'a2-']</span>
-<span id="L406" class="LineNr">406 </span>    <span class="Comment"># press 'a'</span>
-<span id="L407" class="LineNr">407 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
-<span id="L408" class="LineNr">408 </span>    restart read-move-routine
-<span id="L409" class="LineNr">409 </span>    <span class="Comment"># 'read-move' still waiting for input</span>
-<span id="L410" class="LineNr">410 </span>    wait-for-routine-to-block read-move-routine
-<span id="L411" class="LineNr">411 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L412" class="LineNr">412 </span>    waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L413" class="LineNr">413 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L406" class="LineNr">406 </span>  <span class="Conceal">¦</span> <span class="Comment"># press 'a'</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
+<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' still waiting for input</span>
+<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L414" class="LineNr">414 </span><span class="Constant">F read-move-blocking: routine failed to pause after rank 'a2-a']</span>
-<span id="L415" class="LineNr">415 </span>    <span class="Comment"># press '4'</span>
-<span id="L416" class="LineNr">416 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">52/'4'</span>
-<span id="L417" class="LineNr">417 </span>    restart read-move-routine
-<span id="L418" class="LineNr">418 </span>    <span class="Comment"># 'read-move' still waiting for input</span>
-<span id="L419" class="LineNr">419 </span>    wait-for-routine-to-block read-move-routine
-<span id="L420" class="LineNr">420 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L421" class="LineNr">421 </span>    waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L422" class="LineNr">422 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Comment"># press '4'</span>
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">52/'4'</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' still waiting for input</span>
+<span id="L419" class="LineNr">419 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> waiting? <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L423" class="LineNr">423 </span><span class="Constant">F read-move-blocking: routine failed to pause after file 'a2-a4']</span>
-<span id="L424" class="LineNr">424 </span>    <span class="Comment"># press 'newline'</span>
-<span id="L425" class="LineNr">425 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 10</span>  <span class="Comment"># newline</span>
-<span id="L426" class="LineNr">426 </span>    restart read-move-routine
-<span id="L427" class="LineNr">427 </span>    <span class="Comment"># 'read-move' now completes</span>
-<span id="L428" class="LineNr">428 </span>    wait-for-routine-to-block read-move-routine
-<span id="L429" class="LineNr">429 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L430" class="LineNr">430 </span>    completed?:bool <span class="Special">&lt;-</span> equal read-move-state, <span class="Constant">1/completed</span>
-<span id="L431" class="LineNr">431 </span>    assert completed?, <span class="Constant">[ </span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> <span class="Comment"># press 'newline'</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink,<span class="Constant"> 10</span>  <span class="Comment"># newline</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' now completes</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span> completed?:bool <span class="Special">&lt;-</span> equal read-move-state, <span class="Constant">1/completed</span>
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span> assert completed?, <span class="Constant">[ </span>
 <span id="L432" class="LineNr">432 </span><span class="Constant">F read-move-blocking: routine failed to terminate on newline]</span>
-<span id="L433" class="LineNr">433 </span>    trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
 <span id="L434" class="LineNr">434 </span>  ]
 <span id="L435" class="LineNr">435 </span>  trace-should-contain [
-<span id="L436" class="LineNr">436 </span>    test: reached end
+<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> test: reached end
 <span id="L437" class="LineNr">437 </span>  ]
 <span id="L438" class="LineNr">438 </span>]
 <span id="L439" class="LineNr">439 </span>
@@ -505,25 +506,25 @@ if ('onhashchange' in window) {
 <span id="L443" class="LineNr">443 </span>  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">2/capacity</span>
 <span id="L444" class="LineNr">444 </span>  read-move-routine:num <span class="Special">&lt;-</span> start-running <a href='chessboard.mu.html#L237'>read-move</a>, source, <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
 <span id="L445" class="LineNr">445 </span>  run [
-<span id="L446" class="LineNr">446 </span>    <span class="Comment"># 'read-move' is waiting for input</span>
-<span id="L447" class="LineNr">447 </span>    wait-for-routine-to-block read-move-routine
-<span id="L448" class="LineNr">448 </span>    read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L449" class="LineNr">449 </span>    waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L450" class="LineNr">450 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' is waiting for input</span>
+<span id="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L448" class="LineNr">448 </span>  <span class="Conceal">¦</span> read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L449" class="LineNr">449 </span>  <span class="Conceal">¦</span> waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L450" class="LineNr">450 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L451" class="LineNr">451 </span><span class="Constant">F read-move-quit: routine failed to pause after coming up (before any keys were pressed)]</span>
-<span id="L452" class="LineNr">452 </span>    <span class="Comment"># press 'q'</span>
-<span id="L453" class="LineNr">453 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">113/q</span>
-<span id="L454" class="LineNr">454 </span>    restart read-move-routine
-<span id="L455" class="LineNr">455 </span>    <span class="Comment"># 'read-move' completes</span>
-<span id="L456" class="LineNr">456 </span>    wait-for-routine-to-block read-move-routine
-<span id="L457" class="LineNr">457 </span>    read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L458" class="LineNr">458 </span>    completed?:bool <span class="Special">&lt;-</span> equal read-move-state, <span class="Constant">1/completed</span>
-<span id="L459" class="LineNr">459 </span>    assert completed?, <span class="Constant">[ </span>
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span> <span class="Comment"># press 'q'</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">113/q</span>
+<span id="L454" class="LineNr">454 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L455" class="LineNr">455 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' completes</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L457" class="LineNr">457 </span>  <span class="Conceal">¦</span> read-move-state <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span> completed?:bool <span class="Special">&lt;-</span> equal read-move-state, <span class="Constant">1/completed</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> assert completed?, <span class="Constant">[ </span>
 <span id="L460" class="LineNr">460 </span><span class="Constant">F read-move-quit: routine failed to terminate on 'q']</span>
-<span id="L461" class="LineNr">461 </span>    trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 1</span>, <span class="Constant">[test]</span>, <span class="Constant">[reached end]</span>
 <span id="L462" class="LineNr">462 </span>  ]
 <span id="L463" class="LineNr">463 </span>  trace-should-contain [
-<span id="L464" class="LineNr">464 </span>    test: reached end
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span> test: reached end
 <span id="L465" class="LineNr">465 </span>  ]
 <span id="L466" class="LineNr">466 </span>]
 <span id="L467" class="LineNr">467 </span>
@@ -533,19 +534,19 @@ if ('onhashchange' in window) {
 <span id="L471" class="LineNr">471 </span>  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">2/capacity</span>
 <span id="L472" class="LineNr">472 </span>  read-move-routine:num <span class="Special">&lt;-</span> start-running <a href='chessboard.mu.html#L237'>read-move</a>, source, <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
 <span id="L473" class="LineNr">473 </span>  run [
-<span id="L474" class="LineNr">474 </span>    <span class="Comment"># 'read-move' is waiting for input</span>
-<span id="L475" class="LineNr">475 </span>    wait-for-routine-to-block read-move-routine
-<span id="L476" class="LineNr">476 </span>    read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L477" class="LineNr">477 </span>    waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L478" class="LineNr">478 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' is waiting for input</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L477" class="LineNr">477 </span>  <span class="Conceal">¦</span> waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L478" class="LineNr">478 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L479" class="LineNr">479 </span><span class="Constant">F read-move-illegal-file: routine failed to pause after coming up (before any keys were pressed)]</span>
-<span id="L480" class="LineNr">480 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">50/'2'</span>
-<span id="L481" class="LineNr">481 </span>    restart read-move-routine
-<span id="L482" class="LineNr">482 </span>    wait-for-routine-to-block read-move-routine
+<span id="L480" class="LineNr">480 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">50/'2'</span>
+<span id="L481" class="LineNr">481 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L482" class="LineNr">482 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
 <span id="L483" class="LineNr">483 </span>  ]
 <span id="L484" class="LineNr">484 </span>  screen-should-contain [
-<span id="L485" class="LineNr">485 </span>   <span class="Constant"> .file too low: 2     .</span>
-<span id="L486" class="LineNr">486 </span>   <span class="Constant"> .                    .</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span><span class="Constant"> .file too low: 2     .</span>
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span><span class="Constant"> .                    .</span>
 <span id="L487" class="LineNr">487 </span>  ]
 <span id="L488" class="LineNr">488 </span>]
 <span id="L489" class="LineNr">489 </span>
@@ -555,20 +556,20 @@ if ('onhashchange' in window) {
 <span id="L493" class="LineNr">493 </span>  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">2/capacity</span>
 <span id="L494" class="LineNr">494 </span>  read-move-routine:num <span class="Special">&lt;-</span> start-running <a href='chessboard.mu.html#L237'>read-move</a>, source, <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
 <span id="L495" class="LineNr">495 </span>  run [
-<span id="L496" class="LineNr">496 </span>    <span class="Comment"># 'read-move' is waiting for input</span>
-<span id="L497" class="LineNr">497 </span>    wait-for-routine-to-block read-move-routine
-<span id="L498" class="LineNr">498 </span>    read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L499" class="LineNr">499 </span>    waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L500" class="LineNr">500 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L496" class="LineNr">496 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' is waiting for input</span>
+<span id="L497" class="LineNr">497 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L501" class="LineNr">501 </span><span class="Constant">F read-move-illegal-rank: routine failed to pause after coming up (before any keys were pressed)]</span>
-<span id="L502" class="LineNr">502 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
-<span id="L503" class="LineNr">503 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
-<span id="L504" class="LineNr">504 </span>    restart read-move-routine
-<span id="L505" class="LineNr">505 </span>    wait-for-routine-to-block read-move-routine
+<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
+<span id="L504" class="LineNr">504 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L505" class="LineNr">505 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
 <span id="L506" class="LineNr">506 </span>  ]
 <span id="L507" class="LineNr">507 </span>  screen-should-contain [
-<span id="L508" class="LineNr">508 </span>   <span class="Constant"> .rank too high: a    .</span>
-<span id="L509" class="LineNr">509 </span>   <span class="Constant"> .                    .</span>
+<span id="L508" class="LineNr">508 </span>  <span class="Conceal">¦</span><span class="Constant"> .rank too high: a    .</span>
+<span id="L509" class="LineNr">509 </span>  <span class="Conceal">¦</span><span class="Constant"> .                    .</span>
 <span id="L510" class="LineNr">510 </span>  ]
 <span id="L511" class="LineNr">511 </span>]
 <span id="L512" class="LineNr">512 </span>
@@ -578,20 +579,20 @@ if ('onhashchange' in window) {
 <span id="L516" class="LineNr">516 </span>  source:&amp;:source:char, sink:&amp;:sink:char <span class="Special">&lt;-</span> <a href='075channel.mu.html#L51'>new-channel</a> <span class="Constant">2/capacity</span>
 <span id="L517" class="LineNr">517 </span>  read-move-routine:num <span class="Special">&lt;-</span> start-running <a href='chessboard.mu.html#L237'>read-move</a>, source, <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>
 <span id="L518" class="LineNr">518 </span>  run [
-<span id="L519" class="LineNr">519 </span>    <span class="Comment"># 'read-move' is waiting for input</span>
-<span id="L520" class="LineNr">520 </span>    wait-for-routine-to-block read-move-routine
-<span id="L521" class="LineNr">521 </span>    read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
-<span id="L522" class="LineNr">522 </span>    waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
-<span id="L523" class="LineNr">523 </span>    assert waiting?, <span class="Constant">[ </span>
+<span id="L519" class="LineNr">519 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'read-move' is waiting for input</span>
+<span id="L520" class="LineNr">520 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
+<span id="L521" class="LineNr">521 </span>  <span class="Conceal">¦</span> read-move-state:num <span class="Special">&lt;-</span> routine-state read-move-routine
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> waiting?:bool <span class="Special">&lt;-</span> not-equal read-move-state, <span class="Constant">2/discontinued</span>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> assert waiting?, <span class="Constant">[ </span>
 <span id="L524" class="LineNr">524 </span><span class="Constant">F read-move-empty: routine failed to pause after coming up (before any keys were pressed)]</span>
-<span id="L525" class="LineNr">525 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">10/newline</span>
-<span id="L526" class="LineNr">526 </span>    sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
-<span id="L527" class="LineNr">527 </span>    restart read-move-routine
-<span id="L528" class="LineNr">528 </span>    wait-for-routine-to-block read-move-routine
+<span id="L525" class="LineNr">525 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">10/newline</span>
+<span id="L526" class="LineNr">526 </span>  <span class="Conceal">¦</span> sink <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink, <span class="Constant">97/a</span>
+<span id="L527" class="LineNr">527 </span>  <span class="Conceal">¦</span> restart read-move-routine
+<span id="L528" class="LineNr">528 </span>  <span class="Conceal">¦</span> wait-for-routine-to-block read-move-routine
 <span id="L529" class="LineNr">529 </span>  ]
 <span id="L530" class="LineNr">530 </span>  screen-should-contain [
-<span id="L531" class="LineNr">531 </span>   <span class="Constant"> .that's not enough   .</span>
-<span id="L532" class="LineNr">532 </span>   <span class="Constant"> .                    .</span>
+<span id="L531" class="LineNr">531 </span>  <span class="Conceal">¦</span><span class="Constant"> .that's not enough   .</span>
+<span id="L532" class="LineNr">532 </span>  <span class="Conceal">¦</span><span class="Constant"> .                    .</span>
 <span id="L533" class="LineNr">533 </span>  ]
 <span id="L534" class="LineNr">534 </span>]
 <span id="L535" class="LineNr">535 </span>
@@ -616,22 +617,22 @@ if ('onhashchange' in window) {
 <span id="L554" class="LineNr">554 </span>  <a href='chessboard.mu.html#L228'>move</a>:&amp;:<a href='chessboard.mu.html#L228'>move</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='chessboard.mu.html#L228'>move</a>:type</span>
 <span id="L555" class="LineNr">555 </span>  *move <span class="Special">&lt;-</span> merge <span class="Constant">6/g</span>, <span class="Constant">1/'2'</span>, <span class="Constant">6/g</span>, <span class="Constant">3/'4'</span>
 <span id="L556" class="LineNr">556 </span>  run [
-<span id="L557" class="LineNr">557 </span>    board <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L536'>make-move</a> board, <a href='chessboard.mu.html#L228'>move</a>
-<span id="L558" class="LineNr">558 </span>    <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L143'>print-board</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, board
+<span id="L557" class="LineNr">557 </span>  <span class="Conceal">¦</span> board <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L536'>make-move</a> board, <a href='chessboard.mu.html#L228'>move</a>
+<span id="L558" class="LineNr">558 </span>  <span class="Conceal">¦</span> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='chessboard.mu.html#L143'>print-board</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, board
 <span id="L559" class="LineNr">559 </span>  ]
 <span id="L560" class="LineNr">560 </span>  screen-should-contain [
 <span id="L561" class="LineNr">561 </span>  <span class="Comment">#  012345678901234567890123456789</span>
-<span id="L562" class="LineNr">562 </span>   <span class="Constant"> .8 | r n b q k b n r           .</span>
-<span id="L563" class="LineNr">563 </span>   <span class="Constant"> .7 | p p p p p p p p           .</span>
-<span id="L564" class="LineNr">564 </span>   <span class="Constant"> .6 |                           .</span>
-<span id="L565" class="LineNr">565 </span>   <span class="Constant"> .5 |                           .</span>
-<span id="L566" class="LineNr">566 </span>   <span class="Constant"> .4 |             P             .</span>
-<span id="L567" class="LineNr">567 </span>   <span class="Constant"> .3 |                           .</span>
-<span id="L568" class="LineNr">568 </span>   <span class="Constant"> .2 | P P P P P P   P           .</span>
-<span id="L569" class="LineNr">569 </span>   <span class="Constant"> .1 | R N B Q K B N R           .</span>
-<span id="L570" class="LineNr">570 </span>   <span class="Constant"> .  +----------------           .</span>
-<span id="L571" class="LineNr">571 </span>   <span class="Constant"> .    a b c d e f g h           .</span>
-<span id="L572" class="LineNr">572 </span>   <span class="Constant"> .                              .</span>
+<span id="L562" class="LineNr">562 </span>  <span class="Conceal">¦</span><span class="Constant"> .8 | r n b q k b n r           .</span>
+<span id="L563" class="LineNr">563 </span>  <span class="Conceal">¦</span><span class="Constant"> .7 | p p p p p p p p           .</span>
+<span id="L564" class="LineNr">564 </span>  <span class="Conceal">¦</span><span class="Constant"> .6 |                           .</span>
+<span id="L565" class="LineNr">565 </span>  <span class="Conceal">¦</span><span class="Constant"> .5 |                           .</span>
+<span id="L566" class="LineNr">566 </span>  <span class="Conceal">¦</span><span class="Constant"> .4 |             P             .</span>
+<span id="L567" class="LineNr">567 </span>  <span class="Conceal">¦</span><span class="Constant"> .3 |                           .</span>
+<span id="L568" class="LineNr">568 </span>  <span class="Conceal">¦</span><span class="Constant"> .2 | P P P P P P   P           .</span>
+<span id="L569" class="LineNr">569 </span>  <span class="Conceal">¦</span><span class="Constant"> .1 | R N B Q K B N R           .</span>
+<span id="L570" class="LineNr">570 </span>  <span class="Conceal">¦</span><span class="Constant"> .  +----------------           .</span>
+<span id="L571" class="LineNr">571 </span>  <span class="Conceal">¦</span><span class="Constant"> .    a b c d e f g h           .</span>
+<span id="L572" class="LineNr">572 </span>  <span class="Conceal">¦</span><span class="Constant"> .                              .</span>
 <span id="L573" class="LineNr">573 </span>  ]
 <span id="L574" class="LineNr">574 </span>]
 </pre>
diff --git a/html/console.mu.html b/html/console.mu.html
index 60e3eb3e..11cae6ee 100644
--- a/html/console.mu.html
+++ b/html/console.mu.html
@@ -15,13 +15,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -64,10 +65,10 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr"> 6 </span>  <span class="Constant">local-scope</span>
 <span id="L7" class="LineNr"> 7 </span>  open-console
 <span id="L8" class="LineNr"> 8 </span>  <span class="Delimiter">{</span>
-<span id="L9" class="LineNr"> 9 </span>    e:<a href='084console.mu.html#L4'>event</a>, found?:bool <span class="Special">&lt;-</span> check-for-interaction
-<span id="L10" class="LineNr">10 </span>    <span class="muControl">break-if</span> found?
-<span id="L11" class="LineNr">11 </span>    print-character-to-display<span class="Constant"> 97</span>, <span class="Constant">7/white</span>
-<span id="L12" class="LineNr">12 </span>    <span class="muControl">loop</span>
+<span id="L9" class="LineNr"> 9 </span>  <span class="Conceal">¦</span> e:<a href='084console.mu.html#L4'>event</a>, found?:bool <span class="Special">&lt;-</span> check-for-interaction
+<span id="L10" class="LineNr">10 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span> print-character-to-display<span class="Constant"> 97</span>, <span class="Constant">7/white</span>
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L13" class="LineNr">13 </span>  <span class="Delimiter">}</span>
 <span id="L14" class="LineNr">14 </span>  close-console
 <span id="L15" class="LineNr">15 </span>  $print e, <span class="Constant">10/newline</span>
diff --git a/html/counters.mu.html b/html/counters.mu.html
index c4421907..83bd44ce 100644
--- a/html/counters.mu.html
+++ b/html/counters.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/display.mu.html b/html/display.mu.html
index b1d02462..47bf1892 100644
--- a/html/display.mu.html
+++ b/html/display.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/edit/001-editor.mu.html b/html/edit/001-editor.mu.html
index fc380b8d..1355cf75 100644
--- a/html/edit/001-editor.mu.html
+++ b/html/edit/001-editor.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -80,13 +81,13 @@ if ('onhashchange' in window) {
 <span id="L19" class="LineNr"> 19 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
 <span id="L20" class="LineNr"> 20 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L21" class="LineNr"> 21 </span>  run [
-<span id="L22" class="LineNr"> 22 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L23" class="LineNr"> 23 </span>  ]
 <span id="L24" class="LineNr"> 24 </span>  screen-should-contain [
-<span id="L25" class="LineNr"> 25 </span>    <span class="Comment"># top line of screen reserved for menu</span>
-<span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> .          .</span>
-<span id="L27" class="LineNr"> 27 </span>   <span class="Constant"> .abc       .</span>
-<span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> .          .</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Comment"># top line of screen reserved for menu</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L29" class="LineNr"> 29 </span>  ]
 <span id="L30" class="LineNr"> 30 </span>]
 <span id="L31" class="LineNr"> 31 </span>
@@ -142,14 +143,14 @@ if ('onhashchange' in window) {
 <span id="L81" class="LineNr"> 81 </span>  <span class="Comment"># now we can start appending the rest, character by character</span>
 <span id="L82" class="LineNr"> 82 </span>  curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
 <span id="L83" class="LineNr"> 83 </span>  <span class="Delimiter">{</span>
-<span id="L84" class="LineNr"> 84 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal idx, len
-<span id="L85" class="LineNr"> 85 </span>    <span class="muControl">break-if</span> done?
-<span id="L86" class="LineNr"> 86 </span>    c:char <span class="Special">&lt;-</span> index *text, idx
-<span id="L87" class="LineNr"> 87 </span>    insert c, curr
-<span id="L88" class="LineNr"> 88 </span>    <span class="Comment"># next iter</span>
-<span id="L89" class="LineNr"> 89 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L90" class="LineNr"> 90 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
-<span id="L91" class="LineNr"> 91 </span>    <span class="muControl">loop</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal idx, len
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *text, idx
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> insert c, curr
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Comment"># next iter</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L92" class="LineNr"> 92 </span>  <span class="Delimiter">}</span>
 <span id="L93" class="LineNr"> 93 </span>]
 <span id="L94" class="LineNr"> 94 </span>
@@ -157,24 +158,24 @@ if ('onhashchange' in window) {
 <span id="L96" class="LineNr"> 96 </span>  <span class="Constant">local-scope</span>
 <span id="L97" class="LineNr"> 97 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">3/height</span>
 <span id="L98" class="LineNr"> 98 </span>  run [
-<span id="L99" class="LineNr"> 99 </span>    e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">0/data</span>, <span class="Constant">2/left</span>, <span class="Constant">5/right</span>
-<span id="L100" class="LineNr">100 </span>    2:editor/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *e
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">0/data</span>, <span class="Constant">2/left</span>, <span class="Constant">5/right</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> 2:editor/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *e
 <span id="L101" class="LineNr">101 </span>  ]
 <span id="L102" class="LineNr">102 </span>  memory-should-contain [
-<span id="L103" class="LineNr">103 </span>    <span class="Comment"># 2 (data) &lt;- just the § sentinel</span>
-<span id="L104" class="LineNr">104 </span>    <span class="Comment"># 3 (top of screen) &lt;- the § sentinel</span>
-<span id="L105" class="LineNr">105 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># bottom-of-screen; null since text fits on screen</span>
-<span id="L106" class="LineNr">106 </span>    <span class="Comment"># 5 (before cursor) &lt;- the § sentinel</span>
-<span id="L107" class="LineNr">107 </span>   <span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># left</span>
-<span id="L108" class="LineNr">108 </span>   <span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># right  (inclusive)</span>
-<span id="L109" class="LineNr">109 </span>   <span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># bottom (not set until render)</span>
-<span id="L110" class="LineNr">110 </span>   <span class="Constant"> 9</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L111" class="LineNr">111 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Comment"># 2 (data) &lt;- just the § sentinel</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Comment"># 3 (top of screen) &lt;- the § sentinel</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># bottom-of-screen; null since text fits on screen</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Comment"># 5 (before cursor) &lt;- the § sentinel</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span><span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># left</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># right  (inclusive)</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span><span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># bottom (not set until render)</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span><span class="Constant"> 9</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column</span>
 <span id="L112" class="LineNr">112 </span>  ]
 <span id="L113" class="LineNr">113 </span>  screen-should-contain [
-<span id="L114" class="LineNr">114 </span>   <span class="Constant"> .     .</span>
-<span id="L115" class="LineNr">115 </span>   <span class="Constant"> .     .</span>
-<span id="L116" class="LineNr">116 </span>   <span class="Constant"> .     .</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L117" class="LineNr">117 </span>  ]
 <span id="L118" class="LineNr">118 </span>]
 <span id="L119" class="LineNr">119 </span>
@@ -202,78 +203,78 @@ if ('onhashchange' in window) {
 <span id="L141" class="LineNr">141 </span>  before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
 <span id="L142" class="LineNr">142 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
 <span id="L143" class="LineNr">143 </span>  <span class="Delimiter">{</span>
-<span id="L144" class="LineNr">144 </span><span class="Constant">    +next-character</span>
-<span id="L145" class="LineNr">145 </span>    <span class="muControl">break-unless</span> curr
-<span id="L146" class="LineNr">146 </span>    off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L147" class="LineNr">147 </span>    <span class="muControl">break-if</span> off-screen?
-<span id="L148" class="LineNr">148 </span>    <span class="Comment"># update editor.before-cursor</span>
-<span id="L149" class="LineNr">149 </span>    <span class="Comment"># Doing so at the start of each iteration ensures it stays one step behind</span>
-<span id="L150" class="LineNr">150 </span>    <span class="Comment"># the current character.</span>
-<span id="L151" class="LineNr">151 </span>    <span class="Delimiter">{</span>
-<span id="L152" class="LineNr">152 </span>      at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
-<span id="L153" class="LineNr">153 </span>      <span class="muControl">break-unless</span> at-cursor-row?
-<span id="L154" class="LineNr">154 </span>      at-cursor?:bool <span class="Special">&lt;-</span> equal column, cursor-column
-<span id="L155" class="LineNr">155 </span>      <span class="muControl">break-unless</span> at-cursor?
-<span id="L156" class="LineNr">156 </span>      before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L157" class="LineNr">157 </span>    <span class="Delimiter">}</span>
-<span id="L158" class="LineNr">158 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L159" class="LineNr">159 </span><span class="Constant">    &lt;character-c-received&gt;</span>
-<span id="L160" class="LineNr">160 </span>    <span class="Delimiter">{</span>
-<span id="L161" class="LineNr">161 </span>      <span class="Comment"># newline? move to left rather than 0</span>
-<span id="L162" class="LineNr">162 </span>      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L163" class="LineNr">163 </span>      <span class="muControl">break-unless</span> newline?
-<span id="L164" class="LineNr">164 </span>      <span class="Comment"># adjust cursor if necessary</span>
-<span id="L165" class="LineNr">165 </span>      <span class="Delimiter">{</span>
-<span id="L166" class="LineNr">166 </span>        at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
-<span id="L167" class="LineNr">167 </span>        <span class="muControl">break-unless</span> at-cursor-row?
-<span id="L168" class="LineNr">168 </span>        left-of-cursor?:bool <span class="Special">&lt;-</span> lesser-than column, cursor-column
-<span id="L169" class="LineNr">169 </span>        <span class="muControl">break-unless</span> left-of-cursor?
-<span id="L170" class="LineNr">170 </span>        cursor-column <span class="Special">&lt;-</span> copy column
-<span id="L171" class="LineNr">171 </span>        before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
-<span id="L172" class="LineNr">172 </span>      <span class="Delimiter">}</span>
-<span id="L173" class="LineNr">173 </span>      <span class="Comment"># clear rest of line in this window</span>
-<span id="L174" class="LineNr">174 </span>      <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
-<span id="L175" class="LineNr">175 </span>      <span class="Comment"># skip to next line</span>
-<span id="L176" class="LineNr">176 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L177" class="LineNr">177 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L178" class="LineNr">178 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L179" class="LineNr">179 </span>      curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L180" class="LineNr">180 </span>      <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L181" class="LineNr">181 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L182" class="LineNr">182 </span>    <span class="Delimiter">}</span>
-<span id="L183" class="LineNr">183 </span>    <span class="Delimiter">{</span>
-<span id="L184" class="LineNr">184 </span>      <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
-<span id="L185" class="LineNr">185 </span>      <span class="Comment"># room for clicking on the cursor after it.</span>
-<span id="L186" class="LineNr">186 </span>      at-right?:bool <span class="Special">&lt;-</span> equal column, right
-<span id="L187" class="LineNr">187 </span>      <span class="muControl">break-unless</span> at-right?
-<span id="L188" class="LineNr">188 </span>      <span class="Comment"># print wrap icon</span>
-<span id="L189" class="LineNr">189 </span>      wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
-<span id="L190" class="LineNr">190 </span>      print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
-<span id="L191" class="LineNr">191 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L192" class="LineNr">192 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L193" class="LineNr">193 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L194" class="LineNr">194 </span>      <span class="Comment"># don't increment curr</span>
-<span id="L195" class="LineNr">195 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L196" class="LineNr">196 </span>    <span class="Delimiter">}</span>
-<span id="L197" class="LineNr">197 </span>    print <a href='../081print.mu.html#L4'>screen</a>, c, color
-<span id="L198" class="LineNr">198 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L199" class="LineNr">199 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L200" class="LineNr">200 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L201" class="LineNr">201 </span>    <span class="muControl">loop</span>
+<span id="L144" class="LineNr">144 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> off-screen?
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Comment"># update editor.before-cursor</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Comment"># Doing so at the start of each iteration ensures it stays one step behind</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Comment"># the current character.</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor-row?
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor?:bool <span class="Special">&lt;-</span> equal column, cursor-column
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor?
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L159" class="LineNr">159 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;character-c-received&gt;</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># adjust cursor if necessary</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor-row?
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> left-of-cursor?:bool <span class="Special">&lt;-</span> lesser-than column, cursor-column
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> left-of-cursor?
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy column
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># skip to next line</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># room for clicking on the cursor after it.</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># don't increment curr</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L202" class="LineNr">202 </span>  <span class="Delimiter">}</span>
 <span id="L203" class="LineNr">203 </span>  <span class="Comment"># save first character off-screen</span>
 <span id="L204" class="LineNr">204 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom-of-screen:offset</span>, curr
 <span id="L205" class="LineNr">205 </span>  <span class="Comment"># is cursor to the right of the last line? move to end</span>
 <span id="L206" class="LineNr">206 </span>  <span class="Delimiter">{</span>
-<span id="L207" class="LineNr">207 </span>    at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
-<span id="L208" class="LineNr">208 </span>    cursor-outside-line?:bool <span class="Special">&lt;-</span> lesser-or-equal column, cursor-column
-<span id="L209" class="LineNr">209 </span>    before-cursor-on-same-line?:bool <span class="Special">&lt;-</span> and at-cursor-row?, cursor-outside-line?
-<span id="L210" class="LineNr">210 </span>    above-cursor-row?:bool <span class="Special">&lt;-</span> lesser-than row, cursor-row
-<span id="L211" class="LineNr">211 </span>    before-cursor?:bool <span class="Special">&lt;-</span> or before-cursor-on-same-line?, above-cursor-row?
-<span id="L212" class="LineNr">212 </span>    <span class="muControl">break-unless</span> before-cursor?
-<span id="L213" class="LineNr">213 </span>    cursor-row <span class="Special">&lt;-</span> copy row
-<span id="L214" class="LineNr">214 </span>    cursor-column <span class="Special">&lt;-</span> copy column
-<span id="L215" class="LineNr">215 </span>    before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> cursor-outside-line?:bool <span class="Special">&lt;-</span> lesser-or-equal column, cursor-column
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> before-cursor-on-same-line?:bool <span class="Special">&lt;-</span> and at-cursor-row?, cursor-outside-line?
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> above-cursor-row?:bool <span class="Special">&lt;-</span> lesser-than row, cursor-row
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> before-cursor?:bool <span class="Special">&lt;-</span> or before-cursor-on-same-line?, above-cursor-row?
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> before-cursor?
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> copy row
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy column
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
 <span id="L216" class="LineNr">216 </span>  <span class="Delimiter">}</span>
 <span id="L217" class="LineNr">217 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom:offset</span>, row
 <span id="L218" class="LineNr">218 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
@@ -287,9 +288,9 @@ if ('onhashchange' in window) {
 <span id="L226" class="LineNr">226 </span>  <span class="Constant">load-ingredients</span>
 <span id="L227" class="LineNr">227 </span>  <span class="Comment"># if it's the real screen, use the optimized primitive</span>
 <span id="L228" class="LineNr">228 </span>  <span class="Delimiter">{</span>
-<span id="L229" class="LineNr">229 </span>    <span class="muControl">break-if</span> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L230" class="LineNr">230 </span>    clear-display-from row, column, left, right
-<span id="L231" class="LineNr">231 </span>    <span class="muControl">return</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> clear-display-from row, column, left, right
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L232" class="LineNr">232 </span>  <span class="Delimiter">}</span>
 <span id="L233" class="LineNr">233 </span>  <span class="Comment"># if not, go the slower route</span>
 <span id="L234" class="LineNr">234 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
@@ -304,12 +305,12 @@ if ('onhashchange' in window) {
 <span id="L243" class="LineNr">243 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
 <span id="L244" class="LineNr">244 </span>  <a href='../081print.mu.html#L594'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L594'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
 <span id="L245" class="LineNr">245 </span>  <span class="Delimiter">{</span>
-<span id="L246" class="LineNr">246 </span>    at-bottom-of-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L247" class="LineNr">247 </span>    <span class="muControl">break-if</span> at-bottom-of-screen?
-<span id="L248" class="LineNr">248 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
-<span id="L249" class="LineNr">249 </span>    <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
-<span id="L250" class="LineNr">250 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L251" class="LineNr">251 </span>    <span class="muControl">loop</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> at-bottom-of-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-bottom-of-screen?
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L252" class="LineNr">252 </span>  <span class="Delimiter">}</span>
 <span id="L253" class="LineNr">253 </span>]
 <span id="L254" class="LineNr">254 </span>
@@ -320,13 +321,13 @@ if ('onhashchange' in window) {
 <span id="L259" class="LineNr">259 </span><span class="Constant">def]</span>
 <span id="L260" class="LineNr">260 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L261" class="LineNr">261 </span>  run [
-<span id="L262" class="LineNr">262 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L263" class="LineNr">263 </span>  ]
 <span id="L264" class="LineNr">264 </span>  screen-should-contain [
-<span id="L265" class="LineNr">265 </span>   <span class="Constant"> .     .</span>
-<span id="L266" class="LineNr">266 </span>   <span class="Constant"> .abc  .</span>
-<span id="L267" class="LineNr">267 </span>   <span class="Constant"> .def  .</span>
-<span id="L268" class="LineNr">268 </span>   <span class="Constant"> .     .</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc  .</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span><span class="Constant"> .def  .</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L269" class="LineNr">269 </span>  ]
 <span id="L270" class="LineNr">270 </span>]
 <span id="L271" class="LineNr">271 </span>
@@ -335,12 +336,12 @@ if ('onhashchange' in window) {
 <span id="L274" class="LineNr">274 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
 <span id="L275" class="LineNr">275 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
 <span id="L276" class="LineNr">276 </span>  run [
-<span id="L277" class="LineNr">277 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L278" class="LineNr">278 </span>  ]
 <span id="L279" class="LineNr">279 </span>  screen-should-contain [
-<span id="L280" class="LineNr">280 </span>   <span class="Constant"> .     .</span>
-<span id="L281" class="LineNr">281 </span>   <span class="Constant"> . abc .</span>
-<span id="L282" class="LineNr">282 </span>   <span class="Constant"> .     .</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span><span class="Constant"> . abc .</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L283" class="LineNr">283 </span>  ]
 <span id="L284" class="LineNr">284 </span>]
 <span id="L285" class="LineNr">285 </span>
@@ -351,13 +352,13 @@ if ('onhashchange' in window) {
 <span id="L290" class="LineNr">290 </span><span class="Constant">def]</span>
 <span id="L291" class="LineNr">291 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
 <span id="L292" class="LineNr">292 </span>  run [
-<span id="L293" class="LineNr">293 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L294" class="LineNr">294 </span>  ]
 <span id="L295" class="LineNr">295 </span>  screen-should-contain [
-<span id="L296" class="LineNr">296 </span>   <span class="Constant"> .     .</span>
-<span id="L297" class="LineNr">297 </span>   <span class="Constant"> . abc .</span>
-<span id="L298" class="LineNr">298 </span>   <span class="Constant"> . def .</span>
-<span id="L299" class="LineNr">299 </span>   <span class="Constant"> .     .</span>
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span><span class="Constant"> . abc .</span>
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span><span class="Constant"> . def .</span>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L300" class="LineNr">300 </span>  ]
 <span id="L301" class="LineNr">301 </span>]
 <span id="L302" class="LineNr">302 </span>
@@ -366,19 +367,19 @@ if ('onhashchange' in window) {
 <span id="L305" class="LineNr">305 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
 <span id="L306" class="LineNr">306 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc def]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L307" class="LineNr">307 </span>  run [
-<span id="L308" class="LineNr">308 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L309" class="LineNr">309 </span>  ]
 <span id="L310" class="LineNr">310 </span>  screen-should-contain [
-<span id="L311" class="LineNr">311 </span>   <span class="Constant"> .     .</span>
-<span id="L312" class="LineNr">312 </span>   <span class="Constant"> .abc ↩.</span>
-<span id="L313" class="LineNr">313 </span>   <span class="Constant"> .def  .</span>
-<span id="L314" class="LineNr">314 </span>   <span class="Constant"> .     .</span>
+<span id="L311" class="LineNr">311 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc ↩.</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span><span class="Constant"> .def  .</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L315" class="LineNr">315 </span>  ]
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-<span id="L317" class="LineNr">317 </span>   <span class="Constant"> .     .</span>
-<span id="L318" class="LineNr">318 </span>   <span class="Constant"> .    ↩.</span>
-<span id="L319" class="LineNr">319 </span>   <span class="Constant"> .     .</span>
-<span id="L320" class="LineNr">320 </span>   <span class="Constant"> .     .</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span><span class="Constant"> .    ↩.</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L321" class="LineNr">321 </span>  ]
 <span id="L322" class="LineNr">322 </span>]
 <span id="L323" class="LineNr">323 </span>
@@ -387,21 +388,21 @@ if ('onhashchange' in window) {
 <span id="L326" class="LineNr">326 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
 <span id="L327" class="LineNr">327 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abcde]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L328" class="LineNr">328 </span>  run [
-<span id="L329" class="LineNr">329 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L330" class="LineNr">330 </span>  ]
 <span id="L331" class="LineNr">331 </span>  <span class="Comment"># still wrap, even though the line would fit. We need room to click on the</span>
 <span id="L332" class="LineNr">332 </span>  <span class="Comment"># end of the line</span>
 <span id="L333" class="LineNr">333 </span>  screen-should-contain [
-<span id="L334" class="LineNr">334 </span>   <span class="Constant"> .     .</span>
-<span id="L335" class="LineNr">335 </span><span class="Constant">    .abcd↩.</span>
-<span id="L336" class="LineNr">336 </span>   <span class="Constant"> .e    .</span>
-<span id="L337" class="LineNr">337 </span>   <span class="Constant"> .     .</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L335" class="LineNr">335 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .abcd↩.</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span><span class="Constant"> .e    .</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L338" class="LineNr">338 </span>  ]
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-<span id="L340" class="LineNr">340 </span>   <span class="Constant"> .     .</span>
-<span id="L341" class="LineNr">341 </span>   <span class="Constant"> .    ↩.</span>
-<span id="L342" class="LineNr">342 </span>   <span class="Constant"> .     .</span>
-<span id="L343" class="LineNr">343 </span>   <span class="Constant"> .     .</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span><span class="Constant"> .    ↩.</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
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@@ -410,18 +411,18 @@ if ('onhashchange' in window) {
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 <span id="L350" class="LineNr">350 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L351" class="LineNr">351 </span>  run [
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-<span id="L353" class="LineNr">353 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L354" class="LineNr">354 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L354" class="LineNr">354 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L355" class="LineNr">355 </span>  ]
 <span id="L356" class="LineNr">356 </span>  screen-should-contain [
-<span id="L357" class="LineNr">357 </span>   <span class="Constant"> .     .</span>
-<span id="L358" class="LineNr">358 </span>   <span class="Constant"> .     .</span>
-<span id="L359" class="LineNr">359 </span>   <span class="Constant"> .     .</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L360" class="LineNr">360 </span>  ]
 <span id="L361" class="LineNr">361 </span>  memory-should-contain [
-<span id="L362" class="LineNr">362 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L363" class="LineNr">363 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
 <span id="L364" class="LineNr">364 </span>  ]
 <span id="L365" class="LineNr">365 </span>]
 <span id="L366" class="LineNr">366 </span>
@@ -435,28 +436,28 @@ if ('onhashchange' in window) {
 <span id="L374" class="LineNr">374 </span><span class="Constant">f]</span>
 <span id="L375" class="LineNr">375 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L376" class="LineNr">376 </span>  run [
-<span id="L377" class="LineNr">377 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L378" class="LineNr">378 </span>  ]
 <span id="L379" class="LineNr">379 </span>  screen-should-contain [
-<span id="L380" class="LineNr">380 </span>   <span class="Constant"> .     .</span>
-<span id="L381" class="LineNr">381 </span>   <span class="Constant"> .abc  .</span>
-<span id="L382" class="LineNr">382 </span>   <span class="Constant"> .# de .</span>
-<span id="L383" class="LineNr">383 </span>   <span class="Constant"> .f    .</span>
-<span id="L384" class="LineNr">384 </span>   <span class="Constant"> .     .</span>
+<span id="L380" class="LineNr">380 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc  .</span>
+<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span><span class="Constant"> .# de .</span>
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span><span class="Constant"> .f    .</span>
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L385" class="LineNr">385 </span>  ]
 <span id="L386" class="LineNr">386 </span>  screen-should-contain-in-color <span class="Constant">12/lightblue</span>, [
-<span id="L387" class="LineNr">387 </span>   <span class="Constant"> .     .</span>
-<span id="L388" class="LineNr">388 </span>   <span class="Constant"> .     .</span>
-<span id="L389" class="LineNr">389 </span>   <span class="Constant"> .# de .</span>
-<span id="L390" class="LineNr">390 </span>   <span class="Constant"> .     .</span>
-<span id="L391" class="LineNr">391 </span>   <span class="Constant"> .     .</span>
+<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span><span class="Constant"> .# de .</span>
+<span id="L390" class="LineNr">390 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L392" class="LineNr">392 </span>  ]
 <span id="L393" class="LineNr">393 </span>  screen-should-contain-in-color <span class="Constant">7/white</span>, [
-<span id="L394" class="LineNr">394 </span>   <span class="Constant"> .     .</span>
-<span id="L395" class="LineNr">395 </span>   <span class="Constant"> .abc  .</span>
-<span id="L396" class="LineNr">396 </span>   <span class="Constant"> .     .</span>
-<span id="L397" class="LineNr">397 </span>   <span class="Constant"> .f    .</span>
-<span id="L398" class="LineNr">398 </span>   <span class="Constant"> .     .</span>
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc  .</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span><span class="Constant"> .f    .</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L399" class="LineNr">399 </span>  ]
 <span id="L400" class="LineNr">400 </span>]
 <span id="L401" class="LineNr">401 </span>
@@ -471,39 +472,39 @@ if ('onhashchange' in window) {
 <span id="L410" class="LineNr">410 </span>  color-is-white?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">7/white</span>
 <span id="L411" class="LineNr">411 </span>  <span class="Comment"># if color is white and next character is '#', switch color to blue</span>
 <span id="L412" class="LineNr">412 </span>  <span class="Delimiter">{</span>
-<span id="L413" class="LineNr">413 </span>    <span class="muControl">break-unless</span> color-is-white?
-<span id="L414" class="LineNr">414 </span>    starting-comment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">35/#</span>
-<span id="L415" class="LineNr">415 </span>    <span class="muControl">break-unless</span> starting-comment?
-<span id="L416" class="LineNr">416 </span>    trace<span class="Constant"> 90</span>, <span class="Constant">[app]</span>, <span class="Constant">[switch color back to blue]</span>
-<span id="L417" class="LineNr">417 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">12/lightblue</span>
-<span id="L418" class="LineNr">418 </span>    <span class="muControl">jump</span> <span class="Constant">+exit</span>
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-white?
+<span id="L414" class="LineNr">414 </span>  <span class="Conceal">¦</span> starting-comment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">35/#</span>
+<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> starting-comment?
+<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 90</span>, <span class="Constant">[app]</span>, <span class="Constant">[switch color back to blue]</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">12/lightblue</span>
+<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+exit</span>
 <span id="L419" class="LineNr">419 </span>  <span class="Delimiter">}</span>
 <span id="L420" class="LineNr">420 </span>  <span class="Comment"># if color is blue and next character is newline, switch color to white</span>
 <span id="L421" class="LineNr">421 </span>  <span class="Delimiter">{</span>
-<span id="L422" class="LineNr">422 </span>    color-is-blue?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">12/lightblue</span>
-<span id="L423" class="LineNr">423 </span>    <span class="muControl">break-unless</span> color-is-blue?
-<span id="L424" class="LineNr">424 </span>    ending-comment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L425" class="LineNr">425 </span>    <span class="muControl">break-unless</span> ending-comment?
-<span id="L426" class="LineNr">426 </span>    trace<span class="Constant"> 90</span>, <span class="Constant">[app]</span>, <span class="Constant">[switch color back to white]</span>
-<span id="L427" class="LineNr">427 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
-<span id="L428" class="LineNr">428 </span>    <span class="muControl">jump</span> <span class="Constant">+exit</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> color-is-blue?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">12/lightblue</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-blue?
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span> ending-comment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> ending-comment?
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 90</span>, <span class="Constant">[app]</span>, <span class="Constant">[switch color back to white]</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+exit</span>
 <span id="L429" class="LineNr">429 </span>  <span class="Delimiter">}</span>
 <span id="L430" class="LineNr">430 </span>  <span class="Comment"># if color is white (no comments) and next character is '&lt;', switch color to red</span>
 <span id="L431" class="LineNr">431 </span>  <span class="Delimiter">{</span>
-<span id="L432" class="LineNr">432 </span>    <span class="muControl">break-unless</span> color-is-white?
-<span id="L433" class="LineNr">433 </span>    starting-assignment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">60/&lt;</span>
-<span id="L434" class="LineNr">434 </span>    <span class="muControl">break-unless</span> starting-assignment?
-<span id="L435" class="LineNr">435 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">1/red</span>
-<span id="L436" class="LineNr">436 </span>    <span class="muControl">jump</span> <span class="Constant">+exit</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-white?
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> starting-assignment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">60/&lt;</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> starting-assignment?
+<span id="L435" class="LineNr">435 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">1/red</span>
+<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+exit</span>
 <span id="L437" class="LineNr">437 </span>  <span class="Delimiter">}</span>
 <span id="L438" class="LineNr">438 </span>  <span class="Comment"># if color is red and next character is space, switch color to white</span>
 <span id="L439" class="LineNr">439 </span>  <span class="Delimiter">{</span>
-<span id="L440" class="LineNr">440 </span>    color-is-red?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">1/red</span>
-<span id="L441" class="LineNr">441 </span>    <span class="muControl">break-unless</span> color-is-red?
-<span id="L442" class="LineNr">442 </span>    ending-assignment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">32/space</span>
-<span id="L443" class="LineNr">443 </span>    <span class="muControl">break-unless</span> ending-assignment?
-<span id="L444" class="LineNr">444 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
-<span id="L445" class="LineNr">445 </span>    <span class="muControl">jump</span> <span class="Constant">+exit</span>
+<span id="L440" class="LineNr">440 </span>  <span class="Conceal">¦</span> color-is-red?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">1/red</span>
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-red?
+<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> ending-assignment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">32/space</span>
+<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> ending-assignment?
+<span id="L444" class="LineNr">444 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+exit</span>
 <span id="L446" class="LineNr">446 </span>  <span class="Delimiter">}</span>
 <span id="L447" class="LineNr">447 </span>  <span class="Comment"># otherwise no change</span>
 <span id="L448" class="LineNr">448 </span><span class="Constant">  +exit</span>
@@ -518,21 +519,21 @@ if ('onhashchange' in window) {
 <span id="L457" class="LineNr">457 </span><span class="Constant">f]</span>
 <span id="L458" class="LineNr">458 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">8/right</span>
 <span id="L459" class="LineNr">459 </span>  run [
-<span id="L460" class="LineNr">460 </span>    <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L461" class="LineNr">461 </span>  ]
 <span id="L462" class="LineNr">462 </span>  screen-should-contain [
-<span id="L463" class="LineNr">463 </span>   <span class="Constant"> .        .</span>
-<span id="L464" class="LineNr">464 </span>   <span class="Constant"> .abc     .</span>
-<span id="L465" class="LineNr">465 </span>   <span class="Constant"> .d &lt;- e  .</span>
-<span id="L466" class="LineNr">466 </span>   <span class="Constant"> .f       .</span>
-<span id="L467" class="LineNr">467 </span>   <span class="Constant"> .        .</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc     .</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span><span class="Constant"> .d &lt;- e  .</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span><span class="Constant"> .f       .</span>
+<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
 <span id="L468" class="LineNr">468 </span>  ]
 <span id="L469" class="LineNr">469 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
-<span id="L470" class="LineNr">470 </span>   <span class="Constant"> .        .</span>
-<span id="L471" class="LineNr">471 </span>   <span class="Constant"> .        .</span>
-<span id="L472" class="LineNr">472 </span>   <span class="Constant"> .  &lt;-    .</span>
-<span id="L473" class="LineNr">473 </span>   <span class="Constant"> .        .</span>
-<span id="L474" class="LineNr">474 </span>   <span class="Constant"> .        .</span>
+<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
+<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
+<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span><span class="Constant"> .  &lt;-    .</span>
+<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
 <span id="L475" class="LineNr">475 </span>  ]
 <span id="L476" class="LineNr">476 </span>]
 </pre>
diff --git a/html/edit/002-typing.mu.html b/html/edit/002-typing.mu.html
index 71244ddb..3c8b89ae 100644
--- a/html/edit/002-typing.mu.html
+++ b/html/edit/002-typing.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
-.muData { color: #ffff00; }
+.Conceal { color: #4e4e4e; }
+.Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -76,32 +77,32 @@ if ('onhashchange' in window) {
 <span id="L15" class="LineNr">  15 </span>  <span class="Constant">local-scope</span>
 <span id="L16" class="LineNr">  16 </span>  <span class="Constant">load-ingredients</span>
 <span id="L17" class="LineNr">  17 </span>  <span class="Delimiter">{</span>
-<span id="L18" class="LineNr">  18 </span>    <span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
-<span id="L19" class="LineNr">  19 </span><span class="Constant">    +next-event</span>
-<span id="L20" class="LineNr">  20 </span>    cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
-<span id="L21" class="LineNr">  21 </span>    cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
-<span id="L22" class="LineNr">  22 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
-<span id="L23" class="LineNr">  23 </span>    e:<a href='../084console.mu.html#L4'>event</a>, found?:bool, quit?:bool, <a href='../084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='../084console.mu.html#L35'>read-event</a> <a href='../084console.mu.html#L23'>console</a>
-<span id="L24" class="LineNr">  24 </span>    <span class="muControl">loop-unless</span> found?
-<span id="L25" class="LineNr">  25 </span>    <span class="muControl">break-if</span> quit?  <span class="Comment"># only in tests</span>
-<span id="L26" class="LineNr">  26 </span>    trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
-<span id="L27" class="LineNr">  27 </span>    <span class="Comment"># 'touch' event</span>
-<span id="L28" class="LineNr">  28 </span>    t:<a href='../084console.mu.html#L12'>touch-event</a>, is-touch?:bool <span class="Special">&lt;-</span> maybe-convert e, <span class="Constant">touch:variant</span>
-<span id="L29" class="LineNr">  29 </span>    <span class="Delimiter">{</span>
-<span id="L30" class="LineNr">  30 </span>      <span class="muControl">break-unless</span> is-touch?
-<span id="L31" class="LineNr">  31 </span>      <a href='002-typing.mu.html#L48'>move-cursor-in-editor</a> <a href='../081print.mu.html#L4'>screen</a>, editor, t
-<span id="L32" class="LineNr">  32 </span>      <span class="muControl">loop</span> <span class="Constant">+next-event</span>
-<span id="L33" class="LineNr">  33 </span>    <span class="Delimiter">}</span>
-<span id="L34" class="LineNr">  34 </span>    <span class="Comment"># keyboard events</span>
-<span id="L35" class="LineNr">  35 </span>    <span class="Delimiter">{</span>
-<span id="L36" class="LineNr">  36 </span>      <span class="muControl">break-if</span> is-touch?
-<span id="L37" class="LineNr">  37 </span>      go-render?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L164'>handle-keyboard-event</a> <a href='../081print.mu.html#L4'>screen</a>, editor, e
-<span id="L38" class="LineNr">  38 </span>      <span class="Delimiter">{</span>
-<span id="L39" class="LineNr">  39 </span>        <span class="muControl">break-unless</span> go-render?
-<span id="L40" class="LineNr">  40 </span>        <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, editor
-<span id="L41" class="LineNr">  41 </span>      <span class="Delimiter">}</span>
-<span id="L42" class="LineNr">  42 </span>    <span class="Delimiter">}</span>
-<span id="L43" class="LineNr">  43 </span>    <span class="muControl">loop</span>
+<span id="L18" class="LineNr">  18 </span>  <span class="Conceal">¦</span> <span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
+<span id="L19" class="LineNr">  19 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-event</span>
+<span id="L20" class="LineNr">  20 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
+<span id="L21" class="LineNr">  21 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
+<span id="L22" class="LineNr">  22 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
+<span id="L23" class="LineNr">  23 </span>  <span class="Conceal">¦</span> e:<a href='../084console.mu.html#L4'>event</a>, found?:bool, quit?:bool, <a href='../084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='../084console.mu.html#L35'>read-event</a> <a href='../084console.mu.html#L23'>console</a>
+<span id="L24" class="LineNr">  24 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> found?
+<span id="L25" class="LineNr">  25 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> quit?  <span class="Comment"># only in tests</span>
+<span id="L26" class="LineNr">  26 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
+<span id="L27" class="LineNr">  27 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'touch' event</span>
+<span id="L28" class="LineNr">  28 </span>  <span class="Conceal">¦</span> t:<a href='../084console.mu.html#L12'>touch-event</a>, is-touch?:bool <span class="Special">&lt;-</span> maybe-convert e, <span class="Constant">touch:variant</span>
+<span id="L29" class="LineNr">  29 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L30" class="LineNr">  30 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-touch?
+<span id="L31" class="LineNr">  31 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='002-typing.mu.html#L48'>move-cursor-in-editor</a> <a href='../081print.mu.html#L4'>screen</a>, editor, t
+<span id="L32" class="LineNr">  32 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L33" class="LineNr">  33 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L34" class="LineNr">  34 </span>  <span class="Conceal">¦</span> <span class="Comment"># keyboard events</span>
+<span id="L35" class="LineNr">  35 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L36" class="LineNr">  36 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> is-touch?
+<span id="L37" class="LineNr">  37 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> go-render?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L164'>handle-keyboard-event</a> <a href='../081print.mu.html#L4'>screen</a>, editor, e
+<span id="L38" class="LineNr">  38 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L39" class="LineNr">  39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> go-render?
+<span id="L40" class="LineNr">  40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, editor
+<span id="L41" class="LineNr">  41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L42" class="LineNr">  42 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L43" class="LineNr">  43 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L44" class="LineNr">  44 </span>  <span class="Delimiter">}</span>
 <span id="L45" class="LineNr">  45 </span>]
 <span id="L46" class="LineNr">  46 </span>
@@ -150,73 +151,73 @@ if ('onhashchange' in window) {
 <span id="L89" class="LineNr">  89 </span>  cursor-column:num <span class="Special">&lt;-</span> copy target-column
 <span id="L90" class="LineNr">  90 </span>  before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
 <span id="L91" class="LineNr">  91 </span>  <span class="Delimiter">{</span>
-<span id="L92" class="LineNr">  92 </span><span class="Constant">    +next-character</span>
-<span id="L93" class="LineNr">  93 </span>    <span class="muControl">break-unless</span> curr
-<span id="L94" class="LineNr">  94 </span>    off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L95" class="LineNr">  95 </span>    <span class="muControl">break-if</span> off-screen?
-<span id="L96" class="LineNr">  96 </span>    <span class="Comment"># update editor.before-cursor</span>
-<span id="L97" class="LineNr">  97 </span>    <span class="Comment"># Doing so at the start of each iteration ensures it stays one step behind</span>
-<span id="L98" class="LineNr">  98 </span>    <span class="Comment"># the current character.</span>
-<span id="L99" class="LineNr">  99 </span>    <span class="Delimiter">{</span>
-<span id="L100" class="LineNr"> 100 </span>      at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
-<span id="L101" class="LineNr"> 101 </span>      <span class="muControl">break-unless</span> at-cursor-row?
-<span id="L102" class="LineNr"> 102 </span>      at-cursor?:bool <span class="Special">&lt;-</span> equal column, cursor-column
-<span id="L103" class="LineNr"> 103 </span>      <span class="muControl">break-unless</span> at-cursor?
-<span id="L104" class="LineNr"> 104 </span>      before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L105" class="LineNr"> 105 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L106" class="LineNr"> 106 </span>    <span class="Delimiter">}</span>
-<span id="L107" class="LineNr"> 107 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L108" class="LineNr"> 108 </span>    <span class="Delimiter">{</span>
-<span id="L109" class="LineNr"> 109 </span>      <span class="Comment"># newline? move to left rather than 0</span>
-<span id="L110" class="LineNr"> 110 </span>      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L111" class="LineNr"> 111 </span>      <span class="muControl">break-unless</span> newline?
-<span id="L112" class="LineNr"> 112 </span>      <span class="Comment"># adjust cursor if necessary</span>
-<span id="L113" class="LineNr"> 113 </span>      <span class="Delimiter">{</span>
-<span id="L114" class="LineNr"> 114 </span>        at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
-<span id="L115" class="LineNr"> 115 </span>        <span class="muControl">break-unless</span> at-cursor-row?
-<span id="L116" class="LineNr"> 116 </span>        left-of-cursor?:bool <span class="Special">&lt;-</span> lesser-than column, cursor-column
-<span id="L117" class="LineNr"> 117 </span>        <span class="muControl">break-unless</span> left-of-cursor?
-<span id="L118" class="LineNr"> 118 </span>        cursor-column <span class="Special">&lt;-</span> copy column
-<span id="L119" class="LineNr"> 119 </span>        *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L120" class="LineNr"> 120 </span>        before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L121" class="LineNr"> 121 </span>        *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L122" class="LineNr"> 122 </span>      <span class="Delimiter">}</span>
-<span id="L123" class="LineNr"> 123 </span>      <span class="Comment"># skip to next line</span>
-<span id="L124" class="LineNr"> 124 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L125" class="LineNr"> 125 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L126" class="LineNr"> 126 </span>      curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L127" class="LineNr"> 127 </span>      <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L128" class="LineNr"> 128 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L129" class="LineNr"> 129 </span>    <span class="Delimiter">}</span>
-<span id="L130" class="LineNr"> 130 </span>    <span class="Delimiter">{</span>
-<span id="L131" class="LineNr"> 131 </span>      <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
-<span id="L132" class="LineNr"> 132 </span>      <span class="Comment"># room for clicking on the cursor after it.</span>
-<span id="L133" class="LineNr"> 133 </span>      at-right?:bool <span class="Special">&lt;-</span> equal column, right
-<span id="L134" class="LineNr"> 134 </span>      <span class="muControl">break-unless</span> at-right?
-<span id="L135" class="LineNr"> 135 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L136" class="LineNr"> 136 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L137" class="LineNr"> 137 </span>      <span class="Comment"># don't increment curr/prev</span>
-<span id="L138" class="LineNr"> 138 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L139" class="LineNr"> 139 </span>    <span class="Delimiter">}</span>
-<span id="L140" class="LineNr"> 140 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L141" class="LineNr"> 141 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L142" class="LineNr"> 142 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L143" class="LineNr"> 143 </span>    <span class="muControl">loop</span>
+<span id="L92" class="LineNr">  92 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L93" class="LineNr">  93 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L94" class="LineNr">  94 </span>  <span class="Conceal">¦</span> off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L95" class="LineNr">  95 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> off-screen?
+<span id="L96" class="LineNr">  96 </span>  <span class="Conceal">¦</span> <span class="Comment"># update editor.before-cursor</span>
+<span id="L97" class="LineNr">  97 </span>  <span class="Conceal">¦</span> <span class="Comment"># Doing so at the start of each iteration ensures it stays one step behind</span>
+<span id="L98" class="LineNr">  98 </span>  <span class="Conceal">¦</span> <span class="Comment"># the current character.</span>
+<span id="L99" class="LineNr">  99 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L100" class="LineNr"> 100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
+<span id="L101" class="LineNr"> 101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor-row?
+<span id="L102" class="LineNr"> 102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor?:bool <span class="Special">&lt;-</span> equal column, cursor-column
+<span id="L103" class="LineNr"> 103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor?
+<span id="L104" class="LineNr"> 104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L105" class="LineNr"> 105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L106" class="LineNr"> 106 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L107" class="LineNr"> 107 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L108" class="LineNr"> 108 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L109" class="LineNr"> 109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
+<span id="L110" class="LineNr"> 110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L111" class="LineNr"> 111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L112" class="LineNr"> 112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># adjust cursor if necessary</span>
+<span id="L113" class="LineNr"> 113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L114" class="LineNr"> 114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
+<span id="L115" class="LineNr"> 115 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor-row?
+<span id="L116" class="LineNr"> 116 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> left-of-cursor?:bool <span class="Special">&lt;-</span> lesser-than column, cursor-column
+<span id="L117" class="LineNr"> 117 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> left-of-cursor?
+<span id="L118" class="LineNr"> 118 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy column
+<span id="L119" class="LineNr"> 119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L120" class="LineNr"> 120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L121" class="LineNr"> 121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L122" class="LineNr"> 122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L123" class="LineNr"> 123 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># skip to next line</span>
+<span id="L124" class="LineNr"> 124 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L125" class="LineNr"> 125 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L126" class="LineNr"> 126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L127" class="LineNr"> 127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L128" class="LineNr"> 128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L129" class="LineNr"> 129 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L130" class="LineNr"> 130 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L131" class="LineNr"> 131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
+<span id="L132" class="LineNr"> 132 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># room for clicking on the cursor after it.</span>
+<span id="L133" class="LineNr"> 133 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
+<span id="L134" class="LineNr"> 134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
+<span id="L135" class="LineNr"> 135 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L136" class="LineNr"> 136 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L137" class="LineNr"> 137 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># don't increment curr/prev</span>
+<span id="L138" class="LineNr"> 138 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L139" class="LineNr"> 139 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L140" class="LineNr"> 140 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L141" class="LineNr"> 141 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L142" class="LineNr"> 142 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L143" class="LineNr"> 143 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L144" class="LineNr"> 144 </span>  <span class="Delimiter">}</span>
 <span id="L145" class="LineNr"> 145 </span>  <span class="Comment"># is cursor to the right of the last line? move to end</span>
 <span id="L146" class="LineNr"> 146 </span>  <span class="Delimiter">{</span>
-<span id="L147" class="LineNr"> 147 </span>    at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
-<span id="L148" class="LineNr"> 148 </span>    cursor-outside-line?:bool <span class="Special">&lt;-</span> lesser-or-equal column, cursor-column
-<span id="L149" class="LineNr"> 149 </span>    before-cursor-on-same-line?:bool <span class="Special">&lt;-</span> and at-cursor-row?, cursor-outside-line?
-<span id="L150" class="LineNr"> 150 </span>    above-cursor-row?:bool <span class="Special">&lt;-</span> lesser-than row, cursor-row
-<span id="L151" class="LineNr"> 151 </span>    before-cursor?:bool <span class="Special">&lt;-</span> or before-cursor-on-same-line?, above-cursor-row?
-<span id="L152" class="LineNr"> 152 </span>    <span class="muControl">break-unless</span> before-cursor?
-<span id="L153" class="LineNr"> 153 </span>    cursor-row <span class="Special">&lt;-</span> copy row
-<span id="L154" class="LineNr"> 154 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L155" class="LineNr"> 155 </span>    cursor-column <span class="Special">&lt;-</span> copy column
-<span id="L156" class="LineNr"> 156 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L157" class="LineNr"> 157 </span>    before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L158" class="LineNr"> 158 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L147" class="LineNr"> 147 </span>  <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
+<span id="L148" class="LineNr"> 148 </span>  <span class="Conceal">¦</span> cursor-outside-line?:bool <span class="Special">&lt;-</span> lesser-or-equal column, cursor-column
+<span id="L149" class="LineNr"> 149 </span>  <span class="Conceal">¦</span> before-cursor-on-same-line?:bool <span class="Special">&lt;-</span> and at-cursor-row?, cursor-outside-line?
+<span id="L150" class="LineNr"> 150 </span>  <span class="Conceal">¦</span> above-cursor-row?:bool <span class="Special">&lt;-</span> lesser-than row, cursor-row
+<span id="L151" class="LineNr"> 151 </span>  <span class="Conceal">¦</span> before-cursor?:bool <span class="Special">&lt;-</span> or before-cursor-on-same-line?, above-cursor-row?
+<span id="L152" class="LineNr"> 152 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> before-cursor?
+<span id="L153" class="LineNr"> 153 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> copy row
+<span id="L154" class="LineNr"> 154 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L155" class="LineNr"> 155 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy column
+<span id="L156" class="LineNr"> 156 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L157" class="LineNr"> 157 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L158" class="LineNr"> 158 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
 <span id="L159" class="LineNr"> 159 </span>  <span class="Delimiter">}</span>
 <span id="L160" class="LineNr"> 160 </span>]
 <span id="L161" class="LineNr"> 161 </span>
@@ -237,19 +238,19 @@ if ('onhashchange' in window) {
 <span id="L176" class="LineNr"> 176 </span>  save-column:num <span class="Special">&lt;-</span> copy cursor-column
 <span id="L177" class="LineNr"> 177 </span>  <span class="Comment"># character</span>
 <span id="L178" class="LineNr"> 178 </span>  <span class="Delimiter">{</span>
-<span id="L179" class="LineNr"> 179 </span>    c:char, is-unicode?:bool <span class="Special">&lt;-</span> maybe-convert e, <span class="Constant">text:variant</span>
-<span id="L180" class="LineNr"> 180 </span>    <span class="muControl">break-unless</span> is-unicode?
-<span id="L181" class="LineNr"> 181 </span>    trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[handle-keyboard-event: special character]</span>
-<span id="L182" class="LineNr"> 182 </span>    <span class="Comment"># exceptions for special characters go here</span>
-<span id="L183" class="LineNr"> 183 </span><span class="Constant">    <a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span>
-<span id="L184" class="LineNr"> 184 </span>    <span class="Comment"># ignore any other special characters</span>
-<span id="L185" class="LineNr"> 185 </span>    regular-character?:bool <span class="Special">&lt;-</span> greater-or-equal c, <span class="Constant">32/space</span>
-<span id="L186" class="LineNr"> 186 </span>    <span class="muControl">return-unless</span> regular-character?, <span class="Constant">0/don't-render</span>
-<span id="L187" class="LineNr"> 187 </span>    <span class="Comment"># otherwise type it in</span>
-<span id="L188" class="LineNr"> 188 </span><span class="Constant">    &lt;insert-character-begin&gt;</span>
-<span id="L189" class="LineNr"> 189 </span>    go-render? <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, c, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L190" class="LineNr"> 190 </span><span class="Constant">    &lt;insert-character-end&gt;</span>
-<span id="L191" class="LineNr"> 191 </span>    <span class="muControl">return</span>
+<span id="L179" class="LineNr"> 179 </span>  <span class="Conceal">¦</span> c:char, is-unicode?:bool <span class="Special">&lt;-</span> maybe-convert e, <span class="Constant">text:variant</span>
+<span id="L180" class="LineNr"> 180 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-unicode?
+<span id="L181" class="LineNr"> 181 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[handle-keyboard-event: special character]</span>
+<span id="L182" class="LineNr"> 182 </span>  <span class="Conceal">¦</span> <span class="Comment"># exceptions for special characters go here</span>
+<span id="L183" class="LineNr"> 183 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span>
+<span id="L184" class="LineNr"> 184 </span>  <span class="Conceal">¦</span> <span class="Comment"># ignore any other special characters</span>
+<span id="L185" class="LineNr"> 185 </span>  <span class="Conceal">¦</span> regular-character?:bool <span class="Special">&lt;-</span> greater-or-equal c, <span class="Constant">32/space</span>
+<span id="L186" class="LineNr"> 186 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> regular-character?, <span class="Constant">0/don't-render</span>
+<span id="L187" class="LineNr"> 187 </span>  <span class="Conceal">¦</span> <span class="Comment"># otherwise type it in</span>
+<span id="L188" class="LineNr"> 188 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;insert-character-begin&gt;</span>
+<span id="L189" class="LineNr"> 189 </span>  <span class="Conceal">¦</span> go-render? <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, c, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L190" class="LineNr"> 190 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;insert-character-end&gt;</span>
+<span id="L191" class="LineNr"> 191 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L192" class="LineNr"> 192 </span>  <span class="Delimiter">}</span>
 <span id="L193" class="LineNr"> 193 </span>  <span class="Comment"># special key to modify the text or move the cursor</span>
 <span id="L194" class="LineNr"> 194 </span>  k:num, is-keycode?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">keycode:variant</span>
@@ -281,41 +282,41 @@ if ('onhashchange' in window) {
 <span id="L220" class="LineNr"> 220 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
 <span id="L221" class="LineNr"> 221 </span>  <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
 <span id="L222" class="LineNr"> 222 </span>  <span class="Delimiter">{</span>
-<span id="L223" class="LineNr"> 223 </span>    <span class="Comment"># at end of all text? no need to scroll? just print the character and leave</span>
-<span id="L224" class="LineNr"> 224 </span>    at-end?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L29'>next</a>, <span class="Constant">0/null</span>
-<span id="L225" class="LineNr"> 225 </span>    <span class="muControl">break-unless</span> at-end?
-<span id="L226" class="LineNr"> 226 </span>    bottom:num <span class="Special">&lt;-</span> subtract <a href='../081print.mu.html#L594'>screen-height</a>,<span class="Constant"> 1</span>
-<span id="L227" class="LineNr"> 227 </span>    at-bottom?:bool <span class="Special">&lt;-</span> equal save-row, bottom
-<span id="L228" class="LineNr"> 228 </span>    at-right?:bool <span class="Special">&lt;-</span> equal save-column, right
-<span id="L229" class="LineNr"> 229 </span>    overflow?:bool <span class="Special">&lt;-</span> and at-bottom?, at-right?
-<span id="L230" class="LineNr"> 230 </span>    <span class="muControl">break-if</span> overflow?
-<span id="L231" class="LineNr"> 231 </span>    <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, save-row, save-column
-<span id="L232" class="LineNr"> 232 </span>    print <a href='../081print.mu.html#L4'>screen</a>, c
-<span id="L233" class="LineNr"> 233 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L223" class="LineNr"> 223 </span>  <span class="Conceal">¦</span> <span class="Comment"># at end of all text? no need to scroll? just print the character and leave</span>
+<span id="L224" class="LineNr"> 224 </span>  <span class="Conceal">¦</span> at-end?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L29'>next</a>, <span class="Constant">0/null</span>
+<span id="L225" class="LineNr"> 225 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end?
+<span id="L226" class="LineNr"> 226 </span>  <span class="Conceal">¦</span> bottom:num <span class="Special">&lt;-</span> subtract <a href='../081print.mu.html#L594'>screen-height</a>,<span class="Constant"> 1</span>
+<span id="L227" class="LineNr"> 227 </span>  <span class="Conceal">¦</span> at-bottom?:bool <span class="Special">&lt;-</span> equal save-row, bottom
+<span id="L228" class="LineNr"> 228 </span>  <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal save-column, right
+<span id="L229" class="LineNr"> 229 </span>  <span class="Conceal">¦</span> overflow?:bool <span class="Special">&lt;-</span> and at-bottom?, at-right?
+<span id="L230" class="LineNr"> 230 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> overflow?
+<span id="L231" class="LineNr"> 231 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, save-row, save-column
+<span id="L232" class="LineNr"> 232 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c
+<span id="L233" class="LineNr"> 233 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L234" class="LineNr"> 234 </span>  <span class="Delimiter">}</span>
 <span id="L235" class="LineNr"> 235 </span>  <span class="Delimiter">{</span>
-<span id="L236" class="LineNr"> 236 </span>    <span class="Comment"># not at right margin? print the character and rest of line</span>
-<span id="L237" class="LineNr"> 237 </span>    <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>
-<span id="L238" class="LineNr"> 238 </span>    at-right?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, <a href='../081print.mu.html#L581'>screen-width</a>
-<span id="L239" class="LineNr"> 239 </span>    <span class="muControl">break-if</span> at-right?
-<span id="L240" class="LineNr"> 240 </span>    curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy before-cursor
-<span id="L241" class="LineNr"> 241 </span>    <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, save-row, save-column
-<span id="L242" class="LineNr"> 242 </span>    curr-column:num <span class="Special">&lt;-</span> copy save-column
-<span id="L243" class="LineNr"> 243 </span>    <span class="Delimiter">{</span>
-<span id="L244" class="LineNr"> 244 </span>      <span class="Comment"># hit right margin? give up and let caller render</span>
-<span id="L245" class="LineNr"> 245 </span>      at-right?:bool <span class="Special">&lt;-</span> greater-than curr-column, right
-<span id="L246" class="LineNr"> 246 </span>      <span class="muControl">return-if</span> at-right?, <span class="Constant">1/go-render</span>
-<span id="L247" class="LineNr"> 247 </span>      <span class="muControl">break-unless</span> curr
-<span id="L248" class="LineNr"> 248 </span>      <span class="Comment"># newline? done.</span>
-<span id="L249" class="LineNr"> 249 </span>      currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L250" class="LineNr"> 250 </span>      at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
-<span id="L251" class="LineNr"> 251 </span>      <span class="muControl">break-if</span> at-newline?
-<span id="L252" class="LineNr"> 252 </span>      print <a href='../081print.mu.html#L4'>screen</a>, currc
-<span id="L253" class="LineNr"> 253 </span>      curr-column <span class="Special">&lt;-</span> add curr-column,<span class="Constant"> 1</span>
-<span id="L254" class="LineNr"> 254 </span>      curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L255" class="LineNr"> 255 </span>      <span class="muControl">loop</span>
-<span id="L256" class="LineNr"> 256 </span>    <span class="Delimiter">}</span>
-<span id="L257" class="LineNr"> 257 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L236" class="LineNr"> 236 </span>  <span class="Conceal">¦</span> <span class="Comment"># not at right margin? print the character and rest of line</span>
+<span id="L237" class="LineNr"> 237 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>
+<span id="L238" class="LineNr"> 238 </span>  <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, <a href='../081print.mu.html#L581'>screen-width</a>
+<span id="L239" class="LineNr"> 239 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-right?
+<span id="L240" class="LineNr"> 240 </span>  <span class="Conceal">¦</span> curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy before-cursor
+<span id="L241" class="LineNr"> 241 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, save-row, save-column
+<span id="L242" class="LineNr"> 242 </span>  <span class="Conceal">¦</span> curr-column:num <span class="Special">&lt;-</span> copy save-column
+<span id="L243" class="LineNr"> 243 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L244" class="LineNr"> 244 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># hit right margin? give up and let caller render</span>
+<span id="L245" class="LineNr"> 245 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> greater-than curr-column, right
+<span id="L246" class="LineNr"> 246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">return-if</span> at-right?, <span class="Constant">1/go-render</span>
+<span id="L247" class="LineNr"> 247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L248" class="LineNr"> 248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? done.</span>
+<span id="L249" class="LineNr"> 249 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L250" class="LineNr"> 250 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
+<span id="L251" class="LineNr"> 251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L252" class="LineNr"> 252 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, currc
+<span id="L253" class="LineNr"> 253 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr-column <span class="Special">&lt;-</span> add curr-column,<span class="Constant"> 1</span>
+<span id="L254" class="LineNr"> 254 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L255" class="LineNr"> 255 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L256" class="LineNr"> 256 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L257" class="LineNr"> 257 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L258" class="LineNr"> 258 </span>  <span class="Delimiter">}</span>
 <span id="L259" class="LineNr"> 259 </span>  <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L260" class="LineNr"> 260 </span>]
@@ -341,13 +342,13 @@ if ('onhashchange' in window) {
 <span id="L280" class="LineNr"> 280 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L281" class="LineNr"> 281 </span>  assume-console <span class="Constant">[]</span>
 <span id="L282" class="LineNr"> 282 </span>  run [
-<span id="L283" class="LineNr"> 283 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L283" class="LineNr"> 283 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L284" class="LineNr"> 284 </span>  ]
 <span id="L285" class="LineNr"> 285 </span>  screen-should-contain [
-<span id="L286" class="LineNr"> 286 </span>   <span class="Constant"> .          .</span>
-<span id="L287" class="LineNr"> 287 </span>   <span class="Constant"> .abc       .</span>
-<span id="L288" class="LineNr"> 288 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L289" class="LineNr"> 289 </span>   <span class="Constant"> .          .</span>
+<span id="L286" class="LineNr"> 286 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L287" class="LineNr"> 287 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L288" class="LineNr"> 288 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L289" class="LineNr"> 289 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L290" class="LineNr"> 290 </span>  ]
 <span id="L291" class="LineNr"> 291 </span>]
 <span id="L292" class="LineNr"> 292 </span>
@@ -358,22 +359,22 @@ if ('onhashchange' in window) {
 <span id="L297" class="LineNr"> 297 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L298" class="LineNr"> 298 </span>  $clear-trace
 <span id="L299" class="LineNr"> 299 </span>  assume-console [
-<span id="L300" class="LineNr"> 300 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>  <span class="Comment"># on the 'b'</span>
+<span id="L300" class="LineNr"> 300 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>  <span class="Comment"># on the 'b'</span>
 <span id="L301" class="LineNr"> 301 </span>  ]
 <span id="L302" class="LineNr"> 302 </span>  run [
-<span id="L303" class="LineNr"> 303 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L304" class="LineNr"> 304 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L305" class="LineNr"> 305 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L303" class="LineNr"> 303 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L304" class="LineNr"> 304 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L305" class="LineNr"> 305 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L306" class="LineNr"> 306 </span>  ]
 <span id="L307" class="LineNr"> 307 </span>  screen-should-contain [
-<span id="L308" class="LineNr"> 308 </span>   <span class="Constant"> .          .</span>
-<span id="L309" class="LineNr"> 309 </span>   <span class="Constant"> .abc       .</span>
-<span id="L310" class="LineNr"> 310 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L311" class="LineNr"> 311 </span>   <span class="Constant"> .          .</span>
+<span id="L308" class="LineNr"> 308 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L309" class="LineNr"> 309 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L310" class="LineNr"> 310 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L311" class="LineNr"> 311 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L312" class="LineNr"> 312 </span>  ]
 <span id="L313" class="LineNr"> 313 </span>  memory-should-contain [
-<span id="L314" class="LineNr"> 314 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor is at row 0..</span>
-<span id="L315" class="LineNr"> 315 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># ..and column 1</span>
+<span id="L314" class="LineNr"> 314 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor is at row 0..</span>
+<span id="L315" class="LineNr"> 315 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># ..and column 1</span>
 <span id="L316" class="LineNr"> 316 </span>  ]
 <span id="L317" class="LineNr"> 317 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L318" class="LineNr"> 318 </span>]
@@ -384,16 +385,16 @@ if ('onhashchange' in window) {
 <span id="L323" class="LineNr"> 323 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L324" class="LineNr"> 324 </span>  $clear-trace
 <span id="L325" class="LineNr"> 325 </span>  assume-console [
-<span id="L326" class="LineNr"> 326 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 7</span>  <span class="Comment"># last line, to the right of text</span>
+<span id="L326" class="LineNr"> 326 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 7</span>  <span class="Comment"># last line, to the right of text</span>
 <span id="L327" class="LineNr"> 327 </span>  ]
 <span id="L328" class="LineNr"> 328 </span>  run [
-<span id="L329" class="LineNr"> 329 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L330" class="LineNr"> 330 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L331" class="LineNr"> 331 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L329" class="LineNr"> 329 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L330" class="LineNr"> 330 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L331" class="LineNr"> 331 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L332" class="LineNr"> 332 </span>  ]
 <span id="L333" class="LineNr"> 333 </span>  memory-should-contain [
-<span id="L334" class="LineNr"> 334 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L335" class="LineNr"> 335 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
+<span id="L334" class="LineNr"> 334 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L335" class="LineNr"> 335 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
 <span id="L336" class="LineNr"> 336 </span>  ]
 <span id="L337" class="LineNr"> 337 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L338" class="LineNr"> 338 </span>]
@@ -406,16 +407,16 @@ if ('onhashchange' in window) {
 <span id="L345" class="LineNr"> 345 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L346" class="LineNr"> 346 </span>  $clear-trace
 <span id="L347" class="LineNr"> 347 </span>  assume-console [
-<span id="L348" class="LineNr"> 348 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 7</span>  <span class="Comment"># interior line, to the right of text</span>
+<span id="L348" class="LineNr"> 348 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 7</span>  <span class="Comment"># interior line, to the right of text</span>
 <span id="L349" class="LineNr"> 349 </span>  ]
 <span id="L350" class="LineNr"> 350 </span>  run [
-<span id="L351" class="LineNr"> 351 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L352" class="LineNr"> 352 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L353" class="LineNr"> 353 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L351" class="LineNr"> 351 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L352" class="LineNr"> 352 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L353" class="LineNr"> 353 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L354" class="LineNr"> 354 </span>  ]
 <span id="L355" class="LineNr"> 355 </span>  memory-should-contain [
-<span id="L356" class="LineNr"> 356 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
-<span id="L357" class="LineNr"> 357 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
+<span id="L356" class="LineNr"> 356 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
+<span id="L357" class="LineNr"> 357 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
 <span id="L358" class="LineNr"> 358 </span>  ]
 <span id="L359" class="LineNr"> 359 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L360" class="LineNr"> 360 </span>]
@@ -428,16 +429,16 @@ if ('onhashchange' in window) {
 <span id="L367" class="LineNr"> 367 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L368" class="LineNr"> 368 </span>  $clear-trace
 <span id="L369" class="LineNr"> 369 </span>  assume-console [
-<span id="L370" class="LineNr"> 370 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 7</span>  <span class="Comment"># below text</span>
+<span id="L370" class="LineNr"> 370 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 7</span>  <span class="Comment"># below text</span>
 <span id="L371" class="LineNr"> 371 </span>  ]
 <span id="L372" class="LineNr"> 372 </span>  run [
-<span id="L373" class="LineNr"> 373 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L374" class="LineNr"> 374 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L375" class="LineNr"> 375 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L373" class="LineNr"> 373 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L374" class="LineNr"> 374 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L375" class="LineNr"> 375 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L376" class="LineNr"> 376 </span>  ]
 <span id="L377" class="LineNr"> 377 </span>  memory-should-contain [
-<span id="L378" class="LineNr"> 378 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor row</span>
-<span id="L379" class="LineNr"> 379 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
+<span id="L378" class="LineNr"> 378 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor row</span>
+<span id="L379" class="LineNr"> 379 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
 <span id="L380" class="LineNr"> 380 </span>  ]
 <span id="L381" class="LineNr"> 381 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L382" class="LineNr"> 382 </span>]
@@ -450,23 +451,23 @@ if ('onhashchange' in window) {
 <span id="L389" class="LineNr"> 389 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L390" class="LineNr"> 390 </span>  $clear-trace
 <span id="L391" class="LineNr"> 391 </span>  assume-console [
-<span id="L392" class="LineNr"> 392 </span>    <span class="Comment"># click on right half of screen</span>
-<span id="L393" class="LineNr"> 393 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 8</span>
+<span id="L392" class="LineNr"> 392 </span>  <span class="Conceal">¦</span> <span class="Comment"># click on right half of screen</span>
+<span id="L393" class="LineNr"> 393 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 8</span>
 <span id="L394" class="LineNr"> 394 </span>  ]
 <span id="L395" class="LineNr"> 395 </span>  run [
-<span id="L396" class="LineNr"> 396 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L397" class="LineNr"> 397 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L398" class="LineNr"> 398 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L396" class="LineNr"> 396 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L397" class="LineNr"> 397 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L398" class="LineNr"> 398 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L399" class="LineNr"> 399 </span>  ]
 <span id="L400" class="LineNr"> 400 </span>  screen-should-contain [
-<span id="L401" class="LineNr"> 401 </span>   <span class="Constant"> .          .</span>
-<span id="L402" class="LineNr"> 402 </span>   <span class="Constant"> .abc       .</span>
-<span id="L403" class="LineNr"> 403 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L404" class="LineNr"> 404 </span>   <span class="Constant"> .          .</span>
+<span id="L401" class="LineNr"> 401 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L402" class="LineNr"> 402 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L403" class="LineNr"> 403 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L404" class="LineNr"> 404 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L405" class="LineNr"> 405 </span>  ]
 <span id="L406" class="LineNr"> 406 </span>  memory-should-contain [
-<span id="L407" class="LineNr"> 407 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># no change to cursor row</span>
-<span id="L408" class="LineNr"> 408 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># ..or column</span>
+<span id="L407" class="LineNr"> 407 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># no change to cursor row</span>
+<span id="L408" class="LineNr"> 408 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># ..or column</span>
 <span id="L409" class="LineNr"> 409 </span>  ]
 <span id="L410" class="LineNr"> 410 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L411" class="LineNr"> 411 </span>]
@@ -478,18 +479,18 @@ if ('onhashchange' in window) {
 <span id="L417" class="LineNr"> 417 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L418" class="LineNr"> 418 </span>  $clear-trace
 <span id="L419" class="LineNr"> 419 </span>  assume-console [
-<span id="L420" class="LineNr"> 420 </span>    <span class="Comment"># click on first, 'menu' row</span>
-<span id="L421" class="LineNr"> 421 </span>    left-click<span class="Constant"> 0</span>,<span class="Constant"> 3</span>
+<span id="L420" class="LineNr"> 420 </span>  <span class="Conceal">¦</span> <span class="Comment"># click on first, 'menu' row</span>
+<span id="L421" class="LineNr"> 421 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 0</span>,<span class="Constant"> 3</span>
 <span id="L422" class="LineNr"> 422 </span>  ]
 <span id="L423" class="LineNr"> 423 </span>  run [
-<span id="L424" class="LineNr"> 424 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L425" class="LineNr"> 425 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L426" class="LineNr"> 426 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L424" class="LineNr"> 424 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L425" class="LineNr"> 425 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L426" class="LineNr"> 426 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L427" class="LineNr"> 427 </span>  ]
 <span id="L428" class="LineNr"> 428 </span>  <span class="Comment"># no change to cursor</span>
 <span id="L429" class="LineNr"> 429 </span>  memory-should-contain [
-<span id="L430" class="LineNr"> 430 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L431" class="LineNr"> 431 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L430" class="LineNr"> 430 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L431" class="LineNr"> 431 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L432" class="LineNr"> 432 </span>  ]
 <span id="L433" class="LineNr"> 433 </span>]
 <span id="L434" class="LineNr"> 434 </span>
@@ -500,16 +501,16 @@ if ('onhashchange' in window) {
 <span id="L439" class="LineNr"> 439 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L440" class="LineNr"> 440 </span>  $clear-trace
 <span id="L441" class="LineNr"> 441 </span>  assume-console [
-<span id="L442" class="LineNr"> 442 </span>    type <span class="Constant">[abc]</span>
+<span id="L442" class="LineNr"> 442 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abc]</span>
 <span id="L443" class="LineNr"> 443 </span>  ]
 <span id="L444" class="LineNr"> 444 </span>  run [
-<span id="L445" class="LineNr"> 445 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L445" class="LineNr"> 445 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L446" class="LineNr"> 446 </span>  ]
 <span id="L447" class="LineNr"> 447 </span>  screen-should-contain [
-<span id="L448" class="LineNr"> 448 </span>   <span class="Constant"> .          .</span>
-<span id="L449" class="LineNr"> 449 </span>   <span class="Constant"> .abc       .</span>
-<span id="L450" class="LineNr"> 450 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L451" class="LineNr"> 451 </span>   <span class="Constant"> .          .</span>
+<span id="L448" class="LineNr"> 448 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L449" class="LineNr"> 449 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L450" class="LineNr"> 450 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L451" class="LineNr"> 451 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L452" class="LineNr"> 452 </span>  ]
 <span id="L453" class="LineNr"> 453 </span>  check-trace-count-for-label<span class="Constant"> 3</span>, <span class="Constant">[print-character]</span>
 <span id="L454" class="LineNr"> 454 </span>]
@@ -522,18 +523,18 @@ if ('onhashchange' in window) {
 <span id="L461" class="LineNr"> 461 </span>  $clear-trace
 <span id="L462" class="LineNr"> 462 </span>  <span class="Comment"># type two letters at different places</span>
 <span id="L463" class="LineNr"> 463 </span>  assume-console [
-<span id="L464" class="LineNr"> 464 </span>    type <span class="Constant">[0]</span>
-<span id="L465" class="LineNr"> 465 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L466" class="LineNr"> 466 </span>    type <span class="Constant">[d]</span>
+<span id="L464" class="LineNr"> 464 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
+<span id="L465" class="LineNr"> 465 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L466" class="LineNr"> 466 </span>  <span class="Conceal">¦</span> type <span class="Constant">[d]</span>
 <span id="L467" class="LineNr"> 467 </span>  ]
 <span id="L468" class="LineNr"> 468 </span>  run [
-<span id="L469" class="LineNr"> 469 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L469" class="LineNr"> 469 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L470" class="LineNr"> 470 </span>  ]
 <span id="L471" class="LineNr"> 471 </span>  screen-should-contain [
-<span id="L472" class="LineNr"> 472 </span>   <span class="Constant"> .          .</span>
-<span id="L473" class="LineNr"> 473 </span>   <span class="Constant"> .0adbc     .</span>
-<span id="L474" class="LineNr"> 474 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L475" class="LineNr"> 475 </span>   <span class="Constant"> .          .</span>
+<span id="L472" class="LineNr"> 472 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L473" class="LineNr"> 473 </span>  <span class="Conceal">¦</span><span class="Constant"> .0adbc     .</span>
+<span id="L474" class="LineNr"> 474 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L475" class="LineNr"> 475 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L476" class="LineNr"> 476 </span>  ]
 <span id="L477" class="LineNr"> 477 </span>  check-trace-count-for-label<span class="Constant"> 7</span>, <span class="Constant">[print-character]</span>  <span class="Comment"># 4 for first letter, 3 for second</span>
 <span id="L478" class="LineNr"> 478 </span>]
@@ -545,17 +546,17 @@ if ('onhashchange' in window) {
 <span id="L484" class="LineNr"> 484 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L485" class="LineNr"> 485 </span>  $clear-trace
 <span id="L486" class="LineNr"> 486 </span>  assume-console [
-<span id="L487" class="LineNr"> 487 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span>  <span class="Comment"># right of last line</span>
-<span id="L488" class="LineNr"> 488 </span>    type <span class="Constant">[d]</span>
+<span id="L487" class="LineNr"> 487 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span>  <span class="Comment"># right of last line</span>
+<span id="L488" class="LineNr"> 488 </span>  <span class="Conceal">¦</span> type <span class="Constant">[d]</span>
 <span id="L489" class="LineNr"> 489 </span>  ]
 <span id="L490" class="LineNr"> 490 </span>  run [
-<span id="L491" class="LineNr"> 491 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L491" class="LineNr"> 491 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L492" class="LineNr"> 492 </span>  ]
 <span id="L493" class="LineNr"> 493 </span>  screen-should-contain [
-<span id="L494" class="LineNr"> 494 </span>   <span class="Constant"> .          .</span>
-<span id="L495" class="LineNr"> 495 </span>   <span class="Constant"> .abcd      .</span>
-<span id="L496" class="LineNr"> 496 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L497" class="LineNr"> 497 </span>   <span class="Constant"> .          .</span>
+<span id="L494" class="LineNr"> 494 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L495" class="LineNr"> 495 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd      .</span>
+<span id="L496" class="LineNr"> 496 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L497" class="LineNr"> 497 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L498" class="LineNr"> 498 </span>  ]
 <span id="L499" class="LineNr"> 499 </span>  check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
 <span id="L500" class="LineNr"> 500 </span>]
@@ -569,18 +570,18 @@ if ('onhashchange' in window) {
 <span id="L508" class="LineNr"> 508 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L509" class="LineNr"> 509 </span>  $clear-trace
 <span id="L510" class="LineNr"> 510 </span>  assume-console [
-<span id="L511" class="LineNr"> 511 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span>  <span class="Comment"># right of non-last line</span>
-<span id="L512" class="LineNr"> 512 </span>    type <span class="Constant">[e]</span>
+<span id="L511" class="LineNr"> 511 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span>  <span class="Comment"># right of non-last line</span>
+<span id="L512" class="LineNr"> 512 </span>  <span class="Conceal">¦</span> type <span class="Constant">[e]</span>
 <span id="L513" class="LineNr"> 513 </span>  ]
 <span id="L514" class="LineNr"> 514 </span>  run [
-<span id="L515" class="LineNr"> 515 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L515" class="LineNr"> 515 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L516" class="LineNr"> 516 </span>  ]
 <span id="L517" class="LineNr"> 517 </span>  screen-should-contain [
-<span id="L518" class="LineNr"> 518 </span>   <span class="Constant"> .          .</span>
-<span id="L519" class="LineNr"> 519 </span>   <span class="Constant"> .abce      .</span>
-<span id="L520" class="LineNr"> 520 </span>   <span class="Constant"> .d         .</span>
-<span id="L521" class="LineNr"> 521 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L522" class="LineNr"> 522 </span>   <span class="Constant"> .          .</span>
+<span id="L518" class="LineNr"> 518 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L519" class="LineNr"> 519 </span>  <span class="Conceal">¦</span><span class="Constant"> .abce      .</span>
+<span id="L520" class="LineNr"> 520 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L521" class="LineNr"> 521 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L522" class="LineNr"> 522 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L523" class="LineNr"> 523 </span>  ]
 <span id="L524" class="LineNr"> 524 </span>  check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
 <span id="L525" class="LineNr"> 525 </span>]
@@ -592,17 +593,17 @@ if ('onhashchange' in window) {
 <span id="L531" class="LineNr"> 531 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L532" class="LineNr"> 532 </span>  $clear-trace
 <span id="L533" class="LineNr"> 533 </span>  assume-console [
-<span id="L534" class="LineNr"> 534 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span>  <span class="Comment"># below all text</span>
-<span id="L535" class="LineNr"> 535 </span>    type <span class="Constant">[d]</span>
+<span id="L534" class="LineNr"> 534 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span>  <span class="Comment"># below all text</span>
+<span id="L535" class="LineNr"> 535 </span>  <span class="Conceal">¦</span> type <span class="Constant">[d]</span>
 <span id="L536" class="LineNr"> 536 </span>  ]
 <span id="L537" class="LineNr"> 537 </span>  run [
-<span id="L538" class="LineNr"> 538 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L538" class="LineNr"> 538 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L539" class="LineNr"> 539 </span>  ]
 <span id="L540" class="LineNr"> 540 </span>  screen-should-contain [
-<span id="L541" class="LineNr"> 541 </span>   <span class="Constant"> .          .</span>
-<span id="L542" class="LineNr"> 542 </span>   <span class="Constant"> .abcd      .</span>
-<span id="L543" class="LineNr"> 543 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L544" class="LineNr"> 544 </span>   <span class="Constant"> .          .</span>
+<span id="L541" class="LineNr"> 541 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L542" class="LineNr"> 542 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd      .</span>
+<span id="L543" class="LineNr"> 543 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L544" class="LineNr"> 544 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L545" class="LineNr"> 545 </span>  ]
 <span id="L546" class="LineNr"> 546 </span>  check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
 <span id="L547" class="LineNr"> 547 </span>]
@@ -616,18 +617,18 @@ if ('onhashchange' in window) {
 <span id="L555" class="LineNr"> 555 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L556" class="LineNr"> 556 </span>  $clear-trace
 <span id="L557" class="LineNr"> 557 </span>  assume-console [
-<span id="L558" class="LineNr"> 558 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span>  <span class="Comment"># below all text</span>
-<span id="L559" class="LineNr"> 559 </span>    type <span class="Constant">[e]</span>
+<span id="L558" class="LineNr"> 558 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span>  <span class="Comment"># below all text</span>
+<span id="L559" class="LineNr"> 559 </span>  <span class="Conceal">¦</span> type <span class="Constant">[e]</span>
 <span id="L560" class="LineNr"> 560 </span>  ]
 <span id="L561" class="LineNr"> 561 </span>  run [
-<span id="L562" class="LineNr"> 562 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L562" class="LineNr"> 562 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L563" class="LineNr"> 563 </span>  ]
 <span id="L564" class="LineNr"> 564 </span>  screen-should-contain [
-<span id="L565" class="LineNr"> 565 </span>   <span class="Constant"> .          .</span>
-<span id="L566" class="LineNr"> 566 </span>   <span class="Constant"> .abc       .</span>
-<span id="L567" class="LineNr"> 567 </span>   <span class="Constant"> .de        .</span>
-<span id="L568" class="LineNr"> 568 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L569" class="LineNr"> 569 </span>   <span class="Constant"> .          .</span>
+<span id="L565" class="LineNr"> 565 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L566" class="LineNr"> 566 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L567" class="LineNr"> 567 </span>  <span class="Conceal">¦</span><span class="Constant"> .de        .</span>
+<span id="L568" class="LineNr"> 568 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L569" class="LineNr"> 569 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L570" class="LineNr"> 570 </span>  ]
 <span id="L571" class="LineNr"> 571 </span>  check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
 <span id="L572" class="LineNr"> 572 </span>]
@@ -641,18 +642,18 @@ if ('onhashchange' in window) {
 <span id="L580" class="LineNr"> 580 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L581" class="LineNr"> 581 </span>  $clear-trace
 <span id="L582" class="LineNr"> 582 </span>  assume-console [
-<span id="L583" class="LineNr"> 583 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span>  <span class="Comment"># below all text</span>
-<span id="L584" class="LineNr"> 584 </span>    type <span class="Constant">[ef]</span>
+<span id="L583" class="LineNr"> 583 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 5</span>  <span class="Comment"># below all text</span>
+<span id="L584" class="LineNr"> 584 </span>  <span class="Conceal">¦</span> type <span class="Constant">[ef]</span>
 <span id="L585" class="LineNr"> 585 </span>  ]
 <span id="L586" class="LineNr"> 586 </span>  run [
-<span id="L587" class="LineNr"> 587 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L587" class="LineNr"> 587 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L588" class="LineNr"> 588 </span>  ]
 <span id="L589" class="LineNr"> 589 </span>  screen-should-contain [
-<span id="L590" class="LineNr"> 590 </span>   <span class="Constant"> .          .</span>
-<span id="L591" class="LineNr"> 591 </span>   <span class="Constant"> .abc       .</span>
-<span id="L592" class="LineNr"> 592 </span>   <span class="Constant"> .def       .</span>
-<span id="L593" class="LineNr"> 593 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L594" class="LineNr"> 594 </span>   <span class="Constant"> .          .</span>
+<span id="L590" class="LineNr"> 590 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L591" class="LineNr"> 591 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L592" class="LineNr"> 592 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L593" class="LineNr"> 593 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L594" class="LineNr"> 594 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L595" class="LineNr"> 595 </span>  ]
 <span id="L596" class="LineNr"> 596 </span>  check-trace-count-for-label<span class="Constant"> 2</span>, <span class="Constant">[print-character]</span>
 <span id="L597" class="LineNr"> 597 </span>]
@@ -663,16 +664,16 @@ if ('onhashchange' in window) {
 <span id="L602" class="LineNr"> 602 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[ab]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L603" class="LineNr"> 603 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L604" class="LineNr"> 604 </span>  assume-console [
-<span id="L605" class="LineNr"> 605 </span>    type <span class="Constant">[01]</span>
+<span id="L605" class="LineNr"> 605 </span>  <span class="Conceal">¦</span> type <span class="Constant">[01]</span>
 <span id="L606" class="LineNr"> 606 </span>  ]
 <span id="L607" class="LineNr"> 607 </span>  run [
-<span id="L608" class="LineNr"> 608 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L608" class="LineNr"> 608 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L609" class="LineNr"> 609 </span>  ]
 <span id="L610" class="LineNr"> 610 </span>  screen-should-contain [
-<span id="L611" class="LineNr"> 611 </span>   <span class="Constant"> .          .</span>
-<span id="L612" class="LineNr"> 612 </span>   <span class="Constant"> .01ab      .</span>
-<span id="L613" class="LineNr"> 613 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L614" class="LineNr"> 614 </span>   <span class="Constant"> .          .</span>
+<span id="L611" class="LineNr"> 611 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L612" class="LineNr"> 612 </span>  <span class="Conceal">¦</span><span class="Constant"> .01ab      .</span>
+<span id="L613" class="LineNr"> 613 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L614" class="LineNr"> 614 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L615" class="LineNr"> 615 </span>  ]
 <span id="L616" class="LineNr"> 616 </span>]
 <span id="L617" class="LineNr"> 617 </span>
@@ -685,33 +686,33 @@ if ('onhashchange' in window) {
 <span id="L624" class="LineNr"> 624 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L625" class="LineNr"> 625 </span>  <span class="Comment"># type a letter</span>
 <span id="L626" class="LineNr"> 626 </span>  assume-console [
-<span id="L627" class="LineNr"> 627 </span>    type <span class="Constant">[e]</span>
+<span id="L627" class="LineNr"> 627 </span>  <span class="Conceal">¦</span> type <span class="Constant">[e]</span>
 <span id="L628" class="LineNr"> 628 </span>  ]
 <span id="L629" class="LineNr"> 629 </span>  run [
-<span id="L630" class="LineNr"> 630 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L630" class="LineNr"> 630 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L631" class="LineNr"> 631 </span>  ]
 <span id="L632" class="LineNr"> 632 </span>  <span class="Comment"># no wrap yet</span>
 <span id="L633" class="LineNr"> 633 </span>  screen-should-contain [
-<span id="L634" class="LineNr"> 634 </span>   <span class="Constant"> .     .</span>
-<span id="L635" class="LineNr"> 635 </span>   <span class="Constant"> .eabc .</span>
-<span id="L636" class="LineNr"> 636 </span><span class="Constant">    .╌╌╌╌╌.</span>
-<span id="L637" class="LineNr"> 637 </span>   <span class="Constant"> .     .</span>
-<span id="L638" class="LineNr"> 638 </span>   <span class="Constant"> .     .</span>
+<span id="L634" class="LineNr"> 634 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L635" class="LineNr"> 635 </span>  <span class="Conceal">¦</span><span class="Constant"> .eabc .</span>
+<span id="L636" class="LineNr"> 636 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌.</span>
+<span id="L637" class="LineNr"> 637 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L638" class="LineNr"> 638 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L639" class="LineNr"> 639 </span>  ]
 <span id="L640" class="LineNr"> 640 </span>  <span class="Comment"># type a second letter</span>
 <span id="L641" class="LineNr"> 641 </span>  assume-console [
-<span id="L642" class="LineNr"> 642 </span>    type <span class="Constant">[f]</span>
+<span id="L642" class="LineNr"> 642 </span>  <span class="Conceal">¦</span> type <span class="Constant">[f]</span>
 <span id="L643" class="LineNr"> 643 </span>  ]
 <span id="L644" class="LineNr"> 644 </span>  run [
-<span id="L645" class="LineNr"> 645 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L645" class="LineNr"> 645 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L646" class="LineNr"> 646 </span>  ]
 <span id="L647" class="LineNr"> 647 </span>  <span class="Comment"># now wrap</span>
 <span id="L648" class="LineNr"> 648 </span>  screen-should-contain [
-<span id="L649" class="LineNr"> 649 </span>   <span class="Constant"> .     .</span>
-<span id="L650" class="LineNr"> 650 </span><span class="Constant">    .efab↩.</span>
-<span id="L651" class="LineNr"> 651 </span>   <span class="Constant"> .c    .</span>
-<span id="L652" class="LineNr"> 652 </span><span class="Constant">    .╌╌╌╌╌.</span>
-<span id="L653" class="LineNr"> 653 </span>   <span class="Constant"> .     .</span>
+<span id="L649" class="LineNr"> 649 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L650" class="LineNr"> 650 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .efab↩.</span>
+<span id="L651" class="LineNr"> 651 </span>  <span class="Conceal">¦</span><span class="Constant"> .c    .</span>
+<span id="L652" class="LineNr"> 652 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌.</span>
+<span id="L653" class="LineNr"> 653 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L654" class="LineNr"> 654 </span>  ]
 <span id="L655" class="LineNr"> 655 </span>]
 <span id="L656" class="LineNr"> 656 </span>
@@ -725,76 +726,76 @@ if ('onhashchange' in window) {
 <span id="L664" class="LineNr"> 664 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L665" class="LineNr"> 665 </span>  <span class="Comment"># type more text at the start</span>
 <span id="L666" class="LineNr"> 666 </span>  assume-console [
-<span id="L667" class="LineNr"> 667 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L668" class="LineNr"> 668 </span>    type <span class="Constant">[abc]</span>
+<span id="L667" class="LineNr"> 667 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L668" class="LineNr"> 668 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abc]</span>
 <span id="L669" class="LineNr"> 669 </span>  ]
 <span id="L670" class="LineNr"> 670 </span>  run [
-<span id="L671" class="LineNr"> 671 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L672" class="LineNr"> 672 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L673" class="LineNr"> 673 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L671" class="LineNr"> 671 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L672" class="LineNr"> 672 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L673" class="LineNr"> 673 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L674" class="LineNr"> 674 </span>  ]
 <span id="L675" class="LineNr"> 675 </span>  <span class="Comment"># cursor is not wrapped</span>
 <span id="L676" class="LineNr"> 676 </span>  memory-should-contain [
-<span id="L677" class="LineNr"> 677 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L678" class="LineNr"> 678 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L677" class="LineNr"> 677 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L678" class="LineNr"> 678 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L679" class="LineNr"> 679 </span>  ]
 <span id="L680" class="LineNr"> 680 </span>  <span class="Comment"># but line is wrapped</span>
 <span id="L681" class="LineNr"> 681 </span>  screen-should-contain [
-<span id="L682" class="LineNr"> 682 </span>   <span class="Constant"> .          .</span>
-<span id="L683" class="LineNr"> 683 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L684" class="LineNr"> 684 </span>   <span class="Constant"> .efg       .</span>
-<span id="L685" class="LineNr"> 685 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L686" class="LineNr"> 686 </span>   <span class="Constant"> .efg       .</span>
+<span id="L682" class="LineNr"> 682 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L683" class="LineNr"> 683 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L684" class="LineNr"> 684 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg       .</span>
+<span id="L685" class="LineNr"> 685 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L686" class="LineNr"> 686 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg       .</span>
 <span id="L687" class="LineNr"> 687 </span>  ]
 <span id="L688" class="LineNr"> 688 </span>]
 <span id="L689" class="LineNr"> 689 </span>
 <span id="L690" class="LineNr"> 690 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L217'>&lt;insert-character-special-case&gt;</a></span> [
 <span id="L691" class="LineNr"> 691 </span>  <span class="Comment"># if the line wraps at the cursor, move cursor to start of next row</span>
 <span id="L692" class="LineNr"> 692 </span>  <span class="Delimiter">{</span>
-<span id="L693" class="LineNr"> 693 </span>    <span class="Comment"># if either:</span>
-<span id="L694" class="LineNr"> 694 </span>    <span class="Comment"># a) we're at the end of the line and at the column of the wrap indicator, or</span>
-<span id="L695" class="LineNr"> 695 </span>    <span class="Comment"># b) we're not at end of line and just before the column of the wrap indicator</span>
-<span id="L696" class="LineNr"> 696 </span>    wrap-column:num <span class="Special">&lt;-</span> copy right
-<span id="L697" class="LineNr"> 697 </span>    before-wrap-column:num <span class="Special">&lt;-</span> subtract wrap-column,<span class="Constant"> 1</span>
-<span id="L698" class="LineNr"> 698 </span>    at-wrap?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, wrap-column
-<span id="L699" class="LineNr"> 699 </span>    just-before-wrap?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, before-wrap-column
-<span id="L700" class="LineNr"> 700 </span>    <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L701" class="LineNr"> 701 </span>    <span class="Comment"># at end of line? next == 0 || next.value == 10/newline</span>
-<span id="L702" class="LineNr"> 702 </span>    at-end-of-line?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L29'>next</a>,<span class="Constant"> 0</span>
-<span id="L703" class="LineNr"> 703 </span>    <span class="Delimiter">{</span>
-<span id="L704" class="LineNr"> 704 </span>      <span class="muControl">break-if</span> at-end-of-line?
-<span id="L705" class="LineNr"> 705 </span>      next-character:char <span class="Special">&lt;-</span> get *next, <span class="Constant">value:offset</span>
-<span id="L706" class="LineNr"> 706 </span>      at-end-of-line? <span class="Special">&lt;-</span> equal next-character, <span class="Constant">10/newline</span>
-<span id="L707" class="LineNr"> 707 </span>    <span class="Delimiter">}</span>
-<span id="L708" class="LineNr"> 708 </span>    <span class="Comment"># break unless ((eol? and at-wrap?) or (~eol? and just-before-wrap?))</span>
-<span id="L709" class="LineNr"> 709 </span>    move-cursor-to-next-line?:bool <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
-<span id="L710" class="LineNr"> 710 </span>    <span class="Delimiter">{</span>
-<span id="L711" class="LineNr"> 711 </span>      <span class="muControl">break-if</span> at-end-of-line?
-<span id="L712" class="LineNr"> 712 </span>      move-cursor-to-next-line? <span class="Special">&lt;-</span> copy just-before-wrap?
-<span id="L713" class="LineNr"> 713 </span>      <span class="Comment"># if we're moving the cursor because it's in the middle of a wrapping</span>
-<span id="L714" class="LineNr"> 714 </span>      <span class="Comment"># line, adjust it to left-most column</span>
-<span id="L715" class="LineNr"> 715 </span>      potential-new-cursor-column:num <span class="Special">&lt;-</span> copy left
-<span id="L716" class="LineNr"> 716 </span>    <span class="Delimiter">}</span>
-<span id="L717" class="LineNr"> 717 </span>    <span class="Delimiter">{</span>
-<span id="L718" class="LineNr"> 718 </span>      <span class="muControl">break-unless</span> at-end-of-line?
-<span id="L719" class="LineNr"> 719 </span>      move-cursor-to-next-line? <span class="Special">&lt;-</span> copy at-wrap?
-<span id="L720" class="LineNr"> 720 </span>      <span class="Comment"># if we're moving the cursor because it's at the end of a wrapping line,</span>
-<span id="L721" class="LineNr"> 721 </span>      <span class="Comment"># adjust it to one past the left-most column to make room for the</span>
-<span id="L722" class="LineNr"> 722 </span>      <span class="Comment"># newly-inserted wrap-indicator</span>
-<span id="L723" class="LineNr"> 723 </span>      potential-new-cursor-column:num <span class="Special">&lt;-</span> add left, <span class="Constant">1/make-room-for-wrap-indicator</span>
-<span id="L724" class="LineNr"> 724 </span>    <span class="Delimiter">}</span>
-<span id="L725" class="LineNr"> 725 </span>    <span class="muControl">break-unless</span> move-cursor-to-next-line?
-<span id="L726" class="LineNr"> 726 </span>    cursor-column <span class="Special">&lt;-</span> copy potential-new-cursor-column
-<span id="L727" class="LineNr"> 727 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L728" class="LineNr"> 728 </span>    cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
-<span id="L729" class="LineNr"> 729 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L730" class="LineNr"> 730 </span>    <span class="Comment"># if we're out of the screen, scroll down</span>
-<span id="L731" class="LineNr"> 731 </span>    <span class="Delimiter">{</span>
-<span id="L732" class="LineNr"> 732 </span>      below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L733" class="LineNr"> 733 </span>      <span class="muControl">break-unless</span> below-screen?
-<span id="L734" class="LineNr"> 734 </span><span class="Constant">      &lt;scroll-down&gt;</span>
-<span id="L735" class="LineNr"> 735 </span>    <span class="Delimiter">}</span>
-<span id="L736" class="LineNr"> 736 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L693" class="LineNr"> 693 </span>  <span class="Conceal">¦</span> <span class="Comment"># if either:</span>
+<span id="L694" class="LineNr"> 694 </span>  <span class="Conceal">¦</span> <span class="Comment"># a) we're at the end of the line and at the column of the wrap indicator, or</span>
+<span id="L695" class="LineNr"> 695 </span>  <span class="Conceal">¦</span> <span class="Comment"># b) we're not at end of line and just before the column of the wrap indicator</span>
+<span id="L696" class="LineNr"> 696 </span>  <span class="Conceal">¦</span> wrap-column:num <span class="Special">&lt;-</span> copy right
+<span id="L697" class="LineNr"> 697 </span>  <span class="Conceal">¦</span> before-wrap-column:num <span class="Special">&lt;-</span> subtract wrap-column,<span class="Constant"> 1</span>
+<span id="L698" class="LineNr"> 698 </span>  <span class="Conceal">¦</span> at-wrap?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, wrap-column
+<span id="L699" class="LineNr"> 699 </span>  <span class="Conceal">¦</span> just-before-wrap?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, before-wrap-column
+<span id="L700" class="LineNr"> 700 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L701" class="LineNr"> 701 </span>  <span class="Conceal">¦</span> <span class="Comment"># at end of line? next == 0 || next.value == 10/newline</span>
+<span id="L702" class="LineNr"> 702 </span>  <span class="Conceal">¦</span> at-end-of-line?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L29'>next</a>,<span class="Constant"> 0</span>
+<span id="L703" class="LineNr"> 703 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L704" class="LineNr"> 704 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-end-of-line?
+<span id="L705" class="LineNr"> 705 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> next-character:char <span class="Special">&lt;-</span> get *next, <span class="Constant">value:offset</span>
+<span id="L706" class="LineNr"> 706 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-end-of-line? <span class="Special">&lt;-</span> equal next-character, <span class="Constant">10/newline</span>
+<span id="L707" class="LineNr"> 707 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L708" class="LineNr"> 708 </span>  <span class="Conceal">¦</span> <span class="Comment"># break unless ((eol? and at-wrap?) or (~eol? and just-before-wrap?))</span>
+<span id="L709" class="LineNr"> 709 </span>  <span class="Conceal">¦</span> move-cursor-to-next-line?:bool <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
+<span id="L710" class="LineNr"> 710 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L711" class="LineNr"> 711 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-end-of-line?
+<span id="L712" class="LineNr"> 712 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> move-cursor-to-next-line? <span class="Special">&lt;-</span> copy just-before-wrap?
+<span id="L713" class="LineNr"> 713 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if we're moving the cursor because it's in the middle of a wrapping</span>
+<span id="L714" class="LineNr"> 714 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># line, adjust it to left-most column</span>
+<span id="L715" class="LineNr"> 715 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> potential-new-cursor-column:num <span class="Special">&lt;-</span> copy left
+<span id="L716" class="LineNr"> 716 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L717" class="LineNr"> 717 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L718" class="LineNr"> 718 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-end-of-line?
+<span id="L719" class="LineNr"> 719 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> move-cursor-to-next-line? <span class="Special">&lt;-</span> copy at-wrap?
+<span id="L720" class="LineNr"> 720 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if we're moving the cursor because it's at the end of a wrapping line,</span>
+<span id="L721" class="LineNr"> 721 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># adjust it to one past the left-most column to make room for the</span>
+<span id="L722" class="LineNr"> 722 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newly-inserted wrap-indicator</span>
+<span id="L723" class="LineNr"> 723 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> potential-new-cursor-column:num <span class="Special">&lt;-</span> add left, <span class="Constant">1/make-room-for-wrap-indicator</span>
+<span id="L724" class="LineNr"> 724 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L725" class="LineNr"> 725 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-cursor-to-next-line?
+<span id="L726" class="LineNr"> 726 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy potential-new-cursor-column
+<span id="L727" class="LineNr"> 727 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L728" class="LineNr"> 728 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
+<span id="L729" class="LineNr"> 729 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L730" class="LineNr"> 730 </span>  <span class="Conceal">¦</span> <span class="Comment"># if we're out of the screen, scroll down</span>
+<span id="L731" class="LineNr"> 731 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L732" class="LineNr"> 732 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L733" class="LineNr"> 733 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> below-screen?
+<span id="L734" class="LineNr"> 734 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> &lt;scroll-down&gt;</span>
+<span id="L735" class="LineNr"> 735 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L736" class="LineNr"> 736 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L737" class="LineNr"> 737 </span>  <span class="Delimiter">}</span>
 <span id="L738" class="LineNr"> 738 </span>]
 <span id="L739" class="LineNr"> 739 </span>
@@ -803,24 +804,24 @@ if ('onhashchange' in window) {
 <span id="L742" class="LineNr"> 742 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
 <span id="L743" class="LineNr"> 743 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abcde]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L744" class="LineNr"> 744 </span>  assume-console [
-<span id="L745" class="LineNr"> 745 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>  <span class="Comment"># right before the wrap icon</span>
-<span id="L746" class="LineNr"> 746 </span>    type <span class="Constant">[f]</span>
+<span id="L745" class="LineNr"> 745 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>  <span class="Comment"># right before the wrap icon</span>
+<span id="L746" class="LineNr"> 746 </span>  <span class="Conceal">¦</span> type <span class="Constant">[f]</span>
 <span id="L747" class="LineNr"> 747 </span>  ]
 <span id="L748" class="LineNr"> 748 </span>  run [
-<span id="L749" class="LineNr"> 749 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L750" class="LineNr"> 750 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L751" class="LineNr"> 751 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L749" class="LineNr"> 749 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L750" class="LineNr"> 750 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L751" class="LineNr"> 751 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L752" class="LineNr"> 752 </span>  ]
 <span id="L753" class="LineNr"> 753 </span>  screen-should-contain [
-<span id="L754" class="LineNr"> 754 </span>   <span class="Constant"> .          .</span>
-<span id="L755" class="LineNr"> 755 </span>   <span class="Constant"> .abcf↩     .</span>
-<span id="L756" class="LineNr"> 756 </span>   <span class="Constant"> .de        .</span>
-<span id="L757" class="LineNr"> 757 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L758" class="LineNr"> 758 </span>   <span class="Constant"> .          .</span>
+<span id="L754" class="LineNr"> 754 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L755" class="LineNr"> 755 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcf↩     .</span>
+<span id="L756" class="LineNr"> 756 </span>  <span class="Conceal">¦</span><span class="Constant"> .de        .</span>
+<span id="L757" class="LineNr"> 757 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L758" class="LineNr"> 758 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L759" class="LineNr"> 759 </span>  ]
 <span id="L760" class="LineNr"> 760 </span>  memory-should-contain [
-<span id="L761" class="LineNr"> 761 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor row</span>
-<span id="L762" class="LineNr"> 762 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
+<span id="L761" class="LineNr"> 761 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor row</span>
+<span id="L762" class="LineNr"> 762 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
 <span id="L763" class="LineNr"> 763 </span>  ]
 <span id="L764" class="LineNr"> 764 </span>]
 <span id="L765" class="LineNr"> 765 </span>
@@ -833,25 +834,25 @@ if ('onhashchange' in window) {
 <span id="L772" class="LineNr"> 772 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L773" class="LineNr"> 773 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L774" class="LineNr"> 774 </span>  screen-should-contain [
-<span id="L775" class="LineNr"> 775 </span>   <span class="Constant"> .          .</span>
-<span id="L776" class="LineNr"> 776 </span>   <span class="Constant"> .abc       .</span>
-<span id="L777" class="LineNr"> 777 </span>   <span class="Constant"> .xyz       .</span>
-<span id="L778" class="LineNr"> 778 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L779" class="LineNr"> 779 </span>   <span class="Constant"> .          .</span>
+<span id="L775" class="LineNr"> 775 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L776" class="LineNr"> 776 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L777" class="LineNr"> 777 </span>  <span class="Conceal">¦</span><span class="Constant"> .xyz       .</span>
+<span id="L778" class="LineNr"> 778 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L779" class="LineNr"> 779 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L780" class="LineNr"> 780 </span>  ]
 <span id="L781" class="LineNr"> 781 </span>  assume-console [
-<span id="L782" class="LineNr"> 782 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span>  <span class="Comment"># at end of first line</span>
-<span id="L783" class="LineNr"> 783 </span>    type <span class="Constant">[de]</span>  <span class="Comment"># trigger wrap</span>
+<span id="L782" class="LineNr"> 782 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span>  <span class="Comment"># at end of first line</span>
+<span id="L783" class="LineNr"> 783 </span>  <span class="Conceal">¦</span> type <span class="Constant">[de]</span>  <span class="Comment"># trigger wrap</span>
 <span id="L784" class="LineNr"> 784 </span>  ]
 <span id="L785" class="LineNr"> 785 </span>  run [
-<span id="L786" class="LineNr"> 786 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L786" class="LineNr"> 786 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L787" class="LineNr"> 787 </span>  ]
 <span id="L788" class="LineNr"> 788 </span>  screen-should-contain [
-<span id="L789" class="LineNr"> 789 </span>   <span class="Constant"> .          .</span>
-<span id="L790" class="LineNr"> 790 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L791" class="LineNr"> 791 </span>   <span class="Constant"> .e         .</span>
-<span id="L792" class="LineNr"> 792 </span>   <span class="Constant"> .xyz       .</span>
-<span id="L793" class="LineNr"> 793 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L789" class="LineNr"> 789 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L790" class="LineNr"> 790 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L791" class="LineNr"> 791 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L792" class="LineNr"> 792 </span>  <span class="Conceal">¦</span><span class="Constant"> .xyz       .</span>
+<span id="L793" class="LineNr"> 793 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
 <span id="L794" class="LineNr"> 794 </span>  ]
 <span id="L795" class="LineNr"> 795 </span>]
 <span id="L796" class="LineNr"> 796 </span>
@@ -860,24 +861,24 @@ if ('onhashchange' in window) {
 <span id="L799" class="LineNr"> 799 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
 <span id="L800" class="LineNr"> 800 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abcde]</span>, <span class="Constant">2/left</span>, <span class="Constant">7/right</span>
 <span id="L801" class="LineNr"> 801 </span>  assume-console [
-<span id="L802" class="LineNr"> 802 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span>  <span class="Comment"># line is full; no wrap icon yet</span>
-<span id="L803" class="LineNr"> 803 </span>    type <span class="Constant">[01]</span>
+<span id="L802" class="LineNr"> 802 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 5</span>  <span class="Comment"># line is full; no wrap icon yet</span>
+<span id="L803" class="LineNr"> 803 </span>  <span class="Conceal">¦</span> type <span class="Constant">[01]</span>
 <span id="L804" class="LineNr"> 804 </span>  ]
 <span id="L805" class="LineNr"> 805 </span>  run [
-<span id="L806" class="LineNr"> 806 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L807" class="LineNr"> 807 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L808" class="LineNr"> 808 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L806" class="LineNr"> 806 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L807" class="LineNr"> 807 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L808" class="LineNr"> 808 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L809" class="LineNr"> 809 </span>  ]
 <span id="L810" class="LineNr"> 810 </span>  screen-should-contain [
-<span id="L811" class="LineNr"> 811 </span>   <span class="Constant"> .          .</span>
-<span id="L812" class="LineNr"> 812 </span>   <span class="Constant"> .  abc0↩   .</span>
-<span id="L813" class="LineNr"> 813 </span>   <span class="Constant"> .  1de     .</span>
-<span id="L814" class="LineNr"> 814 </span>   <span class="Constant"> .  ╌╌╌╌╌   .</span>
-<span id="L815" class="LineNr"> 815 </span>   <span class="Constant"> .          .</span>
+<span id="L811" class="LineNr"> 811 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L812" class="LineNr"> 812 </span>  <span class="Conceal">¦</span><span class="Constant"> .  abc0↩   .</span>
+<span id="L813" class="LineNr"> 813 </span>  <span class="Conceal">¦</span><span class="Constant"> .  1de     .</span>
+<span id="L814" class="LineNr"> 814 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ╌╌╌╌╌   .</span>
+<span id="L815" class="LineNr"> 815 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L816" class="LineNr"> 816 </span>  ]
 <span id="L817" class="LineNr"> 817 </span>  memory-should-contain [
-<span id="L818" class="LineNr"> 818 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor row</span>
-<span id="L819" class="LineNr"> 819 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
+<span id="L818" class="LineNr"> 818 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor row</span>
+<span id="L819" class="LineNr"> 819 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor column</span>
 <span id="L820" class="LineNr"> 820 </span>  ]
 <span id="L821" class="LineNr"> 821 </span>]
 <span id="L822" class="LineNr"> 822 </span>
@@ -896,29 +897,29 @@ if ('onhashchange' in window) {
 <span id="L835" class="LineNr"> 835 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
 <span id="L836" class="LineNr"> 836 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L837" class="LineNr"> 837 </span>  assume-console [
-<span id="L838" class="LineNr"> 838 </span>    type <span class="Constant">[0</span>
+<span id="L838" class="LineNr"> 838 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0</span>
 <span id="L839" class="LineNr"> 839 </span><span class="Constant">1]</span>
 <span id="L840" class="LineNr"> 840 </span>  ]
 <span id="L841" class="LineNr"> 841 </span>  run [
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+<span id="L842" class="LineNr"> 842 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L843" class="LineNr"> 843 </span>  ]
 <span id="L844" class="LineNr"> 844 </span>  screen-should-contain [
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-<span id="L846" class="LineNr"> 846 </span>   <span class="Constant"> .0         .</span>
-<span id="L847" class="LineNr"> 847 </span>   <span class="Constant"> .1abc      .</span>
-<span id="L848" class="LineNr"> 848 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L849" class="LineNr"> 849 </span>   <span class="Constant"> .          .</span>
+<span id="L845" class="LineNr"> 845 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L846" class="LineNr"> 846 </span>  <span class="Conceal">¦</span><span class="Constant"> .0         .</span>
+<span id="L847" class="LineNr"> 847 </span>  <span class="Conceal">¦</span><span class="Constant"> .1abc      .</span>
+<span id="L848" class="LineNr"> 848 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L849" class="LineNr"> 849 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
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 <span id="L852" class="LineNr"> 852 </span>
 <span id="L853" class="LineNr"> 853 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L854" class="LineNr"> 854 </span>  <span class="Delimiter">{</span>
-<span id="L855" class="LineNr"> 855 </span>    newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L856" class="LineNr"> 856 </span>    <span class="muControl">break-unless</span> newline?
-<span id="L857" class="LineNr"> 857 </span><span class="Constant">    <a href='002-typing.mu.html#L857'>&lt;insert-enter-begin&gt;</a></span>
-<span id="L858" class="LineNr"> 858 </span>    <a href='002-typing.mu.html#L864'>insert-new-line-and-indent</a> editor, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L859" class="LineNr"> 859 </span><span class="Constant">    <a href='002-typing.mu.html#L859'>&lt;insert-enter-end&gt;</a></span>
-<span id="L860" class="LineNr"> 860 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L855" class="LineNr"> 855 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L856" class="LineNr"> 856 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L857" class="LineNr"> 857 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='002-typing.mu.html#L857'>&lt;insert-enter-begin&gt;</a></span>
+<span id="L858" class="LineNr"> 858 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L864'>insert-new-line-and-indent</a> editor, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L859" class="LineNr"> 859 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='002-typing.mu.html#L859'>&lt;insert-enter-end&gt;</a></span>
+<span id="L860" class="LineNr"> 860 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L861" class="LineNr"> 861 </span>  <span class="Delimiter">}</span>
 <span id="L862" class="LineNr"> 862 </span>]
 <span id="L863" class="LineNr"> 863 </span>
@@ -941,11 +942,11 @@ if ('onhashchange' in window) {
 <span id="L880" class="LineNr"> 880 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
 <span id="L881" class="LineNr"> 881 </span>  <span class="Comment"># maybe scroll</span>
 <span id="L882" class="LineNr"> 882 </span>  <span class="Delimiter">{</span>
-<span id="L883" class="LineNr"> 883 </span>    below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>  <span class="Comment"># must be equal, never greater</span>
-<span id="L884" class="LineNr"> 884 </span>    <span class="muControl">break-unless</span> below-screen?
-<span id="L885" class="LineNr"> 885 </span><span class="Constant">    &lt;scroll-down&gt;</span>
-<span id="L886" class="LineNr"> 886 </span>    cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># bring back into screen range</span>
-<span id="L887" class="LineNr"> 887 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L883" class="LineNr"> 883 </span>  <span class="Conceal">¦</span> below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>  <span class="Comment"># must be equal, never greater</span>
+<span id="L884" class="LineNr"> 884 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> below-screen?
+<span id="L885" class="LineNr"> 885 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;scroll-down&gt;</span>
+<span id="L886" class="LineNr"> 886 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># bring back into screen range</span>
+<span id="L887" class="LineNr"> 887 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
 <span id="L888" class="LineNr"> 888 </span>  <span class="Delimiter">}</span>
 <span id="L889" class="LineNr"> 889 </span>  <span class="Comment"># indent if necessary</span>
 <span id="L890" class="LineNr"> 890 </span>  indent?:bool <span class="Special">&lt;-</span> get *editor, <span class="Constant">indent?:offset</span>
@@ -955,11 +956,11 @@ if ('onhashchange' in window) {
 <span id="L894" class="LineNr"> 894 </span>  indent:num <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L907'>line-indent</a> end-of-previous-line, d
 <span id="L895" class="LineNr"> 895 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L896" class="LineNr"> 896 </span>  <span class="Delimiter">{</span>
-<span id="L897" class="LineNr"> 897 </span>    indent-done?:bool <span class="Special">&lt;-</span> greater-or-equal i, indent
-<span id="L898" class="LineNr"> 898 </span>    <span class="muControl">break-if</span> indent-done?
-<span id="L899" class="LineNr"> 899 </span>    <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, <span class="Constant">32/space</span>, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L900" class="LineNr"> 900 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L901" class="LineNr"> 901 </span>    <span class="muControl">loop</span>
+<span id="L897" class="LineNr"> 897 </span>  <span class="Conceal">¦</span> indent-done?:bool <span class="Special">&lt;-</span> greater-or-equal i, indent
+<span id="L898" class="LineNr"> 898 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> indent-done?
+<span id="L899" class="LineNr"> 899 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, <span class="Constant">32/space</span>, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L900" class="LineNr"> 900 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L901" class="LineNr"> 901 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L902" class="LineNr"> 902 </span>  <span class="Delimiter">}</span>
 <span id="L903" class="LineNr"> 903 </span>]
 <span id="L904" class="LineNr"> 904 </span>
@@ -973,25 +974,25 @@ if ('onhashchange' in window) {
 <span id="L912" class="LineNr"> 912 </span>  at-start?:bool <span class="Special">&lt;-</span> equal curr, start
 <span id="L913" class="LineNr"> 913 </span>  <span class="muControl">return-if</span> at-start?
 <span id="L914" class="LineNr"> 914 </span>  <span class="Delimiter">{</span>
-<span id="L915" class="LineNr"> 915 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
-<span id="L916" class="LineNr"> 916 </span>    <span class="muControl">break-unless</span> curr
-<span id="L917" class="LineNr"> 917 </span>    at-start?:bool <span class="Special">&lt;-</span> equal curr, start
-<span id="L918" class="LineNr"> 918 </span>    <span class="muControl">break-if</span> at-start?
-<span id="L919" class="LineNr"> 919 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L920" class="LineNr"> 920 </span>    at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L921" class="LineNr"> 921 </span>    <span class="muControl">break-if</span> at-newline?
-<span id="L922" class="LineNr"> 922 </span>    <span class="Comment"># if c is a space, increment result</span>
-<span id="L923" class="LineNr"> 923 </span>    is-space?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">32/space</span>
-<span id="L924" class="LineNr"> 924 </span>    <span class="Delimiter">{</span>
-<span id="L925" class="LineNr"> 925 </span>      <span class="muControl">break-unless</span> is-space?
-<span id="L926" class="LineNr"> 926 </span>      result <span class="Special">&lt;-</span> add result,<span class="Constant"> 1</span>
-<span id="L927" class="LineNr"> 927 </span>    <span class="Delimiter">}</span>
-<span id="L928" class="LineNr"> 928 </span>    <span class="Comment"># if c is not a space, reset result</span>
-<span id="L929" class="LineNr"> 929 </span>    <span class="Delimiter">{</span>
-<span id="L930" class="LineNr"> 930 </span>      <span class="muControl">break-if</span> is-space?
-<span id="L931" class="LineNr"> 931 </span>      result <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
-<span id="L932" class="LineNr"> 932 </span>    <span class="Delimiter">}</span>
-<span id="L933" class="LineNr"> 933 </span>    <span class="muControl">loop</span>
+<span id="L915" class="LineNr"> 915 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
+<span id="L916" class="LineNr"> 916 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L917" class="LineNr"> 917 </span>  <span class="Conceal">¦</span> at-start?:bool <span class="Special">&lt;-</span> equal curr, start
+<span id="L918" class="LineNr"> 918 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-start?
+<span id="L919" class="LineNr"> 919 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L920" class="LineNr"> 920 </span>  <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L921" class="LineNr"> 921 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L922" class="LineNr"> 922 </span>  <span class="Conceal">¦</span> <span class="Comment"># if c is a space, increment result</span>
+<span id="L923" class="LineNr"> 923 </span>  <span class="Conceal">¦</span> is-space?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">32/space</span>
+<span id="L924" class="LineNr"> 924 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L925" class="LineNr"> 925 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-space?
+<span id="L926" class="LineNr"> 926 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> add result,<span class="Constant"> 1</span>
+<span id="L927" class="LineNr"> 927 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L928" class="LineNr"> 928 </span>  <span class="Conceal">¦</span> <span class="Comment"># if c is not a space, reset result</span>
+<span id="L929" class="LineNr"> 929 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L930" class="LineNr"> 930 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> is-space?
+<span id="L931" class="LineNr"> 931 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L932" class="LineNr"> 932 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L933" class="LineNr"> 933 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L934" class="LineNr"> 934 </span>  <span class="Delimiter">}</span>
 <span id="L935" class="LineNr"> 935 </span>]
 <span id="L936" class="LineNr"> 936 </span>
@@ -1000,18 +1001,18 @@ if ('onhashchange' in window) {
 <span id="L939" class="LineNr"> 939 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
 <span id="L940" class="LineNr"> 940 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
 <span id="L941" class="LineNr"> 941 </span>  assume-console [
-<span id="L942" class="LineNr"> 942 </span>    type <span class="Constant">[0</span>
+<span id="L942" class="LineNr"> 942 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0</span>
 <span id="L943" class="LineNr"> 943 </span><span class="Constant">1]</span>
 <span id="L944" class="LineNr"> 944 </span>  ]
 <span id="L945" class="LineNr"> 945 </span>  run [
-<span id="L946" class="LineNr"> 946 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L946" class="LineNr"> 946 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L947" class="LineNr"> 947 </span>  ]
 <span id="L948" class="LineNr"> 948 </span>  screen-should-contain [
-<span id="L949" class="LineNr"> 949 </span>   <span class="Constant"> .          .</span>
-<span id="L950" class="LineNr"> 950 </span>   <span class="Constant"> . 0        .</span>
-<span id="L951" class="LineNr"> 951 </span>   <span class="Constant"> . 1abc     .</span>
-<span id="L952" class="LineNr"> 952 </span>   <span class="Constant"> . ╌╌╌╌╌╌╌╌╌.</span>
-<span id="L953" class="LineNr"> 953 </span>   <span class="Constant"> .          .</span>
+<span id="L949" class="LineNr"> 949 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L950" class="LineNr"> 950 </span>  <span class="Conceal">¦</span><span class="Constant"> . 0        .</span>
+<span id="L951" class="LineNr"> 951 </span>  <span class="Conceal">¦</span><span class="Constant"> . 1abc     .</span>
+<span id="L952" class="LineNr"> 952 </span>  <span class="Conceal">¦</span><span class="Constant"> . ╌╌╌╌╌╌╌╌╌.</span>
+<span id="L953" class="LineNr"> 953 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L954" class="LineNr"> 954 </span>  ]
 <span id="L955" class="LineNr"> 955 </span>]
 <span id="L956" class="LineNr"> 956 </span>
@@ -1021,25 +1022,25 @@ if ('onhashchange' in window) {
 <span id="L960" class="LineNr"> 960 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abcde]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L961" class="LineNr"> 961 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L962" class="LineNr"> 962 </span>  screen-should-contain [
-<span id="L963" class="LineNr"> 963 </span>   <span class="Constant"> .          .</span>
-<span id="L964" class="LineNr"> 964 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L965" class="LineNr"> 965 </span>   <span class="Constant"> .e         .</span>
-<span id="L966" class="LineNr"> 966 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L967" class="LineNr"> 967 </span>   <span class="Constant"> .          .</span>
+<span id="L963" class="LineNr"> 963 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L964" class="LineNr"> 964 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L965" class="LineNr"> 965 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L966" class="LineNr"> 966 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L967" class="LineNr"> 967 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L968" class="LineNr"> 968 </span>  ]
 <span id="L969" class="LineNr"> 969 </span>  assume-console [
-<span id="L970" class="LineNr"> 970 </span>    press enter
+<span id="L970" class="LineNr"> 970 </span>  <span class="Conceal">¦</span> press enter
 <span id="L971" class="LineNr"> 971 </span>  ]
 <span id="L972" class="LineNr"> 972 </span>  run [
-<span id="L973" class="LineNr"> 973 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L973" class="LineNr"> 973 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L974" class="LineNr"> 974 </span>  ]
 <span id="L975" class="LineNr"> 975 </span>  <span class="Comment"># line should be fully cleared</span>
 <span id="L976" class="LineNr"> 976 </span>  screen-should-contain [
-<span id="L977" class="LineNr"> 977 </span>   <span class="Constant"> .          .</span>
-<span id="L978" class="LineNr"> 978 </span>   <span class="Constant"> .          .</span>
-<span id="L979" class="LineNr"> 979 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L980" class="LineNr"> 980 </span>   <span class="Constant"> .e         .</span>
-<span id="L981" class="LineNr"> 981 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L977" class="LineNr"> 977 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L978" class="LineNr"> 978 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L979" class="LineNr"> 979 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L980" class="LineNr"> 980 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L981" class="LineNr"> 981 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
 <span id="L982" class="LineNr"> 982 </span>  ]
 <span id="L983" class="LineNr"> 983 </span>]
 <span id="L984" class="LineNr"> 984 </span>
@@ -1052,19 +1053,19 @@ if ('onhashchange' in window) {
 <span id="L991" class="LineNr"> 991 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L992" class="LineNr"> 992 </span>  <span class="Comment"># position cursor after 'cd' and hit 'newline'</span>
 <span id="L993" class="LineNr"> 993 </span>  assume-console [
-<span id="L994" class="LineNr"> 994 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 8</span>
-<span id="L995" class="LineNr"> 995 </span>    type [
+<span id="L994" class="LineNr"> 994 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 8</span>
+<span id="L995" class="LineNr"> 995 </span>  <span class="Conceal">¦</span> type [
 <span id="L996" class="LineNr"> 996 </span>]
 <span id="L997" class="LineNr"> 997 </span>  ]
 <span id="L998" class="LineNr"> 998 </span>  run [
-<span id="L999" class="LineNr"> 999 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1000" class="LineNr">1000 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1001" class="LineNr">1001 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L999" class="LineNr"> 999 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1000" class="LineNr">1000 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1001" class="LineNr">1001 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1002" class="LineNr">1002 </span>  ]
 <span id="L1003" class="LineNr">1003 </span>  <span class="Comment"># cursor should be below start of previous line</span>
 <span id="L1004" class="LineNr">1004 </span>  memory-should-contain [
-<span id="L1005" class="LineNr">1005 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor row</span>
-<span id="L1006" class="LineNr">1006 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column (indented)</span>
+<span id="L1005" class="LineNr">1005 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor row</span>
+<span id="L1006" class="LineNr">1006 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column (indented)</span>
 <span id="L1007" class="LineNr">1007 </span>  ]
 <span id="L1008" class="LineNr">1008 </span>]
 <span id="L1009" class="LineNr">1009 </span>
@@ -1077,38 +1078,38 @@ if ('onhashchange' in window) {
 <span id="L1016" class="LineNr">1016 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1017" class="LineNr">1017 </span>  <span class="Comment"># position cursor after 'cd' and hit 'newline' surrounded by paste markers</span>
 <span id="L1018" class="LineNr">1018 </span>  assume-console [
-<span id="L1019" class="LineNr">1019 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 8</span>
-<span id="L1020" class="LineNr">1020 </span>    press<span class="Constant"> 65507</span>  <span class="Comment"># start paste</span>
-<span id="L1021" class="LineNr">1021 </span>    press enter
-<span id="L1022" class="LineNr">1022 </span>    press<span class="Constant"> 65506</span>  <span class="Comment"># end paste</span>
+<span id="L1019" class="LineNr">1019 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 8</span>
+<span id="L1020" class="LineNr">1020 </span>  <span class="Conceal">¦</span> press<span class="Constant"> 65507</span>  <span class="Comment"># start paste</span>
+<span id="L1021" class="LineNr">1021 </span>  <span class="Conceal">¦</span> press enter
+<span id="L1022" class="LineNr">1022 </span>  <span class="Conceal">¦</span> press<span class="Constant"> 65506</span>  <span class="Comment"># end paste</span>
 <span id="L1023" class="LineNr">1023 </span>  ]
 <span id="L1024" class="LineNr">1024 </span>  run [
-<span id="L1025" class="LineNr">1025 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1026" class="LineNr">1026 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1027" class="LineNr">1027 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1025" class="LineNr">1025 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1026" class="LineNr">1026 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1027" class="LineNr">1027 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1028" class="LineNr">1028 </span>  ]
 <span id="L1029" class="LineNr">1029 </span>  <span class="Comment"># cursor should be below start of previous line</span>
 <span id="L1030" class="LineNr">1030 </span>  memory-should-contain [
-<span id="L1031" class="LineNr">1031 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor row</span>
-<span id="L1032" class="LineNr">1032 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column (not indented)</span>
+<span id="L1031" class="LineNr">1031 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># cursor row</span>
+<span id="L1032" class="LineNr">1032 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column (not indented)</span>
 <span id="L1033" class="LineNr">1033 </span>  ]
 <span id="L1034" class="LineNr">1034 </span>]
 <span id="L1035" class="LineNr">1035 </span>
 <span id="L1036" class="LineNr">1036 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L1037" class="LineNr">1037 </span>  <span class="Delimiter">{</span>
-<span id="L1038" class="LineNr">1038 </span>    paste-start?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65507/paste-start</span>
-<span id="L1039" class="LineNr">1039 </span>    <span class="muControl">break-unless</span> paste-start?
-<span id="L1040" class="LineNr">1040 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">indent?:offset</span>, <span class="Constant">0/false</span>
-<span id="L1041" class="LineNr">1041 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L1038" class="LineNr">1038 </span>  <span class="Conceal">¦</span> paste-start?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65507/paste-start</span>
+<span id="L1039" class="LineNr">1039 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> paste-start?
+<span id="L1040" class="LineNr">1040 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">indent?:offset</span>, <span class="Constant">0/false</span>
+<span id="L1041" class="LineNr">1041 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L1042" class="LineNr">1042 </span>  <span class="Delimiter">}</span>
 <span id="L1043" class="LineNr">1043 </span>]
 <span id="L1044" class="LineNr">1044 </span>
 <span id="L1045" class="LineNr">1045 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L1046" class="LineNr">1046 </span>  <span class="Delimiter">{</span>
-<span id="L1047" class="LineNr">1047 </span>    paste-end?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65506/paste-end</span>
-<span id="L1048" class="LineNr">1048 </span>    <span class="muControl">break-unless</span> paste-end?
-<span id="L1049" class="LineNr">1049 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">indent?:offset</span>, <span class="Constant">1/true</span>
-<span id="L1050" class="LineNr">1050 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L1047" class="LineNr">1047 </span>  <span class="Conceal">¦</span> paste-end?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65506/paste-end</span>
+<span id="L1048" class="LineNr">1048 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> paste-end?
+<span id="L1049" class="LineNr">1049 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">indent?:offset</span>, <span class="Constant">1/true</span>
+<span id="L1050" class="LineNr">1050 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L1051" class="LineNr">1051 </span>  <span class="Delimiter">}</span>
 <span id="L1052" class="LineNr">1052 </span>]
 <span id="L1053" class="LineNr">1053 </span>
@@ -1119,27 +1120,27 @@ if ('onhashchange' in window) {
 <span id="L1058" class="LineNr">1058 </span>  <span class="Constant">load-ingredients</span>
 <span id="L1059" class="LineNr">1059 </span>  style:char, style-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L1060" class="LineNr">1060 </span>  <span class="Delimiter">{</span>
-<span id="L1061" class="LineNr">1061 </span>    <span class="muControl">break-if</span> style-found?
-<span id="L1062" class="LineNr">1062 </span>    style <span class="Special">&lt;-</span> copy <span class="Constant">9472/horizontal</span>
+<span id="L1061" class="LineNr">1061 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> style-found?
+<span id="L1062" class="LineNr">1062 </span>  <span class="Conceal">¦</span> style <span class="Special">&lt;-</span> copy <span class="Constant">9472/horizontal</span>
 <span id="L1063" class="LineNr">1063 </span>  <span class="Delimiter">}</span>
 <span id="L1064" class="LineNr">1064 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L1065" class="LineNr">1065 </span>  <span class="Delimiter">{</span>
-<span id="L1066" class="LineNr">1066 </span>    <span class="Comment"># default color to white</span>
-<span id="L1067" class="LineNr">1067 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L1068" class="LineNr">1068 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
+<span id="L1066" class="LineNr">1066 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L1067" class="LineNr">1067 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L1068" class="LineNr">1068 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
 <span id="L1069" class="LineNr">1069 </span>  <span class="Delimiter">}</span>
 <span id="L1070" class="LineNr">1070 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L1071" class="LineNr">1071 </span>  <span class="Delimiter">{</span>
-<span id="L1072" class="LineNr">1072 </span>    <span class="muControl">break-if</span> bg-color-found?
-<span id="L1073" class="LineNr">1073 </span>    bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L1072" class="LineNr">1072 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L1073" class="LineNr">1073 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
 <span id="L1074" class="LineNr">1074 </span>  <span class="Delimiter">}</span>
 <span id="L1075" class="LineNr">1075 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, x
 <span id="L1076" class="LineNr">1076 </span>  <span class="Delimiter">{</span>
-<span id="L1077" class="LineNr">1077 </span>    continue?:bool <span class="Special">&lt;-</span> lesser-or-equal x, right  <span class="Comment"># right is inclusive, to match editor semantics</span>
-<span id="L1078" class="LineNr">1078 </span>    <span class="muControl">break-unless</span> continue?
-<span id="L1079" class="LineNr">1079 </span>    print <a href='../081print.mu.html#L4'>screen</a>, style, color, bg-color
-<span id="L1080" class="LineNr">1080 </span>    x <span class="Special">&lt;-</span> add x,<span class="Constant"> 1</span>
-<span id="L1081" class="LineNr">1081 </span>    <span class="muControl">loop</span>
+<span id="L1077" class="LineNr">1077 </span>  <span class="Conceal">¦</span> continue?:bool <span class="Special">&lt;-</span> lesser-or-equal x, right  <span class="Comment"># right is inclusive, to match editor semantics</span>
+<span id="L1078" class="LineNr">1078 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> continue?
+<span id="L1079" class="LineNr">1079 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, style, color, bg-color
+<span id="L1080" class="LineNr">1080 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> add x,<span class="Constant"> 1</span>
+<span id="L1081" class="LineNr">1081 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1082" class="LineNr">1082 </span>  <span class="Delimiter">}</span>
 <span id="L1083" class="LineNr">1083 </span>]
 </pre>
diff --git a/html/edit/003-shortcuts.mu.html b/html/edit/003-shortcuts.mu.html
index 0881417f..2220376e 100644
--- a/html/edit/003-shortcuts.mu.html
+++ b/html/edit/003-shortcuts.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -72,27 +73,27 @@ if ('onhashchange' in window) {
 <span id="L12" class="LineNr">  12 </span><span class="Constant">cd]</span>
 <span id="L13" class="LineNr">  13 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L14" class="LineNr">  14 </span>  assume-console [
-<span id="L15" class="LineNr">  15 </span>    press tab
+<span id="L15" class="LineNr">  15 </span>  <span class="Conceal">¦</span> press tab
 <span id="L16" class="LineNr">  16 </span>  ]
 <span id="L17" class="LineNr">  17 </span>  run [
-<span id="L18" class="LineNr">  18 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L18" class="LineNr">  18 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L19" class="LineNr">  19 </span>  ]
 <span id="L20" class="LineNr">  20 </span>  screen-should-contain [
-<span id="L21" class="LineNr">  21 </span>   <span class="Constant"> .          .</span>
-<span id="L22" class="LineNr">  22 </span>   <span class="Constant"> .  ab      .</span>
-<span id="L23" class="LineNr">  23 </span>   <span class="Constant"> .cd        .</span>
+<span id="L21" class="LineNr">  21 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L22" class="LineNr">  22 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab      .</span>
+<span id="L23" class="LineNr">  23 </span>  <span class="Conceal">¦</span><span class="Constant"> .cd        .</span>
 <span id="L24" class="LineNr">  24 </span>  ]
 <span id="L25" class="LineNr">  25 </span>]
 <span id="L26" class="LineNr">  26 </span>
 <span id="L27" class="LineNr">  27 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L28" class="LineNr">  28 </span>  <span class="Delimiter">{</span>
-<span id="L29" class="LineNr">  29 </span>    tab?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">9/tab</span>
-<span id="L30" class="LineNr">  30 </span>    <span class="muControl">break-unless</span> tab?
-<span id="L31" class="LineNr">  31 </span><span class="Constant">    &lt;insert-character-begin&gt;</span>
-<span id="L32" class="LineNr">  32 </span>    <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, <span class="Constant">32/space</span>, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L33" class="LineNr">  33 </span>    <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, <span class="Constant">32/space</span>, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L34" class="LineNr">  34 </span><span class="Constant">    &lt;insert-character-end&gt;</span>
-<span id="L35" class="LineNr">  35 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L29" class="LineNr">  29 </span>  <span class="Conceal">¦</span> tab?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">9/tab</span>
+<span id="L30" class="LineNr">  30 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> tab?
+<span id="L31" class="LineNr">  31 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;insert-character-begin&gt;</span>
+<span id="L32" class="LineNr">  32 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, <span class="Constant">32/space</span>, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L33" class="LineNr">  33 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L201'>insert-at-cursor</a> editor, <span class="Constant">32/space</span>, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L34" class="LineNr">  34 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;insert-character-end&gt;</span>
+<span id="L35" class="LineNr">  35 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L36" class="LineNr">  36 </span>  <span class="Delimiter">}</span>
 <span id="L37" class="LineNr">  37 </span>]
 <span id="L38" class="LineNr">  38 </span>
@@ -105,35 +106,35 @@ if ('onhashchange' in window) {
 <span id="L45" class="LineNr">  45 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L46" class="LineNr">  46 </span>  $clear-trace
 <span id="L47" class="LineNr">  47 </span>  assume-console [
-<span id="L48" class="LineNr">  48 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L49" class="LineNr">  49 </span>    press backspace
+<span id="L48" class="LineNr">  48 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L49" class="LineNr">  49 </span>  <span class="Conceal">¦</span> press backspace
 <span id="L50" class="LineNr">  50 </span>  ]
 <span id="L51" class="LineNr">  51 </span>  run [
-<span id="L52" class="LineNr">  52 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L53" class="LineNr">  53 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L54" class="LineNr">  54 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L52" class="LineNr">  52 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L53" class="LineNr">  53 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L54" class="LineNr">  54 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L55" class="LineNr">  55 </span>  ]
 <span id="L56" class="LineNr">  56 </span>  screen-should-contain [
-<span id="L57" class="LineNr">  57 </span>   <span class="Constant"> .          .</span>
-<span id="L58" class="LineNr">  58 </span>   <span class="Constant"> .bc        .</span>
-<span id="L59" class="LineNr">  59 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L60" class="LineNr">  60 </span>   <span class="Constant"> .          .</span>
+<span id="L57" class="LineNr">  57 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L58" class="LineNr">  58 </span>  <span class="Conceal">¦</span><span class="Constant"> .bc        .</span>
+<span id="L59" class="LineNr">  59 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L60" class="LineNr">  60 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L61" class="LineNr">  61 </span>  ]
 <span id="L62" class="LineNr">  62 </span>  memory-should-contain [
-<span id="L63" class="LineNr">  63 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L64" class="LineNr">  64 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L63" class="LineNr">  63 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L64" class="LineNr">  64 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L65" class="LineNr">  65 </span>  ]
 <span id="L66" class="LineNr">  66 </span>  check-trace-count-for-label<span class="Constant"> 3</span>, <span class="Constant">[print-character]</span>  <span class="Comment"># length of original line to overwrite</span>
 <span id="L67" class="LineNr">  67 </span>]
 <span id="L68" class="LineNr">  68 </span>
 <span id="L69" class="LineNr">  69 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L70" class="LineNr">  70 </span>  <span class="Delimiter">{</span>
-<span id="L71" class="LineNr">  71 </span>    delete-previous-character?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">8/backspace</span>
-<span id="L72" class="LineNr">  72 </span>    <span class="muControl">break-unless</span> delete-previous-character?
-<span id="L73" class="LineNr">  73 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L73'>&lt;backspace-character-begin&gt;</a></span>
-<span id="L74" class="LineNr">  74 </span>    go-render?:bool, backspaced-cell:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L83'>delete-before-cursor</a> editor, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L75" class="LineNr">  75 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L75'>&lt;backspace-character-end&gt;</a></span>
-<span id="L76" class="LineNr">  76 </span>    <span class="muControl">return</span>
+<span id="L71" class="LineNr">  71 </span>  <span class="Conceal">¦</span> delete-previous-character?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">8/backspace</span>
+<span id="L72" class="LineNr">  72 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> delete-previous-character?
+<span id="L73" class="LineNr">  73 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L73'>&lt;backspace-character-begin&gt;</a></span>
+<span id="L74" class="LineNr">  74 </span>  <span class="Conceal">¦</span> go-render?:bool, backspaced-cell:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L83'>delete-before-cursor</a> editor, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L75" class="LineNr">  75 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L75'>&lt;backspace-character-end&gt;</a></span>
+<span id="L76" class="LineNr">  76 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L77" class="LineNr">  77 </span>  <span class="Delimiter">}</span>
 <span id="L78" class="LineNr">  78 </span>]
 <span id="L79" class="LineNr">  79 </span>
@@ -168,18 +169,18 @@ if ('onhashchange' in window) {
 <span id="L108" class="LineNr"> 108 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
 <span id="L109" class="LineNr"> 109 </span>  curr-column:num <span class="Special">&lt;-</span> copy cursor-column
 <span id="L110" class="LineNr"> 110 </span>  <span class="Delimiter">{</span>
-<span id="L111" class="LineNr"> 111 </span>    <span class="Comment"># hit right margin? give up and let caller render</span>
-<span id="L112" class="LineNr"> 112 </span>    at-right?:bool <span class="Special">&lt;-</span> greater-or-equal curr-column, right
-<span id="L113" class="LineNr"> 113 </span>    <span class="muControl">return-if</span> at-right?, <span class="Constant">1/go-render</span>
-<span id="L114" class="LineNr"> 114 </span>    <span class="muControl">break-unless</span> curr
-<span id="L115" class="LineNr"> 115 </span>    <span class="Comment"># newline? done.</span>
-<span id="L116" class="LineNr"> 116 </span>    currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L117" class="LineNr"> 117 </span>    at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
-<span id="L118" class="LineNr"> 118 </span>    <span class="muControl">break-if</span> at-newline?
-<span id="L119" class="LineNr"> 119 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='../081print.mu.html#L4'>screen</a>, currc
-<span id="L120" class="LineNr"> 120 </span>    curr-column <span class="Special">&lt;-</span> add curr-column,<span class="Constant"> 1</span>
-<span id="L121" class="LineNr"> 121 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L122" class="LineNr"> 122 </span>    <span class="muControl">loop</span>
+<span id="L111" class="LineNr"> 111 </span>  <span class="Conceal">¦</span> <span class="Comment"># hit right margin? give up and let caller render</span>
+<span id="L112" class="LineNr"> 112 </span>  <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> greater-or-equal curr-column, right
+<span id="L113" class="LineNr"> 113 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> at-right?, <span class="Constant">1/go-render</span>
+<span id="L114" class="LineNr"> 114 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L115" class="LineNr"> 115 </span>  <span class="Conceal">¦</span> <span class="Comment"># newline? done.</span>
+<span id="L116" class="LineNr"> 116 </span>  <span class="Conceal">¦</span> currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L117" class="LineNr"> 117 </span>  <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
+<span id="L118" class="LineNr"> 118 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L119" class="LineNr"> 119 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='../081print.mu.html#L4'>screen</a>, currc
+<span id="L120" class="LineNr"> 120 </span>  <span class="Conceal">¦</span> curr-column <span class="Special">&lt;-</span> add curr-column,<span class="Constant"> 1</span>
+<span id="L121" class="LineNr"> 121 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L122" class="LineNr"> 122 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L123" class="LineNr"> 123 </span>  <span class="Delimiter">}</span>
 <span id="L124" class="LineNr"> 124 </span>  <span class="Comment"># we're guaranteed not to be at the right margin</span>
 <span id="L125" class="LineNr"> 125 </span>  space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
@@ -197,49 +198,49 @@ if ('onhashchange' in window) {
 <span id="L137" class="LineNr"> 137 </span>  left:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">left:offset</span>
 <span id="L138" class="LineNr"> 138 </span>  <span class="Comment"># if not at left margin, move one character left</span>
 <span id="L139" class="LineNr"> 139 </span>  <span class="Delimiter">{</span>
-<span id="L140" class="LineNr"> 140 </span>    at-left-margin?:bool <span class="Special">&lt;-</span> equal cursor-column, left
-<span id="L141" class="LineNr"> 141 </span>    <span class="muControl">break-if</span> at-left-margin?
-<span id="L142" class="LineNr"> 142 </span>    trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[decrementing cursor column]</span>
-<span id="L143" class="LineNr"> 143 </span>    cursor-column <span class="Special">&lt;-</span> subtract cursor-column,<span class="Constant"> 1</span>
-<span id="L144" class="LineNr"> 144 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L145" class="LineNr"> 145 </span>    <span class="muControl">return</span>
+<span id="L140" class="LineNr"> 140 </span>  <span class="Conceal">¦</span> at-left-margin?:bool <span class="Special">&lt;-</span> equal cursor-column, left
+<span id="L141" class="LineNr"> 141 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-left-margin?
+<span id="L142" class="LineNr"> 142 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[decrementing cursor column]</span>
+<span id="L143" class="LineNr"> 143 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> subtract cursor-column,<span class="Constant"> 1</span>
+<span id="L144" class="LineNr"> 144 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L145" class="LineNr"> 145 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L146" class="LineNr"> 146 </span>  <span class="Delimiter">}</span>
 <span id="L147" class="LineNr"> 147 </span>  <span class="Comment"># if at left margin, we must move to previous row:</span>
 <span id="L148" class="LineNr"> 148 </span>  top-of-screen?:bool <span class="Special">&lt;-</span> equal cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># exclude menu bar</span>
 <span id="L149" class="LineNr"> 149 </span>  <span class="Delimiter">{</span>
-<span id="L150" class="LineNr"> 150 </span>    <span class="muControl">break-if</span> top-of-screen?
-<span id="L151" class="LineNr"> 151 </span>    cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>
-<span id="L152" class="LineNr"> 152 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L150" class="LineNr"> 150 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> top-of-screen?
+<span id="L151" class="LineNr"> 151 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>
+<span id="L152" class="LineNr"> 152 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
 <span id="L153" class="LineNr"> 153 </span>  <span class="Delimiter">}</span>
 <span id="L154" class="LineNr"> 154 </span>  <span class="Delimiter">{</span>
-<span id="L155" class="LineNr"> 155 </span>    <span class="muControl">break-unless</span> top-of-screen?
-<span id="L156" class="LineNr"> 156 </span><span class="Constant">    &lt;scroll-up&gt;</span>
-<span id="L157" class="LineNr"> 157 </span>    go-render? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>
+<span id="L155" class="LineNr"> 155 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> top-of-screen?
+<span id="L156" class="LineNr"> 156 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;scroll-up&gt;</span>
+<span id="L157" class="LineNr"> 157 </span>  <span class="Conceal">¦</span> go-render? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>
 <span id="L158" class="LineNr"> 158 </span>  <span class="Delimiter">}</span>
 <span id="L159" class="LineNr"> 159 </span>  <span class="Delimiter">{</span>
-<span id="L160" class="LineNr"> 160 </span>    <span class="Comment"># case 1: if previous character was newline, figure out how long the previous line is</span>
-<span id="L161" class="LineNr"> 161 </span>    previous-character:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
-<span id="L162" class="LineNr"> 162 </span>    previous-character-is-newline?:bool <span class="Special">&lt;-</span> equal previous-character, <span class="Constant">10/newline</span>
-<span id="L163" class="LineNr"> 163 </span>    <span class="muControl">break-unless</span> previous-character-is-newline?
-<span id="L164" class="LineNr"> 164 </span>    <span class="Comment"># compute length of previous line</span>
-<span id="L165" class="LineNr"> 165 </span>    trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[switching to previous line]</span>
-<span id="L166" class="LineNr"> 166 </span>    d:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
-<span id="L167" class="LineNr"> 167 </span>    end-of-line:num <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L193'>previous-line-length</a> before-cursor, d
-<span id="L168" class="LineNr"> 168 </span>    right:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">right:offset</span>
-<span id="L169" class="LineNr"> 169 </span>    width:num <span class="Special">&lt;-</span> subtract right, left
-<span id="L170" class="LineNr"> 170 </span>    wrap?:bool <span class="Special">&lt;-</span> greater-than end-of-line, width
-<span id="L171" class="LineNr"> 171 </span>    <span class="Delimiter">{</span>
-<span id="L172" class="LineNr"> 172 </span>      <span class="muControl">break-unless</span> wrap?
-<span id="L173" class="LineNr"> 173 </span>      _, column-offset:num <span class="Special">&lt;-</span> divide-with-remainder end-of-line, width
-<span id="L174" class="LineNr"> 174 </span>      cursor-column <span class="Special">&lt;-</span> add left, column-offset
-<span id="L175" class="LineNr"> 175 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L176" class="LineNr"> 176 </span>    <span class="Delimiter">}</span>
-<span id="L177" class="LineNr"> 177 </span>    <span class="Delimiter">{</span>
-<span id="L178" class="LineNr"> 178 </span>      <span class="muControl">break-if</span> wrap?
-<span id="L179" class="LineNr"> 179 </span>      cursor-column <span class="Special">&lt;-</span> add left, end-of-line
-<span id="L180" class="LineNr"> 180 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L181" class="LineNr"> 181 </span>    <span class="Delimiter">}</span>
-<span id="L182" class="LineNr"> 182 </span>    <span class="muControl">return</span>
+<span id="L160" class="LineNr"> 160 </span>  <span class="Conceal">¦</span> <span class="Comment"># case 1: if previous character was newline, figure out how long the previous line is</span>
+<span id="L161" class="LineNr"> 161 </span>  <span class="Conceal">¦</span> previous-character:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
+<span id="L162" class="LineNr"> 162 </span>  <span class="Conceal">¦</span> previous-character-is-newline?:bool <span class="Special">&lt;-</span> equal previous-character, <span class="Constant">10/newline</span>
+<span id="L163" class="LineNr"> 163 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> previous-character-is-newline?
+<span id="L164" class="LineNr"> 164 </span>  <span class="Conceal">¦</span> <span class="Comment"># compute length of previous line</span>
+<span id="L165" class="LineNr"> 165 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[switching to previous line]</span>
+<span id="L166" class="LineNr"> 166 </span>  <span class="Conceal">¦</span> d:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
+<span id="L167" class="LineNr"> 167 </span>  <span class="Conceal">¦</span> end-of-line:num <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L193'>previous-line-length</a> before-cursor, d
+<span id="L168" class="LineNr"> 168 </span>  <span class="Conceal">¦</span> right:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">right:offset</span>
+<span id="L169" class="LineNr"> 169 </span>  <span class="Conceal">¦</span> width:num <span class="Special">&lt;-</span> subtract right, left
+<span id="L170" class="LineNr"> 170 </span>  <span class="Conceal">¦</span> wrap?:bool <span class="Special">&lt;-</span> greater-than end-of-line, width
+<span id="L171" class="LineNr"> 171 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L172" class="LineNr"> 172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> wrap?
+<span id="L173" class="LineNr"> 173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> _, column-offset:num <span class="Special">&lt;-</span> divide-with-remainder end-of-line, width
+<span id="L174" class="LineNr"> 174 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> add left, column-offset
+<span id="L175" class="LineNr"> 175 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L176" class="LineNr"> 176 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L177" class="LineNr"> 177 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L178" class="LineNr"> 178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> wrap?
+<span id="L179" class="LineNr"> 179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> add left, end-of-line
+<span id="L180" class="LineNr"> 180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L181" class="LineNr"> 181 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L182" class="LineNr"> 182 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L183" class="LineNr"> 183 </span>  <span class="Delimiter">}</span>
 <span id="L184" class="LineNr"> 184 </span>  <span class="Comment"># case 2: if previous-character was not newline, we're just at a wrapped line</span>
 <span id="L185" class="LineNr"> 185 </span>  trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[wrapping to previous line]</span>
@@ -258,15 +259,15 @@ if ('onhashchange' in window) {
 <span id="L198" class="LineNr"> 198 </span>  at-start?:bool <span class="Special">&lt;-</span> equal curr, start
 <span id="L199" class="LineNr"> 199 </span>  <span class="muControl">return-if</span> at-start?
 <span id="L200" class="LineNr"> 200 </span>  <span class="Delimiter">{</span>
-<span id="L201" class="LineNr"> 201 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
-<span id="L202" class="LineNr"> 202 </span>    <span class="muControl">break-unless</span> curr
-<span id="L203" class="LineNr"> 203 </span>    at-start?:bool <span class="Special">&lt;-</span> equal curr, start
-<span id="L204" class="LineNr"> 204 </span>    <span class="muControl">break-if</span> at-start?
-<span id="L205" class="LineNr"> 205 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L206" class="LineNr"> 206 </span>    at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L207" class="LineNr"> 207 </span>    <span class="muControl">break-if</span> at-newline?
-<span id="L208" class="LineNr"> 208 </span>    result <span class="Special">&lt;-</span> add result,<span class="Constant"> 1</span>
-<span id="L209" class="LineNr"> 209 </span>    <span class="muControl">loop</span>
+<span id="L201" class="LineNr"> 201 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
+<span id="L202" class="LineNr"> 202 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L203" class="LineNr"> 203 </span>  <span class="Conceal">¦</span> at-start?:bool <span class="Special">&lt;-</span> equal curr, start
+<span id="L204" class="LineNr"> 204 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-start?
+<span id="L205" class="LineNr"> 205 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L206" class="LineNr"> 206 </span>  <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L207" class="LineNr"> 207 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L208" class="LineNr"> 208 </span>  <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> add result,<span class="Constant"> 1</span>
+<span id="L209" class="LineNr"> 209 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L210" class="LineNr"> 210 </span>  <span class="Delimiter">}</span>
 <span id="L211" class="LineNr"> 211 </span>]
 <span id="L212" class="LineNr"> 212 </span>
@@ -278,23 +279,23 @@ if ('onhashchange' in window) {
 <span id="L218" class="LineNr"> 218 </span><span class="Constant">cd]</span>
 <span id="L219" class="LineNr"> 219 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L220" class="LineNr"> 220 </span>  assume-console [
-<span id="L221" class="LineNr"> 221 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>  <span class="Comment"># cursor at only character in final line</span>
-<span id="L222" class="LineNr"> 222 </span>    press backspace
+<span id="L221" class="LineNr"> 221 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>  <span class="Comment"># cursor at only character in final line</span>
+<span id="L222" class="LineNr"> 222 </span>  <span class="Conceal">¦</span> press backspace
 <span id="L223" class="LineNr"> 223 </span>  ]
 <span id="L224" class="LineNr"> 224 </span>  run [
-<span id="L225" class="LineNr"> 225 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L226" class="LineNr"> 226 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L227" class="LineNr"> 227 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L225" class="LineNr"> 225 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L226" class="LineNr"> 226 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L227" class="LineNr"> 227 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L228" class="LineNr"> 228 </span>  ]
 <span id="L229" class="LineNr"> 229 </span>  screen-should-contain [
-<span id="L230" class="LineNr"> 230 </span>   <span class="Constant"> .          .</span>
-<span id="L231" class="LineNr"> 231 </span>   <span class="Constant"> .abcd      .</span>
-<span id="L232" class="LineNr"> 232 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L233" class="LineNr"> 233 </span>   <span class="Constant"> .          .</span>
+<span id="L230" class="LineNr"> 230 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L231" class="LineNr"> 231 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd      .</span>
+<span id="L232" class="LineNr"> 232 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L233" class="LineNr"> 233 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L234" class="LineNr"> 234 </span>  ]
 <span id="L235" class="LineNr"> 235 </span>  memory-should-contain [
-<span id="L236" class="LineNr"> 236 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L237" class="LineNr"> 237 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L236" class="LineNr"> 236 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L237" class="LineNr"> 237 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L238" class="LineNr"> 238 </span>  ]
 <span id="L239" class="LineNr"> 239 </span>]
 <span id="L240" class="LineNr"> 240 </span>
@@ -309,19 +310,19 @@ if ('onhashchange' in window) {
 <span id="L249" class="LineNr"> 249 </span>  $clear-trace
 <span id="L250" class="LineNr"> 250 </span>  <span class="Comment"># position the cursor at the start of the second and hit backspace</span>
 <span id="L251" class="LineNr"> 251 </span>  assume-console [
-<span id="L252" class="LineNr"> 252 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
-<span id="L253" class="LineNr"> 253 </span>    press backspace
+<span id="L252" class="LineNr"> 252 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
+<span id="L253" class="LineNr"> 253 </span>  <span class="Conceal">¦</span> press backspace
 <span id="L254" class="LineNr"> 254 </span>  ]
 <span id="L255" class="LineNr"> 255 </span>  run [
-<span id="L256" class="LineNr"> 256 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L256" class="LineNr"> 256 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L257" class="LineNr"> 257 </span>  ]
 <span id="L258" class="LineNr"> 258 </span>  <span class="Comment"># resulting single line should wrap correctly</span>
 <span id="L259" class="LineNr"> 259 </span>  screen-should-contain [
-<span id="L260" class="LineNr"> 260 </span>   <span class="Constant"> .          .</span>
-<span id="L261" class="LineNr"> 261 </span>   <span class="Constant"> .abc defgh↩.</span>
-<span id="L262" class="LineNr"> 262 </span>   <span class="Constant"> .i jkl     .</span>
-<span id="L263" class="LineNr"> 263 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L264" class="LineNr"> 264 </span>   <span class="Constant"> .          .</span>
+<span id="L260" class="LineNr"> 260 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L261" class="LineNr"> 261 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc defgh↩.</span>
+<span id="L262" class="LineNr"> 262 </span>  <span class="Conceal">¦</span><span class="Constant"> .i jkl     .</span>
+<span id="L263" class="LineNr"> 263 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L264" class="LineNr"> 264 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L265" class="LineNr"> 265 </span>  ]
 <span id="L266" class="LineNr"> 266 </span>]
 <span id="L267" class="LineNr"> 267 </span>
@@ -333,27 +334,27 @@ if ('onhashchange' in window) {
 <span id="L273" class="LineNr"> 273 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L274" class="LineNr"> 274 </span>  <span class="Comment"># confirm that it wraps</span>
 <span id="L275" class="LineNr"> 275 </span>  screen-should-contain [
-<span id="L276" class="LineNr"> 276 </span>   <span class="Constant"> .          .</span>
-<span id="L277" class="LineNr"> 277 </span>   <span class="Constant"> .abc def↩  .</span>
-<span id="L278" class="LineNr"> 278 </span>   <span class="Constant"> . ghij     .</span>
-<span id="L279" class="LineNr"> 279 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌  .</span>
+<span id="L276" class="LineNr"> 276 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L277" class="LineNr"> 277 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc def↩  .</span>
+<span id="L278" class="LineNr"> 278 </span>  <span class="Conceal">¦</span><span class="Constant"> . ghij     .</span>
+<span id="L279" class="LineNr"> 279 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌  .</span>
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 <span id="L281" class="LineNr"> 281 </span>  $clear-trace
 <span id="L282" class="LineNr"> 282 </span>  <span class="Comment"># position the cursor somewhere in the middle of the top screen line and hit backspace</span>
 <span id="L283" class="LineNr"> 283 </span>  assume-console [
-<span id="L284" class="LineNr"> 284 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span>
-<span id="L285" class="LineNr"> 285 </span>    press backspace
+<span id="L284" class="LineNr"> 284 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span>
+<span id="L285" class="LineNr"> 285 </span>  <span class="Conceal">¦</span> press backspace
 <span id="L286" class="LineNr"> 286 </span>  ]
 <span id="L287" class="LineNr"> 287 </span>  run [
-<span id="L288" class="LineNr"> 288 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L288" class="LineNr"> 288 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L289" class="LineNr"> 289 </span>  ]
 <span id="L290" class="LineNr"> 290 </span>  <span class="Comment"># resulting single line should wrap correctly and not overflow its bounds</span>
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-<span id="L292" class="LineNr"> 292 </span>   <span class="Constant"> .          .</span>
-<span id="L293" class="LineNr"> 293 </span>   <span class="Constant"> .abcdef ↩  .</span>
-<span id="L294" class="LineNr"> 294 </span>   <span class="Constant"> .ghij      .</span>
-<span id="L295" class="LineNr"> 295 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌  .</span>
-<span id="L296" class="LineNr"> 296 </span>   <span class="Constant"> .          .</span>
+<span id="L292" class="LineNr"> 292 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L293" class="LineNr"> 293 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcdef ↩  .</span>
+<span id="L294" class="LineNr"> 294 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghij      .</span>
+<span id="L295" class="LineNr"> 295 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌  .</span>
+<span id="L296" class="LineNr"> 296 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L297" class="LineNr"> 297 </span>  ]
 <span id="L298" class="LineNr"> 298 </span>]
 <span id="L299" class="LineNr"> 299 </span>
@@ -366,42 +367,42 @@ if ('onhashchange' in window) {
 <span id="L306" class="LineNr"> 306 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L307" class="LineNr"> 307 </span>  $clear-trace
 <span id="L308" class="LineNr"> 308 </span>  assume-console [
-<span id="L309" class="LineNr"> 309 </span>    press delete
+<span id="L309" class="LineNr"> 309 </span>  <span class="Conceal">¦</span> press delete
 <span id="L310" class="LineNr"> 310 </span>  ]
 <span id="L311" class="LineNr"> 311 </span>  run [
-<span id="L312" class="LineNr"> 312 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L312" class="LineNr"> 312 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L313" class="LineNr"> 313 </span>  ]
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-<span id="L315" class="LineNr"> 315 </span>   <span class="Constant"> .          .</span>
-<span id="L316" class="LineNr"> 316 </span>   <span class="Constant"> .bc        .</span>
-<span id="L317" class="LineNr"> 317 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L318" class="LineNr"> 318 </span>   <span class="Constant"> .          .</span>
+<span id="L315" class="LineNr"> 315 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L316" class="LineNr"> 316 </span>  <span class="Conceal">¦</span><span class="Constant"> .bc        .</span>
+<span id="L317" class="LineNr"> 317 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L318" class="LineNr"> 318 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L319" class="LineNr"> 319 </span>  ]
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 <span id="L321" class="LineNr"> 321 </span>  $clear-trace
 <span id="L322" class="LineNr"> 322 </span>  assume-console [
-<span id="L323" class="LineNr"> 323 </span>    press delete
+<span id="L323" class="LineNr"> 323 </span>  <span class="Conceal">¦</span> press delete
 <span id="L324" class="LineNr"> 324 </span>  ]
 <span id="L325" class="LineNr"> 325 </span>  run [
-<span id="L326" class="LineNr"> 326 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L326" class="LineNr"> 326 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L327" class="LineNr"> 327 </span>  ]
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-<span id="L329" class="LineNr"> 329 </span>   <span class="Constant"> .          .</span>
-<span id="L330" class="LineNr"> 330 </span>   <span class="Constant"> .c         .</span>
-<span id="L331" class="LineNr"> 331 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L332" class="LineNr"> 332 </span>   <span class="Constant"> .          .</span>
+<span id="L329" class="LineNr"> 329 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L330" class="LineNr"> 330 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L331" class="LineNr"> 331 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L332" class="LineNr"> 332 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L333" class="LineNr"> 333 </span>  ]
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 <span id="L335" class="LineNr"> 335 </span>]
 <span id="L336" class="LineNr"> 336 </span>
 <span id="L337" class="LineNr"> 337 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L338" class="LineNr"> 338 </span>  <span class="Delimiter">{</span>
-<span id="L339" class="LineNr"> 339 </span>    delete-next-character?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65522/delete</span>
-<span id="L340" class="LineNr"> 340 </span>    <span class="muControl">break-unless</span> delete-next-character?
-<span id="L341" class="LineNr"> 341 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L341'>&lt;delete-character-begin&gt;</a></span>
-<span id="L342" class="LineNr"> 342 </span>    go-render?:bool, deleted-cell:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L348'>delete-at-cursor</a> editor, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L343" class="LineNr"> 343 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L343'>&lt;delete-character-end&gt;</a></span>
-<span id="L344" class="LineNr"> 344 </span>    <span class="muControl">return</span>
+<span id="L339" class="LineNr"> 339 </span>  <span class="Conceal">¦</span> delete-next-character?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65522/delete</span>
+<span id="L340" class="LineNr"> 340 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> delete-next-character?
+<span id="L341" class="LineNr"> 341 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L341'>&lt;delete-character-begin&gt;</a></span>
+<span id="L342" class="LineNr"> 342 </span>  <span class="Conceal">¦</span> go-render?:bool, deleted-cell:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L348'>delete-at-cursor</a> editor, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L343" class="LineNr"> 343 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L343'>&lt;delete-character-end&gt;</a></span>
+<span id="L344" class="LineNr"> 344 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L345" class="LineNr"> 345 </span>  <span class="Delimiter">}</span>
 <span id="L346" class="LineNr"> 346 </span>]
 <span id="L347" class="LineNr"> 347 </span>
@@ -424,18 +425,18 @@ if ('onhashchange' in window) {
 <span id="L364" class="LineNr"> 364 </span>  curr-column:num <span class="Special">&lt;-</span> copy cursor-column
 <span id="L365" class="LineNr"> 365 </span>  <a href='../081print.mu.html#L581'>screen-width</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L581'>screen-width</a> <a href='../081print.mu.html#L4'>screen</a>
 <span id="L366" class="LineNr"> 366 </span>  <span class="Delimiter">{</span>
-<span id="L367" class="LineNr"> 367 </span>    <span class="Comment"># hit right margin? give up and let caller render</span>
-<span id="L368" class="LineNr"> 368 </span>    at-right?:bool <span class="Special">&lt;-</span> greater-or-equal curr-column, <a href='../081print.mu.html#L581'>screen-width</a>
-<span id="L369" class="LineNr"> 369 </span>    <span class="muControl">return-if</span> at-right?, <span class="Constant">1/go-render</span>
-<span id="L370" class="LineNr"> 370 </span>    <span class="muControl">break-unless</span> curr
-<span id="L371" class="LineNr"> 371 </span>    <span class="Comment"># newline? done.</span>
-<span id="L372" class="LineNr"> 372 </span>    currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L373" class="LineNr"> 373 </span>    at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
-<span id="L374" class="LineNr"> 374 </span>    <span class="muControl">break-if</span> at-newline?
-<span id="L375" class="LineNr"> 375 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='../081print.mu.html#L4'>screen</a>, currc
-<span id="L376" class="LineNr"> 376 </span>    curr-column <span class="Special">&lt;-</span> add curr-column,<span class="Constant"> 1</span>
-<span id="L377" class="LineNr"> 377 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L378" class="LineNr"> 378 </span>    <span class="muControl">loop</span>
+<span id="L367" class="LineNr"> 367 </span>  <span class="Conceal">¦</span> <span class="Comment"># hit right margin? give up and let caller render</span>
+<span id="L368" class="LineNr"> 368 </span>  <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> greater-or-equal curr-column, <a href='../081print.mu.html#L581'>screen-width</a>
+<span id="L369" class="LineNr"> 369 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> at-right?, <span class="Constant">1/go-render</span>
+<span id="L370" class="LineNr"> 370 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L371" class="LineNr"> 371 </span>  <span class="Conceal">¦</span> <span class="Comment"># newline? done.</span>
+<span id="L372" class="LineNr"> 372 </span>  <span class="Conceal">¦</span> currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L373" class="LineNr"> 373 </span>  <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
+<span id="L374" class="LineNr"> 374 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L375" class="LineNr"> 375 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='../081print.mu.html#L4'>screen</a>, currc
+<span id="L376" class="LineNr"> 376 </span>  <span class="Conceal">¦</span> curr-column <span class="Special">&lt;-</span> add curr-column,<span class="Constant"> 1</span>
+<span id="L377" class="LineNr"> 377 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L378" class="LineNr"> 378 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L379" class="LineNr"> 379 </span>  <span class="Delimiter">}</span>
 <span id="L380" class="LineNr"> 380 </span>  <span class="Comment"># we're guaranteed not to be at the right margin</span>
 <span id="L381" class="LineNr"> 381 </span>  space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
@@ -452,37 +453,37 @@ if ('onhashchange' in window) {
 <span id="L392" class="LineNr"> 392 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L393" class="LineNr"> 393 </span>  $clear-trace
 <span id="L394" class="LineNr"> 394 </span>  assume-console [
-<span id="L395" class="LineNr"> 395 </span>    press right-arrow
-<span id="L396" class="LineNr"> 396 </span>    type <span class="Constant">[0]</span>
+<span id="L395" class="LineNr"> 395 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L396" class="LineNr"> 396 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L397" class="LineNr"> 397 </span>  ]
 <span id="L398" class="LineNr"> 398 </span>  run [
-<span id="L399" class="LineNr"> 399 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L399" class="LineNr"> 399 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L400" class="LineNr"> 400 </span>  ]
 <span id="L401" class="LineNr"> 401 </span>  screen-should-contain [
-<span id="L402" class="LineNr"> 402 </span>   <span class="Constant"> .          .</span>
-<span id="L403" class="LineNr"> 403 </span>   <span class="Constant"> .a0bc      .</span>
-<span id="L404" class="LineNr"> 404 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L405" class="LineNr"> 405 </span>   <span class="Constant"> .          .</span>
+<span id="L402" class="LineNr"> 402 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L403" class="LineNr"> 403 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc      .</span>
+<span id="L404" class="LineNr"> 404 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L405" class="LineNr"> 405 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L406" class="LineNr"> 406 </span>  ]
 <span id="L407" class="LineNr"> 407 </span>  check-trace-count-for-label<span class="Constant"> 3</span>, <span class="Constant">[print-character]</span>  <span class="Comment"># 0 and following characters</span>
 <span id="L408" class="LineNr"> 408 </span>]
 <span id="L409" class="LineNr"> 409 </span>
 <span id="L410" class="LineNr"> 410 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L411" class="LineNr"> 411 </span>  <span class="Delimiter">{</span>
-<span id="L412" class="LineNr"> 412 </span>    move-to-next-character?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65514/right-arrow</span>
-<span id="L413" class="LineNr"> 413 </span>    <span class="muControl">break-unless</span> move-to-next-character?
-<span id="L414" class="LineNr"> 414 </span>    <span class="Comment"># if not at end of text</span>
-<span id="L415" class="LineNr"> 415 </span>    next-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L416" class="LineNr"> 416 </span>    <span class="muControl">break-unless</span> next-cursor
-<span id="L417" class="LineNr"> 417 </span>    <span class="Comment"># scan to next character</span>
-<span id="L418" class="LineNr"> 418 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L419" class="LineNr"> 419 </span>    before-cursor <span class="Special">&lt;-</span> copy next-cursor
-<span id="L420" class="LineNr"> 420 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L421" class="LineNr"> 421 </span>    go-render?:bool <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L429'>move-cursor-coordinates-right</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L422" class="LineNr"> 422 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
-<span id="L423" class="LineNr"> 423 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">2/right-arrow</span>
-<span id="L424" class="LineNr"> 424 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L425" class="LineNr"> 425 </span>    <span class="muControl">return</span>
+<span id="L412" class="LineNr"> 412 </span>  <span class="Conceal">¦</span> move-to-next-character?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65514/right-arrow</span>
+<span id="L413" class="LineNr"> 413 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-next-character?
+<span id="L414" class="LineNr"> 414 </span>  <span class="Conceal">¦</span> <span class="Comment"># if not at end of text</span>
+<span id="L415" class="LineNr"> 415 </span>  <span class="Conceal">¦</span> next-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L416" class="LineNr"> 416 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> next-cursor
+<span id="L417" class="LineNr"> 417 </span>  <span class="Conceal">¦</span> <span class="Comment"># scan to next character</span>
+<span id="L418" class="LineNr"> 418 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L419" class="LineNr"> 419 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy next-cursor
+<span id="L420" class="LineNr"> 420 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L421" class="LineNr"> 421 </span>  <span class="Conceal">¦</span> go-render?:bool <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L429'>move-cursor-coordinates-right</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L422" class="LineNr"> 422 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
+<span id="L423" class="LineNr"> 423 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">2/right-arrow</span>
+<span id="L424" class="LineNr"> 424 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L425" class="LineNr"> 425 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L426" class="LineNr"> 426 </span>  <span class="Delimiter">}</span>
 <span id="L427" class="LineNr"> 427 </span>]
 <span id="L428" class="LineNr"> 428 </span>
@@ -496,42 +497,42 @@ if ('onhashchange' in window) {
 <span id="L436" class="LineNr"> 436 </span>  right:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">right:offset</span>
 <span id="L437" class="LineNr"> 437 </span>  <span class="Comment"># if crossed a newline, move cursor to start of next row</span>
 <span id="L438" class="LineNr"> 438 </span>  <span class="Delimiter">{</span>
-<span id="L439" class="LineNr"> 439 </span>    old-cursor-character:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
-<span id="L440" class="LineNr"> 440 </span>    was-at-newline?:bool <span class="Special">&lt;-</span> equal old-cursor-character, <span class="Constant">10/newline</span>
-<span id="L441" class="LineNr"> 441 </span>    <span class="muControl">break-unless</span> was-at-newline?
-<span id="L442" class="LineNr"> 442 </span>    cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
-<span id="L443" class="LineNr"> 443 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L444" class="LineNr"> 444 </span>    cursor-column <span class="Special">&lt;-</span> copy left
-<span id="L445" class="LineNr"> 445 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L446" class="LineNr"> 446 </span>    below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>  <span class="Comment"># must be equal</span>
-<span id="L447" class="LineNr"> 447 </span>    <span class="muControl">return-unless</span> below-screen?, <span class="Constant">0/don't-render</span>
-<span id="L448" class="LineNr"> 448 </span><span class="Constant">    &lt;scroll-down&gt;</span>
-<span id="L449" class="LineNr"> 449 </span>    cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># bring back into screen range</span>
-<span id="L450" class="LineNr"> 450 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L451" class="LineNr"> 451 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L439" class="LineNr"> 439 </span>  <span class="Conceal">¦</span> old-cursor-character:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
+<span id="L440" class="LineNr"> 440 </span>  <span class="Conceal">¦</span> was-at-newline?:bool <span class="Special">&lt;-</span> equal old-cursor-character, <span class="Constant">10/newline</span>
+<span id="L441" class="LineNr"> 441 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> was-at-newline?
+<span id="L442" class="LineNr"> 442 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
+<span id="L443" class="LineNr"> 443 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L444" class="LineNr"> 444 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy left
+<span id="L445" class="LineNr"> 445 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L446" class="LineNr"> 446 </span>  <span class="Conceal">¦</span> below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>  <span class="Comment"># must be equal</span>
+<span id="L447" class="LineNr"> 447 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> below-screen?, <span class="Constant">0/don't-render</span>
+<span id="L448" class="LineNr"> 448 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;scroll-down&gt;</span>
+<span id="L449" class="LineNr"> 449 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># bring back into screen range</span>
+<span id="L450" class="LineNr"> 450 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L451" class="LineNr"> 451 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L452" class="LineNr"> 452 </span>  <span class="Delimiter">}</span>
 <span id="L453" class="LineNr"> 453 </span>  <span class="Comment"># if the line wraps, move cursor to start of next row</span>
 <span id="L454" class="LineNr"> 454 </span>  <span class="Delimiter">{</span>
-<span id="L455" class="LineNr"> 455 </span>    <span class="Comment"># if we're at the column just before the wrap indicator</span>
-<span id="L456" class="LineNr"> 456 </span>    wrap-column:num <span class="Special">&lt;-</span> subtract right,<span class="Constant"> 1</span>
-<span id="L457" class="LineNr"> 457 </span>    at-wrap?:bool <span class="Special">&lt;-</span> equal cursor-column, wrap-column
-<span id="L458" class="LineNr"> 458 </span>    <span class="muControl">break-unless</span> at-wrap?
-<span id="L459" class="LineNr"> 459 </span>    <span class="Comment"># and if next character isn't newline</span>
-<span id="L460" class="LineNr"> 460 </span>    <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L461" class="LineNr"> 461 </span>    <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>
-<span id="L462" class="LineNr"> 462 </span>    next-character:char <span class="Special">&lt;-</span> get *next, <span class="Constant">value:offset</span>
-<span id="L463" class="LineNr"> 463 </span>    newline?:bool <span class="Special">&lt;-</span> equal next-character, <span class="Constant">10/newline</span>
-<span id="L464" class="LineNr"> 464 </span>    <span class="muControl">break-if</span> newline?
-<span id="L465" class="LineNr"> 465 </span>    cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
-<span id="L466" class="LineNr"> 466 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L467" class="LineNr"> 467 </span>    cursor-column <span class="Special">&lt;-</span> copy left
-<span id="L468" class="LineNr"> 468 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L469" class="LineNr"> 469 </span>    below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>  <span class="Comment"># must be equal</span>
-<span id="L470" class="LineNr"> 470 </span>    <span class="muControl">return-unless</span> below-screen?, <span class="Constant">0/no-more-render</span>
-<span id="L471" class="LineNr"> 471 </span><span class="Constant">    &lt;scroll-down&gt;</span>
-<span id="L472" class="LineNr"> 472 </span>    cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># bring back into screen range</span>
-<span id="L473" class="LineNr"> 473 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L474" class="LineNr"> 474 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L455" class="LineNr"> 455 </span>  <span class="Conceal">¦</span> <span class="Comment"># if we're at the column just before the wrap indicator</span>
+<span id="L456" class="LineNr"> 456 </span>  <span class="Conceal">¦</span> wrap-column:num <span class="Special">&lt;-</span> subtract right,<span class="Constant"> 1</span>
+<span id="L457" class="LineNr"> 457 </span>  <span class="Conceal">¦</span> at-wrap?:bool <span class="Special">&lt;-</span> equal cursor-column, wrap-column
+<span id="L458" class="LineNr"> 458 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-wrap?
+<span id="L459" class="LineNr"> 459 </span>  <span class="Conceal">¦</span> <span class="Comment"># and if next character isn't newline</span>
+<span id="L460" class="LineNr"> 460 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L461" class="LineNr"> 461 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>
+<span id="L462" class="LineNr"> 462 </span>  <span class="Conceal">¦</span> next-character:char <span class="Special">&lt;-</span> get *next, <span class="Constant">value:offset</span>
+<span id="L463" class="LineNr"> 463 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal next-character, <span class="Constant">10/newline</span>
+<span id="L464" class="LineNr"> 464 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> newline?
+<span id="L465" class="LineNr"> 465 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
+<span id="L466" class="LineNr"> 466 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L467" class="LineNr"> 467 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy left
+<span id="L468" class="LineNr"> 468 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L469" class="LineNr"> 469 </span>  <span class="Conceal">¦</span> below-screen?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, <a href='../081print.mu.html#L594'>screen-height</a>  <span class="Comment"># must be equal</span>
+<span id="L470" class="LineNr"> 470 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> below-screen?, <span class="Constant">0/no-more-render</span>
+<span id="L471" class="LineNr"> 471 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;scroll-down&gt;</span>
+<span id="L472" class="LineNr"> 472 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> subtract cursor-row,<span class="Constant"> 1</span>  <span class="Comment"># bring back into screen range</span>
+<span id="L473" class="LineNr"> 473 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L474" class="LineNr"> 474 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L475" class="LineNr"> 475 </span>  <span class="Delimiter">}</span>
 <span id="L476" class="LineNr"> 476 </span>  <span class="Comment"># otherwise move cursor one character right</span>
 <span id="L477" class="LineNr"> 477 </span>  cursor-column <span class="Special">&lt;-</span> add cursor-column,<span class="Constant"> 1</span>
@@ -549,28 +550,28 @@ if ('onhashchange' in window) {
 <span id="L489" class="LineNr"> 489 </span>  $clear-trace
 <span id="L490" class="LineNr"> 490 </span>  <span class="Comment"># type right-arrow a few times to get to start of second line</span>
 <span id="L491" class="LineNr"> 491 </span>  assume-console [
-<span id="L492" class="LineNr"> 492 </span>    press right-arrow
-<span id="L493" class="LineNr"> 493 </span>    press right-arrow
-<span id="L494" class="LineNr"> 494 </span>    press right-arrow
-<span id="L495" class="LineNr"> 495 </span>    press right-arrow  <span class="Comment"># next line</span>
+<span id="L492" class="LineNr"> 492 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L493" class="LineNr"> 493 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L494" class="LineNr"> 494 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L495" class="LineNr"> 495 </span>  <span class="Conceal">¦</span> press right-arrow  <span class="Comment"># next line</span>
 <span id="L496" class="LineNr"> 496 </span>  ]
 <span id="L497" class="LineNr"> 497 </span>  run [
-<span id="L498" class="LineNr"> 498 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L498" class="LineNr"> 498 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L499" class="LineNr"> 499 </span>  ]
 <span id="L500" class="LineNr"> 500 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L501" class="LineNr"> 501 </span>  <span class="Comment"># type something and ensure it goes where it should</span>
 <span id="L502" class="LineNr"> 502 </span>  assume-console [
-<span id="L503" class="LineNr"> 503 </span>    type <span class="Constant">[0]</span>
+<span id="L503" class="LineNr"> 503 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L504" class="LineNr"> 504 </span>  ]
 <span id="L505" class="LineNr"> 505 </span>  run [
-<span id="L506" class="LineNr"> 506 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L506" class="LineNr"> 506 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L507" class="LineNr"> 507 </span>  ]
 <span id="L508" class="LineNr"> 508 </span>  screen-should-contain [
-<span id="L509" class="LineNr"> 509 </span>   <span class="Constant"> .          .</span>
-<span id="L510" class="LineNr"> 510 </span>   <span class="Constant"> .abc       .</span>
-<span id="L511" class="LineNr"> 511 </span>   <span class="Constant"> .0d        .</span>
-<span id="L512" class="LineNr"> 512 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L513" class="LineNr"> 513 </span>   <span class="Constant"> .          .</span>
+<span id="L509" class="LineNr"> 509 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L510" class="LineNr"> 510 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L511" class="LineNr"> 511 </span>  <span class="Conceal">¦</span><span class="Constant"> .0d        .</span>
+<span id="L512" class="LineNr"> 512 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L513" class="LineNr"> 513 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L514" class="LineNr"> 514 </span>  ]
 <span id="L515" class="LineNr"> 515 </span>  check-trace-count-for-label<span class="Constant"> 2</span>, <span class="Constant">[print-character]</span>  <span class="Comment"># new length of second line</span>
 <span id="L516" class="LineNr"> 516 </span>]
@@ -583,21 +584,21 @@ if ('onhashchange' in window) {
 <span id="L523" class="LineNr"> 523 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">1/left</span>, <span class="Constant">10/right</span>
 <span id="L524" class="LineNr"> 524 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L525" class="LineNr"> 525 </span>  assume-console [
-<span id="L526" class="LineNr"> 526 </span>    press right-arrow
-<span id="L527" class="LineNr"> 527 </span>    press right-arrow
-<span id="L528" class="LineNr"> 528 </span>    press right-arrow
-<span id="L529" class="LineNr"> 529 </span>    press right-arrow  <span class="Comment"># next line</span>
-<span id="L530" class="LineNr"> 530 </span>    type <span class="Constant">[0]</span>
+<span id="L526" class="LineNr"> 526 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L527" class="LineNr"> 527 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L528" class="LineNr"> 528 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L529" class="LineNr"> 529 </span>  <span class="Conceal">¦</span> press right-arrow  <span class="Comment"># next line</span>
+<span id="L530" class="LineNr"> 530 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L531" class="LineNr"> 531 </span>  ]
 <span id="L532" class="LineNr"> 532 </span>  run [
-<span id="L533" class="LineNr"> 533 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L533" class="LineNr"> 533 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L534" class="LineNr"> 534 </span>  ]
 <span id="L535" class="LineNr"> 535 </span>  screen-should-contain [
-<span id="L536" class="LineNr"> 536 </span>   <span class="Constant"> .          .</span>
-<span id="L537" class="LineNr"> 537 </span>   <span class="Constant"> . abc      .</span>
-<span id="L538" class="LineNr"> 538 </span>   <span class="Constant"> . 0d       .</span>
-<span id="L539" class="LineNr"> 539 </span>   <span class="Constant"> . ╌╌╌╌╌╌╌╌╌.</span>
-<span id="L540" class="LineNr"> 540 </span>   <span class="Constant"> .          .</span>
+<span id="L536" class="LineNr"> 536 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L537" class="LineNr"> 537 </span>  <span class="Conceal">¦</span><span class="Constant"> . abc      .</span>
+<span id="L538" class="LineNr"> 538 </span>  <span class="Conceal">¦</span><span class="Constant"> . 0d       .</span>
+<span id="L539" class="LineNr"> 539 </span>  <span class="Conceal">¦</span><span class="Constant"> . ╌╌╌╌╌╌╌╌╌.</span>
+<span id="L540" class="LineNr"> 540 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L541" class="LineNr"> 541 </span>  ]
 <span id="L542" class="LineNr"> 542 </span>]
 <span id="L543" class="LineNr"> 543 </span>
@@ -608,24 +609,24 @@ if ('onhashchange' in window) {
 <span id="L548" class="LineNr"> 548 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L549" class="LineNr"> 549 </span>  $clear-trace
 <span id="L550" class="LineNr"> 550 </span>  assume-console [
-<span id="L551" class="LineNr"> 551 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L552" class="LineNr"> 552 </span>    press right-arrow
+<span id="L551" class="LineNr"> 551 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L552" class="LineNr"> 552 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L553" class="LineNr"> 553 </span>  ]
 <span id="L554" class="LineNr"> 554 </span>  run [
-<span id="L555" class="LineNr"> 555 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L556" class="LineNr"> 556 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L557" class="LineNr"> 557 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L555" class="LineNr"> 555 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L556" class="LineNr"> 556 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L557" class="LineNr"> 557 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L558" class="LineNr"> 558 </span>  ]
 <span id="L559" class="LineNr"> 559 </span>  screen-should-contain [
-<span id="L560" class="LineNr"> 560 </span>   <span class="Constant"> .          .</span>
-<span id="L561" class="LineNr"> 561 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L562" class="LineNr"> 562 </span>   <span class="Constant"> .ef        .</span>
-<span id="L563" class="LineNr"> 563 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L564" class="LineNr"> 564 </span>   <span class="Constant"> .          .</span>
+<span id="L560" class="LineNr"> 560 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L561" class="LineNr"> 561 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L562" class="LineNr"> 562 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L563" class="LineNr"> 563 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L564" class="LineNr"> 564 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L565" class="LineNr"> 565 </span>  ]
 <span id="L566" class="LineNr"> 566 </span>  memory-should-contain [
-<span id="L567" class="LineNr"> 567 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L568" class="LineNr"> 568 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L567" class="LineNr"> 567 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L568" class="LineNr"> 568 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L569" class="LineNr"> 569 </span>  ]
 <span id="L570" class="LineNr"> 570 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L571" class="LineNr"> 571 </span>]
@@ -639,30 +640,30 @@ if ('onhashchange' in window) {
 <span id="L579" class="LineNr"> 579 </span>  $clear-trace
 <span id="L580" class="LineNr"> 580 </span>  <span class="Comment"># position cursor at last character before wrap and hit right-arrow</span>
 <span id="L581" class="LineNr"> 581 </span>  assume-console [
-<span id="L582" class="LineNr"> 582 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L583" class="LineNr"> 583 </span>    press right-arrow
+<span id="L582" class="LineNr"> 582 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L583" class="LineNr"> 583 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L584" class="LineNr"> 584 </span>  ]
 <span id="L585" class="LineNr"> 585 </span>  run [
-<span id="L586" class="LineNr"> 586 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L587" class="LineNr"> 587 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L588" class="LineNr"> 588 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L586" class="LineNr"> 586 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L587" class="LineNr"> 587 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L588" class="LineNr"> 588 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L589" class="LineNr"> 589 </span>  ]
 <span id="L590" class="LineNr"> 590 </span>  memory-should-contain [
-<span id="L591" class="LineNr"> 591 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L592" class="LineNr"> 592 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L591" class="LineNr"> 591 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L592" class="LineNr"> 592 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L593" class="LineNr"> 593 </span>  ]
 <span id="L594" class="LineNr"> 594 </span>  <span class="Comment"># now hit right arrow again</span>
 <span id="L595" class="LineNr"> 595 </span>  assume-console [
-<span id="L596" class="LineNr"> 596 </span>    press right-arrow
+<span id="L596" class="LineNr"> 596 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L597" class="LineNr"> 597 </span>  ]
 <span id="L598" class="LineNr"> 598 </span>  run [
-<span id="L599" class="LineNr"> 599 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L600" class="LineNr"> 600 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L601" class="LineNr"> 601 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L599" class="LineNr"> 599 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L600" class="LineNr"> 600 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L601" class="LineNr"> 601 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L602" class="LineNr"> 602 </span>  ]
 <span id="L603" class="LineNr"> 603 </span>  memory-should-contain [
-<span id="L604" class="LineNr"> 604 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L605" class="LineNr"> 605 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L604" class="LineNr"> 604 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L605" class="LineNr"> 605 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L606" class="LineNr"> 606 </span>  ]
 <span id="L607" class="LineNr"> 607 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L608" class="LineNr"> 608 </span>]
@@ -674,24 +675,24 @@ if ('onhashchange' in window) {
 <span id="L614" class="LineNr"> 614 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L615" class="LineNr"> 615 </span>  $clear-trace
 <span id="L616" class="LineNr"> 616 </span>  assume-console [
-<span id="L617" class="LineNr"> 617 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span>
-<span id="L618" class="LineNr"> 618 </span>    press right-arrow
+<span id="L617" class="LineNr"> 617 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 4</span>
+<span id="L618" class="LineNr"> 618 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L619" class="LineNr"> 619 </span>  ]
 <span id="L620" class="LineNr"> 620 </span>  run [
-<span id="L621" class="LineNr"> 621 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L622" class="LineNr"> 622 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L623" class="LineNr"> 623 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L621" class="LineNr"> 621 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L622" class="LineNr"> 622 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L623" class="LineNr"> 623 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L624" class="LineNr"> 624 </span>  ]
 <span id="L625" class="LineNr"> 625 </span>  screen-should-contain [
-<span id="L626" class="LineNr"> 626 </span>   <span class="Constant"> .          .</span>
-<span id="L627" class="LineNr"> 627 </span>   <span class="Constant"> . abcd↩    .</span>
-<span id="L628" class="LineNr"> 628 </span>   <span class="Constant"> . ef       .</span>
-<span id="L629" class="LineNr"> 629 </span>   <span class="Constant"> . ╌╌╌╌╌    .</span>
-<span id="L630" class="LineNr"> 630 </span>   <span class="Constant"> .          .</span>
+<span id="L626" class="LineNr"> 626 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L627" class="LineNr"> 627 </span>  <span class="Conceal">¦</span><span class="Constant"> . abcd↩    .</span>
+<span id="L628" class="LineNr"> 628 </span>  <span class="Conceal">¦</span><span class="Constant"> . ef       .</span>
+<span id="L629" class="LineNr"> 629 </span>  <span class="Conceal">¦</span><span class="Constant"> . ╌╌╌╌╌    .</span>
+<span id="L630" class="LineNr"> 630 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L631" class="LineNr"> 631 </span>  ]
 <span id="L632" class="LineNr"> 632 </span>  memory-should-contain [
-<span id="L633" class="LineNr"> 633 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L634" class="LineNr"> 634 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L633" class="LineNr"> 633 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L634" class="LineNr"> 634 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L635" class="LineNr"> 635 </span>  ]
 <span id="L636" class="LineNr"> 636 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L637" class="LineNr"> 637 </span>]
@@ -706,20 +707,20 @@ if ('onhashchange' in window) {
 <span id="L646" class="LineNr"> 646 </span>  $clear-trace
 <span id="L647" class="LineNr"> 647 </span>  <span class="Comment"># move to end of line, press right-arrow, type a character</span>
 <span id="L648" class="LineNr"> 648 </span>  assume-console [
-<span id="L649" class="LineNr"> 649 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L650" class="LineNr"> 650 </span>    press right-arrow
-<span id="L651" class="LineNr"> 651 </span>    type <span class="Constant">[0]</span>
+<span id="L649" class="LineNr"> 649 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L650" class="LineNr"> 650 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L651" class="LineNr"> 651 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L652" class="LineNr"> 652 </span>  ]
 <span id="L653" class="LineNr"> 653 </span>  run [
-<span id="L654" class="LineNr"> 654 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L654" class="LineNr"> 654 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L655" class="LineNr"> 655 </span>  ]
 <span id="L656" class="LineNr"> 656 </span>  <span class="Comment"># new character should be in next line</span>
 <span id="L657" class="LineNr"> 657 </span>  screen-should-contain [
-<span id="L658" class="LineNr"> 658 </span>   <span class="Constant"> .          .</span>
-<span id="L659" class="LineNr"> 659 </span>   <span class="Constant"> .abc       .</span>
-<span id="L660" class="LineNr"> 660 </span>   <span class="Constant"> .0d        .</span>
-<span id="L661" class="LineNr"> 661 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L662" class="LineNr"> 662 </span>   <span class="Constant"> .          .</span>
+<span id="L658" class="LineNr"> 658 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L659" class="LineNr"> 659 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L660" class="LineNr"> 660 </span>  <span class="Conceal">¦</span><span class="Constant"> .0d        .</span>
+<span id="L661" class="LineNr"> 661 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L662" class="LineNr"> 662 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L663" class="LineNr"> 663 </span>  ]
 <span id="L664" class="LineNr"> 664 </span>  check-trace-count-for-label<span class="Constant"> 2</span>, <span class="Constant">[print-character]</span>
 <span id="L665" class="LineNr"> 665 </span>]
@@ -735,37 +736,37 @@ if ('onhashchange' in window) {
 <span id="L675" class="LineNr"> 675 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L676" class="LineNr"> 676 </span>  $clear-trace
 <span id="L677" class="LineNr"> 677 </span>  assume-console [
-<span id="L678" class="LineNr"> 678 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L679" class="LineNr"> 679 </span>    press left-arrow
-<span id="L680" class="LineNr"> 680 </span>    type <span class="Constant">[0]</span>
+<span id="L678" class="LineNr"> 678 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L679" class="LineNr"> 679 </span>  <span class="Conceal">¦</span> press left-arrow
+<span id="L680" class="LineNr"> 680 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L681" class="LineNr"> 681 </span>  ]
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+<span id="L683" class="LineNr"> 683 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L684" class="LineNr"> 684 </span>  ]
 <span id="L685" class="LineNr"> 685 </span>  screen-should-contain [
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-<span id="L687" class="LineNr"> 687 </span>   <span class="Constant"> .a0bc      .</span>
-<span id="L688" class="LineNr"> 688 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L689" class="LineNr"> 689 </span>   <span class="Constant"> .          .</span>
+<span id="L686" class="LineNr"> 686 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L687" class="LineNr"> 687 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc      .</span>
+<span id="L688" class="LineNr"> 688 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L689" class="LineNr"> 689 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L690" class="LineNr"> 690 </span>  ]
 <span id="L691" class="LineNr"> 691 </span>  check-trace-count-for-label<span class="Constant"> 3</span>, <span class="Constant">[print-character]</span>
 <span id="L692" class="LineNr"> 692 </span>]
 <span id="L693" class="LineNr"> 693 </span>
 <span id="L694" class="LineNr"> 694 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L695" class="LineNr"> 695 </span>  <span class="Delimiter">{</span>
-<span id="L696" class="LineNr"> 696 </span>    move-to-previous-character?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65515/left-arrow</span>
-<span id="L697" class="LineNr"> 697 </span>    <span class="muControl">break-unless</span> move-to-previous-character?
-<span id="L698" class="LineNr"> 698 </span>    trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[left arrow]</span>
-<span id="L699" class="LineNr"> 699 </span>    <span class="Comment"># if not at start of text (before-cursor at § sentinel)</span>
-<span id="L700" class="LineNr"> 700 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
-<span id="L701" class="LineNr"> 701 </span>    <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>, <span class="Constant">0/don't-render</span>
-<span id="L702" class="LineNr"> 702 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L703" class="LineNr"> 703 </span>    go-render? <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L130'>move-cursor-coordinates-left</a> editor
-<span id="L704" class="LineNr"> 704 </span>    before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L705" class="LineNr"> 705 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L706" class="LineNr"> 706 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">1/left-arrow</span>
-<span id="L707" class="LineNr"> 707 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L708" class="LineNr"> 708 </span>    <span class="muControl">return</span>
+<span id="L696" class="LineNr"> 696 </span>  <span class="Conceal">¦</span> move-to-previous-character?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65515/left-arrow</span>
+<span id="L697" class="LineNr"> 697 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-previous-character?
+<span id="L698" class="LineNr"> 698 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[left arrow]</span>
+<span id="L699" class="LineNr"> 699 </span>  <span class="Conceal">¦</span> <span class="Comment"># if not at start of text (before-cursor at § sentinel)</span>
+<span id="L700" class="LineNr"> 700 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
+<span id="L701" class="LineNr"> 701 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>, <span class="Constant">0/don't-render</span>
+<span id="L702" class="LineNr"> 702 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L703" class="LineNr"> 703 </span>  <span class="Conceal">¦</span> go-render? <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L130'>move-cursor-coordinates-left</a> editor
+<span id="L704" class="LineNr"> 704 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L705" class="LineNr"> 705 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L706" class="LineNr"> 706 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">1/left-arrow</span>
+<span id="L707" class="LineNr"> 707 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L708" class="LineNr"> 708 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
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 <span id="L710" class="LineNr"> 710 </span>]
 <span id="L711" class="LineNr"> 711 </span>
@@ -780,17 +781,17 @@ if ('onhashchange' in window) {
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 <span id="L721" class="LineNr"> 721 </span>  <span class="Comment"># position cursor at start of second line (so there's no previous newline)</span>
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-<span id="L724" class="LineNr"> 724 </span>    press left-arrow
+<span id="L723" class="LineNr"> 723 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
+<span id="L724" class="LineNr"> 724 </span>  <span class="Conceal">¦</span> press left-arrow
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-<span id="L728" class="LineNr"> 728 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L729" class="LineNr"> 729 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L727" class="LineNr"> 727 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L728" class="LineNr"> 728 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L729" class="LineNr"> 729 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L730" class="LineNr"> 730 </span>  ]
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-<span id="L732" class="LineNr"> 732 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L733" class="LineNr"> 733 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L732" class="LineNr"> 732 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L733" class="LineNr"> 733 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
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 <span id="L735" class="LineNr"> 735 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L736" class="LineNr"> 736 </span>]
@@ -808,19 +809,19 @@ if ('onhashchange' in window) {
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 <span id="L749" class="LineNr"> 749 </span>  <span class="Comment"># the cursor)</span>
 <span id="L750" class="LineNr"> 750 </span>  assume-console [
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-<span id="L752" class="LineNr"> 752 </span>    press left-arrow
-<span id="L753" class="LineNr"> 753 </span>    type <span class="Constant">[0]</span>
+<span id="L751" class="LineNr"> 751 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L752" class="LineNr"> 752 </span>  <span class="Conceal">¦</span> press left-arrow
+<span id="L753" class="LineNr"> 753 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L754" class="LineNr"> 754 </span>  ]
 <span id="L755" class="LineNr"> 755 </span>  run [
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+<span id="L756" class="LineNr"> 756 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L757" class="LineNr"> 757 </span>  ]
 <span id="L758" class="LineNr"> 758 </span>  screen-should-contain [
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-<span id="L760" class="LineNr"> 760 </span>   <span class="Constant"> .abc       .</span>
-<span id="L761" class="LineNr"> 761 </span>   <span class="Constant"> .def0      .</span>
-<span id="L762" class="LineNr"> 762 </span>   <span class="Constant"> .g         .</span>
-<span id="L763" class="LineNr"> 763 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L759" class="LineNr"> 759 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L760" class="LineNr"> 760 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L761" class="LineNr"> 761 </span>  <span class="Conceal">¦</span><span class="Constant"> .def0      .</span>
+<span id="L762" class="LineNr"> 762 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L763" class="LineNr"> 763 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
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 <span id="L766" class="LineNr"> 766 </span>]
@@ -836,20 +837,20 @@ if ('onhashchange' in window) {
 <span id="L776" class="LineNr"> 776 </span>  $clear-trace
 <span id="L777" class="LineNr"> 777 </span>  <span class="Comment"># position cursor at start of text, press left-arrow, then type a character</span>
 <span id="L778" class="LineNr"> 778 </span>  assume-console [
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-<span id="L780" class="LineNr"> 780 </span>    press left-arrow
-<span id="L781" class="LineNr"> 781 </span>    type <span class="Constant">[0]</span>
+<span id="L779" class="LineNr"> 779 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 0</span>
+<span id="L780" class="LineNr"> 780 </span>  <span class="Conceal">¦</span> press left-arrow
+<span id="L781" class="LineNr"> 781 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L782" class="LineNr"> 782 </span>  ]
 <span id="L783" class="LineNr"> 783 </span>  run [
-<span id="L784" class="LineNr"> 784 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L784" class="LineNr"> 784 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L785" class="LineNr"> 785 </span>  ]
 <span id="L786" class="LineNr"> 786 </span>  <span class="Comment"># left-arrow should have had no effect</span>
 <span id="L787" class="LineNr"> 787 </span>  screen-should-contain [
-<span id="L788" class="LineNr"> 788 </span>   <span class="Constant"> .          .</span>
-<span id="L789" class="LineNr"> 789 </span>   <span class="Constant"> .0abc      .</span>
-<span id="L790" class="LineNr"> 790 </span>   <span class="Constant"> .def       .</span>
-<span id="L791" class="LineNr"> 791 </span>   <span class="Constant"> .g         .</span>
-<span id="L792" class="LineNr"> 792 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L788" class="LineNr"> 788 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L789" class="LineNr"> 789 </span>  <span class="Conceal">¦</span><span class="Constant"> .0abc      .</span>
+<span id="L790" class="LineNr"> 790 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L791" class="LineNr"> 791 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L792" class="LineNr"> 792 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L793" class="LineNr"> 793 </span>  ]
 <span id="L794" class="LineNr"> 794 </span>  check-trace-count-for-label<span class="Constant"> 4</span>, <span class="Constant">[print-character]</span>  <span class="Comment"># length of first line</span>
 <span id="L795" class="LineNr"> 795 </span>]
@@ -866,19 +867,19 @@ if ('onhashchange' in window) {
 <span id="L806" class="LineNr"> 806 </span>  $clear-trace
 <span id="L807" class="LineNr"> 807 </span>  <span class="Comment"># position cursor right after empty line</span>
 <span id="L808" class="LineNr"> 808 </span>  assume-console [
-<span id="L809" class="LineNr"> 809 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L810" class="LineNr"> 810 </span>    press left-arrow
-<span id="L811" class="LineNr"> 811 </span>    type <span class="Constant">[0]</span>
+<span id="L809" class="LineNr"> 809 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L810" class="LineNr"> 810 </span>  <span class="Conceal">¦</span> press left-arrow
+<span id="L811" class="LineNr"> 811 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L812" class="LineNr"> 812 </span>  ]
 <span id="L813" class="LineNr"> 813 </span>  run [
-<span id="L814" class="LineNr"> 814 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L814" class="LineNr"> 814 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L815" class="LineNr"> 815 </span>  ]
 <span id="L816" class="LineNr"> 816 </span>  screen-should-contain [
-<span id="L817" class="LineNr"> 817 </span>   <span class="Constant"> .          .</span>
-<span id="L818" class="LineNr"> 818 </span>   <span class="Constant"> .abc       .</span>
-<span id="L819" class="LineNr"> 819 </span>   <span class="Constant"> .0         .</span>
-<span id="L820" class="LineNr"> 820 </span>   <span class="Constant"> .d         .</span>
-<span id="L821" class="LineNr"> 821 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L817" class="LineNr"> 817 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L818" class="LineNr"> 818 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L819" class="LineNr"> 819 </span>  <span class="Conceal">¦</span><span class="Constant"> .0         .</span>
+<span id="L820" class="LineNr"> 820 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L821" class="LineNr"> 821 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L822" class="LineNr"> 822 </span>  ]
 <span id="L823" class="LineNr"> 823 </span>  check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>  <span class="Comment"># just the '0'</span>
 <span id="L824" class="LineNr"> 824 </span>]
@@ -891,25 +892,25 @@ if ('onhashchange' in window) {
 <span id="L831" class="LineNr"> 831 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L832" class="LineNr"> 832 </span>  $clear-trace
 <span id="L833" class="LineNr"> 833 </span>  screen-should-contain [
-<span id="L834" class="LineNr"> 834 </span>   <span class="Constant"> .          .</span>
-<span id="L835" class="LineNr"> 835 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L836" class="LineNr"> 836 </span>   <span class="Constant"> .ef        .</span>
-<span id="L837" class="LineNr"> 837 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L838" class="LineNr"> 838 </span>   <span class="Constant"> .          .</span>
+<span id="L834" class="LineNr"> 834 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L835" class="LineNr"> 835 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L836" class="LineNr"> 836 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L837" class="LineNr"> 837 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L838" class="LineNr"> 838 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L839" class="LineNr"> 839 </span>  ]
 <span id="L840" class="LineNr"> 840 </span>  <span class="Comment"># position cursor right after empty line</span>
 <span id="L841" class="LineNr"> 841 </span>  assume-console [
-<span id="L842" class="LineNr"> 842 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
-<span id="L843" class="LineNr"> 843 </span>    press left-arrow
+<span id="L842" class="LineNr"> 842 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
+<span id="L843" class="LineNr"> 843 </span>  <span class="Conceal">¦</span> press left-arrow
 <span id="L844" class="LineNr"> 844 </span>  ]
 <span id="L845" class="LineNr"> 845 </span>  run [
-<span id="L846" class="LineNr"> 846 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L847" class="LineNr"> 847 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L848" class="LineNr"> 848 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L846" class="LineNr"> 846 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L847" class="LineNr"> 847 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L848" class="LineNr"> 848 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L849" class="LineNr"> 849 </span>  ]
 <span id="L850" class="LineNr"> 850 </span>  memory-should-contain [
-<span id="L851" class="LineNr"> 851 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># previous row</span>
-<span id="L852" class="LineNr"> 852 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># right margin except wrap icon</span>
+<span id="L851" class="LineNr"> 851 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># previous row</span>
+<span id="L852" class="LineNr"> 852 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>  <span class="Comment"># right margin except wrap icon</span>
 <span id="L853" class="LineNr"> 853 </span>  ]
 <span id="L854" class="LineNr"> 854 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L855" class="LineNr"> 855 </span>]
@@ -924,25 +925,25 @@ if ('onhashchange' in window) {
 <span id="L864" class="LineNr"> 864 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L865" class="LineNr"> 865 </span>  $clear-trace
 <span id="L866" class="LineNr"> 866 </span>  screen-should-contain [
-<span id="L867" class="LineNr"> 867 </span>   <span class="Constant"> .          .</span>
-<span id="L868" class="LineNr"> 868 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L869" class="LineNr"> 869 </span>   <span class="Constant"> .ef        .</span>
-<span id="L870" class="LineNr"> 870 </span>   <span class="Constant"> .g         .</span>
-<span id="L871" class="LineNr"> 871 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L867" class="LineNr"> 867 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L868" class="LineNr"> 868 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L869" class="LineNr"> 869 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L870" class="LineNr"> 870 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L871" class="LineNr"> 871 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
 <span id="L872" class="LineNr"> 872 </span>  ]
 <span id="L873" class="LineNr"> 873 </span>  <span class="Comment"># position cursor right after empty line</span>
 <span id="L874" class="LineNr"> 874 </span>  assume-console [
-<span id="L875" class="LineNr"> 875 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L876" class="LineNr"> 876 </span>    press left-arrow
+<span id="L875" class="LineNr"> 875 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L876" class="LineNr"> 876 </span>  <span class="Conceal">¦</span> press left-arrow
 <span id="L877" class="LineNr"> 877 </span>  ]
 <span id="L878" class="LineNr"> 878 </span>  run [
-<span id="L879" class="LineNr"> 879 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L880" class="LineNr"> 880 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L881" class="LineNr"> 881 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L879" class="LineNr"> 879 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L880" class="LineNr"> 880 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L881" class="LineNr"> 881 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L882" class="LineNr"> 882 </span>  ]
 <span id="L883" class="LineNr"> 883 </span>  memory-should-contain [
-<span id="L884" class="LineNr"> 884 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># previous row</span>
-<span id="L885" class="LineNr"> 885 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># end of wrapped line</span>
+<span id="L884" class="LineNr"> 884 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># previous row</span>
+<span id="L885" class="LineNr"> 885 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># end of wrapped line</span>
 <span id="L886" class="LineNr"> 886 </span>  ]
 <span id="L887" class="LineNr"> 887 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L888" class="LineNr"> 888 </span>]
@@ -957,25 +958,25 @@ if ('onhashchange' in window) {
 <span id="L897" class="LineNr"> 897 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L898" class="LineNr"> 898 </span>  $clear-trace
 <span id="L899" class="LineNr"> 899 </span>  screen-should-contain [
-<span id="L900" class="LineNr"> 900 </span>   <span class="Constant"> .          .</span>
-<span id="L901" class="LineNr"> 901 </span>   <span class="Constant"> .abcd      .</span>
-<span id="L902" class="LineNr"> 902 </span>   <span class="Constant"> .e         .</span>
-<span id="L903" class="LineNr"> 903 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
-<span id="L904" class="LineNr"> 904 </span>   <span class="Constant"> .          .</span>
+<span id="L900" class="LineNr"> 900 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L901" class="LineNr"> 901 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd      .</span>
+<span id="L902" class="LineNr"> 902 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L903" class="LineNr"> 903 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L904" class="LineNr"> 904 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L905" class="LineNr"> 905 </span>  ]
 <span id="L906" class="LineNr"> 906 </span>  <span class="Comment"># position cursor right after empty line</span>
 <span id="L907" class="LineNr"> 907 </span>  assume-console [
-<span id="L908" class="LineNr"> 908 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
-<span id="L909" class="LineNr"> 909 </span>    press left-arrow
+<span id="L908" class="LineNr"> 908 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
+<span id="L909" class="LineNr"> 909 </span>  <span class="Conceal">¦</span> press left-arrow
 <span id="L910" class="LineNr"> 910 </span>  ]
 <span id="L911" class="LineNr"> 911 </span>  run [
-<span id="L912" class="LineNr"> 912 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L913" class="LineNr"> 913 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L914" class="LineNr"> 914 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L912" class="LineNr"> 912 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L913" class="LineNr"> 913 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L914" class="LineNr"> 914 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L915" class="LineNr"> 915 </span>  ]
 <span id="L916" class="LineNr"> 916 </span>  memory-should-contain [
-<span id="L917" class="LineNr"> 917 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># previous row</span>
-<span id="L918" class="LineNr"> 918 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># end of wrapped line</span>
+<span id="L917" class="LineNr"> 917 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># previous row</span>
+<span id="L918" class="LineNr"> 918 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># end of wrapped line</span>
 <span id="L919" class="LineNr"> 919 </span>  ]
 <span id="L920" class="LineNr"> 920 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L921" class="LineNr"> 921 </span>]
@@ -993,43 +994,43 @@ if ('onhashchange' in window) {
 <span id="L933" class="LineNr"> 933 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L934" class="LineNr"> 934 </span>  $clear-trace
 <span id="L935" class="LineNr"> 935 </span>  assume-console [
-<span id="L936" class="LineNr"> 936 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L937" class="LineNr"> 937 </span>    press up-arrow
+<span id="L936" class="LineNr"> 936 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L937" class="LineNr"> 937 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L938" class="LineNr"> 938 </span>  ]
 <span id="L939" class="LineNr"> 939 </span>  run [
-<span id="L940" class="LineNr"> 940 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L941" class="LineNr"> 941 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L942" class="LineNr"> 942 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L940" class="LineNr"> 940 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L941" class="LineNr"> 941 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
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 <span id="L943" class="LineNr"> 943 </span>  ]
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+<span id="L1018" class="LineNr">1018 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
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-<span id="L1037" class="LineNr">1037 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L1034" class="LineNr">1034 </span>  <span class="Conceal">¦</span> <span class="Comment"># if cursor already at top, scroll up</span>
+<span id="L1035" class="LineNr">1035 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> already-at-top?
+<span id="L1036" class="LineNr">1036 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;scroll-up&gt;</span>
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+<span id="L1056" class="LineNr">1056 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
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 <span id="L1058" class="LineNr">1058 </span>  memory-should-contain [
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 <span id="L1063" class="LineNr">1063 </span>  assume-console [
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+<span id="L1064" class="LineNr">1064 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
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+<span id="L1067" class="LineNr">1067 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1068" class="LineNr">1068 </span>  ]
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+<span id="L1072" class="LineNr">1072 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
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+<span id="L1074" class="LineNr">1074 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
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@@ -1144,31 +1145,31 @@ if ('onhashchange' in window) {
 <span id="L1084" class="LineNr">1084 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
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-<span id="L1088" class="LineNr">1088 </span>    press up-arrow
+<span id="L1087" class="LineNr">1087 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
+<span id="L1088" class="LineNr">1088 </span>  <span class="Conceal">¦</span> press up-arrow
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+<span id="L1091" class="LineNr">1091 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
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 <span id="L1094" class="LineNr">1094 </span>  ]
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 <span id="L1100" class="LineNr">1100 </span>  assume-console [
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+<span id="L1101" class="LineNr">1101 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
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+<span id="L1104" class="LineNr">1104 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1105" class="LineNr">1105 </span>  ]
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-<span id="L1111" class="LineNr">1111 </span>   <span class="Constant"> .          .</span>
+<span id="L1107" class="LineNr">1107 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1108" class="LineNr">1108 </span>  <span class="Conceal">¦</span><span class="Constant"> .0         .</span>
+<span id="L1109" class="LineNr">1109 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
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+<span id="L1111" class="LineNr">1111 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
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@@ -1184,31 +1185,31 @@ if ('onhashchange' in window) {
 <span id="L1124" class="LineNr">1124 </span>  $clear-trace
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-<span id="L1128" class="LineNr">1128 </span>    press up-arrow
+<span id="L1127" class="LineNr">1127 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L1128" class="LineNr">1128 </span>  <span class="Conceal">¦</span> press up-arrow
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+<span id="L1131" class="LineNr">1131 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1132" class="LineNr">1132 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1133" class="LineNr">1133 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
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-<span id="L1137" class="LineNr">1137 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
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+<span id="L1144" class="LineNr">1144 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1145" class="LineNr">1145 </span>  ]
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-<span id="L1151" class="LineNr">1151 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1147" class="LineNr">1147 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1148" class="LineNr">1148 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1149" class="LineNr">1149 </span>  <span class="Conceal">¦</span><span class="Constant"> .0def      .</span>
+<span id="L1150" class="LineNr">1150 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L1151" class="LineNr">1151 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
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+<span id="L1167" class="LineNr">1167 </span>  <span class="Conceal">¦</span> press down-arrow
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+<span id="L1170" class="LineNr">1170 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
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-<span id="L1177" class="LineNr">1177 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
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+<span id="L1188" class="LineNr">1188 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1189" class="LineNr">1189 </span>  <span class="Conceal">¦</span><span class="Constant"> .0def      .</span>
+<span id="L1190" class="LineNr">1190 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1191" class="LineNr">1191 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
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 <span id="L1193" class="LineNr">1193 </span>]
 <span id="L1194" class="LineNr">1194 </span>
 <span id="L1195" class="LineNr">1195 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L1196" class="LineNr">1196 </span>  <span class="Delimiter">{</span>
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-<span id="L1198" class="LineNr">1198 </span>    <span class="muControl">break-unless</span> move-to-next-line?
-<span id="L1199" class="LineNr">1199 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L1200" class="LineNr">1200 </span>    go-render? <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1207'>move-to-next-line</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L1201" class="LineNr">1201 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">4/down-arrow</span>
-<span id="L1202" class="LineNr">1202 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L1203" class="LineNr">1203 </span>    <span class="muControl">return</span>
+<span id="L1197" class="LineNr">1197 </span>  <span class="Conceal">¦</span> move-to-next-line?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65516/down-arrow</span>
+<span id="L1198" class="LineNr">1198 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-next-line?
+<span id="L1199" class="LineNr">1199 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L1200" class="LineNr">1200 </span>  <span class="Conceal">¦</span> go-render? <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1207'>move-to-next-line</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L1201" class="LineNr">1201 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">4/down-arrow</span>
+<span id="L1202" class="LineNr">1202 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L1203" class="LineNr">1203 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L1204" class="LineNr">1204 </span>  <span class="Delimiter">}</span>
 <span id="L1205" class="LineNr">1205 </span>]
 <span id="L1206" class="LineNr">1206 </span>
@@ -1275,43 +1276,43 @@ if ('onhashchange' in window) {
 <span id="L1215" class="LineNr">1215 </span>  last-line:num <span class="Special">&lt;-</span> subtract <a href='../081print.mu.html#L594'>screen-height</a>,<span class="Constant"> 1</span>
 <span id="L1216" class="LineNr">1216 </span>  already-at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-row, last-line
 <span id="L1217" class="LineNr">1217 </span>  <span class="Delimiter">{</span>
-<span id="L1218" class="LineNr">1218 </span>    <span class="Comment"># if cursor not at bottom, move it</span>
-<span id="L1219" class="LineNr">1219 </span>    <span class="muControl">break-if</span> already-at-bottom?
-<span id="L1220" class="LineNr">1220 </span>    <span class="Comment"># scan to start of next line, then to right column or until end of line</span>
-<span id="L1221" class="LineNr">1221 </span>    max:num <span class="Special">&lt;-</span> subtract right, left
-<span id="L1222" class="LineNr">1222 </span>    next-line:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1988'>before-start-of-next-line</a> before-cursor, max
-<span id="L1223" class="LineNr">1223 </span>    <span class="Delimiter">{</span>
-<span id="L1224" class="LineNr">1224 </span>      <span class="Comment"># already at end of buffer? try to scroll up (so we can see more</span>
-<span id="L1225" class="LineNr">1225 </span>      <span class="Comment"># warnings or sandboxes below)</span>
-<span id="L1226" class="LineNr">1226 </span>      no-motion?:bool <span class="Special">&lt;-</span> equal next-line, before-cursor
-<span id="L1227" class="LineNr">1227 </span>      <span class="muControl">break-unless</span> no-motion?
-<span id="L1228" class="LineNr">1228 </span>      scroll?:bool <span class="Special">&lt;-</span> greater-than cursor-row,<span class="Constant"> 1</span>
-<span id="L1229" class="LineNr">1229 </span>      <span class="muControl">break-if</span> scroll?, <span class="Constant">+try-to-scroll</span>
-<span id="L1230" class="LineNr">1230 </span>      <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
-<span id="L1231" class="LineNr">1231 </span>    <span class="Delimiter">}</span>
-<span id="L1232" class="LineNr">1232 </span>    cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
-<span id="L1233" class="LineNr">1233 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L1234" class="LineNr">1234 </span>    before-cursor <span class="Special">&lt;-</span> copy next-line
-<span id="L1235" class="LineNr">1235 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L1236" class="LineNr">1236 </span>    target-column:num <span class="Special">&lt;-</span> copy cursor-column
-<span id="L1237" class="LineNr">1237 </span>    cursor-column <span class="Special">&lt;-</span> copy left
-<span id="L1238" class="LineNr">1238 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L1239" class="LineNr">1239 </span>    <span class="Delimiter">{</span>
-<span id="L1240" class="LineNr">1240 </span>      done?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, target-column
-<span id="L1241" class="LineNr">1241 </span>      <span class="muControl">break-if</span> done?
-<span id="L1242" class="LineNr">1242 </span>      curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L1243" class="LineNr">1243 </span>      <span class="muControl">break-unless</span> curr
-<span id="L1244" class="LineNr">1244 </span>      currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L1245" class="LineNr">1245 </span>      at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
-<span id="L1246" class="LineNr">1246 </span>      <span class="muControl">break-if</span> at-newline?
-<span id="L1247" class="LineNr">1247 </span>      <span class="Comment">#</span>
-<span id="L1248" class="LineNr">1248 </span>      before-cursor <span class="Special">&lt;-</span> copy curr
-<span id="L1249" class="LineNr">1249 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L1250" class="LineNr">1250 </span>      cursor-column <span class="Special">&lt;-</span> add cursor-column,<span class="Constant"> 1</span>
-<span id="L1251" class="LineNr">1251 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
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-<span id="L1254" class="LineNr">1254 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L1218" class="LineNr">1218 </span>  <span class="Conceal">¦</span> <span class="Comment"># if cursor not at bottom, move it</span>
+<span id="L1219" class="LineNr">1219 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> already-at-bottom?
+<span id="L1220" class="LineNr">1220 </span>  <span class="Conceal">¦</span> <span class="Comment"># scan to start of next line, then to right column or until end of line</span>
+<span id="L1221" class="LineNr">1221 </span>  <span class="Conceal">¦</span> max:num <span class="Special">&lt;-</span> subtract right, left
+<span id="L1222" class="LineNr">1222 </span>  <span class="Conceal">¦</span> next-line:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1988'>before-start-of-next-line</a> before-cursor, max
+<span id="L1223" class="LineNr">1223 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L1224" class="LineNr">1224 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># already at end of buffer? try to scroll up (so we can see more</span>
+<span id="L1225" class="LineNr">1225 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># warnings or sandboxes below)</span>
+<span id="L1226" class="LineNr">1226 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> no-motion?:bool <span class="Special">&lt;-</span> equal next-line, before-cursor
+<span id="L1227" class="LineNr">1227 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> no-motion?
+<span id="L1228" class="LineNr">1228 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> scroll?:bool <span class="Special">&lt;-</span> greater-than cursor-row,<span class="Constant"> 1</span>
+<span id="L1229" class="LineNr">1229 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> scroll?, <span class="Constant">+try-to-scroll</span>
+<span id="L1230" class="LineNr">1230 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L1231" class="LineNr">1231 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L1232" class="LineNr">1232 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> add cursor-row,<span class="Constant"> 1</span>
+<span id="L1233" class="LineNr">1233 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L1234" class="LineNr">1234 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy next-line
+<span id="L1235" class="LineNr">1235 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L1236" class="LineNr">1236 </span>  <span class="Conceal">¦</span> target-column:num <span class="Special">&lt;-</span> copy cursor-column
+<span id="L1237" class="LineNr">1237 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy left
+<span id="L1238" class="LineNr">1238 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L1239" class="LineNr">1239 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L1240" class="LineNr">1240 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal cursor-column, target-column
+<span id="L1241" class="LineNr">1241 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L1242" class="LineNr">1242 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L1243" class="LineNr">1243 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L1244" class="LineNr">1244 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> currc:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L1245" class="LineNr">1245 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal currc, <span class="Constant">10/newline</span>
+<span id="L1246" class="LineNr">1246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L1247" class="LineNr">1247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">#</span>
+<span id="L1248" class="LineNr">1248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy curr
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+<span id="L1250" class="LineNr">1250 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> add cursor-column,<span class="Constant"> 1</span>
+<span id="L1251" class="LineNr">1251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L1252" class="LineNr">1252 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L1253" class="LineNr">1253 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L1254" class="LineNr">1254 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L1255" class="LineNr">1255 </span>  <span class="Delimiter">}</span>
 <span id="L1256" class="LineNr">1256 </span><span class="Constant">  +try-to-scroll</span>
 <span id="L1257" class="LineNr">1257 </span><span class="Constant">  &lt;scroll-down&gt;</span>
@@ -1327,31 +1328,31 @@ if ('onhashchange' in window) {
 <span id="L1267" class="LineNr">1267 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1268" class="LineNr">1268 </span>  $clear-trace
 <span id="L1269" class="LineNr">1269 </span>  assume-console [
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-<span id="L1271" class="LineNr">1271 </span>    press down-arrow
+<span id="L1270" class="LineNr">1270 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L1271" class="LineNr">1271 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L1272" class="LineNr">1272 </span>  ]
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-<span id="L1276" class="LineNr">1276 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1274" class="LineNr">1274 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1275" class="LineNr">1275 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1276" class="LineNr">1276 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
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 <span id="L1278" class="LineNr">1278 </span>  memory-should-contain [
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-<span id="L1280" class="LineNr">1280 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1279" class="LineNr">1279 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1280" class="LineNr">1280 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
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 <span id="L1282" class="LineNr">1282 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1283" class="LineNr">1283 </span>  assume-console [
-<span id="L1284" class="LineNr">1284 </span>    type <span class="Constant">[0]</span>
+<span id="L1284" class="LineNr">1284 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L1285" class="LineNr">1285 </span>  ]
 <span id="L1286" class="LineNr">1286 </span>  run [
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+<span id="L1287" class="LineNr">1287 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
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-<span id="L1290" class="LineNr">1290 </span>   <span class="Constant"> .          .</span>
-<span id="L1291" class="LineNr">1291 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1292" class="LineNr">1292 </span>   <span class="Constant"> .de0       .</span>
-<span id="L1293" class="LineNr">1293 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1294" class="LineNr">1294 </span>   <span class="Constant"> .          .</span>
+<span id="L1290" class="LineNr">1290 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1291" class="LineNr">1291 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1292" class="LineNr">1292 </span>  <span class="Conceal">¦</span><span class="Constant"> .de0       .</span>
+<span id="L1293" class="LineNr">1293 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1294" class="LineNr">1294 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
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 <span id="L1296" class="LineNr">1296 </span>]
 <span id="L1297" class="LineNr">1297 </span>
@@ -1367,43 +1368,43 @@ if ('onhashchange' in window) {
 <span id="L1307" class="LineNr">1307 </span>  $clear-trace
 <span id="L1308" class="LineNr">1308 </span>  <span class="Comment"># start on second line, press ctrl-a</span>
 <span id="L1309" class="LineNr">1309 </span>  assume-console [
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-<span id="L1311" class="LineNr">1311 </span>    press ctrl-a
+<span id="L1310" class="LineNr">1310 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
+<span id="L1311" class="LineNr">1311 </span>  <span class="Conceal">¦</span> press ctrl-a
 <span id="L1312" class="LineNr">1312 </span>  ]
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-<span id="L1314" class="LineNr">1314 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1315" class="LineNr">1315 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1316" class="LineNr">1316 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1314" class="LineNr">1314 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1315" class="LineNr">1315 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1316" class="LineNr">1316 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1317" class="LineNr">1317 </span>  ]
 <span id="L1318" class="LineNr">1318 </span>  <span class="Comment"># cursor moves to start of line</span>
 <span id="L1319" class="LineNr">1319 </span>  memory-should-contain [
-<span id="L1320" class="LineNr">1320 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1321" class="LineNr">1321 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1320" class="LineNr">1320 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1321" class="LineNr">1321 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L1322" class="LineNr">1322 </span>  ]
 <span id="L1323" class="LineNr">1323 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1324" class="LineNr">1324 </span>]
 <span id="L1325" class="LineNr">1325 </span>
 <span id="L1326" class="LineNr">1326 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L1327" class="LineNr">1327 </span>  <span class="Delimiter">{</span>
-<span id="L1328" class="LineNr">1328 </span>    move-to-start-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">1/ctrl-a</span>
-<span id="L1329" class="LineNr">1329 </span>    <span class="muControl">break-unless</span> move-to-start-of-line?
-<span id="L1330" class="LineNr">1330 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L1331" class="LineNr">1331 </span>    <a href='003-shortcuts.mu.html#L1350'>move-to-start-of-line</a> editor
-<span id="L1332" class="LineNr">1332 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L1333" class="LineNr">1333 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L1334" class="LineNr">1334 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L1328" class="LineNr">1328 </span>  <span class="Conceal">¦</span> move-to-start-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">1/ctrl-a</span>
+<span id="L1329" class="LineNr">1329 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-start-of-line?
+<span id="L1330" class="LineNr">1330 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L1331" class="LineNr">1331 </span>  <span class="Conceal">¦</span> <a href='003-shortcuts.mu.html#L1350'>move-to-start-of-line</a> editor
+<span id="L1332" class="LineNr">1332 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L1333" class="LineNr">1333 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L1334" class="LineNr">1334 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L1335" class="LineNr">1335 </span>  <span class="Delimiter">}</span>
 <span id="L1336" class="LineNr">1336 </span>]
 <span id="L1337" class="LineNr">1337 </span>
 <span id="L1338" class="LineNr">1338 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L1339" class="LineNr">1339 </span>  <span class="Delimiter">{</span>
-<span id="L1340" class="LineNr">1340 </span>    move-to-start-of-line?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65521/home</span>
-<span id="L1341" class="LineNr">1341 </span>    <span class="muControl">break-unless</span> move-to-start-of-line?
-<span id="L1342" class="LineNr">1342 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L1343" class="LineNr">1343 </span>    <a href='003-shortcuts.mu.html#L1350'>move-to-start-of-line</a> editor
-<span id="L1344" class="LineNr">1344 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L1345" class="LineNr">1345 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L1346" class="LineNr">1346 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L1340" class="LineNr">1340 </span>  <span class="Conceal">¦</span> move-to-start-of-line?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65521/home</span>
+<span id="L1341" class="LineNr">1341 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-start-of-line?
+<span id="L1342" class="LineNr">1342 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L1343" class="LineNr">1343 </span>  <span class="Conceal">¦</span> <a href='003-shortcuts.mu.html#L1350'>move-to-start-of-line</a> editor
+<span id="L1344" class="LineNr">1344 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L1345" class="LineNr">1345 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L1346" class="LineNr">1346 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L1347" class="LineNr">1347 </span>  <span class="Delimiter">}</span>
 <span id="L1348" class="LineNr">1348 </span>]
 <span id="L1349" class="LineNr">1349 </span>
@@ -1419,15 +1420,15 @@ if ('onhashchange' in window) {
 <span id="L1359" class="LineNr">1359 </span>  init:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
 <span id="L1360" class="LineNr">1360 </span>  <span class="Comment"># while not at start of line, move</span>
 <span id="L1361" class="LineNr">1361 </span>  <span class="Delimiter">{</span>
-<span id="L1362" class="LineNr">1362 </span>    at-start-of-text?:bool <span class="Special">&lt;-</span> equal before-cursor, init
-<span id="L1363" class="LineNr">1363 </span>    <span class="muControl">break-if</span> at-start-of-text?
-<span id="L1364" class="LineNr">1364 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a>:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
-<span id="L1365" class="LineNr">1365 </span>    at-start-of-line?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L36'>prev</a>, <span class="Constant">10/newline</span>
-<span id="L1366" class="LineNr">1366 </span>    <span class="muControl">break-if</span> at-start-of-line?
-<span id="L1367" class="LineNr">1367 </span>    before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
-<span id="L1368" class="LineNr">1368 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L1369" class="LineNr">1369 </span>    assert before-cursor, <span class="Constant">[move-to-start-of-line tried to move before start of text]</span>
-<span id="L1370" class="LineNr">1370 </span>    <span class="muControl">loop</span>
+<span id="L1362" class="LineNr">1362 </span>  <span class="Conceal">¦</span> at-start-of-text?:bool <span class="Special">&lt;-</span> equal before-cursor, init
+<span id="L1363" class="LineNr">1363 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-start-of-text?
+<span id="L1364" class="LineNr">1364 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a>:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
+<span id="L1365" class="LineNr">1365 </span>  <span class="Conceal">¦</span> at-start-of-line?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L36'>prev</a>, <span class="Constant">10/newline</span>
+<span id="L1366" class="LineNr">1366 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-start-of-line?
+<span id="L1367" class="LineNr">1367 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
+<span id="L1368" class="LineNr">1368 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L1369" class="LineNr">1369 </span>  <span class="Conceal">¦</span> assert before-cursor, <span class="Constant">[move-to-start-of-line tried to move before start of text]</span>
+<span id="L1370" class="LineNr">1370 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1371" class="LineNr">1371 </span>  <span class="Delimiter">}</span>
 <span id="L1372" class="LineNr">1372 </span>]
 <span id="L1373" class="LineNr">1373 </span>
@@ -1441,18 +1442,18 @@ if ('onhashchange' in window) {
 <span id="L1381" class="LineNr">1381 </span>  $clear-trace
 <span id="L1382" class="LineNr">1382 </span>  <span class="Comment"># start on first line (no newline before), press ctrl-a</span>
 <span id="L1383" class="LineNr">1383 </span>  assume-console [
-<span id="L1384" class="LineNr">1384 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L1385" class="LineNr">1385 </span>    press ctrl-a
+<span id="L1384" class="LineNr">1384 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L1385" class="LineNr">1385 </span>  <span class="Conceal">¦</span> press ctrl-a
 <span id="L1386" class="LineNr">1386 </span>  ]
 <span id="L1387" class="LineNr">1387 </span>  run [
-<span id="L1388" class="LineNr">1388 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1389" class="LineNr">1389 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1390" class="LineNr">1390 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1388" class="LineNr">1388 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1389" class="LineNr">1389 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1390" class="LineNr">1390 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1391" class="LineNr">1391 </span>  ]
 <span id="L1392" class="LineNr">1392 </span>  <span class="Comment"># cursor moves to start of line</span>
 <span id="L1393" class="LineNr">1393 </span>  memory-should-contain [
-<span id="L1394" class="LineNr">1394 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1395" class="LineNr">1395 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1394" class="LineNr">1394 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1395" class="LineNr">1395 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L1396" class="LineNr">1396 </span>  ]
 <span id="L1397" class="LineNr">1397 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1398" class="LineNr">1398 </span>]
@@ -1466,18 +1467,18 @@ if ('onhashchange' in window) {
 <span id="L1406" class="LineNr">1406 </span>  $clear-trace
 <span id="L1407" class="LineNr">1407 </span>  <span class="Comment"># start on second line, press 'home'</span>
 <span id="L1408" class="LineNr">1408 </span>  assume-console [
-<span id="L1409" class="LineNr">1409 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
-<span id="L1410" class="LineNr">1410 </span>    press home
+<span id="L1409" class="LineNr">1409 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
+<span id="L1410" class="LineNr">1410 </span>  <span class="Conceal">¦</span> press home
 <span id="L1411" class="LineNr">1411 </span>  ]
 <span id="L1412" class="LineNr">1412 </span>  run [
-<span id="L1413" class="LineNr">1413 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1414" class="LineNr">1414 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1415" class="LineNr">1415 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1413" class="LineNr">1413 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1414" class="LineNr">1414 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1415" class="LineNr">1415 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1416" class="LineNr">1416 </span>  ]
 <span id="L1417" class="LineNr">1417 </span>  <span class="Comment"># cursor moves to start of line</span>
 <span id="L1418" class="LineNr">1418 </span>  memory-should-contain [
-<span id="L1419" class="LineNr">1419 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1420" class="LineNr">1420 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1419" class="LineNr">1419 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1420" class="LineNr">1420 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L1421" class="LineNr">1421 </span>  ]
 <span id="L1422" class="LineNr">1422 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1423" class="LineNr">1423 </span>]
@@ -1492,18 +1493,18 @@ if ('onhashchange' in window) {
 <span id="L1432" class="LineNr">1432 </span>  $clear-trace
 <span id="L1433" class="LineNr">1433 </span>  <span class="Comment"># start on first line (no newline before), press 'home'</span>
 <span id="L1434" class="LineNr">1434 </span>  assume-console [
-<span id="L1435" class="LineNr">1435 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L1436" class="LineNr">1436 </span>    press home
+<span id="L1435" class="LineNr">1435 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L1436" class="LineNr">1436 </span>  <span class="Conceal">¦</span> press home
 <span id="L1437" class="LineNr">1437 </span>  ]
 <span id="L1438" class="LineNr">1438 </span>  run [
-<span id="L1439" class="LineNr">1439 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1440" class="LineNr">1440 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1441" class="LineNr">1441 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1439" class="LineNr">1439 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1440" class="LineNr">1440 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1441" class="LineNr">1441 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1442" class="LineNr">1442 </span>  ]
 <span id="L1443" class="LineNr">1443 </span>  <span class="Comment"># cursor moves to start of line</span>
 <span id="L1444" class="LineNr">1444 </span>  memory-should-contain [
-<span id="L1445" class="LineNr">1445 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1446" class="LineNr">1446 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1445" class="LineNr">1445 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1446" class="LineNr">1446 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L1447" class="LineNr">1447 </span>  ]
 <span id="L1448" class="LineNr">1448 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1449" class="LineNr">1449 </span>]
@@ -1520,64 +1521,64 @@ if ('onhashchange' in window) {
 <span id="L1460" class="LineNr">1460 </span>  $clear-trace
 <span id="L1461" class="LineNr">1461 </span>  <span class="Comment"># start on first line, press ctrl-e</span>
 <span id="L1462" class="LineNr">1462 </span>  assume-console [
-<span id="L1463" class="LineNr">1463 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L1464" class="LineNr">1464 </span>    press ctrl-e
+<span id="L1463" class="LineNr">1463 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L1464" class="LineNr">1464 </span>  <span class="Conceal">¦</span> press ctrl-e
 <span id="L1465" class="LineNr">1465 </span>  ]
 <span id="L1466" class="LineNr">1466 </span>  run [
-<span id="L1467" class="LineNr">1467 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1468" class="LineNr">1468 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1469" class="LineNr">1469 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1467" class="LineNr">1467 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1468" class="LineNr">1468 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1469" class="LineNr">1469 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1470" class="LineNr">1470 </span>  ]
 <span id="L1471" class="LineNr">1471 </span>  <span class="Comment"># cursor moves to end of line</span>
 <span id="L1472" class="LineNr">1472 </span>  memory-should-contain [
-<span id="L1473" class="LineNr">1473 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1474" class="LineNr">1474 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1473" class="LineNr">1473 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1474" class="LineNr">1474 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1475" class="LineNr">1475 </span>  ]
 <span id="L1476" class="LineNr">1476 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1477" class="LineNr">1477 </span>  <span class="Comment"># editor inserts future characters at cursor</span>
 <span id="L1478" class="LineNr">1478 </span>  assume-console [
-<span id="L1479" class="LineNr">1479 </span>    type <span class="Constant">[z]</span>
+<span id="L1479" class="LineNr">1479 </span>  <span class="Conceal">¦</span> type <span class="Constant">[z]</span>
 <span id="L1480" class="LineNr">1480 </span>  ]
 <span id="L1481" class="LineNr">1481 </span>  run [
-<span id="L1482" class="LineNr">1482 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1483" class="LineNr">1483 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1484" class="LineNr">1484 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1482" class="LineNr">1482 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1483" class="LineNr">1483 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1484" class="LineNr">1484 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1485" class="LineNr">1485 </span>  ]
 <span id="L1486" class="LineNr">1486 </span>  memory-should-contain [
-<span id="L1487" class="LineNr">1487 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1488" class="LineNr">1488 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
+<span id="L1487" class="LineNr">1487 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1488" class="LineNr">1488 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>
 <span id="L1489" class="LineNr">1489 </span>  ]
 <span id="L1490" class="LineNr">1490 </span>  screen-should-contain [
-<span id="L1491" class="LineNr">1491 </span>   <span class="Constant"> .          .</span>
-<span id="L1492" class="LineNr">1492 </span>   <span class="Constant"> .123z      .</span>
-<span id="L1493" class="LineNr">1493 </span>   <span class="Constant"> .456       .</span>
-<span id="L1494" class="LineNr">1494 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1495" class="LineNr">1495 </span>   <span class="Constant"> .          .</span>
+<span id="L1491" class="LineNr">1491 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1492" class="LineNr">1492 </span>  <span class="Conceal">¦</span><span class="Constant"> .123z      .</span>
+<span id="L1493" class="LineNr">1493 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1494" class="LineNr">1494 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1495" class="LineNr">1495 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1496" class="LineNr">1496 </span>  ]
 <span id="L1497" class="LineNr">1497 </span>  check-trace-count-for-label<span class="Constant"> 1</span>, <span class="Constant">[print-character]</span>
 <span id="L1498" class="LineNr">1498 </span>]
 <span id="L1499" class="LineNr">1499 </span>
 <span id="L1500" class="LineNr">1500 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L1501" class="LineNr">1501 </span>  <span class="Delimiter">{</span>
-<span id="L1502" class="LineNr">1502 </span>    move-to-end-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">5/ctrl-e</span>
-<span id="L1503" class="LineNr">1503 </span>    <span class="muControl">break-unless</span> move-to-end-of-line?
-<span id="L1504" class="LineNr">1504 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L1505" class="LineNr">1505 </span>    <a href='003-shortcuts.mu.html#L1524'>move-to-end-of-line</a> editor
-<span id="L1506" class="LineNr">1506 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L1507" class="LineNr">1507 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L1508" class="LineNr">1508 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L1502" class="LineNr">1502 </span>  <span class="Conceal">¦</span> move-to-end-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">5/ctrl-e</span>
+<span id="L1503" class="LineNr">1503 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-end-of-line?
+<span id="L1504" class="LineNr">1504 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L1505" class="LineNr">1505 </span>  <span class="Conceal">¦</span> <a href='003-shortcuts.mu.html#L1524'>move-to-end-of-line</a> editor
+<span id="L1506" class="LineNr">1506 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L1507" class="LineNr">1507 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L1508" class="LineNr">1508 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L1509" class="LineNr">1509 </span>  <span class="Delimiter">}</span>
 <span id="L1510" class="LineNr">1510 </span>]
 <span id="L1511" class="LineNr">1511 </span>
 <span id="L1512" class="LineNr">1512 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L1513" class="LineNr">1513 </span>  <span class="Delimiter">{</span>
-<span id="L1514" class="LineNr">1514 </span>    move-to-end-of-line?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65520/end</span>
-<span id="L1515" class="LineNr">1515 </span>    <span class="muControl">break-unless</span> move-to-end-of-line?
-<span id="L1516" class="LineNr">1516 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L1517" class="LineNr">1517 </span>    <a href='003-shortcuts.mu.html#L1524'>move-to-end-of-line</a> editor
-<span id="L1518" class="LineNr">1518 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L1519" class="LineNr">1519 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L1520" class="LineNr">1520 </span>    <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
+<span id="L1514" class="LineNr">1514 </span>  <span class="Conceal">¦</span> move-to-end-of-line?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65520/end</span>
+<span id="L1515" class="LineNr">1515 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> move-to-end-of-line?
+<span id="L1516" class="LineNr">1516 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L1517" class="LineNr">1517 </span>  <span class="Conceal">¦</span> <a href='003-shortcuts.mu.html#L1524'>move-to-end-of-line</a> editor
+<span id="L1518" class="LineNr">1518 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L1519" class="LineNr">1519 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L1520" class="LineNr">1520 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/don't-render</span>
 <span id="L1521" class="LineNr">1521 </span>  <span class="Delimiter">}</span>
 <span id="L1522" class="LineNr">1522 </span>]
 <span id="L1523" class="LineNr">1523 </span>
@@ -1588,16 +1589,16 @@ if ('onhashchange' in window) {
 <span id="L1528" class="LineNr">1528 </span>  cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
 <span id="L1529" class="LineNr">1529 </span>  <span class="Comment"># while not at start of line, move</span>
 <span id="L1530" class="LineNr">1530 </span>  <span class="Delimiter">{</span>
-<span id="L1531" class="LineNr">1531 </span>    <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L1532" class="LineNr">1532 </span>    <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>  <span class="Comment"># end of text</span>
-<span id="L1533" class="LineNr">1533 </span>    nextc:char <span class="Special">&lt;-</span> get *next, <span class="Constant">value:offset</span>
-<span id="L1534" class="LineNr">1534 </span>    at-end-of-line?:bool <span class="Special">&lt;-</span> equal nextc, <span class="Constant">10/newline</span>
-<span id="L1535" class="LineNr">1535 </span>    <span class="muControl">break-if</span> at-end-of-line?
-<span id="L1536" class="LineNr">1536 </span>    before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L29'>next</a>
-<span id="L1537" class="LineNr">1537 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L1538" class="LineNr">1538 </span>    cursor-column <span class="Special">&lt;-</span> add cursor-column,<span class="Constant"> 1</span>
-<span id="L1539" class="LineNr">1539 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L1540" class="LineNr">1540 </span>    <span class="muControl">loop</span>
+<span id="L1531" class="LineNr">1531 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L1532" class="LineNr">1532 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>  <span class="Comment"># end of text</span>
+<span id="L1533" class="LineNr">1533 </span>  <span class="Conceal">¦</span> nextc:char <span class="Special">&lt;-</span> get *next, <span class="Constant">value:offset</span>
+<span id="L1534" class="LineNr">1534 </span>  <span class="Conceal">¦</span> at-end-of-line?:bool <span class="Special">&lt;-</span> equal nextc, <span class="Constant">10/newline</span>
+<span id="L1535" class="LineNr">1535 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-end-of-line?
+<span id="L1536" class="LineNr">1536 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L29'>next</a>
+<span id="L1537" class="LineNr">1537 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L1538" class="LineNr">1538 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> add cursor-column,<span class="Constant"> 1</span>
+<span id="L1539" class="LineNr">1539 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L1540" class="LineNr">1540 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1541" class="LineNr">1541 </span>  <span class="Delimiter">}</span>
 <span id="L1542" class="LineNr">1542 </span>]
 <span id="L1543" class="LineNr">1543 </span>
@@ -1611,18 +1612,18 @@ if ('onhashchange' in window) {
 <span id="L1551" class="LineNr">1551 </span>  $clear-trace
 <span id="L1552" class="LineNr">1552 </span>  <span class="Comment"># start on second line (no newline after), press ctrl-e</span>
 <span id="L1553" class="LineNr">1553 </span>  assume-console [
-<span id="L1554" class="LineNr">1554 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1555" class="LineNr">1555 </span>    press ctrl-e
+<span id="L1554" class="LineNr">1554 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1555" class="LineNr">1555 </span>  <span class="Conceal">¦</span> press ctrl-e
 <span id="L1556" class="LineNr">1556 </span>  ]
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-<span id="L1559" class="LineNr">1559 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1560" class="LineNr">1560 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1558" class="LineNr">1558 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1559" class="LineNr">1559 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1560" class="LineNr">1560 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1561" class="LineNr">1561 </span>  ]
 <span id="L1562" class="LineNr">1562 </span>  <span class="Comment"># cursor moves to end of line</span>
 <span id="L1563" class="LineNr">1563 </span>  memory-should-contain [
-<span id="L1564" class="LineNr">1564 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1565" class="LineNr">1565 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1564" class="LineNr">1564 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1565" class="LineNr">1565 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1566" class="LineNr">1566 </span>  ]
 <span id="L1567" class="LineNr">1567 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1568" class="LineNr">1568 </span>]
@@ -1637,18 +1638,18 @@ if ('onhashchange' in window) {
 <span id="L1577" class="LineNr">1577 </span>  $clear-trace
 <span id="L1578" class="LineNr">1578 </span>  <span class="Comment"># start on first line, press 'end'</span>
 <span id="L1579" class="LineNr">1579 </span>  assume-console [
-<span id="L1580" class="LineNr">1580 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L1581" class="LineNr">1581 </span>    press end
+<span id="L1580" class="LineNr">1580 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L1581" class="LineNr">1581 </span>  <span class="Conceal">¦</span> press end
 <span id="L1582" class="LineNr">1582 </span>  ]
 <span id="L1583" class="LineNr">1583 </span>  run [
-<span id="L1584" class="LineNr">1584 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1585" class="LineNr">1585 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1586" class="LineNr">1586 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1584" class="LineNr">1584 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1585" class="LineNr">1585 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1586" class="LineNr">1586 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1587" class="LineNr">1587 </span>  ]
 <span id="L1588" class="LineNr">1588 </span>  <span class="Comment"># cursor moves to end of line</span>
 <span id="L1589" class="LineNr">1589 </span>  memory-should-contain [
-<span id="L1590" class="LineNr">1590 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1591" class="LineNr">1591 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1590" class="LineNr">1590 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1591" class="LineNr">1591 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1592" class="LineNr">1592 </span>  ]
 <span id="L1593" class="LineNr">1593 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1594" class="LineNr">1594 </span>]
@@ -1663,18 +1664,18 @@ if ('onhashchange' in window) {
 <span id="L1603" class="LineNr">1603 </span>  $clear-trace
 <span id="L1604" class="LineNr">1604 </span>  <span class="Comment"># start on second line (no newline after), press 'end'</span>
 <span id="L1605" class="LineNr">1605 </span>  assume-console [
-<span id="L1606" class="LineNr">1606 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1607" class="LineNr">1607 </span>    press end
+<span id="L1606" class="LineNr">1606 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1607" class="LineNr">1607 </span>  <span class="Conceal">¦</span> press end
 <span id="L1608" class="LineNr">1608 </span>  ]
 <span id="L1609" class="LineNr">1609 </span>  run [
-<span id="L1610" class="LineNr">1610 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1611" class="LineNr">1611 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1612" class="LineNr">1612 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1610" class="LineNr">1610 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1611" class="LineNr">1611 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1612" class="LineNr">1612 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1613" class="LineNr">1613 </span>  ]
 <span id="L1614" class="LineNr">1614 </span>  <span class="Comment"># cursor moves to end of line</span>
 <span id="L1615" class="LineNr">1615 </span>  memory-should-contain [
-<span id="L1616" class="LineNr">1616 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1617" class="LineNr">1617 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1616" class="LineNr">1616 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1617" class="LineNr">1617 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1618" class="LineNr">1618 </span>  ]
 <span id="L1619" class="LineNr">1619 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L1620" class="LineNr">1620 </span>]
@@ -1689,30 +1690,30 @@ if ('onhashchange' in window) {
 <span id="L1629" class="LineNr">1629 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1630" class="LineNr">1630 </span>  <span class="Comment"># start on second line, press ctrl-u</span>
 <span id="L1631" class="LineNr">1631 </span>  assume-console [
-<span id="L1632" class="LineNr">1632 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
-<span id="L1633" class="LineNr">1633 </span>    press ctrl-u
+<span id="L1632" class="LineNr">1632 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L1633" class="LineNr">1633 </span>  <span class="Conceal">¦</span> press ctrl-u
 <span id="L1634" class="LineNr">1634 </span>  ]
 <span id="L1635" class="LineNr">1635 </span>  run [
-<span id="L1636" class="LineNr">1636 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1636" class="LineNr">1636 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1637" class="LineNr">1637 </span>  ]
 <span id="L1638" class="LineNr">1638 </span>  <span class="Comment"># cursor deletes to start of line</span>
 <span id="L1639" class="LineNr">1639 </span>  screen-should-contain [
-<span id="L1640" class="LineNr">1640 </span>   <span class="Constant"> .          .</span>
-<span id="L1641" class="LineNr">1641 </span>   <span class="Constant"> .123       .</span>
-<span id="L1642" class="LineNr">1642 </span>   <span class="Constant"> .6         .</span>
-<span id="L1643" class="LineNr">1643 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1644" class="LineNr">1644 </span>   <span class="Constant"> .          .</span>
+<span id="L1640" class="LineNr">1640 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1641" class="LineNr">1641 </span>  <span class="Conceal">¦</span><span class="Constant"> .123       .</span>
+<span id="L1642" class="LineNr">1642 </span>  <span class="Conceal">¦</span><span class="Constant"> .6         .</span>
+<span id="L1643" class="LineNr">1643 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1644" class="LineNr">1644 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1645" class="LineNr">1645 </span>  ]
 <span id="L1646" class="LineNr">1646 </span>]
 <span id="L1647" class="LineNr">1647 </span>
 <span id="L1648" class="LineNr">1648 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L1649" class="LineNr">1649 </span>  <span class="Delimiter">{</span>
-<span id="L1650" class="LineNr">1650 </span>    delete-to-start-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">21/ctrl-u</span>
-<span id="L1651" class="LineNr">1651 </span>    <span class="muControl">break-unless</span> delete-to-start-of-line?
-<span id="L1652" class="LineNr">1652 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L1652'>&lt;delete-to-start-of-line-begin&gt;</a></span>
-<span id="L1653" class="LineNr">1653 </span>    deleted-cells:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1659'>delete-to-start-of-line</a> editor
-<span id="L1654" class="LineNr">1654 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L1654'>&lt;delete-to-start-of-line-end&gt;</a></span>
-<span id="L1655" class="LineNr">1655 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L1650" class="LineNr">1650 </span>  <span class="Conceal">¦</span> delete-to-start-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">21/ctrl-u</span>
+<span id="L1651" class="LineNr">1651 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> delete-to-start-of-line?
+<span id="L1652" class="LineNr">1652 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L1652'>&lt;delete-to-start-of-line-begin&gt;</a></span>
+<span id="L1653" class="LineNr">1653 </span>  <span class="Conceal">¦</span> deleted-cells:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1659'>delete-to-start-of-line</a> editor
+<span id="L1654" class="LineNr">1654 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L1654'>&lt;delete-to-start-of-line-end&gt;</a></span>
+<span id="L1655" class="LineNr">1655 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L1656" class="LineNr">1656 </span>  <span class="Delimiter">}</span>
 <span id="L1657" class="LineNr">1657 </span>]
 <span id="L1658" class="LineNr">1658 </span>
@@ -1725,14 +1726,14 @@ if ('onhashchange' in window) {
 <span id="L1665" class="LineNr">1665 </span>  start:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy before-cursor
 <span id="L1666" class="LineNr">1666 </span>  end:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
 <span id="L1667" class="LineNr">1667 </span>  <span class="Delimiter">{</span>
-<span id="L1668" class="LineNr">1668 </span>    at-start-of-text?:bool <span class="Special">&lt;-</span> equal start, init
-<span id="L1669" class="LineNr">1669 </span>    <span class="muControl">break-if</span> at-start-of-text?
-<span id="L1670" class="LineNr">1670 </span>    curr:char <span class="Special">&lt;-</span> get *start, <span class="Constant">value:offset</span>
-<span id="L1671" class="LineNr">1671 </span>    at-start-of-line?:bool <span class="Special">&lt;-</span> equal curr, <span class="Constant">10/newline</span>
-<span id="L1672" class="LineNr">1672 </span>    <span class="muControl">break-if</span> at-start-of-line?
-<span id="L1673" class="LineNr">1673 </span>    start <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> start
-<span id="L1674" class="LineNr">1674 </span>    assert start, <span class="Constant">[delete-to-start-of-line tried to move before start of text]</span>
-<span id="L1675" class="LineNr">1675 </span>    <span class="muControl">loop</span>
+<span id="L1668" class="LineNr">1668 </span>  <span class="Conceal">¦</span> at-start-of-text?:bool <span class="Special">&lt;-</span> equal start, init
+<span id="L1669" class="LineNr">1669 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-start-of-text?
+<span id="L1670" class="LineNr">1670 </span>  <span class="Conceal">¦</span> curr:char <span class="Special">&lt;-</span> get *start, <span class="Constant">value:offset</span>
+<span id="L1671" class="LineNr">1671 </span>  <span class="Conceal">¦</span> at-start-of-line?:bool <span class="Special">&lt;-</span> equal curr, <span class="Constant">10/newline</span>
+<span id="L1672" class="LineNr">1672 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-start-of-line?
+<span id="L1673" class="LineNr">1673 </span>  <span class="Conceal">¦</span> start <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> start
+<span id="L1674" class="LineNr">1674 </span>  <span class="Conceal">¦</span> assert start, <span class="Constant">[delete-to-start-of-line tried to move before start of text]</span>
+<span id="L1675" class="LineNr">1675 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1676" class="LineNr">1676 </span>  <span class="Delimiter">}</span>
 <span id="L1677" class="LineNr">1677 </span>  <span class="Comment"># snip it out</span>
 <span id="L1678" class="LineNr">1678 </span>  result:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> start
@@ -1752,19 +1753,19 @@ if ('onhashchange' in window) {
 <span id="L1692" class="LineNr">1692 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1693" class="LineNr">1693 </span>  <span class="Comment"># start on first line (no newline before), press ctrl-u</span>
 <span id="L1694" class="LineNr">1694 </span>  assume-console [
-<span id="L1695" class="LineNr">1695 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L1696" class="LineNr">1696 </span>    press ctrl-u
+<span id="L1695" class="LineNr">1695 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L1696" class="LineNr">1696 </span>  <span class="Conceal">¦</span> press ctrl-u
 <span id="L1697" class="LineNr">1697 </span>  ]
 <span id="L1698" class="LineNr">1698 </span>  run [
-<span id="L1699" class="LineNr">1699 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1699" class="LineNr">1699 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1700" class="LineNr">1700 </span>  ]
 <span id="L1701" class="LineNr">1701 </span>  <span class="Comment"># cursor deletes to start of line</span>
 <span id="L1702" class="LineNr">1702 </span>  screen-should-contain [
-<span id="L1703" class="LineNr">1703 </span>   <span class="Constant"> .          .</span>
-<span id="L1704" class="LineNr">1704 </span>   <span class="Constant"> .3         .</span>
-<span id="L1705" class="LineNr">1705 </span>   <span class="Constant"> .456       .</span>
-<span id="L1706" class="LineNr">1706 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1707" class="LineNr">1707 </span>   <span class="Constant"> .          .</span>
+<span id="L1703" class="LineNr">1703 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1704" class="LineNr">1704 </span>  <span class="Conceal">¦</span><span class="Constant"> .3         .</span>
+<span id="L1705" class="LineNr">1705 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1706" class="LineNr">1706 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1707" class="LineNr">1707 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1708" class="LineNr">1708 </span>  ]
 <span id="L1709" class="LineNr">1709 </span>]
 <span id="L1710" class="LineNr">1710 </span>
@@ -1776,19 +1777,19 @@ if ('onhashchange' in window) {
 <span id="L1716" class="LineNr">1716 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1717" class="LineNr">1717 </span>  <span class="Comment"># start past end of line, press ctrl-u</span>
 <span id="L1718" class="LineNr">1718 </span>  assume-console [
-<span id="L1719" class="LineNr">1719 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L1720" class="LineNr">1720 </span>    press ctrl-u
+<span id="L1719" class="LineNr">1719 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L1720" class="LineNr">1720 </span>  <span class="Conceal">¦</span> press ctrl-u
 <span id="L1721" class="LineNr">1721 </span>  ]
 <span id="L1722" class="LineNr">1722 </span>  run [
-<span id="L1723" class="LineNr">1723 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1723" class="LineNr">1723 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1724" class="LineNr">1724 </span>  ]
 <span id="L1725" class="LineNr">1725 </span>  <span class="Comment"># cursor deletes to start of line</span>
 <span id="L1726" class="LineNr">1726 </span>  screen-should-contain [
-<span id="L1727" class="LineNr">1727 </span>   <span class="Constant"> .          .</span>
-<span id="L1728" class="LineNr">1728 </span>   <span class="Constant"> .          .</span>
-<span id="L1729" class="LineNr">1729 </span>   <span class="Constant"> .456       .</span>
-<span id="L1730" class="LineNr">1730 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1731" class="LineNr">1731 </span>   <span class="Constant"> .          .</span>
+<span id="L1727" class="LineNr">1727 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1728" class="LineNr">1728 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1729" class="LineNr">1729 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1730" class="LineNr">1730 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1731" class="LineNr">1731 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1732" class="LineNr">1732 </span>  ]
 <span id="L1733" class="LineNr">1733 </span>]
 <span id="L1734" class="LineNr">1734 </span>
@@ -1800,19 +1801,19 @@ if ('onhashchange' in window) {
 <span id="L1740" class="LineNr">1740 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1741" class="LineNr">1741 </span>  <span class="Comment"># start past end of final line, press ctrl-u</span>
 <span id="L1742" class="LineNr">1742 </span>  assume-console [
-<span id="L1743" class="LineNr">1743 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
-<span id="L1744" class="LineNr">1744 </span>    press ctrl-u
+<span id="L1743" class="LineNr">1743 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
+<span id="L1744" class="LineNr">1744 </span>  <span class="Conceal">¦</span> press ctrl-u
 <span id="L1745" class="LineNr">1745 </span>  ]
 <span id="L1746" class="LineNr">1746 </span>  run [
-<span id="L1747" class="LineNr">1747 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1747" class="LineNr">1747 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1748" class="LineNr">1748 </span>  ]
 <span id="L1749" class="LineNr">1749 </span>  <span class="Comment"># cursor deletes to start of line</span>
 <span id="L1750" class="LineNr">1750 </span>  screen-should-contain [
-<span id="L1751" class="LineNr">1751 </span>   <span class="Constant"> .          .</span>
-<span id="L1752" class="LineNr">1752 </span>   <span class="Constant"> .123       .</span>
-<span id="L1753" class="LineNr">1753 </span>   <span class="Constant"> .          .</span>
-<span id="L1754" class="LineNr">1754 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1755" class="LineNr">1755 </span>   <span class="Constant"> .          .</span>
+<span id="L1751" class="LineNr">1751 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1752" class="LineNr">1752 </span>  <span class="Conceal">¦</span><span class="Constant"> .123       .</span>
+<span id="L1753" class="LineNr">1753 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1754" class="LineNr">1754 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1755" class="LineNr">1755 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1756" class="LineNr">1756 </span>  ]
 <span id="L1757" class="LineNr">1757 </span>]
 <span id="L1758" class="LineNr">1758 </span>
@@ -1826,30 +1827,30 @@ if ('onhashchange' in window) {
 <span id="L1766" class="LineNr">1766 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1767" class="LineNr">1767 </span>  <span class="Comment"># start on first line, press ctrl-k</span>
 <span id="L1768" class="LineNr">1768 </span>  assume-console [
-<span id="L1769" class="LineNr">1769 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L1770" class="LineNr">1770 </span>    press ctrl-k
+<span id="L1769" class="LineNr">1769 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L1770" class="LineNr">1770 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1771" class="LineNr">1771 </span>  ]
 <span id="L1772" class="LineNr">1772 </span>  run [
-<span id="L1773" class="LineNr">1773 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1773" class="LineNr">1773 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1774" class="LineNr">1774 </span>  ]
 <span id="L1775" class="LineNr">1775 </span>  <span class="Comment"># cursor deletes to end of line</span>
 <span id="L1776" class="LineNr">1776 </span>  screen-should-contain [
-<span id="L1777" class="LineNr">1777 </span>   <span class="Constant"> .          .</span>
-<span id="L1778" class="LineNr">1778 </span>   <span class="Constant"> .1         .</span>
-<span id="L1779" class="LineNr">1779 </span>   <span class="Constant"> .456       .</span>
-<span id="L1780" class="LineNr">1780 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1781" class="LineNr">1781 </span>   <span class="Constant"> .          .</span>
+<span id="L1777" class="LineNr">1777 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1778" class="LineNr">1778 </span>  <span class="Conceal">¦</span><span class="Constant"> .1         .</span>
+<span id="L1779" class="LineNr">1779 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1780" class="LineNr">1780 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1781" class="LineNr">1781 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1782" class="LineNr">1782 </span>  ]
 <span id="L1783" class="LineNr">1783 </span>]
 <span id="L1784" class="LineNr">1784 </span>
 <span id="L1785" class="LineNr">1785 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L1786" class="LineNr">1786 </span>  <span class="Delimiter">{</span>
-<span id="L1787" class="LineNr">1787 </span>    delete-to-end-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">11/ctrl-k</span>
-<span id="L1788" class="LineNr">1788 </span>    <span class="muControl">break-unless</span> delete-to-end-of-line?
-<span id="L1789" class="LineNr">1789 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L1789'>&lt;delete-to-end-of-line-begin&gt;</a></span>
-<span id="L1790" class="LineNr">1790 </span>    deleted-cells:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1796'>delete-to-end-of-line</a> editor
-<span id="L1791" class="LineNr">1791 </span><span class="Constant">    <a href='003-shortcuts.mu.html#L1791'>&lt;delete-to-end-of-line-end&gt;</a></span>
-<span id="L1792" class="LineNr">1792 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L1787" class="LineNr">1787 </span>  <span class="Conceal">¦</span> delete-to-end-of-line?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">11/ctrl-k</span>
+<span id="L1788" class="LineNr">1788 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> delete-to-end-of-line?
+<span id="L1789" class="LineNr">1789 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L1789'>&lt;delete-to-end-of-line-begin&gt;</a></span>
+<span id="L1790" class="LineNr">1790 </span>  <span class="Conceal">¦</span> deleted-cells:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L1796'>delete-to-end-of-line</a> editor
+<span id="L1791" class="LineNr">1791 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='003-shortcuts.mu.html#L1791'>&lt;delete-to-end-of-line-end&gt;</a></span>
+<span id="L1792" class="LineNr">1792 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L1793" class="LineNr">1793 </span>  <span class="Delimiter">}</span>
 <span id="L1794" class="LineNr">1794 </span>]
 <span id="L1795" class="LineNr">1795 </span>
@@ -1860,13 +1861,13 @@ if ('onhashchange' in window) {
 <span id="L1800" class="LineNr">1800 </span>  start:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
 <span id="L1801" class="LineNr">1801 </span>  end:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> start
 <span id="L1802" class="LineNr">1802 </span>  <span class="Delimiter">{</span>
-<span id="L1803" class="LineNr">1803 </span>    at-end-of-text?:bool <span class="Special">&lt;-</span> equal end, <span class="Constant">0/null</span>
-<span id="L1804" class="LineNr">1804 </span>    <span class="muControl">break-if</span> at-end-of-text?
-<span id="L1805" class="LineNr">1805 </span>    curr:char <span class="Special">&lt;-</span> get *end, <span class="Constant">value:offset</span>
-<span id="L1806" class="LineNr">1806 </span>    at-end-of-line?:bool <span class="Special">&lt;-</span> equal curr, <span class="Constant">10/newline</span>
-<span id="L1807" class="LineNr">1807 </span>    <span class="muControl">break-if</span> at-end-of-line?
-<span id="L1808" class="LineNr">1808 </span>    end <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> end
-<span id="L1809" class="LineNr">1809 </span>    <span class="muControl">loop</span>
+<span id="L1803" class="LineNr">1803 </span>  <span class="Conceal">¦</span> at-end-of-text?:bool <span class="Special">&lt;-</span> equal end, <span class="Constant">0/null</span>
+<span id="L1804" class="LineNr">1804 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-end-of-text?
+<span id="L1805" class="LineNr">1805 </span>  <span class="Conceal">¦</span> curr:char <span class="Special">&lt;-</span> get *end, <span class="Constant">value:offset</span>
+<span id="L1806" class="LineNr">1806 </span>  <span class="Conceal">¦</span> at-end-of-line?:bool <span class="Special">&lt;-</span> equal curr, <span class="Constant">10/newline</span>
+<span id="L1807" class="LineNr">1807 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-end-of-line?
+<span id="L1808" class="LineNr">1808 </span>  <span class="Conceal">¦</span> end <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> end
+<span id="L1809" class="LineNr">1809 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L1810" class="LineNr">1810 </span>  <span class="Delimiter">}</span>
 <span id="L1811" class="LineNr">1811 </span>  <span class="Comment"># snip it out</span>
 <span id="L1812" class="LineNr">1812 </span>  result <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> start
@@ -1881,19 +1882,19 @@ if ('onhashchange' in window) {
 <span id="L1821" class="LineNr">1821 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1822" class="LineNr">1822 </span>  <span class="Comment"># start on second line (no newline after), press ctrl-k</span>
 <span id="L1823" class="LineNr">1823 </span>  assume-console [
-<span id="L1824" class="LineNr">1824 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1825" class="LineNr">1825 </span>    press ctrl-k
+<span id="L1824" class="LineNr">1824 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1825" class="LineNr">1825 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1826" class="LineNr">1826 </span>  ]
 <span id="L1827" class="LineNr">1827 </span>  run [
-<span id="L1828" class="LineNr">1828 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1828" class="LineNr">1828 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1829" class="LineNr">1829 </span>  ]
 <span id="L1830" class="LineNr">1830 </span>  <span class="Comment"># cursor deletes to end of line</span>
 <span id="L1831" class="LineNr">1831 </span>  screen-should-contain [
-<span id="L1832" class="LineNr">1832 </span>   <span class="Constant"> .          .</span>
-<span id="L1833" class="LineNr">1833 </span>   <span class="Constant"> .123       .</span>
-<span id="L1834" class="LineNr">1834 </span>   <span class="Constant"> .4         .</span>
-<span id="L1835" class="LineNr">1835 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1836" class="LineNr">1836 </span>   <span class="Constant"> .          .</span>
+<span id="L1832" class="LineNr">1832 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1833" class="LineNr">1833 </span>  <span class="Conceal">¦</span><span class="Constant"> .123       .</span>
+<span id="L1834" class="LineNr">1834 </span>  <span class="Conceal">¦</span><span class="Constant"> .4         .</span>
+<span id="L1835" class="LineNr">1835 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1836" class="LineNr">1836 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1837" class="LineNr">1837 </span>  ]
 <span id="L1838" class="LineNr">1838 </span>]
 <span id="L1839" class="LineNr">1839 </span>
@@ -1905,19 +1906,19 @@ if ('onhashchange' in window) {
 <span id="L1845" class="LineNr">1845 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1846" class="LineNr">1846 </span>  <span class="Comment"># start at end of line</span>
 <span id="L1847" class="LineNr">1847 </span>  assume-console [
-<span id="L1848" class="LineNr">1848 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L1849" class="LineNr">1849 </span>    press ctrl-k
+<span id="L1848" class="LineNr">1848 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L1849" class="LineNr">1849 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1850" class="LineNr">1850 </span>  ]
 <span id="L1851" class="LineNr">1851 </span>  run [
-<span id="L1852" class="LineNr">1852 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1852" class="LineNr">1852 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1853" class="LineNr">1853 </span>  ]
 <span id="L1854" class="LineNr">1854 </span>  <span class="Comment"># cursor deletes just last character</span>
 <span id="L1855" class="LineNr">1855 </span>  screen-should-contain [
-<span id="L1856" class="LineNr">1856 </span>   <span class="Constant"> .          .</span>
-<span id="L1857" class="LineNr">1857 </span>   <span class="Constant"> .12        .</span>
-<span id="L1858" class="LineNr">1858 </span>   <span class="Constant"> .456       .</span>
-<span id="L1859" class="LineNr">1859 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1860" class="LineNr">1860 </span>   <span class="Constant"> .          .</span>
+<span id="L1856" class="LineNr">1856 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1857" class="LineNr">1857 </span>  <span class="Conceal">¦</span><span class="Constant"> .12        .</span>
+<span id="L1858" class="LineNr">1858 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1859" class="LineNr">1859 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1860" class="LineNr">1860 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1861" class="LineNr">1861 </span>  ]
 <span id="L1862" class="LineNr">1862 </span>]
 <span id="L1863" class="LineNr">1863 </span>
@@ -1929,19 +1930,19 @@ if ('onhashchange' in window) {
 <span id="L1869" class="LineNr">1869 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1870" class="LineNr">1870 </span>  <span class="Comment"># start past end of line</span>
 <span id="L1871" class="LineNr">1871 </span>  assume-console [
-<span id="L1872" class="LineNr">1872 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
-<span id="L1873" class="LineNr">1873 </span>    press ctrl-k
+<span id="L1872" class="LineNr">1872 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 3</span>
+<span id="L1873" class="LineNr">1873 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1874" class="LineNr">1874 </span>  ]
 <span id="L1875" class="LineNr">1875 </span>  run [
-<span id="L1876" class="LineNr">1876 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1876" class="LineNr">1876 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1877" class="LineNr">1877 </span>  ]
 <span id="L1878" class="LineNr">1878 </span>  <span class="Comment"># cursor deletes nothing</span>
 <span id="L1879" class="LineNr">1879 </span>  screen-should-contain [
-<span id="L1880" class="LineNr">1880 </span>   <span class="Constant"> .          .</span>
-<span id="L1881" class="LineNr">1881 </span>   <span class="Constant"> .123       .</span>
-<span id="L1882" class="LineNr">1882 </span>   <span class="Constant"> .456       .</span>
-<span id="L1883" class="LineNr">1883 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1884" class="LineNr">1884 </span>   <span class="Constant"> .          .</span>
+<span id="L1880" class="LineNr">1880 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1881" class="LineNr">1881 </span>  <span class="Conceal">¦</span><span class="Constant"> .123       .</span>
+<span id="L1882" class="LineNr">1882 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1883" class="LineNr">1883 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1884" class="LineNr">1884 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1885" class="LineNr">1885 </span>  ]
 <span id="L1886" class="LineNr">1886 </span>]
 <span id="L1887" class="LineNr">1887 </span>
@@ -1953,19 +1954,19 @@ if ('onhashchange' in window) {
 <span id="L1893" class="LineNr">1893 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1894" class="LineNr">1894 </span>  <span class="Comment"># start at end of text</span>
 <span id="L1895" class="LineNr">1895 </span>  assume-console [
-<span id="L1896" class="LineNr">1896 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
-<span id="L1897" class="LineNr">1897 </span>    press ctrl-k
+<span id="L1896" class="LineNr">1896 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 2</span>
+<span id="L1897" class="LineNr">1897 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1898" class="LineNr">1898 </span>  ]
 <span id="L1899" class="LineNr">1899 </span>  run [
-<span id="L1900" class="LineNr">1900 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1900" class="LineNr">1900 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1901" class="LineNr">1901 </span>  ]
 <span id="L1902" class="LineNr">1902 </span>  <span class="Comment"># cursor deletes just the final character</span>
 <span id="L1903" class="LineNr">1903 </span>  screen-should-contain [
-<span id="L1904" class="LineNr">1904 </span>   <span class="Constant"> .          .</span>
-<span id="L1905" class="LineNr">1905 </span>   <span class="Constant"> .123       .</span>
-<span id="L1906" class="LineNr">1906 </span>   <span class="Constant"> .45        .</span>
-<span id="L1907" class="LineNr">1907 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1908" class="LineNr">1908 </span>   <span class="Constant"> .          .</span>
+<span id="L1904" class="LineNr">1904 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1905" class="LineNr">1905 </span>  <span class="Conceal">¦</span><span class="Constant"> .123       .</span>
+<span id="L1906" class="LineNr">1906 </span>  <span class="Conceal">¦</span><span class="Constant"> .45        .</span>
+<span id="L1907" class="LineNr">1907 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1908" class="LineNr">1908 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1909" class="LineNr">1909 </span>  ]
 <span id="L1910" class="LineNr">1910 </span>]
 <span id="L1911" class="LineNr">1911 </span>
@@ -1977,19 +1978,19 @@ if ('onhashchange' in window) {
 <span id="L1917" class="LineNr">1917 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1918" class="LineNr">1918 </span>  <span class="Comment"># start past end of text</span>
 <span id="L1919" class="LineNr">1919 </span>  assume-console [
-<span id="L1920" class="LineNr">1920 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
-<span id="L1921" class="LineNr">1921 </span>    press ctrl-k
+<span id="L1920" class="LineNr">1920 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 3</span>
+<span id="L1921" class="LineNr">1921 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1922" class="LineNr">1922 </span>  ]
 <span id="L1923" class="LineNr">1923 </span>  run [
-<span id="L1924" class="LineNr">1924 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1924" class="LineNr">1924 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1925" class="LineNr">1925 </span>  ]
 <span id="L1926" class="LineNr">1926 </span>  <span class="Comment"># cursor deletes nothing</span>
 <span id="L1927" class="LineNr">1927 </span>  screen-should-contain [
-<span id="L1928" class="LineNr">1928 </span>   <span class="Constant"> .          .</span>
-<span id="L1929" class="LineNr">1929 </span>   <span class="Constant"> .123       .</span>
-<span id="L1930" class="LineNr">1930 </span>   <span class="Constant"> .456       .</span>
-<span id="L1931" class="LineNr">1931 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1932" class="LineNr">1932 </span>   <span class="Constant"> .          .</span>
+<span id="L1928" class="LineNr">1928 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1929" class="LineNr">1929 </span>  <span class="Conceal">¦</span><span class="Constant"> .123       .</span>
+<span id="L1930" class="LineNr">1930 </span>  <span class="Conceal">¦</span><span class="Constant"> .456       .</span>
+<span id="L1931" class="LineNr">1931 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1932" class="LineNr">1932 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1933" class="LineNr">1933 </span>  ]
 <span id="L1934" class="LineNr">1934 </span>]
 <span id="L1935" class="LineNr">1935 </span>
@@ -2007,25 +2008,25 @@ if ('onhashchange' in window) {
 <span id="L1947" class="LineNr">1947 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1948" class="LineNr">1948 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1949" class="LineNr">1949 </span>  screen-should-contain [
-<span id="L1950" class="LineNr">1950 </span>   <span class="Constant"> .          .</span>
-<span id="L1951" class="LineNr">1951 </span>   <span class="Constant"> .a         .</span>
-<span id="L1952" class="LineNr">1952 </span>   <span class="Constant"> .b         .</span>
-<span id="L1953" class="LineNr">1953 </span>   <span class="Constant"> .c         .</span>
+<span id="L1950" class="LineNr">1950 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1951" class="LineNr">1951 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L1952" class="LineNr">1952 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L1953" class="LineNr">1953 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L1954" class="LineNr">1954 </span>  ]
 <span id="L1955" class="LineNr">1955 </span>  <span class="Comment"># position cursor at last line, then try to move further down</span>
 <span id="L1956" class="LineNr">1956 </span>  assume-console [
-<span id="L1957" class="LineNr">1957 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L1958" class="LineNr">1958 </span>    press down-arrow
+<span id="L1957" class="LineNr">1957 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L1958" class="LineNr">1958 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L1959" class="LineNr">1959 </span>  ]
 <span id="L1960" class="LineNr">1960 </span>  run [
-<span id="L1961" class="LineNr">1961 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1961" class="LineNr">1961 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1962" class="LineNr">1962 </span>  ]
 <span id="L1963" class="LineNr">1963 </span>  <span class="Comment"># screen slides by one line</span>
 <span id="L1964" class="LineNr">1964 </span>  screen-should-contain [
-<span id="L1965" class="LineNr">1965 </span>   <span class="Constant"> .          .</span>
-<span id="L1966" class="LineNr">1966 </span>   <span class="Constant"> .b         .</span>
-<span id="L1967" class="LineNr">1967 </span>   <span class="Constant"> .c         .</span>
-<span id="L1968" class="LineNr">1968 </span>   <span class="Constant"> .d         .</span>
+<span id="L1965" class="LineNr">1965 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1966" class="LineNr">1966 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L1967" class="LineNr">1967 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L1968" class="LineNr">1968 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
 <span id="L1969" class="LineNr">1969 </span>  ]
 <span id="L1970" class="LineNr">1970 </span>]
 <span id="L1971" class="LineNr">1971 </span>
@@ -2052,22 +2053,22 @@ if ('onhashchange' in window) {
 <span id="L1992" class="LineNr">1992 </span>  curr:&amp;:duplex-list:char <span class="Special">&lt;-</span> copy original
 <span id="L1993" class="LineNr">1993 </span>  <span class="Comment"># skip the initial newline if it exists</span>
 <span id="L1994" class="LineNr">1994 </span>  <span class="Delimiter">{</span>
-<span id="L1995" class="LineNr">1995 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L1996" class="LineNr">1996 </span>    at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L1997" class="LineNr">1997 </span>    <span class="muControl">break-unless</span> at-newline?
-<span id="L1998" class="LineNr">1998 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L1999" class="LineNr">1999 </span>    count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
+<span id="L1995" class="LineNr">1995 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L1996" class="LineNr">1996 </span>  <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L1997" class="LineNr">1997 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-newline?
+<span id="L1998" class="LineNr">1998 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L1999" class="LineNr">1999 </span>  <span class="Conceal">¦</span> count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
 <span id="L2000" class="LineNr">2000 </span>  <span class="Delimiter">}</span>
 <span id="L2001" class="LineNr">2001 </span>  <span class="Delimiter">{</span>
-<span id="L2002" class="LineNr">2002 </span>    <span class="muControl">return-unless</span> curr, original
-<span id="L2003" class="LineNr">2003 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal count, max
-<span id="L2004" class="LineNr">2004 </span>    <span class="muControl">break-if</span> done?
-<span id="L2005" class="LineNr">2005 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L2006" class="LineNr">2006 </span>    at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L2007" class="LineNr">2007 </span>    <span class="muControl">break-if</span> at-newline?
-<span id="L2008" class="LineNr">2008 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L2009" class="LineNr">2009 </span>    count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
-<span id="L2010" class="LineNr">2010 </span>    <span class="muControl">loop</span>
+<span id="L2002" class="LineNr">2002 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> curr, original
+<span id="L2003" class="LineNr">2003 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal count, max
+<span id="L2004" class="LineNr">2004 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L2005" class="LineNr">2005 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L2006" class="LineNr">2006 </span>  <span class="Conceal">¦</span> at-newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L2007" class="LineNr">2007 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-newline?
+<span id="L2008" class="LineNr">2008 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L2009" class="LineNr">2009 </span>  <span class="Conceal">¦</span> count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
+<span id="L2010" class="LineNr">2010 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L2011" class="LineNr">2011 </span>  <span class="Delimiter">}</span>
 <span id="L2012" class="LineNr">2012 </span>  <span class="muControl">return-unless</span> curr, original
 <span id="L2013" class="LineNr">2013 </span>  <span class="muControl">return</span> curr
@@ -2086,25 +2087,25 @@ if ('onhashchange' in window) {
 <span id="L2026" class="LineNr">2026 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2027" class="LineNr">2027 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2028" class="LineNr">2028 </span>  screen-should-contain [
-<span id="L2029" class="LineNr">2029 </span>   <span class="Constant"> .          .</span>
-<span id="L2030" class="LineNr">2030 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L2031" class="LineNr">2031 </span>   <span class="Constant"> .ef        .</span>
-<span id="L2032" class="LineNr">2032 </span>   <span class="Constant"> .g         .</span>
+<span id="L2029" class="LineNr">2029 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2030" class="LineNr">2030 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L2031" class="LineNr">2031 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L2032" class="LineNr">2032 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
 <span id="L2033" class="LineNr">2033 </span>  ]
 <span id="L2034" class="LineNr">2034 </span>  <span class="Comment"># position cursor at last line, then try to move further down</span>
 <span id="L2035" class="LineNr">2035 </span>  assume-console [
-<span id="L2036" class="LineNr">2036 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L2037" class="LineNr">2037 </span>    press down-arrow
+<span id="L2036" class="LineNr">2036 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L2037" class="LineNr">2037 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L2038" class="LineNr">2038 </span>  ]
 <span id="L2039" class="LineNr">2039 </span>  run [
-<span id="L2040" class="LineNr">2040 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2040" class="LineNr">2040 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2041" class="LineNr">2041 </span>  ]
 <span id="L2042" class="LineNr">2042 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2043" class="LineNr">2043 </span>  screen-should-contain [
-<span id="L2044" class="LineNr">2044 </span>   <span class="Constant"> .          .</span>
-<span id="L2045" class="LineNr">2045 </span>   <span class="Constant"> .ef        .</span>
-<span id="L2046" class="LineNr">2046 </span>   <span class="Constant"> .g         .</span>
-<span id="L2047" class="LineNr">2047 </span>   <span class="Constant"> .h         .</span>
+<span id="L2044" class="LineNr">2044 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2045" class="LineNr">2045 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L2046" class="LineNr">2046 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L2047" class="LineNr">2047 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
 <span id="L2048" class="LineNr">2048 </span>  ]
 <span id="L2049" class="LineNr">2049 </span>]
 <span id="L2050" class="LineNr">2050 </span>
@@ -2120,32 +2121,32 @@ if ('onhashchange' in window) {
 <span id="L2060" class="LineNr">2060 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2061" class="LineNr">2061 </span>  <span class="Comment"># position cursor at last line, then try to move further down</span>
 <span id="L2062" class="LineNr">2062 </span>  assume-console [
-<span id="L2063" class="LineNr">2063 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L2064" class="LineNr">2064 </span>    press down-arrow
+<span id="L2063" class="LineNr">2063 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L2064" class="LineNr">2064 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L2065" class="LineNr">2065 </span>  ]
 <span id="L2066" class="LineNr">2066 </span>  run [
-<span id="L2067" class="LineNr">2067 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2067" class="LineNr">2067 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2068" class="LineNr">2068 </span>  ]
 <span id="L2069" class="LineNr">2069 </span>  <span class="Comment"># screen shows partial wrapped line containing a wrap icon</span>
 <span id="L2070" class="LineNr">2070 </span>  screen-should-contain [
-<span id="L2071" class="LineNr">2071 </span>   <span class="Constant"> .          .</span>
-<span id="L2072" class="LineNr">2072 </span>   <span class="Constant"> .efgh↩     .</span>
-<span id="L2073" class="LineNr">2073 </span>   <span class="Constant"> .ij        .</span>
-<span id="L2074" class="LineNr">2074 </span>   <span class="Constant"> .k         .</span>
+<span id="L2071" class="LineNr">2071 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2072" class="LineNr">2072 </span>  <span class="Conceal">¦</span><span class="Constant"> .efgh↩     .</span>
+<span id="L2073" class="LineNr">2073 </span>  <span class="Conceal">¦</span><span class="Constant"> .ij        .</span>
+<span id="L2074" class="LineNr">2074 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
 <span id="L2075" class="LineNr">2075 </span>  ]
 <span id="L2076" class="LineNr">2076 </span>  <span class="Comment"># scroll down again</span>
 <span id="L2077" class="LineNr">2077 </span>  assume-console [
-<span id="L2078" class="LineNr">2078 </span>    press down-arrow
+<span id="L2078" class="LineNr">2078 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L2079" class="LineNr">2079 </span>  ]
 <span id="L2080" class="LineNr">2080 </span>  run [
-<span id="L2081" class="LineNr">2081 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2081" class="LineNr">2081 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2082" class="LineNr">2082 </span>  ]
 <span id="L2083" class="LineNr">2083 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2084" class="LineNr">2084 </span>  screen-should-contain [
-<span id="L2085" class="LineNr">2085 </span>   <span class="Constant"> .          .</span>
-<span id="L2086" class="LineNr">2086 </span>   <span class="Constant"> .ij        .</span>
-<span id="L2087" class="LineNr">2087 </span>   <span class="Constant"> .k         .</span>
-<span id="L2088" class="LineNr">2088 </span>   <span class="Constant"> .l         .</span>
+<span id="L2085" class="LineNr">2085 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2086" class="LineNr">2086 </span>  <span class="Conceal">¦</span><span class="Constant"> .ij        .</span>
+<span id="L2087" class="LineNr">2087 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
+<span id="L2088" class="LineNr">2088 </span>  <span class="Conceal">¦</span><span class="Constant"> .l         .</span>
 <span id="L2089" class="LineNr">2089 </span>  ]
 <span id="L2090" class="LineNr">2090 </span>]
 <span id="L2091" class="LineNr">2091 </span>
@@ -2160,24 +2161,24 @@ if ('onhashchange' in window) {
 <span id="L2100" class="LineNr">2100 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2101" class="LineNr">2101 </span>  <span class="Comment"># position cursor at end, type a character</span>
 <span id="L2102" class="LineNr">2102 </span>  assume-console [
-<span id="L2103" class="LineNr">2103 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 4</span>
-<span id="L2104" class="LineNr">2104 </span>    type <span class="Constant">[g]</span>
+<span id="L2103" class="LineNr">2103 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 4</span>
+<span id="L2104" class="LineNr">2104 </span>  <span class="Conceal">¦</span> type <span class="Constant">[g]</span>
 <span id="L2105" class="LineNr">2105 </span>  ]
 <span id="L2106" class="LineNr">2106 </span>  run [
-<span id="L2107" class="LineNr">2107 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2108" class="LineNr">2108 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2109" class="LineNr">2109 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2107" class="LineNr">2107 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2108" class="LineNr">2108 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2109" class="LineNr">2109 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2110" class="LineNr">2110 </span>  ]
 <span id="L2111" class="LineNr">2111 </span>  <span class="Comment"># screen scrolls</span>
 <span id="L2112" class="LineNr">2112 </span>  screen-should-contain [
-<span id="L2113" class="LineNr">2113 </span>   <span class="Constant"> .     .</span>
-<span id="L2114" class="LineNr">2114 </span>   <span class="Constant"> .b    .</span>
-<span id="L2115" class="LineNr">2115 </span><span class="Constant">    .cdef↩.</span>
-<span id="L2116" class="LineNr">2116 </span>   <span class="Constant"> .g    .</span>
+<span id="L2113" class="LineNr">2113 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L2114" class="LineNr">2114 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L2115" class="LineNr">2115 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .cdef↩.</span>
+<span id="L2116" class="LineNr">2116 </span>  <span class="Conceal">¦</span><span class="Constant"> .g    .</span>
 <span id="L2117" class="LineNr">2117 </span>  ]
 <span id="L2118" class="LineNr">2118 </span>  memory-should-contain [
-<span id="L2119" class="LineNr">2119 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L2120" class="LineNr">2120 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2119" class="LineNr">2119 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L2120" class="LineNr">2120 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L2121" class="LineNr">2121 </span>  ]
 <span id="L2122" class="LineNr">2122 </span>]
 <span id="L2123" class="LineNr">2123 </span>
@@ -2190,25 +2191,25 @@ if ('onhashchange' in window) {
 <span id="L2130" class="LineNr">2130 </span><span class="Constant">c]</span>
 <span id="L2131" class="LineNr">2131 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2132" class="LineNr">2132 </span>  assume-console [
-<span id="L2133" class="LineNr">2133 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 4</span>
-<span id="L2134" class="LineNr">2134 </span>    type [
+<span id="L2133" class="LineNr">2133 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 4</span>
+<span id="L2134" class="LineNr">2134 </span>  <span class="Conceal">¦</span> type [
 <span id="L2135" class="LineNr">2135 </span>]
 <span id="L2136" class="LineNr">2136 </span>  ]
 <span id="L2137" class="LineNr">2137 </span>  run [
-<span id="L2138" class="LineNr">2138 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2139" class="LineNr">2139 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2140" class="LineNr">2140 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2138" class="LineNr">2138 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2139" class="LineNr">2139 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2140" class="LineNr">2140 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2141" class="LineNr">2141 </span>  ]
 <span id="L2142" class="LineNr">2142 </span>  <span class="Comment"># screen scrolls</span>
 <span id="L2143" class="LineNr">2143 </span>  screen-should-contain [
-<span id="L2144" class="LineNr">2144 </span>   <span class="Constant"> .     .</span>
-<span id="L2145" class="LineNr">2145 </span>   <span class="Constant"> .b    .</span>
-<span id="L2146" class="LineNr">2146 </span>   <span class="Constant"> .c    .</span>
-<span id="L2147" class="LineNr">2147 </span>   <span class="Constant"> .     .</span>
+<span id="L2144" class="LineNr">2144 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L2145" class="LineNr">2145 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L2146" class="LineNr">2146 </span>  <span class="Conceal">¦</span><span class="Constant"> .c    .</span>
+<span id="L2147" class="LineNr">2147 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
 <span id="L2148" class="LineNr">2148 </span>  ]
 <span id="L2149" class="LineNr">2149 </span>  memory-should-contain [
-<span id="L2150" class="LineNr">2150 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L2151" class="LineNr">2151 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L2150" class="LineNr">2150 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L2151" class="LineNr">2151 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L2152" class="LineNr">2152 </span>  ]
 <span id="L2153" class="LineNr">2153 </span>]
 <span id="L2154" class="LineNr">2154 </span>
@@ -2223,24 +2224,24 @@ if ('onhashchange' in window) {
 <span id="L2163" class="LineNr">2163 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2164" class="LineNr">2164 </span>  <span class="Comment"># position cursor at end of screen and try to move right</span>
 <span id="L2165" class="LineNr">2165 </span>  assume-console [
-<span id="L2166" class="LineNr">2166 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
-<span id="L2167" class="LineNr">2167 </span>    press right-arrow
+<span id="L2166" class="LineNr">2166 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
+<span id="L2167" class="LineNr">2167 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L2168" class="LineNr">2168 </span>  ]
 <span id="L2169" class="LineNr">2169 </span>  run [
-<span id="L2170" class="LineNr">2170 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2171" class="LineNr">2171 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2172" class="LineNr">2172 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2170" class="LineNr">2170 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2171" class="LineNr">2171 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2172" class="LineNr">2172 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2173" class="LineNr">2173 </span>  ]
 <span id="L2174" class="LineNr">2174 </span>  <span class="Comment"># screen scrolls</span>
 <span id="L2175" class="LineNr">2175 </span>  screen-should-contain [
-<span id="L2176" class="LineNr">2176 </span>   <span class="Constant"> .     .</span>
-<span id="L2177" class="LineNr">2177 </span>   <span class="Constant"> .b    .</span>
-<span id="L2178" class="LineNr">2178 </span><span class="Constant">    .cdef↩.</span>
-<span id="L2179" class="LineNr">2179 </span>   <span class="Constant"> .gh   .</span>
+<span id="L2176" class="LineNr">2176 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L2177" class="LineNr">2177 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L2178" class="LineNr">2178 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .cdef↩.</span>
+<span id="L2179" class="LineNr">2179 </span>  <span class="Conceal">¦</span><span class="Constant"> .gh   .</span>
 <span id="L2180" class="LineNr">2180 </span>  ]
 <span id="L2181" class="LineNr">2181 </span>  memory-should-contain [
-<span id="L2182" class="LineNr">2182 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L2183" class="LineNr">2183 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L2182" class="LineNr">2182 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L2183" class="LineNr">2183 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L2184" class="LineNr">2184 </span>  ]
 <span id="L2185" class="LineNr">2185 </span>]
 <span id="L2186" class="LineNr">2186 </span>
@@ -2256,24 +2257,24 @@ if ('onhashchange' in window) {
 <span id="L2196" class="LineNr">2196 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2197" class="LineNr">2197 </span>  <span class="Comment"># position cursor at end of screen and try to move right</span>
 <span id="L2198" class="LineNr">2198 </span>  assume-console [
-<span id="L2199" class="LineNr">2199 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
-<span id="L2200" class="LineNr">2200 </span>    press right-arrow
+<span id="L2199" class="LineNr">2199 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
+<span id="L2200" class="LineNr">2200 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L2201" class="LineNr">2201 </span>  ]
 <span id="L2202" class="LineNr">2202 </span>  run [
-<span id="L2203" class="LineNr">2203 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2204" class="LineNr">2204 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2205" class="LineNr">2205 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2203" class="LineNr">2203 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2204" class="LineNr">2204 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2205" class="LineNr">2205 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2206" class="LineNr">2206 </span>  ]
 <span id="L2207" class="LineNr">2207 </span>  <span class="Comment"># screen scrolls</span>
 <span id="L2208" class="LineNr">2208 </span>  screen-should-contain [
-<span id="L2209" class="LineNr">2209 </span>   <span class="Constant"> .     .</span>
-<span id="L2210" class="LineNr">2210 </span>   <span class="Constant"> .b    .</span>
-<span id="L2211" class="LineNr">2211 </span>   <span class="Constant"> .c    .</span>
-<span id="L2212" class="LineNr">2212 </span>   <span class="Constant"> .d    .</span>
+<span id="L2209" class="LineNr">2209 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L2210" class="LineNr">2210 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L2211" class="LineNr">2211 </span>  <span class="Conceal">¦</span><span class="Constant"> .c    .</span>
+<span id="L2212" class="LineNr">2212 </span>  <span class="Conceal">¦</span><span class="Constant"> .d    .</span>
 <span id="L2213" class="LineNr">2213 </span>  ]
 <span id="L2214" class="LineNr">2214 </span>  memory-should-contain [
-<span id="L2215" class="LineNr">2215 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L2216" class="LineNr">2216 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L2215" class="LineNr">2215 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L2216" class="LineNr">2216 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L2217" class="LineNr">2217 </span>  ]
 <span id="L2218" class="LineNr">2218 </span>]
 <span id="L2219" class="LineNr">2219 </span>
@@ -2287,59 +2288,59 @@ if ('onhashchange' in window) {
 <span id="L2227" class="LineNr">2227 </span>  $clear-trace
 <span id="L2228" class="LineNr">2228 </span>  <span class="Comment"># try to move down past end of text</span>
 <span id="L2229" class="LineNr">2229 </span>  assume-console [
-<span id="L2230" class="LineNr">2230 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
-<span id="L2231" class="LineNr">2231 </span>    press down-arrow
+<span id="L2230" class="LineNr">2230 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
+<span id="L2231" class="LineNr">2231 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L2232" class="LineNr">2232 </span>  ]
 <span id="L2233" class="LineNr">2233 </span>  run [
-<span id="L2234" class="LineNr">2234 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2235" class="LineNr">2235 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2236" class="LineNr">2236 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2234" class="LineNr">2234 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2235" class="LineNr">2235 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2236" class="LineNr">2236 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2237" class="LineNr">2237 </span>  ]
 <span id="L2238" class="LineNr">2238 </span>  <span class="Comment"># screen should scroll, moving cursor to end of text</span>
 <span id="L2239" class="LineNr">2239 </span>  memory-should-contain [
-<span id="L2240" class="LineNr">2240 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L2241" class="LineNr">2241 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L2240" class="LineNr">2240 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2241" class="LineNr">2241 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L2242" class="LineNr">2242 </span>  ]
 <span id="L2243" class="LineNr">2243 </span>  assume-console [
-<span id="L2244" class="LineNr">2244 </span>    type <span class="Constant">[0]</span>
+<span id="L2244" class="LineNr">2244 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L2245" class="LineNr">2245 </span>  ]
 <span id="L2246" class="LineNr">2246 </span>  run [
-<span id="L2247" class="LineNr">2247 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2247" class="LineNr">2247 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2248" class="LineNr">2248 </span>  ]
 <span id="L2249" class="LineNr">2249 </span>  screen-should-contain [
-<span id="L2250" class="LineNr">2250 </span>   <span class="Constant"> .          .</span>
-<span id="L2251" class="LineNr">2251 </span>   <span class="Constant"> .de0       .</span>
-<span id="L2252" class="LineNr">2252 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2253" class="LineNr">2253 </span>   <span class="Constant"> .          .</span>
+<span id="L2250" class="LineNr">2250 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2251" class="LineNr">2251 </span>  <span class="Conceal">¦</span><span class="Constant"> .de0       .</span>
+<span id="L2252" class="LineNr">2252 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2253" class="LineNr">2253 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2254" class="LineNr">2254 </span>  ]
 <span id="L2255" class="LineNr">2255 </span>  <span class="Comment"># try to move down again</span>
 <span id="L2256" class="LineNr">2256 </span>  $clear-trace
 <span id="L2257" class="LineNr">2257 </span>  assume-console [
-<span id="L2258" class="LineNr">2258 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
-<span id="L2259" class="LineNr">2259 </span>    press down-arrow
+<span id="L2258" class="LineNr">2258 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 0</span>
+<span id="L2259" class="LineNr">2259 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L2260" class="LineNr">2260 </span>  ]
 <span id="L2261" class="LineNr">2261 </span>  run [
-<span id="L2262" class="LineNr">2262 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2263" class="LineNr">2263 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2264" class="LineNr">2264 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2262" class="LineNr">2262 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2263" class="LineNr">2263 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2264" class="LineNr">2264 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2265" class="LineNr">2265 </span>  ]
 <span id="L2266" class="LineNr">2266 </span>  <span class="Comment"># screen stops scrolling because cursor is already at top</span>
 <span id="L2267" class="LineNr">2267 </span>  memory-should-contain [
-<span id="L2268" class="LineNr">2268 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L2269" class="LineNr">2269 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L2268" class="LineNr">2268 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2269" class="LineNr">2269 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L2270" class="LineNr">2270 </span>  ]
 <span id="L2271" class="LineNr">2271 </span>  check-trace-count-for-label<span class="Constant"> 0</span>, <span class="Constant">[print-character]</span>
 <span id="L2272" class="LineNr">2272 </span>  assume-console [
-<span id="L2273" class="LineNr">2273 </span>    type <span class="Constant">[1]</span>
+<span id="L2273" class="LineNr">2273 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L2274" class="LineNr">2274 </span>  ]
 <span id="L2275" class="LineNr">2275 </span>  run [
-<span id="L2276" class="LineNr">2276 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2276" class="LineNr">2276 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2277" class="LineNr">2277 </span>  ]
 <span id="L2278" class="LineNr">2278 </span>  screen-should-contain [
-<span id="L2279" class="LineNr">2279 </span>   <span class="Constant"> .          .</span>
-<span id="L2280" class="LineNr">2280 </span>   <span class="Constant"> .de01      .</span>
-<span id="L2281" class="LineNr">2281 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2282" class="LineNr">2282 </span>   <span class="Constant"> .          .</span>
+<span id="L2279" class="LineNr">2279 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2280" class="LineNr">2280 </span>  <span class="Conceal">¦</span><span class="Constant"> .de01      .</span>
+<span id="L2281" class="LineNr">2281 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2282" class="LineNr">2282 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2283" class="LineNr">2283 </span>  ]
 <span id="L2284" class="LineNr">2284 </span>]
 <span id="L2285" class="LineNr">2285 </span>
@@ -2359,19 +2360,19 @@ if ('onhashchange' in window) {
 <span id="L2299" class="LineNr">2299 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2300" class="LineNr">2300 </span>  <span class="Comment"># scroll down one page and one line</span>
 <span id="L2301" class="LineNr">2301 </span>  assume-console [
-<span id="L2302" class="LineNr">2302 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L2303" class="LineNr">2303 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
-<span id="L2304" class="LineNr">2304 </span>    press down-arrow
+<span id="L2302" class="LineNr">2302 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2303" class="LineNr">2303 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 0</span>
+<span id="L2304" class="LineNr">2304 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L2305" class="LineNr">2305 </span>  ]
 <span id="L2306" class="LineNr">2306 </span>  run [
-<span id="L2307" class="LineNr">2307 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2307" class="LineNr">2307 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2308" class="LineNr">2308 </span>  ]
 <span id="L2309" class="LineNr">2309 </span>  <span class="Comment"># screen scrolls down 3 lines</span>
 <span id="L2310" class="LineNr">2310 </span>  screen-should-contain [
-<span id="L2311" class="LineNr">2311 </span>   <span class="Constant"> .          .</span>
-<span id="L2312" class="LineNr">2312 </span>   <span class="Constant"> .d         .</span>
-<span id="L2313" class="LineNr">2313 </span>   <span class="Constant"> .e         .</span>
-<span id="L2314" class="LineNr">2314 </span>   <span class="Constant"> .f         .</span>
+<span id="L2311" class="LineNr">2311 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2312" class="LineNr">2312 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L2313" class="LineNr">2313 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L2314" class="LineNr">2314 </span>  <span class="Conceal">¦</span><span class="Constant"> .f         .</span>
 <span id="L2315" class="LineNr">2315 </span>  ]
 <span id="L2316" class="LineNr">2316 </span>]
 <span id="L2317" class="LineNr">2317 </span>
@@ -2389,25 +2390,25 @@ if ('onhashchange' in window) {
 <span id="L2329" class="LineNr">2329 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L2330" class="LineNr">2330 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2331" class="LineNr">2331 </span>  screen-should-contain [
-<span id="L2332" class="LineNr">2332 </span>   <span class="Constant"> .          .</span>
-<span id="L2333" class="LineNr">2333 </span>   <span class="Constant"> .a         .</span>
-<span id="L2334" class="LineNr">2334 </span>   <span class="Constant"> .b         .</span>
-<span id="L2335" class="LineNr">2335 </span>   <span class="Constant"> .c         .</span>
+<span id="L2332" class="LineNr">2332 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2333" class="LineNr">2333 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2334" class="LineNr">2334 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2335" class="LineNr">2335 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2336" class="LineNr">2336 </span>  ]
 <span id="L2337" class="LineNr">2337 </span>  <span class="Comment"># position cursor at top of second page, then try to move up</span>
 <span id="L2338" class="LineNr">2338 </span>  assume-console [
-<span id="L2339" class="LineNr">2339 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L2340" class="LineNr">2340 </span>    press up-arrow
+<span id="L2339" class="LineNr">2339 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2340" class="LineNr">2340 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2341" class="LineNr">2341 </span>  ]
 <span id="L2342" class="LineNr">2342 </span>  run [
-<span id="L2343" class="LineNr">2343 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2343" class="LineNr">2343 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2344" class="LineNr">2344 </span>  ]
 <span id="L2345" class="LineNr">2345 </span>  <span class="Comment"># screen slides by one line</span>
 <span id="L2346" class="LineNr">2346 </span>  screen-should-contain [
-<span id="L2347" class="LineNr">2347 </span>   <span class="Constant"> .          .</span>
-<span id="L2348" class="LineNr">2348 </span>   <span class="Constant"> .b         .</span>
-<span id="L2349" class="LineNr">2349 </span>   <span class="Constant"> .c         .</span>
-<span id="L2350" class="LineNr">2350 </span>   <span class="Constant"> .d         .</span>
+<span id="L2347" class="LineNr">2347 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2348" class="LineNr">2348 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2349" class="LineNr">2349 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2350" class="LineNr">2350 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
 <span id="L2351" class="LineNr">2351 </span>  ]
 <span id="L2352" class="LineNr">2352 </span>]
 <span id="L2353" class="LineNr">2353 </span>
@@ -2438,29 +2439,29 @@ if ('onhashchange' in window) {
 <span id="L2378" class="LineNr">2378 </span>  sentinel:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
 <span id="L2379" class="LineNr">2379 </span>  len:num <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L193'>previous-line-length</a> curr, sentinel
 <span id="L2380" class="LineNr">2380 </span>  <span class="Delimiter">{</span>
-<span id="L2381" class="LineNr">2381 </span>    <span class="muControl">break-if</span> len
-<span id="L2382" class="LineNr">2382 </span>    <span class="Comment"># empty line; just skip this newline</span>
-<span id="L2383" class="LineNr">2383 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
-<span id="L2384" class="LineNr">2384 </span>    <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>, curr
-<span id="L2385" class="LineNr">2385 </span>    <span class="muControl">return</span> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L2381" class="LineNr">2381 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> len
+<span id="L2382" class="LineNr">2382 </span>  <span class="Conceal">¦</span> <span class="Comment"># empty line; just skip this newline</span>
+<span id="L2383" class="LineNr">2383 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
+<span id="L2384" class="LineNr">2384 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>, curr
+<span id="L2385" class="LineNr">2385 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <a href='../065duplex_list.mu.html#L36'>prev</a>
 <span id="L2386" class="LineNr">2386 </span>  <span class="Delimiter">}</span>
 <span id="L2387" class="LineNr">2387 </span>  _, max:num <span class="Special">&lt;-</span> divide-with-remainder len, max-line-length
 <span id="L2388" class="LineNr">2388 </span>  <span class="Comment"># remainder 0 =&gt; scan one width-worth</span>
 <span id="L2389" class="LineNr">2389 </span>  <span class="Delimiter">{</span>
-<span id="L2390" class="LineNr">2390 </span>    <span class="muControl">break-if</span> max
-<span id="L2391" class="LineNr">2391 </span>    max <span class="Special">&lt;-</span> copy max-line-length
+<span id="L2390" class="LineNr">2390 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> max
+<span id="L2391" class="LineNr">2391 </span>  <span class="Conceal">¦</span> max <span class="Special">&lt;-</span> copy max-line-length
 <span id="L2392" class="LineNr">2392 </span>  <span class="Delimiter">}</span>
 <span id="L2393" class="LineNr">2393 </span>  max <span class="Special">&lt;-</span> add max,<span class="Constant"> 1</span>
 <span id="L2394" class="LineNr">2394 </span>  count:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L2395" class="LineNr">2395 </span>  <span class="Comment"># skip 'max' characters</span>
 <span id="L2396" class="LineNr">2396 </span>  <span class="Delimiter">{</span>
-<span id="L2397" class="LineNr">2397 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal count, max
-<span id="L2398" class="LineNr">2398 </span>    <span class="muControl">break-if</span> done?
-<span id="L2399" class="LineNr">2399 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
-<span id="L2400" class="LineNr">2400 </span>    <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L2401" class="LineNr">2401 </span>    curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L2402" class="LineNr">2402 </span>    count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
-<span id="L2403" class="LineNr">2403 </span>    <span class="muControl">loop</span>
+<span id="L2397" class="LineNr">2397 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal count, max
+<span id="L2398" class="LineNr">2398 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L2399" class="LineNr">2399 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
+<span id="L2400" class="LineNr">2400 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L2401" class="LineNr">2401 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L2402" class="LineNr">2402 </span>  <span class="Conceal">¦</span> count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
+<span id="L2403" class="LineNr">2403 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L2404" class="LineNr">2404 </span>  <span class="Delimiter">}</span>
 <span id="L2405" class="LineNr">2405 </span>  <span class="muControl">return</span> curr
 <span id="L2406" class="LineNr">2406 </span>]
@@ -2478,37 +2479,37 @@ if ('onhashchange' in window) {
 <span id="L2418" class="LineNr">2418 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L2419" class="LineNr">2419 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2420" class="LineNr">2420 </span>  screen-should-contain [
-<span id="L2421" class="LineNr">2421 </span>   <span class="Constant"> .          .</span>
-<span id="L2422" class="LineNr">2422 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L2423" class="LineNr">2423 </span>   <span class="Constant"> .ef        .</span>
-<span id="L2424" class="LineNr">2424 </span>   <span class="Constant"> .g         .</span>
+<span id="L2421" class="LineNr">2421 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2422" class="LineNr">2422 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L2423" class="LineNr">2423 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L2424" class="LineNr">2424 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
 <span id="L2425" class="LineNr">2425 </span>  ]
 <span id="L2426" class="LineNr">2426 </span>  <span class="Comment"># position cursor at top of second page, just below wrapped line</span>
 <span id="L2427" class="LineNr">2427 </span>  assume-console [
-<span id="L2428" class="LineNr">2428 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2428" class="LineNr">2428 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2429" class="LineNr">2429 </span>  ]
 <span id="L2430" class="LineNr">2430 </span>  run [
-<span id="L2431" class="LineNr">2431 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2431" class="LineNr">2431 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2432" class="LineNr">2432 </span>  ]
 <span id="L2433" class="LineNr">2433 </span>  screen-should-contain [
-<span id="L2434" class="LineNr">2434 </span>   <span class="Constant"> .          .</span>
-<span id="L2435" class="LineNr">2435 </span>   <span class="Constant"> .g         .</span>
-<span id="L2436" class="LineNr">2436 </span>   <span class="Constant"> .h         .</span>
-<span id="L2437" class="LineNr">2437 </span>   <span class="Constant"> .i         .</span>
+<span id="L2434" class="LineNr">2434 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2435" class="LineNr">2435 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L2436" class="LineNr">2436 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
+<span id="L2437" class="LineNr">2437 </span>  <span class="Conceal">¦</span><span class="Constant"> .i         .</span>
 <span id="L2438" class="LineNr">2438 </span>  ]
 <span id="L2439" class="LineNr">2439 </span>  <span class="Comment"># now move up one line</span>
 <span id="L2440" class="LineNr">2440 </span>  assume-console [
-<span id="L2441" class="LineNr">2441 </span>    press up-arrow
+<span id="L2441" class="LineNr">2441 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2442" class="LineNr">2442 </span>  ]
 <span id="L2443" class="LineNr">2443 </span>  run [
-<span id="L2444" class="LineNr">2444 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2444" class="LineNr">2444 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2445" class="LineNr">2445 </span>  ]
 <span id="L2446" class="LineNr">2446 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2447" class="LineNr">2447 </span>  screen-should-contain [
-<span id="L2448" class="LineNr">2448 </span>   <span class="Constant"> .          .</span>
-<span id="L2449" class="LineNr">2449 </span>   <span class="Constant"> .ef        .</span>
-<span id="L2450" class="LineNr">2450 </span>   <span class="Constant"> .g         .</span>
-<span id="L2451" class="LineNr">2451 </span>   <span class="Constant"> .h         .</span>
+<span id="L2448" class="LineNr">2448 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2449" class="LineNr">2449 </span>  <span class="Conceal">¦</span><span class="Constant"> .ef        .</span>
+<span id="L2450" class="LineNr">2450 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L2451" class="LineNr">2451 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
 <span id="L2452" class="LineNr">2452 </span>  ]
 <span id="L2453" class="LineNr">2453 </span>]
 <span id="L2454" class="LineNr">2454 </span>
@@ -2525,62 +2526,62 @@ if ('onhashchange' in window) {
 <span id="L2465" class="LineNr">2465 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2466" class="LineNr">2466 </span>  <span class="Comment"># position cursor at top of second page</span>
 <span id="L2467" class="LineNr">2467 </span>  assume-console [
-<span id="L2468" class="LineNr">2468 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2468" class="LineNr">2468 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2469" class="LineNr">2469 </span>  ]
 <span id="L2470" class="LineNr">2470 </span>  run [
-<span id="L2471" class="LineNr">2471 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2471" class="LineNr">2471 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2472" class="LineNr">2472 </span>  ]
 <span id="L2473" class="LineNr">2473 </span>  screen-should-contain [
-<span id="L2474" class="LineNr">2474 </span>   <span class="Constant"> .          .</span>
-<span id="L2475" class="LineNr">2475 </span>   <span class="Constant"> .k         .</span>
-<span id="L2476" class="LineNr">2476 </span>   <span class="Constant"> .l         .</span>
-<span id="L2477" class="LineNr">2477 </span>   <span class="Constant"> .m         .</span>
-<span id="L2478" class="LineNr">2478 </span>   <span class="Constant"> .╌╌╌╌╌     .</span>
+<span id="L2474" class="LineNr">2474 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2475" class="LineNr">2475 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
+<span id="L2476" class="LineNr">2476 </span>  <span class="Conceal">¦</span><span class="Constant"> .l         .</span>
+<span id="L2477" class="LineNr">2477 </span>  <span class="Conceal">¦</span><span class="Constant"> .m         .</span>
+<span id="L2478" class="LineNr">2478 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌     .</span>
 <span id="L2479" class="LineNr">2479 </span>  ]
 <span id="L2480" class="LineNr">2480 </span>  <span class="Comment"># move up one line</span>
 <span id="L2481" class="LineNr">2481 </span>  assume-console [
-<span id="L2482" class="LineNr">2482 </span>    press up-arrow
+<span id="L2482" class="LineNr">2482 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2483" class="LineNr">2483 </span>  ]
 <span id="L2484" class="LineNr">2484 </span>  run [
-<span id="L2485" class="LineNr">2485 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2485" class="LineNr">2485 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2486" class="LineNr">2486 </span>  ]
 <span id="L2487" class="LineNr">2487 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2488" class="LineNr">2488 </span>  screen-should-contain [
-<span id="L2489" class="LineNr">2489 </span>   <span class="Constant"> .          .</span>
-<span id="L2490" class="LineNr">2490 </span>   <span class="Constant"> .ij        .</span>
-<span id="L2491" class="LineNr">2491 </span>   <span class="Constant"> .k         .</span>
-<span id="L2492" class="LineNr">2492 </span>   <span class="Constant"> .l         .</span>
-<span id="L2493" class="LineNr">2493 </span>   <span class="Constant"> .m         .</span>
+<span id="L2489" class="LineNr">2489 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2490" class="LineNr">2490 </span>  <span class="Conceal">¦</span><span class="Constant"> .ij        .</span>
+<span id="L2491" class="LineNr">2491 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
+<span id="L2492" class="LineNr">2492 </span>  <span class="Conceal">¦</span><span class="Constant"> .l         .</span>
+<span id="L2493" class="LineNr">2493 </span>  <span class="Conceal">¦</span><span class="Constant"> .m         .</span>
 <span id="L2494" class="LineNr">2494 </span>  ]
 <span id="L2495" class="LineNr">2495 </span>  <span class="Comment"># move up a second line</span>
 <span id="L2496" class="LineNr">2496 </span>  assume-console [
-<span id="L2497" class="LineNr">2497 </span>    press up-arrow
+<span id="L2497" class="LineNr">2497 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2498" class="LineNr">2498 </span>  ]
 <span id="L2499" class="LineNr">2499 </span>  run [
-<span id="L2500" class="LineNr">2500 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2500" class="LineNr">2500 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2501" class="LineNr">2501 </span>  ]
 <span id="L2502" class="LineNr">2502 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2503" class="LineNr">2503 </span>  screen-should-contain [
-<span id="L2504" class="LineNr">2504 </span>   <span class="Constant"> .          .</span>
-<span id="L2505" class="LineNr">2505 </span>   <span class="Constant"> .efgh↩     .</span>
-<span id="L2506" class="LineNr">2506 </span>   <span class="Constant"> .ij        .</span>
-<span id="L2507" class="LineNr">2507 </span>   <span class="Constant"> .k         .</span>
-<span id="L2508" class="LineNr">2508 </span>   <span class="Constant"> .l         .</span>
+<span id="L2504" class="LineNr">2504 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2505" class="LineNr">2505 </span>  <span class="Conceal">¦</span><span class="Constant"> .efgh↩     .</span>
+<span id="L2506" class="LineNr">2506 </span>  <span class="Conceal">¦</span><span class="Constant"> .ij        .</span>
+<span id="L2507" class="LineNr">2507 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
+<span id="L2508" class="LineNr">2508 </span>  <span class="Conceal">¦</span><span class="Constant"> .l         .</span>
 <span id="L2509" class="LineNr">2509 </span>  ]
 <span id="L2510" class="LineNr">2510 </span>  <span class="Comment"># move up a third line</span>
 <span id="L2511" class="LineNr">2511 </span>  assume-console [
-<span id="L2512" class="LineNr">2512 </span>    press up-arrow
+<span id="L2512" class="LineNr">2512 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2513" class="LineNr">2513 </span>  ]
 <span id="L2514" class="LineNr">2514 </span>  run [
-<span id="L2515" class="LineNr">2515 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2515" class="LineNr">2515 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2516" class="LineNr">2516 </span>  ]
 <span id="L2517" class="LineNr">2517 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2518" class="LineNr">2518 </span>  screen-should-contain [
-<span id="L2519" class="LineNr">2519 </span>   <span class="Constant"> .          .</span>
-<span id="L2520" class="LineNr">2520 </span>   <span class="Constant"> .abcd↩     .</span>
-<span id="L2521" class="LineNr">2521 </span>   <span class="Constant"> .efgh↩     .</span>
-<span id="L2522" class="LineNr">2522 </span>   <span class="Constant"> .ij        .</span>
-<span id="L2523" class="LineNr">2523 </span>   <span class="Constant"> .k         .</span>
+<span id="L2519" class="LineNr">2519 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2520" class="LineNr">2520 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcd↩     .</span>
+<span id="L2521" class="LineNr">2521 </span>  <span class="Conceal">¦</span><span class="Constant"> .efgh↩     .</span>
+<span id="L2522" class="LineNr">2522 </span>  <span class="Conceal">¦</span><span class="Constant"> .ij        .</span>
+<span id="L2523" class="LineNr">2523 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
 <span id="L2524" class="LineNr">2524 </span>  ]
 <span id="L2525" class="LineNr">2525 </span>]
 <span id="L2526" class="LineNr">2526 </span>
@@ -2599,37 +2600,37 @@ if ('onhashchange' in window) {
 <span id="L2539" class="LineNr">2539 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">6/right</span>
 <span id="L2540" class="LineNr">2540 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2541" class="LineNr">2541 </span>  screen-should-contain [
-<span id="L2542" class="LineNr">2542 </span>   <span class="Constant"> .          .</span>
-<span id="L2543" class="LineNr">2543 </span>   <span class="Constant"> .abcde↩    .</span>
-<span id="L2544" class="LineNr">2544 </span>   <span class="Constant"> .f         .</span>
-<span id="L2545" class="LineNr">2545 </span>   <span class="Constant"> .g         .</span>
+<span id="L2542" class="LineNr">2542 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2543" class="LineNr">2543 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcde↩    .</span>
+<span id="L2544" class="LineNr">2544 </span>  <span class="Conceal">¦</span><span class="Constant"> .f         .</span>
+<span id="L2545" class="LineNr">2545 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
 <span id="L2546" class="LineNr">2546 </span>  ]
 <span id="L2547" class="LineNr">2547 </span>  <span class="Comment"># position cursor at top of second page, just below wrapped line</span>
 <span id="L2548" class="LineNr">2548 </span>  assume-console [
-<span id="L2549" class="LineNr">2549 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2549" class="LineNr">2549 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2550" class="LineNr">2550 </span>  ]
 <span id="L2551" class="LineNr">2551 </span>  run [
-<span id="L2552" class="LineNr">2552 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2552" class="LineNr">2552 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2553" class="LineNr">2553 </span>  ]
 <span id="L2554" class="LineNr">2554 </span>  screen-should-contain [
-<span id="L2555" class="LineNr">2555 </span>   <span class="Constant"> .          .</span>
-<span id="L2556" class="LineNr">2556 </span>   <span class="Constant"> .g         .</span>
-<span id="L2557" class="LineNr">2557 </span>   <span class="Constant"> .h         .</span>
-<span id="L2558" class="LineNr">2558 </span>   <span class="Constant"> .i         .</span>
+<span id="L2555" class="LineNr">2555 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2556" class="LineNr">2556 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L2557" class="LineNr">2557 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
+<span id="L2558" class="LineNr">2558 </span>  <span class="Conceal">¦</span><span class="Constant"> .i         .</span>
 <span id="L2559" class="LineNr">2559 </span>  ]
 <span id="L2560" class="LineNr">2560 </span>  <span class="Comment"># now move up one line</span>
 <span id="L2561" class="LineNr">2561 </span>  assume-console [
-<span id="L2562" class="LineNr">2562 </span>    press up-arrow
+<span id="L2562" class="LineNr">2562 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2563" class="LineNr">2563 </span>  ]
 <span id="L2564" class="LineNr">2564 </span>  run [
-<span id="L2565" class="LineNr">2565 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2565" class="LineNr">2565 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2566" class="LineNr">2566 </span>  ]
 <span id="L2567" class="LineNr">2567 </span>  <span class="Comment"># screen shows partial wrapped line</span>
 <span id="L2568" class="LineNr">2568 </span>  screen-should-contain [
-<span id="L2569" class="LineNr">2569 </span>   <span class="Constant"> .          .</span>
-<span id="L2570" class="LineNr">2570 </span>   <span class="Constant"> .f         .</span>
-<span id="L2571" class="LineNr">2571 </span>   <span class="Constant"> .g         .</span>
-<span id="L2572" class="LineNr">2572 </span>   <span class="Constant"> .h         .</span>
+<span id="L2569" class="LineNr">2569 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2570" class="LineNr">2570 </span>  <span class="Conceal">¦</span><span class="Constant"> .f         .</span>
+<span id="L2571" class="LineNr">2571 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
+<span id="L2572" class="LineNr">2572 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
 <span id="L2573" class="LineNr">2573 </span>  ]
 <span id="L2574" class="LineNr">2574 </span>]
 <span id="L2575" class="LineNr">2575 </span>
@@ -2647,40 +2648,40 @@ if ('onhashchange' in window) {
 <span id="L2587" class="LineNr">2587 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">6/right</span>
 <span id="L2588" class="LineNr">2588 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2589" class="LineNr">2589 </span>  assume-console [
-<span id="L2590" class="LineNr">2590 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2590" class="LineNr">2590 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2591" class="LineNr">2591 </span>  ]
 <span id="L2592" class="LineNr">2592 </span>  run [
-<span id="L2593" class="LineNr">2593 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2593" class="LineNr">2593 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2594" class="LineNr">2594 </span>  ]
 <span id="L2595" class="LineNr">2595 </span>  screen-should-contain [
-<span id="L2596" class="LineNr">2596 </span>   <span class="Constant"> .          .</span>
-<span id="L2597" class="LineNr">2597 </span>   <span class="Constant"> .          .</span>
-<span id="L2598" class="LineNr">2598 </span>   <span class="Constant"> .c         .</span>
-<span id="L2599" class="LineNr">2599 </span>   <span class="Constant"> .d         .</span>
+<span id="L2596" class="LineNr">2596 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2597" class="LineNr">2597 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2598" class="LineNr">2598 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2599" class="LineNr">2599 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
 <span id="L2600" class="LineNr">2600 </span>  ]
 <span id="L2601" class="LineNr">2601 </span>  assume-console [
-<span id="L2602" class="LineNr">2602 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2602" class="LineNr">2602 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2603" class="LineNr">2603 </span>  ]
 <span id="L2604" class="LineNr">2604 </span>  run [
-<span id="L2605" class="LineNr">2605 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2605" class="LineNr">2605 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2606" class="LineNr">2606 </span>  ]
 <span id="L2607" class="LineNr">2607 </span>  screen-should-contain [
-<span id="L2608" class="LineNr">2608 </span>   <span class="Constant"> .          .</span>
-<span id="L2609" class="LineNr">2609 </span>   <span class="Constant"> .d         .</span>
-<span id="L2610" class="LineNr">2610 </span>   <span class="Constant"> .e         .</span>
-<span id="L2611" class="LineNr">2611 </span>   <span class="Constant"> .╌╌╌╌╌╌    .</span>
+<span id="L2608" class="LineNr">2608 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2609" class="LineNr">2609 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L2610" class="LineNr">2610 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L2611" class="LineNr">2611 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌    .</span>
 <span id="L2612" class="LineNr">2612 </span>  ]
 <span id="L2613" class="LineNr">2613 </span>  assume-console [
-<span id="L2614" class="LineNr">2614 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L2614" class="LineNr">2614 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L2615" class="LineNr">2615 </span>  ]
 <span id="L2616" class="LineNr">2616 </span>  run [
-<span id="L2617" class="LineNr">2617 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2617" class="LineNr">2617 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2618" class="LineNr">2618 </span>  ]
 <span id="L2619" class="LineNr">2619 </span>  screen-should-contain [
-<span id="L2620" class="LineNr">2620 </span>   <span class="Constant"> .          .</span>
-<span id="L2621" class="LineNr">2621 </span>   <span class="Constant"> .          .</span>
-<span id="L2622" class="LineNr">2622 </span>   <span class="Constant"> .c         .</span>
-<span id="L2623" class="LineNr">2623 </span>   <span class="Constant"> .d         .</span>
+<span id="L2620" class="LineNr">2620 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2621" class="LineNr">2621 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2622" class="LineNr">2622 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2623" class="LineNr">2623 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
 <span id="L2624" class="LineNr">2624 </span>  ]
 <span id="L2625" class="LineNr">2625 </span>]
 <span id="L2626" class="LineNr">2626 </span>
@@ -2698,36 +2699,36 @@ if ('onhashchange' in window) {
 <span id="L2638" class="LineNr">2638 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2639" class="LineNr">2639 </span>  <span class="Comment"># position cursor at top of second page</span>
 <span id="L2640" class="LineNr">2640 </span>  assume-console [
-<span id="L2641" class="LineNr">2641 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2641" class="LineNr">2641 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2642" class="LineNr">2642 </span>  ]
 <span id="L2643" class="LineNr">2643 </span>  run [
-<span id="L2644" class="LineNr">2644 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2644" class="LineNr">2644 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2645" class="LineNr">2645 </span>  ]
 <span id="L2646" class="LineNr">2646 </span>  screen-should-contain [
-<span id="L2647" class="LineNr">2647 </span>   <span class="Constant"> .     .</span>
-<span id="L2648" class="LineNr">2648 </span>   <span class="Constant"> .c    .</span>
-<span id="L2649" class="LineNr">2649 </span>   <span class="Constant"> .d    .</span>
-<span id="L2650" class="LineNr">2650 </span>   <span class="Constant"> .e    .</span>
+<span id="L2647" class="LineNr">2647 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L2648" class="LineNr">2648 </span>  <span class="Conceal">¦</span><span class="Constant"> .c    .</span>
+<span id="L2649" class="LineNr">2649 </span>  <span class="Conceal">¦</span><span class="Constant"> .d    .</span>
+<span id="L2650" class="LineNr">2650 </span>  <span class="Conceal">¦</span><span class="Constant"> .e    .</span>
 <span id="L2651" class="LineNr">2651 </span>  ]
 <span id="L2652" class="LineNr">2652 </span>  <span class="Comment"># now try to move left</span>
 <span id="L2653" class="LineNr">2653 </span>  assume-console [
-<span id="L2654" class="LineNr">2654 </span>    press left-arrow
+<span id="L2654" class="LineNr">2654 </span>  <span class="Conceal">¦</span> press left-arrow
 <span id="L2655" class="LineNr">2655 </span>  ]
 <span id="L2656" class="LineNr">2656 </span>  run [
-<span id="L2657" class="LineNr">2657 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L2658" class="LineNr">2658 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L2659" class="LineNr">2659 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L2657" class="LineNr">2657 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2658" class="LineNr">2658 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L2659" class="LineNr">2659 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2660" class="LineNr">2660 </span>  ]
 <span id="L2661" class="LineNr">2661 </span>  <span class="Comment"># screen scrolls</span>
 <span id="L2662" class="LineNr">2662 </span>  screen-should-contain [
-<span id="L2663" class="LineNr">2663 </span>   <span class="Constant"> .     .</span>
-<span id="L2664" class="LineNr">2664 </span>   <span class="Constant"> .b    .</span>
-<span id="L2665" class="LineNr">2665 </span>   <span class="Constant"> .c    .</span>
-<span id="L2666" class="LineNr">2666 </span>   <span class="Constant"> .d    .</span>
+<span id="L2663" class="LineNr">2663 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L2664" class="LineNr">2664 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L2665" class="LineNr">2665 </span>  <span class="Conceal">¦</span><span class="Constant"> .c    .</span>
+<span id="L2666" class="LineNr">2666 </span>  <span class="Conceal">¦</span><span class="Constant"> .d    .</span>
 <span id="L2667" class="LineNr">2667 </span>  ]
 <span id="L2668" class="LineNr">2668 </span>  memory-should-contain [
-<span id="L2669" class="LineNr">2669 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L2670" class="LineNr">2670 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2669" class="LineNr">2669 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2670" class="LineNr">2670 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L2671" class="LineNr">2671 </span>  ]
 <span id="L2672" class="LineNr">2672 </span>]
 <span id="L2673" class="LineNr">2673 </span>
@@ -2743,41 +2744,41 @@ if ('onhashchange' in window) {
 <span id="L2683" class="LineNr">2683 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L2684" class="LineNr">2684 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2685" class="LineNr">2685 </span>  screen-should-contain [
-<span id="L2686" class="LineNr">2686 </span>   <span class="Constant"> .          .</span>
-<span id="L2687" class="LineNr">2687 </span>   <span class="Constant"> .a         .</span>
-<span id="L2688" class="LineNr">2688 </span>   <span class="Constant"> .b         .</span>
-<span id="L2689" class="LineNr">2689 </span>   <span class="Constant"> .c         .</span>
+<span id="L2686" class="LineNr">2686 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2687" class="LineNr">2687 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2688" class="LineNr">2688 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2689" class="LineNr">2689 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2690" class="LineNr">2690 </span>  ]
 <span id="L2691" class="LineNr">2691 </span>  <span class="Comment"># position cursor at top of second page, then try to move up to start of</span>
 <span id="L2692" class="LineNr">2692 </span>  <span class="Comment"># text</span>
 <span id="L2693" class="LineNr">2693 </span>  assume-console [
-<span id="L2694" class="LineNr">2694 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L2695" class="LineNr">2695 </span>    press up-arrow
-<span id="L2696" class="LineNr">2696 </span>    press up-arrow
+<span id="L2694" class="LineNr">2694 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2695" class="LineNr">2695 </span>  <span class="Conceal">¦</span> press up-arrow
+<span id="L2696" class="LineNr">2696 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2697" class="LineNr">2697 </span>  ]
 <span id="L2698" class="LineNr">2698 </span>  run [
-<span id="L2699" class="LineNr">2699 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2699" class="LineNr">2699 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2700" class="LineNr">2700 </span>  ]
 <span id="L2701" class="LineNr">2701 </span>  <span class="Comment"># screen slides by one line</span>
 <span id="L2702" class="LineNr">2702 </span>  screen-should-contain [
-<span id="L2703" class="LineNr">2703 </span>   <span class="Constant"> .          .</span>
-<span id="L2704" class="LineNr">2704 </span>   <span class="Constant"> .a         .</span>
-<span id="L2705" class="LineNr">2705 </span>   <span class="Constant"> .b         .</span>
-<span id="L2706" class="LineNr">2706 </span>   <span class="Constant"> .c         .</span>
+<span id="L2703" class="LineNr">2703 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2704" class="LineNr">2704 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2705" class="LineNr">2705 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2706" class="LineNr">2706 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2707" class="LineNr">2707 </span>  ]
 <span id="L2708" class="LineNr">2708 </span>  <span class="Comment"># try to move up again</span>
 <span id="L2709" class="LineNr">2709 </span>  assume-console [
-<span id="L2710" class="LineNr">2710 </span>    press up-arrow
+<span id="L2710" class="LineNr">2710 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L2711" class="LineNr">2711 </span>  ]
 <span id="L2712" class="LineNr">2712 </span>  run [
-<span id="L2713" class="LineNr">2713 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2713" class="LineNr">2713 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2714" class="LineNr">2714 </span>  ]
 <span id="L2715" class="LineNr">2715 </span>  <span class="Comment"># screen remains unchanged</span>
 <span id="L2716" class="LineNr">2716 </span>  screen-should-contain [
-<span id="L2717" class="LineNr">2717 </span>   <span class="Constant"> .          .</span>
-<span id="L2718" class="LineNr">2718 </span>   <span class="Constant"> .a         .</span>
-<span id="L2719" class="LineNr">2719 </span>   <span class="Constant"> .b         .</span>
-<span id="L2720" class="LineNr">2720 </span>   <span class="Constant"> .c         .</span>
+<span id="L2717" class="LineNr">2717 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2718" class="LineNr">2718 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2719" class="LineNr">2719 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2720" class="LineNr">2720 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2721" class="LineNr">2721 </span>  ]
 <span id="L2722" class="LineNr">2722 </span>]
 <span id="L2723" class="LineNr">2723 </span>
@@ -2793,54 +2794,54 @@ if ('onhashchange' in window) {
 <span id="L2733" class="LineNr">2733 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L2734" class="LineNr">2734 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2735" class="LineNr">2735 </span>  screen-should-contain [
-<span id="L2736" class="LineNr">2736 </span>   <span class="Constant"> .          .</span>
-<span id="L2737" class="LineNr">2737 </span>   <span class="Constant"> .a         .</span>
-<span id="L2738" class="LineNr">2738 </span>   <span class="Constant"> .b         .</span>
-<span id="L2739" class="LineNr">2739 </span>   <span class="Constant"> .c         .</span>
+<span id="L2736" class="LineNr">2736 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2737" class="LineNr">2737 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2738" class="LineNr">2738 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2739" class="LineNr">2739 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2740" class="LineNr">2740 </span>  ]
 <span id="L2741" class="LineNr">2741 </span>  <span class="Comment"># scroll down</span>
 <span id="L2742" class="LineNr">2742 </span>  assume-console [
-<span id="L2743" class="LineNr">2743 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2743" class="LineNr">2743 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2744" class="LineNr">2744 </span>  ]
 <span id="L2745" class="LineNr">2745 </span>  run [
-<span id="L2746" class="LineNr">2746 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2746" class="LineNr">2746 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2747" class="LineNr">2747 </span>  ]
 <span id="L2748" class="LineNr">2748 </span>  <span class="Comment"># screen shows next page</span>
 <span id="L2749" class="LineNr">2749 </span>  screen-should-contain [
-<span id="L2750" class="LineNr">2750 </span>   <span class="Constant"> .          .</span>
-<span id="L2751" class="LineNr">2751 </span>   <span class="Constant"> .c         .</span>
-<span id="L2752" class="LineNr">2752 </span>   <span class="Constant"> .d         .</span>
-<span id="L2753" class="LineNr">2753 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2750" class="LineNr">2750 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2751" class="LineNr">2751 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2752" class="LineNr">2752 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L2753" class="LineNr">2753 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L2754" class="LineNr">2754 </span>  ]
 <span id="L2755" class="LineNr">2755 </span>]
 <span id="L2756" class="LineNr">2756 </span>
 <span id="L2757" class="LineNr">2757 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L2758" class="LineNr">2758 </span>  <span class="Delimiter">{</span>
-<span id="L2759" class="LineNr">2759 </span>    page-down?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">6/ctrl-f</span>
-<span id="L2760" class="LineNr">2760 </span>    <span class="muControl">break-unless</span> page-down?
-<span id="L2761" class="LineNr">2761 </span>    old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2762" class="LineNr">2762 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L2763" class="LineNr">2763 </span>    <a href='003-shortcuts.mu.html#L2789'>page-down</a> editor
-<span id="L2764" class="LineNr">2764 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L2765" class="LineNr">2765 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L2766" class="LineNr">2766 </span>    top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2767" class="LineNr">2767 </span>    movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
-<span id="L2768" class="LineNr">2768 </span>    <span class="muControl">return</span> movement?/go-render
+<span id="L2759" class="LineNr">2759 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">6/ctrl-f</span>
+<span id="L2760" class="LineNr">2760 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-down?
+<span id="L2761" class="LineNr">2761 </span>  <span class="Conceal">¦</span> old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2762" class="LineNr">2762 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L2763" class="LineNr">2763 </span>  <span class="Conceal">¦</span> <a href='003-shortcuts.mu.html#L2789'>page-down</a> editor
+<span id="L2764" class="LineNr">2764 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L2765" class="LineNr">2765 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L2766" class="LineNr">2766 </span>  <span class="Conceal">¦</span> top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2767" class="LineNr">2767 </span>  <span class="Conceal">¦</span> movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
+<span id="L2768" class="LineNr">2768 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> movement?/go-render
 <span id="L2769" class="LineNr">2769 </span>  <span class="Delimiter">}</span>
 <span id="L2770" class="LineNr">2770 </span>]
 <span id="L2771" class="LineNr">2771 </span>
 <span id="L2772" class="LineNr">2772 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L2773" class="LineNr">2773 </span>  <span class="Delimiter">{</span>
-<span id="L2774" class="LineNr">2774 </span>    page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
-<span id="L2775" class="LineNr">2775 </span>    <span class="muControl">break-unless</span> page-down?
-<span id="L2776" class="LineNr">2776 </span>    old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2777" class="LineNr">2777 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L2778" class="LineNr">2778 </span>    <a href='003-shortcuts.mu.html#L2789'>page-down</a> editor
-<span id="L2779" class="LineNr">2779 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L2780" class="LineNr">2780 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L2781" class="LineNr">2781 </span>    top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2782" class="LineNr">2782 </span>    movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
-<span id="L2783" class="LineNr">2783 </span>    <span class="muControl">return</span> movement?/go-render
+<span id="L2774" class="LineNr">2774 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
+<span id="L2775" class="LineNr">2775 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-down?
+<span id="L2776" class="LineNr">2776 </span>  <span class="Conceal">¦</span> old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2777" class="LineNr">2777 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L2778" class="LineNr">2778 </span>  <span class="Conceal">¦</span> <a href='003-shortcuts.mu.html#L2789'>page-down</a> editor
+<span id="L2779" class="LineNr">2779 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L2780" class="LineNr">2780 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L2781" class="LineNr">2781 </span>  <span class="Conceal">¦</span> top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2782" class="LineNr">2782 </span>  <span class="Conceal">¦</span> movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
+<span id="L2783" class="LineNr">2783 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> movement?/go-render
 <span id="L2784" class="LineNr">2784 </span>  <span class="Delimiter">}</span>
 <span id="L2785" class="LineNr">2785 </span>]
 <span id="L2786" class="LineNr">2786 </span>
@@ -2858,11 +2859,11 @@ if ('onhashchange' in window) {
 <span id="L2798" class="LineNr">2798 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
 <span id="L2799" class="LineNr">2799 </span>  <span class="Comment"># keep one line in common with previous page</span>
 <span id="L2800" class="LineNr">2800 </span>  <span class="Delimiter">{</span>
-<span id="L2801" class="LineNr">2801 </span>    <a href='../065duplex_list.mu.html#L516'>last</a>:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
-<span id="L2802" class="LineNr">2802 </span>    newline?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L516'>last</a>, <span class="Constant">10/newline</span>
-<span id="L2803" class="LineNr">2803 </span>    <span class="muControl">break-unless</span> newline?:bool
-<span id="L2804" class="LineNr">2804 </span>    before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
-<span id="L2805" class="LineNr">2805 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L2801" class="LineNr">2801 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L516'>last</a>:char <span class="Special">&lt;-</span> get *before-cursor, <span class="Constant">value:offset</span>
+<span id="L2802" class="LineNr">2802 </span>  <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L516'>last</a>, <span class="Constant">10/newline</span>
+<span id="L2803" class="LineNr">2803 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?:bool
+<span id="L2804" class="LineNr">2804 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> before-cursor
+<span id="L2805" class="LineNr">2805 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
 <span id="L2806" class="LineNr">2806 </span>  <span class="Delimiter">}</span>
 <span id="L2807" class="LineNr">2807 </span>  <span class="Comment"># move cursor and top-of-screen to start of that line</span>
 <span id="L2808" class="LineNr">2808 </span>  <a href='003-shortcuts.mu.html#L1350'>move-to-start-of-line</a> editor
@@ -2878,24 +2879,24 @@ if ('onhashchange' in window) {
 <span id="L2818" class="LineNr">2818 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L2819" class="LineNr">2819 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2820" class="LineNr">2820 </span>  screen-should-contain [
-<span id="L2821" class="LineNr">2821 </span>   <span class="Constant"> .          .</span>
-<span id="L2822" class="LineNr">2822 </span>   <span class="Constant"> .a         .</span>
-<span id="L2823" class="LineNr">2823 </span>   <span class="Constant"> .b         .</span>
-<span id="L2824" class="LineNr">2824 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2821" class="LineNr">2821 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2822" class="LineNr">2822 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2823" class="LineNr">2823 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2824" class="LineNr">2824 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L2825" class="LineNr">2825 </span>  ]
 <span id="L2826" class="LineNr">2826 </span>  <span class="Comment"># scroll down</span>
 <span id="L2827" class="LineNr">2827 </span>  assume-console [
-<span id="L2828" class="LineNr">2828 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2828" class="LineNr">2828 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2829" class="LineNr">2829 </span>  ]
 <span id="L2830" class="LineNr">2830 </span>  run [
-<span id="L2831" class="LineNr">2831 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2831" class="LineNr">2831 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2832" class="LineNr">2832 </span>  ]
 <span id="L2833" class="LineNr">2833 </span>  <span class="Comment"># screen remains unmodified</span>
 <span id="L2834" class="LineNr">2834 </span>  screen-should-contain [
-<span id="L2835" class="LineNr">2835 </span>   <span class="Constant"> .          .</span>
-<span id="L2836" class="LineNr">2836 </span>   <span class="Constant"> .a         .</span>
-<span id="L2837" class="LineNr">2837 </span>   <span class="Constant"> .b         .</span>
-<span id="L2838" class="LineNr">2838 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2835" class="LineNr">2835 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2836" class="LineNr">2836 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2837" class="LineNr">2837 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2838" class="LineNr">2838 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L2839" class="LineNr">2839 </span>  ]
 <span id="L2840" class="LineNr">2840 </span>]
 <span id="L2841" class="LineNr">2841 </span>
@@ -2912,24 +2913,24 @@ if ('onhashchange' in window) {
 <span id="L2852" class="LineNr">2852 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2853" class="LineNr">2853 </span>  <span class="Comment"># some part of last line is not displayed</span>
 <span id="L2854" class="LineNr">2854 </span>  screen-should-contain [
-<span id="L2855" class="LineNr">2855 </span>   <span class="Constant"> .          .</span>
-<span id="L2856" class="LineNr">2856 </span>   <span class="Constant"> .a         .</span>
-<span id="L2857" class="LineNr">2857 </span>   <span class="Constant"> .b         .</span>
-<span id="L2858" class="LineNr">2858 </span>   <span class="Constant"> .cde↩      .</span>
+<span id="L2855" class="LineNr">2855 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2856" class="LineNr">2856 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2857" class="LineNr">2857 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2858" class="LineNr">2858 </span>  <span class="Conceal">¦</span><span class="Constant"> .cde↩      .</span>
 <span id="L2859" class="LineNr">2859 </span>  ]
 <span id="L2860" class="LineNr">2860 </span>  <span class="Comment"># scroll down</span>
 <span id="L2861" class="LineNr">2861 </span>  assume-console [
-<span id="L2862" class="LineNr">2862 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2862" class="LineNr">2862 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2863" class="LineNr">2863 </span>  ]
 <span id="L2864" class="LineNr">2864 </span>  run [
-<span id="L2865" class="LineNr">2865 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2865" class="LineNr">2865 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2866" class="LineNr">2866 </span>  ]
 <span id="L2867" class="LineNr">2867 </span>  <span class="Comment"># screen shows entire wrapped line</span>
 <span id="L2868" class="LineNr">2868 </span>  screen-should-contain [
-<span id="L2869" class="LineNr">2869 </span>   <span class="Constant"> .          .</span>
-<span id="L2870" class="LineNr">2870 </span>   <span class="Constant"> .cde↩      .</span>
-<span id="L2871" class="LineNr">2871 </span>   <span class="Constant"> .fgh       .</span>
-<span id="L2872" class="LineNr">2872 </span>   <span class="Constant"> .╌╌╌╌      .</span>
+<span id="L2869" class="LineNr">2869 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2870" class="LineNr">2870 </span>  <span class="Conceal">¦</span><span class="Constant"> .cde↩      .</span>
+<span id="L2871" class="LineNr">2871 </span>  <span class="Conceal">¦</span><span class="Constant"> .fgh       .</span>
+<span id="L2872" class="LineNr">2872 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌      .</span>
 <span id="L2873" class="LineNr">2873 </span>  ]
 <span id="L2874" class="LineNr">2874 </span>]
 <span id="L2875" class="LineNr">2875 </span>
@@ -2945,24 +2946,24 @@ if ('onhashchange' in window) {
 <span id="L2885" class="LineNr">2885 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2886" class="LineNr">2886 </span>  <span class="Comment"># some part of last line is not displayed</span>
 <span id="L2887" class="LineNr">2887 </span>  screen-should-contain [
-<span id="L2888" class="LineNr">2888 </span>   <span class="Constant"> .          .</span>
-<span id="L2889" class="LineNr">2889 </span>   <span class="Constant"> .a         .</span>
-<span id="L2890" class="LineNr">2890 </span>   <span class="Constant"> .bcd↩      .</span>
-<span id="L2891" class="LineNr">2891 </span>   <span class="Constant"> .efg↩      .</span>
+<span id="L2888" class="LineNr">2888 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2889" class="LineNr">2889 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2890" class="LineNr">2890 </span>  <span class="Conceal">¦</span><span class="Constant"> .bcd↩      .</span>
+<span id="L2891" class="LineNr">2891 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg↩      .</span>
 <span id="L2892" class="LineNr">2892 </span>  ]
 <span id="L2893" class="LineNr">2893 </span>  <span class="Comment"># scroll down</span>
 <span id="L2894" class="LineNr">2894 </span>  assume-console [
-<span id="L2895" class="LineNr">2895 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2895" class="LineNr">2895 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2896" class="LineNr">2896 </span>  ]
 <span id="L2897" class="LineNr">2897 </span>  run [
-<span id="L2898" class="LineNr">2898 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2898" class="LineNr">2898 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2899" class="LineNr">2899 </span>  ]
 <span id="L2900" class="LineNr">2900 </span>  <span class="Comment"># screen shows entire wrapped line</span>
 <span id="L2901" class="LineNr">2901 </span>  screen-should-contain [
-<span id="L2902" class="LineNr">2902 </span>   <span class="Constant"> .          .</span>
-<span id="L2903" class="LineNr">2903 </span>   <span class="Constant"> .bcd↩      .</span>
-<span id="L2904" class="LineNr">2904 </span>   <span class="Constant"> .efg↩      .</span>
-<span id="L2905" class="LineNr">2905 </span>   <span class="Constant"> .h         .</span>
+<span id="L2902" class="LineNr">2902 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2903" class="LineNr">2903 </span>  <span class="Conceal">¦</span><span class="Constant"> .bcd↩      .</span>
+<span id="L2904" class="LineNr">2904 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg↩      .</span>
+<span id="L2905" class="LineNr">2905 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
 <span id="L2906" class="LineNr">2906 </span>  ]
 <span id="L2907" class="LineNr">2907 </span>]
 <span id="L2908" class="LineNr">2908 </span>
@@ -2978,69 +2979,69 @@ if ('onhashchange' in window) {
 <span id="L2918" class="LineNr">2918 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L2919" class="LineNr">2919 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2920" class="LineNr">2920 </span>  screen-should-contain [
-<span id="L2921" class="LineNr">2921 </span>   <span class="Constant"> .          .</span>
-<span id="L2922" class="LineNr">2922 </span>   <span class="Constant"> .a         .</span>
-<span id="L2923" class="LineNr">2923 </span>   <span class="Constant"> .b         .</span>
-<span id="L2924" class="LineNr">2924 </span>   <span class="Constant"> .c         .</span>
+<span id="L2921" class="LineNr">2921 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2922" class="LineNr">2922 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2923" class="LineNr">2923 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2924" class="LineNr">2924 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2925" class="LineNr">2925 </span>  ]
 <span id="L2926" class="LineNr">2926 </span>  <span class="Comment"># scroll down</span>
 <span id="L2927" class="LineNr">2927 </span>  assume-console [
-<span id="L2928" class="LineNr">2928 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L2928" class="LineNr">2928 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L2929" class="LineNr">2929 </span>  ]
 <span id="L2930" class="LineNr">2930 </span>  run [
-<span id="L2931" class="LineNr">2931 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2931" class="LineNr">2931 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2932" class="LineNr">2932 </span>  ]
 <span id="L2933" class="LineNr">2933 </span>  <span class="Comment"># screen shows next page</span>
 <span id="L2934" class="LineNr">2934 </span>  screen-should-contain [
-<span id="L2935" class="LineNr">2935 </span>   <span class="Constant"> .          .</span>
-<span id="L2936" class="LineNr">2936 </span>   <span class="Constant"> .c         .</span>
-<span id="L2937" class="LineNr">2937 </span>   <span class="Constant"> .d         .</span>
-<span id="L2938" class="LineNr">2938 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2935" class="LineNr">2935 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2936" class="LineNr">2936 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2937" class="LineNr">2937 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L2938" class="LineNr">2938 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L2939" class="LineNr">2939 </span>  ]
 <span id="L2940" class="LineNr">2940 </span>  <span class="Comment"># scroll back up</span>
 <span id="L2941" class="LineNr">2941 </span>  assume-console [
-<span id="L2942" class="LineNr">2942 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L2942" class="LineNr">2942 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L2943" class="LineNr">2943 </span>  ]
 <span id="L2944" class="LineNr">2944 </span>  run [
-<span id="L2945" class="LineNr">2945 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2945" class="LineNr">2945 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2946" class="LineNr">2946 </span>  ]
 <span id="L2947" class="LineNr">2947 </span>  <span class="Comment"># screen shows original page again</span>
 <span id="L2948" class="LineNr">2948 </span>  screen-should-contain [
-<span id="L2949" class="LineNr">2949 </span>   <span class="Constant"> .          .</span>
-<span id="L2950" class="LineNr">2950 </span>   <span class="Constant"> .a         .</span>
-<span id="L2951" class="LineNr">2951 </span>   <span class="Constant"> .b         .</span>
-<span id="L2952" class="LineNr">2952 </span>   <span class="Constant"> .c         .</span>
+<span id="L2949" class="LineNr">2949 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2950" class="LineNr">2950 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L2951" class="LineNr">2951 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L2952" class="LineNr">2952 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L2953" class="LineNr">2953 </span>  ]
 <span id="L2954" class="LineNr">2954 </span>]
 <span id="L2955" class="LineNr">2955 </span>
 <span id="L2956" class="LineNr">2956 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L2957" class="LineNr">2957 </span>  <span class="Delimiter">{</span>
-<span id="L2958" class="LineNr">2958 </span>    page-up?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">2/ctrl-b</span>
-<span id="L2959" class="LineNr">2959 </span>    <span class="muControl">break-unless</span> page-up?
-<span id="L2960" class="LineNr">2960 </span>    old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2961" class="LineNr">2961 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L2962" class="LineNr">2962 </span>    editor <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2987'>page-up</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L2963" class="LineNr">2963 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L2964" class="LineNr">2964 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L2965" class="LineNr">2965 </span>    top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2966" class="LineNr">2966 </span>    movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
-<span id="L2967" class="LineNr">2967 </span>    <span class="muControl">return</span> movement?/go-render
+<span id="L2958" class="LineNr">2958 </span>  <span class="Conceal">¦</span> page-up?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">2/ctrl-b</span>
+<span id="L2959" class="LineNr">2959 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-up?
+<span id="L2960" class="LineNr">2960 </span>  <span class="Conceal">¦</span> old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2961" class="LineNr">2961 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L2962" class="LineNr">2962 </span>  <span class="Conceal">¦</span> editor <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2987'>page-up</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L2963" class="LineNr">2963 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L2964" class="LineNr">2964 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L2965" class="LineNr">2965 </span>  <span class="Conceal">¦</span> top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2966" class="LineNr">2966 </span>  <span class="Conceal">¦</span> movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
+<span id="L2967" class="LineNr">2967 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> movement?/go-render
 <span id="L2968" class="LineNr">2968 </span>  <span class="Delimiter">}</span>
 <span id="L2969" class="LineNr">2969 </span>]
 <span id="L2970" class="LineNr">2970 </span>
 <span id="L2971" class="LineNr">2971 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L197'>&lt;handle-special-key&gt;</a></span> [
 <span id="L2972" class="LineNr">2972 </span>  <span class="Delimiter">{</span>
-<span id="L2973" class="LineNr">2973 </span>    page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
-<span id="L2974" class="LineNr">2974 </span>    <span class="muControl">break-unless</span> page-up?
-<span id="L2975" class="LineNr">2975 </span>    old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2976" class="LineNr">2976 </span><span class="Constant">    &lt;move-cursor-begin&gt;</span>
-<span id="L2977" class="LineNr">2977 </span>    editor <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2987'>page-up</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L2978" class="LineNr">2978 </span>    undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
-<span id="L2979" class="LineNr">2979 </span><span class="Constant">    &lt;move-cursor-end&gt;</span>
-<span id="L2980" class="LineNr">2980 </span>    top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2981" class="LineNr">2981 </span>    movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
-<span id="L2982" class="LineNr">2982 </span>    <span class="Comment"># don't bother re-rendering if nothing changed. todo: test this</span>
-<span id="L2983" class="LineNr">2983 </span>    <span class="muControl">return</span> movement?/go-render
+<span id="L2973" class="LineNr">2973 </span>  <span class="Conceal">¦</span> page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
+<span id="L2974" class="LineNr">2974 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-up?
+<span id="L2975" class="LineNr">2975 </span>  <span class="Conceal">¦</span> old-top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2976" class="LineNr">2976 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-begin&gt;</span>
+<span id="L2977" class="LineNr">2977 </span>  <span class="Conceal">¦</span> editor <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2987'>page-up</a> editor, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L2978" class="LineNr">2978 </span>  <span class="Conceal">¦</span> undo-coalesce-tag:num <span class="Special">&lt;-</span> copy <span class="Constant">0/never</span>
+<span id="L2979" class="LineNr">2979 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;move-cursor-end&gt;</span>
+<span id="L2980" class="LineNr">2980 </span>  <span class="Conceal">¦</span> top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2981" class="LineNr">2981 </span>  <span class="Conceal">¦</span> movement?:bool <span class="Special">&lt;-</span> not-equal top-of-screen, old-top
+<span id="L2982" class="LineNr">2982 </span>  <span class="Conceal">¦</span> <span class="Comment"># don't bother re-rendering if nothing changed. todo: test this</span>
+<span id="L2983" class="LineNr">2983 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> movement?/go-render
 <span id="L2984" class="LineNr">2984 </span>  <span class="Delimiter">}</span>
 <span id="L2985" class="LineNr">2985 </span>]
 <span id="L2986" class="LineNr">2986 </span>
@@ -3051,14 +3052,14 @@ if ('onhashchange' in window) {
 <span id="L2991" class="LineNr">2991 </span>  count:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L2992" class="LineNr">2992 </span>  top-of-screen:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
 <span id="L2993" class="LineNr">2993 </span>  <span class="Delimiter">{</span>
-<span id="L2994" class="LineNr">2994 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal count, max
-<span id="L2995" class="LineNr">2995 </span>    <span class="muControl">break-if</span> done?
-<span id="L2996" class="LineNr">2996 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2367'>before-previous-line</a> top-of-screen, editor
-<span id="L2997" class="LineNr">2997 </span>    <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L2998" class="LineNr">2998 </span>    top-of-screen <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L2999" class="LineNr">2999 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top-of-screen
-<span id="L3000" class="LineNr">3000 </span>    count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
-<span id="L3001" class="LineNr">3001 </span>    <span class="muControl">loop</span>
+<span id="L2994" class="LineNr">2994 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal count, max
+<span id="L2995" class="LineNr">2995 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L2996" class="LineNr">2996 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='003-shortcuts.mu.html#L2367'>before-previous-line</a> top-of-screen, editor
+<span id="L2997" class="LineNr">2997 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L2998" class="LineNr">2998 </span>  <span class="Conceal">¦</span> top-of-screen <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L2999" class="LineNr">2999 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top-of-screen
+<span id="L3000" class="LineNr">3000 </span>  <span class="Conceal">¦</span> count <span class="Special">&lt;-</span> add count,<span class="Constant"> 1</span>
+<span id="L3001" class="LineNr">3001 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L3002" class="LineNr">3002 </span>  <span class="Delimiter">}</span>
 <span id="L3003" class="LineNr">3003 </span>]
 <span id="L3004" class="LineNr">3004 </span>
@@ -3078,53 +3079,53 @@ if ('onhashchange' in window) {
 <span id="L3018" class="LineNr">3018 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L3019" class="LineNr">3019 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L3020" class="LineNr">3020 </span>  screen-should-contain [
-<span id="L3021" class="LineNr">3021 </span>   <span class="Constant"> .          .</span>
-<span id="L3022" class="LineNr">3022 </span>   <span class="Constant"> .a         .</span>
-<span id="L3023" class="LineNr">3023 </span>   <span class="Constant"> .b         .</span>
-<span id="L3024" class="LineNr">3024 </span>   <span class="Constant"> .c         .</span>
+<span id="L3021" class="LineNr">3021 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3022" class="LineNr">3022 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L3023" class="LineNr">3023 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L3024" class="LineNr">3024 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L3025" class="LineNr">3025 </span>  ]
 <span id="L3026" class="LineNr">3026 </span>  <span class="Comment"># scroll down two pages</span>
 <span id="L3027" class="LineNr">3027 </span>  assume-console [
-<span id="L3028" class="LineNr">3028 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L3029" class="LineNr">3029 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3028" class="LineNr">3028 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3029" class="LineNr">3029 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L3030" class="LineNr">3030 </span>  ]
 <span id="L3031" class="LineNr">3031 </span>  run [
-<span id="L3032" class="LineNr">3032 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3032" class="LineNr">3032 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3033" class="LineNr">3033 </span>  ]
 <span id="L3034" class="LineNr">3034 </span>  <span class="Comment"># screen shows third page</span>
 <span id="L3035" class="LineNr">3035 </span>  screen-should-contain [
-<span id="L3036" class="LineNr">3036 </span>   <span class="Constant"> .          .</span>
-<span id="L3037" class="LineNr">3037 </span>   <span class="Constant"> .e         .</span>
-<span id="L3038" class="LineNr">3038 </span>   <span class="Constant"> .f         .</span>
-<span id="L3039" class="LineNr">3039 </span>   <span class="Constant"> .g         .</span>
+<span id="L3036" class="LineNr">3036 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3037" class="LineNr">3037 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L3038" class="LineNr">3038 </span>  <span class="Conceal">¦</span><span class="Constant"> .f         .</span>
+<span id="L3039" class="LineNr">3039 </span>  <span class="Conceal">¦</span><span class="Constant"> .g         .</span>
 <span id="L3040" class="LineNr">3040 </span>  ]
 <span id="L3041" class="LineNr">3041 </span>  <span class="Comment"># scroll up</span>
 <span id="L3042" class="LineNr">3042 </span>  assume-console [
-<span id="L3043" class="LineNr">3043 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L3043" class="LineNr">3043 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L3044" class="LineNr">3044 </span>  ]
 <span id="L3045" class="LineNr">3045 </span>  run [
-<span id="L3046" class="LineNr">3046 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3046" class="LineNr">3046 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3047" class="LineNr">3047 </span>  ]
 <span id="L3048" class="LineNr">3048 </span>  <span class="Comment"># screen shows second page</span>
 <span id="L3049" class="LineNr">3049 </span>  screen-should-contain [
-<span id="L3050" class="LineNr">3050 </span>   <span class="Constant"> .          .</span>
-<span id="L3051" class="LineNr">3051 </span>   <span class="Constant"> .c         .</span>
-<span id="L3052" class="LineNr">3052 </span>   <span class="Constant"> .d         .</span>
-<span id="L3053" class="LineNr">3053 </span>   <span class="Constant"> .e         .</span>
+<span id="L3050" class="LineNr">3050 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3051" class="LineNr">3051 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L3052" class="LineNr">3052 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L3053" class="LineNr">3053 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
 <span id="L3054" class="LineNr">3054 </span>  ]
 <span id="L3055" class="LineNr">3055 </span>  <span class="Comment"># scroll up again</span>
 <span id="L3056" class="LineNr">3056 </span>  assume-console [
-<span id="L3057" class="LineNr">3057 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L3057" class="LineNr">3057 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L3058" class="LineNr">3058 </span>  ]
 <span id="L3059" class="LineNr">3059 </span>  run [
-<span id="L3060" class="LineNr">3060 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3060" class="LineNr">3060 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3061" class="LineNr">3061 </span>  ]
 <span id="L3062" class="LineNr">3062 </span>  <span class="Comment"># screen shows original page again</span>
 <span id="L3063" class="LineNr">3063 </span>  screen-should-contain [
-<span id="L3064" class="LineNr">3064 </span>   <span class="Constant"> .          .</span>
-<span id="L3065" class="LineNr">3065 </span>   <span class="Constant"> .a         .</span>
-<span id="L3066" class="LineNr">3066 </span>   <span class="Constant"> .b         .</span>
-<span id="L3067" class="LineNr">3067 </span>   <span class="Constant"> .c         .</span>
+<span id="L3064" class="LineNr">3064 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3065" class="LineNr">3065 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L3066" class="LineNr">3066 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L3067" class="LineNr">3067 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
 <span id="L3068" class="LineNr">3068 </span>  ]
 <span id="L3069" class="LineNr">3069 </span>]
 <span id="L3070" class="LineNr">3070 </span>
@@ -3148,46 +3149,46 @@ if ('onhashchange' in window) {
 <span id="L3088" class="LineNr">3088 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L3089" class="LineNr">3089 </span>  <span class="Comment"># some part of last line is not displayed</span>
 <span id="L3090" class="LineNr">3090 </span>  screen-should-contain [
-<span id="L3091" class="LineNr">3091 </span>   <span class="Constant"> .          .</span>
-<span id="L3092" class="LineNr">3092 </span>   <span class="Constant"> .a         .</span>
-<span id="L3093" class="LineNr">3093 </span>   <span class="Constant"> .b         .</span>
-<span id="L3094" class="LineNr">3094 </span>   <span class="Constant"> .cde↩      .</span>
-<span id="L3095" class="LineNr">3095 </span>   <span class="Constant"> .fgh       .</span>
-<span id="L3096" class="LineNr">3096 </span>   <span class="Constant"> .i         .</span>
+<span id="L3091" class="LineNr">3091 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3092" class="LineNr">3092 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L3093" class="LineNr">3093 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L3094" class="LineNr">3094 </span>  <span class="Conceal">¦</span><span class="Constant"> .cde↩      .</span>
+<span id="L3095" class="LineNr">3095 </span>  <span class="Conceal">¦</span><span class="Constant"> .fgh       .</span>
+<span id="L3096" class="LineNr">3096 </span>  <span class="Conceal">¦</span><span class="Constant"> .i         .</span>
 <span id="L3097" class="LineNr">3097 </span>  ]
 <span id="L3098" class="LineNr">3098 </span>  <span class="Comment"># scroll down a page and a line</span>
 <span id="L3099" class="LineNr">3099 </span>  assume-console [
-<span id="L3100" class="LineNr">3100 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L3101" class="LineNr">3101 </span>    left-click<span class="Constant"> 5</span>,<span class="Constant"> 0</span>
-<span id="L3102" class="LineNr">3102 </span>    press down-arrow
+<span id="L3100" class="LineNr">3100 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3101" class="LineNr">3101 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 5</span>,<span class="Constant"> 0</span>
+<span id="L3102" class="LineNr">3102 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L3103" class="LineNr">3103 </span>  ]
 <span id="L3104" class="LineNr">3104 </span>  run [
-<span id="L3105" class="LineNr">3105 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3105" class="LineNr">3105 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3106" class="LineNr">3106 </span>  ]
 <span id="L3107" class="LineNr">3107 </span>  <span class="Comment"># screen shows entire wrapped line</span>
 <span id="L3108" class="LineNr">3108 </span>  screen-should-contain [
-<span id="L3109" class="LineNr">3109 </span>   <span class="Constant"> .          .</span>
-<span id="L3110" class="LineNr">3110 </span>   <span class="Constant"> .j         .</span>
-<span id="L3111" class="LineNr">3111 </span>   <span class="Constant"> .k         .</span>
-<span id="L3112" class="LineNr">3112 </span>   <span class="Constant"> .l         .</span>
-<span id="L3113" class="LineNr">3113 </span>   <span class="Constant"> .m         .</span>
-<span id="L3114" class="LineNr">3114 </span>   <span class="Constant"> .n         .</span>
+<span id="L3109" class="LineNr">3109 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3110" class="LineNr">3110 </span>  <span class="Conceal">¦</span><span class="Constant"> .j         .</span>
+<span id="L3111" class="LineNr">3111 </span>  <span class="Conceal">¦</span><span class="Constant"> .k         .</span>
+<span id="L3112" class="LineNr">3112 </span>  <span class="Conceal">¦</span><span class="Constant"> .l         .</span>
+<span id="L3113" class="LineNr">3113 </span>  <span class="Conceal">¦</span><span class="Constant"> .m         .</span>
+<span id="L3114" class="LineNr">3114 </span>  <span class="Conceal">¦</span><span class="Constant"> .n         .</span>
 <span id="L3115" class="LineNr">3115 </span>  ]
 <span id="L3116" class="LineNr">3116 </span>  <span class="Comment"># now scroll up one page</span>
 <span id="L3117" class="LineNr">3117 </span>  assume-console [
-<span id="L3118" class="LineNr">3118 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L3118" class="LineNr">3118 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L3119" class="LineNr">3119 </span>  ]
 <span id="L3120" class="LineNr">3120 </span>  run [
-<span id="L3121" class="LineNr">3121 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3121" class="LineNr">3121 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3122" class="LineNr">3122 </span>  ]
 <span id="L3123" class="LineNr">3123 </span>  <span class="Comment"># screen resets</span>
 <span id="L3124" class="LineNr">3124 </span>  screen-should-contain [
-<span id="L3125" class="LineNr">3125 </span>   <span class="Constant"> .          .</span>
-<span id="L3126" class="LineNr">3126 </span>   <span class="Constant"> .b         .</span>
-<span id="L3127" class="LineNr">3127 </span>   <span class="Constant"> .cde↩      .</span>
-<span id="L3128" class="LineNr">3128 </span>   <span class="Constant"> .fgh       .</span>
-<span id="L3129" class="LineNr">3129 </span>   <span class="Constant"> .i         .</span>
-<span id="L3130" class="LineNr">3130 </span>   <span class="Constant"> .j         .</span>
+<span id="L3125" class="LineNr">3125 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3126" class="LineNr">3126 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L3127" class="LineNr">3127 </span>  <span class="Conceal">¦</span><span class="Constant"> .cde↩      .</span>
+<span id="L3128" class="LineNr">3128 </span>  <span class="Conceal">¦</span><span class="Constant"> .fgh       .</span>
+<span id="L3129" class="LineNr">3129 </span>  <span class="Conceal">¦</span><span class="Constant"> .i         .</span>
+<span id="L3130" class="LineNr">3130 </span>  <span class="Conceal">¦</span><span class="Constant"> .j         .</span>
 <span id="L3131" class="LineNr">3131 </span>  ]
 <span id="L3132" class="LineNr">3132 </span>]
 <span id="L3133" class="LineNr">3133 </span>
@@ -3203,38 +3204,38 @@ if ('onhashchange' in window) {
 <span id="L3143" class="LineNr">3143 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L3144" class="LineNr">3144 </span>  <span class="Comment"># some part of last line is not displayed</span>
 <span id="L3145" class="LineNr">3145 </span>  screen-should-contain [
-<span id="L3146" class="LineNr">3146 </span>   <span class="Constant"> .          .</span>
-<span id="L3147" class="LineNr">3147 </span>   <span class="Constant"> .a         .</span>
-<span id="L3148" class="LineNr">3148 </span>   <span class="Constant"> .bcd↩      .</span>
-<span id="L3149" class="LineNr">3149 </span>   <span class="Constant"> .efg↩      .</span>
+<span id="L3146" class="LineNr">3146 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3147" class="LineNr">3147 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L3148" class="LineNr">3148 </span>  <span class="Conceal">¦</span><span class="Constant"> .bcd↩      .</span>
+<span id="L3149" class="LineNr">3149 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg↩      .</span>
 <span id="L3150" class="LineNr">3150 </span>  ]
 <span id="L3151" class="LineNr">3151 </span>  <span class="Comment"># scroll down</span>
 <span id="L3152" class="LineNr">3152 </span>  assume-console [
-<span id="L3153" class="LineNr">3153 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3153" class="LineNr">3153 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L3154" class="LineNr">3154 </span>  ]
 <span id="L3155" class="LineNr">3155 </span>  run [
-<span id="L3156" class="LineNr">3156 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3156" class="LineNr">3156 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3157" class="LineNr">3157 </span>  ]
 <span id="L3158" class="LineNr">3158 </span>  <span class="Comment"># screen shows entire wrapped line</span>
 <span id="L3159" class="LineNr">3159 </span>  screen-should-contain [
-<span id="L3160" class="LineNr">3160 </span>   <span class="Constant"> .          .</span>
-<span id="L3161" class="LineNr">3161 </span>   <span class="Constant"> .bcd↩      .</span>
-<span id="L3162" class="LineNr">3162 </span>   <span class="Constant"> .efg↩      .</span>
-<span id="L3163" class="LineNr">3163 </span>   <span class="Constant"> .h         .</span>
+<span id="L3160" class="LineNr">3160 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3161" class="LineNr">3161 </span>  <span class="Conceal">¦</span><span class="Constant"> .bcd↩      .</span>
+<span id="L3162" class="LineNr">3162 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg↩      .</span>
+<span id="L3163" class="LineNr">3163 </span>  <span class="Conceal">¦</span><span class="Constant"> .h         .</span>
 <span id="L3164" class="LineNr">3164 </span>  ]
 <span id="L3165" class="LineNr">3165 </span>  <span class="Comment"># scroll back up</span>
 <span id="L3166" class="LineNr">3166 </span>  assume-console [
-<span id="L3167" class="LineNr">3167 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L3167" class="LineNr">3167 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L3168" class="LineNr">3168 </span>  ]
 <span id="L3169" class="LineNr">3169 </span>  run [
-<span id="L3170" class="LineNr">3170 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3170" class="LineNr">3170 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3171" class="LineNr">3171 </span>  ]
 <span id="L3172" class="LineNr">3172 </span>  <span class="Comment"># screen resets</span>
 <span id="L3173" class="LineNr">3173 </span>  screen-should-contain [
-<span id="L3174" class="LineNr">3174 </span>   <span class="Constant"> .          .</span>
-<span id="L3175" class="LineNr">3175 </span>   <span class="Constant"> .a         .</span>
-<span id="L3176" class="LineNr">3176 </span>   <span class="Constant"> .bcd↩      .</span>
-<span id="L3177" class="LineNr">3177 </span>   <span class="Constant"> .efg↩      .</span>
+<span id="L3174" class="LineNr">3174 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3175" class="LineNr">3175 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L3176" class="LineNr">3176 </span>  <span class="Conceal">¦</span><span class="Constant"> .bcd↩      .</span>
+<span id="L3177" class="LineNr">3177 </span>  <span class="Conceal">¦</span><span class="Constant"> .efg↩      .</span>
 <span id="L3178" class="LineNr">3178 </span>  ]
 <span id="L3179" class="LineNr">3179 </span>]
 <span id="L3180" class="LineNr">3180 </span>
@@ -3254,47 +3255,47 @@ if ('onhashchange' in window) {
 <span id="L3194" class="LineNr">3194 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
 <span id="L3195" class="LineNr">3195 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L3196" class="LineNr">3196 </span>  screen-should-contain [
-<span id="L3197" class="LineNr">3197 </span>   <span class="Constant"> .          .</span>
-<span id="L3198" class="LineNr">3198 </span>   <span class="Constant"> .axx       .</span>
-<span id="L3199" class="LineNr">3199 </span>   <span class="Constant"> .bxx       .</span>
-<span id="L3200" class="LineNr">3200 </span>   <span class="Constant"> .cxx       .</span>
+<span id="L3197" class="LineNr">3197 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3198" class="LineNr">3198 </span>  <span class="Conceal">¦</span><span class="Constant"> .axx       .</span>
+<span id="L3199" class="LineNr">3199 </span>  <span class="Conceal">¦</span><span class="Constant"> .bxx       .</span>
+<span id="L3200" class="LineNr">3200 </span>  <span class="Conceal">¦</span><span class="Constant"> .cxx       .</span>
 <span id="L3201" class="LineNr">3201 </span>  ]
 <span id="L3202" class="LineNr">3202 </span>  assume-console [
-<span id="L3203" class="LineNr">3203 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3203" class="LineNr">3203 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L3204" class="LineNr">3204 </span>  ]
 <span id="L3205" class="LineNr">3205 </span>  run [
-<span id="L3206" class="LineNr">3206 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3206" class="LineNr">3206 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3207" class="LineNr">3207 </span>  ]
 <span id="L3208" class="LineNr">3208 </span>  screen-should-contain [
-<span id="L3209" class="LineNr">3209 </span>   <span class="Constant"> .          .</span>
-<span id="L3210" class="LineNr">3210 </span>   <span class="Constant"> .cxx       .</span>
-<span id="L3211" class="LineNr">3211 </span>   <span class="Constant"> .dxx       .</span>
-<span id="L3212" class="LineNr">3212 </span>   <span class="Constant"> .exx       .</span>
+<span id="L3209" class="LineNr">3209 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3210" class="LineNr">3210 </span>  <span class="Conceal">¦</span><span class="Constant"> .cxx       .</span>
+<span id="L3211" class="LineNr">3211 </span>  <span class="Conceal">¦</span><span class="Constant"> .dxx       .</span>
+<span id="L3212" class="LineNr">3212 </span>  <span class="Conceal">¦</span><span class="Constant"> .exx       .</span>
 <span id="L3213" class="LineNr">3213 </span>  ]
 <span id="L3214" class="LineNr">3214 </span>  assume-console [
-<span id="L3215" class="LineNr">3215 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3215" class="LineNr">3215 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L3216" class="LineNr">3216 </span>  ]
 <span id="L3217" class="LineNr">3217 </span>  run [
-<span id="L3218" class="LineNr">3218 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3218" class="LineNr">3218 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3219" class="LineNr">3219 </span>  ]
 <span id="L3220" class="LineNr">3220 </span>  screen-should-contain [
-<span id="L3221" class="LineNr">3221 </span>   <span class="Constant"> .          .</span>
-<span id="L3222" class="LineNr">3222 </span>   <span class="Constant"> .exx       .</span>
-<span id="L3223" class="LineNr">3223 </span>   <span class="Constant"> .fxx       .</span>
-<span id="L3224" class="LineNr">3224 </span>   <span class="Constant"> .gxx       .</span>
+<span id="L3221" class="LineNr">3221 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3222" class="LineNr">3222 </span>  <span class="Conceal">¦</span><span class="Constant"> .exx       .</span>
+<span id="L3223" class="LineNr">3223 </span>  <span class="Conceal">¦</span><span class="Constant"> .fxx       .</span>
+<span id="L3224" class="LineNr">3224 </span>  <span class="Conceal">¦</span><span class="Constant"> .gxx       .</span>
 <span id="L3225" class="LineNr">3225 </span>  ]
 <span id="L3226" class="LineNr">3226 </span>  <span class="Comment"># scroll back up past empty line</span>
 <span id="L3227" class="LineNr">3227 </span>  assume-console [
-<span id="L3228" class="LineNr">3228 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L3228" class="LineNr">3228 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L3229" class="LineNr">3229 </span>  ]
 <span id="L3230" class="LineNr">3230 </span>  run [
-<span id="L3231" class="LineNr">3231 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3231" class="LineNr">3231 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3232" class="LineNr">3232 </span>  ]
 <span id="L3233" class="LineNr">3233 </span>  screen-should-contain [
-<span id="L3234" class="LineNr">3234 </span>   <span class="Constant"> .          .</span>
-<span id="L3235" class="LineNr">3235 </span>   <span class="Constant"> .cxx       .</span>
-<span id="L3236" class="LineNr">3236 </span>   <span class="Constant"> .dxx       .</span>
-<span id="L3237" class="LineNr">3237 </span>   <span class="Constant"> .exx       .</span>
+<span id="L3234" class="LineNr">3234 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3235" class="LineNr">3235 </span>  <span class="Conceal">¦</span><span class="Constant"> .cxx       .</span>
+<span id="L3236" class="LineNr">3236 </span>  <span class="Conceal">¦</span><span class="Constant"> .dxx       .</span>
+<span id="L3237" class="LineNr">3237 </span>  <span class="Conceal">¦</span><span class="Constant"> .exx       .</span>
 <span id="L3238" class="LineNr">3238 </span>  ]
 <span id="L3239" class="LineNr">3239 </span>]
 <span id="L3240" class="LineNr">3240 </span>
@@ -3314,47 +3315,47 @@ if ('onhashchange' in window) {
 <span id="L3254" class="LineNr">3254 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">4/right</span>
 <span id="L3255" class="LineNr">3255 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L3256" class="LineNr">3256 </span>  screen-should-contain [
-<span id="L3257" class="LineNr">3257 </span>   <span class="Constant"> .          .</span>
-<span id="L3258" class="LineNr">3258 </span>   <span class="Constant"> .axy       .</span>
-<span id="L3259" class="LineNr">3259 </span>   <span class="Constant"> .bxy       .</span>
-<span id="L3260" class="LineNr">3260 </span>   <span class="Constant"> .cxy       .</span>
+<span id="L3257" class="LineNr">3257 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3258" class="LineNr">3258 </span>  <span class="Conceal">¦</span><span class="Constant"> .axy       .</span>
+<span id="L3259" class="LineNr">3259 </span>  <span class="Conceal">¦</span><span class="Constant"> .bxy       .</span>
+<span id="L3260" class="LineNr">3260 </span>  <span class="Conceal">¦</span><span class="Constant"> .cxy       .</span>
 <span id="L3261" class="LineNr">3261 </span>  ]
 <span id="L3262" class="LineNr">3262 </span>  assume-console [
-<span id="L3263" class="LineNr">3263 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3263" class="LineNr">3263 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L3264" class="LineNr">3264 </span>  ]
 <span id="L3265" class="LineNr">3265 </span>  run [
-<span id="L3266" class="LineNr">3266 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3266" class="LineNr">3266 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3267" class="LineNr">3267 </span>  ]
 <span id="L3268" class="LineNr">3268 </span>  screen-should-contain [
-<span id="L3269" class="LineNr">3269 </span>   <span class="Constant"> .          .</span>
-<span id="L3270" class="LineNr">3270 </span>   <span class="Constant"> .cxy       .</span>
-<span id="L3271" class="LineNr">3271 </span>   <span class="Constant"> .          .</span>
-<span id="L3272" class="LineNr">3272 </span>   <span class="Constant"> .dxy       .</span>
+<span id="L3269" class="LineNr">3269 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3270" class="LineNr">3270 </span>  <span class="Conceal">¦</span><span class="Constant"> .cxy       .</span>
+<span id="L3271" class="LineNr">3271 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3272" class="LineNr">3272 </span>  <span class="Conceal">¦</span><span class="Constant"> .dxy       .</span>
 <span id="L3273" class="LineNr">3273 </span>  ]
 <span id="L3274" class="LineNr">3274 </span>  assume-console [
-<span id="L3275" class="LineNr">3275 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L3275" class="LineNr">3275 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L3276" class="LineNr">3276 </span>  ]
 <span id="L3277" class="LineNr">3277 </span>  run [
-<span id="L3278" class="LineNr">3278 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3278" class="LineNr">3278 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3279" class="LineNr">3279 </span>  ]
 <span id="L3280" class="LineNr">3280 </span>  screen-should-contain [
-<span id="L3281" class="LineNr">3281 </span>   <span class="Constant"> .          .</span>
-<span id="L3282" class="LineNr">3282 </span>   <span class="Constant"> .dxy       .</span>
-<span id="L3283" class="LineNr">3283 </span>   <span class="Constant"> .exy       .</span>
-<span id="L3284" class="LineNr">3284 </span>   <span class="Constant"> .fxy       .</span>
+<span id="L3281" class="LineNr">3281 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3282" class="LineNr">3282 </span>  <span class="Conceal">¦</span><span class="Constant"> .dxy       .</span>
+<span id="L3283" class="LineNr">3283 </span>  <span class="Conceal">¦</span><span class="Constant"> .exy       .</span>
+<span id="L3284" class="LineNr">3284 </span>  <span class="Conceal">¦</span><span class="Constant"> .fxy       .</span>
 <span id="L3285" class="LineNr">3285 </span>  ]
 <span id="L3286" class="LineNr">3286 </span>  <span class="Comment"># scroll back up past empty line</span>
 <span id="L3287" class="LineNr">3287 </span>  assume-console [
-<span id="L3288" class="LineNr">3288 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L3288" class="LineNr">3288 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L3289" class="LineNr">3289 </span>  ]
 <span id="L3290" class="LineNr">3290 </span>  run [
-<span id="L3291" class="LineNr">3291 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L3291" class="LineNr">3291 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L3292" class="LineNr">3292 </span>  ]
 <span id="L3293" class="LineNr">3293 </span>  screen-should-contain [
-<span id="L3294" class="LineNr">3294 </span>   <span class="Constant"> .          .</span>
-<span id="L3295" class="LineNr">3295 </span>   <span class="Constant"> .cxy       .</span>
-<span id="L3296" class="LineNr">3296 </span>   <span class="Constant"> .          .</span>
-<span id="L3297" class="LineNr">3297 </span>   <span class="Constant"> .dxy       .</span>
+<span id="L3294" class="LineNr">3294 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3295" class="LineNr">3295 </span>  <span class="Conceal">¦</span><span class="Constant"> .cxy       .</span>
+<span id="L3296" class="LineNr">3296 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L3297" class="LineNr">3297 </span>  <span class="Conceal">¦</span><span class="Constant"> .dxy       .</span>
 <span id="L3298" class="LineNr">3298 </span>  ]
 <span id="L3299" class="LineNr">3299 </span>]
 </pre>
diff --git a/html/edit/004-programming-environment.mu.html b/html/edit/004-programming-environment.mu.html
index 86601105..350af5ac 100644
--- a/html/edit/004-programming-environment.mu.html
+++ b/html/edit/004-programming-environment.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -108,128 +109,128 @@ if ('onhashchange' in window) {
 <span id="L47" class="LineNr"> 47 </span>  <span class="Comment"># todo: test this</span>
 <span id="L48" class="LineNr"> 48 </span>  render-all-on-no-more-events?:bool <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
 <span id="L49" class="LineNr"> 49 </span>  <span class="Delimiter">{</span>
-<span id="L50" class="LineNr"> 50 </span>    <span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
-<span id="L51" class="LineNr"> 51 </span><span class="Constant">    +next-event</span>
-<span id="L52" class="LineNr"> 52 </span>    e:<a href='../084console.mu.html#L4'>event</a>, found?:bool, quit?:bool, <a href='../084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='../084console.mu.html#L35'>read-event</a> <a href='../084console.mu.html#L23'>console</a>
-<span id="L53" class="LineNr"> 53 </span>    <span class="muControl">loop-unless</span> found?
-<span id="L54" class="LineNr"> 54 </span>    <span class="muControl">break-if</span> quit?  <span class="Comment"># only in tests</span>
-<span id="L55" class="LineNr"> 55 </span>    trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
-<span id="L56" class="LineNr"> 56 </span><span class="Constant">    <a href='004-programming-environment.mu.html#L56'>&lt;handle-event&gt;</a></span>
-<span id="L57" class="LineNr"> 57 </span>    <span class="Comment"># check for global events that will trigger regardless of which editor has focus</span>
-<span id="L58" class="LineNr"> 58 </span>    <span class="Delimiter">{</span>
-<span id="L59" class="LineNr"> 59 </span>      k:num, is-keycode?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">keycode:variant</span>
-<span id="L60" class="LineNr"> 60 </span>      <span class="muControl">break-unless</span> is-keycode?
-<span id="L61" class="LineNr"> 61 </span><span class="Constant">      <a href='004-programming-environment.mu.html#L61'>&lt;global-keypress&gt;</a></span>
-<span id="L62" class="LineNr"> 62 </span>    <span class="Delimiter">}</span>
-<span id="L63" class="LineNr"> 63 </span>    <span class="Delimiter">{</span>
-<span id="L64" class="LineNr"> 64 </span>      c:char, is-unicode?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">text:variant</span>
-<span id="L65" class="LineNr"> 65 </span>      <span class="muControl">break-unless</span> is-unicode?
-<span id="L66" class="LineNr"> 66 </span><span class="Constant">      <a href='004-programming-environment.mu.html#L66'>&lt;global-type&gt;</a></span>
-<span id="L67" class="LineNr"> 67 </span>    <span class="Delimiter">}</span>
-<span id="L68" class="LineNr"> 68 </span>    <span class="Comment"># 'touch' event - send to both sides, see what picks it up</span>
-<span id="L69" class="LineNr"> 69 </span>    <span class="Delimiter">{</span>
-<span id="L70" class="LineNr"> 70 </span>      t:<a href='../084console.mu.html#L12'>touch-event</a>, is-touch?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">touch:variant</span>
-<span id="L71" class="LineNr"> 71 </span>      <span class="muControl">break-unless</span> is-touch?
-<span id="L72" class="LineNr"> 72 </span>      <span class="Comment"># ignore all but 'left-click' events for now</span>
-<span id="L73" class="LineNr"> 73 </span>      <span class="Comment"># todo: test this</span>
-<span id="L74" class="LineNr"> 74 </span>      touch-type:num <span class="Special">&lt;-</span> get t, <span class="Constant">type:offset</span>
-<span id="L75" class="LineNr"> 75 </span>      is-left-click?:bool <span class="Special">&lt;-</span> equal touch-type, <span class="Constant">65513/mouse-left</span>
-<span id="L76" class="LineNr"> 76 </span>      <span class="muControl">loop-unless</span> is-left-click?, <span class="Constant">+next-event</span>
-<span id="L77" class="LineNr"> 77 </span>      click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
-<span id="L78" class="LineNr"> 78 </span>      click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
-<span id="L79" class="LineNr"> 79 </span>      <span class="Comment"># later exceptions for non-editor touches will go here</span>
-<span id="L80" class="LineNr"> 80 </span><span class="Constant">      <a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span>
-<span id="L81" class="LineNr"> 81 </span>      <span class="Comment"># send to both editors</span>
-<span id="L82" class="LineNr"> 82 </span>      _ <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L48'>move-cursor-in-editor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, t
-<span id="L83" class="LineNr"> 83 </span>      sandbox-in-focus?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L48'>move-cursor-in-editor</a> <a href='../081print.mu.html#L4'>screen</a>, current-sandbox, t
-<span id="L84" class="LineNr"> 84 </span>      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox-in-focus?:offset</span>, sandbox-in-focus?
-<span id="L85" class="LineNr"> 85 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L86" class="LineNr"> 86 </span>      <span class="muControl">loop</span> <span class="Constant">+next-event</span>
-<span id="L87" class="LineNr"> 87 </span>    <span class="Delimiter">}</span>
-<span id="L88" class="LineNr"> 88 </span>    <span class="Comment"># 'resize' event - redraw editor</span>
-<span id="L89" class="LineNr"> 89 </span>    <span class="Comment"># todo: test this after supporting resize in assume-console</span>
-<span id="L90" class="LineNr"> 90 </span>    <span class="Delimiter">{</span>
-<span id="L91" class="LineNr"> 91 </span>      r:<a href='../084console.mu.html#L18'>resize-event</a>, is-resize?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant"><a href='004-programming-environment.mu.html#L175'>resize</a>:variant</span>
-<span id="L92" class="LineNr"> 92 </span>      <span class="muControl">break-unless</span> is-resize?
-<span id="L93" class="LineNr"> 93 </span>      <span class="Comment"># if more events, we're still resizing; wait until we stop</span>
-<span id="L94" class="LineNr"> 94 </span>      more-events?:bool <span class="Special">&lt;-</span> <a href='../084console.mu.html#L100'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
-<span id="L95" class="LineNr"> 95 </span>      <span class="Delimiter">{</span>
-<span id="L96" class="LineNr"> 96 </span>        <span class="muControl">break-unless</span> more-events?
-<span id="L97" class="LineNr"> 97 </span>        render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>  <span class="Comment"># no rendering now, full rendering on some future event</span>
-<span id="L98" class="LineNr"> 98 </span>      <span class="Delimiter">}</span>
-<span id="L99" class="LineNr"> 99 </span>      <span class="Delimiter">{</span>
-<span id="L100" class="LineNr">100 </span>        <span class="muControl">break-if</span> more-events?
-<span id="L101" class="LineNr">101 </span>        env, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L175'>resize</a> <a href='../081print.mu.html#L4'>screen</a>, env
-<span id="L102" class="LineNr">102 </span>        <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='004-programming-environment.mu.html#L202'>render-without-moving-cursor</a>
-<span id="L103" class="LineNr">103 </span>        render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>  <span class="Comment"># full render done</span>
-<span id="L104" class="LineNr">104 </span>      <span class="Delimiter">}</span>
-<span id="L105" class="LineNr">105 </span>      <span class="muControl">loop</span> <span class="Constant">+next-event</span>
-<span id="L106" class="LineNr">106 </span>    <span class="Delimiter">}</span>
-<span id="L107" class="LineNr">107 </span>    <span class="Comment"># if it's not global and not a touch event, send to appropriate editor</span>
-<span id="L108" class="LineNr">108 </span>    <span class="Delimiter">{</span>
-<span id="L109" class="LineNr">109 </span>      <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L110" class="LineNr">110 </span>      sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
-<span id="L111" class="LineNr">111 </span>      <span class="Delimiter">{</span>
-<span id="L112" class="LineNr">112 </span>        <span class="muControl">break-if</span> sandbox-in-focus?
-<span id="L113" class="LineNr">113 </span>        render?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L164'>handle-keyboard-event</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, e:<a href='../084console.mu.html#L4'>event</a>
-<span id="L114" class="LineNr">114 </span>        <span class="Comment"># refresh screen only if no more events</span>
-<span id="L115" class="LineNr">115 </span>        <span class="Comment"># if there are more events to process, wait for them to clear up, then make sure you render-all afterward.</span>
-<span id="L116" class="LineNr">116 </span>        more-events?:bool <span class="Special">&lt;-</span> <a href='../084console.mu.html#L100'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
-<span id="L117" class="LineNr">117 </span>        <span class="Delimiter">{</span>
-<span id="L118" class="LineNr">118 </span>          <span class="muControl">break-unless</span> more-events?
-<span id="L119" class="LineNr">119 </span>          render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>  <span class="Comment"># no rendering now, full rendering on some future event</span>
-<span id="L120" class="LineNr">120 </span>          <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L121" class="LineNr">121 </span>        <span class="Delimiter">}</span>
-<span id="L122" class="LineNr">122 </span>        <span class="Delimiter">{</span>
-<span id="L123" class="LineNr">123 </span>          <span class="muControl">break-if</span> more-events?
-<span id="L124" class="LineNr">124 </span>          <span class="Delimiter">{</span>
-<span id="L125" class="LineNr">125 </span>            <span class="muControl">break-unless</span> render-all-on-no-more-events?
-<span id="L126" class="LineNr">126 </span>            <span class="Comment"># no more events, and we have to force render</span>
-<span id="L127" class="LineNr">127 </span>            <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L128" class="LineNr">128 </span>            render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
-<span id="L129" class="LineNr">129 </span>            <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L130" class="LineNr">130 </span>          <span class="Delimiter">}</span>
-<span id="L131" class="LineNr">131 </span>          <span class="Comment"># no more events, no force render</span>
-<span id="L132" class="LineNr">132 </span>          <span class="Delimiter">{</span>
-<span id="L133" class="LineNr">133 </span>            <span class="muControl">break-unless</span> render?
-<span id="L134" class="LineNr">134 </span>            <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L477'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L135" class="LineNr">135 </span>            <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L136" class="LineNr">136 </span>          <span class="Delimiter">}</span>
-<span id="L137" class="LineNr">137 </span>        <span class="Delimiter">}</span>
-<span id="L138" class="LineNr">138 </span>      <span class="Delimiter">}</span>
-<span id="L139" class="LineNr">139 </span>      <span class="Delimiter">{</span>
-<span id="L140" class="LineNr">140 </span>        <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L141" class="LineNr">141 </span>        render?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L164'>handle-keyboard-event</a> <a href='../081print.mu.html#L4'>screen</a>, current-sandbox, e:<a href='../084console.mu.html#L4'>event</a>
-<span id="L142" class="LineNr">142 </span>        <span class="Comment"># refresh screen only if no more events</span>
-<span id="L143" class="LineNr">143 </span>        <span class="Comment"># if there are more events to process, wait for them to clear up, then make sure you render-all afterward.</span>
-<span id="L144" class="LineNr">144 </span>        more-events?:bool <span class="Special">&lt;-</span> <a href='../084console.mu.html#L100'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
-<span id="L145" class="LineNr">145 </span>        <span class="Delimiter">{</span>
-<span id="L146" class="LineNr">146 </span>          <span class="muControl">break-unless</span> more-events?
-<span id="L147" class="LineNr">147 </span>          render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>  <span class="Comment"># no rendering now, full rendering on some future event</span>
-<span id="L148" class="LineNr">148 </span>          <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L149" class="LineNr">149 </span>        <span class="Delimiter">}</span>
-<span id="L150" class="LineNr">150 </span>        <span class="Delimiter">{</span>
-<span id="L151" class="LineNr">151 </span>          <span class="muControl">break-if</span> more-events?
-<span id="L152" class="LineNr">152 </span>          <span class="Delimiter">{</span>
-<span id="L153" class="LineNr">153 </span>            <span class="muControl">break-unless</span> render-all-on-no-more-events?
-<span id="L154" class="LineNr">154 </span>            <span class="Comment"># no more events, and we have to force render</span>
-<span id="L155" class="LineNr">155 </span>            <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L156" class="LineNr">156 </span>            render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
-<span id="L157" class="LineNr">157 </span>            <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L158" class="LineNr">158 </span>          <span class="Delimiter">}</span>
-<span id="L159" class="LineNr">159 </span>          <span class="Comment"># no more events, no force render</span>
-<span id="L160" class="LineNr">160 </span>          <span class="Delimiter">{</span>
-<span id="L161" class="LineNr">161 </span>            <span class="muControl">break-unless</span> render?
-<span id="L162" class="LineNr">162 </span>            <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L163" class="LineNr">163 </span>            <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L164" class="LineNr">164 </span>          <span class="Delimiter">}</span>
-<span id="L165" class="LineNr">165 </span>        <span class="Delimiter">}</span>
-<span id="L166" class="LineNr">166 </span>      <span class="Delimiter">}</span>
-<span id="L167" class="LineNr">167 </span><span class="Constant">      +finish-event</span>
-<span id="L168" class="LineNr">168 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L169" class="LineNr">169 </span>      <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L170" class="LineNr">170 </span>    <span class="Delimiter">}</span>
-<span id="L171" class="LineNr">171 </span>    <span class="muControl">loop</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
+<span id="L51" class="LineNr"> 51 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-event</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> e:<a href='../084console.mu.html#L4'>event</a>, found?:bool, quit?:bool, <a href='../084console.mu.html#L23'>console</a> <span class="Special">&lt;-</span> <a href='../084console.mu.html#L35'>read-event</a> <a href='../084console.mu.html#L23'>console</a>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> found?
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> quit?  <span class="Comment"># only in tests</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
+<span id="L56" class="LineNr"> 56 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='004-programming-environment.mu.html#L56'>&lt;handle-event&gt;</a></span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <span class="Comment"># check for global events that will trigger regardless of which editor has focus</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> k:num, is-keycode?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">keycode:variant</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-keycode?
+<span id="L61" class="LineNr"> 61 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> <a href='004-programming-environment.mu.html#L61'>&lt;global-keypress&gt;</a></span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c:char, is-unicode?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">text:variant</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-unicode?
+<span id="L66" class="LineNr"> 66 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> <a href='004-programming-environment.mu.html#L66'>&lt;global-type&gt;</a></span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'touch' event - send to both sides, see what picks it up</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> t:<a href='../084console.mu.html#L12'>touch-event</a>, is-touch?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">touch:variant</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-touch?
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># ignore all but 'left-click' events for now</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># todo: test this</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> touch-type:num <span class="Special">&lt;-</span> get t, <span class="Constant">type:offset</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> is-left-click?:bool <span class="Special">&lt;-</span> equal touch-type, <span class="Constant">65513/mouse-left</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> is-left-click?, <span class="Constant">+next-event</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># later exceptions for non-editor touches will go here</span>
+<span id="L80" class="LineNr"> 80 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> <a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># send to both editors</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> _ <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L48'>move-cursor-in-editor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, t
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> sandbox-in-focus?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L48'>move-cursor-in-editor</a> <a href='../081print.mu.html#L4'>screen</a>, current-sandbox, t
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox-in-focus?:offset</span>, sandbox-in-focus?
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'resize' event - redraw editor</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> <span class="Comment"># todo: test this after supporting resize in assume-console</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> r:<a href='../084console.mu.html#L18'>resize-event</a>, is-resize?:bool <span class="Special">&lt;-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant"><a href='004-programming-environment.mu.html#L175'>resize</a>:variant</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-resize?
+<span id="L93" class="LineNr"> 93 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if more events, we're still resizing; wait until we stop</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> more-events?:bool <span class="Special">&lt;-</span> <a href='../084console.mu.html#L100'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
+<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> more-events?
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>  <span class="Comment"># no rendering now, full rendering on some future event</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> more-events?
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> env, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L175'>resize</a> <a href='../081print.mu.html#L4'>screen</a>, env
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='004-programming-environment.mu.html#L202'>render-without-moving-cursor</a>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>  <span class="Comment"># full render done</span>
+<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> <span class="Comment"># if it's not global and not a touch event, send to appropriate editor</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L164'>handle-keyboard-event</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, e:<a href='../084console.mu.html#L4'>event</a>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># refresh screen only if no more events</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if there are more events to process, wait for them to clear up, then make sure you render-all afterward.</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> more-events?:bool <span class="Special">&lt;-</span> <a href='../084console.mu.html#L100'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> more-events?
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>  <span class="Comment"># no rendering now, full rendering on some future event</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> more-events?
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render-all-on-no-more-events?
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># no more events, and we have to force render</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># no more events, no force render</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render?
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L477'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render?:bool <span class="Special">&lt;-</span> <a href='002-typing.mu.html#L164'>handle-keyboard-event</a> <a href='../081print.mu.html#L4'>screen</a>, current-sandbox, e:<a href='../084console.mu.html#L4'>event</a>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># refresh screen only if no more events</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if there are more events to process, wait for them to clear up, then make sure you render-all afterward.</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> more-events?:bool <span class="Special">&lt;-</span> <a href='../084console.mu.html#L100'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> more-events?
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>  <span class="Comment"># no rendering now, full rendering on some future event</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> more-events?
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render-all-on-no-more-events?
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># no more events, and we have to force render</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-all-on-no-more-events? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># no more events, no force render</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render?
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L167" class="LineNr">167 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> +finish-event</span>
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Delimiter">}</span>
 <span id="L173" class="LineNr">173 </span>]
 <span id="L174" class="LineNr">174 </span>
@@ -284,55 +285,55 @@ if ('onhashchange' in window) {
 <span id="L223" class="LineNr">223 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, top-of-screen
 <span id="L224" class="LineNr">224 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
 <span id="L225" class="LineNr">225 </span>  <span class="Delimiter">{</span>
-<span id="L226" class="LineNr">226 </span><span class="Constant">    +next-character</span>
-<span id="L227" class="LineNr">227 </span>    <span class="muControl">break-unless</span> curr
-<span id="L228" class="LineNr">228 </span>    off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L229" class="LineNr">229 </span>    <span class="muControl">break-if</span> off-screen?
-<span id="L230" class="LineNr">230 </span>    <span class="Comment"># if we find old-before-cursor still on the new resized screen, update</span>
-<span id="L231" class="LineNr">231 </span>    <span class="Comment"># editor.cursor-row and editor.cursor-column based on</span>
-<span id="L232" class="LineNr">232 </span>    <span class="Comment"># old-before-cursor</span>
-<span id="L233" class="LineNr">233 </span>    <span class="Delimiter">{</span>
-<span id="L234" class="LineNr">234 </span>      at-cursor?:bool <span class="Special">&lt;-</span> equal old-before-cursor, <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L235" class="LineNr">235 </span>      <span class="muControl">break-unless</span> at-cursor?
-<span id="L236" class="LineNr">236 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, row
-<span id="L237" class="LineNr">237 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, column
-<span id="L238" class="LineNr">238 </span>      *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, old-before-cursor
-<span id="L239" class="LineNr">239 </span>    <span class="Delimiter">}</span>
-<span id="L240" class="LineNr">240 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L241" class="LineNr">241 </span><span class="Constant">    &lt;character-c-received&gt;</span>
-<span id="L242" class="LineNr">242 </span>    <span class="Delimiter">{</span>
-<span id="L243" class="LineNr">243 </span>      <span class="Comment"># newline? move to left rather than 0</span>
-<span id="L244" class="LineNr">244 </span>      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L245" class="LineNr">245 </span>      <span class="muControl">break-unless</span> newline?
-<span id="L246" class="LineNr">246 </span>      <span class="Comment"># clear rest of line in this window</span>
-<span id="L247" class="LineNr">247 </span>      <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
-<span id="L248" class="LineNr">248 </span>      <span class="Comment"># skip to next line</span>
-<span id="L249" class="LineNr">249 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L250" class="LineNr">250 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L251" class="LineNr">251 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L252" class="LineNr">252 </span>      curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L253" class="LineNr">253 </span>      <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L254" class="LineNr">254 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L255" class="LineNr">255 </span>    <span class="Delimiter">}</span>
-<span id="L256" class="LineNr">256 </span>    <span class="Delimiter">{</span>
-<span id="L257" class="LineNr">257 </span>      <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
-<span id="L258" class="LineNr">258 </span>      <span class="Comment"># room for clicking on the cursor after it.</span>
-<span id="L259" class="LineNr">259 </span>      at-right?:bool <span class="Special">&lt;-</span> equal column, right
-<span id="L260" class="LineNr">260 </span>      <span class="muControl">break-unless</span> at-right?
-<span id="L261" class="LineNr">261 </span>      <span class="Comment"># print wrap icon</span>
-<span id="L262" class="LineNr">262 </span>      wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
-<span id="L263" class="LineNr">263 </span>      print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
-<span id="L264" class="LineNr">264 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L265" class="LineNr">265 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L266" class="LineNr">266 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L267" class="LineNr">267 </span>      <span class="Comment"># don't increment curr</span>
-<span id="L268" class="LineNr">268 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L269" class="LineNr">269 </span>    <span class="Delimiter">}</span>
-<span id="L270" class="LineNr">270 </span>    print <a href='../081print.mu.html#L4'>screen</a>, c, color
-<span id="L271" class="LineNr">271 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L272" class="LineNr">272 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
-<span id="L273" class="LineNr">273 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L274" class="LineNr">274 </span>    <span class="muControl">loop</span>
+<span id="L226" class="LineNr">226 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> off-screen?
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Comment"># if we find old-before-cursor still on the new resized screen, update</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Comment"># editor.cursor-row and editor.cursor-column based on</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <span class="Comment"># old-before-cursor</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor?:bool <span class="Special">&lt;-</span> equal old-before-cursor, <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor?
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, row
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, column
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, old-before-cursor
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L241" class="LineNr">241 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;character-c-received&gt;</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># skip to next line</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># room for clicking on the cursor after it.</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
+<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># don't increment curr</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L275" class="LineNr">275 </span>  <span class="Delimiter">}</span>
 <span id="L276" class="LineNr">276 </span>  <span class="Comment"># save first character off-screen</span>
 <span id="L277" class="LineNr">277 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom-of-screen:offset</span>, curr
@@ -346,27 +347,27 @@ if ('onhashchange' in window) {
 <span id="L285" class="LineNr">285 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
 <span id="L286" class="LineNr">286 </span>  <span class="Comment"># initialize both halves of screen</span>
 <span id="L287" class="LineNr">287 </span>  assume-resources [
-<span id="L288" class="LineNr">288 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L289" class="LineNr">289 </span><span class="Constant">      |abc|</span>
-<span id="L290" class="LineNr">290 </span>    ]
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L289" class="LineNr">289 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> ]
 <span id="L291" class="LineNr">291 </span>  ]
 <span id="L292" class="LineNr">292 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[def]</span>  <span class="Comment"># contents of sandbox editor</span>
 <span id="L293" class="LineNr">293 </span>  <span class="Comment"># focus on both sides</span>
 <span id="L294" class="LineNr">294 </span>  assume-console [
-<span id="L295" class="LineNr">295 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L296" class="LineNr">296 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
 <span id="L297" class="LineNr">297 </span>  ]
 <span id="L298" class="LineNr">298 </span>  <span class="Comment"># check cursor column in each</span>
 <span id="L299" class="LineNr">299 </span>  run [
-<span id="L300" class="LineNr">300 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L301" class="LineNr">301 </span>    recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L302" class="LineNr">302 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
-<span id="L303" class="LineNr">303 </span>    sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L304" class="LineNr">304 </span>    7:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">cursor-column:offset</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span> 7:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">cursor-column:offset</span>
 <span id="L305" class="LineNr">305 </span>  ]
 <span id="L306" class="LineNr">306 </span>  memory-should-contain [
-<span id="L307" class="LineNr">307 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L308" class="LineNr">308 </span>   <span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 17</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 17</span>
 <span id="L309" class="LineNr">309 </span>  ]
 <span id="L310" class="LineNr">310 </span>]
 <span id="L311" class="LineNr">311 </span>
@@ -376,48 +377,48 @@ if ('onhashchange' in window) {
 <span id="L315" class="LineNr">315 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
 <span id="L316" class="LineNr">316 </span>  <span class="Comment"># initialize both halves of screen</span>
 <span id="L317" class="LineNr">317 </span>  assume-resources [
-<span id="L318" class="LineNr">318 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L319" class="LineNr">319 </span><span class="Constant">      |abc|</span>
-<span id="L320" class="LineNr">320 </span>    ]
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L319" class="LineNr">319 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span> ]
 <span id="L321" class="LineNr">321 </span>  ]
 <span id="L322" class="LineNr">322 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[def]</span>  <span class="Comment"># contents of sandbox</span>
 <span id="L323" class="LineNr">323 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L324" class="LineNr">324 </span>  <span class="Comment"># type one letter in each of them</span>
 <span id="L325" class="LineNr">325 </span>  assume-console [
-<span id="L326" class="LineNr">326 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L327" class="LineNr">327 </span>    type <span class="Constant">[0]</span>
-<span id="L328" class="LineNr">328 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
-<span id="L329" class="LineNr">329 </span>    type <span class="Constant">[1]</span>
+<span id="L326" class="LineNr">326 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L330" class="LineNr">330 </span>  ]
 <span id="L331" class="LineNr">331 </span>  run [
-<span id="L332" class="LineNr">332 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L333" class="LineNr">333 </span>    recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L334" class="LineNr">334 </span>    5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
-<span id="L335" class="LineNr">335 </span>    sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L336" class="LineNr">336 </span>    7:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">cursor-column:offset</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span> recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> 5:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span> sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span> 7:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">cursor-column:offset</span>
 <span id="L337" class="LineNr">337 </span>  ]
 <span id="L338" class="LineNr">338 </span>  screen-should-contain [
-<span id="L339" class="LineNr">339 </span>   <span class="Constant"> .           run (F4)           .  # this line has a different background, but we don't test that yet</span>
-<span id="L340" class="LineNr">340 </span>   <span class="Constant"> .a0bc           ╎d1ef          .</span>
-<span id="L341" class="LineNr">341 </span>   <span class="Constant"> .               ╎──────────────.</span>
-<span id="L342" class="LineNr">342 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
-<span id="L343" class="LineNr">343 </span>   <span class="Constant"> .               ╎              .</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .  # this line has a different background, but we don't test that yet</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc           ╎d1ef          .</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
 <span id="L344" class="LineNr">344 </span>  ]
 <span id="L345" class="LineNr">345 </span>  memory-should-contain [
-<span id="L346" class="LineNr">346 </span>   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column of recipe editor</span>
-<span id="L347" class="LineNr">347 </span>   <span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 18</span>  <span class="Comment"># cursor column of sandbox editor</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column of recipe editor</span>
+<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 18</span>  <span class="Comment"># cursor column of sandbox editor</span>
 <span id="L348" class="LineNr">348 </span>  ]
 <span id="L349" class="LineNr">349 </span>  <span class="Comment"># show the cursor at the right window</span>
 <span id="L350" class="LineNr">350 </span>  run [
-<span id="L351" class="LineNr">351 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L352" class="LineNr">352 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L352" class="LineNr">352 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L353" class="LineNr">353 </span>  ]
 <span id="L354" class="LineNr">354 </span>  screen-should-contain [
-<span id="L355" class="LineNr">355 </span>   <span class="Constant"> .           run (F4)           .</span>
-<span id="L356" class="LineNr">356 </span>   <span class="Constant"> .a0bc           ╎d1␣f          .</span>
-<span id="L357" class="LineNr">357 </span>   <span class="Constant"> .               ╎──────────────.</span>
-<span id="L358" class="LineNr">358 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
-<span id="L359" class="LineNr">359 </span>   <span class="Constant"> .               ╎              .</span>
+<span id="L355" class="LineNr">355 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L356" class="LineNr">356 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc           ╎d1␣f          .</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
 <span id="L360" class="LineNr">360 </span>  ]
 <span id="L361" class="LineNr">361 </span>]
 <span id="L362" class="LineNr">362 </span>
@@ -426,43 +427,43 @@ if ('onhashchange' in window) {
 <span id="L365" class="LineNr">365 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
 <span id="L366" class="LineNr">366 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
 <span id="L367" class="LineNr">367 </span>  assume-resources [
-<span id="L368" class="LineNr">368 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L369" class="LineNr">369 </span><span class="Constant">      |abc|</span>
-<span id="L370" class="LineNr">370 </span>    ]
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L369" class="LineNr">369 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> ]
 <span id="L371" class="LineNr">371 </span>  ]
 <span id="L372" class="LineNr">372 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[def]</span>
 <span id="L373" class="LineNr">373 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L374" class="LineNr">374 </span>  <span class="Comment"># initialize programming environment and highlight cursor</span>
 <span id="L375" class="LineNr">375 </span>  assume-console <span class="Constant">[]</span>
 <span id="L376" class="LineNr">376 </span>  run [
-<span id="L377" class="LineNr">377 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L378" class="LineNr">378 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L379" class="LineNr">379 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L378" class="LineNr">378 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L379" class="LineNr">379 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L380" class="LineNr">380 </span>  ]
 <span id="L381" class="LineNr">381 </span>  <span class="Comment"># is cursor at the right place?</span>
 <span id="L382" class="LineNr">382 </span>  screen-should-contain [
-<span id="L383" class="LineNr">383 </span>   <span class="Constant"> .           run (F4)           .</span>
-<span id="L384" class="LineNr">384 </span>   <span class="Constant"> .␣bc            ╎def           .</span>
-<span id="L385" class="LineNr">385 </span>   <span class="Constant"> .               ╎──────────────.</span>
-<span id="L386" class="LineNr">386 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
-<span id="L387" class="LineNr">387 </span>   <span class="Constant"> .               ╎              .</span>
+<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣bc            ╎def           .</span>
+<span id="L385" class="LineNr">385 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
+<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
 <span id="L388" class="LineNr">388 </span>  ]
 <span id="L389" class="LineNr">389 </span>  <span class="Comment"># now try typing a letter</span>
 <span id="L390" class="LineNr">390 </span>  assume-console [
-<span id="L391" class="LineNr">391 </span>    type <span class="Constant">[z]</span>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> type <span class="Constant">[z]</span>
 <span id="L392" class="LineNr">392 </span>  ]
 <span id="L393" class="LineNr">393 </span>  run [
-<span id="L394" class="LineNr">394 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L395" class="LineNr">395 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L396" class="LineNr">396 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L397" class="LineNr">397 </span>  ]
 <span id="L398" class="LineNr">398 </span>  <span class="Comment"># cursor should still be right</span>
 <span id="L399" class="LineNr">399 </span>  screen-should-contain [
-<span id="L400" class="LineNr">400 </span>   <span class="Constant"> .           run (F4)           .</span>
-<span id="L401" class="LineNr">401 </span>   <span class="Constant"> .z␣bc           ╎def           .</span>
-<span id="L402" class="LineNr">402 </span>   <span class="Constant"> .               ╎──────────────.</span>
-<span id="L403" class="LineNr">403 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
-<span id="L404" class="LineNr">404 </span>   <span class="Constant"> .               ╎              .</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span><span class="Constant"> .z␣bc           ╎def           .</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
+<span id="L404" class="LineNr">404 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
 <span id="L405" class="LineNr">405 </span>  ]
 <span id="L406" class="LineNr">406 </span>]
 <span id="L407" class="LineNr">407 </span>
@@ -478,28 +479,28 @@ if ('onhashchange' in window) {
 <span id="L417" class="LineNr">417 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, test-sandbox-editor-contents
 <span id="L418" class="LineNr">418 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L419" class="LineNr">419 </span>  screen-should-contain [
-<span id="L420" class="LineNr">420 </span>   <span class="Constant"> .           run (F4)           .</span>
-<span id="L421" class="LineNr">421 </span>   <span class="Constant"> .               ╎abc           .</span>
-<span id="L422" class="LineNr">422 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎def           .</span>
-<span id="L423" class="LineNr">423 </span>   <span class="Constant"> .               ╎──────────────.</span>
-<span id="L424" class="LineNr">424 </span>   <span class="Constant"> .               ╎              .</span>
+<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎abc           .</span>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎def           .</span>
+<span id="L423" class="LineNr">423 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L424" class="LineNr">424 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
 <span id="L425" class="LineNr">425 </span>  ]
 <span id="L426" class="LineNr">426 </span>  <span class="Comment"># position cursor at start of second line and hit backspace</span>
 <span id="L427" class="LineNr">427 </span>  assume-console [
-<span id="L428" class="LineNr">428 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 16</span>
-<span id="L429" class="LineNr">429 </span>    press backspace
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 16</span>
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> press backspace
 <span id="L430" class="LineNr">430 </span>  ]
 <span id="L431" class="LineNr">431 </span>  run [
-<span id="L432" class="LineNr">432 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L433" class="LineNr">433 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L434" class="LineNr">434 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L435" class="LineNr">435 </span>  ]
 <span id="L436" class="LineNr">436 </span>  <span class="Comment"># cursor moves to end of old line</span>
 <span id="L437" class="LineNr">437 </span>  screen-should-contain [
-<span id="L438" class="LineNr">438 </span>   <span class="Constant"> .           run (F4)           .</span>
-<span id="L439" class="LineNr">439 </span>   <span class="Constant"> .               ╎abc␣ef        .</span>
-<span id="L440" class="LineNr">440 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎──────────────.</span>
-<span id="L441" class="LineNr">441 </span>   <span class="Constant"> .               ╎              .</span>
+<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎abc␣ef        .</span>
+<span id="L440" class="LineNr">440 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎──────────────.</span>
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
 <span id="L442" class="LineNr">442 </span>  ]
 <span id="L443" class="LineNr">443 </span>]
 <span id="L444" class="LineNr">444 </span>
@@ -574,14 +575,14 @@ if ('onhashchange' in window) {
 <span id="L513" class="LineNr">513 </span>  <span class="Constant">load-ingredients</span>
 <span id="L514" class="LineNr">514 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L514'>&lt;update-cursor-special-cases&gt;</a></span>
 <span id="L515" class="LineNr">515 </span>  <span class="Delimiter">{</span>
-<span id="L516" class="LineNr">516 </span>    <span class="muControl">break-if</span> sandbox-in-focus?
-<span id="L517" class="LineNr">517 </span>    cursor-row:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-row:offset</span>
-<span id="L518" class="LineNr">518 </span>    cursor-column:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
+<span id="L516" class="LineNr">516 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
+<span id="L517" class="LineNr">517 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-row:offset</span>
+<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
 <span id="L519" class="LineNr">519 </span>  <span class="Delimiter">}</span>
 <span id="L520" class="LineNr">520 </span>  <span class="Delimiter">{</span>
-<span id="L521" class="LineNr">521 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L522" class="LineNr">522 </span>    cursor-row:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">cursor-row:offset</span>
-<span id="L523" class="LineNr">523 </span>    cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">cursor-column:offset</span>
+<span id="L521" class="LineNr">521 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">cursor-row:offset</span>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">cursor-column:offset</span>
 <span id="L524" class="LineNr">524 </span>  <span class="Delimiter">}</span>
 <span id="L525" class="LineNr">525 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
 <span id="L526" class="LineNr">526 </span>]
@@ -598,53 +599,53 @@ if ('onhashchange' in window) {
 <span id="L537" class="LineNr">537 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L538" class="LineNr">538 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L539" class="LineNr">539 </span>  <span class="Delimiter">{</span>
-<span id="L540" class="LineNr">540 </span><span class="Constant">    +next-character</span>
-<span id="L541" class="LineNr">541 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L542" class="LineNr">542 </span>    <span class="muControl">break-if</span> done?
-<span id="L543" class="LineNr">543 </span>    done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L544" class="LineNr">544 </span>    <span class="muControl">break-if</span> done?
-<span id="L545" class="LineNr">545 </span>    c:char <span class="Special">&lt;-</span> index *s, i
-<span id="L546" class="LineNr">546 </span>    <span class="Constant">&lt;character-c-received&gt;</span>  <span class="Comment"># only line different from render</span>
-<span id="L547" class="LineNr">547 </span>    <span class="Delimiter">{</span>
-<span id="L548" class="LineNr">548 </span>      <span class="Comment"># at right? wrap.</span>
-<span id="L549" class="LineNr">549 </span>      at-right?:bool <span class="Special">&lt;-</span> equal column, right
-<span id="L550" class="LineNr">550 </span>      <span class="muControl">break-unless</span> at-right?
-<span id="L551" class="LineNr">551 </span>      <span class="Comment"># print wrap icon</span>
-<span id="L552" class="LineNr">552 </span>      wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
-<span id="L553" class="LineNr">553 </span>      print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
-<span id="L554" class="LineNr">554 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L555" class="LineNr">555 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L556" class="LineNr">556 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L557" class="LineNr">557 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>  <span class="Comment"># retry i</span>
-<span id="L558" class="LineNr">558 </span>    <span class="Delimiter">}</span>
-<span id="L559" class="LineNr">559 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L560" class="LineNr">560 </span>    <span class="Delimiter">{</span>
-<span id="L561" class="LineNr">561 </span>      <span class="Comment"># newline? move to left rather than 0</span>
-<span id="L562" class="LineNr">562 </span>      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L563" class="LineNr">563 </span>      <span class="muControl">break-unless</span> newline?
-<span id="L564" class="LineNr">564 </span>      <span class="Comment"># clear rest of line in this window</span>
-<span id="L565" class="LineNr">565 </span>      <span class="Delimiter">{</span>
-<span id="L566" class="LineNr">566 </span>        done?:bool <span class="Special">&lt;-</span> greater-than column, right
-<span id="L567" class="LineNr">567 </span>        <span class="muControl">break-if</span> done?
-<span id="L568" class="LineNr">568 </span>        space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
-<span id="L569" class="LineNr">569 </span>        print <a href='../081print.mu.html#L4'>screen</a>, space
-<span id="L570" class="LineNr">570 </span>        column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L571" class="LineNr">571 </span>        <span class="muControl">loop</span>
-<span id="L572" class="LineNr">572 </span>      <span class="Delimiter">}</span>
-<span id="L573" class="LineNr">573 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L574" class="LineNr">574 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L575" class="LineNr">575 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L576" class="LineNr">576 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L577" class="LineNr">577 </span>    <span class="Delimiter">}</span>
-<span id="L578" class="LineNr">578 </span>    print <a href='../081print.mu.html#L4'>screen</a>, c, color
-<span id="L579" class="LineNr">579 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L580" class="LineNr">580 </span>    <span class="muControl">loop</span>
+<span id="L540" class="LineNr">540 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L541" class="LineNr">541 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L543" class="LineNr">543 </span>  <span class="Conceal">¦</span> done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L544" class="LineNr">544 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L545" class="LineNr">545 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *s, i
+<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span> <span class="Constant">&lt;character-c-received&gt;</span>  <span class="Comment"># only line different from render</span>
+<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L548" class="LineNr">548 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># at right? wrap.</span>
+<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
+<span id="L550" class="LineNr">550 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
+<span id="L551" class="LineNr">551 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
+<span id="L552" class="LineNr">552 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
+<span id="L553" class="LineNr">553 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
+<span id="L554" class="LineNr">554 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L555" class="LineNr">555 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L556" class="LineNr">556 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L557" class="LineNr">557 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>  <span class="Comment"># retry i</span>
+<span id="L558" class="LineNr">558 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L559" class="LineNr">559 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L560" class="LineNr">560 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L561" class="LineNr">561 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
+<span id="L562" class="LineNr">562 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L563" class="LineNr">563 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L564" class="LineNr">564 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
+<span id="L565" class="LineNr">565 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L566" class="LineNr">566 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-than column, right
+<span id="L567" class="LineNr">567 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L568" class="LineNr">568 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
+<span id="L569" class="LineNr">569 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, space
+<span id="L570" class="LineNr">570 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L571" class="LineNr">571 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L572" class="LineNr">572 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L573" class="LineNr">573 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L574" class="LineNr">574 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L575" class="LineNr">575 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L576" class="LineNr">576 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L577" class="LineNr">577 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L578" class="LineNr">578 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
+<span id="L579" class="LineNr">579 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L580" class="LineNr">580 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L581" class="LineNr">581 </span>  <span class="Delimiter">}</span>
 <span id="L582" class="LineNr">582 </span>  was-at-left?:bool <span class="Special">&lt;-</span> equal column, left
 <span id="L583" class="LineNr">583 </span>  <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
 <span id="L584" class="LineNr">584 </span>  <span class="Delimiter">{</span>
-<span id="L585" class="LineNr">585 </span>    <span class="muControl">break-if</span> was-at-left?
-<span id="L586" class="LineNr">586 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L585" class="LineNr">585 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> was-at-left?
+<span id="L586" class="LineNr">586 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
 <span id="L587" class="LineNr">587 </span>  <span class="Delimiter">}</span>
 <span id="L588" class="LineNr">588 </span>  <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
 <span id="L589" class="LineNr">589 </span>]
@@ -653,11 +654,11 @@ if ('onhashchange' in window) {
 <span id="L592" class="LineNr">592 </span>
 <span id="L593" class="LineNr">593 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L66'>&lt;global-type&gt;</a></span> [
 <span id="L594" class="LineNr">594 </span>  <span class="Delimiter">{</span>
-<span id="L595" class="LineNr">595 </span>    redraw-screen?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">12/ctrl-l</span>
-<span id="L596" class="LineNr">596 </span>    <span class="muControl">break-unless</span> redraw-screen?
-<span id="L597" class="LineNr">597 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L598" class="LineNr">598 </span>    <a href='../081print.mu.html#L53'>sync-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L599" class="LineNr">599 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L595" class="LineNr">595 </span>  <span class="Conceal">¦</span> redraw-screen?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">12/ctrl-l</span>
+<span id="L596" class="LineNr">596 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> redraw-screen?
+<span id="L597" class="LineNr">597 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L598" class="LineNr">598 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L53'>sync-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L599" class="LineNr">599 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L600" class="LineNr">600 </span>  <span class="Delimiter">}</span>
 <span id="L601" class="LineNr">601 </span>]
 <span id="L602" class="LineNr">602 </span>
@@ -666,13 +667,13 @@ if ('onhashchange' in window) {
 <span id="L605" class="LineNr">605 </span>
 <span id="L606" class="LineNr">606 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L66'>&lt;global-type&gt;</a></span> [
 <span id="L607" class="LineNr">607 </span>  <span class="Delimiter">{</span>
-<span id="L608" class="LineNr">608 </span>    switch-side?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">14/ctrl-n</span>
-<span id="L609" class="LineNr">609 </span>    <span class="muControl">break-unless</span> switch-side?
-<span id="L610" class="LineNr">610 </span>    sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
-<span id="L611" class="LineNr">611 </span>    sandbox-in-focus? <span class="Special">&lt;-</span> not sandbox-in-focus?
-<span id="L612" class="LineNr">612 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox-in-focus?:offset</span>, sandbox-in-focus?
-<span id="L613" class="LineNr">613 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L614" class="LineNr">614 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L608" class="LineNr">608 </span>  <span class="Conceal">¦</span> switch-side?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">14/ctrl-n</span>
+<span id="L609" class="LineNr">609 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> switch-side?
+<span id="L610" class="LineNr">610 </span>  <span class="Conceal">¦</span> sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
+<span id="L611" class="LineNr">611 </span>  <span class="Conceal">¦</span> sandbox-in-focus? <span class="Special">&lt;-</span> not sandbox-in-focus?
+<span id="L612" class="LineNr">612 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox-in-focus?:offset</span>, sandbox-in-focus?
+<span id="L613" class="LineNr">613 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L614" class="LineNr">614 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L615" class="LineNr">615 </span>  <span class="Delimiter">}</span>
 <span id="L616" class="LineNr">616 </span>]
 <span id="L617" class="LineNr">617 </span>
@@ -683,22 +684,22 @@ if ('onhashchange' in window) {
 <span id="L622" class="LineNr">622 </span>  <span class="Constant">load-ingredients</span>
 <span id="L623" class="LineNr">623 </span>  style:char, style-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L624" class="LineNr">624 </span>  <span class="Delimiter">{</span>
-<span id="L625" class="LineNr">625 </span>    <span class="muControl">break-if</span> style-found?
-<span id="L626" class="LineNr">626 </span>    style <span class="Special">&lt;-</span> copy <span class="Constant">9474/vertical</span>
+<span id="L625" class="LineNr">625 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> style-found?
+<span id="L626" class="LineNr">626 </span>  <span class="Conceal">¦</span> style <span class="Special">&lt;-</span> copy <span class="Constant">9474/vertical</span>
 <span id="L627" class="LineNr">627 </span>  <span class="Delimiter">}</span>
 <span id="L628" class="LineNr">628 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
 <span id="L629" class="LineNr">629 </span>  <span class="Delimiter">{</span>
-<span id="L630" class="LineNr">630 </span>    <span class="Comment"># default color to white</span>
-<span id="L631" class="LineNr">631 </span>    <span class="muControl">break-if</span> color-found?
-<span id="L632" class="LineNr">632 </span>    color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
+<span id="L630" class="LineNr">630 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L631" class="LineNr">631 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L632" class="LineNr">632 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
 <span id="L633" class="LineNr">633 </span>  <span class="Delimiter">}</span>
 <span id="L634" class="LineNr">634 </span>  <span class="Delimiter">{</span>
-<span id="L635" class="LineNr">635 </span>    continue?:bool <span class="Special">&lt;-</span> lesser-than y, bottom
-<span id="L636" class="LineNr">636 </span>    <span class="muControl">break-unless</span> continue?
-<span id="L637" class="LineNr">637 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, y, col
-<span id="L638" class="LineNr">638 </span>    print <a href='../081print.mu.html#L4'>screen</a>, style, color
-<span id="L639" class="LineNr">639 </span>    y <span class="Special">&lt;-</span> add y,<span class="Constant"> 1</span>
-<span id="L640" class="LineNr">640 </span>    <span class="muControl">loop</span>
+<span id="L635" class="LineNr">635 </span>  <span class="Conceal">¦</span> continue?:bool <span class="Special">&lt;-</span> lesser-than y, bottom
+<span id="L636" class="LineNr">636 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> continue?
+<span id="L637" class="LineNr">637 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, y, col
+<span id="L638" class="LineNr">638 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, style, color
+<span id="L639" class="LineNr">639 </span>  <span class="Conceal">¦</span> y <span class="Special">&lt;-</span> add y,<span class="Constant"> 1</span>
+<span id="L640" class="LineNr">640 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L641" class="LineNr">641 </span>  <span class="Delimiter">}</span>
 <span id="L642" class="LineNr">642 </span>]
 </pre>
diff --git a/html/edit/005-sandbox.mu.html b/html/edit/005-sandbox.mu.html
index e25d4a82..1e77e54e 100644
--- a/html/edit/005-sandbox.mu.html
+++ b/html/edit/005-sandbox.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -110,94 +111,94 @@ if ('onhashchange' in window) {
 <span id="L49" class="LineNr">  49 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[divide-with-remainder 11, 3]</span>
 <span id="L50" class="LineNr">  50 </span>  <span class="Comment"># run the code in the editors</span>
 <span id="L51" class="LineNr">  51 </span>  assume-console [
-<span id="L52" class="LineNr">  52 </span>    press F4
+<span id="L52" class="LineNr">  52 </span>  <span class="Conceal">¦</span> press F4
 <span id="L53" class="LineNr">  53 </span>  ]
 <span id="L54" class="LineNr">  54 </span>  run [
-<span id="L55" class="LineNr">  55 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L55" class="LineNr">  55 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L56" class="LineNr">  56 </span>  ]
 <span id="L57" class="LineNr">  57 </span>  <span class="Comment"># check that screen prints the results</span>
 <span id="L58" class="LineNr">  58 </span>  screen-should-contain [
-<span id="L59" class="LineNr">  59 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L60" class="LineNr">  60 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L61" class="LineNr">  61 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L62" class="LineNr">  62 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L63" class="LineNr">  63 </span>   <span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
-<span id="L64" class="LineNr">  64 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
-<span id="L65" class="LineNr">  65 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L66" class="LineNr">  66 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L67" class="LineNr">  67 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L59" class="LineNr">  59 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L60" class="LineNr">  60 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L61" class="LineNr">  61 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L62" class="LineNr">  62 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L63" class="LineNr">  63 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
+<span id="L64" class="LineNr">  64 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎3                                                .</span>
+<span id="L65" class="LineNr">  65 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L66" class="LineNr">  66 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L67" class="LineNr">  67 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L68" class="LineNr">  68 </span>  ]
 <span id="L69" class="LineNr">  69 </span>  screen-should-contain-in-color <span class="Constant">7/white</span>, [
-<span id="L70" class="LineNr">  70 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L71" class="LineNr">  71 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L72" class="LineNr">  72 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L73" class="LineNr">  73 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L74" class="LineNr">  74 </span>   <span class="Constant"> .                                                   divide-with-remainder 11, 3                      .</span>
-<span id="L75" class="LineNr">  75 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L76" class="LineNr">  76 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L77" class="LineNr">  77 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L78" class="LineNr">  78 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L70" class="LineNr">  70 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L71" class="LineNr">  71 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L72" class="LineNr">  72 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L73" class="LineNr">  73 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L74" class="LineNr">  74 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   divide-with-remainder 11, 3                      .</span>
+<span id="L75" class="LineNr">  75 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L76" class="LineNr">  76 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L77" class="LineNr">  77 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L78" class="LineNr">  78 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L79" class="LineNr">  79 </span>  ]
 <span id="L80" class="LineNr">  80 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
-<span id="L81" class="LineNr">  81 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L82" class="LineNr">  82 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L83" class="LineNr">  83 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L84" class="LineNr">  84 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L85" class="LineNr">  85 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L86" class="LineNr">  86 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
-<span id="L87" class="LineNr">  87 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L88" class="LineNr">  88 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L89" class="LineNr">  89 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L81" class="LineNr">  81 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L82" class="LineNr">  82 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L83" class="LineNr">  83 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L84" class="LineNr">  84 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L85" class="LineNr">  85 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L86" class="LineNr">  86 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎3                                                .</span>
+<span id="L87" class="LineNr">  87 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L88" class="LineNr">  88 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L89" class="LineNr">  89 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L90" class="LineNr">  90 </span>  ]
 <span id="L91" class="LineNr">  91 </span>  <span class="Comment"># sandbox menu in reverse video</span>
 <span id="L92" class="LineNr">  92 </span>  screen-should-contain-in-color <span class="Constant">232/black</span>, [
-<span id="L93" class="LineNr">  93 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L94" class="LineNr">  94 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L95" class="LineNr">  95 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L96" class="LineNr">  96 </span>   <span class="Constant"> .                                                   0   edit          copy            delete         .</span>
+<span id="L93" class="LineNr">  93 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L94" class="LineNr">  94 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L95" class="LineNr">  95 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L96" class="LineNr">  96 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   0   edit          copy            delete         .</span>
 <span id="L97" class="LineNr">  97 </span>  ]
 <span id="L98" class="LineNr">  98 </span>  <span class="Comment"># run another command</span>
 <span id="L99" class="LineNr">  99 </span>  assume-console [
-<span id="L100" class="LineNr"> 100 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 80</span>
-<span id="L101" class="LineNr"> 101 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L102" class="LineNr"> 102 </span>    press F4
+<span id="L100" class="LineNr"> 100 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 80</span>
+<span id="L101" class="LineNr"> 101 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L102" class="LineNr"> 102 </span>  <span class="Conceal">¦</span> press F4
 <span id="L103" class="LineNr"> 103 </span>  ]
 <span id="L104" class="LineNr"> 104 </span>  run [
-<span id="L105" class="LineNr"> 105 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L105" class="LineNr"> 105 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L106" class="LineNr"> 106 </span>  ]
 <span id="L107" class="LineNr"> 107 </span>  <span class="Comment"># check that screen prints both sandboxes</span>
 <span id="L108" class="LineNr"> 108 </span>  screen-should-contain [
-<span id="L109" class="LineNr"> 109 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L110" class="LineNr"> 110 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L111" class="LineNr"> 111 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L112" class="LineNr"> 112 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L113" class="LineNr"> 113 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L114" class="LineNr"> 114 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L115" class="LineNr"> 115 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L116" class="LineNr"> 116 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L117" class="LineNr"> 117 </span>   <span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
-<span id="L118" class="LineNr"> 118 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
-<span id="L119" class="LineNr"> 119 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L120" class="LineNr"> 120 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L121" class="LineNr"> 121 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L109" class="LineNr"> 109 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L110" class="LineNr"> 110 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L111" class="LineNr"> 111 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L112" class="LineNr"> 112 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L113" class="LineNr"> 113 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L114" class="LineNr"> 114 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L115" class="LineNr"> 115 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L116" class="LineNr"> 116 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L117" class="LineNr"> 117 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
+<span id="L118" class="LineNr"> 118 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎3                                                .</span>
+<span id="L119" class="LineNr"> 119 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L120" class="LineNr"> 120 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L121" class="LineNr"> 121 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L122" class="LineNr"> 122 </span>  ]
 <span id="L123" class="LineNr"> 123 </span>]
 <span id="L124" class="LineNr"> 124 </span>
 <span id="L125" class="LineNr"> 125 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L61'>&lt;global-keypress&gt;</a></span> [
 <span id="L126" class="LineNr"> 126 </span>  <span class="Comment"># F4? load all code and run all sandboxes.</span>
 <span id="L127" class="LineNr"> 127 </span>  <span class="Delimiter">{</span>
-<span id="L128" class="LineNr"> 128 </span>    do-run?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65532/F4</span>
-<span id="L129" class="LineNr"> 129 </span>    <span class="muControl">break-unless</span> do-run?
-<span id="L130" class="LineNr"> 130 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[running...       ]</span>, <span class="Constant">245/grey</span>
-<span id="L131" class="LineNr"> 131 </span>    error?:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L143'>run-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L132" class="LineNr"> 132 </span>    <span class="Comment"># F4 might update warnings and results on both sides</span>
-<span id="L133" class="LineNr"> 133 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L134" class="LineNr"> 134 </span>    <span class="Delimiter">{</span>
-<span id="L135" class="LineNr"> 135 </span>      <span class="muControl">break-if</span> error?
-<span id="L136" class="LineNr"> 136 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[                 ]</span>, <span class="Constant">245/grey</span>
-<span id="L137" class="LineNr"> 137 </span>    <span class="Delimiter">}</span>
-<span id="L138" class="LineNr"> 138 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L139" class="LineNr"> 139 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L128" class="LineNr"> 128 </span>  <span class="Conceal">¦</span> do-run?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65532/F4</span>
+<span id="L129" class="LineNr"> 129 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> do-run?
+<span id="L130" class="LineNr"> 130 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[running...       ]</span>, <span class="Constant">245/grey</span>
+<span id="L131" class="LineNr"> 131 </span>  <span class="Conceal">¦</span> error?:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L143'>run-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L132" class="LineNr"> 132 </span>  <span class="Conceal">¦</span> <span class="Comment"># F4 might update warnings and results on both sides</span>
+<span id="L133" class="LineNr"> 133 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L134" class="LineNr"> 134 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L135" class="LineNr"> 135 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> error?
+<span id="L136" class="LineNr"> 136 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[                 ]</span>, <span class="Constant">245/grey</span>
+<span id="L137" class="LineNr"> 137 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L138" class="LineNr"> 138 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L139" class="LineNr"> 139 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L140" class="LineNr"> 140 </span>  <span class="Delimiter">}</span>
 <span id="L141" class="LineNr"> 141 </span>]
 <span id="L142" class="LineNr"> 142 </span>
@@ -210,24 +211,24 @@ if ('onhashchange' in window) {
 <span id="L149" class="LineNr"> 149 </span><span class="Constant">  <a href='005-sandbox.mu.html#L149'>&lt;run-sandboxes-begin&gt;</a></span>
 <span id="L150" class="LineNr"> 150 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
 <span id="L151" class="LineNr"> 151 </span>  <span class="Delimiter">{</span>
-<span id="L152" class="LineNr"> 152 </span>    sandbox-contents:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L609'>editor-contents</a> current-sandbox
-<span id="L153" class="LineNr"> 153 </span>    <span class="muControl">break-unless</span> sandbox-contents
-<span id="L154" class="LineNr"> 154 </span>    <span class="Comment"># if contents exist, first save them</span>
-<span id="L155" class="LineNr"> 155 </span>    <span class="Comment"># run them and turn them into a new sandbox</span>
-<span id="L156" class="LineNr"> 156 </span>    new-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
-<span id="L157" class="LineNr"> 157 </span>    *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">data:offset</span>, sandbox-contents
-<span id="L158" class="LineNr"> 158 </span>    <span class="Comment"># push to head of sandbox list</span>
-<span id="L159" class="LineNr"> 159 </span>    dest:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
-<span id="L160" class="LineNr"> 160 </span>    *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">next-sandbox:offset</span>, dest
-<span id="L161" class="LineNr"> 161 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, new-sandbox
-<span id="L162" class="LineNr"> 162 </span>    <span class="Comment"># update sandbox count</span>
-<span id="L163" class="LineNr"> 163 </span>    sandbox-count:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
-<span id="L164" class="LineNr"> 164 </span>    sandbox-count <span class="Special">&lt;-</span> add sandbox-count,<span class="Constant"> 1</span>
-<span id="L165" class="LineNr"> 165 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, sandbox-count
-<span id="L166" class="LineNr"> 166 </span>    <span class="Comment"># clear sandbox editor</span>
-<span id="L167" class="LineNr"> 167 </span>    init:&amp;:duplex-list:char <span class="Special">&lt;-</span> push <span class="Constant">167/§</span>, <span class="Constant">0/tail</span>
-<span id="L168" class="LineNr"> 168 </span>    *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">data:offset</span>, init
-<span id="L169" class="LineNr"> 169 </span>    *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">top-of-screen:offset</span>, init
+<span id="L152" class="LineNr"> 152 </span>  <span class="Conceal">¦</span> sandbox-contents:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L609'>editor-contents</a> current-sandbox
+<span id="L153" class="LineNr"> 153 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-contents
+<span id="L154" class="LineNr"> 154 </span>  <span class="Conceal">¦</span> <span class="Comment"># if contents exist, first save them</span>
+<span id="L155" class="LineNr"> 155 </span>  <span class="Conceal">¦</span> <span class="Comment"># run them and turn them into a new sandbox</span>
+<span id="L156" class="LineNr"> 156 </span>  <span class="Conceal">¦</span> new-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
+<span id="L157" class="LineNr"> 157 </span>  <span class="Conceal">¦</span> *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">data:offset</span>, sandbox-contents
+<span id="L158" class="LineNr"> 158 </span>  <span class="Conceal">¦</span> <span class="Comment"># push to head of sandbox list</span>
+<span id="L159" class="LineNr"> 159 </span>  <span class="Conceal">¦</span> dest:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L160" class="LineNr"> 160 </span>  <span class="Conceal">¦</span> *new-sandbox <span class="Special">&lt;-</span> put *new-sandbox, <span class="Constant">next-sandbox:offset</span>, dest
+<span id="L161" class="LineNr"> 161 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, new-sandbox
+<span id="L162" class="LineNr"> 162 </span>  <span class="Conceal">¦</span> <span class="Comment"># update sandbox count</span>
+<span id="L163" class="LineNr"> 163 </span>  <span class="Conceal">¦</span> sandbox-count:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
+<span id="L164" class="LineNr"> 164 </span>  <span class="Conceal">¦</span> sandbox-count <span class="Special">&lt;-</span> add sandbox-count,<span class="Constant"> 1</span>
+<span id="L165" class="LineNr"> 165 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, sandbox-count
+<span id="L166" class="LineNr"> 166 </span>  <span class="Conceal">¦</span> <span class="Comment"># clear sandbox editor</span>
+<span id="L167" class="LineNr"> 167 </span>  <span class="Conceal">¦</span> init:&amp;:duplex-list:char <span class="Special">&lt;-</span> push <span class="Constant">167/§</span>, <span class="Constant">0/tail</span>
+<span id="L168" class="LineNr"> 168 </span>  <span class="Conceal">¦</span> *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">data:offset</span>, init
+<span id="L169" class="LineNr"> 169 </span>  <span class="Conceal">¦</span> *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">top-of-screen:offset</span>, init
 <span id="L170" class="LineNr"> 170 </span>  <span class="Delimiter">}</span>
 <span id="L171" class="LineNr"> 171 </span>  <span class="Comment"># save all sandboxes before running, just in case we die when running</span>
 <span id="L172" class="LineNr"> 172 </span>  <a href='005-sandbox.mu.html#L215'>save-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>
@@ -235,11 +236,11 @@ if ('onhashchange' in window) {
 <span id="L174" class="LineNr"> 174 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
 <span id="L175" class="LineNr"> 175 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L176" class="LineNr"> 176 </span>  <span class="Delimiter">{</span>
-<span id="L177" class="LineNr"> 177 </span>    <span class="muControl">break-unless</span> curr
-<span id="L178" class="LineNr"> 178 </span>    curr <span class="Special">&lt;-</span> update-sandbox curr, env, idx
-<span id="L179" class="LineNr"> 179 </span>    curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
-<span id="L180" class="LineNr"> 180 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
-<span id="L181" class="LineNr"> 181 </span>    <span class="muControl">loop</span>
+<span id="L177" class="LineNr"> 177 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L178" class="LineNr"> 178 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> update-sandbox curr, env, idx
+<span id="L179" class="LineNr"> 179 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
+<span id="L180" class="LineNr"> 180 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L181" class="LineNr"> 181 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L182" class="LineNr"> 182 </span>  <span class="Delimiter">}</span>
 <span id="L183" class="LineNr"> 183 </span><span class="Constant">  <a href='005-sandbox.mu.html#L183'>&lt;run-sandboxes-end&gt;</a></span>
 <span id="L184" class="LineNr"> 184 </span>]
@@ -282,14 +283,14 @@ if ('onhashchange' in window) {
 <span id="L221" class="LineNr"> 221 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
 <span id="L222" class="LineNr"> 222 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L223" class="LineNr"> 223 </span>  <span class="Delimiter">{</span>
-<span id="L224" class="LineNr"> 224 </span>    <span class="muControl">break-unless</span> curr
-<span id="L225" class="LineNr"> 225 </span>    data:text <span class="Special">&lt;-</span> get *curr, <span class="Constant">data:offset</span>
-<span id="L226" class="LineNr"> 226 </span>    filename:text <span class="Special">&lt;-</span> append <span class="Constant">[lesson/]</span>, idx
-<span id="L227" class="LineNr"> 227 </span>    <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='../088file.mu.html#L127'>dump</a> <a href='../088file.mu.html#L11'>resources</a>, filename, data
-<span id="L228" class="LineNr"> 228 </span><span class="Constant">    <a href='005-sandbox.mu.html#L228'>&lt;end-save-sandbox&gt;</a></span>
-<span id="L229" class="LineNr"> 229 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
-<span id="L230" class="LineNr"> 230 </span>    curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
-<span id="L231" class="LineNr"> 231 </span>    <span class="muControl">loop</span>
+<span id="L224" class="LineNr"> 224 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L225" class="LineNr"> 225 </span>  <span class="Conceal">¦</span> data:text <span class="Special">&lt;-</span> get *curr, <span class="Constant">data:offset</span>
+<span id="L226" class="LineNr"> 226 </span>  <span class="Conceal">¦</span> filename:text <span class="Special">&lt;-</span> append <span class="Constant">[lesson/]</span>, idx
+<span id="L227" class="LineNr"> 227 </span>  <span class="Conceal">¦</span> <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='../088file.mu.html#L127'>dump</a> <a href='../088file.mu.html#L11'>resources</a>, filename, data
+<span id="L228" class="LineNr"> 228 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='005-sandbox.mu.html#L228'>&lt;end-save-sandbox&gt;</a></span>
+<span id="L229" class="LineNr"> 229 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L230" class="LineNr"> 230 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
+<span id="L231" class="LineNr"> 231 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L232" class="LineNr"> 232 </span>  <span class="Delimiter">}</span>
 <span id="L233" class="LineNr"> 233 </span>]
 <span id="L234" class="LineNr"> 234 </span>
@@ -304,11 +305,11 @@ if ('onhashchange' in window) {
 <span id="L243" class="LineNr"> 243 </span>  <span class="Comment"># render sandbox editor</span>
 <span id="L244" class="LineNr"> 244 </span>  render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
 <span id="L245" class="LineNr"> 245 </span>  <span class="Delimiter">{</span>
-<span id="L246" class="LineNr"> 246 </span>    render-current-sandbox?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
-<span id="L247" class="LineNr"> 247 </span>    <span class="muControl">break-unless</span> render-current-sandbox?
-<span id="L248" class="LineNr"> 248 </span>    row, column, <a href='../081print.mu.html#L4'>screen</a>, current-sandbox <span class="Special">&lt;-</span> call render-editor, <a href='../081print.mu.html#L4'>screen</a>, current-sandbox
-<span id="L249" class="LineNr"> 249 </span>    <a href='001-editor.mu.html#L224'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>, row, column, left, right
-<span id="L250" class="LineNr"> 250 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L246" class="LineNr"> 246 </span>  <span class="Conceal">¦</span> render-current-sandbox?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
+<span id="L247" class="LineNr"> 247 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render-current-sandbox?
+<span id="L248" class="LineNr"> 248 </span>  <span class="Conceal">¦</span> row, column, <a href='../081print.mu.html#L4'>screen</a>, current-sandbox <span class="Special">&lt;-</span> call render-editor, <a href='../081print.mu.html#L4'>screen</a>, current-sandbox
+<span id="L249" class="LineNr"> 249 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L224'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>, row, column, left, right
+<span id="L250" class="LineNr"> 250 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
 <span id="L251" class="LineNr"> 251 </span>  <span class="Delimiter">}</span>
 <span id="L252" class="LineNr"> 252 </span>  <span class="Comment"># render sandboxes</span>
 <span id="L253" class="LineNr"> 253 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right
@@ -326,45 +327,45 @@ if ('onhashchange' in window) {
 <span id="L265" class="LineNr"> 265 </span>  <span class="muControl">return-if</span> at-bottom?:bool
 <span id="L266" class="LineNr"> 266 </span>  hidden?:bool <span class="Special">&lt;-</span> lesser-than idx, render-from
 <span id="L267" class="LineNr"> 267 </span>  <span class="Delimiter">{</span>
-<span id="L268" class="LineNr"> 268 </span>    <span class="muControl">break-if</span> hidden?
-<span id="L269" class="LineNr"> 269 </span>    <span class="Comment"># render sandbox menu</span>
-<span id="L270" class="LineNr"> 270 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L271" class="LineNr"> 271 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
-<span id="L272" class="LineNr"> 272 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L314'>render-sandbox-menu</a> <a href='../081print.mu.html#L4'>screen</a>, idx, left, right
-<span id="L273" class="LineNr"> 273 </span>    <span class="Comment"># save menu row so we can detect clicks to it later</span>
-<span id="L274" class="LineNr"> 274 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>, row
-<span id="L275" class="LineNr"> 275 </span>    <span class="Comment"># render sandbox contents</span>
-<span id="L276" class="LineNr"> 276 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L277" class="LineNr"> 277 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
-<span id="L278" class="LineNr"> 278 </span>    sandbox-data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
-<span id="L279" class="LineNr"> 279 </span>    row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L529'>render-code</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-data, left, right, row
-<span id="L280" class="LineNr"> 280 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, row
-<span id="L281" class="LineNr"> 281 </span>    <span class="Comment"># render sandbox warnings, screen or response, in that order</span>
-<span id="L282" class="LineNr"> 282 </span>    sandbox-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response:offset</span>
-<span id="L283" class="LineNr"> 283 </span><span class="Constant">    <a href='005-sandbox.mu.html#L283'>&lt;render-sandbox-results&gt;</a></span>
-<span id="L284" class="LineNr"> 284 </span>    <span class="Delimiter">{</span>
-<span id="L285" class="LineNr"> 285 </span>      sandbox-screen:&amp;:<a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant"><a href='../081print.mu.html#L4'>screen</a>:offset</span>
-<span id="L286" class="LineNr"> 286 </span>      empty-screen?:bool <span class="Special">&lt;-</span> <a href='../081print.mu.html#L60'>fake-screen-is-empty?</a> sandbox-screen
-<span id="L287" class="LineNr"> 287 </span>      <span class="muControl">break-if</span> empty-screen?
-<span id="L288" class="LineNr"> 288 </span>      row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L451'>render-screen</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-screen, left, right, row
-<span id="L289" class="LineNr"> 289 </span>    <span class="Delimiter">}</span>
-<span id="L290" class="LineNr"> 290 </span>    <span class="Delimiter">{</span>
-<span id="L291" class="LineNr"> 291 </span>      <span class="muControl">break-unless</span> empty-screen?
-<span id="L292" class="LineNr"> 292 </span><span class="Constant">      <a href='005-sandbox.mu.html#L292'>&lt;render-sandbox-response&gt;</a></span>
-<span id="L293" class="LineNr"> 293 </span>      row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-response, left, right, <span class="Constant">245/grey</span>, row
-<span id="L294" class="LineNr"> 294 </span>    <span class="Delimiter">}</span>
-<span id="L295" class="LineNr"> 295 </span><span class="Constant">    +render-sandbox-end</span>
-<span id="L296" class="LineNr"> 296 </span>    at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L297" class="LineNr"> 297 </span>    <span class="muControl">return-if</span> at-bottom?
-<span id="L298" class="LineNr"> 298 </span>    <span class="Comment"># draw solid line after sandbox</span>
-<span id="L299" class="LineNr"> 299 </span>    <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right
+<span id="L268" class="LineNr"> 268 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> hidden?
+<span id="L269" class="LineNr"> 269 </span>  <span class="Conceal">¦</span> <span class="Comment"># render sandbox menu</span>
+<span id="L270" class="LineNr"> 270 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L271" class="LineNr"> 271 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
+<span id="L272" class="LineNr"> 272 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L314'>render-sandbox-menu</a> <a href='../081print.mu.html#L4'>screen</a>, idx, left, right
+<span id="L273" class="LineNr"> 273 </span>  <span class="Conceal">¦</span> <span class="Comment"># save menu row so we can detect clicks to it later</span>
+<span id="L274" class="LineNr"> 274 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>, row
+<span id="L275" class="LineNr"> 275 </span>  <span class="Conceal">¦</span> <span class="Comment"># render sandbox contents</span>
+<span id="L276" class="LineNr"> 276 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L277" class="LineNr"> 277 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
+<span id="L278" class="LineNr"> 278 </span>  <span class="Conceal">¦</span> sandbox-data:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">data:offset</span>
+<span id="L279" class="LineNr"> 279 </span>  <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L529'>render-code</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-data, left, right, row
+<span id="L280" class="LineNr"> 280 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>, row
+<span id="L281" class="LineNr"> 281 </span>  <span class="Conceal">¦</span> <span class="Comment"># render sandbox warnings, screen or response, in that order</span>
+<span id="L282" class="LineNr"> 282 </span>  <span class="Conceal">¦</span> sandbox-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response:offset</span>
+<span id="L283" class="LineNr"> 283 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='005-sandbox.mu.html#L283'>&lt;render-sandbox-results&gt;</a></span>
+<span id="L284" class="LineNr"> 284 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L285" class="LineNr"> 285 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> sandbox-screen:&amp;:<a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> get *sandbox, <span class="Constant"><a href='../081print.mu.html#L4'>screen</a>:offset</span>
+<span id="L286" class="LineNr"> 286 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> empty-screen?:bool <span class="Special">&lt;-</span> <a href='../081print.mu.html#L60'>fake-screen-is-empty?</a> sandbox-screen
+<span id="L287" class="LineNr"> 287 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> empty-screen?
+<span id="L288" class="LineNr"> 288 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L451'>render-screen</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-screen, left, right, row
+<span id="L289" class="LineNr"> 289 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L290" class="LineNr"> 290 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L291" class="LineNr"> 291 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> empty-screen?
+<span id="L292" class="LineNr"> 292 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> <a href='005-sandbox.mu.html#L292'>&lt;render-sandbox-response&gt;</a></span>
+<span id="L293" class="LineNr"> 293 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-response, left, right, <span class="Constant">245/grey</span>, row
+<span id="L294" class="LineNr"> 294 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L295" class="LineNr"> 295 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +render-sandbox-end</span>
+<span id="L296" class="LineNr"> 296 </span>  <span class="Conceal">¦</span> at-bottom?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L297" class="LineNr"> 297 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> at-bottom?
+<span id="L298" class="LineNr"> 298 </span>  <span class="Conceal">¦</span> <span class="Comment"># draw solid line after sandbox</span>
+<span id="L299" class="LineNr"> 299 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right
 <span id="L300" class="LineNr"> 300 </span>  <span class="Delimiter">}</span>
 <span id="L301" class="LineNr"> 301 </span>  <span class="Comment"># if hidden, reset row attributes</span>
 <span id="L302" class="LineNr"> 302 </span>  <span class="Delimiter">{</span>
-<span id="L303" class="LineNr"> 303 </span>    <span class="muControl">break-unless</span> hidden?
-<span id="L304" class="LineNr"> 304 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>,<span class="Constant"> 0</span>
-<span id="L305" class="LineNr"> 305 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>,<span class="Constant"> 0</span>
-<span id="L306" class="LineNr"> 306 </span><span class="Constant">    <a href='005-sandbox.mu.html#L306'>&lt;end-render-sandbox-reset-hidden&gt;</a></span>
+<span id="L303" class="LineNr"> 303 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> hidden?
+<span id="L304" class="LineNr"> 304 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">starting-row-on-screen:offset</span>,<span class="Constant"> 0</span>
+<span id="L305" class="LineNr"> 305 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>,<span class="Constant"> 0</span>
+<span id="L306" class="LineNr"> 306 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='005-sandbox.mu.html#L306'>&lt;end-render-sandbox-reset-hidden&gt;</a></span>
 <span id="L307" class="LineNr"> 307 </span>  <span class="Delimiter">}</span>
 <span id="L308" class="LineNr"> 308 </span>  <span class="Comment"># draw next sandbox</span>
 <span id="L309" class="LineNr"> 309 </span>  next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
@@ -424,52 +425,52 @@ if ('onhashchange' in window) {
 <span id="L363" class="LineNr"> 363 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L364" class="LineNr"> 364 </span>  len:num <span class="Special">&lt;-</span> length *s
 <span id="L365" class="LineNr"> 365 </span>  <span class="Delimiter">{</span>
-<span id="L366" class="LineNr"> 366 </span><span class="Constant">    +next-character</span>
-<span id="L367" class="LineNr"> 367 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L368" class="LineNr"> 368 </span>    <span class="muControl">break-if</span> done?
-<span id="L369" class="LineNr"> 369 </span>    done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L370" class="LineNr"> 370 </span>    <span class="muControl">break-if</span> done?
-<span id="L371" class="LineNr"> 371 </span>    c:char <span class="Special">&lt;-</span> index *s, i
-<span id="L372" class="LineNr"> 372 </span>    <span class="Delimiter">{</span>
-<span id="L373" class="LineNr"> 373 </span>      <span class="Comment"># at right? wrap.</span>
-<span id="L374" class="LineNr"> 374 </span>      at-right?:bool <span class="Special">&lt;-</span> equal column, right
-<span id="L375" class="LineNr"> 375 </span>      <span class="muControl">break-unless</span> at-right?
-<span id="L376" class="LineNr"> 376 </span>      <span class="Comment"># print wrap icon</span>
-<span id="L377" class="LineNr"> 377 </span>      wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
-<span id="L378" class="LineNr"> 378 </span>      print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
-<span id="L379" class="LineNr"> 379 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L380" class="LineNr"> 380 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L381" class="LineNr"> 381 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L382" class="LineNr"> 382 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>  <span class="Comment"># retry i</span>
-<span id="L383" class="LineNr"> 383 </span>    <span class="Delimiter">}</span>
-<span id="L384" class="LineNr"> 384 </span>    i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L385" class="LineNr"> 385 </span>    <span class="Delimiter">{</span>
-<span id="L386" class="LineNr"> 386 </span>      <span class="Comment"># newline? move to left rather than 0</span>
-<span id="L387" class="LineNr"> 387 </span>      newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
-<span id="L388" class="LineNr"> 388 </span>      <span class="muControl">break-unless</span> newline?
-<span id="L389" class="LineNr"> 389 </span>      <span class="Comment"># clear rest of line in this window</span>
-<span id="L390" class="LineNr"> 390 </span>      <span class="Delimiter">{</span>
-<span id="L391" class="LineNr"> 391 </span>        done?:bool <span class="Special">&lt;-</span> greater-than column, right
-<span id="L392" class="LineNr"> 392 </span>        <span class="muControl">break-if</span> done?
-<span id="L393" class="LineNr"> 393 </span>        space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
-<span id="L394" class="LineNr"> 394 </span>        print <a href='../081print.mu.html#L4'>screen</a>, space
-<span id="L395" class="LineNr"> 395 </span>        column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L396" class="LineNr"> 396 </span>        <span class="muControl">loop</span>
-<span id="L397" class="LineNr"> 397 </span>      <span class="Delimiter">}</span>
-<span id="L398" class="LineNr"> 398 </span>      row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L399" class="LineNr"> 399 </span>      column <span class="Special">&lt;-</span> copy left
-<span id="L400" class="LineNr"> 400 </span>      <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L401" class="LineNr"> 401 </span>      <span class="muControl">loop</span> <span class="Constant">+next-character</span>
-<span id="L402" class="LineNr"> 402 </span>    <span class="Delimiter">}</span>
-<span id="L403" class="LineNr"> 403 </span>    print <a href='../081print.mu.html#L4'>screen</a>, c, color
-<span id="L404" class="LineNr"> 404 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L405" class="LineNr"> 405 </span>    <span class="muControl">loop</span>
+<span id="L366" class="LineNr"> 366 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L367" class="LineNr"> 367 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L368" class="LineNr"> 368 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L369" class="LineNr"> 369 </span>  <span class="Conceal">¦</span> done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L370" class="LineNr"> 370 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L371" class="LineNr"> 371 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *s, i
+<span id="L372" class="LineNr"> 372 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L373" class="LineNr"> 373 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># at right? wrap.</span>
+<span id="L374" class="LineNr"> 374 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
+<span id="L375" class="LineNr"> 375 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
+<span id="L376" class="LineNr"> 376 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
+<span id="L377" class="LineNr"> 377 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
+<span id="L378" class="LineNr"> 378 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
+<span id="L379" class="LineNr"> 379 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L380" class="LineNr"> 380 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L381" class="LineNr"> 381 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L382" class="LineNr"> 382 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>  <span class="Comment"># retry i</span>
+<span id="L383" class="LineNr"> 383 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L384" class="LineNr"> 384 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L385" class="LineNr"> 385 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L386" class="LineNr"> 386 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
+<span id="L387" class="LineNr"> 387 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
+<span id="L388" class="LineNr"> 388 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L389" class="LineNr"> 389 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
+<span id="L390" class="LineNr"> 390 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L391" class="LineNr"> 391 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-than column, right
+<span id="L392" class="LineNr"> 392 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L393" class="LineNr"> 393 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
+<span id="L394" class="LineNr"> 394 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, space
+<span id="L395" class="LineNr"> 395 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L396" class="LineNr"> 396 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L397" class="LineNr"> 397 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L398" class="LineNr"> 398 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L399" class="LineNr"> 399 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L400" class="LineNr"> 400 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L401" class="LineNr"> 401 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L402" class="LineNr"> 402 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L403" class="LineNr"> 403 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
+<span id="L404" class="LineNr"> 404 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L405" class="LineNr"> 405 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L406" class="LineNr"> 406 </span>  <span class="Delimiter">}</span>
 <span id="L407" class="LineNr"> 407 </span>  was-at-left?:bool <span class="Special">&lt;-</span> equal column, left
 <span id="L408" class="LineNr"> 408 </span>  <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
 <span id="L409" class="LineNr"> 409 </span>  <span class="Delimiter">{</span>
-<span id="L410" class="LineNr"> 410 </span>    <span class="muControl">break-if</span> was-at-left?
-<span id="L411" class="LineNr"> 411 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L410" class="LineNr"> 410 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> was-at-left?
+<span id="L411" class="LineNr"> 411 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
 <span id="L412" class="LineNr"> 412 </span>  <span class="Delimiter">}</span>
 <span id="L413" class="LineNr"> 413 </span>  <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
 <span id="L414" class="LineNr"> 414 </span>]
@@ -483,25 +484,25 @@ if ('onhashchange' in window) {
 <span id="L422" class="LineNr"> 422 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L423" class="LineNr"> 423 </span>  <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:sandbox <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L424" class="LineNr"> 424 </span>  <span class="Delimiter">{</span>
-<span id="L425" class="LineNr"> 425 </span>    filename:text <span class="Special">&lt;-</span> append <span class="Constant">[lesson/]</span>, idx
-<span id="L426" class="LineNr"> 426 </span>    contents:text <span class="Special">&lt;-</span> <a href='../088file.mu.html#L38'>slurp</a> <a href='../088file.mu.html#L11'>resources</a>, filename
-<span id="L427" class="LineNr"> 427 </span>    <span class="muControl">break-unless</span> contents  <span class="Comment"># stop at first error; assuming file didn't exist</span>
-<span id="L428" class="LineNr"> 428 </span>                           <span class="Comment"># todo: handle empty sandbox</span>
-<span id="L429" class="LineNr"> 429 </span>    <span class="Comment"># create new sandbox for file</span>
-<span id="L430" class="LineNr"> 430 </span>    curr <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
-<span id="L431" class="LineNr"> 431 </span>    *curr <span class="Special">&lt;-</span> put *curr, <span class="Constant">data:offset</span>, contents
-<span id="L432" class="LineNr"> 432 </span><span class="Constant">    <a href='005-sandbox.mu.html#L432'>&lt;end-restore-sandbox&gt;</a></span>
-<span id="L433" class="LineNr"> 433 </span>    <span class="Delimiter">{</span>
-<span id="L434" class="LineNr"> 434 </span>      <span class="muControl">break-if</span> idx
-<span id="L435" class="LineNr"> 435 </span>      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, curr
-<span id="L436" class="LineNr"> 436 </span>    <span class="Delimiter">}</span>
-<span id="L437" class="LineNr"> 437 </span>    <span class="Delimiter">{</span>
-<span id="L438" class="LineNr"> 438 </span>      <span class="muControl">break-unless</span> idx
-<span id="L439" class="LineNr"> 439 </span>      *prev <span class="Special">&lt;-</span> put *prev, <span class="Constant">next-sandbox:offset</span>, curr
-<span id="L440" class="LineNr"> 440 </span>    <span class="Delimiter">}</span>
-<span id="L441" class="LineNr"> 441 </span>    idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
-<span id="L442" class="LineNr"> 442 </span>    <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> copy curr
-<span id="L443" class="LineNr"> 443 </span>    <span class="muControl">loop</span>
+<span id="L425" class="LineNr"> 425 </span>  <span class="Conceal">¦</span> filename:text <span class="Special">&lt;-</span> append <span class="Constant">[lesson/]</span>, idx
+<span id="L426" class="LineNr"> 426 </span>  <span class="Conceal">¦</span> contents:text <span class="Special">&lt;-</span> <a href='../088file.mu.html#L38'>slurp</a> <a href='../088file.mu.html#L11'>resources</a>, filename
+<span id="L427" class="LineNr"> 427 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> contents  <span class="Comment"># stop at first error; assuming file didn't exist</span>
+<span id="L428" class="LineNr"> 428 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span>      <span class="Comment"># todo: handle empty sandbox</span>
+<span id="L429" class="LineNr"> 429 </span>  <span class="Conceal">¦</span> <span class="Comment"># create new sandbox for file</span>
+<span id="L430" class="LineNr"> 430 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> new <span class="Constant">sandbox:type</span>
+<span id="L431" class="LineNr"> 431 </span>  <span class="Conceal">¦</span> *curr <span class="Special">&lt;-</span> put *curr, <span class="Constant">data:offset</span>, contents
+<span id="L432" class="LineNr"> 432 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='005-sandbox.mu.html#L432'>&lt;end-restore-sandbox&gt;</a></span>
+<span id="L433" class="LineNr"> 433 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L434" class="LineNr"> 434 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> idx
+<span id="L435" class="LineNr"> 435 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, curr
+<span id="L436" class="LineNr"> 436 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L437" class="LineNr"> 437 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L438" class="LineNr"> 438 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> idx
+<span id="L439" class="LineNr"> 439 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *prev <span class="Special">&lt;-</span> put *prev, <span class="Constant">next-sandbox:offset</span>, curr
+<span id="L440" class="LineNr"> 440 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L441" class="LineNr"> 441 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
+<span id="L442" class="LineNr"> 442 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> copy curr
+<span id="L443" class="LineNr"> 443 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L444" class="LineNr"> 444 </span>  <span class="Delimiter">}</span>
 <span id="L445" class="LineNr"> 445 </span>  <span class="Comment"># update sandbox count</span>
 <span id="L446" class="LineNr"> 446 </span>  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, idx
@@ -527,50 +528,50 @@ if ('onhashchange' in window) {
 <span id="L466" class="LineNr"> 466 </span>  len:num <span class="Special">&lt;-</span> length *buf
 <span id="L467" class="LineNr"> 467 </span>  <a href='../081print.mu.html#L594'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L594'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
 <span id="L468" class="LineNr"> 468 </span>  <span class="Delimiter">{</span>
-<span id="L469" class="LineNr"> 469 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L470" class="LineNr"> 470 </span>    <span class="muControl">break-if</span> done?
-<span id="L471" class="LineNr"> 471 </span>    done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
-<span id="L472" class="LineNr"> 472 </span>    <span class="muControl">break-if</span> done?
-<span id="L473" class="LineNr"> 473 </span>    column <span class="Special">&lt;-</span> copy left
-<span id="L474" class="LineNr"> 474 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L475" class="LineNr"> 475 </span>    <span class="Comment"># initial leader for each row: two spaces and a '.'</span>
-<span id="L476" class="LineNr"> 476 </span>    space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
-<span id="L477" class="LineNr"> 477 </span>    print <a href='../081print.mu.html#L4'>screen</a>, space, <span class="Constant">245/grey</span>
-<span id="L478" class="LineNr"> 478 </span>    print <a href='../081print.mu.html#L4'>screen</a>, space, <span class="Constant">245/grey</span>
-<span id="L479" class="LineNr"> 479 </span>    full-stop:char <span class="Special">&lt;-</span> copy <span class="Constant">46/period</span>
-<span id="L480" class="LineNr"> 480 </span>    print <a href='../081print.mu.html#L4'>screen</a>, full-stop, <span class="Constant">245/grey</span>
-<span id="L481" class="LineNr"> 481 </span>    column <span class="Special">&lt;-</span> add left,<span class="Constant"> 3</span>
-<span id="L482" class="LineNr"> 482 </span>    <span class="Delimiter">{</span>
-<span id="L483" class="LineNr"> 483 </span>      <span class="Comment"># print row</span>
-<span id="L484" class="LineNr"> 484 </span>      row-done?:bool <span class="Special">&lt;-</span> greater-or-equal column, max-column
-<span id="L485" class="LineNr"> 485 </span>      <span class="muControl">break-if</span> row-done?
-<span id="L486" class="LineNr"> 486 </span>      curr:<a href='../081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> index *buf, i
-<span id="L487" class="LineNr"> 487 </span>      c:char <span class="Special">&lt;-</span> get curr, <span class="Constant">contents:offset</span>
-<span id="L488" class="LineNr"> 488 </span>      color:num <span class="Special">&lt;-</span> get curr, <span class="Constant">color:offset</span>
-<span id="L489" class="LineNr"> 489 </span>      <span class="Delimiter">{</span>
-<span id="L490" class="LineNr"> 490 </span>        <span class="Comment"># damp whites down to grey</span>
-<span id="L491" class="LineNr"> 491 </span>        white?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">7/white</span>
-<span id="L492" class="LineNr"> 492 </span>        <span class="muControl">break-unless</span> white?
-<span id="L493" class="LineNr"> 493 </span>        color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
-<span id="L494" class="LineNr"> 494 </span>      <span class="Delimiter">}</span>
-<span id="L495" class="LineNr"> 495 </span>      print <a href='../081print.mu.html#L4'>screen</a>, c, color
-<span id="L496" class="LineNr"> 496 </span>      column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L497" class="LineNr"> 497 </span>      i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L498" class="LineNr"> 498 </span>      <span class="muControl">loop</span>
-<span id="L499" class="LineNr"> 499 </span>    <span class="Delimiter">}</span>
-<span id="L500" class="LineNr"> 500 </span>    <span class="Comment"># print final '.'</span>
-<span id="L501" class="LineNr"> 501 </span>    print <a href='../081print.mu.html#L4'>screen</a>, full-stop, <span class="Constant">245/grey</span>
-<span id="L502" class="LineNr"> 502 </span>    column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L503" class="LineNr"> 503 </span>    <span class="Delimiter">{</span>
-<span id="L504" class="LineNr"> 504 </span>      <span class="Comment"># clear rest of current line</span>
-<span id="L505" class="LineNr"> 505 </span>      line-done?:bool <span class="Special">&lt;-</span> greater-than column, right
-<span id="L506" class="LineNr"> 506 </span>      <span class="muControl">break-if</span> line-done?
-<span id="L507" class="LineNr"> 507 </span>      print <a href='../081print.mu.html#L4'>screen</a>, space
-<span id="L508" class="LineNr"> 508 </span>      column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L509" class="LineNr"> 509 </span>      <span class="muControl">loop</span>
-<span id="L510" class="LineNr"> 510 </span>    <span class="Delimiter">}</span>
-<span id="L511" class="LineNr"> 511 </span>    row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L512" class="LineNr"> 512 </span>    <span class="muControl">loop</span>
+<span id="L469" class="LineNr"> 469 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L470" class="LineNr"> 470 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L471" class="LineNr"> 471 </span>  <span class="Conceal">¦</span> done? <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
+<span id="L472" class="LineNr"> 472 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L473" class="LineNr"> 473 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L474" class="LineNr"> 474 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L475" class="LineNr"> 475 </span>  <span class="Conceal">¦</span> <span class="Comment"># initial leader for each row: two spaces and a '.'</span>
+<span id="L476" class="LineNr"> 476 </span>  <span class="Conceal">¦</span> space:char <span class="Special">&lt;-</span> copy <span class="Constant">32/space</span>
+<span id="L477" class="LineNr"> 477 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, space, <span class="Constant">245/grey</span>
+<span id="L478" class="LineNr"> 478 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, space, <span class="Constant">245/grey</span>
+<span id="L479" class="LineNr"> 479 </span>  <span class="Conceal">¦</span> full-stop:char <span class="Special">&lt;-</span> copy <span class="Constant">46/period</span>
+<span id="L480" class="LineNr"> 480 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, full-stop, <span class="Constant">245/grey</span>
+<span id="L481" class="LineNr"> 481 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add left,<span class="Constant"> 3</span>
+<span id="L482" class="LineNr"> 482 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L483" class="LineNr"> 483 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print row</span>
+<span id="L484" class="LineNr"> 484 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row-done?:bool <span class="Special">&lt;-</span> greater-or-equal column, max-column
+<span id="L485" class="LineNr"> 485 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> row-done?
+<span id="L486" class="LineNr"> 486 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr:<a href='../081print.mu.html#L12'>screen-cell</a> <span class="Special">&lt;-</span> index *buf, i
+<span id="L487" class="LineNr"> 487 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get curr, <span class="Constant">contents:offset</span>
+<span id="L488" class="LineNr"> 488 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> color:num <span class="Special">&lt;-</span> get curr, <span class="Constant">color:offset</span>
+<span id="L489" class="LineNr"> 489 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L490" class="LineNr"> 490 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># damp whites down to grey</span>
+<span id="L491" class="LineNr"> 491 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> white?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">7/white</span>
+<span id="L492" class="LineNr"> 492 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> white?
+<span id="L493" class="LineNr"> 493 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
+<span id="L494" class="LineNr"> 494 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L495" class="LineNr"> 495 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
+<span id="L496" class="LineNr"> 496 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L497" class="LineNr"> 497 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<span id="L498" class="LineNr"> 498 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L499" class="LineNr"> 499 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L500" class="LineNr"> 500 </span>  <span class="Conceal">¦</span> <span class="Comment"># print final '.'</span>
+<span id="L501" class="LineNr"> 501 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, full-stop, <span class="Constant">245/grey</span>
+<span id="L502" class="LineNr"> 502 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L503" class="LineNr"> 503 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L504" class="LineNr"> 504 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of current line</span>
+<span id="L505" class="LineNr"> 505 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> line-done?:bool <span class="Special">&lt;-</span> greater-than column, right
+<span id="L506" class="LineNr"> 506 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> line-done?
+<span id="L507" class="LineNr"> 507 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, space
+<span id="L508" class="LineNr"> 508 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L509" class="LineNr"> 509 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L510" class="LineNr"> 510 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L511" class="LineNr"> 511 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L512" class="LineNr"> 512 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L513" class="LineNr"> 513 </span>  <span class="Delimiter">}</span>
 <span id="L514" class="LineNr"> 514 </span>]
 <span id="L515" class="LineNr"> 515 </span>
@@ -580,56 +581,56 @@ if ('onhashchange' in window) {
 <span id="L519" class="LineNr"> 519 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">12/height</span>
 <span id="L520" class="LineNr"> 520 </span>  <span class="Comment"># define a recipe (no indent for the 'add' line below so column numbers are more obvious)</span>
 <span id="L521" class="LineNr"> 521 </span>  assume-resources [
-<span id="L522" class="LineNr"> 522 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L523" class="LineNr"> 523 </span><span class="Constant">      ||</span>
-<span id="L524" class="LineNr"> 524 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L525" class="LineNr"> 525 </span><span class="Constant">      |  local-scope|</span>
-<span id="L526" class="LineNr"> 526 </span><span class="Constant">      |  z:num &lt;- add 2, 2|</span>
-<span id="L527" class="LineNr"> 527 </span><span class="Constant">      |  reply z|</span>
-<span id="L528" class="LineNr"> 528 </span><span class="Constant">      |]</span>|
-<span id="L529" class="LineNr"> 529 </span>    ]
+<span id="L522" class="LineNr"> 522 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L523" class="LineNr"> 523 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> ||</span>
+<span id="L524" class="LineNr"> 524 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L525" class="LineNr"> 525 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  local-scope|</span>
+<span id="L526" class="LineNr"> 526 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  z:num &lt;- add 2, 2|</span>
+<span id="L527" class="LineNr"> 527 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  reply z|</span>
+<span id="L528" class="LineNr"> 528 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L529" class="LineNr"> 529 </span>  <span class="Conceal">¦</span> ]
 <span id="L530" class="LineNr"> 530 </span>  ]
 <span id="L531" class="LineNr"> 531 </span>  <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
 <span id="L532" class="LineNr"> 532 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>  <span class="Comment"># contents of sandbox editor</span>
 <span id="L533" class="LineNr"> 533 </span>  <span class="Comment"># run the code in the editors</span>
 <span id="L534" class="LineNr"> 534 </span>  assume-console [
-<span id="L535" class="LineNr"> 535 </span>    press F4
+<span id="L535" class="LineNr"> 535 </span>  <span class="Conceal">¦</span> press F4
 <span id="L536" class="LineNr"> 536 </span>  ]
 <span id="L537" class="LineNr"> 537 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L538" class="LineNr"> 538 </span>  screen-should-contain [
-<span id="L539" class="LineNr"> 539 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L540" class="LineNr"> 540 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L541" class="LineNr"> 541 </span>   <span class="Constant"> .recipe foo [                                      ╎─────────────────────────────────────────────────.</span>
-<span id="L542" class="LineNr"> 542 </span>   <span class="Constant"> .  local-scope                                     ╎0   edit          copy            delete         .</span>
-<span id="L543" class="LineNr"> 543 </span>   <span class="Constant"> .  z:num &lt;- add 2, 2                               ╎foo                                              .</span>
-<span id="L544" class="LineNr"> 544 </span>   <span class="Constant"> .  reply z                                         ╎4                                                .</span>
-<span id="L545" class="LineNr"> 545 </span>   <span class="Constant"> .]                                                 ╎─────────────────────────────────────────────────.</span>
-<span id="L546" class="LineNr"> 546 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L547" class="LineNr"> 547 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L548" class="LineNr"> 548 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L539" class="LineNr"> 539 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L540" class="LineNr"> 540 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L541" class="LineNr"> 541 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎─────────────────────────────────────────────────.</span>
+<span id="L542" class="LineNr"> 542 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎0   edit          copy            delete         .</span>
+<span id="L543" class="LineNr"> 543 </span>  <span class="Conceal">¦</span><span class="Constant"> .  z:num &lt;- add 2, 2                               ╎foo                                              .</span>
+<span id="L544" class="LineNr"> 544 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply z                                         ╎4                                                .</span>
+<span id="L545" class="LineNr"> 545 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎─────────────────────────────────────────────────.</span>
+<span id="L546" class="LineNr"> 546 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L547" class="LineNr"> 547 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L548" class="LineNr"> 548 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L549" class="LineNr"> 549 </span>  ]
 <span id="L550" class="LineNr"> 550 </span>  <span class="Comment"># make a change (incrementing one of the args to 'add'), then rerun</span>
 <span id="L551" class="LineNr"> 551 </span>  assume-console [
-<span id="L552" class="LineNr"> 552 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 28</span>  <span class="Comment"># one past the value of the second arg</span>
-<span id="L553" class="LineNr"> 553 </span>    press backspace
-<span id="L554" class="LineNr"> 554 </span>    type <span class="Constant">[3]</span>
-<span id="L555" class="LineNr"> 555 </span>    press F4
+<span id="L552" class="LineNr"> 552 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 4</span>,<span class="Constant"> 28</span>  <span class="Comment"># one past the value of the second arg</span>
+<span id="L553" class="LineNr"> 553 </span>  <span class="Conceal">¦</span> press backspace
+<span id="L554" class="LineNr"> 554 </span>  <span class="Conceal">¦</span> type <span class="Constant">[3]</span>
+<span id="L555" class="LineNr"> 555 </span>  <span class="Conceal">¦</span> press F4
 <span id="L556" class="LineNr"> 556 </span>  ]
 <span id="L557" class="LineNr"> 557 </span>  run [
-<span id="L558" class="LineNr"> 558 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L558" class="LineNr"> 558 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L559" class="LineNr"> 559 </span>  ]
 <span id="L560" class="LineNr"> 560 </span>  <span class="Comment"># check that screen updates the result on the right</span>
 <span id="L561" class="LineNr"> 561 </span>  screen-should-contain [
-<span id="L562" class="LineNr"> 562 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L563" class="LineNr"> 563 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L564" class="LineNr"> 564 </span>   <span class="Constant"> .recipe foo [                                      ╎─────────────────────────────────────────────────.</span>
-<span id="L565" class="LineNr"> 565 </span>   <span class="Constant"> .  local-scope                                     ╎0   edit          copy            delete         .</span>
-<span id="L566" class="LineNr"> 566 </span>   <span class="Constant"> .  z:num &lt;- add 2, 3                               ╎foo                                              .</span>
-<span id="L567" class="LineNr"> 567 </span>   <span class="Constant"> .  reply z                                         ╎5                                                .</span>
-<span id="L568" class="LineNr"> 568 </span>   <span class="Constant"> .]                                                 ╎─────────────────────────────────────────────────.</span>
-<span id="L569" class="LineNr"> 569 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L570" class="LineNr"> 570 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L571" class="LineNr"> 571 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L562" class="LineNr"> 562 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L563" class="LineNr"> 563 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L564" class="LineNr"> 564 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎─────────────────────────────────────────────────.</span>
+<span id="L565" class="LineNr"> 565 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎0   edit          copy            delete         .</span>
+<span id="L566" class="LineNr"> 566 </span>  <span class="Conceal">¦</span><span class="Constant"> .  z:num &lt;- add 2, 3                               ╎foo                                              .</span>
+<span id="L567" class="LineNr"> 567 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply z                                         ╎5                                                .</span>
+<span id="L568" class="LineNr"> 568 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎─────────────────────────────────────────────────.</span>
+<span id="L569" class="LineNr"> 569 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L570" class="LineNr"> 570 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L571" class="LineNr"> 571 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L572" class="LineNr"> 572 </span>  ]
 <span id="L573" class="LineNr"> 573 </span>]
 <span id="L574" class="LineNr"> 574 </span>
@@ -644,26 +645,26 @@ if ('onhashchange' in window) {
 <span id="L583" class="LineNr"> 583 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[print <a href='../081print.mu.html#L4'>screen</a>, 4]</span>  <span class="Comment"># contents of sandbox editor</span>
 <span id="L584" class="LineNr"> 584 </span>  <span class="Comment"># run the code in the editor</span>
 <span id="L585" class="LineNr"> 585 </span>  assume-console [
-<span id="L586" class="LineNr"> 586 </span>    press F4
+<span id="L586" class="LineNr"> 586 </span>  <span class="Conceal">¦</span> press F4
 <span id="L587" class="LineNr"> 587 </span>  ]
 <span id="L588" class="LineNr"> 588 </span>  run [
-<span id="L589" class="LineNr"> 589 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L589" class="LineNr"> 589 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L590" class="LineNr"> 590 </span>  ]
 <span id="L591" class="LineNr"> 591 </span>  <span class="Comment"># check that it prints a little toy screen</span>
 <span id="L592" class="LineNr"> 592 </span>  screen-should-contain [
-<span id="L593" class="LineNr"> 593 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L594" class="LineNr"> 594 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L595" class="LineNr"> 595 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L596" class="LineNr"> 596 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L597" class="LineNr"> 597 </span>   <span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L4'>screen</a>, 4                                  .</span>
-<span id="L598" class="LineNr"> 598 </span>   <span class="Constant"> .                                                  ╎screen:                                          .</span>
-<span id="L599" class="LineNr"> 599 </span>   <span class="Constant"> .                                                  ╎  .4                             .               .</span>
-<span id="L600" class="LineNr"> 600 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L601" class="LineNr"> 601 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L602" class="LineNr"> 602 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L603" class="LineNr"> 603 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L604" class="LineNr"> 604 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L605" class="LineNr"> 605 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L593" class="LineNr"> 593 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L594" class="LineNr"> 594 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L595" class="LineNr"> 595 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L596" class="LineNr"> 596 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L597" class="LineNr"> 597 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L4'>screen</a>, 4                                  .</span>
+<span id="L598" class="LineNr"> 598 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎screen:                                          .</span>
+<span id="L599" class="LineNr"> 599 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .4                             .               .</span>
+<span id="L600" class="LineNr"> 600 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L601" class="LineNr"> 601 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L602" class="LineNr"> 602 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L603" class="LineNr"> 603 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L604" class="LineNr"> 604 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L605" class="LineNr"> 605 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L606" class="LineNr"> 606 </span>  ]
 <span id="L607" class="LineNr"> 607 </span>]
 <span id="L608" class="LineNr"> 608 </span>
@@ -677,11 +678,11 @@ if ('onhashchange' in window) {
 <span id="L616" class="LineNr"> 616 </span>  curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
 <span id="L617" class="LineNr"> 617 </span>  <span class="muControl">return-unless</span> curr,<span class="Constant"> 0</span>
 <span id="L618" class="LineNr"> 618 </span>  <span class="Delimiter">{</span>
-<span id="L619" class="LineNr"> 619 </span>    <span class="muControl">break-unless</span> curr
-<span id="L620" class="LineNr"> 620 </span>    c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L621" class="LineNr"> 621 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L622" class="LineNr"> 622 </span>    curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L623" class="LineNr"> 623 </span>    <span class="muControl">loop</span>
+<span id="L619" class="LineNr"> 619 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L620" class="LineNr"> 620 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L621" class="LineNr"> 621 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L622" class="LineNr"> 622 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L623" class="LineNr"> 623 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L624" class="LineNr"> 624 </span>  <span class="Delimiter">}</span>
 <span id="L625" class="LineNr"> 625 </span>  result <span class="Special">&lt;-</span> <a href='../061text.mu.html#L329'>buffer-to-array</a> buf
 <span id="L626" class="LineNr"> 626 </span>]
@@ -691,16 +692,16 @@ if ('onhashchange' in window) {
 <span id="L630" class="LineNr"> 630 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
 <span id="L631" class="LineNr"> 631 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L632" class="LineNr"> 632 </span>  assume-console [
-<span id="L633" class="LineNr"> 633 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L634" class="LineNr"> 634 </span>    type <span class="Constant">[def]</span>
+<span id="L633" class="LineNr"> 633 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L634" class="LineNr"> 634 </span>  <span class="Conceal">¦</span> type <span class="Constant">[def]</span>
 <span id="L635" class="LineNr"> 635 </span>  ]
 <span id="L636" class="LineNr"> 636 </span>  run [
-<span id="L637" class="LineNr"> 637 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L638" class="LineNr"> 638 </span>    s:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L609'>editor-contents</a> e
-<span id="L639" class="LineNr"> 639 </span>    1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s
+<span id="L637" class="LineNr"> 637 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L638" class="LineNr"> 638 </span>  <span class="Conceal">¦</span> s:text <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L609'>editor-contents</a> e
+<span id="L639" class="LineNr"> 639 </span>  <span class="Conceal">¦</span> 1:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s
 <span id="L640" class="LineNr"> 640 </span>  ]
 <span id="L641" class="LineNr"> 641 </span>  memory-should-contain [
-<span id="L642" class="LineNr"> 642 </span>    1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abdefc]</span>
+<span id="L642" class="LineNr"> 642 </span>  <span class="Conceal">¦</span> 1:array:character <span class="Special">&lt;-</span> <span class="Constant">[abdefc]</span>
 <span id="L643" class="LineNr"> 643 </span>  ]
 <span id="L644" class="LineNr"> 644 </span>]
 <span id="L645" class="LineNr"> 645 </span>
@@ -715,17 +716,17 @@ if ('onhashchange' in window) {
 <span id="L654" class="LineNr"> 654 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[]</span>
 <span id="L655" class="LineNr"> 655 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L656" class="LineNr"> 656 </span>  assume-console [
-<span id="L657" class="LineNr"> 657 </span>    press enter
-<span id="L658" class="LineNr"> 658 </span>    press down-arrow
+<span id="L657" class="LineNr"> 657 </span>  <span class="Conceal">¦</span> press enter
+<span id="L658" class="LineNr"> 658 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L659" class="LineNr"> 659 </span>  ]
 <span id="L660" class="LineNr"> 660 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L661" class="LineNr"> 661 </span>  <span class="Comment"># no scroll</span>
 <span id="L662" class="LineNr"> 662 </span>  screen-should-contain [
-<span id="L663" class="LineNr"> 663 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L664" class="LineNr"> 664 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L665" class="LineNr"> 665 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
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-<span id="L667" class="LineNr"> 667 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L663" class="LineNr"> 663 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L664" class="LineNr"> 664 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L665" class="LineNr"> 665 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L666" class="LineNr"> 666 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L667" class="LineNr"> 667 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L668" class="LineNr"> 668 </span>  ]
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@@ -738,20 +739,20 @@ if ('onhashchange' in window) {
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 <span id="L678" class="LineNr"> 678 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
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-<span id="L681" class="LineNr"> 681 </span>    press up-arrow
-<span id="L682" class="LineNr"> 682 </span>    press down-arrow  <span class="Comment"># while cursor isn't at bottom</span>
+<span id="L680" class="LineNr"> 680 </span>  <span class="Conceal">¦</span> press enter
+<span id="L681" class="LineNr"> 681 </span>  <span class="Conceal">¦</span> press up-arrow
+<span id="L682" class="LineNr"> 682 </span>  <span class="Conceal">¦</span> press down-arrow  <span class="Comment"># while cursor isn't at bottom</span>
 <span id="L683" class="LineNr"> 683 </span>  ]
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 <span id="L686" class="LineNr"> 686 </span>  print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L687" class="LineNr"> 687 </span>  <span class="Comment"># cursor moves back to bottom</span>
 <span id="L688" class="LineNr"> 688 </span>  screen-should-contain [
-<span id="L689" class="LineNr"> 689 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L690" class="LineNr"> 690 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L691" class="LineNr"> 691 </span>   <span class="Constant"> .␣                                                 ╎─────────────────────────────────────────────────.</span>
-<span id="L692" class="LineNr"> 692 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L693" class="LineNr"> 693 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L689" class="LineNr"> 689 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L690" class="LineNr"> 690 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L691" class="LineNr"> 691 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣                                                 ╎─────────────────────────────────────────────────.</span>
+<span id="L692" class="LineNr"> 692 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L693" class="LineNr"> 693 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L694" class="LineNr"> 694 </span>  ]
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@@ -768,36 +769,36 @@ if ('onhashchange' in window) {
 <span id="L707" class="LineNr"> 707 </span>
 <span id="L708" class="LineNr"> 708 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L61'>&lt;global-keypress&gt;</a></span> [
 <span id="L709" class="LineNr"> 709 </span>  <span class="Delimiter">{</span>
-<span id="L710" class="LineNr"> 710 </span>    <span class="muControl">break-if</span> sandbox-in-focus?
-<span id="L711" class="LineNr"> 711 </span>    down-arrow?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65516/down-arrow</span>
-<span id="L712" class="LineNr"> 712 </span>    <span class="muControl">break-unless</span> down-arrow?
-<span id="L713" class="LineNr"> 713 </span>    recipe-editor:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L714" class="LineNr"> 714 </span>    recipe-cursor-row:num <span class="Special">&lt;-</span> get *recipe-editor, <span class="Constant">cursor-row:offset</span>
-<span id="L715" class="LineNr"> 715 </span>    recipe-editor-bottom:num <span class="Special">&lt;-</span> get *recipe-editor, <span class="Constant">bottom:offset</span>
-<span id="L716" class="LineNr"> 716 </span>    at-bottom-of-editor?:bool <span class="Special">&lt;-</span> greater-or-equal recipe-cursor-row, recipe-editor-bottom
-<span id="L717" class="LineNr"> 717 </span>    <span class="muControl">break-unless</span> at-bottom-of-editor?
-<span id="L718" class="LineNr"> 718 </span>    <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a> env, <a href='../081print.mu.html#L4'>screen</a>
-<span id="L719" class="LineNr"> 719 </span>    <span class="muControl">break-if</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>
-<span id="L720" class="LineNr"> 720 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L710" class="LineNr"> 710 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
+<span id="L711" class="LineNr"> 711 </span>  <span class="Conceal">¦</span> down-arrow?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65516/down-arrow</span>
+<span id="L712" class="LineNr"> 712 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> down-arrow?
+<span id="L713" class="LineNr"> 713 </span>  <span class="Conceal">¦</span> recipe-editor:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L714" class="LineNr"> 714 </span>  <span class="Conceal">¦</span> recipe-cursor-row:num <span class="Special">&lt;-</span> get *recipe-editor, <span class="Constant">cursor-row:offset</span>
+<span id="L715" class="LineNr"> 715 </span>  <span class="Conceal">¦</span> recipe-editor-bottom:num <span class="Special">&lt;-</span> get *recipe-editor, <span class="Constant">bottom:offset</span>
+<span id="L716" class="LineNr"> 716 </span>  <span class="Conceal">¦</span> at-bottom-of-editor?:bool <span class="Special">&lt;-</span> greater-or-equal recipe-cursor-row, recipe-editor-bottom
+<span id="L717" class="LineNr"> 717 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-bottom-of-editor?
+<span id="L718" class="LineNr"> 718 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a> env, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L719" class="LineNr"> 719 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>
+<span id="L720" class="LineNr"> 720 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
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-<span id="L725" class="LineNr"> 725 </span>    <span class="muControl">break-unless</span> page-down?
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-<span id="L727" class="LineNr"> 727 </span>    <span class="muControl">break-if</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>
-<span id="L728" class="LineNr"> 728 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L723" class="LineNr"> 723 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
+<span id="L724" class="LineNr"> 724 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
+<span id="L725" class="LineNr"> 725 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-down?
+<span id="L726" class="LineNr"> 726 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a> env, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L727" class="LineNr"> 727 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>
+<span id="L728" class="LineNr"> 728 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L729" class="LineNr"> 729 </span>  <span class="Delimiter">}</span>
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-<span id="L738" class="LineNr"> 738 </span>    <span class="muControl">break-if</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>
-<span id="L739" class="LineNr"> 739 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L734" class="LineNr"> 734 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
+<span id="L735" class="LineNr"> 735 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">6/ctrl-f</span>
+<span id="L736" class="LineNr"> 736 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-down?
+<span id="L737" class="LineNr"> 737 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>:bool <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a> env, <a href='../081print.mu.html#L4'>screen</a>
+<span id="L738" class="LineNr"> 738 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='005-sandbox.mu.html#L743'>more-to-scroll?</a>
+<span id="L739" class="LineNr"> 739 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
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 <span id="L742" class="LineNr"> 742 </span>
@@ -818,21 +819,21 @@ if ('onhashchange' in window) {
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-<span id="L760" class="LineNr"> 760 </span>    <span class="Comment"># add a line</span>
-<span id="L761" class="LineNr"> 761 </span>    press enter
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-<span id="L763" class="LineNr"> 763 </span>    press up-arrow
-<span id="L764" class="LineNr"> 764 </span>    <span class="Comment"># try to scroll</span>
-<span id="L765" class="LineNr"> 765 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>  <span class="Comment"># or ctrl-f</span>
+<span id="L760" class="LineNr"> 760 </span>  <span class="Conceal">¦</span> <span class="Comment"># add a line</span>
+<span id="L761" class="LineNr"> 761 </span>  <span class="Conceal">¦</span> press enter
+<span id="L762" class="LineNr"> 762 </span>  <span class="Conceal">¦</span> <span class="Comment"># cursor back to top line</span>
+<span id="L763" class="LineNr"> 763 </span>  <span class="Conceal">¦</span> press up-arrow
+<span id="L764" class="LineNr"> 764 </span>  <span class="Conceal">¦</span> <span class="Comment"># try to scroll</span>
+<span id="L765" class="LineNr"> 765 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>  <span class="Comment"># or ctrl-f</span>
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 <span id="L768" class="LineNr"> 768 </span>  <span class="Comment"># no scroll, and cursor remains at top line</span>
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-<span id="L770" class="LineNr"> 770 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L771" class="LineNr"> 771 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L772" class="LineNr"> 772 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
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-<span id="L774" class="LineNr"> 774 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L770" class="LineNr"> 770 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L771" class="LineNr"> 771 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L772" class="LineNr"> 772 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L773" class="LineNr"> 773 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L774" class="LineNr"> 774 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
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-<span id="L789" class="LineNr"> 789 </span>    press enter
-<span id="L790" class="LineNr"> 790 </span>    <span class="Comment"># switch to sandbox</span>
-<span id="L791" class="LineNr"> 791 </span>    press ctrl-n
-<span id="L792" class="LineNr"> 792 </span>    <span class="Comment"># move cursor</span>
-<span id="L793" class="LineNr"> 793 </span>    press down-arrow
+<span id="L788" class="LineNr"> 788 </span>  <span class="Conceal">¦</span> <span class="Comment"># add a line</span>
+<span id="L789" class="LineNr"> 789 </span>  <span class="Conceal">¦</span> press enter
+<span id="L790" class="LineNr"> 790 </span>  <span class="Conceal">¦</span> <span class="Comment"># switch to sandbox</span>
+<span id="L791" class="LineNr"> 791 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L792" class="LineNr"> 792 </span>  <span class="Conceal">¦</span> <span class="Comment"># move cursor</span>
+<span id="L793" class="LineNr"> 793 </span>  <span class="Conceal">¦</span> press down-arrow
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 <span id="L799" class="LineNr"> 799 </span>  screen-should-contain [
-<span id="L800" class="LineNr"> 800 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L801" class="LineNr"> 801 </span>   <span class="Constant"> .                                                  ╎ab                                               .</span>
-<span id="L802" class="LineNr"> 802 </span>   <span class="Constant"> .                                                  ╎␣d                                               .</span>
-<span id="L803" class="LineNr"> 803 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L804" class="LineNr"> 804 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L800" class="LineNr"> 800 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L801" class="LineNr"> 801 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎ab                                               .</span>
+<span id="L802" class="LineNr"> 802 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣d                                               .</span>
+<span id="L803" class="LineNr"> 803 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L804" class="LineNr"> 804 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L805" class="LineNr"> 805 </span>  ]
 <span id="L806" class="LineNr"> 806 </span>]
 <span id="L807" class="LineNr"> 807 </span>
@@ -878,108 +879,108 @@ if ('onhashchange' in window) {
 <span id="L817" class="LineNr"> 817 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 2, 2]</span>
 <span id="L818" class="LineNr"> 818 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L819" class="LineNr"> 819 </span>  assume-console [
-<span id="L820" class="LineNr"> 820 </span>    <span class="Comment"># create a sandbox</span>
-<span id="L821" class="LineNr"> 821 </span>    press F4
+<span id="L820" class="LineNr"> 820 </span>  <span class="Conceal">¦</span> <span class="Comment"># create a sandbox</span>
+<span id="L821" class="LineNr"> 821 </span>  <span class="Conceal">¦</span> press F4
 <span id="L822" class="LineNr"> 822 </span>  ]
 <span id="L823" class="LineNr"> 823 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L824" class="LineNr"> 824 </span>  screen-should-contain [
-<span id="L825" class="LineNr"> 825 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L826" class="LineNr"> 826 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L827" class="LineNr"> 827 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L828" class="LineNr"> 828 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L829" class="LineNr"> 829 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L825" class="LineNr"> 825 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L826" class="LineNr"> 826 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L827" class="LineNr"> 827 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L828" class="LineNr"> 828 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L829" class="LineNr"> 829 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
 <span id="L830" class="LineNr"> 830 </span>  ]
 <span id="L831" class="LineNr"> 831 </span>  <span class="Comment"># switch to sandbox window and hit 'page-down'</span>
 <span id="L832" class="LineNr"> 832 </span>  assume-console [
-<span id="L833" class="LineNr"> 833 </span>    press ctrl-n
-<span id="L834" class="LineNr"> 834 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L833" class="LineNr"> 833 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L834" class="LineNr"> 834 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L835" class="LineNr"> 835 </span>  ]
 <span id="L836" class="LineNr"> 836 </span>  run [
-<span id="L837" class="LineNr"> 837 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L838" class="LineNr"> 838 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L839" class="LineNr"> 839 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L837" class="LineNr"> 837 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L838" class="LineNr"> 838 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L839" class="LineNr"> 839 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L840" class="LineNr"> 840 </span>  ]
 <span id="L841" class="LineNr"> 841 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
 <span id="L842" class="LineNr"> 842 </span>  <span class="Comment"># cursor moves to first sandbox</span>
 <span id="L843" class="LineNr"> 843 </span>  screen-should-contain [
-<span id="L844" class="LineNr"> 844 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L845" class="LineNr"> 845 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L846" class="LineNr"> 846 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .</span>
-<span id="L847" class="LineNr"> 847 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L848" class="LineNr"> 848 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L844" class="LineNr"> 844 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L845" class="LineNr"> 845 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L846" class="LineNr"> 846 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .</span>
+<span id="L847" class="LineNr"> 847 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L848" class="LineNr"> 848 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L849" class="LineNr"> 849 </span>  ]
 <span id="L850" class="LineNr"> 850 </span>  <span class="Comment"># hit 'page-up'</span>
 <span id="L851" class="LineNr"> 851 </span>  assume-console [
-<span id="L852" class="LineNr"> 852 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L852" class="LineNr"> 852 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L853" class="LineNr"> 853 </span>  ]
 <span id="L854" class="LineNr"> 854 </span>  run [
-<span id="L855" class="LineNr"> 855 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L856" class="LineNr"> 856 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L857" class="LineNr"> 857 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L855" class="LineNr"> 855 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L856" class="LineNr"> 856 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L857" class="LineNr"> 857 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L858" class="LineNr"> 858 </span>  ]
 <span id="L859" class="LineNr"> 859 </span>  <span class="Comment"># sandbox editor displays again, cursor is in editor</span>
 <span id="L860" class="LineNr"> 860 </span>  screen-should-contain [
-<span id="L861" class="LineNr"> 861 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L862" class="LineNr"> 862 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L863" class="LineNr"> 863 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L864" class="LineNr"> 864 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L865" class="LineNr"> 865 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L861" class="LineNr"> 861 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L862" class="LineNr"> 862 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
+<span id="L863" class="LineNr"> 863 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L864" class="LineNr"> 864 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L865" class="LineNr"> 865 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
 <span id="L866" class="LineNr"> 866 </span>  ]
 <span id="L867" class="LineNr"> 867 </span>]
 <span id="L868" class="LineNr"> 868 </span>
 <span id="L869" class="LineNr"> 869 </span><span class="Comment"># page-down on sandbox side updates render-from to scroll sandboxes</span>
 <span id="L870" class="LineNr"> 870 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L61'>&lt;global-keypress&gt;</a></span> [
 <span id="L871" class="LineNr"> 871 </span>  <span class="Delimiter">{</span>
-<span id="L872" class="LineNr"> 872 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L873" class="LineNr"> 873 </span>    page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
-<span id="L874" class="LineNr"> 874 </span>    <span class="muControl">break-unless</span> page-down?
-<span id="L875" class="LineNr"> 875 </span>    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
-<span id="L876" class="LineNr"> 876 </span>    <span class="muControl">break-unless</span> sandbox
-<span id="L877" class="LineNr"> 877 </span>    <span class="Comment"># slide down if possible</span>
-<span id="L878" class="LineNr"> 878 </span>    <span class="Delimiter">{</span>
-<span id="L879" class="LineNr"> 879 </span>      render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
-<span id="L880" class="LineNr"> 880 </span>      number-of-sandboxes:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
-<span id="L881" class="LineNr"> 881 </span>      max:num <span class="Special">&lt;-</span> subtract number-of-sandboxes,<span class="Constant"> 1</span>
-<span id="L882" class="LineNr"> 882 </span>      at-end?:bool <span class="Special">&lt;-</span> greater-or-equal render-from, max
-<span id="L883" class="LineNr"> 883 </span>      <span class="muControl">jump-if</span> at-end?, <span class="Constant">+finish-event</span>  <span class="Comment"># render nothing</span>
-<span id="L884" class="LineNr"> 884 </span>      render-from <span class="Special">&lt;-</span> add render-from,<span class="Constant"> 1</span>
-<span id="L885" class="LineNr"> 885 </span>      *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
-<span id="L886" class="LineNr"> 886 </span>    <span class="Delimiter">}</span>
-<span id="L887" class="LineNr"> 887 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L888" class="LineNr"> 888 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L889" class="LineNr"> 889 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L890" class="LineNr"> 890 </span>    <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L872" class="LineNr"> 872 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L873" class="LineNr"> 873 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
+<span id="L874" class="LineNr"> 874 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-down?
+<span id="L875" class="LineNr"> 875 </span>  <span class="Conceal">¦</span> sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L876" class="LineNr"> 876 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox
+<span id="L877" class="LineNr"> 877 </span>  <span class="Conceal">¦</span> <span class="Comment"># slide down if possible</span>
+<span id="L878" class="LineNr"> 878 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L879" class="LineNr"> 879 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+<span id="L880" class="LineNr"> 880 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> number-of-sandboxes:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
+<span id="L881" class="LineNr"> 881 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> max:num <span class="Special">&lt;-</span> subtract number-of-sandboxes,<span class="Constant"> 1</span>
+<span id="L882" class="LineNr"> 882 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-end?:bool <span class="Special">&lt;-</span> greater-or-equal render-from, max
+<span id="L883" class="LineNr"> 883 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">jump-if</span> at-end?, <span class="Constant">+finish-event</span>  <span class="Comment"># render nothing</span>
+<span id="L884" class="LineNr"> 884 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> render-from <span class="Special">&lt;-</span> add render-from,<span class="Constant"> 1</span>
+<span id="L885" class="LineNr"> 885 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
+<span id="L886" class="LineNr"> 886 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L887" class="LineNr"> 887 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L888" class="LineNr"> 888 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L889" class="LineNr"> 889 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L890" class="LineNr"> 890 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
 <span id="L891" class="LineNr"> 891 </span>  <span class="Delimiter">}</span>
 <span id="L892" class="LineNr"> 892 </span>]
 <span id="L893" class="LineNr"> 893 </span>
 <span id="L894" class="LineNr"> 894 </span><span class="Comment"># update-cursor takes render-from into account</span>
 <span id="L895" class="LineNr"> 895 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L514'>&lt;update-cursor-special-cases&gt;</a></span> [
 <span id="L896" class="LineNr"> 896 </span>  <span class="Delimiter">{</span>
-<span id="L897" class="LineNr"> 897 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L898" class="LineNr"> 898 </span>    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
-<span id="L899" class="LineNr"> 899 </span>    scrolling?:bool <span class="Special">&lt;-</span> greater-or-equal render-from,<span class="Constant"> 0</span>
-<span id="L900" class="LineNr"> 900 </span>    <span class="muControl">break-unless</span> scrolling?
-<span id="L901" class="LineNr"> 901 </span>    cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
-<span id="L902" class="LineNr"> 902 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">2/row</span>, cursor-column  <span class="Comment"># highlighted sandbox will always start at row 2</span>
-<span id="L903" class="LineNr"> 903 </span>    <span class="muControl">return</span>
+<span id="L897" class="LineNr"> 897 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L898" class="LineNr"> 898 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+<span id="L899" class="LineNr"> 899 </span>  <span class="Conceal">¦</span> scrolling?:bool <span class="Special">&lt;-</span> greater-or-equal render-from,<span class="Constant"> 0</span>
+<span id="L900" class="LineNr"> 900 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> scrolling?
+<span id="L901" class="LineNr"> 901 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+<span id="L902" class="LineNr"> 902 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">2/row</span>, cursor-column  <span class="Comment"># highlighted sandbox will always start at row 2</span>
+<span id="L903" class="LineNr"> 903 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L904" class="LineNr"> 904 </span>  <span class="Delimiter">}</span>
 <span id="L905" class="LineNr"> 905 </span>]
 <span id="L906" class="LineNr"> 906 </span>
 <span id="L907" class="LineNr"> 907 </span><span class="Comment"># 'page-up' on sandbox side is like 'page-down': updates render-from when necessary</span>
 <span id="L908" class="LineNr"> 908 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L61'>&lt;global-keypress&gt;</a></span> [
 <span id="L909" class="LineNr"> 909 </span>  <span class="Delimiter">{</span>
-<span id="L910" class="LineNr"> 910 </span>    <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L911" class="LineNr"> 911 </span>    page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
-<span id="L912" class="LineNr"> 912 </span>    <span class="muControl">break-unless</span> page-up?
-<span id="L913" class="LineNr"> 913 </span>    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
-<span id="L914" class="LineNr"> 914 </span>    at-beginning?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
-<span id="L915" class="LineNr"> 915 </span>    <span class="muControl">break-if</span> at-beginning?
-<span id="L916" class="LineNr"> 916 </span>    render-from <span class="Special">&lt;-</span> subtract render-from,<span class="Constant"> 1</span>
-<span id="L917" class="LineNr"> 917 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
-<span id="L918" class="LineNr"> 918 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L919" class="LineNr"> 919 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L920" class="LineNr"> 920 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L921" class="LineNr"> 921 </span>    <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
+<span id="L910" class="LineNr"> 910 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L911" class="LineNr"> 911 </span>  <span class="Conceal">¦</span> page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
+<span id="L912" class="LineNr"> 912 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-up?
+<span id="L913" class="LineNr"> 913 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+<span id="L914" class="LineNr"> 914 </span>  <span class="Conceal">¦</span> at-beginning?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
+<span id="L915" class="LineNr"> 915 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-beginning?
+<span id="L916" class="LineNr"> 916 </span>  <span class="Conceal">¦</span> render-from <span class="Special">&lt;-</span> subtract render-from,<span class="Constant"> 1</span>
+<span id="L917" class="LineNr"> 917 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
+<span id="L918" class="LineNr"> 918 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L919" class="LineNr"> 919 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L920" class="LineNr"> 920 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L921" class="LineNr"> 921 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
 <span id="L922" class="LineNr"> 922 </span>  <span class="Delimiter">}</span>
 <span id="L923" class="LineNr"> 923 </span>]
 <span id="L924" class="LineNr"> 924 </span>
@@ -992,12 +993,12 @@ if ('onhashchange' in window) {
 <span id="L931" class="LineNr"> 931 </span>  <span class="muControl">return-unless</span> curr, <span class="Constant">0/nil</span>
 <span id="L932" class="LineNr"> 932 </span>  <a href='../065duplex_list.mu.html#L29'>next</a>:&amp;:sandbox <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
 <span id="L933" class="LineNr"> 933 </span>  <span class="Delimiter">{</span>
-<span id="L934" class="LineNr"> 934 </span>    <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>, <span class="Constant">0/nil</span>
-<span id="L935" class="LineNr"> 935 </span>    found?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L29'>next</a>, in
-<span id="L936" class="LineNr"> 936 </span>    <span class="muControl">break-if</span> found?
-<span id="L937" class="LineNr"> 937 </span>    curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L29'>next</a>
-<span id="L938" class="LineNr"> 938 </span>    <a href='../065duplex_list.mu.html#L29'>next</a> <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
-<span id="L939" class="LineNr"> 939 </span>    <span class="muControl">loop</span>
+<span id="L934" class="LineNr"> 934 </span>  <span class="Conceal">¦</span> <span class="muControl">return-unless</span> <a href='../065duplex_list.mu.html#L29'>next</a>, <span class="Constant">0/nil</span>
+<span id="L935" class="LineNr"> 935 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> equal <a href='../065duplex_list.mu.html#L29'>next</a>, in
+<span id="L936" class="LineNr"> 936 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L937" class="LineNr"> 937 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L29'>next</a>
+<span id="L938" class="LineNr"> 938 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L29'>next</a> <span class="Special">&lt;-</span> get *curr, <span class="Constant">next-sandbox:offset</span>
+<span id="L939" class="LineNr"> 939 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L940" class="LineNr"> 940 </span>  <span class="Delimiter">}</span>
 <span id="L941" class="LineNr"> 941 </span>  <span class="muControl">return</span> curr
 <span id="L942" class="LineNr"> 942 </span>]
@@ -1008,33 +1009,33 @@ if ('onhashchange' in window) {
 <span id="L947" class="LineNr"> 947 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
 <span id="L948" class="LineNr"> 948 </span>  <span class="Comment"># initialize sandbox side and create a sandbox</span>
 <span id="L949" class="LineNr"> 949 </span>  assume-resources [
-<span id="L950" class="LineNr"> 950 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L951" class="LineNr"> 951 </span>      <span class="Constant">||</span>  <span class="Comment"># file containing just a newline</span>
-<span id="L952" class="LineNr"> 952 </span>    ]
+<span id="L950" class="LineNr"> 950 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L951" class="LineNr"> 951 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">||</span>  <span class="Comment"># file containing just a newline</span>
+<span id="L952" class="LineNr"> 952 </span>  <span class="Conceal">¦</span> ]
 <span id="L953" class="LineNr"> 953 </span>  ]
 <span id="L954" class="LineNr"> 954 </span>  <span class="Comment"># create a sandbox</span>
 <span id="L955" class="LineNr"> 955 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 2, 2]</span>
 <span id="L956" class="LineNr"> 956 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L957" class="LineNr"> 957 </span>  assume-console [
-<span id="L958" class="LineNr"> 958 </span>    press F4
+<span id="L958" class="LineNr"> 958 </span>  <span class="Conceal">¦</span> press F4
 <span id="L959" class="LineNr"> 959 </span>  ]
 <span id="L960" class="LineNr"> 960 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L961" class="LineNr"> 961 </span>  <span class="Comment"># hit 'down' in recipe editor</span>
 <span id="L962" class="LineNr"> 962 </span>  assume-console [
-<span id="L963" class="LineNr"> 963 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L963" class="LineNr"> 963 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L964" class="LineNr"> 964 </span>  ]
 <span id="L965" class="LineNr"> 965 </span>  run [
-<span id="L966" class="LineNr"> 966 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L967" class="LineNr"> 967 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L968" class="LineNr"> 968 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L966" class="LineNr"> 966 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L967" class="LineNr"> 967 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L968" class="LineNr"> 968 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L969" class="LineNr"> 969 </span>  ]
 <span id="L970" class="LineNr"> 970 </span>  <span class="Comment"># cursor doesn't move when the end is already on-screen</span>
 <span id="L971" class="LineNr"> 971 </span>  screen-should-contain [
-<span id="L972" class="LineNr"> 972 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L973" class="LineNr"> 973 </span>   <span class="Constant"> .␣                                                 ╎                                                 .</span>
-<span id="L974" class="LineNr"> 974 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L975" class="LineNr"> 975 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L976" class="LineNr"> 976 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L972" class="LineNr"> 972 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L973" class="LineNr"> 973 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣                                                 ╎                                                 .</span>
+<span id="L974" class="LineNr"> 974 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L975" class="LineNr"> 975 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L976" class="LineNr"> 976 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
 <span id="L977" class="LineNr"> 977 </span>  ]
 <span id="L978" class="LineNr"> 978 </span>]
 <span id="L979" class="LineNr"> 979 </span>
@@ -1049,145 +1050,145 @@ if ('onhashchange' in window) {
 <span id="L988" class="LineNr"> 988 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L989" class="LineNr"> 989 </span>  <span class="Comment"># create 2 sandboxes</span>
 <span id="L990" class="LineNr"> 990 </span>  assume-console [
-<span id="L991" class="LineNr"> 991 </span>    press ctrl-n
-<span id="L992" class="LineNr"> 992 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L993" class="LineNr"> 993 </span>    press F4
-<span id="L994" class="LineNr"> 994 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L995" class="LineNr"> 995 </span>    press F4
+<span id="L991" class="LineNr"> 991 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L992" class="LineNr"> 992 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L993" class="LineNr"> 993 </span>  <span class="Conceal">¦</span> press F4
+<span id="L994" class="LineNr"> 994 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L995" class="LineNr"> 995 </span>  <span class="Conceal">¦</span> press F4
 <span id="L996" class="LineNr"> 996 </span>  ]
 <span id="L997" class="LineNr"> 997 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L998" class="LineNr"> 998 </span>  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
 <span id="L999" class="LineNr"> 999 </span>  print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L1000" class="LineNr">1000 </span>  screen-should-contain [
-<span id="L1001" class="LineNr">1001 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1002" class="LineNr">1002 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L1003" class="LineNr">1003 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1004" class="LineNr">1004 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1005" class="LineNr">1005 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1006" class="LineNr">1006 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1007" class="LineNr">1007 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1008" class="LineNr">1008 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1009" class="LineNr">1009 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1010" class="LineNr">1010 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1001" class="LineNr">1001 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1002" class="LineNr">1002 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
+<span id="L1003" class="LineNr">1003 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1004" class="LineNr">1004 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1005" class="LineNr">1005 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1006" class="LineNr">1006 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1007" class="LineNr">1007 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1008" class="LineNr">1008 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1009" class="LineNr">1009 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1010" class="LineNr">1010 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L1011" class="LineNr">1011 </span>  ]
 <span id="L1012" class="LineNr">1012 </span>  <span class="Comment"># hit 'page-down'</span>
 <span id="L1013" class="LineNr">1013 </span>  assume-console [
-<span id="L1014" class="LineNr">1014 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1014" class="LineNr">1014 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L1015" class="LineNr">1015 </span>  ]
 <span id="L1016" class="LineNr">1016 </span>  run [
-<span id="L1017" class="LineNr">1017 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L1018" class="LineNr">1018 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1019" class="LineNr">1019 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1017" class="LineNr">1017 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1018" class="LineNr">1018 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1019" class="LineNr">1019 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L1020" class="LineNr">1020 </span>  ]
 <span id="L1021" class="LineNr">1021 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
 <span id="L1022" class="LineNr">1022 </span>  <span class="Comment"># cursor moves to first sandbox</span>
 <span id="L1023" class="LineNr">1023 </span>  screen-should-contain [
-<span id="L1024" class="LineNr">1024 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1025" class="LineNr">1025 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1026" class="LineNr">1026 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .</span>
-<span id="L1027" class="LineNr">1027 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1028" class="LineNr">1028 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1029" class="LineNr">1029 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1030" class="LineNr">1030 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1031" class="LineNr">1031 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1032" class="LineNr">1032 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1024" class="LineNr">1024 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1025" class="LineNr">1025 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1026" class="LineNr">1026 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .</span>
+<span id="L1027" class="LineNr">1027 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1028" class="LineNr">1028 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1029" class="LineNr">1029 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1030" class="LineNr">1030 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1031" class="LineNr">1031 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1032" class="LineNr">1032 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L1033" class="LineNr">1033 </span>  ]
 <span id="L1034" class="LineNr">1034 </span>  <span class="Comment"># hit 'page-down' again</span>
 <span id="L1035" class="LineNr">1035 </span>  assume-console [
-<span id="L1036" class="LineNr">1036 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1036" class="LineNr">1036 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L1037" class="LineNr">1037 </span>  ]
 <span id="L1038" class="LineNr">1038 </span>  run [
-<span id="L1039" class="LineNr">1039 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1039" class="LineNr">1039 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1040" class="LineNr">1040 </span>  ]
 <span id="L1041" class="LineNr">1041 </span>  <span class="Comment"># just second sandbox displayed</span>
 <span id="L1042" class="LineNr">1042 </span>  screen-should-contain [
-<span id="L1043" class="LineNr">1043 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1044" class="LineNr">1044 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1045" class="LineNr">1045 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L1046" class="LineNr">1046 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1047" class="LineNr">1047 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1048" class="LineNr">1048 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1049" class="LineNr">1049 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1043" class="LineNr">1043 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1044" class="LineNr">1044 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1045" class="LineNr">1045 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L1046" class="LineNr">1046 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1047" class="LineNr">1047 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1048" class="LineNr">1048 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1049" class="LineNr">1049 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L1050" class="LineNr">1050 </span>  ]
 <span id="L1051" class="LineNr">1051 </span>  <span class="Comment"># hit 'page-down' again</span>
 <span id="L1052" class="LineNr">1052 </span>  assume-console [
-<span id="L1053" class="LineNr">1053 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1053" class="LineNr">1053 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L1054" class="LineNr">1054 </span>  ]
 <span id="L1055" class="LineNr">1055 </span>  run [
-<span id="L1056" class="LineNr">1056 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1056" class="LineNr">1056 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1057" class="LineNr">1057 </span>  ]
 <span id="L1058" class="LineNr">1058 </span>  <span class="Comment"># no change</span>
 <span id="L1059" class="LineNr">1059 </span>  screen-should-contain [
-<span id="L1060" class="LineNr">1060 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1061" class="LineNr">1061 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1062" class="LineNr">1062 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L1063" class="LineNr">1063 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1064" class="LineNr">1064 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1065" class="LineNr">1065 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1066" class="LineNr">1066 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1060" class="LineNr">1060 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1061" class="LineNr">1061 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1062" class="LineNr">1062 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L1063" class="LineNr">1063 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1064" class="LineNr">1064 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1065" class="LineNr">1065 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1066" class="LineNr">1066 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L1067" class="LineNr">1067 </span>  ]
 <span id="L1068" class="LineNr">1068 </span>  <span class="Comment"># hit 'page-up'</span>
 <span id="L1069" class="LineNr">1069 </span>  assume-console [
-<span id="L1070" class="LineNr">1070 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1070" class="LineNr">1070 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L1071" class="LineNr">1071 </span>  ]
 <span id="L1072" class="LineNr">1072 </span>  run [
-<span id="L1073" class="LineNr">1073 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1073" class="LineNr">1073 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1074" class="LineNr">1074 </span>  ]
 <span id="L1075" class="LineNr">1075 </span>  <span class="Comment"># back to displaying both sandboxes without editor</span>
 <span id="L1076" class="LineNr">1076 </span>  screen-should-contain [
-<span id="L1077" class="LineNr">1077 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1078" class="LineNr">1078 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1079" class="LineNr">1079 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1080" class="LineNr">1080 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1081" class="LineNr">1081 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1082" class="LineNr">1082 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1083" class="LineNr">1083 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1084" class="LineNr">1084 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1085" class="LineNr">1085 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1077" class="LineNr">1077 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1078" class="LineNr">1078 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1079" class="LineNr">1079 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1080" class="LineNr">1080 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1081" class="LineNr">1081 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1082" class="LineNr">1082 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1083" class="LineNr">1083 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1084" class="LineNr">1084 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1085" class="LineNr">1085 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L1086" class="LineNr">1086 </span>  ]
 <span id="L1087" class="LineNr">1087 </span>  <span class="Comment"># hit 'page-up' again</span>
 <span id="L1088" class="LineNr">1088 </span>  assume-console [
-<span id="L1089" class="LineNr">1089 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1089" class="LineNr">1089 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L1090" class="LineNr">1090 </span>  ]
 <span id="L1091" class="LineNr">1091 </span>  run [
-<span id="L1092" class="LineNr">1092 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L1093" class="LineNr">1093 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1094" class="LineNr">1094 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1092" class="LineNr">1092 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1093" class="LineNr">1093 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1094" class="LineNr">1094 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L1095" class="LineNr">1095 </span>  ]
 <span id="L1096" class="LineNr">1096 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
 <span id="L1097" class="LineNr">1097 </span>  screen-should-contain [
-<span id="L1098" class="LineNr">1098 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1099" class="LineNr">1099 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L1100" class="LineNr">1100 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1101" class="LineNr">1101 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1102" class="LineNr">1102 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1103" class="LineNr">1103 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1104" class="LineNr">1104 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1105" class="LineNr">1105 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1106" class="LineNr">1106 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1107" class="LineNr">1107 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1098" class="LineNr">1098 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1099" class="LineNr">1099 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
+<span id="L1100" class="LineNr">1100 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1101" class="LineNr">1101 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1102" class="LineNr">1102 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1103" class="LineNr">1103 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1104" class="LineNr">1104 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1105" class="LineNr">1105 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1106" class="LineNr">1106 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1107" class="LineNr">1107 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L1108" class="LineNr">1108 </span>  ]
 <span id="L1109" class="LineNr">1109 </span>  <span class="Comment"># hit 'page-up' again</span>
 <span id="L1110" class="LineNr">1110 </span>  assume-console [
-<span id="L1111" class="LineNr">1111 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1111" class="LineNr">1111 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L1112" class="LineNr">1112 </span>  ]
 <span id="L1113" class="LineNr">1113 </span>  run [
-<span id="L1114" class="LineNr">1114 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L1115" class="LineNr">1115 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1116" class="LineNr">1116 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1114" class="LineNr">1114 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1115" class="LineNr">1115 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1116" class="LineNr">1116 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L1117" class="LineNr">1117 </span>  ]
 <span id="L1118" class="LineNr">1118 </span>  <span class="Comment"># no change</span>
 <span id="L1119" class="LineNr">1119 </span>  screen-should-contain [
-<span id="L1120" class="LineNr">1120 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1121" class="LineNr">1121 </span>   <span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L1122" class="LineNr">1122 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1123" class="LineNr">1123 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1124" class="LineNr">1124 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1125" class="LineNr">1125 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1126" class="LineNr">1126 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1127" class="LineNr">1127 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1128" class="LineNr">1128 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1129" class="LineNr">1129 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1120" class="LineNr">1120 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1121" class="LineNr">1121 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
+<span id="L1122" class="LineNr">1122 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1123" class="LineNr">1123 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1124" class="LineNr">1124 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1125" class="LineNr">1125 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1126" class="LineNr">1126 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1127" class="LineNr">1127 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1128" class="LineNr">1128 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1129" class="LineNr">1129 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L1130" class="LineNr">1130 </span>  ]
 <span id="L1131" class="LineNr">1131 </span>]
 <span id="L1132" class="LineNr">1132 </span>
@@ -1202,74 +1203,74 @@ if ('onhashchange' in window) {
 <span id="L1141" class="LineNr">1141 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L1142" class="LineNr">1142 </span>  <span class="Comment"># create a sandbox</span>
 <span id="L1143" class="LineNr">1143 </span>  assume-console [
-<span id="L1144" class="LineNr">1144 </span>    press ctrl-n
-<span id="L1145" class="LineNr">1145 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L1146" class="LineNr">1146 </span>    press F4
+<span id="L1144" class="LineNr">1144 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L1145" class="LineNr">1145 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L1146" class="LineNr">1146 </span>  <span class="Conceal">¦</span> press F4
 <span id="L1147" class="LineNr">1147 </span>  ]
 <span id="L1148" class="LineNr">1148 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1149" class="LineNr">1149 </span>  screen-should-contain [
-<span id="L1150" class="LineNr">1150 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1151" class="LineNr">1151 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1152" class="LineNr">1152 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1153" class="LineNr">1153 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1154" class="LineNr">1154 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1155" class="LineNr">1155 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1156" class="LineNr">1156 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1157" class="LineNr">1157 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1150" class="LineNr">1150 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1151" class="LineNr">1151 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1152" class="LineNr">1152 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1153" class="LineNr">1153 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1154" class="LineNr">1154 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1155" class="LineNr">1155 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1156" class="LineNr">1156 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1157" class="LineNr">1157 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L1158" class="LineNr">1158 </span>  ]
 <span id="L1159" class="LineNr">1159 </span>  <span class="Comment"># hit 'page-down' and 'page-up' a couple of times. sandbox index should be stable</span>
 <span id="L1160" class="LineNr">1160 </span>  assume-console [
-<span id="L1161" class="LineNr">1161 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1161" class="LineNr">1161 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L1162" class="LineNr">1162 </span>  ]
 <span id="L1163" class="LineNr">1163 </span>  run [
-<span id="L1164" class="LineNr">1164 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1164" class="LineNr">1164 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1165" class="LineNr">1165 </span>  ]
 <span id="L1166" class="LineNr">1166 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
 <span id="L1167" class="LineNr">1167 </span>  <span class="Comment"># cursor moves to first sandbox</span>
 <span id="L1168" class="LineNr">1168 </span>  screen-should-contain [
-<span id="L1169" class="LineNr">1169 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1170" class="LineNr">1170 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1171" class="LineNr">1171 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1172" class="LineNr">1172 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1173" class="LineNr">1173 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1174" class="LineNr">1174 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1175" class="LineNr">1175 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1169" class="LineNr">1169 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1170" class="LineNr">1170 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1171" class="LineNr">1171 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1172" class="LineNr">1172 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1173" class="LineNr">1173 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1174" class="LineNr">1174 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1175" class="LineNr">1175 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L1176" class="LineNr">1176 </span>  ]
 <span id="L1177" class="LineNr">1177 </span>  <span class="Comment"># hit 'page-up' again</span>
 <span id="L1178" class="LineNr">1178 </span>  assume-console [
-<span id="L1179" class="LineNr">1179 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1179" class="LineNr">1179 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L1180" class="LineNr">1180 </span>  ]
 <span id="L1181" class="LineNr">1181 </span>  run [
-<span id="L1182" class="LineNr">1182 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1182" class="LineNr">1182 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1183" class="LineNr">1183 </span>  ]
 <span id="L1184" class="LineNr">1184 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
 <span id="L1185" class="LineNr">1185 </span>  screen-should-contain [
-<span id="L1186" class="LineNr">1186 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1187" class="LineNr">1187 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1188" class="LineNr">1188 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1189" class="LineNr">1189 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1190" class="LineNr">1190 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1191" class="LineNr">1191 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1192" class="LineNr">1192 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1193" class="LineNr">1193 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1186" class="LineNr">1186 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1187" class="LineNr">1187 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1188" class="LineNr">1188 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1189" class="LineNr">1189 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1190" class="LineNr">1190 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1191" class="LineNr">1191 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1192" class="LineNr">1192 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1193" class="LineNr">1193 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L1194" class="LineNr">1194 </span>  ]
 <span id="L1195" class="LineNr">1195 </span>  <span class="Comment"># hit 'page-down'</span>
 <span id="L1196" class="LineNr">1196 </span>  assume-console [
-<span id="L1197" class="LineNr">1197 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1197" class="LineNr">1197 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L1198" class="LineNr">1198 </span>  ]
 <span id="L1199" class="LineNr">1199 </span>  run [
-<span id="L1200" class="LineNr">1200 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L1200" class="LineNr">1200 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L1201" class="LineNr">1201 </span>  ]
 <span id="L1202" class="LineNr">1202 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
 <span id="L1203" class="LineNr">1203 </span>  <span class="Comment"># cursor moves to first sandbox</span>
 <span id="L1204" class="LineNr">1204 </span>  screen-should-contain [
-<span id="L1205" class="LineNr">1205 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1206" class="LineNr">1206 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1207" class="LineNr">1207 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1208" class="LineNr">1208 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1209" class="LineNr">1209 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1210" class="LineNr">1210 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1211" class="LineNr">1211 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1205" class="LineNr">1205 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1206" class="LineNr">1206 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1207" class="LineNr">1207 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1208" class="LineNr">1208 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1209" class="LineNr">1209 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1210" class="LineNr">1210 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1211" class="LineNr">1211 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L1212" class="LineNr">1212 </span>  ]
 <span id="L1213" class="LineNr">1213 </span>]
 </pre>
diff --git a/html/edit/006-sandbox-copy.mu.html b/html/edit/006-sandbox-copy.mu.html
index b5c5bb85..3ece6b06 100644
--- a/html/edit/006-sandbox-copy.mu.html
+++ b/html/edit/006-sandbox-copy.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -71,53 +72,53 @@ if ('onhashchange' in window) {
 <span id="L11" class="LineNr"> 11 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 1, 1]</span>  <span class="Comment"># contents of sandbox editor</span>
 <span id="L12" class="LineNr"> 12 </span>  <span class="Comment"># run it</span>
 <span id="L13" class="LineNr"> 13 </span>  assume-console [
-<span id="L14" class="LineNr"> 14 </span>    press F4
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span> press F4
 <span id="L15" class="LineNr"> 15 </span>  ]
 <span id="L16" class="LineNr"> 16 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L17" class="LineNr"> 17 </span>  screen-should-contain [
-<span id="L18" class="LineNr"> 18 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L19" class="LineNr"> 19 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L20" class="LineNr"> 20 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L21" class="LineNr"> 21 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L22" class="LineNr"> 22 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L20" class="LineNr"> 20 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L26" class="LineNr"> 26 </span>  ]
 <span id="L27" class="LineNr"> 27 </span>  <span class="Comment"># click at left edge of 'copy' button</span>
 <span id="L28" class="LineNr"> 28 </span>  assume-console [
-<span id="L29" class="LineNr"> 29 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 69</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 69</span>
 <span id="L30" class="LineNr"> 30 </span>  ]
 <span id="L31" class="LineNr"> 31 </span>  run [
-<span id="L32" class="LineNr"> 32 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L33" class="LineNr"> 33 </span>  ]
 <span id="L34" class="LineNr"> 34 </span>  <span class="Comment"># it copies into editor</span>
 <span id="L35" class="LineNr"> 35 </span>  screen-should-contain [
-<span id="L36" class="LineNr"> 36 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L37" class="LineNr"> 37 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L38" class="LineNr"> 38 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L39" class="LineNr"> 39 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L40" class="LineNr"> 40 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L41" class="LineNr"> 41 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L38" class="LineNr"> 38 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L44" class="LineNr"> 44 </span>  ]
 <span id="L45" class="LineNr"> 45 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L46" class="LineNr"> 46 </span>  assume-console [
-<span id="L47" class="LineNr"> 47 </span>    type <span class="Constant">[0]</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L48" class="LineNr"> 48 </span>  ]
 <span id="L49" class="LineNr"> 49 </span>  run [
-<span id="L50" class="LineNr"> 50 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L51" class="LineNr"> 51 </span>  ]
 <span id="L52" class="LineNr"> 52 </span>  screen-should-contain [
-<span id="L53" class="LineNr"> 53 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L54" class="LineNr"> 54 </span>   <span class="Constant"> .                                                  ╎0add 1, 1                                        .</span>
-<span id="L55" class="LineNr"> 55 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L56" class="LineNr"> 56 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L57" class="LineNr"> 57 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L58" class="LineNr"> 58 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L59" class="LineNr"> 59 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L60" class="LineNr"> 60 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0add 1, 1                                        .</span>
+<span id="L55" class="LineNr"> 55 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L61" class="LineNr"> 61 </span>  ]
 <span id="L62" class="LineNr"> 62 </span>]
 <span id="L63" class="LineNr"> 63 </span>
@@ -131,68 +132,68 @@ if ('onhashchange' in window) {
 <span id="L71" class="LineNr"> 71 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 1, 1]</span>  <span class="Comment"># contents of sandbox editor</span>
 <span id="L72" class="LineNr"> 72 </span>  <span class="Comment"># run it</span>
 <span id="L73" class="LineNr"> 73 </span>  assume-console [
-<span id="L74" class="LineNr"> 74 </span>    press F4
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> press F4
 <span id="L75" class="LineNr"> 75 </span>  ]
 <span id="L76" class="LineNr"> 76 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L77" class="LineNr"> 77 </span>  screen-should-contain [
-<span id="L78" class="LineNr"> 78 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L79" class="LineNr"> 79 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L80" class="LineNr"> 80 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L81" class="LineNr"> 81 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L82" class="LineNr"> 82 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L83" class="LineNr"> 83 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L84" class="LineNr"> 84 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L85" class="LineNr"> 85 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L80" class="LineNr"> 80 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L86" class="LineNr"> 86 </span>  ]
 <span id="L87" class="LineNr"> 87 </span>  <span class="Comment"># click at right edge of 'copy' button (just before 'delete')</span>
 <span id="L88" class="LineNr"> 88 </span>  assume-console [
-<span id="L89" class="LineNr"> 89 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 84</span>
+<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 84</span>
 <span id="L90" class="LineNr"> 90 </span>  ]
 <span id="L91" class="LineNr"> 91 </span>  run [
-<span id="L92" class="LineNr"> 92 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L93" class="LineNr"> 93 </span>  ]
 <span id="L94" class="LineNr"> 94 </span>  <span class="Comment"># it copies into editor</span>
 <span id="L95" class="LineNr"> 95 </span>  screen-should-contain [
-<span id="L96" class="LineNr"> 96 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L97" class="LineNr"> 97 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L98" class="LineNr"> 98 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L99" class="LineNr"> 99 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L100" class="LineNr">100 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L101" class="LineNr">101 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L102" class="LineNr">102 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L103" class="LineNr">103 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L98" class="LineNr"> 98 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L104" class="LineNr">104 </span>  ]
 <span id="L105" class="LineNr">105 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L106" class="LineNr">106 </span>  assume-console [
-<span id="L107" class="LineNr">107 </span>    type <span class="Constant">[0]</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L108" class="LineNr">108 </span>  ]
 <span id="L109" class="LineNr">109 </span>  run [
-<span id="L110" class="LineNr">110 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L111" class="LineNr">111 </span>  ]
 <span id="L112" class="LineNr">112 </span>  screen-should-contain [
-<span id="L113" class="LineNr">113 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L114" class="LineNr">114 </span>   <span class="Constant"> .                                                  ╎0add 1, 1                                        .</span>
-<span id="L115" class="LineNr">115 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L116" class="LineNr">116 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L117" class="LineNr">117 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L118" class="LineNr">118 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L119" class="LineNr">119 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L120" class="LineNr">120 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0add 1, 1                                        .</span>
+<span id="L115" class="LineNr">115 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L121" class="LineNr">121 </span>  ]
 <span id="L122" class="LineNr">122 </span>]
 <span id="L123" class="LineNr">123 </span>
 <span id="L124" class="LineNr">124 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span> [
 <span id="L125" class="LineNr">125 </span>  <span class="Comment"># support 'copy' button</span>
 <span id="L126" class="LineNr">126 </span>  <span class="Delimiter">{</span>
-<span id="L127" class="LineNr">127 </span>    copy?:bool <span class="Special">&lt;-</span> <a href='006-sandbox-copy.mu.html#L140'>should-attempt-copy?</a> click-row, click-column, env
-<span id="L128" class="LineNr">128 </span>    <span class="muControl">break-unless</span> copy?
-<span id="L129" class="LineNr">129 </span>    copy?, env <span class="Special">&lt;-</span> <a href='006-sandbox-copy.mu.html#L159'>try-copy-sandbox</a> click-row, env
-<span id="L130" class="LineNr">130 </span>    <span class="muControl">break-unless</span> copy?
-<span id="L131" class="LineNr">131 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L132" class="LineNr">132 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L133" class="LineNr">133 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L134" class="LineNr">134 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L135" class="LineNr">135 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> copy?:bool <span class="Special">&lt;-</span> <a href='006-sandbox-copy.mu.html#L140'>should-attempt-copy?</a> click-row, click-column, env
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> copy?
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> copy?, env <span class="Special">&lt;-</span> <a href='006-sandbox-copy.mu.html#L159'>try-copy-sandbox</a> click-row, env
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> copy?
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L136" class="LineNr">136 </span>  <span class="Delimiter">}</span>
 <span id="L137" class="LineNr">137 </span>]
 <span id="L138" class="LineNr">138 </span>
@@ -237,12 +238,12 @@ if ('onhashchange' in window) {
 <span id="L177" class="LineNr">177 </span>  <span class="Constant">load-ingredients</span>
 <span id="L178" class="LineNr">178 </span>  curr-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
 <span id="L179" class="LineNr">179 </span>  <span class="Delimiter">{</span>
-<span id="L180" class="LineNr">180 </span>    <span class="muControl">break-unless</span> curr-sandbox
-<span id="L181" class="LineNr">181 </span>    start:num <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<span id="L182" class="LineNr">182 </span>    found?:bool <span class="Special">&lt;-</span> equal click-row, start
-<span id="L183" class="LineNr">183 </span>    <span class="muControl">return-if</span> found?, curr-sandbox
-<span id="L184" class="LineNr">184 </span>    curr-sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L185" class="LineNr">185 </span>    <span class="muControl">loop</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr-sandbox
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> start:num <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> equal click-row, start
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> found?, curr-sandbox
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> curr-sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L186" class="LineNr">186 </span>  <span class="Delimiter">}</span>
 <span id="L187" class="LineNr">187 </span>  <span class="muControl">return</span> <span class="Constant">0/not-found</span>
 <span id="L188" class="LineNr">188 </span>]
@@ -286,55 +287,55 @@ if ('onhashchange' in window) {
 <span id="L226" class="LineNr">226 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 1, 1]</span>  <span class="Comment"># contents of sandbox editor</span>
 <span id="L227" class="LineNr">227 </span>  <span class="Comment"># run it</span>
 <span id="L228" class="LineNr">228 </span>  assume-console [
-<span id="L229" class="LineNr">229 </span>    press F4
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> press F4
 <span id="L230" class="LineNr">230 </span>  ]
 <span id="L231" class="LineNr">231 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L232" class="LineNr">232 </span>  screen-should-contain [
-<span id="L233" class="LineNr">233 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L234" class="LineNr">234 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L235" class="LineNr">235 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L236" class="LineNr">236 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L237" class="LineNr">237 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L238" class="LineNr">238 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L239" class="LineNr">239 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L240" class="LineNr">240 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L235" class="LineNr">235 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L241" class="LineNr">241 </span>  ]
 <span id="L242" class="LineNr">242 </span>  <span class="Comment"># type something into the sandbox editor, then click on the 'copy' button</span>
 <span id="L243" class="LineNr">243 </span>  assume-console [
-<span id="L244" class="LineNr">244 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 70</span>  <span class="Comment"># put cursor in sandbox editor</span>
-<span id="L245" class="LineNr">245 </span>    type <span class="Constant">[0]</span>  <span class="Comment"># type something</span>
-<span id="L246" class="LineNr">246 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 70</span>  <span class="Comment"># click 'copy' button</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 70</span>  <span class="Comment"># put cursor in sandbox editor</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>  <span class="Comment"># type something</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 70</span>  <span class="Comment"># click 'copy' button</span>
 <span id="L247" class="LineNr">247 </span>  ]
 <span id="L248" class="LineNr">248 </span>  run [
-<span id="L249" class="LineNr">249 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L250" class="LineNr">250 </span>  ]
 <span id="L251" class="LineNr">251 </span>  <span class="Comment"># copy doesn't happen</span>
 <span id="L252" class="LineNr">252 </span>  screen-should-contain [
-<span id="L253" class="LineNr">253 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L254" class="LineNr">254 </span>   <span class="Constant"> .                                                  ╎0                                                .</span>
-<span id="L255" class="LineNr">255 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L256" class="LineNr">256 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L257" class="LineNr">257 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L258" class="LineNr">258 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L259" class="LineNr">259 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L260" class="LineNr">260 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0                                                .</span>
+<span id="L255" class="LineNr">255 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L261" class="LineNr">261 </span>  ]
 <span id="L262" class="LineNr">262 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L263" class="LineNr">263 </span>  assume-console [
-<span id="L264" class="LineNr">264 </span>    type <span class="Constant">[1]</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L265" class="LineNr">265 </span>  ]
 <span id="L266" class="LineNr">266 </span>  run [
-<span id="L267" class="LineNr">267 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L268" class="LineNr">268 </span>  ]
 <span id="L269" class="LineNr">269 </span>  screen-should-contain [
-<span id="L270" class="LineNr">270 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L271" class="LineNr">271 </span>   <span class="Constant"> .                                                  ╎01                                               .</span>
-<span id="L272" class="LineNr">272 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L273" class="LineNr">273 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L274" class="LineNr">274 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L275" class="LineNr">275 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L276" class="LineNr">276 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L277" class="LineNr">277 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎01                                               .</span>
+<span id="L272" class="LineNr">272 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L275" class="LineNr">275 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L278" class="LineNr">278 </span>  ]
 <span id="L279" class="LineNr">279 </span>]
 </pre>
diff --git a/html/edit/007-sandbox-delete.mu.html b/html/edit/007-sandbox-delete.mu.html
index f8292598..f9371d93 100644
--- a/html/edit/007-sandbox-delete.mu.html
+++ b/html/edit/007-sandbox-delete.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -69,74 +70,74 @@ if ('onhashchange' in window) {
 <span id="L9" class="LineNr">  9 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[]</span>
 <span id="L10" class="LineNr"> 10 </span>  <span class="Comment"># run a few commands</span>
 <span id="L11" class="LineNr"> 11 </span>  assume-console [
-<span id="L12" class="LineNr"> 12 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 80</span>
-<span id="L13" class="LineNr"> 13 </span>    type <span class="Constant">[divide-with-remainder 11, 3]</span>
-<span id="L14" class="LineNr"> 14 </span>    press F4
-<span id="L15" class="LineNr"> 15 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L16" class="LineNr"> 16 </span>    press F4
+<span id="L12" class="LineNr"> 12 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 80</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> type <span class="Constant">[divide-with-remainder 11, 3]</span>
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span> press F4
+<span id="L15" class="LineNr"> 15 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L16" class="LineNr"> 16 </span>  <span class="Conceal">¦</span> press F4
 <span id="L17" class="LineNr"> 17 </span>  ]
 <span id="L18" class="LineNr"> 18 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L19" class="LineNr"> 19 </span>  screen-should-contain [
-<span id="L20" class="LineNr"> 20 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L21" class="LineNr"> 21 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L22" class="LineNr"> 22 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L27" class="LineNr"> 27 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
-<span id="L29" class="LineNr"> 29 </span>   <span class="Constant"> .                                                  ╎3                                                .</span>
-<span id="L30" class="LineNr"> 30 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L31" class="LineNr"> 31 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L32" class="LineNr"> 32 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L22" class="LineNr"> 22 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎divide-with-remainder 11, 3                      .</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎3                                                .</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L33" class="LineNr"> 33 </span>  ]
 <span id="L34" class="LineNr"> 34 </span>  <span class="Comment"># delete second sandbox by clicking on left edge of 'delete' button</span>
 <span id="L35" class="LineNr"> 35 </span>  assume-console [
-<span id="L36" class="LineNr"> 36 </span>    left-click<span class="Constant"> 7</span>,<span class="Constant"> 85</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 7</span>,<span class="Constant"> 85</span>
 <span id="L37" class="LineNr"> 37 </span>  ]
 <span id="L38" class="LineNr"> 38 </span>  run [
-<span id="L39" class="LineNr"> 39 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L40" class="LineNr"> 40 </span>  ]
 <span id="L41" class="LineNr"> 41 </span>  screen-should-contain [
-<span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L44" class="LineNr"> 44 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L47" class="LineNr"> 47 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L48" class="LineNr"> 48 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L49" class="LineNr"> 49 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L50" class="LineNr"> 50 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L44" class="LineNr"> 44 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L51" class="LineNr"> 51 </span>  ]
 <span id="L52" class="LineNr"> 52 </span>  <span class="Comment"># delete first sandbox by clicking at right edge of 'delete' button</span>
 <span id="L53" class="LineNr"> 53 </span>  assume-console [
-<span id="L54" class="LineNr"> 54 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 99</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 99</span>
 <span id="L55" class="LineNr"> 55 </span>  ]
 <span id="L56" class="LineNr"> 56 </span>  run [
-<span id="L57" class="LineNr"> 57 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L58" class="LineNr"> 58 </span>  ]
 <span id="L59" class="LineNr"> 59 </span>  screen-should-contain [
-<span id="L60" class="LineNr"> 60 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L61" class="LineNr"> 61 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L62" class="LineNr"> 62 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L63" class="LineNr"> 63 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L64" class="LineNr"> 64 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L62" class="LineNr"> 62 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L63" class="LineNr"> 63 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L65" class="LineNr"> 65 </span>  ]
 <span id="L66" class="LineNr"> 66 </span>]
 <span id="L67" class="LineNr"> 67 </span>
 <span id="L68" class="LineNr"> 68 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span> [
 <span id="L69" class="LineNr"> 69 </span>  <span class="Comment"># support 'delete' button</span>
 <span id="L70" class="LineNr"> 70 </span>  <span class="Delimiter">{</span>
-<span id="L71" class="LineNr"> 71 </span>    delete?:bool <span class="Special">&lt;-</span> <a href='007-sandbox-delete.mu.html#L84'>should-attempt-delete?</a> click-row, click-column, env
-<span id="L72" class="LineNr"> 72 </span>    <span class="muControl">break-unless</span> delete?
-<span id="L73" class="LineNr"> 73 </span>    delete?, env <span class="Special">&lt;-</span> <a href='007-sandbox-delete.mu.html#L99'>try-delete-sandbox</a> click-row, env
-<span id="L74" class="LineNr"> 74 </span>    <span class="muControl">break-unless</span> delete?
-<span id="L75" class="LineNr"> 75 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L76" class="LineNr"> 76 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L77" class="LineNr"> 77 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L78" class="LineNr"> 78 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L79" class="LineNr"> 79 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> delete?:bool <span class="Special">&lt;-</span> <a href='007-sandbox-delete.mu.html#L84'>should-attempt-delete?</a> click-row, click-column, env
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> delete?
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> delete?, env <span class="Special">&lt;-</span> <a href='007-sandbox-delete.mu.html#L99'>try-delete-sandbox</a> click-row, env
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> delete?
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L80" class="LineNr"> 80 </span>  <span class="Delimiter">}</span>
 <span id="L81" class="LineNr"> 81 </span>]
 <span id="L82" class="LineNr"> 82 </span>
@@ -172,27 +173,27 @@ if ('onhashchange' in window) {
 <span id="L112" class="LineNr">112 </span>  curr-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
 <span id="L113" class="LineNr">113 </span>  first-sandbox?:bool <span class="Special">&lt;-</span> equal curr-sandbox, sandbox
 <span id="L114" class="LineNr">114 </span>  <span class="Delimiter">{</span>
-<span id="L115" class="LineNr">115 </span>    <span class="Comment"># first sandbox? pop</span>
-<span id="L116" class="LineNr">116 </span>    <span class="muControl">break-unless</span> first-sandbox?
-<span id="L117" class="LineNr">117 </span>    next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L118" class="LineNr">118 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, next-sandbox
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Comment"># first sandbox? pop</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> first-sandbox?
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">sandbox:offset</span>, next-sandbox
 <span id="L119" class="LineNr">119 </span>  <span class="Delimiter">}</span>
 <span id="L120" class="LineNr">120 </span>  <span class="Delimiter">{</span>
-<span id="L121" class="LineNr">121 </span>    <span class="Comment"># not first sandbox?</span>
-<span id="L122" class="LineNr">122 </span>    <span class="muControl">break-if</span> first-sandbox?
-<span id="L123" class="LineNr">123 </span>    prev-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> copy curr-sandbox
-<span id="L124" class="LineNr">124 </span>    curr-sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L125" class="LineNr">125 </span>    <span class="Delimiter">{</span>
-<span id="L126" class="LineNr">126 </span>      assert curr-sandbox, <span class="Constant">[sandbox not found! something is wrong.]</span>
-<span id="L127" class="LineNr">127 </span>      found?:bool <span class="Special">&lt;-</span> equal curr-sandbox, sandbox
-<span id="L128" class="LineNr">128 </span>      <span class="muControl">break-if</span> found?
-<span id="L129" class="LineNr">129 </span>      prev-sandbox <span class="Special">&lt;-</span> copy curr-sandbox
-<span id="L130" class="LineNr">130 </span>      curr-sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L131" class="LineNr">131 </span>      <span class="muControl">loop</span>
-<span id="L132" class="LineNr">132 </span>    <span class="Delimiter">}</span>
-<span id="L133" class="LineNr">133 </span>    <span class="Comment"># snip sandbox out of its list</span>
-<span id="L134" class="LineNr">134 </span>    next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L135" class="LineNr">135 </span>    *prev-sandbox <span class="Special">&lt;-</span> put *prev-sandbox, <span class="Constant">next-sandbox:offset</span>, next-sandbox
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Comment"># not first sandbox?</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> first-sandbox?
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> prev-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> copy curr-sandbox
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> curr-sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert curr-sandbox, <span class="Constant">[sandbox not found! something is wrong.]</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> equal curr-sandbox, sandbox
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> prev-sandbox <span class="Special">&lt;-</span> copy curr-sandbox
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr-sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="Comment"># snip sandbox out of its list</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *curr-sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> *prev-sandbox <span class="Special">&lt;-</span> put *prev-sandbox, <span class="Constant">next-sandbox:offset</span>, next-sandbox
 <span id="L136" class="LineNr">136 </span>  <span class="Delimiter">}</span>
 <span id="L137" class="LineNr">137 </span>  <span class="Comment"># update sandbox count</span>
 <span id="L138" class="LineNr">138 </span>  sandbox-count:num <span class="Special">&lt;-</span> get *env, <span class="Constant">number-of-sandboxes:offset</span>
@@ -200,11 +201,11 @@ if ('onhashchange' in window) {
 <span id="L140" class="LineNr">140 </span>  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">number-of-sandboxes:offset</span>, sandbox-count
 <span id="L141" class="LineNr">141 </span>  <span class="Comment"># reset scroll if deleted sandbox was last</span>
 <span id="L142" class="LineNr">142 </span>  <span class="Delimiter">{</span>
-<span id="L143" class="LineNr">143 </span>    <span class="muControl">break-if</span> next-sandbox
-<span id="L144" class="LineNr">144 </span>    render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
-<span id="L145" class="LineNr">145 </span>    reset-scroll?:bool <span class="Special">&lt;-</span> equal render-from, sandbox-count
-<span id="L146" class="LineNr">146 </span>    <span class="muControl">break-unless</span> reset-scroll?
-<span id="L147" class="LineNr">147 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>,<span class="Constant"> -1</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> next-sandbox
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> reset-scroll?:bool <span class="Special">&lt;-</span> equal render-from, sandbox-count
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> reset-scroll?
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>,<span class="Constant"> -1</span>
 <span id="L148" class="LineNr">148 </span>  <span class="Delimiter">}</span>
 <span id="L149" class="LineNr">149 </span>]
 <span id="L150" class="LineNr">150 </span>
@@ -219,39 +220,39 @@ if ('onhashchange' in window) {
 <span id="L159" class="LineNr">159 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L160" class="LineNr">160 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L161" class="LineNr">161 </span>  assume-console [
-<span id="L162" class="LineNr">162 </span>    press ctrl-n
-<span id="L163" class="LineNr">163 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L164" class="LineNr">164 </span>    press F4
-<span id="L165" class="LineNr">165 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L166" class="LineNr">166 </span>    press F4
-<span id="L167" class="LineNr">167 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> press F4
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> press F4
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L168" class="LineNr">168 </span>  ]
 <span id="L169" class="LineNr">169 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L170" class="LineNr">170 </span>  screen-should-contain [
-<span id="L171" class="LineNr">171 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L172" class="LineNr">172 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L173" class="LineNr">173 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L174" class="LineNr">174 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L175" class="LineNr">175 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L176" class="LineNr">176 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L177" class="LineNr">177 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
 <span id="L178" class="LineNr">178 </span>  ]
 <span id="L179" class="LineNr">179 </span>  <span class="Comment"># delete the second sandbox</span>
 <span id="L180" class="LineNr">180 </span>  assume-console [
-<span id="L181" class="LineNr">181 </span>    left-click<span class="Constant"> 6</span>,<span class="Constant"> 99</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 6</span>,<span class="Constant"> 99</span>
 <span id="L182" class="LineNr">182 </span>  ]
 <span id="L183" class="LineNr">183 </span>  run [
-<span id="L184" class="LineNr">184 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L185" class="LineNr">185 </span>  ]
 <span id="L186" class="LineNr">186 </span>  <span class="Comment"># second sandbox shows in editor; scroll resets to display first sandbox</span>
 <span id="L187" class="LineNr">187 </span>  screen-should-contain [
-<span id="L188" class="LineNr">188 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L189" class="LineNr">189 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L190" class="LineNr">190 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L191" class="LineNr">191 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L192" class="LineNr">192 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L193" class="LineNr">193 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L194" class="LineNr">194 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L195" class="LineNr">195 </span>  ]
 <span id="L196" class="LineNr">196 </span>]
 <span id="L197" class="LineNr">197 </span>
@@ -266,39 +267,39 @@ if ('onhashchange' in window) {
 <span id="L206" class="LineNr">206 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L207" class="LineNr">207 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L208" class="LineNr">208 </span>  assume-console [
-<span id="L209" class="LineNr">209 </span>    press ctrl-n
-<span id="L210" class="LineNr">210 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L211" class="LineNr">211 </span>    press F4
-<span id="L212" class="LineNr">212 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L213" class="LineNr">213 </span>    press F4
-<span id="L214" class="LineNr">214 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> press F4
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> press F4
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L215" class="LineNr">215 </span>  ]
 <span id="L216" class="LineNr">216 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L217" class="LineNr">217 </span>  screen-should-contain [
-<span id="L218" class="LineNr">218 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L219" class="LineNr">219 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L220" class="LineNr">220 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L221" class="LineNr">221 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L222" class="LineNr">222 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L223" class="LineNr">223 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L224" class="LineNr">224 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
 <span id="L225" class="LineNr">225 </span>  ]
 <span id="L226" class="LineNr">226 </span>  <span class="Comment"># delete the second sandbox</span>
 <span id="L227" class="LineNr">227 </span>  assume-console [
-<span id="L228" class="LineNr">228 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 99</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 99</span>
 <span id="L229" class="LineNr">229 </span>  ]
 <span id="L230" class="LineNr">230 </span>  run [
-<span id="L231" class="LineNr">231 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L232" class="LineNr">232 </span>  ]
 <span id="L233" class="LineNr">233 </span>  <span class="Comment"># second sandbox shows in editor; scroll resets to display first sandbox</span>
 <span id="L234" class="LineNr">234 </span>  screen-should-contain [
-<span id="L235" class="LineNr">235 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L236" class="LineNr">236 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L237" class="LineNr">237 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L238" class="LineNr">238 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L239" class="LineNr">239 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L240" class="LineNr">240 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L241" class="LineNr">241 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L242" class="LineNr">242 </span>  ]
 <span id="L243" class="LineNr">243 </span>]
 <span id="L244" class="LineNr">244 </span>
@@ -313,41 +314,41 @@ if ('onhashchange' in window) {
 <span id="L253" class="LineNr">253 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L254" class="LineNr">254 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L255" class="LineNr">255 </span>  assume-console [
-<span id="L256" class="LineNr">256 </span>    press ctrl-n
-<span id="L257" class="LineNr">257 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L258" class="LineNr">258 </span>    press F4
-<span id="L259" class="LineNr">259 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L260" class="LineNr">260 </span>    press F4
-<span id="L261" class="LineNr">261 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L262" class="LineNr">262 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> press F4
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> press F4
+<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L263" class="LineNr">263 </span>  ]
 <span id="L264" class="LineNr">264 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L265" class="LineNr">265 </span>  screen-should-contain [
-<span id="L266" class="LineNr">266 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L267" class="LineNr">267 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L268" class="LineNr">268 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L269" class="LineNr">269 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L270" class="LineNr">270 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L271" class="LineNr">271 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L272" class="LineNr">272 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L273" class="LineNr">273 </span>  ]
 <span id="L274" class="LineNr">274 </span>  <span class="Comment"># delete the second sandbox</span>
 <span id="L275" class="LineNr">275 </span>  assume-console [
-<span id="L276" class="LineNr">276 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 99</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 99</span>
 <span id="L277" class="LineNr">277 </span>  ]
 <span id="L278" class="LineNr">278 </span>  run [
-<span id="L279" class="LineNr">279 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L280" class="LineNr">280 </span>  ]
 <span id="L281" class="LineNr">281 </span>  <span class="Comment"># implicitly scroll up to first sandbox</span>
 <span id="L282" class="LineNr">282 </span>  screen-should-contain [
-<span id="L283" class="LineNr">283 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L284" class="LineNr">284 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L285" class="LineNr">285 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L286" class="LineNr">286 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L287" class="LineNr">287 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L288" class="LineNr">288 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L289" class="LineNr">289 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L290" class="LineNr">290 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L285" class="LineNr">285 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L291" class="LineNr">291 </span>  ]
 <span id="L292" class="LineNr">292 </span>]
 <span id="L293" class="LineNr">293 </span>
@@ -362,43 +363,43 @@ if ('onhashchange' in window) {
 <span id="L302" class="LineNr">302 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L303" class="LineNr">303 </span>  <span class="Comment"># create 2 sandboxes</span>
 <span id="L304" class="LineNr">304 </span>  assume-console [
-<span id="L305" class="LineNr">305 </span>    press ctrl-n
-<span id="L306" class="LineNr">306 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L307" class="LineNr">307 </span>    press F4
-<span id="L308" class="LineNr">308 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L309" class="LineNr">309 </span>    press F4
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> press F4
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> press F4
 <span id="L310" class="LineNr">310 </span>  ]
 <span id="L311" class="LineNr">311 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L312" class="LineNr">312 </span>  screen-should-contain [
-<span id="L313" class="LineNr">313 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L314" class="LineNr">314 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L315" class="LineNr">315 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L316" class="LineNr">316 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L317" class="LineNr">317 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L318" class="LineNr">318 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L319" class="LineNr">319 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L320" class="LineNr">320 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L321" class="LineNr">321 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L322" class="LineNr">322 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L315" class="LineNr">315 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L323" class="LineNr">323 </span>  ]
 <span id="L324" class="LineNr">324 </span>  <span class="Comment"># delete the second sandbox, then try to scroll down twice</span>
 <span id="L325" class="LineNr">325 </span>  assume-console [
-<span id="L326" class="LineNr">326 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 99</span>
-<span id="L327" class="LineNr">327 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L328" class="LineNr">328 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L326" class="LineNr">326 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 99</span>
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L329" class="LineNr">329 </span>  ]
 <span id="L330" class="LineNr">330 </span>  run [
-<span id="L331" class="LineNr">331 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L331" class="LineNr">331 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L332" class="LineNr">332 </span>  ]
 <span id="L333" class="LineNr">333 </span>  <span class="Comment"># shouldn't go past last sandbox</span>
 <span id="L334" class="LineNr">334 </span>  screen-should-contain [
-<span id="L335" class="LineNr">335 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L336" class="LineNr">336 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L337" class="LineNr">337 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L338" class="LineNr">338 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L339" class="LineNr">339 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L340" class="LineNr">340 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L341" class="LineNr">341 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L342" class="LineNr">342 </span>  ]
 <span id="L343" class="LineNr">343 </span>]
 </pre>
diff --git a/html/edit/008-sandbox-edit.mu.html b/html/edit/008-sandbox-edit.mu.html
index e253a4c5..e1a3ecc6 100644
--- a/html/edit/008-sandbox-edit.mu.html
+++ b/html/edit/008-sandbox-edit.mu.html
@@ -15,15 +15,16 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -70,45 +71,45 @@ if ('onhashchange' in window) {
 <span id="L10" class="LineNr"> 10 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 2, 2]</span>
 <span id="L11" class="LineNr"> 11 </span>  <span class="Comment"># run it</span>
 <span id="L12" class="LineNr"> 12 </span>  assume-console [
-<span id="L13" class="LineNr"> 13 </span>    press F4
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> press F4
 <span id="L14" class="LineNr"> 14 </span>  ]
 <span id="L15" class="LineNr"> 15 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L16" class="LineNr"> 16 </span>  screen-should-contain [
-<span id="L17" class="LineNr"> 17 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L18" class="LineNr"> 18 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L19" class="LineNr"> 19 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L20" class="LineNr"> 20 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L21" class="LineNr"> 21 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L22" class="LineNr"> 22 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L19" class="LineNr"> 19 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L25" class="LineNr"> 25 </span>  ]
 <span id="L26" class="LineNr"> 26 </span>  <span class="Comment"># click at left edge of 'edit' button</span>
 <span id="L27" class="LineNr"> 27 </span>  assume-console [
-<span id="L28" class="LineNr"> 28 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 55</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 55</span>
 <span id="L29" class="LineNr"> 29 </span>  ]
 <span id="L30" class="LineNr"> 30 </span>  run [
-<span id="L31" class="LineNr"> 31 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L32" class="LineNr"> 32 </span>  ]
 <span id="L33" class="LineNr"> 33 </span>  <span class="Comment"># it pops back into editor</span>
 <span id="L34" class="LineNr"> 34 </span>  screen-should-contain [
-<span id="L35" class="LineNr"> 35 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L36" class="LineNr"> 36 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L37" class="LineNr"> 37 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L38" class="LineNr"> 38 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L37" class="LineNr"> 37 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L39" class="LineNr"> 39 </span>  ]
 <span id="L40" class="LineNr"> 40 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L41" class="LineNr"> 41 </span>  assume-console [
-<span id="L42" class="LineNr"> 42 </span>    type <span class="Constant">[0]</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L43" class="LineNr"> 43 </span>  ]
 <span id="L44" class="LineNr"> 44 </span>  run [
-<span id="L45" class="LineNr"> 45 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L46" class="LineNr"> 46 </span>  ]
 <span id="L47" class="LineNr"> 47 </span>  screen-should-contain [
-<span id="L48" class="LineNr"> 48 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L49" class="LineNr"> 49 </span>   <span class="Constant"> .                                                  ╎0add 2, 2                                        .</span>
-<span id="L50" class="LineNr"> 50 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L51" class="LineNr"> 51 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L48" class="LineNr"> 48 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0add 2, 2                                        .</span>
+<span id="L50" class="LineNr"> 50 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L52" class="LineNr"> 52 </span>  ]
 <span id="L53" class="LineNr"> 53 </span>]
 <span id="L54" class="LineNr"> 54 </span>
@@ -122,60 +123,60 @@ if ('onhashchange' in window) {
 <span id="L62" class="LineNr"> 62 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[add 2, 2]</span>
 <span id="L63" class="LineNr"> 63 </span>  <span class="Comment"># run it</span>
 <span id="L64" class="LineNr"> 64 </span>  assume-console [
-<span id="L65" class="LineNr"> 65 </span>    press F4
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> press F4
 <span id="L66" class="LineNr"> 66 </span>  ]
 <span id="L67" class="LineNr"> 67 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L68" class="LineNr"> 68 </span>  screen-should-contain [
-<span id="L69" class="LineNr"> 69 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L70" class="LineNr"> 70 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L71" class="LineNr"> 71 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L72" class="LineNr"> 72 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L73" class="LineNr"> 73 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L74" class="LineNr"> 74 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L75" class="LineNr"> 75 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L76" class="LineNr"> 76 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L71" class="LineNr"> 71 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L74" class="LineNr"> 74 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L77" class="LineNr"> 77 </span>  ]
 <span id="L78" class="LineNr"> 78 </span>  <span class="Comment"># click at right edge of 'edit' button (just before 'copy')</span>
 <span id="L79" class="LineNr"> 79 </span>  assume-console [
-<span id="L80" class="LineNr"> 80 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 68</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 68</span>
 <span id="L81" class="LineNr"> 81 </span>  ]
 <span id="L82" class="LineNr"> 82 </span>  run [
-<span id="L83" class="LineNr"> 83 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L84" class="LineNr"> 84 </span>  ]
 <span id="L85" class="LineNr"> 85 </span>  <span class="Comment"># it pops back into editor</span>
 <span id="L86" class="LineNr"> 86 </span>  screen-should-contain [
-<span id="L87" class="LineNr"> 87 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L88" class="LineNr"> 88 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L89" class="LineNr"> 89 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L90" class="LineNr"> 90 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L89" class="LineNr"> 89 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L91" class="LineNr"> 91 </span>  ]
 <span id="L92" class="LineNr"> 92 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L93" class="LineNr"> 93 </span>  assume-console [
-<span id="L94" class="LineNr"> 94 </span>    type <span class="Constant">[0]</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L95" class="LineNr"> 95 </span>  ]
 <span id="L96" class="LineNr"> 96 </span>  run [
-<span id="L97" class="LineNr"> 97 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L98" class="LineNr"> 98 </span>  ]
 <span id="L99" class="LineNr"> 99 </span>  screen-should-contain [
-<span id="L100" class="LineNr">100 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L101" class="LineNr">101 </span>   <span class="Constant"> .                                                  ╎0add 2, 2                                        .</span>
-<span id="L102" class="LineNr">102 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L103" class="LineNr">103 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0add 2, 2                                        .</span>
+<span id="L102" class="LineNr">102 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L104" class="LineNr">104 </span>  ]
 <span id="L105" class="LineNr">105 </span>]
 <span id="L106" class="LineNr">106 </span>
 <span id="L107" class="LineNr">107 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span> [
 <span id="L108" class="LineNr">108 </span>  <span class="Comment"># support 'edit' button</span>
 <span id="L109" class="LineNr">109 </span>  <span class="Delimiter">{</span>
-<span id="L110" class="LineNr">110 </span>    edit?:bool <span class="Special">&lt;-</span> <a href='008-sandbox-edit.mu.html#L123'>should-attempt-edit?</a> click-row, click-column, env
-<span id="L111" class="LineNr">111 </span>    <span class="muControl">break-unless</span> edit?
-<span id="L112" class="LineNr">112 </span>    edit?, env <span class="Special">&lt;-</span> <a href='008-sandbox-edit.mu.html#L142'>try-edit-sandbox</a> click-row, env
-<span id="L113" class="LineNr">113 </span>    <span class="muControl">break-unless</span> edit?
-<span id="L114" class="LineNr">114 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L115" class="LineNr">115 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L116" class="LineNr">116 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L117" class="LineNr">117 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L118" class="LineNr">118 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> edit?:bool <span class="Special">&lt;-</span> <a href='008-sandbox-edit.mu.html#L123'>should-attempt-edit?</a> click-row, click-column, env
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> edit?
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> edit?, env <span class="Special">&lt;-</span> <a href='008-sandbox-edit.mu.html#L142'>try-edit-sandbox</a> click-row, env
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> edit?
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L119" class="LineNr">119 </span>  <span class="Delimiter">}</span>
 <span id="L120" class="LineNr">120 </span>]
 <span id="L121" class="LineNr">121 </span>
@@ -228,37 +229,37 @@ if ('onhashchange' in window) {
 <span id="L168" class="LineNr">168 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[print <a href='../081print.mu.html#L4'>screen</a>, 4]</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Comment"># run the sandbox</span>
 <span id="L170" class="LineNr">170 </span>  assume-console [
-<span id="L171" class="LineNr">171 </span>    press F4
+<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> press F4
 <span id="L172" class="LineNr">172 </span>  ]
 <span id="L173" class="LineNr">173 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L174" class="LineNr">174 </span>  screen-should-contain [
-<span id="L175" class="LineNr">175 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L176" class="LineNr">176 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L177" class="LineNr">177 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L178" class="LineNr">178 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L179" class="LineNr">179 </span>   <span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L4'>screen</a>, 4                                  .</span>
-<span id="L180" class="LineNr">180 </span>   <span class="Constant"> .                                                  ╎screen:                                          .</span>
-<span id="L181" class="LineNr">181 </span>   <span class="Constant"> .                                                  ╎  .4                             .               .</span>
-<span id="L182" class="LineNr">182 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L183" class="LineNr">183 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L184" class="LineNr">184 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L185" class="LineNr">185 </span>   <span class="Constant"> .                                                  ╎  .                              .               .</span>
-<span id="L186" class="LineNr">186 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L187" class="LineNr">187 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L177" class="LineNr">177 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L4'>screen</a>, 4                                  .</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎screen:                                          .</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .4                             .               .</span>
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎  .                              .               .</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L188" class="LineNr">188 </span>  ]
 <span id="L189" class="LineNr">189 </span>  <span class="Comment"># edit the sandbox</span>
 <span id="L190" class="LineNr">190 </span>  assume-console [
-<span id="L191" class="LineNr">191 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 65</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 65</span>
 <span id="L192" class="LineNr">192 </span>  ]
 <span id="L193" class="LineNr">193 </span>  run [
-<span id="L194" class="LineNr">194 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L195" class="LineNr">195 </span>  ]
 <span id="L196" class="LineNr">196 </span>  screen-should-contain [
-<span id="L197" class="LineNr">197 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L198" class="LineNr">198 </span>   <span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L4'>screen</a>, 4                                  .</span>
-<span id="L199" class="LineNr">199 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L200" class="LineNr">200 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L201" class="LineNr">201 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎print <a href='../081print.mu.html#L4'>screen</a>, 4                                  .</span>
+<span id="L199" class="LineNr">199 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L202" class="LineNr">202 </span>  ]
 <span id="L203" class="LineNr">203 </span>]
 <span id="L204" class="LineNr">204 </span>
@@ -273,41 +274,41 @@ if ('onhashchange' in window) {
 <span id="L213" class="LineNr">213 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L214" class="LineNr">214 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L215" class="LineNr">215 </span>  assume-console [
-<span id="L216" class="LineNr">216 </span>    press ctrl-n
-<span id="L217" class="LineNr">217 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L218" class="LineNr">218 </span>    press F4
-<span id="L219" class="LineNr">219 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L220" class="LineNr">220 </span>    press F4
-<span id="L221" class="LineNr">221 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L222" class="LineNr">222 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> press F4
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> press F4
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L223" class="LineNr">223 </span>  ]
 <span id="L224" class="LineNr">224 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L225" class="LineNr">225 </span>  screen-should-contain [
-<span id="L226" class="LineNr">226 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L227" class="LineNr">227 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L228" class="LineNr">228 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L229" class="LineNr">229 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L230" class="LineNr">230 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L231" class="LineNr">231 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L232" class="LineNr">232 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L233" class="LineNr">233 </span>  ]
 <span id="L234" class="LineNr">234 </span>  <span class="Comment"># edit the second sandbox</span>
 <span id="L235" class="LineNr">235 </span>  assume-console [
-<span id="L236" class="LineNr">236 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 55</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 55</span>
 <span id="L237" class="LineNr">237 </span>  ]
 <span id="L238" class="LineNr">238 </span>  run [
-<span id="L239" class="LineNr">239 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L240" class="LineNr">240 </span>  ]
 <span id="L241" class="LineNr">241 </span>  <span class="Comment"># second sandbox shows in editor; scroll resets to display first sandbox</span>
 <span id="L242" class="LineNr">242 </span>  screen-should-contain [
-<span id="L243" class="LineNr">243 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L244" class="LineNr">244 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L245" class="LineNr">245 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L246" class="LineNr">246 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L247" class="LineNr">247 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L248" class="LineNr">248 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L249" class="LineNr">249 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L250" class="LineNr">250 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L245" class="LineNr">245 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L251" class="LineNr">251 </span>  ]
 <span id="L252" class="LineNr">252 </span>]
 <span id="L253" class="LineNr">253 </span>
@@ -322,64 +323,64 @@ if ('onhashchange' in window) {
 <span id="L262" class="LineNr">262 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L263" class="LineNr">263 </span>  <span class="Comment"># create 2 sandboxes</span>
 <span id="L264" class="LineNr">264 </span>  assume-console [
-<span id="L265" class="LineNr">265 </span>    press ctrl-n
-<span id="L266" class="LineNr">266 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L267" class="LineNr">267 </span>    press F4
-<span id="L268" class="LineNr">268 </span>    type <span class="Constant">[add 1, 1]</span>
-<span id="L269" class="LineNr">269 </span>    press F4
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> press F4
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span> press F4
 <span id="L270" class="LineNr">270 </span>  ]
 <span id="L271" class="LineNr">271 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L272" class="LineNr">272 </span>  screen-should-contain [
-<span id="L273" class="LineNr">273 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L274" class="LineNr">274 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L275" class="LineNr">275 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L276" class="LineNr">276 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L277" class="LineNr">277 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L278" class="LineNr">278 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L279" class="LineNr">279 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L280" class="LineNr">280 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L281" class="LineNr">281 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L282" class="LineNr">282 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L275" class="LineNr">275 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L276" class="LineNr">276 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L283" class="LineNr">283 </span>  ]
 <span id="L284" class="LineNr">284 </span>  <span class="Comment"># edit the second sandbox, then resave</span>
 <span id="L285" class="LineNr">285 </span>  assume-console [
-<span id="L286" class="LineNr">286 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 60</span>
-<span id="L287" class="LineNr">287 </span>    press F4
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 60</span>
+<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span> press F4
 <span id="L288" class="LineNr">288 </span>  ]
 <span id="L289" class="LineNr">289 </span>  run [
-<span id="L290" class="LineNr">290 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L291" class="LineNr">291 </span>  ]
 <span id="L292" class="LineNr">292 </span>  <span class="Comment"># no change in contents</span>
 <span id="L293" class="LineNr">293 </span>  screen-should-contain [
-<span id="L294" class="LineNr">294 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L295" class="LineNr">295 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L296" class="LineNr">296 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L297" class="LineNr">297 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L298" class="LineNr">298 </span>   <span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L299" class="LineNr">299 </span>   <span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L300" class="LineNr">300 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L301" class="LineNr">301 </span>   <span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L302" class="LineNr">302 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L303" class="LineNr">303 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L296" class="LineNr">296 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
 <span id="L304" class="LineNr">304 </span>  ]
 <span id="L305" class="LineNr">305 </span>  <span class="Comment"># now try to scroll past end</span>
 <span id="L306" class="LineNr">306 </span>  assume-console [
-<span id="L307" class="LineNr">307 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L308" class="LineNr">308 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L309" class="LineNr">309 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L310" class="LineNr">310 </span>  ]
 <span id="L311" class="LineNr">311 </span>  run [
-<span id="L312" class="LineNr">312 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L312" class="LineNr">312 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L313" class="LineNr">313 </span>  ]
 <span id="L314" class="LineNr">314 </span>  <span class="Comment"># screen should show just final sandbox with the right index (1)</span>
 <span id="L315" class="LineNr">315 </span>  screen-should-contain [
-<span id="L316" class="LineNr">316 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L317" class="LineNr">317 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L318" class="LineNr">318 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L319" class="LineNr">319 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L320" class="LineNr">320 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L321" class="LineNr">321 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L322" class="LineNr">322 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L323" class="LineNr">323 </span>  ]
 <span id="L324" class="LineNr">324 </span>]
 </pre>
diff --git a/html/edit/009-sandbox-test.mu.html b/html/edit/009-sandbox-test.mu.html
index 578ffb9f..40dd1013 100644
--- a/html/edit/009-sandbox-test.mu.html
+++ b/html/edit/009-sandbox-test.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -67,82 +68,82 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr">  6 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
 <span id="L7" class="LineNr">  7 </span>  <span class="Comment"># basic recipe</span>
 <span id="L8" class="LineNr">  8 </span>  assume-resources [
-<span id="L9" class="LineNr">  9 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L10" class="LineNr"> 10 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L11" class="LineNr"> 11 </span><span class="Constant">      |  reply 4|</span>
-<span id="L12" class="LineNr"> 12 </span><span class="Constant">      |]</span>|
-<span id="L13" class="LineNr"> 13 </span>    ]
+<span id="L9" class="LineNr">  9 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L11" class="LineNr"> 11 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  reply 4|</span>
+<span id="L12" class="LineNr"> 12 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> ]
 <span id="L14" class="LineNr"> 14 </span>  ]
 <span id="L15" class="LineNr"> 15 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L16" class="LineNr"> 16 </span>  <span class="Comment"># run it</span>
 <span id="L17" class="LineNr"> 17 </span>  assume-console [
-<span id="L18" class="LineNr"> 18 </span>    press F4
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> press F4
 <span id="L19" class="LineNr"> 19 </span>  ]
 <span id="L20" class="LineNr"> 20 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L21" class="LineNr"> 21 </span>  screen-should-contain [
-<span id="L22" class="LineNr"> 22 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .  reply 4                                         ╎─────────────────────────────────────────────────.</span>
-<span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<span id="L27" class="LineNr"> 27 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎4                                                .</span>
-<span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L29" class="LineNr"> 29 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply 4                                         ╎─────────────────────────────────────────────────.</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎4                                                .</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L29" class="LineNr"> 29 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L30" class="LineNr"> 30 </span>  ]
 <span id="L31" class="LineNr"> 31 </span>  <span class="Comment"># click on the '4' in the result</span>
 <span id="L32" class="LineNr"> 32 </span>  assume-console [
-<span id="L33" class="LineNr"> 33 </span>    left-click<span class="Constant"> 5</span>,<span class="Constant"> 51</span>
+<span id="L33" class="LineNr"> 33 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 5</span>,<span class="Constant"> 51</span>
 <span id="L34" class="LineNr"> 34 </span>  ]
 <span id="L35" class="LineNr"> 35 </span>  run [
-<span id="L36" class="LineNr"> 36 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L37" class="LineNr"> 37 </span>  ]
 <span id="L38" class="LineNr"> 38 </span>  <span class="Comment"># color toggles to green</span>
 <span id="L39" class="LineNr"> 39 </span>  screen-should-contain-in-color <span class="Constant">2/green</span>, [
-<span id="L40" class="LineNr"> 40 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L41" class="LineNr"> 41 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L44" class="LineNr"> 44 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> .                                                   4                                                .</span>
-<span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L47" class="LineNr"> 47 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L40" class="LineNr"> 40 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   4                                                .</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L47" class="LineNr"> 47 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L48" class="LineNr"> 48 </span>  ]
 <span id="L49" class="LineNr"> 49 </span>  <span class="Comment"># cursor should remain unmoved</span>
 <span id="L50" class="LineNr"> 50 </span>  run [
-<span id="L51" class="LineNr"> 51 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L52" class="LineNr"> 52 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L53" class="LineNr"> 53 </span>  ]
 <span id="L54" class="LineNr"> 54 </span>  screen-should-contain [
-<span id="L55" class="LineNr"> 55 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L56" class="LineNr"> 56 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
-<span id="L57" class="LineNr"> 57 </span>   <span class="Constant"> .  reply 4                                         ╎─────────────────────────────────────────────────.</span>
-<span id="L58" class="LineNr"> 58 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<span id="L59" class="LineNr"> 59 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<span id="L60" class="LineNr"> 60 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎4                                                .</span>
-<span id="L61" class="LineNr"> 61 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L62" class="LineNr"> 62 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L55" class="LineNr"> 55 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply 4                                         ╎─────────────────────────────────────────────────.</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎4                                                .</span>
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L63" class="LineNr"> 63 </span>  ]
 <span id="L64" class="LineNr"> 64 </span>  <span class="Comment"># now change the result</span>
 <span id="L65" class="LineNr"> 65 </span>  <span class="Comment"># then rerun</span>
 <span id="L66" class="LineNr"> 66 </span>  assume-console [
-<span id="L67" class="LineNr"> 67 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 11</span>  <span class="Comment"># cursor to end of line</span>
-<span id="L68" class="LineNr"> 68 </span>    press backspace
-<span id="L69" class="LineNr"> 69 </span>    type <span class="Constant">[3]</span>
-<span id="L70" class="LineNr"> 70 </span>    press F4
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 11</span>  <span class="Comment"># cursor to end of line</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> press backspace
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> type <span class="Constant">[3]</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> press F4
 <span id="L71" class="LineNr"> 71 </span>  ]
 <span id="L72" class="LineNr"> 72 </span>  run [
-<span id="L73" class="LineNr"> 73 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L73" class="LineNr"> 73 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L74" class="LineNr"> 74 </span>  ]
 <span id="L75" class="LineNr"> 75 </span>  <span class="Comment"># result turns red</span>
 <span id="L76" class="LineNr"> 76 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
-<span id="L77" class="LineNr"> 77 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L78" class="LineNr"> 78 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L79" class="LineNr"> 79 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L80" class="LineNr"> 80 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L81" class="LineNr"> 81 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L82" class="LineNr"> 82 </span>   <span class="Constant"> .                                                   3                                                .</span>
-<span id="L83" class="LineNr"> 83 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L84" class="LineNr"> 84 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L79" class="LineNr"> 79 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L80" class="LineNr"> 80 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L81" class="LineNr"> 81 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   3                                                .</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L85" class="LineNr"> 85 </span>  ]
 <span id="L86" class="LineNr"> 86 </span>]
 <span id="L87" class="LineNr"> 87 </span>
@@ -155,19 +156,19 @@ if ('onhashchange' in window) {
 <span id="L94" class="LineNr"> 94 </span><span class="Comment"># include expected response when saving or restoring a sandbox</span>
 <span id="L95" class="LineNr"> 95 </span><span class="muRecipe">before</span> <span class="Constant"><a href='005-sandbox.mu.html#L228'>&lt;end-save-sandbox&gt;</a></span> [
 <span id="L96" class="LineNr"> 96 </span>  <span class="Delimiter">{</span>
-<span id="L97" class="LineNr"> 97 </span>    expected-response:text <span class="Special">&lt;-</span> get *curr, <span class="Constant">expected-response:offset</span>
-<span id="L98" class="LineNr"> 98 </span>    <span class="muControl">break-unless</span> expected-response
-<span id="L99" class="LineNr"> 99 </span>    filename <span class="Special">&lt;-</span> append filename, <span class="Constant">[.out]</span>
-<span id="L100" class="LineNr">100 </span>    <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='../088file.mu.html#L127'>dump</a> <a href='../088file.mu.html#L11'>resources</a>, filename, expected-response
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> expected-response:text <span class="Special">&lt;-</span> get *curr, <span class="Constant">expected-response:offset</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> expected-response
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> filename <span class="Special">&lt;-</span> append filename, <span class="Constant">[.out]</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <a href='../088file.mu.html#L11'>resources</a> <span class="Special">&lt;-</span> <a href='../088file.mu.html#L127'>dump</a> <a href='../088file.mu.html#L11'>resources</a>, filename, expected-response
 <span id="L101" class="LineNr">101 </span>  <span class="Delimiter">}</span>
 <span id="L102" class="LineNr">102 </span>]
 <span id="L103" class="LineNr">103 </span>
 <span id="L104" class="LineNr">104 </span><span class="muRecipe">before</span> <span class="Constant"><a href='005-sandbox.mu.html#L432'>&lt;end-restore-sandbox&gt;</a></span> [
 <span id="L105" class="LineNr">105 </span>  <span class="Delimiter">{</span>
-<span id="L106" class="LineNr">106 </span>    filename <span class="Special">&lt;-</span> append filename, <span class="Constant">[.out]</span>
-<span id="L107" class="LineNr">107 </span>    contents <span class="Special">&lt;-</span> <a href='../088file.mu.html#L38'>slurp</a> <a href='../088file.mu.html#L11'>resources</a>, filename
-<span id="L108" class="LineNr">108 </span>    <span class="muControl">break-unless</span> contents
-<span id="L109" class="LineNr">109 </span>    *curr <span class="Special">&lt;-</span> put *curr, <span class="Constant">expected-response:offset</span>, contents
+<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> filename <span class="Special">&lt;-</span> append filename, <span class="Constant">[.out]</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> contents <span class="Special">&lt;-</span> <a href='../088file.mu.html#L38'>slurp</a> <a href='../088file.mu.html#L11'>resources</a>, filename
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> contents
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> *curr <span class="Special">&lt;-</span> put *curr, <span class="Constant">expected-response:offset</span>, contents
 <span id="L110" class="LineNr">110 </span>  <span class="Delimiter">}</span>
 <span id="L111" class="LineNr">111 </span>]
 <span id="L112" class="LineNr">112 </span>
@@ -175,28 +176,28 @@ if ('onhashchange' in window) {
 <span id="L114" class="LineNr">114 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span> [
 <span id="L115" class="LineNr">115 </span>  <span class="Comment"># check if it's inside the output of any sandbox</span>
 <span id="L116" class="LineNr">116 </span>  <span class="Delimiter">{</span>
-<span id="L117" class="LineNr">117 </span>    sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
-<span id="L118" class="LineNr">118 </span>    click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
-<span id="L119" class="LineNr">119 </span>    on-sandbox-side?:bool <span class="Special">&lt;-</span> greater-or-equal click-column, sandbox-left-margin
-<span id="L120" class="LineNr">120 </span>    <span class="muControl">break-unless</span> on-sandbox-side?
-<span id="L121" class="LineNr">121 </span>    first-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
-<span id="L122" class="LineNr">122 </span>    <span class="muControl">break-unless</span> first-sandbox
-<span id="L123" class="LineNr">123 </span>    first-sandbox-begins:num <span class="Special">&lt;-</span> get *first-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<span id="L124" class="LineNr">124 </span>    click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
-<span id="L125" class="LineNr">125 </span>    below-sandbox-editor?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, first-sandbox-begins
-<span id="L126" class="LineNr">126 </span>    <span class="muControl">break-unless</span> below-sandbox-editor?
-<span id="L127" class="LineNr">127 </span>    <span class="Comment"># identify the sandbox whose output is being clicked on</span>
-<span id="L128" class="LineNr">128 </span>    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> <a href='009-sandbox-test.mu.html#L142'>find-click-in-sandbox-output</a> env, click-row
-<span id="L129" class="LineNr">129 </span>    <span class="muControl">break-unless</span> sandbox
-<span id="L130" class="LineNr">130 </span>    <span class="Comment"># toggle its expected-response, and save session</span>
-<span id="L131" class="LineNr">131 </span>    sandbox <span class="Special">&lt;-</span> <a href='009-sandbox-test.mu.html#L168'>toggle-expected-response</a> sandbox
-<span id="L132" class="LineNr">132 </span>    <a href='005-sandbox.mu.html#L215'>save-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L133" class="LineNr">133 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L134" class="LineNr">134 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L135" class="LineNr">135 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L136" class="LineNr">136 </span>    <span class="Comment"># no change in cursor</span>
-<span id="L137" class="LineNr">137 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L138" class="LineNr">138 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> on-sandbox-side?:bool <span class="Special">&lt;-</span> greater-or-equal click-column, sandbox-left-margin
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> on-sandbox-side?
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> first-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> first-sandbox
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> first-sandbox-begins:num <span class="Special">&lt;-</span> get *first-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> below-sandbox-editor?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, first-sandbox-begins
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> below-sandbox-editor?
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Comment"># identify the sandbox whose output is being clicked on</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> sandbox:&amp;:sandbox <span class="Special">&lt;-</span> <a href='009-sandbox-test.mu.html#L142'>find-click-in-sandbox-output</a> env, click-row
+<span id="L129" class="LineNr">129 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox
+<span id="L130" class="LineNr">130 </span>  <span class="Conceal">¦</span> <span class="Comment"># toggle its expected-response, and save session</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> sandbox <span class="Special">&lt;-</span> <a href='009-sandbox-test.mu.html#L168'>toggle-expected-response</a> sandbox
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L215'>save-sandboxes</a> env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> <span class="Comment"># no change in cursor</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L138" class="LineNr">138 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L139" class="LineNr">139 </span>  <span class="Delimiter">}</span>
 <span id="L140" class="LineNr">140 </span>]
 <span id="L141" class="LineNr">141 </span>
@@ -210,13 +211,13 @@ if ('onhashchange' in window) {
 <span id="L149" class="LineNr">149 </span>  assert clicked-on-sandboxes?, <span class="Constant">[extract-sandbox called on click to sandbox editor]</span>
 <span id="L150" class="LineNr">150 </span>  <span class="Comment"># while click-row &lt; sandbox.next-sandbox.starting-row-on-screen</span>
 <span id="L151" class="LineNr">151 </span>  <span class="Delimiter">{</span>
-<span id="L152" class="LineNr">152 </span>    next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L153" class="LineNr">153 </span>    <span class="muControl">break-unless</span> next-sandbox
-<span id="L154" class="LineNr">154 </span>    next-start:num <span class="Special">&lt;-</span> get *next-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<span id="L155" class="LineNr">155 </span>    found?:bool <span class="Special">&lt;-</span> lesser-than click-row, next-start
-<span id="L156" class="LineNr">156 </span>    <span class="muControl">break-if</span> found?
-<span id="L157" class="LineNr">157 </span>    sandbox <span class="Special">&lt;-</span> copy next-sandbox
-<span id="L158" class="LineNr">158 </span>    <span class="muControl">loop</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> next-sandbox
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> next-start:num <span class="Special">&lt;-</span> get *next-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> lesser-than click-row, next-start
+<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> sandbox <span class="Special">&lt;-</span> copy next-sandbox
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Delimiter">}</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Comment"># return sandbox if click is in its output region</span>
 <span id="L161" class="LineNr">161 </span>  response-starting-row:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>
@@ -231,35 +232,35 @@ if ('onhashchange' in window) {
 <span id="L170" class="LineNr">170 </span>  <span class="Constant">load-ingredients</span>
 <span id="L171" class="LineNr">171 </span>  expected-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">expected-response:offset</span>
 <span id="L172" class="LineNr">172 </span>  <span class="Delimiter">{</span>
-<span id="L173" class="LineNr">173 </span>    <span class="Comment"># if expected-response is set, reset</span>
-<span id="L174" class="LineNr">174 </span>    <span class="muControl">break-unless</span> expected-response
-<span id="L175" class="LineNr">175 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">expected-response:offset</span>,<span class="Constant"> 0</span>
+<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Comment"># if expected-response is set, reset</span>
+<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> expected-response
+<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">expected-response:offset</span>,<span class="Constant"> 0</span>
 <span id="L176" class="LineNr">176 </span>  <span class="Delimiter">}</span>
 <span id="L177" class="LineNr">177 </span>  <span class="Delimiter">{</span>
-<span id="L178" class="LineNr">178 </span>    <span class="Comment"># if not, set expected response to the current response</span>
-<span id="L179" class="LineNr">179 </span>    <span class="muControl">break-if</span> expected-response
-<span id="L180" class="LineNr">180 </span>    response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response:offset</span>
-<span id="L181" class="LineNr">181 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">expected-response:offset</span>, response
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Comment"># if not, set expected response to the current response</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> expected-response
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">response:offset</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">expected-response:offset</span>, response
 <span id="L182" class="LineNr">182 </span>  <span class="Delimiter">}</span>
 <span id="L183" class="LineNr">183 </span>]
 <span id="L184" class="LineNr">184 </span>
 <span id="L185" class="LineNr">185 </span><span class="Comment"># when rendering a sandbox, color it in red/green if expected response exists</span>
 <span id="L186" class="LineNr">186 </span><span class="muRecipe">after</span> <span class="Constant"><a href='005-sandbox.mu.html#L292'>&lt;render-sandbox-response&gt;</a></span> [
 <span id="L187" class="LineNr">187 </span>  <span class="Delimiter">{</span>
-<span id="L188" class="LineNr">188 </span>    <span class="muControl">break-unless</span> sandbox-response
-<span id="L189" class="LineNr">189 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>, row
-<span id="L190" class="LineNr">190 </span>    expected-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">expected-response:offset</span>
-<span id="L191" class="LineNr">191 </span>    <span class="muControl">break-unless</span> expected-response  <span class="Comment"># fall-through to print in grey</span>
-<span id="L192" class="LineNr">192 </span>    response-is-expected?:bool <span class="Special">&lt;-</span> equal expected-response, sandbox-response
-<span id="L193" class="LineNr">193 </span>    <span class="Delimiter">{</span>
-<span id="L194" class="LineNr">194 </span>      <span class="muControl">break-if</span> response-is-expected?:bool
-<span id="L195" class="LineNr">195 </span>      row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-response, left, right, <span class="Constant">1/red</span>, row
-<span id="L196" class="LineNr">196 </span>    <span class="Delimiter">}</span>
-<span id="L197" class="LineNr">197 </span>    <span class="Delimiter">{</span>
-<span id="L198" class="LineNr">198 </span>      <span class="muControl">break-unless</span> response-is-expected?:bool
-<span id="L199" class="LineNr">199 </span>      row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-response, left, right, <span class="Constant">2/green</span>, row
-<span id="L200" class="LineNr">200 </span>    <span class="Delimiter">}</span>
-<span id="L201" class="LineNr">201 </span>    <span class="muControl">jump</span> <span class="Constant">+render-sandbox-end</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-response
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>, row
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> expected-response:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">expected-response:offset</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> expected-response  <span class="Comment"># fall-through to print in grey</span>
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> response-is-expected?:bool <span class="Special">&lt;-</span> equal expected-response, sandbox-response
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> response-is-expected?:bool
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-response, left, right, <span class="Constant">1/red</span>, row
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> response-is-expected?:bool
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-response, left, right, <span class="Constant">2/green</span>, row
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+render-sandbox-end</span>
 <span id="L202" class="LineNr">202 </span>  <span class="Delimiter">}</span>
 <span id="L203" class="LineNr">203 </span>]
 <span id="L204" class="LineNr">204 </span>
diff --git a/html/edit/010-sandbox-trace.mu.html b/html/edit/010-sandbox-trace.mu.html
index caafdea5..99709a40 100644
--- a/html/edit/010-sandbox-trace.mu.html
+++ b/html/edit/010-sandbox-trace.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -67,70 +68,70 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr">  6 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
 <span id="L7" class="LineNr">  7 </span>  <span class="Comment"># basic recipe</span>
 <span id="L8" class="LineNr">  8 </span>  assume-resources [
-<span id="L9" class="LineNr">  9 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L10" class="LineNr"> 10 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L11" class="LineNr"> 11 </span><span class="Constant">      |  stash [abc]</span>|
-<span id="L12" class="LineNr"> 12 </span><span class="Constant">      |]|</span>
-<span id="L13" class="LineNr"> 13 </span>    ]
+<span id="L9" class="LineNr">  9 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L10" class="LineNr"> 10 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L11" class="LineNr"> 11 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  stash [abc]</span>|
+<span id="L12" class="LineNr"> 12 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]|</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> ]
 <span id="L14" class="LineNr"> 14 </span>  ]
 <span id="L15" class="LineNr"> 15 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L16" class="LineNr"> 16 </span>  <span class="Comment"># run it</span>
 <span id="L17" class="LineNr"> 17 </span>  assume-console [
-<span id="L18" class="LineNr"> 18 </span>    press F4
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> press F4
 <span id="L19" class="LineNr"> 19 </span>  ]
 <span id="L20" class="LineNr"> 20 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L21" class="LineNr"> 21 </span>  screen-should-contain [
-<span id="L22" class="LineNr"> 22 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L23" class="LineNr"> 23 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L24" class="LineNr"> 24 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L25" class="LineNr"> 25 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<span id="L26" class="LineNr"> 26 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<span id="L27" class="LineNr"> 27 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L28" class="LineNr"> 28 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L23" class="LineNr"> 23 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L24" class="LineNr"> 24 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L27" class="LineNr"> 27 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L29" class="LineNr"> 29 </span>  ]
 <span id="L30" class="LineNr"> 30 </span>  <span class="Comment"># click on the code in the sandbox</span>
 <span id="L31" class="LineNr"> 31 </span>  assume-console [
-<span id="L32" class="LineNr"> 32 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
+<span id="L32" class="LineNr"> 32 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
 <span id="L33" class="LineNr"> 33 </span>  ]
 <span id="L34" class="LineNr"> 34 </span>  run [
-<span id="L35" class="LineNr"> 35 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L36" class="LineNr"> 36 </span>    cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L37" class="LineNr"> 37 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L35" class="LineNr"> 35 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L36" class="LineNr"> 36 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L38" class="LineNr"> 38 </span>  ]
 <span id="L39" class="LineNr"> 39 </span>  <span class="Comment"># trace now printed and cursor shouldn't have budged</span>
 <span id="L40" class="LineNr"> 40 </span>  screen-should-contain [
-<span id="L41" class="LineNr"> 41 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L42" class="LineNr"> 42 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
-<span id="L43" class="LineNr"> 43 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L44" class="LineNr"> 44 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<span id="L45" class="LineNr"> 45 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<span id="L46" class="LineNr"> 46 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
+<span id="L41" class="LineNr"> 41 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L42" class="LineNr"> 42 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
+<span id="L43" class="LineNr"> 43 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L44" class="LineNr"> 44 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L45" class="LineNr"> 45 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
 <span id="L47" class="LineNr"> 47 </span>  ]
 <span id="L48" class="LineNr"> 48 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
-<span id="L49" class="LineNr"> 49 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L50" class="LineNr"> 50 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L51" class="LineNr"> 51 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L52" class="LineNr"> 52 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L53" class="LineNr"> 53 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L54" class="LineNr"> 54 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
+<span id="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L52" class="LineNr"> 52 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L54" class="LineNr"> 54 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎abc                                              .</span>
 <span id="L55" class="LineNr"> 55 </span>  ]
 <span id="L56" class="LineNr"> 56 </span>  <span class="Comment"># click again on the same region</span>
 <span id="L57" class="LineNr"> 57 </span>  assume-console [
-<span id="L58" class="LineNr"> 58 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 55</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 4</span>,<span class="Constant"> 55</span>
 <span id="L59" class="LineNr"> 59 </span>  ]
 <span id="L60" class="LineNr"> 60 </span>  run [
-<span id="L61" class="LineNr"> 61 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
-<span id="L62" class="LineNr"> 62 </span>    print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L62" class="LineNr"> 62 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L63" class="LineNr"> 63 </span>  ]
 <span id="L64" class="LineNr"> 64 </span>  <span class="Comment"># trace hidden again</span>
 <span id="L65" class="LineNr"> 65 </span>  screen-should-contain [
-<span id="L66" class="LineNr"> 66 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L67" class="LineNr"> 67 </span>   <span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
-<span id="L68" class="LineNr"> 68 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L69" class="LineNr"> 69 </span>   <span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
-<span id="L70" class="LineNr"> 70 </span>   <span class="Constant"> .                                                  ╎foo                                              .</span>
-<span id="L71" class="LineNr"> 71 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L72" class="LineNr"> 72 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣ecipe foo [                                      ╎                                                 .</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎0   edit          copy            delete         .</span>
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎foo                                              .</span>
+<span id="L71" class="LineNr"> 71 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L73" class="LineNr"> 73 </span>  ]
 <span id="L74" class="LineNr"> 74 </span>]
 <span id="L75" class="LineNr"> 75 </span>
@@ -140,48 +141,48 @@ if ('onhashchange' in window) {
 <span id="L79" class="LineNr"> 79 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
 <span id="L80" class="LineNr"> 80 </span>  <span class="Comment"># basic recipe</span>
 <span id="L81" class="LineNr"> 81 </span>  assume-resources [
-<span id="L82" class="LineNr"> 82 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L83" class="LineNr"> 83 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L84" class="LineNr"> 84 </span><span class="Constant">      |  stash [abc]</span>|
-<span id="L85" class="LineNr"> 85 </span>      <span class="Constant">|</span>  <span class="muControl">reply</span> 4|
-<span id="L86" class="LineNr"> 86 </span><span class="Constant">      |]|</span>
-<span id="L87" class="LineNr"> 87 </span>    ]
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L84" class="LineNr"> 84 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  stash [abc]</span>|
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|</span>  <span class="muControl">reply</span> 4|
+<span id="L86" class="LineNr"> 86 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]|</span>
+<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> ]
 <span id="L88" class="LineNr"> 88 </span>  ]
 <span id="L89" class="LineNr"> 89 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L90" class="LineNr"> 90 </span>  <span class="Comment"># run it</span>
 <span id="L91" class="LineNr"> 91 </span>  assume-console [
-<span id="L92" class="LineNr"> 92 </span>    press F4
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> press F4
 <span id="L93" class="LineNr"> 93 </span>  ]
 <span id="L94" class="LineNr"> 94 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L95" class="LineNr"> 95 </span>  screen-should-contain [
-<span id="L96" class="LineNr"> 96 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L97" class="LineNr"> 97 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L98" class="LineNr"> 98 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L99" class="LineNr"> 99 </span>   <span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
-<span id="L100" class="LineNr">100 </span>   <span class="Constant"> .]                                                 ╎foo                                              .</span>
-<span id="L101" class="LineNr">101 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L102" class="LineNr">102 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L103" class="LineNr">103 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎foo                                              .</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L102" class="LineNr">102 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L104" class="LineNr">104 </span>  ]
 <span id="L105" class="LineNr">105 </span>  <span class="Comment"># click on the code in the sandbox</span>
 <span id="L106" class="LineNr">106 </span>  assume-console [
-<span id="L107" class="LineNr">107 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
+<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
 <span id="L108" class="LineNr">108 </span>  ]
 <span id="L109" class="LineNr">109 </span>  run [
-<span id="L110" class="LineNr">110 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L111" class="LineNr">111 </span>  ]
 <span id="L112" class="LineNr">112 </span>  <span class="Comment"># trace now printed above result</span>
 <span id="L113" class="LineNr">113 </span>  screen-should-contain [
-<span id="L114" class="LineNr">114 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L115" class="LineNr">115 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L116" class="LineNr">116 </span>   <span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L117" class="LineNr">117 </span>   <span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
-<span id="L118" class="LineNr">118 </span>   <span class="Constant"> .]                                                 ╎foo                                              .</span>
-<span id="L119" class="LineNr">119 </span>   <span class="Constant"> .                                                  ╎abc                                              .</span>
-<span id="L120" class="LineNr">120 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎8 instructions run                               .</span>
-<span id="L121" class="LineNr">121 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L122" class="LineNr">122 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L123" class="LineNr">123 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [abc]                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply 4                                         ╎0   edit          copy            delete         .</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎foo                                              .</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎abc                                              .</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎8 instructions run                               .</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L124" class="LineNr">124 </span>  ]
 <span id="L125" class="LineNr">125 </span>]
 <span id="L126" class="LineNr">126 </span>
@@ -194,33 +195,33 @@ if ('onhashchange' in window) {
 <span id="L133" class="LineNr">133 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[stash 123456789]</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Comment"># create and expand the trace</span>
 <span id="L135" class="LineNr">135 </span>  assume-console [
-<span id="L136" class="LineNr">136 </span>    press F4
-<span id="L137" class="LineNr">137 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span> press F4
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 4</span>,<span class="Constant"> 51</span>
 <span id="L138" class="LineNr">138 </span>  ]
 <span id="L139" class="LineNr">139 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L140" class="LineNr">140 </span>  screen-should-contain [
-<span id="L141" class="LineNr">141 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L142" class="LineNr">142 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L143" class="LineNr">143 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L144" class="LineNr">144 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L145" class="LineNr">145 </span>   <span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
-<span id="L146" class="LineNr">146 </span>   <span class="Constant"> .                                                  ╎123456789                                        .</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L143" class="LineNr">143 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎123456789                                        .</span>
 <span id="L147" class="LineNr">147 </span>  ]
 <span id="L148" class="LineNr">148 </span>  <span class="Comment"># click on the stash under the edit-button region (or any of the other buttons, really)</span>
 <span id="L149" class="LineNr">149 </span>  assume-console [
-<span id="L150" class="LineNr">150 </span>    left-click<span class="Constant"> 5</span>,<span class="Constant"> 57</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 5</span>,<span class="Constant"> 57</span>
 <span id="L151" class="LineNr">151 </span>  ]
 <span id="L152" class="LineNr">152 </span>  run [
-<span id="L153" class="LineNr">153 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L154" class="LineNr">154 </span>  ]
 <span id="L155" class="LineNr">155 </span>  <span class="Comment"># no change; doesn't die</span>
 <span id="L156" class="LineNr">156 </span>  screen-should-contain [
-<span id="L157" class="LineNr">157 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L158" class="LineNr">158 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L159" class="LineNr">159 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L160" class="LineNr">160 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L161" class="LineNr">161 </span>   <span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
-<span id="L162" class="LineNr">162 </span>   <span class="Constant"> .                                                  ╎123456789                                        .</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L159" class="LineNr">159 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎stash 123456789                                  .</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎123456789                                        .</span>
 <span id="L163" class="LineNr">163 </span>  ]
 <span id="L164" class="LineNr">164 </span>]
 <span id="L165" class="LineNr">165 </span>
@@ -244,29 +245,29 @@ if ('onhashchange' in window) {
 <span id="L183" class="LineNr">183 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L80'>&lt;global-touch&gt;</a></span> [
 <span id="L184" class="LineNr">184 </span>  <span class="Comment"># check if it's inside the code of any sandbox</span>
 <span id="L185" class="LineNr">185 </span>  <span class="Delimiter">{</span>
-<span id="L186" class="LineNr">186 </span>    sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
-<span id="L187" class="LineNr">187 </span>    click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
-<span id="L188" class="LineNr">188 </span>    on-sandbox-side?:bool <span class="Special">&lt;-</span> greater-or-equal click-column, sandbox-left-margin
-<span id="L189" class="LineNr">189 </span>    <span class="muControl">break-unless</span> on-sandbox-side?
-<span id="L190" class="LineNr">190 </span>    first-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
-<span id="L191" class="LineNr">191 </span>    <span class="muControl">break-unless</span> first-sandbox
-<span id="L192" class="LineNr">192 </span>    first-sandbox-begins:num <span class="Special">&lt;-</span> get *first-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<span id="L193" class="LineNr">193 </span>    click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
-<span id="L194" class="LineNr">194 </span>    below-sandbox-editor?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, first-sandbox-begins
-<span id="L195" class="LineNr">195 </span>    <span class="muControl">break-unless</span> below-sandbox-editor?
-<span id="L196" class="LineNr">196 </span>    <span class="Comment"># identify the sandbox whose code is being clicked on</span>
-<span id="L197" class="LineNr">197 </span>    sandbox:&amp;:sandbox <span class="Special">&lt;-</span> <a href='010-sandbox-trace.mu.html#L212'>find-click-in-sandbox-code</a> env, click-row
-<span id="L198" class="LineNr">198 </span>    <span class="muControl">break-unless</span> sandbox
-<span id="L199" class="LineNr">199 </span>    <span class="Comment"># toggle its display-trace? property</span>
-<span id="L200" class="LineNr">200 </span>    x:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
-<span id="L201" class="LineNr">201 </span>    x <span class="Special">&lt;-</span> not x
-<span id="L202" class="LineNr">202 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">display-trace?:offset</span>, x
-<span id="L203" class="LineNr">203 </span>    <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L204" class="LineNr">204 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
-<span id="L205" class="LineNr">205 </span>    <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L206" class="LineNr">206 </span>    <span class="Comment"># no change in cursor</span>
-<span id="L207" class="LineNr">207 </span>    <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L208" class="LineNr">208 </span>    <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> click-column:num <span class="Special">&lt;-</span> get t, <span class="Constant">column:offset</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> on-sandbox-side?:bool <span class="Special">&lt;-</span> greater-or-equal click-column, sandbox-left-margin
+<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> on-sandbox-side?
+<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> first-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> first-sandbox
+<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> first-sandbox-begins:num <span class="Special">&lt;-</span> get *first-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> click-row:num <span class="Special">&lt;-</span> get t, <span class="Constant">row:offset</span>
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> below-sandbox-editor?:bool <span class="Special">&lt;-</span> greater-or-equal click-row, first-sandbox-begins
+<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> below-sandbox-editor?
+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Comment"># identify the sandbox whose code is being clicked on</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> sandbox:&amp;:sandbox <span class="Special">&lt;-</span> <a href='010-sandbox-trace.mu.html#L212'>find-click-in-sandbox-code</a> env, click-row
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Comment"># toggle its display-trace? property</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> x:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> x <span class="Special">&lt;-</span> not x
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">display-trace?:offset</span>, x
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L623'>hide-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L511'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Comment"># no change in cursor</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L631'>show-screen</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L209" class="LineNr">209 </span>  <span class="Delimiter">}</span>
 <span id="L210" class="LineNr">210 </span>]
 <span id="L211" class="LineNr">211 </span>
@@ -280,13 +281,13 @@ if ('onhashchange' in window) {
 <span id="L219" class="LineNr">219 </span>  assert clicked-on-sandboxes?, <span class="Constant">[extract-sandbox called on click to sandbox editor]</span>
 <span id="L220" class="LineNr">220 </span>  <span class="Comment"># while click-row &lt; sandbox.next-sandbox.starting-row-on-screen</span>
 <span id="L221" class="LineNr">221 </span>  <span class="Delimiter">{</span>
-<span id="L222" class="LineNr">222 </span>    next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
-<span id="L223" class="LineNr">223 </span>    <span class="muControl">break-unless</span> next-sandbox
-<span id="L224" class="LineNr">224 </span>    next-start:num <span class="Special">&lt;-</span> get *next-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
-<span id="L225" class="LineNr">225 </span>    found?:bool <span class="Special">&lt;-</span> lesser-than click-row, next-start
-<span id="L226" class="LineNr">226 </span>    <span class="muControl">break-if</span> found?
-<span id="L227" class="LineNr">227 </span>    sandbox <span class="Special">&lt;-</span> copy next-sandbox
-<span id="L228" class="LineNr">228 </span>    <span class="muControl">loop</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> next-sandbox:&amp;:sandbox <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">next-sandbox:offset</span>
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> next-sandbox
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> next-start:num <span class="Special">&lt;-</span> get *next-sandbox, <span class="Constant">starting-row-on-screen:offset</span>
+<span id="L225" class="LineNr">225 </span>  <span class="Conceal">¦</span> found?:bool <span class="Special">&lt;-</span> lesser-than click-row, next-start
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> sandbox <span class="Special">&lt;-</span> copy next-sandbox
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L229" class="LineNr">229 </span>  <span class="Delimiter">}</span>
 <span id="L230" class="LineNr">230 </span>  <span class="Comment"># return sandbox if click is in its code region</span>
 <span id="L231" class="LineNr">231 </span>  code-ending-row:num <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">code-ending-row-on-screen:offset</span>
@@ -295,8 +296,8 @@ if ('onhashchange' in window) {
 <span id="L234" class="LineNr">234 </span>  click-below-menu?:bool <span class="Special">&lt;-</span> greater-than click-row, start
 <span id="L235" class="LineNr">235 </span>  click-on-sandbox-code?:bool <span class="Special">&lt;-</span> and click-above-response?, click-below-menu?
 <span id="L236" class="LineNr">236 </span>  <span class="Delimiter">{</span>
-<span id="L237" class="LineNr">237 </span>    <span class="muControl">break-if</span> click-on-sandbox-code?
-<span id="L238" class="LineNr">238 </span>    <span class="muControl">return</span> <span class="Constant">0/no-click-in-sandbox-output</span>
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> click-on-sandbox-code?
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">0/no-click-in-sandbox-output</span>
 <span id="L239" class="LineNr">239 </span>  <span class="Delimiter">}</span>
 <span id="L240" class="LineNr">240 </span>  <span class="muControl">return</span> sandbox
 <span id="L241" class="LineNr">241 </span>]
@@ -304,11 +305,11 @@ if ('onhashchange' in window) {
 <span id="L243" class="LineNr">243 </span><span class="Comment"># when rendering a sandbox, dump its trace before response/warning if display-trace? property is set</span>
 <span id="L244" class="LineNr">244 </span><span class="muRecipe">after</span> <span class="Constant"><a href='005-sandbox.mu.html#L283'>&lt;render-sandbox-results&gt;</a></span> [
 <span id="L245" class="LineNr">245 </span>  <span class="Delimiter">{</span>
-<span id="L246" class="LineNr">246 </span>    display-trace?:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
-<span id="L247" class="LineNr">247 </span>    <span class="muControl">break-unless</span> display-trace?
-<span id="L248" class="LineNr">248 </span>    sandbox-trace:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">trace:offset</span>
-<span id="L249" class="LineNr">249 </span>    <span class="muControl">break-unless</span> sandbox-trace  <span class="Comment"># nothing to print; move on</span>
-<span id="L250" class="LineNr">250 </span>    row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-trace, left, right, <span class="Constant">245/grey</span>, row
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> display-trace?:bool <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">display-trace?:offset</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> display-trace?
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> sandbox-trace:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">trace:offset</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-trace  <span class="Comment"># nothing to print; move on</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-trace, left, right, <span class="Constant">245/grey</span>, row
 <span id="L251" class="LineNr">251 </span>  <span class="Delimiter">}</span>
 <span id="L252" class="LineNr">252 </span><span class="Constant">  <a href='010-sandbox-trace.mu.html#L252'>&lt;render-sandbox-trace-done&gt;</a></span>
 <span id="L253" class="LineNr">253 </span>]
diff --git a/html/edit/011-errors.mu.html b/html/edit/011-errors.mu.html
index c30f72a8..5a15e5ff 100644
--- a/html/edit/011-errors.mu.html
+++ b/html/edit/011-errors.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -76,10 +77,10 @@ if ('onhashchange' in window) {
 <span id="L15" class="LineNr"> 15 </span>  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">recipe-errors:offset</span>, recipe-errors
 <span id="L16" class="LineNr"> 16 </span>  <span class="Comment"># if recipe editor has errors, stop</span>
 <span id="L17" class="LineNr"> 17 </span>  <span class="Delimiter">{</span>
-<span id="L18" class="LineNr"> 18 </span>    <span class="muControl">break-unless</span> recipe-errors
-<span id="L19" class="LineNr"> 19 </span>    <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[errors found     ]</span>, <span class="Constant">1/red</span>
-<span id="L20" class="LineNr"> 20 </span>    errors-found? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>
-<span id="L21" class="LineNr"> 21 </span>    <span class="muControl">return</span>
+<span id="L18" class="LineNr"> 18 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> recipe-errors
+<span id="L19" class="LineNr"> 19 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[errors found     ]</span>, <span class="Constant">1/red</span>
+<span id="L20" class="LineNr"> 20 </span>  <span class="Conceal">¦</span> errors-found? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>
+<span id="L21" class="LineNr"> 21 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L22" class="LineNr"> 22 </span>  <span class="Delimiter">}</span>
 <span id="L23" class="LineNr"> 23 </span>  errors-found? <span class="Special">&lt;-</span> copy <span class="Constant">0/false</span>
 <span id="L24" class="LineNr"> 24 </span>]
@@ -88,16 +89,16 @@ if ('onhashchange' in window) {
 <span id="L27" class="LineNr"> 27 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render status]</span>
 <span id="L28" class="LineNr"> 28 </span>  recipe-errors:text <span class="Special">&lt;-</span> get *env, <span class="Constant">recipe-errors:offset</span>
 <span id="L29" class="LineNr"> 29 </span>  <span class="Delimiter">{</span>
-<span id="L30" class="LineNr"> 30 </span>    <span class="muControl">break-unless</span> recipe-errors
-<span id="L31" class="LineNr"> 31 </span>    <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[errors found     ]</span>, <span class="Constant">1/red</span>
+<span id="L30" class="LineNr"> 30 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> recipe-errors
+<span id="L31" class="LineNr"> 31 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[errors found     ]</span>, <span class="Constant">1/red</span>
 <span id="L32" class="LineNr"> 32 </span>  <span class="Delimiter">}</span>
 <span id="L33" class="LineNr"> 33 </span>]
 <span id="L34" class="LineNr"> 34 </span>
 <span id="L35" class="LineNr"> 35 </span><span class="muRecipe">before</span> <span class="Constant"><a href='004-programming-environment.mu.html#L488'>&lt;render-recipe-components-end&gt;</a></span> [
 <span id="L36" class="LineNr"> 36 </span>  <span class="Delimiter">{</span>
-<span id="L37" class="LineNr"> 37 </span>    recipe-errors:text <span class="Special">&lt;-</span> get *env, <span class="Constant">recipe-errors:offset</span>
-<span id="L38" class="LineNr"> 38 </span>    <span class="muControl">break-unless</span> recipe-errors
-<span id="L39" class="LineNr"> 39 </span>    row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, recipe-errors, left, right, <span class="Constant">1/red</span>, row
+<span id="L37" class="LineNr"> 37 </span>  <span class="Conceal">¦</span> recipe-errors:text <span class="Special">&lt;-</span> get *env, <span class="Constant">recipe-errors:offset</span>
+<span id="L38" class="LineNr"> 38 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> recipe-errors
+<span id="L39" class="LineNr"> 39 </span>  <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, recipe-errors, left, right, <span class="Constant">1/red</span>, row
 <span id="L40" class="LineNr"> 40 </span>  <span class="Delimiter">}</span>
 <span id="L41" class="LineNr"> 41 </span>]
 <span id="L42" class="LineNr"> 42 </span>
@@ -115,22 +116,22 @@ if ('onhashchange' in window) {
 <span id="L54" class="LineNr"> 54 </span>
 <span id="L55" class="LineNr"> 55 </span><span class="muRecipe">before</span> <span class="Constant"><a href='005-sandbox.mu.html#L183'>&lt;run-sandboxes-end&gt;</a></span> [
 <span id="L56" class="LineNr"> 56 </span>  <span class="Delimiter">{</span>
-<span id="L57" class="LineNr"> 57 </span>    error-index:num <span class="Special">&lt;-</span> get *env, <span class="Constant">error-index:offset</span>
-<span id="L58" class="LineNr"> 58 </span>    sandboxes-completed-successfully?:bool <span class="Special">&lt;-</span> equal error-index,<span class="Constant"> -1</span>
-<span id="L59" class="LineNr"> 59 </span>    <span class="muControl">break-if</span> sandboxes-completed-successfully?
-<span id="L60" class="LineNr"> 60 </span>    errors-found? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>
+<span id="L57" class="LineNr"> 57 </span>  <span class="Conceal">¦</span> error-index:num <span class="Special">&lt;-</span> get *env, <span class="Constant">error-index:offset</span>
+<span id="L58" class="LineNr"> 58 </span>  <span class="Conceal">¦</span> sandboxes-completed-successfully?:bool <span class="Special">&lt;-</span> equal error-index,<span class="Constant"> -1</span>
+<span id="L59" class="LineNr"> 59 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandboxes-completed-successfully?
+<span id="L60" class="LineNr"> 60 </span>  <span class="Conceal">¦</span> errors-found? <span class="Special">&lt;-</span> copy <span class="Constant">1/true</span>
 <span id="L61" class="LineNr"> 61 </span>  <span class="Delimiter">}</span>
 <span id="L62" class="LineNr"> 62 </span>]
 <span id="L63" class="LineNr"> 63 </span>
 <span id="L64" class="LineNr"> 64 </span><span class="muRecipe">before</span> <span class="Constant"><a href='004-programming-environment.mu.html#L467'>&lt;render-components-end&gt;</a></span> [
 <span id="L65" class="LineNr"> 65 </span>  <span class="Delimiter">{</span>
-<span id="L66" class="LineNr"> 66 </span>    <span class="muControl">break-if</span> recipe-errors
-<span id="L67" class="LineNr"> 67 </span>    error-index:num <span class="Special">&lt;-</span> get *env, <span class="Constant">error-index:offset</span>
-<span id="L68" class="LineNr"> 68 </span>    sandboxes-completed-successfully?:bool <span class="Special">&lt;-</span> equal error-index,<span class="Constant"> -1</span>
-<span id="L69" class="LineNr"> 69 </span>    <span class="muControl">break-if</span> sandboxes-completed-successfully?
-<span id="L70" class="LineNr"> 70 </span>    error-index-text:text <span class="Special">&lt;-</span> to-text error-index
-<span id="L71" class="LineNr"> 71 </span>    status:text <span class="Special">&lt;-</span> <a href='../061text.mu.html#L506'>interpolate</a> <span class="Constant">[errors found (_)    ]</span>, error-index-text
-<span id="L72" class="LineNr"> 72 </span>    <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, status, <span class="Constant">1/red</span>
+<span id="L66" class="LineNr"> 66 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> recipe-errors
+<span id="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> error-index:num <span class="Special">&lt;-</span> get *env, <span class="Constant">error-index:offset</span>
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> sandboxes-completed-successfully?:bool <span class="Special">&lt;-</span> equal error-index,<span class="Constant"> -1</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandboxes-completed-successfully?
+<span id="L70" class="LineNr"> 70 </span>  <span class="Conceal">¦</span> error-index-text:text <span class="Special">&lt;-</span> to-text error-index
+<span id="L71" class="LineNr"> 71 </span>  <span class="Conceal">¦</span> status:text <span class="Special">&lt;-</span> <a href='../061text.mu.html#L506'>interpolate</a> <span class="Constant">[errors found (_)    ]</span>, error-index-text
+<span id="L72" class="LineNr"> 72 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L208'>update-status</a> <a href='../081print.mu.html#L4'>screen</a>, status, <span class="Constant">1/red</span>
 <span id="L73" class="LineNr"> 73 </span>  <span class="Delimiter">}</span>
 <span id="L74" class="LineNr"> 74 </span>]
 <span id="L75" class="LineNr"> 75 </span>
@@ -148,30 +149,30 @@ if ('onhashchange' in window) {
 <span id="L87" class="LineNr"> 87 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant"><a href='../081print.mu.html#L4'>screen</a>:offset</span>, fake-screen
 <span id="L88" class="LineNr"> 88 </span>  *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">trace:offset</span>, trace
 <span id="L89" class="LineNr"> 89 </span>  <span class="Delimiter">{</span>
-<span id="L90" class="LineNr"> 90 </span>    <span class="muControl">break-if</span> errors
-<span id="L91" class="LineNr"> 91 </span>    <span class="muControl">break-if</span> completed?:bool
-<span id="L92" class="LineNr"> 92 </span>    errors <span class="Special">&lt;-</span> new <span class="Constant">[took too long!</span>
+<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> errors
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> completed?:bool
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span> errors <span class="Special">&lt;-</span> new <span class="Constant">[took too long!</span>
 <span id="L93" class="LineNr"> 93 </span><span class="Constant">]</span>
-<span id="L94" class="LineNr"> 94 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">errors:offset</span>, errors
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">errors:offset</span>, errors
 <span id="L95" class="LineNr"> 95 </span>  <span class="Delimiter">}</span>
 <span id="L96" class="LineNr"> 96 </span>  <span class="Delimiter">{</span>
-<span id="L97" class="LineNr"> 97 </span>    <span class="muControl">break-unless</span> errors
-<span id="L98" class="LineNr"> 98 </span>    error-index:num <span class="Special">&lt;-</span> get *env, <span class="Constant">error-index:offset</span>
-<span id="L99" class="LineNr"> 99 </span>    error-not-set?:bool <span class="Special">&lt;-</span> equal error-index,<span class="Constant"> -1</span>
-<span id="L100" class="LineNr">100 </span>    <span class="muControl">break-unless</span> error-not-set?
-<span id="L101" class="LineNr">101 </span>    *env <span class="Special">&lt;-</span> put *env, <span class="Constant">error-index:offset</span>, idx
+<span id="L97" class="LineNr"> 97 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> errors
+<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> error-index:num <span class="Special">&lt;-</span> get *env, <span class="Constant">error-index:offset</span>
+<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> error-not-set?:bool <span class="Special">&lt;-</span> equal error-index,<span class="Constant"> -1</span>
+<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> error-not-set?
+<span id="L101" class="LineNr">101 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">error-index:offset</span>, idx
 <span id="L102" class="LineNr">102 </span>  <span class="Delimiter">}</span>
 <span id="L103" class="LineNr">103 </span>]
 <span id="L104" class="LineNr">104 </span>
 <span id="L105" class="LineNr">105 </span><span class="Comment"># make sure we render any trace</span>
 <span id="L106" class="LineNr">106 </span><span class="muRecipe">after</span> <span class="Constant"><a href='010-sandbox-trace.mu.html#L252'>&lt;render-sandbox-trace-done&gt;</a></span> [
 <span id="L107" class="LineNr">107 </span>  <span class="Delimiter">{</span>
-<span id="L108" class="LineNr">108 </span>    sandbox-errors:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">errors:offset</span>
-<span id="L109" class="LineNr">109 </span>    <span class="muControl">break-unless</span> sandbox-errors
-<span id="L110" class="LineNr">110 </span>    *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>,<span class="Constant"> 0</span>  <span class="Comment"># no response</span>
-<span id="L111" class="LineNr">111 </span>    row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-errors, left, right, <span class="Constant">1/red</span>, row
-<span id="L112" class="LineNr">112 </span>    <span class="Comment"># don't try to print anything more for this sandbox</span>
-<span id="L113" class="LineNr">113 </span>    <span class="muControl">jump</span> <span class="Constant">+render-sandbox-end</span>
+<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span> sandbox-errors:text <span class="Special">&lt;-</span> get *sandbox, <span class="Constant">errors:offset</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-errors
+<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> *sandbox <span class="Special">&lt;-</span> put *sandbox, <span class="Constant">response-starting-row-on-screen:offset</span>,<span class="Constant"> 0</span>  <span class="Comment"># no response</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span> row, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L356'>render-text</a> <a href='../081print.mu.html#L4'>screen</a>, sandbox-errors, left, right, <span class="Constant">1/red</span>, row
+<span id="L112" class="LineNr">112 </span>  <span class="Conceal">¦</span> <span class="Comment"># don't try to print anything more for this sandbox</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+render-sandbox-end</span>
 <span id="L114" class="LineNr">114 </span>  <span class="Delimiter">}</span>
 <span id="L115" class="LineNr">115 </span>]
 <span id="L116" class="LineNr">116 </span>
@@ -180,51 +181,51 @@ if ('onhashchange' in window) {
 <span id="L119" class="LineNr">119 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
 <span id="L120" class="LineNr">120 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L121" class="LineNr">121 </span>  assume-resources [
-<span id="L122" class="LineNr">122 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L123" class="LineNr">123 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L124" class="LineNr">124 </span><span class="Constant">      |  get 123:num, foo:offset|</span>
-<span id="L125" class="LineNr">125 </span><span class="Constant">      |]</span>|
-<span id="L126" class="LineNr">126 </span>    ]
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L124" class="LineNr">124 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  get 123:num, foo:offset|</span>
+<span id="L125" class="LineNr">125 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> ]
 <span id="L127" class="LineNr">127 </span>  ]
 <span id="L128" class="LineNr">128 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L129" class="LineNr">129 </span>  <a href='004-programming-environment.mu.html#L445'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L123'>render</a>
 <span id="L130" class="LineNr">130 </span>  screen-should-contain [
-<span id="L131" class="LineNr">131 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L132" class="LineNr">132 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L133" class="LineNr">133 </span>   <span class="Constant"> .  get 123:num, foo:offset                         ╎─────────────────────────────────────────────────.</span>
-<span id="L134" class="LineNr">134 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L135" class="LineNr">135 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L136" class="LineNr">136 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L137" class="LineNr">137 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span><span class="Constant"> .  get 123:num, foo:offset                         ╎─────────────────────────────────────────────────.</span>
+<span id="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L138" class="LineNr">138 </span>  ]
 <span id="L139" class="LineNr">139 </span>  assume-console [
-<span id="L140" class="LineNr">140 </span>    press F4
+<span id="L140" class="LineNr">140 </span>  <span class="Conceal">¦</span> press F4
 <span id="L141" class="LineNr">141 </span>  ]
 <span id="L142" class="LineNr">142 </span>  run [
-<span id="L143" class="LineNr">143 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L143" class="LineNr">143 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L144" class="LineNr">144 </span>  ]
 <span id="L145" class="LineNr">145 </span>  screen-should-contain [
-<span id="L146" class="LineNr">146 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L147" class="LineNr">147 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L148" class="LineNr">148 </span>   <span class="Constant"> .  get 123:num, foo:offset                         ╎─────────────────────────────────────────────────.</span>
-<span id="L149" class="LineNr">149 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L150" class="LineNr">150 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L151" class="LineNr">151 </span>   <span class="Constant"> .foo: unknown element 'foo' in container 'number'  ╎                                                 .</span>
-<span id="L152" class="LineNr">152 </span>   <span class="Constant"> .foo: first ingredient of 'get' should be a contai↩╎                                                 .</span>
-<span id="L153" class="LineNr">153 </span>   <span class="Constant"> .ner, but got '123:num'                            ╎                                                 .</span>
-<span id="L154" class="LineNr">154 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L155" class="LineNr">155 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span><span class="Constant"> .  get 123:num, foo:offset                         ╎─────────────────────────────────────────────────.</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: unknown element 'foo' in container 'number'  ╎                                                 .</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: first ingredient of 'get' should be a contai↩╎                                                 .</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span><span class="Constant"> .ner, but got '123:num'                            ╎                                                 .</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L156" class="LineNr">156 </span>  ]
 <span id="L157" class="LineNr">157 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
-<span id="L158" class="LineNr">158 </span>   <span class="Constant"> .  errors found                                                                                      .</span>
-<span id="L159" class="LineNr">159 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L160" class="LineNr">160 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L161" class="LineNr">161 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L162" class="LineNr">162 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L163" class="LineNr">163 </span>   <span class="Constant"> .foo: unknown element 'foo' in container 'number'                                                    .</span>
-<span id="L164" class="LineNr">164 </span>   <span class="Constant"> .foo: first ingredient of 'get' should be a contai                                                   .</span>
-<span id="L165" class="LineNr">165 </span>   <span class="Constant"> .ner, but got '123:num'                                                                              .</span>
-<span id="L166" class="LineNr">166 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                                      .</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: unknown element 'foo' in container 'number'                                                    .</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: first ingredient of 'get' should be a contai                                                   .</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span><span class="Constant"> .ner, but got '123:num'                                                                              .</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L167" class="LineNr">167 </span>  ]
 <span id="L168" class="LineNr">168 </span>]
 <span id="L169" class="LineNr">169 </span>
@@ -236,20 +237,20 @@ if ('onhashchange' in window) {
 <span id="L175" class="LineNr">175 </span>  ]
 <span id="L176" class="LineNr">176 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[]</span>
 <span id="L177" class="LineNr">177 </span>  assume-console [
-<span id="L178" class="LineNr">178 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 80</span>
-<span id="L179" class="LineNr">179 </span>    <span class="Comment"># create invalid sandbox 1</span>
-<span id="L180" class="LineNr">180 </span>    type <span class="Constant">[get foo, x:offset]</span>
-<span id="L181" class="LineNr">181 </span>    press F4
-<span id="L182" class="LineNr">182 </span>    <span class="Comment"># create invalid sandbox 0</span>
-<span id="L183" class="LineNr">183 </span>    type <span class="Constant">[get foo, x:offset]</span>
-<span id="L184" class="LineNr">184 </span>    press F4
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 80</span>
+<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Comment"># create invalid sandbox 1</span>
+<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> type <span class="Constant">[get foo, x:offset]</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> press F4
+<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Comment"># create invalid sandbox 0</span>
+<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> type <span class="Constant">[get foo, x:offset]</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> press F4
 <span id="L185" class="LineNr">185 </span>  ]
 <span id="L186" class="LineNr">186 </span>  run [
-<span id="L187" class="LineNr">187 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L188" class="LineNr">188 </span>  ]
 <span id="L189" class="LineNr">189 </span>  <span class="Comment"># status line shows that error is in first sandbox</span>
 <span id="L190" class="LineNr">190 </span>  screen-should-contain [
-<span id="L191" class="LineNr">191 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
 <span id="L192" class="LineNr">192 </span>  ]
 <span id="L193" class="LineNr">193 </span>]
 <span id="L194" class="LineNr">194 </span>
@@ -261,23 +262,23 @@ if ('onhashchange' in window) {
 <span id="L200" class="LineNr">200 </span>  ]
 <span id="L201" class="LineNr">201 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[]</span>
 <span id="L202" class="LineNr">202 </span>  assume-console [
-<span id="L203" class="LineNr">203 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 80</span>
-<span id="L204" class="LineNr">204 </span>    <span class="Comment"># create invalid sandbox 2</span>
-<span id="L205" class="LineNr">205 </span>    type <span class="Constant">[get foo, x:offset]</span>
-<span id="L206" class="LineNr">206 </span>    press F4
-<span id="L207" class="LineNr">207 </span>    <span class="Comment"># create invalid sandbox 1</span>
-<span id="L208" class="LineNr">208 </span>    type <span class="Constant">[get foo, x:offset]</span>
-<span id="L209" class="LineNr">209 </span>    press F4
-<span id="L210" class="LineNr">210 </span>    <span class="Comment"># create valid sandbox 0</span>
-<span id="L211" class="LineNr">211 </span>    type <span class="Constant">[add 2, 2]</span>
-<span id="L212" class="LineNr">212 </span>    press F4
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 80</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Comment"># create invalid sandbox 2</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> type <span class="Constant">[get foo, x:offset]</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> press F4
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Comment"># create invalid sandbox 1</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> type <span class="Constant">[get foo, x:offset]</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> press F4
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> <span class="Comment"># create valid sandbox 0</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> press F4
 <span id="L213" class="LineNr">213 </span>  ]
 <span id="L214" class="LineNr">214 </span>  run [
-<span id="L215" class="LineNr">215 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L216" class="LineNr">216 </span>  ]
 <span id="L217" class="LineNr">217 </span>  <span class="Comment"># status line shows that error is in second sandbox</span>
 <span id="L218" class="LineNr">218 </span>  screen-should-contain [
-<span id="L219" class="LineNr">219 </span>   <span class="Constant"> .  errors found (1)                                                               run (F4)           .</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (1)                                                               run (F4)           .</span>
 <span id="L220" class="LineNr">220 </span>  ]
 <span id="L221" class="LineNr">221 </span>]
 <span id="L222" class="LineNr">222 </span>
@@ -289,28 +290,28 @@ if ('onhashchange' in window) {
 <span id="L228" class="LineNr">228 </span>  ]
 <span id="L229" class="LineNr">229 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[get foo, x:offset]</span>  <span class="Comment"># invalid</span>
 <span id="L230" class="LineNr">230 </span>  assume-console [
-<span id="L231" class="LineNr">231 </span>    press F4  <span class="Comment"># generate error</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> press F4  <span class="Comment"># generate error</span>
 <span id="L232" class="LineNr">232 </span>  ]
 <span id="L233" class="LineNr">233 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L234" class="LineNr">234 </span>  assume-console [
-<span id="L235" class="LineNr">235 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 58</span>
-<span id="L236" class="LineNr">236 </span>    press ctrl-k
-<span id="L237" class="LineNr">237 </span>    type <span class="Constant">[add 2, 2]</span>  <span class="Comment"># valid code</span>
-<span id="L238" class="LineNr">238 </span>    press F4  <span class="Comment"># update sandbox</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 58</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> press ctrl-k
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>  <span class="Comment"># valid code</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> press F4  <span class="Comment"># update sandbox</span>
 <span id="L239" class="LineNr">239 </span>  ]
 <span id="L240" class="LineNr">240 </span>  run [
-<span id="L241" class="LineNr">241 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L242" class="LineNr">242 </span>  ]
 <span id="L243" class="LineNr">243 </span>  <span class="Comment"># error should disappear</span>
 <span id="L244" class="LineNr">244 </span>  screen-should-contain [
-<span id="L245" class="LineNr">245 </span>   <span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L246" class="LineNr">246 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L247" class="LineNr">247 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L248" class="LineNr">248 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L249" class="LineNr">249 </span>   <span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L250" class="LineNr">250 </span>   <span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L251" class="LineNr">251 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L252" class="LineNr">252 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L247" class="LineNr">247 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L253" class="LineNr">253 </span>  ]
 <span id="L254" class="LineNr">254 </span>]
 <span id="L255" class="LineNr">255 </span>
@@ -320,51 +321,51 @@ if ('onhashchange' in window) {
 <span id="L259" class="LineNr">259 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L260" class="LineNr">260 </span>  <span class="Comment"># define a shape-shifting recipe with an error</span>
 <span id="L261" class="LineNr">261 </span>  assume-resources [
-<span id="L262" class="LineNr">262 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L263" class="LineNr">263 </span>      <span class="Constant">|recipe</span> foo x:_elem<span class="muRecipe"> -&gt; </span>z:_elem <span class="Constant">[|</span>
-<span id="L264" class="LineNr">264 </span><span class="Constant">      |  local-scope|</span>
-<span id="L265" class="LineNr">265 </span><span class="Constant">      |  load-ingredients|</span>
-<span id="L266" class="LineNr">266 </span><span class="Constant">      |  y:&amp;:num &lt;- copy 0|</span>
-<span id="L267" class="LineNr">267 </span><span class="Constant">      |  z &lt;- add x, y|</span>
-<span id="L268" class="LineNr">268 </span><span class="Constant">      |]</span>|
-<span id="L269" class="LineNr">269 </span>    ]
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo x:_elem<span class="muRecipe"> -&gt; </span>z:_elem <span class="Constant">[|</span>
+<span id="L264" class="LineNr">264 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  local-scope|</span>
+<span id="L265" class="LineNr">265 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  load-ingredients|</span>
+<span id="L266" class="LineNr">266 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  y:&amp;:num &lt;- copy 0|</span>
+<span id="L267" class="LineNr">267 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  z &lt;- add x, y|</span>
+<span id="L268" class="LineNr">268 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span> ]
 <span id="L270" class="LineNr">270 </span>  ]
 <span id="L271" class="LineNr">271 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo 2]</span>
 <span id="L272" class="LineNr">272 </span>  assume-console [
-<span id="L273" class="LineNr">273 </span>    press F4
+<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> press F4
 <span id="L274" class="LineNr">274 </span>  ]
 <span id="L275" class="LineNr">275 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L276" class="LineNr">276 </span>  screen-should-contain [
-<span id="L277" class="LineNr">277 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L278" class="LineNr">278 </span>   <span class="Constant"> .recipe foo x:_elem -&gt; z:_elem [                   ╎                                                 .</span>
-<span id="L279" class="LineNr">279 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L280" class="LineNr">280 </span>   <span class="Constant"> .  load-ingredients                                ╎0   edit          copy            delete         .</span>
-<span id="L281" class="LineNr">281 </span>   <span class="Constant"> .  y:&amp;:num &lt;- copy 0                               ╎foo 2                                            .</span>
-<span id="L282" class="LineNr">282 </span>   <span class="Constant"> .  z &lt;- add x, y                                   ╎foo_2: 'add' requires number ingredients, but go↩.</span>
-<span id="L283" class="LineNr">283 </span>   <span class="Constant"> .]                                                 ╎t 'y'                                            .</span>
-<span id="L284" class="LineNr">284 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L285" class="LineNr">285 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L286" class="LineNr">286 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo x:_elem -&gt; z:_elem [                   ╎                                                 .</span>
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span><span class="Constant"> .  load-ingredients                                ╎0   edit          copy            delete         .</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span><span class="Constant"> .  y:&amp;:num &lt;- copy 0                               ╎foo 2                                            .</span>
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span><span class="Constant"> .  z &lt;- add x, y                                   ╎foo_2: 'add' requires number ingredients, but go↩.</span>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎t 'y'                                            .</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L287" class="LineNr">287 </span>  ]
 <span id="L288" class="LineNr">288 </span>  <span class="Comment"># now rerun everything</span>
 <span id="L289" class="LineNr">289 </span>  assume-console [
-<span id="L290" class="LineNr">290 </span>    press F4
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> press F4
 <span id="L291" class="LineNr">291 </span>  ]
 <span id="L292" class="LineNr">292 </span>  run [
-<span id="L293" class="LineNr">293 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L294" class="LineNr">294 </span>  ]
 <span id="L295" class="LineNr">295 </span>  <span class="Comment"># error should remain unchanged</span>
 <span id="L296" class="LineNr">296 </span>  screen-should-contain [
-<span id="L297" class="LineNr">297 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L298" class="LineNr">298 </span>   <span class="Constant"> .recipe foo x:_elem -&gt; z:_elem [                   ╎                                                 .</span>
-<span id="L299" class="LineNr">299 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L300" class="LineNr">300 </span>   <span class="Constant"> .  load-ingredients                                ╎0   edit          copy            delete         .</span>
-<span id="L301" class="LineNr">301 </span>   <span class="Constant"> .  y:&amp;:num &lt;- copy 0                               ╎foo 2                                            .</span>
-<span id="L302" class="LineNr">302 </span>   <span class="Constant"> .  z &lt;- add x, y                                   ╎foo_3: 'add' requires number ingredients, but go↩.</span>
-<span id="L303" class="LineNr">303 </span>   <span class="Constant"> .]                                                 ╎t 'y'                                            .</span>
-<span id="L304" class="LineNr">304 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L305" class="LineNr">305 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L306" class="LineNr">306 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L297" class="LineNr">297 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo x:_elem -&gt; z:_elem [                   ╎                                                 .</span>
+<span id="L299" class="LineNr">299 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L300" class="LineNr">300 </span>  <span class="Conceal">¦</span><span class="Constant"> .  load-ingredients                                ╎0   edit          copy            delete         .</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span><span class="Constant"> .  y:&amp;:num &lt;- copy 0                               ╎foo 2                                            .</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span><span class="Constant"> .  z &lt;- add x, y                                   ╎foo_3: 'add' requires number ingredients, but go↩.</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎t 'y'                                            .</span>
+<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L307" class="LineNr">307 </span>  ]
 <span id="L308" class="LineNr">308 </span>]
 <span id="L309" class="LineNr">309 </span>
@@ -374,10 +375,10 @@ if ('onhashchange' in window) {
 <span id="L313" class="LineNr">313 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L314" class="LineNr">314 </span>  <span class="Comment"># overload a well-known shape-shifting recipe</span>
 <span id="L315" class="LineNr">315 </span>  assume-resources [
-<span id="L316" class="LineNr">316 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L317" class="LineNr">317 </span>      <span class="Constant">|recipe</span> length l:&amp;:list:_elem<span class="muRecipe"> -&gt; </span>n:num <span class="Constant">[|</span>
-<span id="L318" class="LineNr">318 </span><span class="Constant">      |]</span>|
-<span id="L319" class="LineNr">319 </span>    ]
+<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> length l:&amp;:list:_elem<span class="muRecipe"> -&gt; </span>n:num <span class="Constant">[|</span>
+<span id="L318" class="LineNr">318 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span> ]
 <span id="L320" class="LineNr">320 </span>  ]
 <span id="L321" class="LineNr">321 </span>  <span class="Comment"># call code that uses other variants of it, but not it itself</span>
 <span id="L322" class="LineNr">322 </span>  test-sandbox:text <span class="Special">&lt;-</span> new <span class="Constant">[x:&amp;:list:num &lt;- copy 0</span>
@@ -385,51 +386,51 @@ if ('onhashchange' in window) {
 <span id="L324" class="LineNr">324 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, test-sandbox
 <span id="L325" class="LineNr">325 </span>  <span class="Comment"># run it once</span>
 <span id="L326" class="LineNr">326 </span>  assume-console [
-<span id="L327" class="LineNr">327 </span>    press F4
+<span id="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span> press F4
 <span id="L328" class="LineNr">328 </span>  ]
 <span id="L329" class="LineNr">329 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L330" class="LineNr">330 </span>  <span class="Comment"># no errors anywhere on screen (can't check anything else, since to-text will return an address)</span>
 <span id="L331" class="LineNr">331 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
-<span id="L332" class="LineNr">332 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L333" class="LineNr">333 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L334" class="LineNr">334 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L335" class="LineNr">335 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L336" class="LineNr">336 </span>   <span class="Constant"> .                                                                &lt;-                                  .</span>
-<span id="L337" class="LineNr">337 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L338" class="LineNr">338 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L339" class="LineNr">339 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L340" class="LineNr">340 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L341" class="LineNr">341 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L342" class="LineNr">342 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L343" class="LineNr">343 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L344" class="LineNr">344 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L345" class="LineNr">345 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L346" class="LineNr">346 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L332" class="LineNr">332 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L333" class="LineNr">333 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L335" class="LineNr">335 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L336" class="LineNr">336 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                &lt;-                                  .</span>
+<span id="L337" class="LineNr">337 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L340" class="LineNr">340 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L344" class="LineNr">344 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L347" class="LineNr">347 </span>  ]
 <span id="L348" class="LineNr">348 </span>  <span class="Comment"># rerun everything</span>
 <span id="L349" class="LineNr">349 </span>  assume-console [
-<span id="L350" class="LineNr">350 </span>    press F4
+<span id="L350" class="LineNr">350 </span>  <span class="Conceal">¦</span> press F4
 <span id="L351" class="LineNr">351 </span>  ]
 <span id="L352" class="LineNr">352 </span>  run [
-<span id="L353" class="LineNr">353 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L353" class="LineNr">353 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L354" class="LineNr">354 </span>  ]
 <span id="L355" class="LineNr">355 </span>  <span class="Comment"># still no errors</span>
 <span id="L356" class="LineNr">356 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
-<span id="L357" class="LineNr">357 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L358" class="LineNr">358 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L359" class="LineNr">359 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L360" class="LineNr">360 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L361" class="LineNr">361 </span>   <span class="Constant"> .                                                                &lt;-                                  .</span>
-<span id="L362" class="LineNr">362 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L363" class="LineNr">363 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L364" class="LineNr">364 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L365" class="LineNr">365 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L366" class="LineNr">366 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L367" class="LineNr">367 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L368" class="LineNr">368 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L369" class="LineNr">369 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L370" class="LineNr">370 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L371" class="LineNr">371 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                &lt;-                                  .</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L372" class="LineNr">372 </span>  ]
 <span id="L373" class="LineNr">373 </span>]
 <span id="L374" class="LineNr">374 </span>
@@ -438,29 +439,29 @@ if ('onhashchange' in window) {
 <span id="L377" class="LineNr">377 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
 <span id="L378" class="LineNr">378 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L379" class="LineNr">379 </span>  assume-resources [
-<span id="L380" class="LineNr">380 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L381" class="LineNr">381 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L382" class="LineNr">382 </span><span class="Constant">      |  x &lt;- copy 0|</span>
-<span id="L383" class="LineNr">383 </span><span class="Constant">      |]</span>|
-<span id="L384" class="LineNr">384 </span>    ]
+<span id="L380" class="LineNr">380 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L381" class="LineNr">381 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L382" class="LineNr">382 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  x &lt;- copy 0|</span>
+<span id="L383" class="LineNr">383 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span> ]
 <span id="L385" class="LineNr">385 </span>  ]
 <span id="L386" class="LineNr">386 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L387" class="LineNr">387 </span>  assume-console [
-<span id="L388" class="LineNr">388 </span>    press F4
+<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span> press F4
 <span id="L389" class="LineNr">389 </span>  ]
 <span id="L390" class="LineNr">390 </span>  run [
-<span id="L391" class="LineNr">391 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L391" class="LineNr">391 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L392" class="LineNr">392 </span>  ]
 <span id="L393" class="LineNr">393 </span>  screen-should-contain [
-<span id="L394" class="LineNr">394 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L395" class="LineNr">395 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L396" class="LineNr">396 </span>   <span class="Constant"> .  x &lt;- copy 0                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L397" class="LineNr">397 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L398" class="LineNr">398 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L399" class="LineNr">399 </span>   <span class="Constant"> .foo: missing type for 'x' in 'x &lt;- copy 0'        ╎                                                 .</span>
-<span id="L400" class="LineNr">400 </span>   <span class="Constant"> .foo: can't copy '0' to 'x'; types don't match     ╎                                                 .</span>
-<span id="L401" class="LineNr">401 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L402" class="LineNr">402 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span><span class="Constant"> .  x &lt;- copy 0                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: missing type for 'x' in 'x &lt;- copy 0'        ╎                                                 .</span>
+<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: can't copy '0' to 'x'; types don't match     ╎                                                 .</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L403" class="LineNr">403 </span>  ]
 <span id="L404" class="LineNr">404 </span>]
 <span id="L405" class="LineNr">405 </span>
@@ -470,26 +471,26 @@ if ('onhashchange' in window) {
 <span id="L409" class="LineNr">409 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L410" class="LineNr">410 </span>  <span class="Comment"># recipe is incomplete (unbalanced '[')</span>
 <span id="L411" class="LineNr">411 </span>  assume-resources [
-<span id="L412" class="LineNr">412 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L413" class="LineNr">413 </span>      <span class="Constant">|recipe</span> foo \\\<span class="Constant">[|</span>
-<span id="L414" class="LineNr">414 </span><span class="Constant">      |  x &lt;- copy 0|</span>
-<span id="L415" class="LineNr">415 </span><span class="Constant">    ]</span>
+<span id="L412" class="LineNr">412 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo \\\<span class="Constant">[|</span>
+<span id="L414" class="LineNr">414 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  x &lt;- copy 0|</span>
+<span id="L415" class="LineNr">415 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> ]</span>
 <span id="L416" class="LineNr">416 </span>  ]
 <span id="L417" class="LineNr">417 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L418" class="LineNr">418 </span>  assume-console [
-<span id="L419" class="LineNr">419 </span>    press F4
+<span id="L419" class="LineNr">419 </span>  <span class="Conceal">¦</span> press F4
 <span id="L420" class="LineNr">420 </span>  ]
 <span id="L421" class="LineNr">421 </span>  run [
-<span id="L422" class="LineNr">422 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L423" class="LineNr">423 </span>  ]
 <span id="L424" class="LineNr">424 </span>  screen-should-contain [
-<span id="L425" class="LineNr">425 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L426" class="LineNr">426 </span>   <span class="Constant"> .recipe foo \\[                                      ╎foo                                              .</span>
-<span id="L427" class="LineNr">427 </span>   <span class="Constant"> .  x &lt;- copy 0                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L428" class="LineNr">428 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L429" class="LineNr">429 </span>   <span class="Constant"> .9: unbalanced '\\[' for recipe                      ╎                                                 .</span>
-<span id="L430" class="LineNr">430 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L431" class="LineNr">431 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo \\[                                      ╎foo                                              .</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span><span class="Constant"> .  x &lt;- copy 0                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span><span class="Constant"> .9: unbalanced '\\[' for recipe                      ╎                                                 .</span>
+<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L432" class="LineNr">432 </span>  ]
 <span id="L433" class="LineNr">433 </span>]
 <span id="L434" class="LineNr">434 </span>
@@ -498,33 +499,33 @@ if ('onhashchange' in window) {
 <span id="L437" class="LineNr">437 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
 <span id="L438" class="LineNr">438 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L439" class="LineNr">439 </span>  assume-resources [
-<span id="L440" class="LineNr">440 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L441" class="LineNr">441 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L442" class="LineNr">442 </span><span class="Constant">      |  local-scope|</span>
-<span id="L443" class="LineNr">443 </span><span class="Constant">      |  x:&amp;:point &lt;- new point:type|</span>
-<span id="L444" class="LineNr">444 </span><span class="Constant">      |  get x:&amp;:point, 1:offset|</span>
-<span id="L445" class="LineNr">445 </span><span class="Constant">      |]</span>|
-<span id="L446" class="LineNr">446 </span>    ]
+<span id="L440" class="LineNr">440 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L441" class="LineNr">441 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L442" class="LineNr">442 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  local-scope|</span>
+<span id="L443" class="LineNr">443 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  x:&amp;:point &lt;- new point:type|</span>
+<span id="L444" class="LineNr">444 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  get x:&amp;:point, 1:offset|</span>
+<span id="L445" class="LineNr">445 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> ]
 <span id="L447" class="LineNr">447 </span>  ]
 <span id="L448" class="LineNr">448 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L449" class="LineNr">449 </span>  assume-console [
-<span id="L450" class="LineNr">450 </span>    press F4
+<span id="L450" class="LineNr">450 </span>  <span class="Conceal">¦</span> press F4
 <span id="L451" class="LineNr">451 </span>  ]
 <span id="L452" class="LineNr">452 </span>  run [
-<span id="L453" class="LineNr">453 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L454" class="LineNr">454 </span>  ]
 <span id="L455" class="LineNr">455 </span>  screen-should-contain [
-<span id="L456" class="LineNr">456 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L457" class="LineNr">457 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L458" class="LineNr">458 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L459" class="LineNr">459 </span>   <span class="Constant"> .  x:&amp;:point &lt;- new point:type                     ╎                                                 .</span>
-<span id="L460" class="LineNr">460 </span>   <span class="Constant"> .  get x:&amp;:point, 1:offset                         ╎                                                 .</span>
-<span id="L461" class="LineNr">461 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L462" class="LineNr">462 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L463" class="LineNr">463 </span>   <span class="Constant"> .foo: first ingredient of 'get' should be a contai↩╎                                                 .</span>
-<span id="L464" class="LineNr">464 </span>   <span class="Constant"> .ner, but got 'x:&amp;:point'                          ╎                                                 .</span>
-<span id="L465" class="LineNr">465 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L466" class="LineNr">466 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L457" class="LineNr">457 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span><span class="Constant"> .  x:&amp;:point &lt;- new point:type                     ╎                                                 .</span>
+<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span><span class="Constant"> .  get x:&amp;:point, 1:offset                         ╎                                                 .</span>
+<span id="L461" class="LineNr">461 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L462" class="LineNr">462 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: first ingredient of 'get' should be a contai↩╎                                                 .</span>
+<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span><span class="Constant"> .ner, but got 'x:&amp;:point'                          ╎                                                 .</span>
+<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L467" class="LineNr">467 </span>  ]
 <span id="L468" class="LineNr">468 </span>]
 <span id="L469" class="LineNr">469 </span>
@@ -533,35 +534,35 @@ if ('onhashchange' in window) {
 <span id="L472" class="LineNr">472 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
 <span id="L473" class="LineNr">473 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L474" class="LineNr">474 </span>  assume-resources [
-<span id="L475" class="LineNr">475 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L476" class="LineNr">476 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L477" class="LineNr">477 </span><span class="Constant">      |  local-scope|</span>
-<span id="L478" class="LineNr">478 </span><span class="Constant">      |  x:num &lt;- copy 0|</span>
-<span id="L479" class="LineNr">479 </span><span class="Constant">      |  y:&amp;:point &lt;- new point:type|</span>
-<span id="L480" class="LineNr">480 </span><span class="Constant">      |  get *y:&amp;:point, x:num|</span>
-<span id="L481" class="LineNr">481 </span><span class="Constant">      |]</span>|
-<span id="L482" class="LineNr">482 </span>    ]
+<span id="L475" class="LineNr">475 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L476" class="LineNr">476 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L477" class="LineNr">477 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  local-scope|</span>
+<span id="L478" class="LineNr">478 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  x:num &lt;- copy 0|</span>
+<span id="L479" class="LineNr">479 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  y:&amp;:point &lt;- new point:type|</span>
+<span id="L480" class="LineNr">480 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  get *y:&amp;:point, x:num|</span>
+<span id="L481" class="LineNr">481 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L482" class="LineNr">482 </span>  <span class="Conceal">¦</span> ]
 <span id="L483" class="LineNr">483 </span>  ]
 <span id="L484" class="LineNr">484 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L485" class="LineNr">485 </span>  assume-console [
-<span id="L486" class="LineNr">486 </span>    press F4
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span> press F4
 <span id="L487" class="LineNr">487 </span>  ]
 <span id="L488" class="LineNr">488 </span>  run [
-<span id="L489" class="LineNr">489 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L489" class="LineNr">489 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L490" class="LineNr">490 </span>  ]
 <span id="L491" class="LineNr">491 </span>  screen-should-contain [
-<span id="L492" class="LineNr">492 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L493" class="LineNr">493 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L494" class="LineNr">494 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L495" class="LineNr">495 </span>   <span class="Constant"> .  x:num &lt;- copy 0                                 ╎                                                 .</span>
-<span id="L496" class="LineNr">496 </span>   <span class="Constant"> .  y:&amp;:point &lt;- new point:type                     ╎                                                 .</span>
-<span id="L497" class="LineNr">497 </span>   <span class="Constant"> .  get *y:&amp;:point, x:num                           ╎                                                 .</span>
-<span id="L498" class="LineNr">498 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L499" class="LineNr">499 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L500" class="LineNr">500 </span>   <span class="Constant"> .foo: second ingredient of 'get' should have type ↩╎                                                 .</span>
-<span id="L501" class="LineNr">501 </span>   <span class="Constant"> .'offset', but got 'x:num'                         ╎                                                 .</span>
-<span id="L502" class="LineNr">502 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L503" class="LineNr">503 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L492" class="LineNr">492 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L493" class="LineNr">493 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span><span class="Constant"> .  x:num &lt;- copy 0                                 ╎                                                 .</span>
+<span id="L496" class="LineNr">496 </span>  <span class="Conceal">¦</span><span class="Constant"> .  y:&amp;:point &lt;- new point:type                     ╎                                                 .</span>
+<span id="L497" class="LineNr">497 </span>  <span class="Conceal">¦</span><span class="Constant"> .  get *y:&amp;:point, x:num                           ╎                                                 .</span>
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: second ingredient of 'get' should have type ↩╎                                                 .</span>
+<span id="L501" class="LineNr">501 </span>  <span class="Conceal">¦</span><span class="Constant"> .'offset', but got 'x:num'                         ╎                                                 .</span>
+<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L503" class="LineNr">503 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L504" class="LineNr">504 </span>  ]
 <span id="L505" class="LineNr">505 </span>]
 <span id="L506" class="LineNr">506 </span>
@@ -571,48 +572,48 @@ if ('onhashchange' in window) {
 <span id="L510" class="LineNr">510 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">15/height</span>
 <span id="L511" class="LineNr">511 </span>  <span class="Comment"># try to run a file with an error</span>
 <span id="L512" class="LineNr">512 </span>  assume-resources [
-<span id="L513" class="LineNr">513 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L514" class="LineNr">514 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L515" class="LineNr">515 </span><span class="Constant">      |  local-scope|</span>
-<span id="L516" class="LineNr">516 </span><span class="Constant">      |  x:num &lt;- copy y:num|</span>
-<span id="L517" class="LineNr">517 </span><span class="Constant">      |]</span>|
-<span id="L518" class="LineNr">518 </span>    ]
+<span id="L513" class="LineNr">513 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L514" class="LineNr">514 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L515" class="LineNr">515 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  local-scope|</span>
+<span id="L516" class="LineNr">516 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  x:num &lt;- copy y:num|</span>
+<span id="L517" class="LineNr">517 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> ]
 <span id="L519" class="LineNr">519 </span>  ]
 <span id="L520" class="LineNr">520 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L521" class="LineNr">521 </span>  assume-console [
-<span id="L522" class="LineNr">522 </span>    press F4
+<span id="L522" class="LineNr">522 </span>  <span class="Conceal">¦</span> press F4
 <span id="L523" class="LineNr">523 </span>  ]
 <span id="L524" class="LineNr">524 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L525" class="LineNr">525 </span>  screen-should-contain [
-<span id="L526" class="LineNr">526 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L527" class="LineNr">527 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L528" class="LineNr">528 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L529" class="LineNr">529 </span>   <span class="Constant"> .  x:num &lt;- copy y:num                             ╎                                                 .</span>
-<span id="L530" class="LineNr">530 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L531" class="LineNr">531 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L532" class="LineNr">532 </span>   <span class="Constant"> .foo: tried to read ingredient 'y' in 'x:num &lt;- co↩╎                                                 .</span>
-<span id="L533" class="LineNr">533 </span>   <span class="Constant"> .py y:num' but it hasn't been written to yet       ╎                                                 .</span>
-<span id="L534" class="LineNr">534 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L535" class="LineNr">535 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L526" class="LineNr">526 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L527" class="LineNr">527 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L528" class="LineNr">528 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L529" class="LineNr">529 </span>  <span class="Conceal">¦</span><span class="Constant"> .  x:num &lt;- copy y:num                             ╎                                                 .</span>
+<span id="L530" class="LineNr">530 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L531" class="LineNr">531 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L532" class="LineNr">532 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: tried to read ingredient 'y' in 'x:num &lt;- co↩╎                                                 .</span>
+<span id="L533" class="LineNr">533 </span>  <span class="Conceal">¦</span><span class="Constant"> .py y:num' but it hasn't been written to yet       ╎                                                 .</span>
+<span id="L534" class="LineNr">534 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L536" class="LineNr">536 </span>  ]
 <span id="L537" class="LineNr">537 </span>  <span class="Comment"># rerun the file, check for the same error</span>
 <span id="L538" class="LineNr">538 </span>  assume-console [
-<span id="L539" class="LineNr">539 </span>    press F4
+<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> press F4
 <span id="L540" class="LineNr">540 </span>  ]
 <span id="L541" class="LineNr">541 </span>  run [
-<span id="L542" class="LineNr">542 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L542" class="LineNr">542 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L543" class="LineNr">543 </span>  ]
 <span id="L544" class="LineNr">544 </span>  screen-should-contain [
-<span id="L545" class="LineNr">545 </span>   <span class="Constant"> .  errors found                                                                   run (F4)           .</span>
-<span id="L546" class="LineNr">546 </span>   <span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
-<span id="L547" class="LineNr">547 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L548" class="LineNr">548 </span>   <span class="Constant"> .  x:num &lt;- copy y:num                             ╎                                                 .</span>
-<span id="L549" class="LineNr">549 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L550" class="LineNr">550 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L551" class="LineNr">551 </span>   <span class="Constant"> .foo: tried to read ingredient 'y' in 'x:num &lt;- co↩╎                                                 .</span>
-<span id="L552" class="LineNr">552 </span>   <span class="Constant"> .py y:num' but it hasn't been written to yet       ╎                                                 .</span>
-<span id="L553" class="LineNr">553 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L554" class="LineNr">554 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L545" class="LineNr">545 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found                                                                   run (F4)           .</span>
+<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎foo                                              .</span>
+<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L548" class="LineNr">548 </span>  <span class="Conceal">¦</span><span class="Constant"> .  x:num &lt;- copy y:num                             ╎                                                 .</span>
+<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L550" class="LineNr">550 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L551" class="LineNr">551 </span>  <span class="Conceal">¦</span><span class="Constant"> .foo: tried to read ingredient 'y' in 'x:num &lt;- co↩╎                                                 .</span>
+<span id="L552" class="LineNr">552 </span>  <span class="Conceal">¦</span><span class="Constant"> .py y:num' but it hasn't been written to yet       ╎                                                 .</span>
+<span id="L553" class="LineNr">553 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L554" class="LineNr">554 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L555" class="LineNr">555 </span>  ]
 <span id="L556" class="LineNr">556 </span>]
 <span id="L557" class="LineNr">557 </span>
@@ -625,56 +626,56 @@ if ('onhashchange' in window) {
 <span id="L564" class="LineNr">564 </span>  <span class="Comment"># sandbox editor contains an illegal instruction</span>
 <span id="L565" class="LineNr">565 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[get 1234:num, foo:offset]</span>
 <span id="L566" class="LineNr">566 </span>  assume-console [
-<span id="L567" class="LineNr">567 </span>    press F4
+<span id="L567" class="LineNr">567 </span>  <span class="Conceal">¦</span> press F4
 <span id="L568" class="LineNr">568 </span>  ]
 <span id="L569" class="LineNr">569 </span>  run [
-<span id="L570" class="LineNr">570 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L570" class="LineNr">570 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L571" class="LineNr">571 </span>  ]
 <span id="L572" class="LineNr">572 </span>  <span class="Comment"># check that screen prints error message in red</span>
 <span id="L573" class="LineNr">573 </span>  screen-should-contain [
-<span id="L574" class="LineNr">574 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L575" class="LineNr">575 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L576" class="LineNr">576 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L577" class="LineNr">577 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L578" class="LineNr">578 </span>   <span class="Constant"> .                                                  ╎get 1234:num, foo:offset                         .</span>
-<span id="L579" class="LineNr">579 </span>   <span class="Constant"> .                                                  ╎unknown element 'foo' in container 'number'      .</span>
-<span id="L580" class="LineNr">580 </span>   <span class="Constant"> .                                                  ╎first ingredient of 'get' should be a container,↩.</span>
-<span id="L581" class="LineNr">581 </span>   <span class="Constant"> .                                                  ╎ but got '1234:num'                              .</span>
-<span id="L582" class="LineNr">582 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L583" class="LineNr">583 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L574" class="LineNr">574 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L575" class="LineNr">575 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L576" class="LineNr">576 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L577" class="LineNr">577 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L578" class="LineNr">578 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎get 1234:num, foo:offset                         .</span>
+<span id="L579" class="LineNr">579 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎unknown element 'foo' in container 'number'      .</span>
+<span id="L580" class="LineNr">580 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎first ingredient of 'get' should be a container,↩.</span>
+<span id="L581" class="LineNr">581 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎ but got '1234:num'                              .</span>
+<span id="L582" class="LineNr">582 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L583" class="LineNr">583 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L584" class="LineNr">584 </span>  ]
 <span id="L585" class="LineNr">585 </span>  screen-should-contain-in-color <span class="Constant">7/white</span>, [
-<span id="L586" class="LineNr">586 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L587" class="LineNr">587 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L588" class="LineNr">588 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L589" class="LineNr">589 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L590" class="LineNr">590 </span>   <span class="Constant"> .                                                   get 1234:num, foo:offset                         .</span>
-<span id="L591" class="LineNr">591 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L592" class="LineNr">592 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L593" class="LineNr">593 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L586" class="LineNr">586 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L587" class="LineNr">587 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L588" class="LineNr">588 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L589" class="LineNr">589 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L590" class="LineNr">590 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   get 1234:num, foo:offset                         .</span>
+<span id="L591" class="LineNr">591 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L592" class="LineNr">592 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L593" class="LineNr">593 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L594" class="LineNr">594 </span>  ]
 <span id="L595" class="LineNr">595 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
-<span id="L596" class="LineNr">596 </span>   <span class="Constant"> .  errors found (0)                                                                                  .</span>
-<span id="L597" class="LineNr">597 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L598" class="LineNr">598 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L599" class="LineNr">599 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L600" class="LineNr">600 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L601" class="LineNr">601 </span>   <span class="Constant"> .                                                   unknown element 'foo' in container 'number'      .</span>
-<span id="L602" class="LineNr">602 </span>   <span class="Constant"> .                                                   first ingredient of 'get' should be a container, .</span>
-<span id="L603" class="LineNr">603 </span>   <span class="Constant"> .                                                    but got '1234:num'                              .</span>
-<span id="L604" class="LineNr">604 </span>   <span class="Constant"> .                                                                                                    .</span>
+<span id="L596" class="LineNr">596 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                                                  .</span>
+<span id="L597" class="LineNr">597 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L598" class="LineNr">598 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L599" class="LineNr">599 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L600" class="LineNr">600 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L601" class="LineNr">601 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   unknown element 'foo' in container 'number'      .</span>
+<span id="L602" class="LineNr">602 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                   first ingredient of 'get' should be a container, .</span>
+<span id="L603" class="LineNr">603 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                    but got '1234:num'                              .</span>
+<span id="L604" class="LineNr">604 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
 <span id="L605" class="LineNr">605 </span>  ]
 <span id="L606" class="LineNr">606 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span>, [
-<span id="L607" class="LineNr">607 </span>   <span class="Constant"> .                                                                                                    .</span>
-<span id="L608" class="LineNr">608 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L609" class="LineNr">609 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L610" class="LineNr">610 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L611" class="LineNr">611 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L612" class="LineNr">612 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L613" class="LineNr">613 </span>   <span class="Constant"> .                                                  ╎                                                ↩.</span>
-<span id="L614" class="LineNr">614 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L615" class="LineNr">615 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L616" class="LineNr">616 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L607" class="LineNr">607 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                                    .</span>
+<span id="L608" class="LineNr">608 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L609" class="LineNr">609 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L610" class="LineNr">610 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L611" class="LineNr">611 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L612" class="LineNr">612 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L613" class="LineNr">613 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                ↩.</span>
+<span id="L614" class="LineNr">614 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L615" class="LineNr">615 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L616" class="LineNr">616 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L617" class="LineNr">617 </span>  ]
 <span id="L618" class="LineNr">618 </span>]
 <span id="L619" class="LineNr">619 </span>
@@ -688,24 +689,24 @@ if ('onhashchange' in window) {
 <span id="L627" class="LineNr">627 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[get 1234:num, foo:offset]</span>
 <span id="L628" class="LineNr">628 </span>  <span class="Comment"># run the code in the editors multiple times</span>
 <span id="L629" class="LineNr">629 </span>  assume-console [
-<span id="L630" class="LineNr">630 </span>    press F4
-<span id="L631" class="LineNr">631 </span>    press F4
+<span id="L630" class="LineNr">630 </span>  <span class="Conceal">¦</span> press F4
+<span id="L631" class="LineNr">631 </span>  <span class="Conceal">¦</span> press F4
 <span id="L632" class="LineNr">632 </span>  ]
 <span id="L633" class="LineNr">633 </span>  run [
-<span id="L634" class="LineNr">634 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L634" class="LineNr">634 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L635" class="LineNr">635 </span>  ]
 <span id="L636" class="LineNr">636 </span>  <span class="Comment"># check that screen prints error message just once</span>
 <span id="L637" class="LineNr">637 </span>  screen-should-contain [
-<span id="L638" class="LineNr">638 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L639" class="LineNr">639 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L640" class="LineNr">640 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L641" class="LineNr">641 </span>   <span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L642" class="LineNr">642 </span>   <span class="Constant"> .                                                  ╎get 1234:num, foo:offset                         .</span>
-<span id="L643" class="LineNr">643 </span>   <span class="Constant"> .                                                  ╎unknown element 'foo' in container 'number'      .</span>
-<span id="L644" class="LineNr">644 </span>   <span class="Constant"> .                                                  ╎first ingredient of 'get' should be a container,↩.</span>
-<span id="L645" class="LineNr">645 </span>   <span class="Constant"> .                                                  ╎ but got '1234:num'                              .</span>
-<span id="L646" class="LineNr">646 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L647" class="LineNr">647 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L638" class="LineNr">638 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L639" class="LineNr">639 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L640" class="LineNr">640 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L641" class="LineNr">641 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L642" class="LineNr">642 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎get 1234:num, foo:offset                         .</span>
+<span id="L643" class="LineNr">643 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎unknown element 'foo' in container 'number'      .</span>
+<span id="L644" class="LineNr">644 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎first ingredient of 'get' should be a container,↩.</span>
+<span id="L645" class="LineNr">645 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎ but got '1234:num'                              .</span>
+<span id="L646" class="LineNr">646 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L647" class="LineNr">647 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L648" class="LineNr">648 </span>  ]
 <span id="L649" class="LineNr">649 </span>]
 <span id="L650" class="LineNr">650 </span>
@@ -715,32 +716,32 @@ if ('onhashchange' in window) {
 <span id="L654" class="LineNr">654 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">20/height</span>
 <span id="L655" class="LineNr">655 </span>  <span class="Comment"># sandbox editor will trigger an infinite loop</span>
 <span id="L656" class="LineNr">656 </span>  assume-resources [
-<span id="L657" class="LineNr">657 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L658" class="LineNr">658 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L659" class="LineNr">659 </span><span class="Constant">      |  {|</span>
-<span id="L660" class="LineNr">660 </span><span class="Constant">      |    loop|</span>
-<span id="L661" class="LineNr">661 </span><span class="Constant">      |  }|</span>
-<span id="L662" class="LineNr">662 </span><span class="Constant">      |]</span>|
-<span id="L663" class="LineNr">663 </span>    ]
+<span id="L657" class="LineNr">657 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L658" class="LineNr">658 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L659" class="LineNr">659 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  {|</span>
+<span id="L660" class="LineNr">660 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |    loop|</span>
+<span id="L661" class="LineNr">661 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  }|</span>
+<span id="L662" class="LineNr">662 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]</span>|
+<span id="L663" class="LineNr">663 </span>  <span class="Conceal">¦</span> ]
 <span id="L664" class="LineNr">664 </span>  ]
 <span id="L665" class="LineNr">665 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo]</span>
 <span id="L666" class="LineNr">666 </span>  <span class="Comment"># run the sandbox</span>
 <span id="L667" class="LineNr">667 </span>  assume-console [
-<span id="L668" class="LineNr">668 </span>    press F4
+<span id="L668" class="LineNr">668 </span>  <span class="Conceal">¦</span> press F4
 <span id="L669" class="LineNr">669 </span>  ]
 <span id="L670" class="LineNr">670 </span>  run [
-<span id="L671" class="LineNr">671 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L671" class="LineNr">671 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L672" class="LineNr">672 </span>  ]
 <span id="L673" class="LineNr">673 </span>  screen-should-contain [
-<span id="L674" class="LineNr">674 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L675" class="LineNr">675 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L676" class="LineNr">676 </span>   <span class="Constant"> .  {                                               ╎─────────────────────────────────────────────────.</span>
-<span id="L677" class="LineNr">677 </span>   <span class="Constant"> .    loop                                          ╎0   edit          copy            delete         .</span>
-<span id="L678" class="LineNr">678 </span>   <span class="Constant"> .  }                                               ╎foo                                              .</span>
-<span id="L679" class="LineNr">679 </span>   <span class="Constant"> .]                                                 ╎took too long!                                   .</span>
-<span id="L680" class="LineNr">680 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L681" class="LineNr">681 </span>   <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
-<span id="L682" class="LineNr">682 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L674" class="LineNr">674 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L675" class="LineNr">675 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L676" class="LineNr">676 </span>  <span class="Conceal">¦</span><span class="Constant"> .  {                                               ╎─────────────────────────────────────────────────.</span>
+<span id="L677" class="LineNr">677 </span>  <span class="Conceal">¦</span><span class="Constant"> .    loop                                          ╎0   edit          copy            delete         .</span>
+<span id="L678" class="LineNr">678 </span>  <span class="Conceal">¦</span><span class="Constant"> .  }                                               ╎foo                                              .</span>
+<span id="L679" class="LineNr">679 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎took too long!                                   .</span>
+<span id="L680" class="LineNr">680 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L681" class="LineNr">681 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎                                                 .</span>
+<span id="L682" class="LineNr">682 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L683" class="LineNr">683 </span>  ]
 <span id="L684" class="LineNr">684 </span>]
 <span id="L685" class="LineNr">685 </span>
@@ -750,55 +751,55 @@ if ('onhashchange' in window) {
 <span id="L689" class="LineNr">689 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
 <span id="L690" class="LineNr">690 </span>  <span class="Comment"># generate a stash and a error</span>
 <span id="L691" class="LineNr">691 </span>  assume-resources [
-<span id="L692" class="LineNr">692 </span>    <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L693" class="LineNr">693 </span>      <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
-<span id="L694" class="LineNr">694 </span><span class="Constant">      |  local-scope|</span>
-<span id="L695" class="LineNr">695 </span><span class="Constant">      |  a:num &lt;- next-ingredient|</span>
-<span id="L696" class="LineNr">696 </span><span class="Constant">      |  b:num &lt;- next-ingredient|</span>
-<span id="L697" class="LineNr">697 </span><span class="Constant">      |  stash [dividing by]</span>, b|
-<span id="L698" class="LineNr">698 </span>      <span class="Constant">|</span>  _, c:num <span class="Special">&lt;-</span> divide-with-remainder a, b|
-<span id="L699" class="LineNr">699 </span>      <span class="Constant">|</span>  <span class="muControl">reply</span> b|
-<span id="L700" class="LineNr">700 </span><span class="Constant">      |]|</span>
-<span id="L701" class="LineNr">701 </span>    ]
+<span id="L692" class="LineNr">692 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L693" class="LineNr">693 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|recipe</span> foo <span class="Constant">[|</span>
+<span id="L694" class="LineNr">694 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  local-scope|</span>
+<span id="L695" class="LineNr">695 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  a:num &lt;- next-ingredient|</span>
+<span id="L696" class="LineNr">696 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  b:num &lt;- next-ingredient|</span>
+<span id="L697" class="LineNr">697 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |  stash [dividing by]</span>, b|
+<span id="L698" class="LineNr">698 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|</span>  _, c:num <span class="Special">&lt;-</span> divide-with-remainder a, b|
+<span id="L699" class="LineNr">699 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">|</span>  <span class="muControl">reply</span> b|
+<span id="L700" class="LineNr">700 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |]|</span>
+<span id="L701" class="LineNr">701 </span>  <span class="Conceal">¦</span> ]
 <span id="L702" class="LineNr">702 </span>  ]
 <span id="L703" class="LineNr">703 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[foo 4, 0]</span>
 <span id="L704" class="LineNr">704 </span>  <span class="Comment"># run</span>
 <span id="L705" class="LineNr">705 </span>  assume-console [
-<span id="L706" class="LineNr">706 </span>    press F4
+<span id="L706" class="LineNr">706 </span>  <span class="Conceal">¦</span> press F4
 <span id="L707" class="LineNr">707 </span>  ]
 <span id="L708" class="LineNr">708 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L709" class="LineNr">709 </span>  <span class="Comment"># screen prints error message</span>
 <span id="L710" class="LineNr">710 </span>  screen-should-contain [
-<span id="L711" class="LineNr">711 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L712" class="LineNr">712 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L713" class="LineNr">713 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L714" class="LineNr">714 </span>   <span class="Constant"> .  a:num &lt;- next-ingredient                        ╎0   edit          copy            delete         .</span>
-<span id="L715" class="LineNr">715 </span>   <span class="Constant"> .  b:num &lt;- next-ingredient                        ╎foo 4, 0                                         .</span>
-<span id="L716" class="LineNr">716 </span>   <span class="Constant"> .  stash [dividing by], b                          ╎foo: divide by zero in '_, c:num &lt;- divide-with-↩.</span>
-<span id="L717" class="LineNr">717 </span>   <span class="Constant"> .  _, c:num &lt;- divide-with-remainder a, b          ╎remainder a, b'                                  .</span>
-<span id="L718" class="LineNr">718 </span>   <span class="Constant"> .  reply b                                         ╎─────────────────────────────────────────────────.</span>
-<span id="L719" class="LineNr">719 </span>   <span class="Constant"> .]                                                 ╎                                                 .</span>
-<span id="L720" class="LineNr">720 </span>   <span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L711" class="LineNr">711 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L712" class="LineNr">712 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L713" class="LineNr">713 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L714" class="LineNr">714 </span>  <span class="Conceal">¦</span><span class="Constant"> .  a:num &lt;- next-ingredient                        ╎0   edit          copy            delete         .</span>
+<span id="L715" class="LineNr">715 </span>  <span class="Conceal">¦</span><span class="Constant"> .  b:num &lt;- next-ingredient                        ╎foo 4, 0                                         .</span>
+<span id="L716" class="LineNr">716 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [dividing by], b                          ╎foo: divide by zero in '_, c:num &lt;- divide-with-↩.</span>
+<span id="L717" class="LineNr">717 </span>  <span class="Conceal">¦</span><span class="Constant"> .  _, c:num &lt;- divide-with-remainder a, b          ╎remainder a, b'                                  .</span>
+<span id="L718" class="LineNr">718 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply b                                         ╎─────────────────────────────────────────────────.</span>
+<span id="L719" class="LineNr">719 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎                                                 .</span>
+<span id="L720" class="LineNr">720 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
 <span id="L721" class="LineNr">721 </span>  ]
 <span id="L722" class="LineNr">722 </span>  <span class="Comment"># click on the call in the sandbox</span>
 <span id="L723" class="LineNr">723 </span>  assume-console [
-<span id="L724" class="LineNr">724 </span>    left-click<span class="Constant"> 4</span>,<span class="Constant"> 55</span>
+<span id="L724" class="LineNr">724 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 4</span>,<span class="Constant"> 55</span>
 <span id="L725" class="LineNr">725 </span>  ]
 <span id="L726" class="LineNr">726 </span>  run [
-<span id="L727" class="LineNr">727 </span>    <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
+<span id="L727" class="LineNr">727 </span>  <span class="Conceal">¦</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
 <span id="L728" class="LineNr">728 </span>  ]
 <span id="L729" class="LineNr">729 </span>  <span class="Comment"># screen should expand trace</span>
 <span id="L730" class="LineNr">730 </span>  screen-should-contain [
-<span id="L731" class="LineNr">731 </span>   <span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
-<span id="L732" class="LineNr">732 </span>   <span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
-<span id="L733" class="LineNr">733 </span>   <span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
-<span id="L734" class="LineNr">734 </span>   <span class="Constant"> .  a:num &lt;- next-ingredient                        ╎0   edit          copy            delete         .</span>
-<span id="L735" class="LineNr">735 </span>   <span class="Constant"> .  b:num &lt;- next-ingredient                        ╎foo 4, 0                                         .</span>
-<span id="L736" class="LineNr">736 </span>   <span class="Constant"> .  stash [dividing by], b                          ╎dividing by 0                                    .</span>
-<span id="L737" class="LineNr">737 </span>   <span class="Constant"> .  _, c:num &lt;- divide-with-remainder a, b          ╎14 instructions run                              .</span>
-<span id="L738" class="LineNr">738 </span>   <span class="Constant"> .  reply b                                         ╎foo: divide by zero in '_, c:num &lt;- divide-with-↩.</span>
-<span id="L739" class="LineNr">739 </span>   <span class="Constant"> .]                                                 ╎remainder a, b'                                  .</span>
-<span id="L740" class="LineNr">740 </span>   <span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L731" class="LineNr">731 </span>  <span class="Conceal">¦</span><span class="Constant"> .  errors found (0)                                                               run (F4)           .</span>
+<span id="L732" class="LineNr">732 </span>  <span class="Conceal">¦</span><span class="Constant"> .recipe foo [                                      ╎                                                 .</span>
+<span id="L733" class="LineNr">733 </span>  <span class="Conceal">¦</span><span class="Constant"> .  local-scope                                     ╎─────────────────────────────────────────────────.</span>
+<span id="L734" class="LineNr">734 </span>  <span class="Conceal">¦</span><span class="Constant"> .  a:num &lt;- next-ingredient                        ╎0   edit          copy            delete         .</span>
+<span id="L735" class="LineNr">735 </span>  <span class="Conceal">¦</span><span class="Constant"> .  b:num &lt;- next-ingredient                        ╎foo 4, 0                                         .</span>
+<span id="L736" class="LineNr">736 </span>  <span class="Conceal">¦</span><span class="Constant"> .  stash [dividing by], b                          ╎dividing by 0                                    .</span>
+<span id="L737" class="LineNr">737 </span>  <span class="Conceal">¦</span><span class="Constant"> .  _, c:num &lt;- divide-with-remainder a, b          ╎14 instructions run                              .</span>
+<span id="L738" class="LineNr">738 </span>  <span class="Conceal">¦</span><span class="Constant"> .  reply b                                         ╎foo: divide by zero in '_, c:num &lt;- divide-with-↩.</span>
+<span id="L739" class="LineNr">739 </span>  <span class="Conceal">¦</span><span class="Constant"> .]                                                 ╎remainder a, b'                                  .</span>
+<span id="L740" class="LineNr">740 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
 <span id="L741" class="LineNr">741 </span>  ]
 <span id="L742" class="LineNr">742 </span>]
 </pre>
diff --git a/html/edit/012-editor-undo.mu.html b/html/edit/012-editor-undo.mu.html
index 023ecc94..39255865 100644
--- a/html/edit/012-editor-undo.mu.html
+++ b/html/edit/012-editor-undo.mu.html
@@ -15,16 +15,17 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 .muScenario { color: #00af00; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -80,8 +81,8 @@ if ('onhashchange' in window) {
 <span id="L19" class="LineNr">  19 </span>  insert-from:&amp;:duplex-list:char
 <span id="L20" class="LineNr">  20 </span>  insert-until:&amp;:duplex-list:char
 <span id="L21" class="LineNr">  21 </span>  tag:num  <span class="Comment"># event causing this operation; might be used to coalesce runs of similar events</span>
-<span id="L22" class="LineNr">  22 </span>    <span class="Comment"># 0: no coalesce (enter+indent)</span>
-<span id="L23" class="LineNr">  23 </span>    <span class="Comment"># 1: regular alphanumeric characters</span>
+<span id="L22" class="LineNr">  22 </span>  <span class="Conceal">¦</span> <span class="Comment"># 0: no coalesce (enter+indent)</span>
+<span id="L23" class="LineNr">  23 </span>  <span class="Conceal">¦</span> <span class="Comment"># 1: regular alphanumeric characters</span>
 <span id="L24" class="LineNr">  24 </span>]
 <span id="L25" class="LineNr">  25 </span>
 <span id="L26" class="LineNr">  26 </span><span class="muData">container</span> <a href='012-editor-undo.mu.html#L26'>move-operation</a> [
@@ -92,11 +93,11 @@ if ('onhashchange' in window) {
 <span id="L31" class="LineNr">  31 </span>  after-column:num
 <span id="L32" class="LineNr">  32 </span>  after-top-of-screen:&amp;:duplex-list:char
 <span id="L33" class="LineNr">  33 </span>  tag:num  <span class="Comment"># event causing this operation; might be used to coalesce runs of similar events</span>
-<span id="L34" class="LineNr">  34 </span>    <span class="Comment"># 0: no coalesce (touch events, etc)</span>
-<span id="L35" class="LineNr">  35 </span>    <span class="Comment"># 1: left arrow</span>
-<span id="L36" class="LineNr">  36 </span>    <span class="Comment"># 2: right arrow</span>
-<span id="L37" class="LineNr">  37 </span>    <span class="Comment"># 3: up arrow</span>
-<span id="L38" class="LineNr">  38 </span>    <span class="Comment"># 4: down arrow</span>
+<span id="L34" class="LineNr">  34 </span>  <span class="Conceal">¦</span> <span class="Comment"># 0: no coalesce (touch events, etc)</span>
+<span id="L35" class="LineNr">  35 </span>  <span class="Conceal">¦</span> <span class="Comment"># 1: left arrow</span>
+<span id="L36" class="LineNr">  36 </span>  <span class="Conceal">¦</span> <span class="Comment"># 2: right arrow</span>
+<span id="L37" class="LineNr">  37 </span>  <span class="Conceal">¦</span> <span class="Comment"># 3: up arrow</span>
+<span id="L38" class="LineNr">  38 </span>  <span class="Conceal">¦</span> <span class="Comment"># 4: down arrow</span>
 <span id="L39" class="LineNr">  39 </span>]
 <span id="L40" class="LineNr">  40 </span>
 <span id="L41" class="LineNr">  41 </span><span class="muData">container</span> <a href='012-editor-undo.mu.html#L41'>delete-operation</a> [
@@ -110,9 +111,9 @@ if ('onhashchange' in window) {
 <span id="L49" class="LineNr">  49 </span>  delete-from:&amp;:duplex-list:char
 <span id="L50" class="LineNr">  50 </span>  delete-until:&amp;:duplex-list:char
 <span id="L51" class="LineNr">  51 </span>  tag:num  <span class="Comment"># event causing this operation; might be used to coalesce runs of similar events</span>
-<span id="L52" class="LineNr">  52 </span>    <span class="Comment"># 0: no coalesce (ctrl-k, ctrl-u)</span>
-<span id="L53" class="LineNr">  53 </span>    <span class="Comment"># 1: backspace</span>
-<span id="L54" class="LineNr">  54 </span>    <span class="Comment"># 2: delete</span>
+<span id="L52" class="LineNr">  52 </span>  <span class="Conceal">¦</span> <span class="Comment"># 0: no coalesce (ctrl-k, ctrl-u)</span>
+<span id="L53" class="LineNr">  53 </span>  <span class="Conceal">¦</span> <span class="Comment"># 1: backspace</span>
+<span id="L54" class="LineNr">  54 </span>  <span class="Conceal">¦</span> <span class="Comment"># 2: delete</span>
 <span id="L55" class="LineNr">  55 </span>]
 <span id="L56" class="LineNr">  56 </span>
 <span id="L57" class="LineNr">  57 </span><span class="Comment"># every editor accumulates a list of operations to undo/redo</span>
@@ -124,36 +125,36 @@ if ('onhashchange' in window) {
 <span id="L63" class="LineNr">  63 </span><span class="Comment"># ctrl-z - undo operation</span>
 <span id="L64" class="LineNr">  64 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L65" class="LineNr">  65 </span>  <span class="Delimiter">{</span>
-<span id="L66" class="LineNr">  66 </span>    undo?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">26/ctrl-z</span>
-<span id="L67" class="LineNr">  67 </span>    <span class="muControl">break-unless</span> undo?
-<span id="L68" class="LineNr">  68 </span>    undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
-<span id="L69" class="LineNr">  69 </span>    <span class="muControl">break-unless</span> undo
-<span id="L70" class="LineNr">  70 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
-<span id="L71" class="LineNr">  71 </span>    undo <span class="Special">&lt;-</span> <a href='../064list.mu.html#L25'>rest</a> undo
-<span id="L72" class="LineNr">  72 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">undo:offset</span>, undo
-<span id="L73" class="LineNr">  73 </span>    redo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">redo:offset</span>
-<span id="L74" class="LineNr">  74 </span>    redo <span class="Special">&lt;-</span> push op, redo
-<span id="L75" class="LineNr">  75 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">redo:offset</span>, redo
-<span id="L76" class="LineNr">  76 </span><span class="Constant">    <a href='012-editor-undo.mu.html#L76'>&lt;handle-undo&gt;</a></span>
-<span id="L77" class="LineNr">  77 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L66" class="LineNr">  66 </span>  <span class="Conceal">¦</span> undo?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">26/ctrl-z</span>
+<span id="L67" class="LineNr">  67 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo?
+<span id="L68" class="LineNr">  68 </span>  <span class="Conceal">¦</span> undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
+<span id="L69" class="LineNr">  69 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo
+<span id="L70" class="LineNr">  70 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
+<span id="L71" class="LineNr">  71 </span>  <span class="Conceal">¦</span> undo <span class="Special">&lt;-</span> <a href='../064list.mu.html#L25'>rest</a> undo
+<span id="L72" class="LineNr">  72 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">undo:offset</span>, undo
+<span id="L73" class="LineNr">  73 </span>  <span class="Conceal">¦</span> redo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">redo:offset</span>
+<span id="L74" class="LineNr">  74 </span>  <span class="Conceal">¦</span> redo <span class="Special">&lt;-</span> push op, redo
+<span id="L75" class="LineNr">  75 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">redo:offset</span>, redo
+<span id="L76" class="LineNr">  76 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='012-editor-undo.mu.html#L76'>&lt;handle-undo&gt;</a></span>
+<span id="L77" class="LineNr">  77 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L78" class="LineNr">  78 </span>  <span class="Delimiter">}</span>
 <span id="L79" class="LineNr">  79 </span>]
 <span id="L80" class="LineNr">  80 </span>
 <span id="L81" class="LineNr">  81 </span><span class="Comment"># ctrl-y - redo operation</span>
 <span id="L82" class="LineNr">  82 </span><span class="muRecipe">after</span> <span class="Constant"><a href='002-typing.mu.html#L183'>&lt;handle-special-character&gt;</a></span> [
 <span id="L83" class="LineNr">  83 </span>  <span class="Delimiter">{</span>
-<span id="L84" class="LineNr">  84 </span>    redo?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">25/ctrl-y</span>
-<span id="L85" class="LineNr">  85 </span>    <span class="muControl">break-unless</span> redo?
-<span id="L86" class="LineNr">  86 </span>    redo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">redo:offset</span>
-<span id="L87" class="LineNr">  87 </span>    <span class="muControl">break-unless</span> redo
-<span id="L88" class="LineNr">  88 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first redo
-<span id="L89" class="LineNr">  89 </span>    redo <span class="Special">&lt;-</span> <a href='../064list.mu.html#L25'>rest</a> redo
-<span id="L90" class="LineNr">  90 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">redo:offset</span>, redo
-<span id="L91" class="LineNr">  91 </span>    undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
-<span id="L92" class="LineNr">  92 </span>    undo <span class="Special">&lt;-</span> push op, undo
-<span id="L93" class="LineNr">  93 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">undo:offset</span>, undo
-<span id="L94" class="LineNr">  94 </span><span class="Constant">    <a href='012-editor-undo.mu.html#L94'>&lt;handle-redo&gt;</a></span>
-<span id="L95" class="LineNr">  95 </span>    <span class="muControl">return</span> <span class="Constant">1/go-render</span>
+<span id="L84" class="LineNr">  84 </span>  <span class="Conceal">¦</span> redo?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">25/ctrl-y</span>
+<span id="L85" class="LineNr">  85 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> redo?
+<span id="L86" class="LineNr">  86 </span>  <span class="Conceal">¦</span> redo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">redo:offset</span>
+<span id="L87" class="LineNr">  87 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> redo
+<span id="L88" class="LineNr">  88 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first redo
+<span id="L89" class="LineNr">  89 </span>  <span class="Conceal">¦</span> redo <span class="Special">&lt;-</span> <a href='../064list.mu.html#L25'>rest</a> redo
+<span id="L90" class="LineNr">  90 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">redo:offset</span>, redo
+<span id="L91" class="LineNr">  91 </span>  <span class="Conceal">¦</span> undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
+<span id="L92" class="LineNr">  92 </span>  <span class="Conceal">¦</span> undo <span class="Special">&lt;-</span> push op, undo
+<span id="L93" class="LineNr">  93 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">undo:offset</span>, undo
+<span id="L94" class="LineNr">  94 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='012-editor-undo.mu.html#L94'>&lt;handle-redo&gt;</a></span>
+<span id="L95" class="LineNr">  95 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/go-render</span>
 <span id="L96" class="LineNr">  96 </span>  <span class="Delimiter">}</span>
 <span id="L97" class="LineNr">  97 </span>]
 <span id="L98" class="LineNr">  98 </span>
@@ -166,35 +167,35 @@ if ('onhashchange' in window) {
 <span id="L105" class="LineNr"> 105 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L106" class="LineNr"> 106 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L107" class="LineNr"> 107 </span>  assume-console [
-<span id="L108" class="LineNr"> 108 </span>    type <span class="Constant">[0]</span>
+<span id="L108" class="LineNr"> 108 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L109" class="LineNr"> 109 </span>  ]
 <span id="L110" class="LineNr"> 110 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L111" class="LineNr"> 111 </span>  <span class="Comment"># undo</span>
 <span id="L112" class="LineNr"> 112 </span>  assume-console [
-<span id="L113" class="LineNr"> 113 </span>    press ctrl-z
+<span id="L113" class="LineNr"> 113 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L114" class="LineNr"> 114 </span>  ]
 <span id="L115" class="LineNr"> 115 </span>  run [
-<span id="L116" class="LineNr"> 116 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L116" class="LineNr"> 116 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L117" class="LineNr"> 117 </span>  ]
 <span id="L118" class="LineNr"> 118 </span>  <span class="Comment"># character should be gone</span>
 <span id="L119" class="LineNr"> 119 </span>  screen-should-contain [
-<span id="L120" class="LineNr"> 120 </span>   <span class="Constant"> .          .</span>
-<span id="L121" class="LineNr"> 121 </span>   <span class="Constant"> .          .</span>
-<span id="L122" class="LineNr"> 122 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L123" class="LineNr"> 123 </span>   <span class="Constant"> .          .</span>
+<span id="L120" class="LineNr"> 120 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L121" class="LineNr"> 121 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L122" class="LineNr"> 122 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L123" class="LineNr"> 123 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L124" class="LineNr"> 124 </span>  ]
 <span id="L125" class="LineNr"> 125 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L126" class="LineNr"> 126 </span>  assume-console [
-<span id="L127" class="LineNr"> 127 </span>    type <span class="Constant">[1]</span>
+<span id="L127" class="LineNr"> 127 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L128" class="LineNr"> 128 </span>  ]
 <span id="L129" class="LineNr"> 129 </span>  run [
-<span id="L130" class="LineNr"> 130 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L130" class="LineNr"> 130 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L131" class="LineNr"> 131 </span>  ]
 <span id="L132" class="LineNr"> 132 </span>  screen-should-contain [
-<span id="L133" class="LineNr"> 133 </span>   <span class="Constant"> .          .</span>
-<span id="L134" class="LineNr"> 134 </span>   <span class="Constant"> .1         .</span>
-<span id="L135" class="LineNr"> 135 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L136" class="LineNr"> 136 </span>   <span class="Constant"> .          .</span>
+<span id="L133" class="LineNr"> 133 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L134" class="LineNr"> 134 </span>  <span class="Conceal">¦</span><span class="Constant"> .1         .</span>
+<span id="L135" class="LineNr"> 135 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L136" class="LineNr"> 136 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L137" class="LineNr"> 137 </span>  ]
 <span id="L138" class="LineNr"> 138 </span>]
 <span id="L139" class="LineNr"> 139 </span>
@@ -209,21 +210,21 @@ if ('onhashchange' in window) {
 <span id="L148" class="LineNr"> 148 </span>  cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
 <span id="L149" class="LineNr"> 149 </span>  undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
 <span id="L150" class="LineNr"> 150 </span>  <span class="Delimiter">{</span>
-<span id="L151" class="LineNr"> 151 </span>    <span class="Comment"># if previous operation was an insert, coalesce this operation with it</span>
-<span id="L152" class="LineNr"> 152 </span>    <span class="muControl">break-unless</span> undo
-<span id="L153" class="LineNr"> 153 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
-<span id="L154" class="LineNr"> 154 </span>    typing:<a href='012-editor-undo.mu.html#L11'>insert-operation</a>, is-insert?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">typing:variant</span>
-<span id="L155" class="LineNr"> 155 </span>    <span class="muControl">break-unless</span> is-insert?
-<span id="L156" class="LineNr"> 156 </span>    previous-coalesce-tag:num <span class="Special">&lt;-</span> get typing, <span class="Constant">tag:offset</span>
-<span id="L157" class="LineNr"> 157 </span>    <span class="muControl">break-unless</span> previous-coalesce-tag
-<span id="L158" class="LineNr"> 158 </span>    before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
-<span id="L159" class="LineNr"> 159 </span>    insert-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L160" class="LineNr"> 160 </span>    typing <span class="Special">&lt;-</span> put typing, <span class="Constant">insert-until:offset</span>, insert-until
-<span id="L161" class="LineNr"> 161 </span>    typing <span class="Special">&lt;-</span> put typing, <span class="Constant">after-row:offset</span>, cursor-row
-<span id="L162" class="LineNr"> 162 </span>    typing <span class="Special">&lt;-</span> put typing, <span class="Constant">after-column:offset</span>, cursor-column
-<span id="L163" class="LineNr"> 163 </span>    typing <span class="Special">&lt;-</span> put typing, <span class="Constant">after-top-of-screen:offset</span>, top-after
-<span id="L164" class="LineNr"> 164 </span>    *op <span class="Special">&lt;-</span> merge <span class="Constant">0/insert-operation</span>, typing
-<span id="L165" class="LineNr"> 165 </span>    <span class="muControl">break</span> <span class="Constant">+done-adding-insert-operation</span>
+<span id="L151" class="LineNr"> 151 </span>  <span class="Conceal">¦</span> <span class="Comment"># if previous operation was an insert, coalesce this operation with it</span>
+<span id="L152" class="LineNr"> 152 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo
+<span id="L153" class="LineNr"> 153 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
+<span id="L154" class="LineNr"> 154 </span>  <span class="Conceal">¦</span> typing:<a href='012-editor-undo.mu.html#L11'>insert-operation</a>, is-insert?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">typing:variant</span>
+<span id="L155" class="LineNr"> 155 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-insert?
+<span id="L156" class="LineNr"> 156 </span>  <span class="Conceal">¦</span> previous-coalesce-tag:num <span class="Special">&lt;-</span> get typing, <span class="Constant">tag:offset</span>
+<span id="L157" class="LineNr"> 157 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> previous-coalesce-tag
+<span id="L158" class="LineNr"> 158 </span>  <span class="Conceal">¦</span> before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
+<span id="L159" class="LineNr"> 159 </span>  <span class="Conceal">¦</span> insert-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L160" class="LineNr"> 160 </span>  <span class="Conceal">¦</span> typing <span class="Special">&lt;-</span> put typing, <span class="Constant">insert-until:offset</span>, insert-until
+<span id="L161" class="LineNr"> 161 </span>  <span class="Conceal">¦</span> typing <span class="Special">&lt;-</span> put typing, <span class="Constant">after-row:offset</span>, cursor-row
+<span id="L162" class="LineNr"> 162 </span>  <span class="Conceal">¦</span> typing <span class="Special">&lt;-</span> put typing, <span class="Constant">after-column:offset</span>, cursor-column
+<span id="L163" class="LineNr"> 163 </span>  <span class="Conceal">¦</span> typing <span class="Special">&lt;-</span> put typing, <span class="Constant">after-top-of-screen:offset</span>, top-after
+<span id="L164" class="LineNr"> 164 </span>  <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">0/insert-operation</span>, typing
+<span id="L165" class="LineNr"> 165 </span>  <span class="Conceal">¦</span> <span class="muControl">break</span> <span class="Constant">+done-adding-insert-operation</span>
 <span id="L166" class="LineNr"> 166 </span>  <span class="Delimiter">}</span>
 <span id="L167" class="LineNr"> 167 </span>  <span class="Comment"># if not, create a new operation</span>
 <span id="L168" class="LineNr"> 168 </span>  insert-from:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> cursor-before
@@ -271,20 +272,20 @@ if ('onhashchange' in window) {
 <span id="L210" class="LineNr"> 210 </span>
 <span id="L211" class="LineNr"> 211 </span><span class="muRecipe">after</span> <span class="Constant"><a href='012-editor-undo.mu.html#L76'>&lt;handle-undo&gt;</a></span> [
 <span id="L212" class="LineNr"> 212 </span>  <span class="Delimiter">{</span>
-<span id="L213" class="LineNr"> 213 </span>    typing:<a href='012-editor-undo.mu.html#L11'>insert-operation</a>, is-insert?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">typing:variant</span>
-<span id="L214" class="LineNr"> 214 </span>    <span class="muControl">break-unless</span> is-insert?
-<span id="L215" class="LineNr"> 215 </span>    start:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-from:offset</span>
-<span id="L216" class="LineNr"> 216 </span>    end:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-until:offset</span>
-<span id="L217" class="LineNr"> 217 </span>    <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
-<span id="L218" class="LineNr"> 218 </span>    before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> start
-<span id="L219" class="LineNr"> 219 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
-<span id="L220" class="LineNr"> 220 </span>    <a href='../065duplex_list.mu.html#L345'>remove-between</a> before-cursor, end
-<span id="L221" class="LineNr"> 221 </span>    cursor-row <span class="Special">&lt;-</span> get typing, <span class="Constant">before-row:offset</span>
-<span id="L222" class="LineNr"> 222 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L223" class="LineNr"> 223 </span>    cursor-column <span class="Special">&lt;-</span> get typing, <span class="Constant">before-column:offset</span>
-<span id="L224" class="LineNr"> 224 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L225" class="LineNr"> 225 </span>    top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">before-top-of-screen:offset</span>
-<span id="L226" class="LineNr"> 226 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
+<span id="L213" class="LineNr"> 213 </span>  <span class="Conceal">¦</span> typing:<a href='012-editor-undo.mu.html#L11'>insert-operation</a>, is-insert?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">typing:variant</span>
+<span id="L214" class="LineNr"> 214 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-insert?
+<span id="L215" class="LineNr"> 215 </span>  <span class="Conceal">¦</span> start:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-from:offset</span>
+<span id="L216" class="LineNr"> 216 </span>  <span class="Conceal">¦</span> end:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-until:offset</span>
+<span id="L217" class="LineNr"> 217 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
+<span id="L218" class="LineNr"> 218 </span>  <span class="Conceal">¦</span> before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> start
+<span id="L219" class="LineNr"> 219 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
+<span id="L220" class="LineNr"> 220 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L345'>remove-between</a> before-cursor, end
+<span id="L221" class="LineNr"> 221 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get typing, <span class="Constant">before-row:offset</span>
+<span id="L222" class="LineNr"> 222 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L223" class="LineNr"> 223 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> get typing, <span class="Constant">before-column:offset</span>
+<span id="L224" class="LineNr"> 224 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L225" class="LineNr"> 225 </span>  <span class="Conceal">¦</span> top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">before-top-of-screen:offset</span>
+<span id="L226" class="LineNr"> 226 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
 <span id="L227" class="LineNr"> 227 </span>  <span class="Delimiter">}</span>
 <span id="L228" class="LineNr"> 228 </span>]
 <span id="L229" class="LineNr"> 229 </span>
@@ -295,22 +296,22 @@ if ('onhashchange' in window) {
 <span id="L234" class="LineNr"> 234 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L235" class="LineNr"> 235 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L236" class="LineNr"> 236 </span>  assume-console [
-<span id="L237" class="LineNr"> 237 </span>    type <span class="Constant">[012]</span>
+<span id="L237" class="LineNr"> 237 </span>  <span class="Conceal">¦</span> type <span class="Constant">[012]</span>
 <span id="L238" class="LineNr"> 238 </span>  ]
 <span id="L239" class="LineNr"> 239 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L240" class="LineNr"> 240 </span>  <span class="Comment"># undo</span>
 <span id="L241" class="LineNr"> 241 </span>  assume-console [
-<span id="L242" class="LineNr"> 242 </span>    press ctrl-z
+<span id="L242" class="LineNr"> 242 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L243" class="LineNr"> 243 </span>  ]
 <span id="L244" class="LineNr"> 244 </span>  run [
-<span id="L245" class="LineNr"> 245 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L245" class="LineNr"> 245 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L246" class="LineNr"> 246 </span>  ]
 <span id="L247" class="LineNr"> 247 </span>  <span class="Comment"># all characters must be gone</span>
 <span id="L248" class="LineNr"> 248 </span>  screen-should-contain [
-<span id="L249" class="LineNr"> 249 </span>   <span class="Constant"> .          .</span>
-<span id="L250" class="LineNr"> 250 </span>   <span class="Constant"> .          .</span>
-<span id="L251" class="LineNr"> 251 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L252" class="LineNr"> 252 </span>   <span class="Constant"> .          .</span>
+<span id="L249" class="LineNr"> 249 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L250" class="LineNr"> 250 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L251" class="LineNr"> 251 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L252" class="LineNr"> 252 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L253" class="LineNr"> 253 </span>  ]
 <span id="L254" class="LineNr"> 254 </span>]
 <span id="L255" class="LineNr"> 255 </span>
@@ -322,41 +323,41 @@ if ('onhashchange' in window) {
 <span id="L261" class="LineNr"> 261 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L262" class="LineNr"> 262 </span>  <span class="Comment"># type some characters</span>
 <span id="L263" class="LineNr"> 263 </span>  assume-console [
-<span id="L264" class="LineNr"> 264 </span>    type <span class="Constant">[012]</span>
+<span id="L264" class="LineNr"> 264 </span>  <span class="Conceal">¦</span> type <span class="Constant">[012]</span>
 <span id="L265" class="LineNr"> 265 </span>  ]
 <span id="L266" class="LineNr"> 266 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L267" class="LineNr"> 267 </span>  screen-should-contain [
-<span id="L268" class="LineNr"> 268 </span>   <span class="Constant"> .          .</span>
-<span id="L269" class="LineNr"> 269 </span>   <span class="Constant"> .012a      .</span>
-<span id="L270" class="LineNr"> 270 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L271" class="LineNr"> 271 </span>   <span class="Constant"> .          .</span>
+<span id="L268" class="LineNr"> 268 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L269" class="LineNr"> 269 </span>  <span class="Conceal">¦</span><span class="Constant"> .012a      .</span>
+<span id="L270" class="LineNr"> 270 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L271" class="LineNr"> 271 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L272" class="LineNr"> 272 </span>  ]
 <span id="L273" class="LineNr"> 273 </span>  <span class="Comment"># undo</span>
 <span id="L274" class="LineNr"> 274 </span>  assume-console [
-<span id="L275" class="LineNr"> 275 </span>    press ctrl-z
+<span id="L275" class="LineNr"> 275 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L276" class="LineNr"> 276 </span>  ]
 <span id="L277" class="LineNr"> 277 </span>  run [
-<span id="L278" class="LineNr"> 278 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L278" class="LineNr"> 278 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L279" class="LineNr"> 279 </span>  ]
 <span id="L280" class="LineNr"> 280 </span>  <span class="Comment"># back to original text</span>
 <span id="L281" class="LineNr"> 281 </span>  screen-should-contain [
-<span id="L282" class="LineNr"> 282 </span>   <span class="Constant"> .          .</span>
-<span id="L283" class="LineNr"> 283 </span>   <span class="Constant"> .a         .</span>
-<span id="L284" class="LineNr"> 284 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L285" class="LineNr"> 285 </span>   <span class="Constant"> .          .</span>
+<span id="L282" class="LineNr"> 282 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L283" class="LineNr"> 283 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L284" class="LineNr"> 284 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L285" class="LineNr"> 285 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L286" class="LineNr"> 286 </span>  ]
 <span id="L287" class="LineNr"> 287 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L288" class="LineNr"> 288 </span>  assume-console [
-<span id="L289" class="LineNr"> 289 </span>    type <span class="Constant">[3]</span>
+<span id="L289" class="LineNr"> 289 </span>  <span class="Conceal">¦</span> type <span class="Constant">[3]</span>
 <span id="L290" class="LineNr"> 290 </span>  ]
 <span id="L291" class="LineNr"> 291 </span>  run [
-<span id="L292" class="LineNr"> 292 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L292" class="LineNr"> 292 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L293" class="LineNr"> 293 </span>  ]
 <span id="L294" class="LineNr"> 294 </span>  screen-should-contain [
-<span id="L295" class="LineNr"> 295 </span>   <span class="Constant"> .          .</span>
-<span id="L296" class="LineNr"> 296 </span>   <span class="Constant"> .3a        .</span>
-<span id="L297" class="LineNr"> 297 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L298" class="LineNr"> 298 </span>   <span class="Constant"> .          .</span>
+<span id="L295" class="LineNr"> 295 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L296" class="LineNr"> 296 </span>  <span class="Conceal">¦</span><span class="Constant"> .3a        .</span>
+<span id="L297" class="LineNr"> 297 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L298" class="LineNr"> 298 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L299" class="LineNr"> 299 </span>  ]
 <span id="L300" class="LineNr"> 300 </span>]
 <span id="L301" class="LineNr"> 301 </span>
@@ -368,56 +369,56 @@ if ('onhashchange' in window) {
 <span id="L307" class="LineNr"> 307 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L308" class="LineNr"> 308 </span>  <span class="Comment"># new line</span>
 <span id="L309" class="LineNr"> 309 </span>  assume-console [
-<span id="L310" class="LineNr"> 310 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 8</span>
-<span id="L311" class="LineNr"> 311 </span>    press enter
+<span id="L310" class="LineNr"> 310 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 8</span>
+<span id="L311" class="LineNr"> 311 </span>  <span class="Conceal">¦</span> press enter
 <span id="L312" class="LineNr"> 312 </span>  ]
 <span id="L313" class="LineNr"> 313 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L314" class="LineNr"> 314 </span>  screen-should-contain [
-<span id="L315" class="LineNr"> 315 </span>   <span class="Constant"> .          .</span>
-<span id="L316" class="LineNr"> 316 </span>   <span class="Constant"> .  abc     .</span>
-<span id="L317" class="LineNr"> 317 </span>   <span class="Constant"> .          .</span>
-<span id="L318" class="LineNr"> 318 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L319" class="LineNr"> 319 </span>   <span class="Constant"> .          .</span>
+<span id="L315" class="LineNr"> 315 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L316" class="LineNr"> 316 </span>  <span class="Conceal">¦</span><span class="Constant"> .  abc     .</span>
+<span id="L317" class="LineNr"> 317 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L318" class="LineNr"> 318 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L319" class="LineNr"> 319 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L320" class="LineNr"> 320 </span>  ]
 <span id="L321" class="LineNr"> 321 </span>  <span class="Comment"># line is indented</span>
 <span id="L322" class="LineNr"> 322 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L323" class="LineNr"> 323 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L324" class="LineNr"> 324 </span>  memory-should-contain [
-<span id="L325" class="LineNr"> 325 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L326" class="LineNr"> 326 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L325" class="LineNr"> 325 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L326" class="LineNr"> 326 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L327" class="LineNr"> 327 </span>  ]
 <span id="L328" class="LineNr"> 328 </span>  <span class="Comment"># undo</span>
 <span id="L329" class="LineNr"> 329 </span>  assume-console [
-<span id="L330" class="LineNr"> 330 </span>    press ctrl-z
+<span id="L330" class="LineNr"> 330 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L331" class="LineNr"> 331 </span>  ]
 <span id="L332" class="LineNr"> 332 </span>  run [
-<span id="L333" class="LineNr"> 333 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L333" class="LineNr"> 333 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L334" class="LineNr"> 334 </span>  ]
 <span id="L335" class="LineNr"> 335 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L336" class="LineNr"> 336 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L337" class="LineNr"> 337 </span>  memory-should-contain [
-<span id="L338" class="LineNr"> 338 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L339" class="LineNr"> 339 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
+<span id="L338" class="LineNr"> 338 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L339" class="LineNr"> 339 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 5</span>
 <span id="L340" class="LineNr"> 340 </span>  ]
 <span id="L341" class="LineNr"> 341 </span>  <span class="Comment"># back to original text</span>
 <span id="L342" class="LineNr"> 342 </span>  screen-should-contain [
-<span id="L343" class="LineNr"> 343 </span>   <span class="Constant"> .          .</span>
-<span id="L344" class="LineNr"> 344 </span>   <span class="Constant"> .  abc     .</span>
-<span id="L345" class="LineNr"> 345 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L346" class="LineNr"> 346 </span>   <span class="Constant"> .          .</span>
+<span id="L343" class="LineNr"> 343 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L344" class="LineNr"> 344 </span>  <span class="Conceal">¦</span><span class="Constant"> .  abc     .</span>
+<span id="L345" class="LineNr"> 345 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L346" class="LineNr"> 346 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L347" class="LineNr"> 347 </span>  ]
 <span id="L348" class="LineNr"> 348 </span>  <span class="Comment"># cursor should be at end of line</span>
 <span id="L349" class="LineNr"> 349 </span>  assume-console [
-<span id="L350" class="LineNr"> 350 </span>    type <span class="Constant">[1]</span>
+<span id="L350" class="LineNr"> 350 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L351" class="LineNr"> 351 </span>  ]
 <span id="L352" class="LineNr"> 352 </span>  run [
-<span id="L353" class="LineNr"> 353 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L353" class="LineNr"> 353 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L354" class="LineNr"> 354 </span>  ]
 <span id="L355" class="LineNr"> 355 </span>  screen-should-contain [
-<span id="L356" class="LineNr"> 356 </span>   <span class="Constant"> .          .</span>
-<span id="L357" class="LineNr"> 357 </span>   <span class="Constant"> .  abc1    .</span>
-<span id="L358" class="LineNr"> 358 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L359" class="LineNr"> 359 </span>   <span class="Constant"> .          .</span>
+<span id="L356" class="LineNr"> 356 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L357" class="LineNr"> 357 </span>  <span class="Conceal">¦</span><span class="Constant"> .  abc1    .</span>
+<span id="L358" class="LineNr"> 358 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L359" class="LineNr"> 359 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L360" class="LineNr"> 360 </span>  ]
 <span id="L361" class="LineNr"> 361 </span>]
 <span id="L362" class="LineNr"> 362 </span>
@@ -430,60 +431,60 @@ if ('onhashchange' in window) {
 <span id="L369" class="LineNr"> 369 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[a]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L370" class="LineNr"> 370 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L371" class="LineNr"> 371 </span>  assume-console [
-<span id="L372" class="LineNr"> 372 </span>    type <span class="Constant">[012]</span>
-<span id="L373" class="LineNr"> 373 </span>    press ctrl-z
+<span id="L372" class="LineNr"> 372 </span>  <span class="Conceal">¦</span> type <span class="Constant">[012]</span>
+<span id="L373" class="LineNr"> 373 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L374" class="LineNr"> 374 </span>  ]
 <span id="L375" class="LineNr"> 375 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L376" class="LineNr"> 376 </span>  screen-should-contain [
-<span id="L377" class="LineNr"> 377 </span>   <span class="Constant"> .          .</span>
-<span id="L378" class="LineNr"> 378 </span>   <span class="Constant"> .a         .</span>
-<span id="L379" class="LineNr"> 379 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L380" class="LineNr"> 380 </span>   <span class="Constant"> .          .</span>
+<span id="L377" class="LineNr"> 377 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L378" class="LineNr"> 378 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L379" class="LineNr"> 379 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L380" class="LineNr"> 380 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L381" class="LineNr"> 381 </span>  ]
 <span id="L382" class="LineNr"> 382 </span>  <span class="Comment"># redo</span>
 <span id="L383" class="LineNr"> 383 </span>  assume-console [
-<span id="L384" class="LineNr"> 384 </span>    press ctrl-y
+<span id="L384" class="LineNr"> 384 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L385" class="LineNr"> 385 </span>  ]
 <span id="L386" class="LineNr"> 386 </span>  run [
-<span id="L387" class="LineNr"> 387 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L387" class="LineNr"> 387 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L388" class="LineNr"> 388 </span>  ]
 <span id="L389" class="LineNr"> 389 </span>  <span class="Comment"># all characters must be back</span>
 <span id="L390" class="LineNr"> 390 </span>  screen-should-contain [
-<span id="L391" class="LineNr"> 391 </span>   <span class="Constant"> .          .</span>
-<span id="L392" class="LineNr"> 392 </span>   <span class="Constant"> .012a      .</span>
-<span id="L393" class="LineNr"> 393 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L394" class="LineNr"> 394 </span>   <span class="Constant"> .          .</span>
+<span id="L391" class="LineNr"> 391 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L392" class="LineNr"> 392 </span>  <span class="Conceal">¦</span><span class="Constant"> .012a      .</span>
+<span id="L393" class="LineNr"> 393 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L394" class="LineNr"> 394 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L395" class="LineNr"> 395 </span>  ]
 <span id="L396" class="LineNr"> 396 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L397" class="LineNr"> 397 </span>  assume-console [
-<span id="L398" class="LineNr"> 398 </span>    type <span class="Constant">[3]</span>
+<span id="L398" class="LineNr"> 398 </span>  <span class="Conceal">¦</span> type <span class="Constant">[3]</span>
 <span id="L399" class="LineNr"> 399 </span>  ]
 <span id="L400" class="LineNr"> 400 </span>  run [
-<span id="L401" class="LineNr"> 401 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L401" class="LineNr"> 401 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L402" class="LineNr"> 402 </span>  ]
 <span id="L403" class="LineNr"> 403 </span>  screen-should-contain [
-<span id="L404" class="LineNr"> 404 </span>   <span class="Constant"> .          .</span>
-<span id="L405" class="LineNr"> 405 </span>   <span class="Constant"> .0123a     .</span>
-<span id="L406" class="LineNr"> 406 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L407" class="LineNr"> 407 </span>   <span class="Constant"> .          .</span>
+<span id="L404" class="LineNr"> 404 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L405" class="LineNr"> 405 </span>  <span class="Conceal">¦</span><span class="Constant"> .0123a     .</span>
+<span id="L406" class="LineNr"> 406 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L407" class="LineNr"> 407 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L408" class="LineNr"> 408 </span>  ]
 <span id="L409" class="LineNr"> 409 </span>]
 <span id="L410" class="LineNr"> 410 </span>
 <span id="L411" class="LineNr"> 411 </span><span class="muRecipe">after</span> <span class="Constant"><a href='012-editor-undo.mu.html#L94'>&lt;handle-redo&gt;</a></span> [
 <span id="L412" class="LineNr"> 412 </span>  <span class="Delimiter">{</span>
-<span id="L413" class="LineNr"> 413 </span>    typing:<a href='012-editor-undo.mu.html#L11'>insert-operation</a>, is-insert?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">typing:variant</span>
-<span id="L414" class="LineNr"> 414 </span>    <span class="muControl">break-unless</span> is-insert?
-<span id="L415" class="LineNr"> 415 </span>    before-cursor <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
-<span id="L416" class="LineNr"> 416 </span>    insert-from:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-from:offset</span>  <span class="Comment"># ignore insert-to because it's already been spliced away</span>
-<span id="L417" class="LineNr"> 417 </span>    <span class="Comment"># assert insert-to matches next(before-cursor)</span>
-<span id="L418" class="LineNr"> 418 </span>    <a href='../065duplex_list.mu.html#L485'>insert-range</a> before-cursor, insert-from
-<span id="L419" class="LineNr"> 419 </span>    <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
-<span id="L420" class="LineNr"> 420 </span>    cursor-row <span class="Special">&lt;-</span> get typing, <span class="Constant">after-row:offset</span>
-<span id="L421" class="LineNr"> 421 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L422" class="LineNr"> 422 </span>    cursor-column <span class="Special">&lt;-</span> get typing, <span class="Constant">after-column:offset</span>
-<span id="L423" class="LineNr"> 423 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L424" class="LineNr"> 424 </span>    top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">after-top-of-screen:offset</span>
-<span id="L425" class="LineNr"> 425 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
+<span id="L413" class="LineNr"> 413 </span>  <span class="Conceal">¦</span> typing:<a href='012-editor-undo.mu.html#L11'>insert-operation</a>, is-insert?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">typing:variant</span>
+<span id="L414" class="LineNr"> 414 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-insert?
+<span id="L415" class="LineNr"> 415 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
+<span id="L416" class="LineNr"> 416 </span>  <span class="Conceal">¦</span> insert-from:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">insert-from:offset</span>  <span class="Comment"># ignore insert-to because it's already been spliced away</span>
+<span id="L417" class="LineNr"> 417 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert insert-to matches next(before-cursor)</span>
+<span id="L418" class="LineNr"> 418 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L485'>insert-range</a> before-cursor, insert-from
+<span id="L419" class="LineNr"> 419 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
+<span id="L420" class="LineNr"> 420 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get typing, <span class="Constant">after-row:offset</span>
+<span id="L421" class="LineNr"> 421 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L422" class="LineNr"> 422 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> get typing, <span class="Constant">after-column:offset</span>
+<span id="L423" class="LineNr"> 423 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L424" class="LineNr"> 424 </span>  <span class="Conceal">¦</span> top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get typing, <span class="Constant">after-top-of-screen:offset</span>
+<span id="L425" class="LineNr"> 425 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
 <span id="L426" class="LineNr"> 426 </span>  <span class="Delimiter">}</span>
 <span id="L427" class="LineNr"> 427 </span>]
 <span id="L428" class="LineNr"> 428 </span>
@@ -494,42 +495,42 @@ if ('onhashchange' in window) {
 <span id="L433" class="LineNr"> 433 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L434" class="LineNr"> 434 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L435" class="LineNr"> 435 </span>  assume-console [
-<span id="L436" class="LineNr"> 436 </span>    type <span class="Constant">[012]</span>
-<span id="L437" class="LineNr"> 437 </span>    press ctrl-z
+<span id="L436" class="LineNr"> 436 </span>  <span class="Conceal">¦</span> type <span class="Constant">[012]</span>
+<span id="L437" class="LineNr"> 437 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L438" class="LineNr"> 438 </span>  ]
 <span id="L439" class="LineNr"> 439 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L440" class="LineNr"> 440 </span>  screen-should-contain [
-<span id="L441" class="LineNr"> 441 </span>   <span class="Constant"> .          .</span>
-<span id="L442" class="LineNr"> 442 </span>   <span class="Constant"> .          .</span>
-<span id="L443" class="LineNr"> 443 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L444" class="LineNr"> 444 </span>   <span class="Constant"> .          .</span>
+<span id="L441" class="LineNr"> 441 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L442" class="LineNr"> 442 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L443" class="LineNr"> 443 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L444" class="LineNr"> 444 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L445" class="LineNr"> 445 </span>  ]
 <span id="L446" class="LineNr"> 446 </span>  <span class="Comment"># redo</span>
 <span id="L447" class="LineNr"> 447 </span>  assume-console [
-<span id="L448" class="LineNr"> 448 </span>    press ctrl-y
+<span id="L448" class="LineNr"> 448 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L449" class="LineNr"> 449 </span>  ]
 <span id="L450" class="LineNr"> 450 </span>  run [
-<span id="L451" class="LineNr"> 451 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L451" class="LineNr"> 451 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L452" class="LineNr"> 452 </span>  ]
 <span id="L453" class="LineNr"> 453 </span>  <span class="Comment"># all characters must be back</span>
 <span id="L454" class="LineNr"> 454 </span>  screen-should-contain [
-<span id="L455" class="LineNr"> 455 </span>   <span class="Constant"> .          .</span>
-<span id="L456" class="LineNr"> 456 </span>   <span class="Constant"> .012       .</span>
-<span id="L457" class="LineNr"> 457 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L458" class="LineNr"> 458 </span>   <span class="Constant"> .          .</span>
+<span id="L455" class="LineNr"> 455 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L456" class="LineNr"> 456 </span>  <span class="Conceal">¦</span><span class="Constant"> .012       .</span>
+<span id="L457" class="LineNr"> 457 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L458" class="LineNr"> 458 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L459" class="LineNr"> 459 </span>  ]
 <span id="L460" class="LineNr"> 460 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L461" class="LineNr"> 461 </span>  assume-console [
-<span id="L462" class="LineNr"> 462 </span>    type <span class="Constant">[3]</span>
+<span id="L462" class="LineNr"> 462 </span>  <span class="Conceal">¦</span> type <span class="Constant">[3]</span>
 <span id="L463" class="LineNr"> 463 </span>  ]
 <span id="L464" class="LineNr"> 464 </span>  run [
-<span id="L465" class="LineNr"> 465 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L465" class="LineNr"> 465 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L466" class="LineNr"> 466 </span>  ]
 <span id="L467" class="LineNr"> 467 </span>  screen-should-contain [
-<span id="L468" class="LineNr"> 468 </span>   <span class="Constant"> .          .</span>
-<span id="L469" class="LineNr"> 469 </span>   <span class="Constant"> .0123      .</span>
-<span id="L470" class="LineNr"> 470 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L471" class="LineNr"> 471 </span>   <span class="Constant"> .          .</span>
+<span id="L468" class="LineNr"> 468 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L469" class="LineNr"> 469 </span>  <span class="Conceal">¦</span><span class="Constant"> .0123      .</span>
+<span id="L470" class="LineNr"> 470 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L471" class="LineNr"> 471 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L472" class="LineNr"> 472 </span>  ]
 <span id="L473" class="LineNr"> 473 </span>]
 <span id="L474" class="LineNr"> 474 </span>
@@ -543,36 +544,36 @@ if ('onhashchange' in window) {
 <span id="L482" class="LineNr"> 482 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> contents, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L483" class="LineNr"> 483 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L484" class="LineNr"> 484 </span>  assume-console [
-<span id="L485" class="LineNr"> 485 </span>    type <span class="Constant">[1]</span>
-<span id="L486" class="LineNr"> 486 </span>    press ctrl-z
+<span id="L485" class="LineNr"> 485 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
+<span id="L486" class="LineNr"> 486 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L487" class="LineNr"> 487 </span>  ]
 <span id="L488" class="LineNr"> 488 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L489" class="LineNr"> 489 </span>  <span class="Comment"># do some more work</span>
 <span id="L490" class="LineNr"> 490 </span>  assume-console [
-<span id="L491" class="LineNr"> 491 </span>    type <span class="Constant">[0]</span>
+<span id="L491" class="LineNr"> 491 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
 <span id="L492" class="LineNr"> 492 </span>  ]
 <span id="L493" class="LineNr"> 493 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L494" class="LineNr"> 494 </span>  screen-should-contain [
-<span id="L495" class="LineNr"> 495 </span>   <span class="Constant"> .          .</span>
-<span id="L496" class="LineNr"> 496 </span>   <span class="Constant"> .0abc      .</span>
-<span id="L497" class="LineNr"> 497 </span>   <span class="Constant"> .def       .</span>
-<span id="L498" class="LineNr"> 498 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L499" class="LineNr"> 499 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L495" class="LineNr"> 495 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L496" class="LineNr"> 496 </span>  <span class="Conceal">¦</span><span class="Constant"> .0abc      .</span>
+<span id="L497" class="LineNr"> 497 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L498" class="LineNr"> 498 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L499" class="LineNr"> 499 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L500" class="LineNr"> 500 </span>  ]
 <span id="L501" class="LineNr"> 501 </span>  <span class="Comment"># redo</span>
 <span id="L502" class="LineNr"> 502 </span>  assume-console [
-<span id="L503" class="LineNr"> 503 </span>    press ctrl-y
+<span id="L503" class="LineNr"> 503 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L504" class="LineNr"> 504 </span>  ]
 <span id="L505" class="LineNr"> 505 </span>  run [
-<span id="L506" class="LineNr"> 506 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L506" class="LineNr"> 506 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L507" class="LineNr"> 507 </span>  ]
 <span id="L508" class="LineNr"> 508 </span>  <span class="Comment"># nothing should happen</span>
 <span id="L509" class="LineNr"> 509 </span>  screen-should-contain [
-<span id="L510" class="LineNr"> 510 </span>   <span class="Constant"> .          .</span>
-<span id="L511" class="LineNr"> 511 </span>   <span class="Constant"> .0abc      .</span>
-<span id="L512" class="LineNr"> 512 </span>   <span class="Constant"> .def       .</span>
-<span id="L513" class="LineNr"> 513 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L514" class="LineNr"> 514 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L510" class="LineNr"> 510 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L511" class="LineNr"> 511 </span>  <span class="Conceal">¦</span><span class="Constant"> .0abc      .</span>
+<span id="L512" class="LineNr"> 512 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L513" class="LineNr"> 513 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L514" class="LineNr"> 514 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L515" class="LineNr"> 515 </span>  ]
 <span id="L516" class="LineNr"> 516 </span>]
 <span id="L517" class="LineNr"> 517 </span>
@@ -584,150 +585,150 @@ if ('onhashchange' in window) {
 <span id="L523" class="LineNr"> 523 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L524" class="LineNr"> 524 </span>  <span class="Comment"># insert some text and tabs, hit enter, some more text and tabs</span>
 <span id="L525" class="LineNr"> 525 </span>  assume-console [
-<span id="L526" class="LineNr"> 526 </span>    press tab
-<span id="L527" class="LineNr"> 527 </span>    type <span class="Constant">[ab]</span>
-<span id="L528" class="LineNr"> 528 </span>    press tab
-<span id="L529" class="LineNr"> 529 </span>    type <span class="Constant">[cd]</span>
-<span id="L530" class="LineNr"> 530 </span>    press enter
-<span id="L531" class="LineNr"> 531 </span>    press tab
-<span id="L532" class="LineNr"> 532 </span>    type <span class="Constant">[efg]</span>
+<span id="L526" class="LineNr"> 526 </span>  <span class="Conceal">¦</span> press tab
+<span id="L527" class="LineNr"> 527 </span>  <span class="Conceal">¦</span> type <span class="Constant">[ab]</span>
+<span id="L528" class="LineNr"> 528 </span>  <span class="Conceal">¦</span> press tab
+<span id="L529" class="LineNr"> 529 </span>  <span class="Conceal">¦</span> type <span class="Constant">[cd]</span>
+<span id="L530" class="LineNr"> 530 </span>  <span class="Conceal">¦</span> press enter
+<span id="L531" class="LineNr"> 531 </span>  <span class="Conceal">¦</span> press tab
+<span id="L532" class="LineNr"> 532 </span>  <span class="Conceal">¦</span> type <span class="Constant">[efg]</span>
 <span id="L533" class="LineNr"> 533 </span>  ]
 <span id="L534" class="LineNr"> 534 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L535" class="LineNr"> 535 </span>  screen-should-contain [
-<span id="L536" class="LineNr"> 536 </span>   <span class="Constant"> .          .</span>
-<span id="L537" class="LineNr"> 537 </span>   <span class="Constant"> .  ab  cd  .</span>
-<span id="L538" class="LineNr"> 538 </span>   <span class="Constant"> .    efg   .</span>
-<span id="L539" class="LineNr"> 539 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L540" class="LineNr"> 540 </span>   <span class="Constant"> .          .</span>
+<span id="L536" class="LineNr"> 536 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L537" class="LineNr"> 537 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab  cd  .</span>
+<span id="L538" class="LineNr"> 538 </span>  <span class="Conceal">¦</span><span class="Constant"> .    efg   .</span>
+<span id="L539" class="LineNr"> 539 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L540" class="LineNr"> 540 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L541" class="LineNr"> 541 </span>  ]
 <span id="L542" class="LineNr"> 542 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L543" class="LineNr"> 543 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L544" class="LineNr"> 544 </span>  memory-should-contain [
-<span id="L545" class="LineNr"> 545 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L546" class="LineNr"> 546 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L545" class="LineNr"> 545 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L546" class="LineNr"> 546 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
 <span id="L547" class="LineNr"> 547 </span>  ]
 <span id="L548" class="LineNr"> 548 </span>  <span class="Comment"># undo</span>
 <span id="L549" class="LineNr"> 549 </span>  assume-console [
-<span id="L550" class="LineNr"> 550 </span>    press ctrl-z
+<span id="L550" class="LineNr"> 550 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L551" class="LineNr"> 551 </span>  ]
 <span id="L552" class="LineNr"> 552 </span>  run [
-<span id="L553" class="LineNr"> 553 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L553" class="LineNr"> 553 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L554" class="LineNr"> 554 </span>  ]
 <span id="L555" class="LineNr"> 555 </span>  <span class="Comment"># typing in second line deleted, but not indent</span>
 <span id="L556" class="LineNr"> 556 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L557" class="LineNr"> 557 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L558" class="LineNr"> 558 </span>  memory-should-contain [
-<span id="L559" class="LineNr"> 559 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L560" class="LineNr"> 560 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L559" class="LineNr"> 559 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L560" class="LineNr"> 560 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L561" class="LineNr"> 561 </span>  ]
 <span id="L562" class="LineNr"> 562 </span>  screen-should-contain [
-<span id="L563" class="LineNr"> 563 </span>   <span class="Constant"> .          .</span>
-<span id="L564" class="LineNr"> 564 </span>   <span class="Constant"> .  ab  cd  .</span>
-<span id="L565" class="LineNr"> 565 </span>   <span class="Constant"> .          .</span>
-<span id="L566" class="LineNr"> 566 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L567" class="LineNr"> 567 </span>   <span class="Constant"> .          .</span>
+<span id="L563" class="LineNr"> 563 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L564" class="LineNr"> 564 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab  cd  .</span>
+<span id="L565" class="LineNr"> 565 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L566" class="LineNr"> 566 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L567" class="LineNr"> 567 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L568" class="LineNr"> 568 </span>  ]
 <span id="L569" class="LineNr"> 569 </span>  <span class="Comment"># undo again</span>
 <span id="L570" class="LineNr"> 570 </span>  assume-console [
-<span id="L571" class="LineNr"> 571 </span>    press ctrl-z
+<span id="L571" class="LineNr"> 571 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L572" class="LineNr"> 572 </span>  ]
 <span id="L573" class="LineNr"> 573 </span>  run [
-<span id="L574" class="LineNr"> 574 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L574" class="LineNr"> 574 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L575" class="LineNr"> 575 </span>  ]
 <span id="L576" class="LineNr"> 576 </span>  <span class="Comment"># indent and newline deleted</span>
 <span id="L577" class="LineNr"> 577 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L578" class="LineNr"> 578 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L579" class="LineNr"> 579 </span>  memory-should-contain [
-<span id="L580" class="LineNr"> 580 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L581" class="LineNr"> 581 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 8</span>
+<span id="L580" class="LineNr"> 580 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L581" class="LineNr"> 581 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 8</span>
 <span id="L582" class="LineNr"> 582 </span>  ]
 <span id="L583" class="LineNr"> 583 </span>  screen-should-contain [
-<span id="L584" class="LineNr"> 584 </span>   <span class="Constant"> .          .</span>
-<span id="L585" class="LineNr"> 585 </span>   <span class="Constant"> .  ab  cd  .</span>
-<span id="L586" class="LineNr"> 586 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L587" class="LineNr"> 587 </span>   <span class="Constant"> .          .</span>
+<span id="L584" class="LineNr"> 584 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L585" class="LineNr"> 585 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab  cd  .</span>
+<span id="L586" class="LineNr"> 586 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L587" class="LineNr"> 587 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L588" class="LineNr"> 588 </span>  ]
 <span id="L589" class="LineNr"> 589 </span>  <span class="Comment"># undo again</span>
 <span id="L590" class="LineNr"> 590 </span>  assume-console [
-<span id="L591" class="LineNr"> 591 </span>    press ctrl-z
+<span id="L591" class="LineNr"> 591 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L592" class="LineNr"> 592 </span>  ]
 <span id="L593" class="LineNr"> 593 </span>  run [
-<span id="L594" class="LineNr"> 594 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L594" class="LineNr"> 594 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L595" class="LineNr"> 595 </span>  ]
 <span id="L596" class="LineNr"> 596 </span>  <span class="Comment"># empty screen</span>
 <span id="L597" class="LineNr"> 597 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L598" class="LineNr"> 598 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L599" class="LineNr"> 599 </span>  memory-should-contain [
-<span id="L600" class="LineNr"> 600 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L601" class="LineNr"> 601 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L600" class="LineNr"> 600 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L601" class="LineNr"> 601 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L602" class="LineNr"> 602 </span>  ]
 <span id="L603" class="LineNr"> 603 </span>  screen-should-contain [
-<span id="L604" class="LineNr"> 604 </span>   <span class="Constant"> .          .</span>
-<span id="L605" class="LineNr"> 605 </span>   <span class="Constant"> .          .</span>
-<span id="L606" class="LineNr"> 606 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L607" class="LineNr"> 607 </span>   <span class="Constant"> .          .</span>
+<span id="L604" class="LineNr"> 604 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L605" class="LineNr"> 605 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L606" class="LineNr"> 606 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L607" class="LineNr"> 607 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L608" class="LineNr"> 608 </span>  ]
 <span id="L609" class="LineNr"> 609 </span>  <span class="Comment"># redo</span>
 <span id="L610" class="LineNr"> 610 </span>  assume-console [
-<span id="L611" class="LineNr"> 611 </span>    press ctrl-y
+<span id="L611" class="LineNr"> 611 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L612" class="LineNr"> 612 </span>  ]
 <span id="L613" class="LineNr"> 613 </span>  run [
-<span id="L614" class="LineNr"> 614 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L614" class="LineNr"> 614 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L615" class="LineNr"> 615 </span>  ]
 <span id="L616" class="LineNr"> 616 </span>  <span class="Comment"># first line inserted</span>
 <span id="L617" class="LineNr"> 617 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L618" class="LineNr"> 618 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L619" class="LineNr"> 619 </span>  memory-should-contain [
-<span id="L620" class="LineNr"> 620 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L621" class="LineNr"> 621 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 8</span>
+<span id="L620" class="LineNr"> 620 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L621" class="LineNr"> 621 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 8</span>
 <span id="L622" class="LineNr"> 622 </span>  ]
 <span id="L623" class="LineNr"> 623 </span>  screen-should-contain [
-<span id="L624" class="LineNr"> 624 </span>   <span class="Constant"> .          .</span>
-<span id="L625" class="LineNr"> 625 </span>   <span class="Constant"> .  ab  cd  .</span>
-<span id="L626" class="LineNr"> 626 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L627" class="LineNr"> 627 </span>   <span class="Constant"> .          .</span>
+<span id="L624" class="LineNr"> 624 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L625" class="LineNr"> 625 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab  cd  .</span>
+<span id="L626" class="LineNr"> 626 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L627" class="LineNr"> 627 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L628" class="LineNr"> 628 </span>  ]
 <span id="L629" class="LineNr"> 629 </span>  <span class="Comment"># redo again</span>
 <span id="L630" class="LineNr"> 630 </span>  assume-console [
-<span id="L631" class="LineNr"> 631 </span>    press ctrl-y
+<span id="L631" class="LineNr"> 631 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L632" class="LineNr"> 632 </span>  ]
 <span id="L633" class="LineNr"> 633 </span>  run [
-<span id="L634" class="LineNr"> 634 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L634" class="LineNr"> 634 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L635" class="LineNr"> 635 </span>  ]
 <span id="L636" class="LineNr"> 636 </span>  <span class="Comment"># newline and indent inserted</span>
 <span id="L637" class="LineNr"> 637 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L638" class="LineNr"> 638 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L639" class="LineNr"> 639 </span>  memory-should-contain [
-<span id="L640" class="LineNr"> 640 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L641" class="LineNr"> 641 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L640" class="LineNr"> 640 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L641" class="LineNr"> 641 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L642" class="LineNr"> 642 </span>  ]
 <span id="L643" class="LineNr"> 643 </span>  screen-should-contain [
-<span id="L644" class="LineNr"> 644 </span>   <span class="Constant"> .          .</span>
-<span id="L645" class="LineNr"> 645 </span>   <span class="Constant"> .  ab  cd  .</span>
-<span id="L646" class="LineNr"> 646 </span>   <span class="Constant"> .          .</span>
-<span id="L647" class="LineNr"> 647 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L648" class="LineNr"> 648 </span>   <span class="Constant"> .          .</span>
+<span id="L644" class="LineNr"> 644 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L645" class="LineNr"> 645 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab  cd  .</span>
+<span id="L646" class="LineNr"> 646 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L647" class="LineNr"> 647 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L648" class="LineNr"> 648 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L649" class="LineNr"> 649 </span>  ]
 <span id="L650" class="LineNr"> 650 </span>  <span class="Comment"># redo again</span>
 <span id="L651" class="LineNr"> 651 </span>  assume-console [
-<span id="L652" class="LineNr"> 652 </span>    press ctrl-y
+<span id="L652" class="LineNr"> 652 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L653" class="LineNr"> 653 </span>  ]
 <span id="L654" class="LineNr"> 654 </span>  run [
-<span id="L655" class="LineNr"> 655 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L655" class="LineNr"> 655 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L656" class="LineNr"> 656 </span>  ]
 <span id="L657" class="LineNr"> 657 </span>  <span class="Comment"># indent and newline deleted</span>
 <span id="L658" class="LineNr"> 658 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L659" class="LineNr"> 659 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L660" class="LineNr"> 660 </span>  memory-should-contain [
-<span id="L661" class="LineNr"> 661 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L662" class="LineNr"> 662 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
+<span id="L661" class="LineNr"> 661 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L662" class="LineNr"> 662 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 7</span>
 <span id="L663" class="LineNr"> 663 </span>  ]
 <span id="L664" class="LineNr"> 664 </span>  screen-should-contain [
-<span id="L665" class="LineNr"> 665 </span>   <span class="Constant"> .          .</span>
-<span id="L666" class="LineNr"> 666 </span>   <span class="Constant"> .  ab  cd  .</span>
-<span id="L667" class="LineNr"> 667 </span>   <span class="Constant"> .    efg   .</span>
-<span id="L668" class="LineNr"> 668 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L669" class="LineNr"> 669 </span>   <span class="Constant"> .          .</span>
+<span id="L665" class="LineNr"> 665 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L666" class="LineNr"> 666 </span>  <span class="Conceal">¦</span><span class="Constant"> .  ab  cd  .</span>
+<span id="L667" class="LineNr"> 667 </span>  <span class="Conceal">¦</span><span class="Constant"> .    efg   .</span>
+<span id="L668" class="LineNr"> 668 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L669" class="LineNr"> 669 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L670" class="LineNr"> 670 </span>  ]
 <span id="L671" class="LineNr"> 671 </span>]
 <span id="L672" class="LineNr"> 672 </span>
@@ -744,36 +745,36 @@ if ('onhashchange' in window) {
 <span id="L683" class="LineNr"> 683 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L684" class="LineNr"> 684 </span>  <span class="Comment"># move the cursor</span>
 <span id="L685" class="LineNr"> 685 </span>  assume-console [
-<span id="L686" class="LineNr"> 686 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
+<span id="L686" class="LineNr"> 686 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
 <span id="L687" class="LineNr"> 687 </span>  ]
 <span id="L688" class="LineNr"> 688 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L689" class="LineNr"> 689 </span>  <span class="Comment"># undo</span>
 <span id="L690" class="LineNr"> 690 </span>  assume-console [
-<span id="L691" class="LineNr"> 691 </span>    press ctrl-z
+<span id="L691" class="LineNr"> 691 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L692" class="LineNr"> 692 </span>  ]
 <span id="L693" class="LineNr"> 693 </span>  run [
-<span id="L694" class="LineNr"> 694 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L694" class="LineNr"> 694 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L695" class="LineNr"> 695 </span>  ]
 <span id="L696" class="LineNr"> 696 </span>  <span class="Comment"># click undone</span>
 <span id="L697" class="LineNr"> 697 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L698" class="LineNr"> 698 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L699" class="LineNr"> 699 </span>  memory-should-contain [
-<span id="L700" class="LineNr"> 700 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L701" class="LineNr"> 701 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L700" class="LineNr"> 700 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L701" class="LineNr"> 701 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L702" class="LineNr"> 702 </span>  ]
 <span id="L703" class="LineNr"> 703 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L704" class="LineNr"> 704 </span>  assume-console [
-<span id="L705" class="LineNr"> 705 </span>    type <span class="Constant">[1]</span>
+<span id="L705" class="LineNr"> 705 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L706" class="LineNr"> 706 </span>  ]
 <span id="L707" class="LineNr"> 707 </span>  run [
-<span id="L708" class="LineNr"> 708 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L708" class="LineNr"> 708 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L709" class="LineNr"> 709 </span>  ]
 <span id="L710" class="LineNr"> 710 </span>  screen-should-contain [
-<span id="L711" class="LineNr"> 711 </span>   <span class="Constant"> .          .</span>
-<span id="L712" class="LineNr"> 712 </span>   <span class="Constant"> .1abc      .</span>
-<span id="L713" class="LineNr"> 713 </span>   <span class="Constant"> .def       .</span>
-<span id="L714" class="LineNr"> 714 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L715" class="LineNr"> 715 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L711" class="LineNr"> 711 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L712" class="LineNr"> 712 </span>  <span class="Conceal">¦</span><span class="Constant"> .1abc      .</span>
+<span id="L713" class="LineNr"> 713 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L714" class="LineNr"> 714 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L715" class="LineNr"> 715 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L716" class="LineNr"> 716 </span>  ]
 <span id="L717" class="LineNr"> 717 </span>]
 <span id="L718" class="LineNr"> 718 </span>
@@ -787,22 +788,22 @@ if ('onhashchange' in window) {
 <span id="L726" class="LineNr"> 726 </span>  cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
 <span id="L727" class="LineNr"> 727 </span>  cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
 <span id="L728" class="LineNr"> 728 </span>  <span class="Delimiter">{</span>
-<span id="L729" class="LineNr"> 729 </span>    <span class="muControl">break-unless</span> undo-coalesce-tag
-<span id="L730" class="LineNr"> 730 </span>    <span class="Comment"># if previous operation was also a move, and also had the same coalesce</span>
-<span id="L731" class="LineNr"> 731 </span>    <span class="Comment"># tag, coalesce with it</span>
-<span id="L732" class="LineNr"> 732 </span>    undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
-<span id="L733" class="LineNr"> 733 </span>    <span class="muControl">break-unless</span> undo
-<span id="L734" class="LineNr"> 734 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
-<span id="L735" class="LineNr"> 735 </span>    move:<a href='012-editor-undo.mu.html#L26'>move-operation</a>, is-move?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">move:variant</span>
-<span id="L736" class="LineNr"> 736 </span>    <span class="muControl">break-unless</span> is-move?
-<span id="L737" class="LineNr"> 737 </span>    previous-coalesce-tag:num <span class="Special">&lt;-</span> get move, <span class="Constant">tag:offset</span>
-<span id="L738" class="LineNr"> 738 </span>    coalesce?:bool <span class="Special">&lt;-</span> equal undo-coalesce-tag, previous-coalesce-tag
-<span id="L739" class="LineNr"> 739 </span>    <span class="muControl">break-unless</span> coalesce?
-<span id="L740" class="LineNr"> 740 </span>    move <span class="Special">&lt;-</span> put move, <span class="Constant">after-row:offset</span>, cursor-row
-<span id="L741" class="LineNr"> 741 </span>    move <span class="Special">&lt;-</span> put move, <span class="Constant">after-column:offset</span>, cursor-column
-<span id="L742" class="LineNr"> 742 </span>    move <span class="Special">&lt;-</span> put move, <span class="Constant">after-top-of-screen:offset</span>, top-after
-<span id="L743" class="LineNr"> 743 </span>    *op <span class="Special">&lt;-</span> merge <span class="Constant">1/move-operation</span>, move
-<span id="L744" class="LineNr"> 744 </span>    <span class="muControl">break</span> <span class="Constant">+done-adding-move-operation</span>
+<span id="L729" class="LineNr"> 729 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo-coalesce-tag
+<span id="L730" class="LineNr"> 730 </span>  <span class="Conceal">¦</span> <span class="Comment"># if previous operation was also a move, and also had the same coalesce</span>
+<span id="L731" class="LineNr"> 731 </span>  <span class="Conceal">¦</span> <span class="Comment"># tag, coalesce with it</span>
+<span id="L732" class="LineNr"> 732 </span>  <span class="Conceal">¦</span> undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
+<span id="L733" class="LineNr"> 733 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo
+<span id="L734" class="LineNr"> 734 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
+<span id="L735" class="LineNr"> 735 </span>  <span class="Conceal">¦</span> move:<a href='012-editor-undo.mu.html#L26'>move-operation</a>, is-move?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">move:variant</span>
+<span id="L736" class="LineNr"> 736 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-move?
+<span id="L737" class="LineNr"> 737 </span>  <span class="Conceal">¦</span> previous-coalesce-tag:num <span class="Special">&lt;-</span> get move, <span class="Constant">tag:offset</span>
+<span id="L738" class="LineNr"> 738 </span>  <span class="Conceal">¦</span> coalesce?:bool <span class="Special">&lt;-</span> equal undo-coalesce-tag, previous-coalesce-tag
+<span id="L739" class="LineNr"> 739 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> coalesce?
+<span id="L740" class="LineNr"> 740 </span>  <span class="Conceal">¦</span> move <span class="Special">&lt;-</span> put move, <span class="Constant">after-row:offset</span>, cursor-row
+<span id="L741" class="LineNr"> 741 </span>  <span class="Conceal">¦</span> move <span class="Special">&lt;-</span> put move, <span class="Constant">after-column:offset</span>, cursor-column
+<span id="L742" class="LineNr"> 742 </span>  <span class="Conceal">¦</span> move <span class="Special">&lt;-</span> put move, <span class="Constant">after-top-of-screen:offset</span>, top-after
+<span id="L743" class="LineNr"> 743 </span>  <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">1/move-operation</span>, move
+<span id="L744" class="LineNr"> 744 </span>  <span class="Conceal">¦</span> <span class="muControl">break</span> <span class="Constant">+done-adding-move-operation</span>
 <span id="L745" class="LineNr"> 745 </span>  <span class="Delimiter">}</span>
 <span id="L746" class="LineNr"> 746 </span>  op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
 <span id="L747" class="LineNr"> 747 </span>  *op <span class="Special">&lt;-</span> merge <span class="Constant">1/move-operation</span>, cursor-row-before, cursor-column-before, top-before, cursor-row/after, cursor-column/after, top-after, undo-coalesce-tag
@@ -812,15 +813,15 @@ if ('onhashchange' in window) {
 <span id="L751" class="LineNr"> 751 </span>
 <span id="L752" class="LineNr"> 752 </span><span class="muRecipe">after</span> <span class="Constant"><a href='012-editor-undo.mu.html#L76'>&lt;handle-undo&gt;</a></span> [
 <span id="L753" class="LineNr"> 753 </span>  <span class="Delimiter">{</span>
-<span id="L754" class="LineNr"> 754 </span>    move:<a href='012-editor-undo.mu.html#L26'>move-operation</a>, is-move?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">move:variant</span>
-<span id="L755" class="LineNr"> 755 </span>    <span class="muControl">break-unless</span> is-move?
-<span id="L756" class="LineNr"> 756 </span>    <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
-<span id="L757" class="LineNr"> 757 </span>    cursor-row <span class="Special">&lt;-</span> get move, <span class="Constant">before-row:offset</span>
-<span id="L758" class="LineNr"> 758 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L759" class="LineNr"> 759 </span>    cursor-column <span class="Special">&lt;-</span> get move, <span class="Constant">before-column:offset</span>
-<span id="L760" class="LineNr"> 760 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L761" class="LineNr"> 761 </span>    top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get move, <span class="Constant">before-top-of-screen:offset</span>
-<span id="L762" class="LineNr"> 762 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
+<span id="L754" class="LineNr"> 754 </span>  <span class="Conceal">¦</span> move:<a href='012-editor-undo.mu.html#L26'>move-operation</a>, is-move?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">move:variant</span>
+<span id="L755" class="LineNr"> 755 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-move?
+<span id="L756" class="LineNr"> 756 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
+<span id="L757" class="LineNr"> 757 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get move, <span class="Constant">before-row:offset</span>
+<span id="L758" class="LineNr"> 758 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L759" class="LineNr"> 759 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> get move, <span class="Constant">before-column:offset</span>
+<span id="L760" class="LineNr"> 760 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L761" class="LineNr"> 761 </span>  <span class="Conceal">¦</span> top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get move, <span class="Constant">before-top-of-screen:offset</span>
+<span id="L762" class="LineNr"> 762 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
 <span id="L763" class="LineNr"> 763 </span>  <span class="Delimiter">}</span>
 <span id="L764" class="LineNr"> 764 </span>]
 <span id="L765" class="LineNr"> 765 </span>
@@ -835,56 +836,56 @@ if ('onhashchange' in window) {
 <span id="L774" class="LineNr"> 774 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> contents, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
 <span id="L775" class="LineNr"> 775 </span>  <span class="Comment"># position cursor at end of screen and try to move right</span>
 <span id="L776" class="LineNr"> 776 </span>  assume-console [
-<span id="L777" class="LineNr"> 777 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
-<span id="L778" class="LineNr"> 778 </span>    press right-arrow
+<span id="L777" class="LineNr"> 777 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 3</span>
+<span id="L778" class="LineNr"> 778 </span>  <span class="Conceal">¦</span> press right-arrow
 <span id="L779" class="LineNr"> 779 </span>  ]
 <span id="L780" class="LineNr"> 780 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L781" class="LineNr"> 781 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L782" class="LineNr"> 782 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L783" class="LineNr"> 783 </span>  <span class="Comment"># screen scrolls</span>
 <span id="L784" class="LineNr"> 784 </span>  screen-should-contain [
-<span id="L785" class="LineNr"> 785 </span>   <span class="Constant"> .     .</span>
-<span id="L786" class="LineNr"> 786 </span>   <span class="Constant"> .b    .</span>
-<span id="L787" class="LineNr"> 787 </span><span class="Constant">    .cdef↩.</span>
-<span id="L788" class="LineNr"> 788 </span>   <span class="Constant"> .gh   .</span>
+<span id="L785" class="LineNr"> 785 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L786" class="LineNr"> 786 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L787" class="LineNr"> 787 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .cdef↩.</span>
+<span id="L788" class="LineNr"> 788 </span>  <span class="Conceal">¦</span><span class="Constant"> .gh   .</span>
 <span id="L789" class="LineNr"> 789 </span>  ]
 <span id="L790" class="LineNr"> 790 </span>  memory-should-contain [
-<span id="L791" class="LineNr"> 791 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L792" class="LineNr"> 792 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L791" class="LineNr"> 791 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L792" class="LineNr"> 792 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L793" class="LineNr"> 793 </span>  ]
 <span id="L794" class="LineNr"> 794 </span>  <span class="Comment"># undo</span>
 <span id="L795" class="LineNr"> 795 </span>  assume-console [
-<span id="L796" class="LineNr"> 796 </span>    press ctrl-z
+<span id="L796" class="LineNr"> 796 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L797" class="LineNr"> 797 </span>  ]
 <span id="L798" class="LineNr"> 798 </span>  run [
-<span id="L799" class="LineNr"> 799 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L799" class="LineNr"> 799 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L800" class="LineNr"> 800 </span>  ]
 <span id="L801" class="LineNr"> 801 </span>  <span class="Comment"># cursor moved back</span>
 <span id="L802" class="LineNr"> 802 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L803" class="LineNr"> 803 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L804" class="LineNr"> 804 </span>  memory-should-contain [
-<span id="L805" class="LineNr"> 805 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L806" class="LineNr"> 806 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L805" class="LineNr"> 805 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L806" class="LineNr"> 806 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L807" class="LineNr"> 807 </span>  ]
 <span id="L808" class="LineNr"> 808 </span>  <span class="Comment"># scroll undone</span>
 <span id="L809" class="LineNr"> 809 </span>  screen-should-contain [
-<span id="L810" class="LineNr"> 810 </span>   <span class="Constant"> .     .</span>
-<span id="L811" class="LineNr"> 811 </span>   <span class="Constant"> .a    .</span>
-<span id="L812" class="LineNr"> 812 </span>   <span class="Constant"> .b    .</span>
-<span id="L813" class="LineNr"> 813 </span><span class="Constant">    .cdef↩.</span>
+<span id="L810" class="LineNr"> 810 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L811" class="LineNr"> 811 </span>  <span class="Conceal">¦</span><span class="Constant"> .a    .</span>
+<span id="L812" class="LineNr"> 812 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L813" class="LineNr"> 813 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .cdef↩.</span>
 <span id="L814" class="LineNr"> 814 </span>  ]
 <span id="L815" class="LineNr"> 815 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L816" class="LineNr"> 816 </span>  assume-console [
-<span id="L817" class="LineNr"> 817 </span>    type <span class="Constant">[1]</span>
+<span id="L817" class="LineNr"> 817 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L818" class="LineNr"> 818 </span>  ]
 <span id="L819" class="LineNr"> 819 </span>  run [
-<span id="L820" class="LineNr"> 820 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L820" class="LineNr"> 820 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L821" class="LineNr"> 821 </span>  ]
 <span id="L822" class="LineNr"> 822 </span>  screen-should-contain [
-<span id="L823" class="LineNr"> 823 </span>   <span class="Constant"> .     .</span>
-<span id="L824" class="LineNr"> 824 </span>   <span class="Constant"> .b    .</span>
-<span id="L825" class="LineNr"> 825 </span><span class="Constant">    .cde1↩.</span>
-<span id="L826" class="LineNr"> 826 </span>   <span class="Constant"> .fgh  .</span>
+<span id="L823" class="LineNr"> 823 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
+<span id="L824" class="LineNr"> 824 </span>  <span class="Conceal">¦</span><span class="Constant"> .b    .</span>
+<span id="L825" class="LineNr"> 825 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .cde1↩.</span>
+<span id="L826" class="LineNr"> 826 </span>  <span class="Conceal">¦</span><span class="Constant"> .fgh  .</span>
 <span id="L827" class="LineNr"> 827 </span>  ]
 <span id="L828" class="LineNr"> 828 </span>]
 <span id="L829" class="LineNr"> 829 </span>
@@ -899,37 +900,37 @@ if ('onhashchange' in window) {
 <span id="L838" class="LineNr"> 838 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L839" class="LineNr"> 839 </span>  <span class="Comment"># move the cursor</span>
 <span id="L840" class="LineNr"> 840 </span>  assume-console [
-<span id="L841" class="LineNr"> 841 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
-<span id="L842" class="LineNr"> 842 </span>    press left-arrow
+<span id="L841" class="LineNr"> 841 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
+<span id="L842" class="LineNr"> 842 </span>  <span class="Conceal">¦</span> press left-arrow
 <span id="L843" class="LineNr"> 843 </span>  ]
 <span id="L844" class="LineNr"> 844 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L845" class="LineNr"> 845 </span>  <span class="Comment"># undo</span>
 <span id="L846" class="LineNr"> 846 </span>  assume-console [
-<span id="L847" class="LineNr"> 847 </span>    press ctrl-z
+<span id="L847" class="LineNr"> 847 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L848" class="LineNr"> 848 </span>  ]
 <span id="L849" class="LineNr"> 849 </span>  run [
-<span id="L850" class="LineNr"> 850 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L850" class="LineNr"> 850 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L851" class="LineNr"> 851 </span>  ]
 <span id="L852" class="LineNr"> 852 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L853" class="LineNr"> 853 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L854" class="LineNr"> 854 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L855" class="LineNr"> 855 </span>  memory-should-contain [
-<span id="L856" class="LineNr"> 856 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L857" class="LineNr"> 857 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L856" class="LineNr"> 856 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L857" class="LineNr"> 857 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L858" class="LineNr"> 858 </span>  ]
 <span id="L859" class="LineNr"> 859 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L860" class="LineNr"> 860 </span>  assume-console [
-<span id="L861" class="LineNr"> 861 </span>    type <span class="Constant">[1]</span>
+<span id="L861" class="LineNr"> 861 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L862" class="LineNr"> 862 </span>  ]
 <span id="L863" class="LineNr"> 863 </span>  run [
-<span id="L864" class="LineNr"> 864 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L864" class="LineNr"> 864 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L865" class="LineNr"> 865 </span>  ]
 <span id="L866" class="LineNr"> 866 </span>  screen-should-contain [
-<span id="L867" class="LineNr"> 867 </span>   <span class="Constant"> .          .</span>
-<span id="L868" class="LineNr"> 868 </span>   <span class="Constant"> .abc       .</span>
-<span id="L869" class="LineNr"> 869 </span>   <span class="Constant"> .def       .</span>
-<span id="L870" class="LineNr"> 870 </span>   <span class="Constant"> .g1hi      .</span>
-<span id="L871" class="LineNr"> 871 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L867" class="LineNr"> 867 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L868" class="LineNr"> 868 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L869" class="LineNr"> 869 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L870" class="LineNr"> 870 </span>  <span class="Conceal">¦</span><span class="Constant"> .g1hi      .</span>
+<span id="L871" class="LineNr"> 871 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L872" class="LineNr"> 872 </span>  ]
 <span id="L873" class="LineNr"> 873 </span>]
 <span id="L874" class="LineNr"> 874 </span>
@@ -944,43 +945,43 @@ if ('onhashchange' in window) {
 <span id="L883" class="LineNr"> 883 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L884" class="LineNr"> 884 </span>  <span class="Comment"># move the cursor</span>
 <span id="L885" class="LineNr"> 885 </span>  assume-console [
-<span id="L886" class="LineNr"> 886 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
-<span id="L887" class="LineNr"> 887 </span>    press up-arrow
+<span id="L886" class="LineNr"> 886 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
+<span id="L887" class="LineNr"> 887 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L888" class="LineNr"> 888 </span>  ]
 <span id="L889" class="LineNr"> 889 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L890" class="LineNr"> 890 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L891" class="LineNr"> 891 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L892" class="LineNr"> 892 </span>  memory-should-contain [
-<span id="L893" class="LineNr"> 893 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L894" class="LineNr"> 894 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L893" class="LineNr"> 893 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L894" class="LineNr"> 894 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L895" class="LineNr"> 895 </span>  ]
 <span id="L896" class="LineNr"> 896 </span>  <span class="Comment"># undo</span>
 <span id="L897" class="LineNr"> 897 </span>  assume-console [
-<span id="L898" class="LineNr"> 898 </span>    press ctrl-z
+<span id="L898" class="LineNr"> 898 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L899" class="LineNr"> 899 </span>  ]
 <span id="L900" class="LineNr"> 900 </span>  run [
-<span id="L901" class="LineNr"> 901 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L901" class="LineNr"> 901 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L902" class="LineNr"> 902 </span>  ]
 <span id="L903" class="LineNr"> 903 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L904" class="LineNr"> 904 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L905" class="LineNr"> 905 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L906" class="LineNr"> 906 </span>  memory-should-contain [
-<span id="L907" class="LineNr"> 907 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L908" class="LineNr"> 908 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L907" class="LineNr"> 907 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L908" class="LineNr"> 908 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L909" class="LineNr"> 909 </span>  ]
 <span id="L910" class="LineNr"> 910 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L911" class="LineNr"> 911 </span>  assume-console [
-<span id="L912" class="LineNr"> 912 </span>    type <span class="Constant">[1]</span>
+<span id="L912" class="LineNr"> 912 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L913" class="LineNr"> 913 </span>  ]
 <span id="L914" class="LineNr"> 914 </span>  run [
-<span id="L915" class="LineNr"> 915 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L915" class="LineNr"> 915 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L916" class="LineNr"> 916 </span>  ]
 <span id="L917" class="LineNr"> 917 </span>  screen-should-contain [
-<span id="L918" class="LineNr"> 918 </span>   <span class="Constant"> .          .</span>
-<span id="L919" class="LineNr"> 919 </span>   <span class="Constant"> .abc       .</span>
-<span id="L920" class="LineNr"> 920 </span>   <span class="Constant"> .def       .</span>
-<span id="L921" class="LineNr"> 921 </span>   <span class="Constant"> .g1hi      .</span>
-<span id="L922" class="LineNr"> 922 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L918" class="LineNr"> 918 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L919" class="LineNr"> 919 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L920" class="LineNr"> 920 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L921" class="LineNr"> 921 </span>  <span class="Conceal">¦</span><span class="Constant"> .g1hi      .</span>
+<span id="L922" class="LineNr"> 922 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L923" class="LineNr"> 923 </span>  ]
 <span id="L924" class="LineNr"> 924 </span>]
 <span id="L925" class="LineNr"> 925 </span>
@@ -995,37 +996,37 @@ if ('onhashchange' in window) {
 <span id="L934" class="LineNr"> 934 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L935" class="LineNr"> 935 </span>  <span class="Comment"># move the cursor</span>
 <span id="L936" class="LineNr"> 936 </span>  assume-console [
-<span id="L937" class="LineNr"> 937 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L938" class="LineNr"> 938 </span>    press down-arrow
+<span id="L937" class="LineNr"> 937 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L938" class="LineNr"> 938 </span>  <span class="Conceal">¦</span> press down-arrow
 <span id="L939" class="LineNr"> 939 </span>  ]
 <span id="L940" class="LineNr"> 940 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L941" class="LineNr"> 941 </span>  <span class="Comment"># undo</span>
 <span id="L942" class="LineNr"> 942 </span>  assume-console [
-<span id="L943" class="LineNr"> 943 </span>    press ctrl-z
+<span id="L943" class="LineNr"> 943 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L944" class="LineNr"> 944 </span>  ]
 <span id="L945" class="LineNr"> 945 </span>  run [
-<span id="L946" class="LineNr"> 946 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L946" class="LineNr"> 946 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L947" class="LineNr"> 947 </span>  ]
 <span id="L948" class="LineNr"> 948 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L949" class="LineNr"> 949 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L950" class="LineNr"> 950 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L951" class="LineNr"> 951 </span>  memory-should-contain [
-<span id="L952" class="LineNr"> 952 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L953" class="LineNr"> 953 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L952" class="LineNr"> 952 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L953" class="LineNr"> 953 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L954" class="LineNr"> 954 </span>  ]
 <span id="L955" class="LineNr"> 955 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L956" class="LineNr"> 956 </span>  assume-console [
-<span id="L957" class="LineNr"> 957 </span>    type <span class="Constant">[1]</span>
+<span id="L957" class="LineNr"> 957 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L958" class="LineNr"> 958 </span>  ]
 <span id="L959" class="LineNr"> 959 </span>  run [
-<span id="L960" class="LineNr"> 960 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L960" class="LineNr"> 960 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L961" class="LineNr"> 961 </span>  ]
 <span id="L962" class="LineNr"> 962 </span>  screen-should-contain [
-<span id="L963" class="LineNr"> 963 </span>   <span class="Constant"> .          .</span>
-<span id="L964" class="LineNr"> 964 </span>   <span class="Constant"> .abc       .</span>
-<span id="L965" class="LineNr"> 965 </span>   <span class="Constant"> .d1ef      .</span>
-<span id="L966" class="LineNr"> 966 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L967" class="LineNr"> 967 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L963" class="LineNr"> 963 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L964" class="LineNr"> 964 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L965" class="LineNr"> 965 </span>  <span class="Conceal">¦</span><span class="Constant"> .d1ef      .</span>
+<span id="L966" class="LineNr"> 966 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L967" class="LineNr"> 967 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L968" class="LineNr"> 968 </span>  ]
 <span id="L969" class="LineNr"> 969 </span>]
 <span id="L970" class="LineNr"> 970 </span>
@@ -1043,23 +1044,23 @@ if ('onhashchange' in window) {
 <span id="L982" class="LineNr"> 982 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L983" class="LineNr"> 983 </span>  <span class="Comment"># scroll the page</span>
 <span id="L984" class="LineNr"> 984 </span>  assume-console [
-<span id="L985" class="LineNr"> 985 </span>    press ctrl-f
+<span id="L985" class="LineNr"> 985 </span>  <span class="Conceal">¦</span> press ctrl-f
 <span id="L986" class="LineNr"> 986 </span>  ]
 <span id="L987" class="LineNr"> 987 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L988" class="LineNr"> 988 </span>  <span class="Comment"># undo</span>
 <span id="L989" class="LineNr"> 989 </span>  assume-console [
-<span id="L990" class="LineNr"> 990 </span>    press ctrl-z
+<span id="L990" class="LineNr"> 990 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L991" class="LineNr"> 991 </span>  ]
 <span id="L992" class="LineNr"> 992 </span>  run [
-<span id="L993" class="LineNr"> 993 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L993" class="LineNr"> 993 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L994" class="LineNr"> 994 </span>  ]
 <span id="L995" class="LineNr"> 995 </span>  <span class="Comment"># screen should again show page 1</span>
 <span id="L996" class="LineNr"> 996 </span>  screen-should-contain [
-<span id="L997" class="LineNr"> 997 </span>   <span class="Constant"> .          .</span>
-<span id="L998" class="LineNr"> 998 </span>   <span class="Constant"> .a         .</span>
-<span id="L999" class="LineNr"> 999 </span>   <span class="Constant"> .b         .</span>
-<span id="L1000" class="LineNr">1000 </span>   <span class="Constant"> .c         .</span>
-<span id="L1001" class="LineNr">1001 </span>   <span class="Constant"> .d         .</span>
+<span id="L997" class="LineNr"> 997 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L998" class="LineNr"> 998 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L999" class="LineNr"> 999 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L1000" class="LineNr">1000 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L1001" class="LineNr">1001 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
 <span id="L1002" class="LineNr">1002 </span>  ]
 <span id="L1003" class="LineNr">1003 </span>]
 <span id="L1004" class="LineNr">1004 </span>
@@ -1077,23 +1078,23 @@ if ('onhashchange' in window) {
 <span id="L1016" class="LineNr">1016 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1017" class="LineNr">1017 </span>  <span class="Comment"># scroll the page</span>
 <span id="L1018" class="LineNr">1018 </span>  assume-console [
-<span id="L1019" class="LineNr">1019 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1019" class="LineNr">1019 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
 <span id="L1020" class="LineNr">1020 </span>  ]
 <span id="L1021" class="LineNr">1021 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1022" class="LineNr">1022 </span>  <span class="Comment"># undo</span>
 <span id="L1023" class="LineNr">1023 </span>  assume-console [
-<span id="L1024" class="LineNr">1024 </span>    press ctrl-z
+<span id="L1024" class="LineNr">1024 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1025" class="LineNr">1025 </span>  ]
 <span id="L1026" class="LineNr">1026 </span>  run [
-<span id="L1027" class="LineNr">1027 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1027" class="LineNr">1027 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1028" class="LineNr">1028 </span>  ]
 <span id="L1029" class="LineNr">1029 </span>  <span class="Comment"># screen should again show page 1</span>
 <span id="L1030" class="LineNr">1030 </span>  screen-should-contain [
-<span id="L1031" class="LineNr">1031 </span>   <span class="Constant"> .          .</span>
-<span id="L1032" class="LineNr">1032 </span>   <span class="Constant"> .a         .</span>
-<span id="L1033" class="LineNr">1033 </span>   <span class="Constant"> .b         .</span>
-<span id="L1034" class="LineNr">1034 </span>   <span class="Constant"> .c         .</span>
-<span id="L1035" class="LineNr">1035 </span>   <span class="Constant"> .d         .</span>
+<span id="L1031" class="LineNr">1031 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1032" class="LineNr">1032 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L1033" class="LineNr">1033 </span>  <span class="Conceal">¦</span><span class="Constant"> .b         .</span>
+<span id="L1034" class="LineNr">1034 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L1035" class="LineNr">1035 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
 <span id="L1036" class="LineNr">1036 </span>  ]
 <span id="L1037" class="LineNr">1037 </span>]
 <span id="L1038" class="LineNr">1038 </span>
@@ -1111,24 +1112,24 @@ if ('onhashchange' in window) {
 <span id="L1050" class="LineNr">1050 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1051" class="LineNr">1051 </span>  <span class="Comment"># scroll the page down and up</span>
 <span id="L1052" class="LineNr">1052 </span>  assume-console [
-<span id="L1053" class="LineNr">1053 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1054" class="LineNr">1054 </span>    press ctrl-b
+<span id="L1053" class="LineNr">1053 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1054" class="LineNr">1054 </span>  <span class="Conceal">¦</span> press ctrl-b
 <span id="L1055" class="LineNr">1055 </span>  ]
 <span id="L1056" class="LineNr">1056 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1057" class="LineNr">1057 </span>  <span class="Comment"># undo</span>
 <span id="L1058" class="LineNr">1058 </span>  assume-console [
-<span id="L1059" class="LineNr">1059 </span>    press ctrl-z
+<span id="L1059" class="LineNr">1059 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1060" class="LineNr">1060 </span>  ]
 <span id="L1061" class="LineNr">1061 </span>  run [
-<span id="L1062" class="LineNr">1062 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1062" class="LineNr">1062 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1063" class="LineNr">1063 </span>  ]
 <span id="L1064" class="LineNr">1064 </span>  <span class="Comment"># screen should again show page 2</span>
 <span id="L1065" class="LineNr">1065 </span>  screen-should-contain [
-<span id="L1066" class="LineNr">1066 </span>   <span class="Constant"> .          .</span>
-<span id="L1067" class="LineNr">1067 </span>   <span class="Constant"> .d         .</span>
-<span id="L1068" class="LineNr">1068 </span>   <span class="Constant"> .e         .</span>
-<span id="L1069" class="LineNr">1069 </span>   <span class="Constant"> .f         .</span>
-<span id="L1070" class="LineNr">1070 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1066" class="LineNr">1066 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1067" class="LineNr">1067 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L1068" class="LineNr">1068 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L1069" class="LineNr">1069 </span>  <span class="Conceal">¦</span><span class="Constant"> .f         .</span>
+<span id="L1070" class="LineNr">1070 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1071" class="LineNr">1071 </span>  ]
 <span id="L1072" class="LineNr">1072 </span>]
 <span id="L1073" class="LineNr">1073 </span>
@@ -1146,24 +1147,24 @@ if ('onhashchange' in window) {
 <span id="L1085" class="LineNr">1085 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1086" class="LineNr">1086 </span>  <span class="Comment"># scroll the page down and up</span>
 <span id="L1087" class="LineNr">1087 </span>  assume-console [
-<span id="L1088" class="LineNr">1088 </span>    press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1089" class="LineNr">1089 </span>    press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1088" class="LineNr">1088 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1089" class="LineNr">1089 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
 <span id="L1090" class="LineNr">1090 </span>  ]
 <span id="L1091" class="LineNr">1091 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1092" class="LineNr">1092 </span>  <span class="Comment"># undo</span>
 <span id="L1093" class="LineNr">1093 </span>  assume-console [
-<span id="L1094" class="LineNr">1094 </span>    press ctrl-z
+<span id="L1094" class="LineNr">1094 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1095" class="LineNr">1095 </span>  ]
 <span id="L1096" class="LineNr">1096 </span>  run [
-<span id="L1097" class="LineNr">1097 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1097" class="LineNr">1097 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1098" class="LineNr">1098 </span>  ]
 <span id="L1099" class="LineNr">1099 </span>  <span class="Comment"># screen should again show page 2</span>
 <span id="L1100" class="LineNr">1100 </span>  screen-should-contain [
-<span id="L1101" class="LineNr">1101 </span>   <span class="Constant"> .          .</span>
-<span id="L1102" class="LineNr">1102 </span>   <span class="Constant"> .d         .</span>
-<span id="L1103" class="LineNr">1103 </span>   <span class="Constant"> .e         .</span>
-<span id="L1104" class="LineNr">1104 </span>   <span class="Constant"> .f         .</span>
-<span id="L1105" class="LineNr">1105 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1101" class="LineNr">1101 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1102" class="LineNr">1102 </span>  <span class="Conceal">¦</span><span class="Constant"> .d         .</span>
+<span id="L1103" class="LineNr">1103 </span>  <span class="Conceal">¦</span><span class="Constant"> .e         .</span>
+<span id="L1104" class="LineNr">1104 </span>  <span class="Conceal">¦</span><span class="Constant"> .f         .</span>
+<span id="L1105" class="LineNr">1105 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1106" class="LineNr">1106 </span>  ]
 <span id="L1107" class="LineNr">1107 </span>]
 <span id="L1108" class="LineNr">1108 </span>
@@ -1178,37 +1179,37 @@ if ('onhashchange' in window) {
 <span id="L1117" class="LineNr">1117 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1118" class="LineNr">1118 </span>  <span class="Comment"># move the cursor, then to start of line</span>
 <span id="L1119" class="LineNr">1119 </span>  assume-console [
-<span id="L1120" class="LineNr">1120 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1121" class="LineNr">1121 </span>    press ctrl-a
+<span id="L1120" class="LineNr">1120 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1121" class="LineNr">1121 </span>  <span class="Conceal">¦</span> press ctrl-a
 <span id="L1122" class="LineNr">1122 </span>  ]
 <span id="L1123" class="LineNr">1123 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1124" class="LineNr">1124 </span>  <span class="Comment"># undo</span>
 <span id="L1125" class="LineNr">1125 </span>  assume-console [
-<span id="L1126" class="LineNr">1126 </span>    press ctrl-z
+<span id="L1126" class="LineNr">1126 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1127" class="LineNr">1127 </span>  ]
 <span id="L1128" class="LineNr">1128 </span>  run [
-<span id="L1129" class="LineNr">1129 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1129" class="LineNr">1129 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1130" class="LineNr">1130 </span>  ]
 <span id="L1131" class="LineNr">1131 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L1132" class="LineNr">1132 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1133" class="LineNr">1133 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1134" class="LineNr">1134 </span>  memory-should-contain [
-<span id="L1135" class="LineNr">1135 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1136" class="LineNr">1136 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1135" class="LineNr">1135 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1136" class="LineNr">1136 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1137" class="LineNr">1137 </span>  ]
 <span id="L1138" class="LineNr">1138 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L1139" class="LineNr">1139 </span>  assume-console [
-<span id="L1140" class="LineNr">1140 </span>    type <span class="Constant">[1]</span>
+<span id="L1140" class="LineNr">1140 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L1141" class="LineNr">1141 </span>  ]
 <span id="L1142" class="LineNr">1142 </span>  run [
-<span id="L1143" class="LineNr">1143 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1143" class="LineNr">1143 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1144" class="LineNr">1144 </span>  ]
 <span id="L1145" class="LineNr">1145 </span>  screen-should-contain [
-<span id="L1146" class="LineNr">1146 </span>   <span class="Constant"> .          .</span>
-<span id="L1147" class="LineNr">1147 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1148" class="LineNr">1148 </span>   <span class="Constant"> .d1ef      .</span>
-<span id="L1149" class="LineNr">1149 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L1150" class="LineNr">1150 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1146" class="LineNr">1146 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1147" class="LineNr">1147 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1148" class="LineNr">1148 </span>  <span class="Conceal">¦</span><span class="Constant"> .d1ef      .</span>
+<span id="L1149" class="LineNr">1149 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L1150" class="LineNr">1150 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1151" class="LineNr">1151 </span>  ]
 <span id="L1152" class="LineNr">1152 </span>]
 <span id="L1153" class="LineNr">1153 </span>
@@ -1223,37 +1224,37 @@ if ('onhashchange' in window) {
 <span id="L1162" class="LineNr">1162 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1163" class="LineNr">1163 </span>  <span class="Comment"># move the cursor, then to start of line</span>
 <span id="L1164" class="LineNr">1164 </span>  assume-console [
-<span id="L1165" class="LineNr">1165 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1166" class="LineNr">1166 </span>    press home
+<span id="L1165" class="LineNr">1165 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1166" class="LineNr">1166 </span>  <span class="Conceal">¦</span> press home
 <span id="L1167" class="LineNr">1167 </span>  ]
 <span id="L1168" class="LineNr">1168 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1169" class="LineNr">1169 </span>  <span class="Comment"># undo</span>
 <span id="L1170" class="LineNr">1170 </span>  assume-console [
-<span id="L1171" class="LineNr">1171 </span>    press ctrl-z
+<span id="L1171" class="LineNr">1171 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1172" class="LineNr">1172 </span>  ]
 <span id="L1173" class="LineNr">1173 </span>  run [
-<span id="L1174" class="LineNr">1174 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1174" class="LineNr">1174 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1175" class="LineNr">1175 </span>  ]
 <span id="L1176" class="LineNr">1176 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L1177" class="LineNr">1177 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1178" class="LineNr">1178 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1179" class="LineNr">1179 </span>  memory-should-contain [
-<span id="L1180" class="LineNr">1180 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1181" class="LineNr">1181 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1180" class="LineNr">1180 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1181" class="LineNr">1181 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1182" class="LineNr">1182 </span>  ]
 <span id="L1183" class="LineNr">1183 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L1184" class="LineNr">1184 </span>  assume-console [
-<span id="L1185" class="LineNr">1185 </span>    type <span class="Constant">[1]</span>
+<span id="L1185" class="LineNr">1185 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L1186" class="LineNr">1186 </span>  ]
 <span id="L1187" class="LineNr">1187 </span>  run [
-<span id="L1188" class="LineNr">1188 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1188" class="LineNr">1188 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1189" class="LineNr">1189 </span>  ]
 <span id="L1190" class="LineNr">1190 </span>  screen-should-contain [
-<span id="L1191" class="LineNr">1191 </span>   <span class="Constant"> .          .</span>
-<span id="L1192" class="LineNr">1192 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1193" class="LineNr">1193 </span>   <span class="Constant"> .d1ef      .</span>
-<span id="L1194" class="LineNr">1194 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L1195" class="LineNr">1195 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1191" class="LineNr">1191 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1192" class="LineNr">1192 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1193" class="LineNr">1193 </span>  <span class="Conceal">¦</span><span class="Constant"> .d1ef      .</span>
+<span id="L1194" class="LineNr">1194 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L1195" class="LineNr">1195 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1196" class="LineNr">1196 </span>  ]
 <span id="L1197" class="LineNr">1197 </span>]
 <span id="L1198" class="LineNr">1198 </span>
@@ -1268,37 +1269,37 @@ if ('onhashchange' in window) {
 <span id="L1207" class="LineNr">1207 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1208" class="LineNr">1208 </span>  <span class="Comment"># move the cursor, then to start of line</span>
 <span id="L1209" class="LineNr">1209 </span>  assume-console [
-<span id="L1210" class="LineNr">1210 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1211" class="LineNr">1211 </span>    press ctrl-e
+<span id="L1210" class="LineNr">1210 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1211" class="LineNr">1211 </span>  <span class="Conceal">¦</span> press ctrl-e
 <span id="L1212" class="LineNr">1212 </span>  ]
 <span id="L1213" class="LineNr">1213 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1214" class="LineNr">1214 </span>  <span class="Comment"># undo</span>
 <span id="L1215" class="LineNr">1215 </span>  assume-console [
-<span id="L1216" class="LineNr">1216 </span>    press ctrl-z
+<span id="L1216" class="LineNr">1216 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1217" class="LineNr">1217 </span>  ]
 <span id="L1218" class="LineNr">1218 </span>  run [
-<span id="L1219" class="LineNr">1219 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1219" class="LineNr">1219 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1220" class="LineNr">1220 </span>  ]
 <span id="L1221" class="LineNr">1221 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L1222" class="LineNr">1222 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1223" class="LineNr">1223 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1224" class="LineNr">1224 </span>  memory-should-contain [
-<span id="L1225" class="LineNr">1225 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1226" class="LineNr">1226 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1225" class="LineNr">1225 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1226" class="LineNr">1226 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1227" class="LineNr">1227 </span>  ]
 <span id="L1228" class="LineNr">1228 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L1229" class="LineNr">1229 </span>  assume-console [
-<span id="L1230" class="LineNr">1230 </span>    type <span class="Constant">[1]</span>
+<span id="L1230" class="LineNr">1230 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L1231" class="LineNr">1231 </span>  ]
 <span id="L1232" class="LineNr">1232 </span>  run [
-<span id="L1233" class="LineNr">1233 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1233" class="LineNr">1233 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1234" class="LineNr">1234 </span>  ]
 <span id="L1235" class="LineNr">1235 </span>  screen-should-contain [
-<span id="L1236" class="LineNr">1236 </span>   <span class="Constant"> .          .</span>
-<span id="L1237" class="LineNr">1237 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1238" class="LineNr">1238 </span>   <span class="Constant"> .d1ef      .</span>
-<span id="L1239" class="LineNr">1239 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L1240" class="LineNr">1240 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1236" class="LineNr">1236 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1237" class="LineNr">1237 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1238" class="LineNr">1238 </span>  <span class="Conceal">¦</span><span class="Constant"> .d1ef      .</span>
+<span id="L1239" class="LineNr">1239 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L1240" class="LineNr">1240 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1241" class="LineNr">1241 </span>  ]
 <span id="L1242" class="LineNr">1242 </span>]
 <span id="L1243" class="LineNr">1243 </span>
@@ -1313,37 +1314,37 @@ if ('onhashchange' in window) {
 <span id="L1252" class="LineNr">1252 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1253" class="LineNr">1253 </span>  <span class="Comment"># move the cursor, then to start of line</span>
 <span id="L1254" class="LineNr">1254 </span>  assume-console [
-<span id="L1255" class="LineNr">1255 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1256" class="LineNr">1256 </span>    press end
+<span id="L1255" class="LineNr">1255 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1256" class="LineNr">1256 </span>  <span class="Conceal">¦</span> press end
 <span id="L1257" class="LineNr">1257 </span>  ]
 <span id="L1258" class="LineNr">1258 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1259" class="LineNr">1259 </span>  <span class="Comment"># undo</span>
 <span id="L1260" class="LineNr">1260 </span>  assume-console [
-<span id="L1261" class="LineNr">1261 </span>    press ctrl-z
+<span id="L1261" class="LineNr">1261 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1262" class="LineNr">1262 </span>  ]
 <span id="L1263" class="LineNr">1263 </span>  run [
-<span id="L1264" class="LineNr">1264 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1264" class="LineNr">1264 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1265" class="LineNr">1265 </span>  ]
 <span id="L1266" class="LineNr">1266 </span>  <span class="Comment"># cursor moves back</span>
 <span id="L1267" class="LineNr">1267 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1268" class="LineNr">1268 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1269" class="LineNr">1269 </span>  memory-should-contain [
-<span id="L1270" class="LineNr">1270 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1271" class="LineNr">1271 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1270" class="LineNr">1270 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1271" class="LineNr">1271 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1272" class="LineNr">1272 </span>  ]
 <span id="L1273" class="LineNr">1273 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L1274" class="LineNr">1274 </span>  assume-console [
-<span id="L1275" class="LineNr">1275 </span>    type <span class="Constant">[1]</span>
+<span id="L1275" class="LineNr">1275 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L1276" class="LineNr">1276 </span>  ]
 <span id="L1277" class="LineNr">1277 </span>  run [
-<span id="L1278" class="LineNr">1278 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1278" class="LineNr">1278 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1279" class="LineNr">1279 </span>  ]
 <span id="L1280" class="LineNr">1280 </span>  screen-should-contain [
-<span id="L1281" class="LineNr">1281 </span>   <span class="Constant"> .          .</span>
-<span id="L1282" class="LineNr">1282 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1283" class="LineNr">1283 </span>   <span class="Constant"> .d1ef      .</span>
-<span id="L1284" class="LineNr">1284 </span>   <span class="Constant"> .ghi       .</span>
-<span id="L1285" class="LineNr">1285 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1281" class="LineNr">1281 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1282" class="LineNr">1282 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1283" class="LineNr">1283 </span>  <span class="Conceal">¦</span><span class="Constant"> .d1ef      .</span>
+<span id="L1284" class="LineNr">1284 </span>  <span class="Conceal">¦</span><span class="Constant"> .ghi       .</span>
+<span id="L1285" class="LineNr">1285 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1286" class="LineNr">1286 </span>  ]
 <span id="L1287" class="LineNr">1287 </span>]
 <span id="L1288" class="LineNr">1288 </span>
@@ -1358,45 +1359,45 @@ if ('onhashchange' in window) {
 <span id="L1297" class="LineNr">1297 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1298" class="LineNr">1298 </span>  <span class="Comment"># move the cursor</span>
 <span id="L1299" class="LineNr">1299 </span>  assume-console [
-<span id="L1300" class="LineNr">1300 </span>    left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
-<span id="L1301" class="LineNr">1301 </span>    press right-arrow
-<span id="L1302" class="LineNr">1302 </span>    press right-arrow
-<span id="L1303" class="LineNr">1303 </span>    press up-arrow
+<span id="L1300" class="LineNr">1300 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 1</span>
+<span id="L1301" class="LineNr">1301 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L1302" class="LineNr">1302 </span>  <span class="Conceal">¦</span> press right-arrow
+<span id="L1303" class="LineNr">1303 </span>  <span class="Conceal">¦</span> press up-arrow
 <span id="L1304" class="LineNr">1304 </span>  ]
 <span id="L1305" class="LineNr">1305 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1306" class="LineNr">1306 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1307" class="LineNr">1307 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1308" class="LineNr">1308 </span>  memory-should-contain [
-<span id="L1309" class="LineNr">1309 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1310" class="LineNr">1310 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1309" class="LineNr">1309 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1310" class="LineNr">1310 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1311" class="LineNr">1311 </span>  ]
 <span id="L1312" class="LineNr">1312 </span>  <span class="Comment"># undo</span>
 <span id="L1313" class="LineNr">1313 </span>  assume-console [
-<span id="L1314" class="LineNr">1314 </span>    press ctrl-z
+<span id="L1314" class="LineNr">1314 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1315" class="LineNr">1315 </span>  ]
 <span id="L1316" class="LineNr">1316 </span>  run [
-<span id="L1317" class="LineNr">1317 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1317" class="LineNr">1317 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1318" class="LineNr">1318 </span>  ]
 <span id="L1319" class="LineNr">1319 </span>  <span class="Comment"># up-arrow is undone</span>
 <span id="L1320" class="LineNr">1320 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1321" class="LineNr">1321 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1322" class="LineNr">1322 </span>  memory-should-contain [
-<span id="L1323" class="LineNr">1323 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1324" class="LineNr">1324 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1323" class="LineNr">1323 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1324" class="LineNr">1324 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1325" class="LineNr">1325 </span>  ]
 <span id="L1326" class="LineNr">1326 </span>  <span class="Comment"># undo again</span>
 <span id="L1327" class="LineNr">1327 </span>  assume-console [
-<span id="L1328" class="LineNr">1328 </span>    press ctrl-z
+<span id="L1328" class="LineNr">1328 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1329" class="LineNr">1329 </span>  ]
 <span id="L1330" class="LineNr">1330 </span>  run [
-<span id="L1331" class="LineNr">1331 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1331" class="LineNr">1331 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1332" class="LineNr">1332 </span>  ]
 <span id="L1333" class="LineNr">1333 </span>  <span class="Comment"># both right-arrows are undone</span>
 <span id="L1334" class="LineNr">1334 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1335" class="LineNr">1335 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1336" class="LineNr">1336 </span>  memory-should-contain [
-<span id="L1337" class="LineNr">1337 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
-<span id="L1338" class="LineNr">1338 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1337" class="LineNr">1337 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1338" class="LineNr">1338 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1339" class="LineNr">1339 </span>  ]
 <span id="L1340" class="LineNr">1340 </span>]
 <span id="L1341" class="LineNr">1341 </span>
@@ -1412,51 +1413,51 @@ if ('onhashchange' in window) {
 <span id="L1351" class="LineNr">1351 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> contents, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1352" class="LineNr">1352 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1353" class="LineNr">1353 </span>  assume-console [
-<span id="L1354" class="LineNr">1354 </span>    left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
-<span id="L1355" class="LineNr">1355 </span>    press ctrl-z
+<span id="L1354" class="LineNr">1354 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 3</span>,<span class="Constant"> 1</span>
+<span id="L1355" class="LineNr">1355 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1356" class="LineNr">1356 </span>  ]
 <span id="L1357" class="LineNr">1357 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1358" class="LineNr">1358 </span>  <span class="Comment"># redo</span>
 <span id="L1359" class="LineNr">1359 </span>  assume-console [
-<span id="L1360" class="LineNr">1360 </span>    press ctrl-y
+<span id="L1360" class="LineNr">1360 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1361" class="LineNr">1361 </span>  ]
 <span id="L1362" class="LineNr">1362 </span>  run [
-<span id="L1363" class="LineNr">1363 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1363" class="LineNr">1363 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1364" class="LineNr">1364 </span>  ]
 <span id="L1365" class="LineNr">1365 </span>  <span class="Comment"># cursor moves to left-click</span>
 <span id="L1366" class="LineNr">1366 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1367" class="LineNr">1367 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1368" class="LineNr">1368 </span>  memory-should-contain [
-<span id="L1369" class="LineNr">1369 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
-<span id="L1370" class="LineNr">1370 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1369" class="LineNr">1369 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1370" class="LineNr">1370 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1371" class="LineNr">1371 </span>  ]
 <span id="L1372" class="LineNr">1372 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L1373" class="LineNr">1373 </span>  assume-console [
-<span id="L1374" class="LineNr">1374 </span>    type <span class="Constant">[1]</span>
+<span id="L1374" class="LineNr">1374 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L1375" class="LineNr">1375 </span>  ]
 <span id="L1376" class="LineNr">1376 </span>  run [
-<span id="L1377" class="LineNr">1377 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1377" class="LineNr">1377 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1378" class="LineNr">1378 </span>  ]
 <span id="L1379" class="LineNr">1379 </span>  screen-should-contain [
-<span id="L1380" class="LineNr">1380 </span>   <span class="Constant"> .          .</span>
-<span id="L1381" class="LineNr">1381 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1382" class="LineNr">1382 </span>   <span class="Constant"> .def       .</span>
-<span id="L1383" class="LineNr">1383 </span>   <span class="Constant"> .g1hi      .</span>
-<span id="L1384" class="LineNr">1384 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1380" class="LineNr">1380 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1381" class="LineNr">1381 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1382" class="LineNr">1382 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L1383" class="LineNr">1383 </span>  <span class="Conceal">¦</span><span class="Constant"> .g1hi      .</span>
+<span id="L1384" class="LineNr">1384 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
 <span id="L1385" class="LineNr">1385 </span>  ]
 <span id="L1386" class="LineNr">1386 </span>]
 <span id="L1387" class="LineNr">1387 </span>
 <span id="L1388" class="LineNr">1388 </span><span class="muRecipe">after</span> <span class="Constant"><a href='012-editor-undo.mu.html#L94'>&lt;handle-redo&gt;</a></span> [
 <span id="L1389" class="LineNr">1389 </span>  <span class="Delimiter">{</span>
-<span id="L1390" class="LineNr">1390 </span>    move:<a href='012-editor-undo.mu.html#L26'>move-operation</a>, is-move?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">move:variant</span>
-<span id="L1391" class="LineNr">1391 </span>    <span class="muControl">break-unless</span> is-move?
-<span id="L1392" class="LineNr">1392 </span>    <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
-<span id="L1393" class="LineNr">1393 </span>    cursor-row <span class="Special">&lt;-</span> get move, <span class="Constant">after-row:offset</span>
-<span id="L1394" class="LineNr">1394 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L1395" class="LineNr">1395 </span>    cursor-column <span class="Special">&lt;-</span> get move, <span class="Constant">after-column:offset</span>
-<span id="L1396" class="LineNr">1396 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L1397" class="LineNr">1397 </span>    top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get move, <span class="Constant">after-top-of-screen:offset</span>
-<span id="L1398" class="LineNr">1398 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
+<span id="L1390" class="LineNr">1390 </span>  <span class="Conceal">¦</span> move:<a href='012-editor-undo.mu.html#L26'>move-operation</a>, is-move?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">move:variant</span>
+<span id="L1391" class="LineNr">1391 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-move?
+<span id="L1392" class="LineNr">1392 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
+<span id="L1393" class="LineNr">1393 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get move, <span class="Constant">after-row:offset</span>
+<span id="L1394" class="LineNr">1394 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L1395" class="LineNr">1395 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> get move, <span class="Constant">after-column:offset</span>
+<span id="L1396" class="LineNr">1396 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L1397" class="LineNr">1397 </span>  <span class="Conceal">¦</span> top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get move, <span class="Constant">after-top-of-screen:offset</span>
+<span id="L1398" class="LineNr">1398 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
 <span id="L1399" class="LineNr">1399 </span>  <span class="Delimiter">}</span>
 <span id="L1400" class="LineNr">1400 </span>]
 <span id="L1401" class="LineNr">1401 </span>
@@ -1467,143 +1468,143 @@ if ('onhashchange' in window) {
 <span id="L1406" class="LineNr">1406 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
 <span id="L1407" class="LineNr">1407 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1408" class="LineNr">1408 </span>  assume-console [
-<span id="L1409" class="LineNr">1409 </span>    type <span class="Constant">[abc]</span>
-<span id="L1410" class="LineNr">1410 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L1411" class="LineNr">1411 </span>    type <span class="Constant">[d]</span>
+<span id="L1409" class="LineNr">1409 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abc]</span>
+<span id="L1410" class="LineNr">1410 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L1411" class="LineNr">1411 </span>  <span class="Conceal">¦</span> type <span class="Constant">[d]</span>
 <span id="L1412" class="LineNr">1412 </span>  ]
 <span id="L1413" class="LineNr">1413 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1414" class="LineNr">1414 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1415" class="LineNr">1415 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1416" class="LineNr">1416 </span>  screen-should-contain [
-<span id="L1417" class="LineNr">1417 </span>   <span class="Constant"> .          .</span>
-<span id="L1418" class="LineNr">1418 </span>   <span class="Constant"> .adbc      .</span>
-<span id="L1419" class="LineNr">1419 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1420" class="LineNr">1420 </span>   <span class="Constant"> .          .</span>
+<span id="L1417" class="LineNr">1417 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1418" class="LineNr">1418 </span>  <span class="Conceal">¦</span><span class="Constant"> .adbc      .</span>
+<span id="L1419" class="LineNr">1419 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1420" class="LineNr">1420 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1421" class="LineNr">1421 </span>  ]
 <span id="L1422" class="LineNr">1422 </span>  memory-should-contain [
-<span id="L1423" class="LineNr">1423 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1424" class="LineNr">1424 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1423" class="LineNr">1423 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1424" class="LineNr">1424 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L1425" class="LineNr">1425 </span>  ]
 <span id="L1426" class="LineNr">1426 </span>  <span class="Comment"># undo</span>
 <span id="L1427" class="LineNr">1427 </span>  assume-console [
-<span id="L1428" class="LineNr">1428 </span>    press ctrl-z
+<span id="L1428" class="LineNr">1428 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1429" class="LineNr">1429 </span>  ]
 <span id="L1430" class="LineNr">1430 </span>  run [
-<span id="L1431" class="LineNr">1431 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1432" class="LineNr">1432 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1433" class="LineNr">1433 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1431" class="LineNr">1431 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1432" class="LineNr">1432 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1433" class="LineNr">1433 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1434" class="LineNr">1434 </span>  ]
 <span id="L1435" class="LineNr">1435 </span>  <span class="Comment"># last letter typed is deleted</span>
 <span id="L1436" class="LineNr">1436 </span>  screen-should-contain [
-<span id="L1437" class="LineNr">1437 </span>   <span class="Constant"> .          .</span>
-<span id="L1438" class="LineNr">1438 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1439" class="LineNr">1439 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1440" class="LineNr">1440 </span>   <span class="Constant"> .          .</span>
+<span id="L1437" class="LineNr">1437 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1438" class="LineNr">1438 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1439" class="LineNr">1439 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1440" class="LineNr">1440 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1441" class="LineNr">1441 </span>  ]
 <span id="L1442" class="LineNr">1442 </span>  memory-should-contain [
-<span id="L1443" class="LineNr">1443 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1444" class="LineNr">1444 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1443" class="LineNr">1443 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1444" class="LineNr">1444 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1445" class="LineNr">1445 </span>  ]
 <span id="L1446" class="LineNr">1446 </span>  <span class="Comment"># undo again</span>
 <span id="L1447" class="LineNr">1447 </span>  assume-console [
-<span id="L1448" class="LineNr">1448 </span>    press ctrl-z
+<span id="L1448" class="LineNr">1448 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1449" class="LineNr">1449 </span>  ]
 <span id="L1450" class="LineNr">1450 </span>  run [
-<span id="L1451" class="LineNr">1451 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1452" class="LineNr">1452 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1453" class="LineNr">1453 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1451" class="LineNr">1451 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1452" class="LineNr">1452 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1453" class="LineNr">1453 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1454" class="LineNr">1454 </span>  ]
 <span id="L1455" class="LineNr">1455 </span>  <span class="Comment"># no change to screen; cursor moves</span>
 <span id="L1456" class="LineNr">1456 </span>  screen-should-contain [
-<span id="L1457" class="LineNr">1457 </span>   <span class="Constant"> .          .</span>
-<span id="L1458" class="LineNr">1458 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1459" class="LineNr">1459 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1460" class="LineNr">1460 </span>   <span class="Constant"> .          .</span>
+<span id="L1457" class="LineNr">1457 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1458" class="LineNr">1458 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1459" class="LineNr">1459 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1460" class="LineNr">1460 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1461" class="LineNr">1461 </span>  ]
 <span id="L1462" class="LineNr">1462 </span>  memory-should-contain [
-<span id="L1463" class="LineNr">1463 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1464" class="LineNr">1464 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1463" class="LineNr">1463 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1464" class="LineNr">1464 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1465" class="LineNr">1465 </span>  ]
 <span id="L1466" class="LineNr">1466 </span>  <span class="Comment"># undo again</span>
 <span id="L1467" class="LineNr">1467 </span>  assume-console [
-<span id="L1468" class="LineNr">1468 </span>    press ctrl-z
+<span id="L1468" class="LineNr">1468 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1469" class="LineNr">1469 </span>  ]
 <span id="L1470" class="LineNr">1470 </span>  run [
-<span id="L1471" class="LineNr">1471 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1472" class="LineNr">1472 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1473" class="LineNr">1473 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1471" class="LineNr">1471 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1472" class="LineNr">1472 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1473" class="LineNr">1473 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1474" class="LineNr">1474 </span>  ]
 <span id="L1475" class="LineNr">1475 </span>  <span class="Comment"># screen empty</span>
 <span id="L1476" class="LineNr">1476 </span>  screen-should-contain [
-<span id="L1477" class="LineNr">1477 </span>   <span class="Constant"> .          .</span>
-<span id="L1478" class="LineNr">1478 </span>   <span class="Constant"> .          .</span>
-<span id="L1479" class="LineNr">1479 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1480" class="LineNr">1480 </span>   <span class="Constant"> .          .</span>
+<span id="L1477" class="LineNr">1477 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1478" class="LineNr">1478 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1479" class="LineNr">1479 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1480" class="LineNr">1480 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1481" class="LineNr">1481 </span>  ]
 <span id="L1482" class="LineNr">1482 </span>  memory-should-contain [
-<span id="L1483" class="LineNr">1483 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1484" class="LineNr">1484 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L1483" class="LineNr">1483 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1484" class="LineNr">1484 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L1485" class="LineNr">1485 </span>  ]
 <span id="L1486" class="LineNr">1486 </span>  <span class="Comment"># redo</span>
 <span id="L1487" class="LineNr">1487 </span>  assume-console [
-<span id="L1488" class="LineNr">1488 </span>    press ctrl-y
+<span id="L1488" class="LineNr">1488 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1489" class="LineNr">1489 </span>  ]
 <span id="L1490" class="LineNr">1490 </span>  run [
-<span id="L1491" class="LineNr">1491 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1492" class="LineNr">1492 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1493" class="LineNr">1493 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1491" class="LineNr">1491 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1492" class="LineNr">1492 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1493" class="LineNr">1493 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1494" class="LineNr">1494 </span>  ]
 <span id="L1495" class="LineNr">1495 </span>  <span class="Comment"># first insert</span>
 <span id="L1496" class="LineNr">1496 </span>  screen-should-contain [
-<span id="L1497" class="LineNr">1497 </span>   <span class="Constant"> .          .</span>
-<span id="L1498" class="LineNr">1498 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1499" class="LineNr">1499 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1500" class="LineNr">1500 </span>   <span class="Constant"> .          .</span>
+<span id="L1497" class="LineNr">1497 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1498" class="LineNr">1498 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1499" class="LineNr">1499 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1500" class="LineNr">1500 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1501" class="LineNr">1501 </span>  ]
 <span id="L1502" class="LineNr">1502 </span>  memory-should-contain [
-<span id="L1503" class="LineNr">1503 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1504" class="LineNr">1504 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1503" class="LineNr">1503 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1504" class="LineNr">1504 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1505" class="LineNr">1505 </span>  ]
 <span id="L1506" class="LineNr">1506 </span>  <span class="Comment"># redo again</span>
 <span id="L1507" class="LineNr">1507 </span>  assume-console [
-<span id="L1508" class="LineNr">1508 </span>    press ctrl-y
+<span id="L1508" class="LineNr">1508 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1509" class="LineNr">1509 </span>  ]
 <span id="L1510" class="LineNr">1510 </span>  run [
-<span id="L1511" class="LineNr">1511 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1512" class="LineNr">1512 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1513" class="LineNr">1513 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1511" class="LineNr">1511 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1512" class="LineNr">1512 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1513" class="LineNr">1513 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1514" class="LineNr">1514 </span>  ]
 <span id="L1515" class="LineNr">1515 </span>  <span class="Comment"># cursor moves</span>
 <span id="L1516" class="LineNr">1516 </span>  screen-should-contain [
-<span id="L1517" class="LineNr">1517 </span>   <span class="Constant"> .          .</span>
-<span id="L1518" class="LineNr">1518 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1519" class="LineNr">1519 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1520" class="LineNr">1520 </span>   <span class="Constant"> .          .</span>
+<span id="L1517" class="LineNr">1517 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1518" class="LineNr">1518 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1519" class="LineNr">1519 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1520" class="LineNr">1520 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1521" class="LineNr">1521 </span>  ]
 <span id="L1522" class="LineNr">1522 </span>  <span class="Comment"># cursor moves</span>
 <span id="L1523" class="LineNr">1523 </span>  memory-should-contain [
-<span id="L1524" class="LineNr">1524 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1525" class="LineNr">1525 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1524" class="LineNr">1524 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1525" class="LineNr">1525 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1526" class="LineNr">1526 </span>  ]
 <span id="L1527" class="LineNr">1527 </span>  <span class="Comment"># redo again</span>
 <span id="L1528" class="LineNr">1528 </span>  assume-console [
-<span id="L1529" class="LineNr">1529 </span>    press ctrl-y
+<span id="L1529" class="LineNr">1529 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1530" class="LineNr">1530 </span>  ]
 <span id="L1531" class="LineNr">1531 </span>  run [
-<span id="L1532" class="LineNr">1532 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
-<span id="L1533" class="LineNr">1533 </span>    3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
-<span id="L1534" class="LineNr">1534 </span>    4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
+<span id="L1532" class="LineNr">1532 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1533" class="LineNr">1533 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
+<span id="L1534" class="LineNr">1534 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1535" class="LineNr">1535 </span>  ]
 <span id="L1536" class="LineNr">1536 </span>  <span class="Comment"># second insert</span>
 <span id="L1537" class="LineNr">1537 </span>  screen-should-contain [
-<span id="L1538" class="LineNr">1538 </span>   <span class="Constant"> .          .</span>
-<span id="L1539" class="LineNr">1539 </span>   <span class="Constant"> .adbc      .</span>
-<span id="L1540" class="LineNr">1540 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1541" class="LineNr">1541 </span>   <span class="Constant"> .          .</span>
+<span id="L1538" class="LineNr">1538 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1539" class="LineNr">1539 </span>  <span class="Conceal">¦</span><span class="Constant"> .adbc      .</span>
+<span id="L1540" class="LineNr">1540 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1541" class="LineNr">1541 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1542" class="LineNr">1542 </span>  ]
 <span id="L1543" class="LineNr">1543 </span>  memory-should-contain [
-<span id="L1544" class="LineNr">1544 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1545" class="LineNr">1545 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1544" class="LineNr">1544 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1545" class="LineNr">1545 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L1546" class="LineNr">1546 </span>  ]
 <span id="L1547" class="LineNr">1547 </span>]
 <span id="L1548" class="LineNr">1548 </span>
@@ -1617,60 +1618,60 @@ if ('onhashchange' in window) {
 <span id="L1556" class="LineNr">1556 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1557" class="LineNr">1557 </span>  <span class="Comment"># insert some text and hit backspace</span>
 <span id="L1558" class="LineNr">1558 </span>  assume-console [
-<span id="L1559" class="LineNr">1559 </span>    type <span class="Constant">[abc]</span>
-<span id="L1560" class="LineNr">1560 </span>    press backspace
-<span id="L1561" class="LineNr">1561 </span>    press backspace
+<span id="L1559" class="LineNr">1559 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abc]</span>
+<span id="L1560" class="LineNr">1560 </span>  <span class="Conceal">¦</span> press backspace
+<span id="L1561" class="LineNr">1561 </span>  <span class="Conceal">¦</span> press backspace
 <span id="L1562" class="LineNr">1562 </span>  ]
 <span id="L1563" class="LineNr">1563 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1564" class="LineNr">1564 </span>  screen-should-contain [
-<span id="L1565" class="LineNr">1565 </span>   <span class="Constant"> .          .</span>
-<span id="L1566" class="LineNr">1566 </span>   <span class="Constant"> .a         .</span>
-<span id="L1567" class="LineNr">1567 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1568" class="LineNr">1568 </span>   <span class="Constant"> .          .</span>
+<span id="L1565" class="LineNr">1565 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1566" class="LineNr">1566 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L1567" class="LineNr">1567 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1568" class="LineNr">1568 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1569" class="LineNr">1569 </span>  ]
 <span id="L1570" class="LineNr">1570 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1571" class="LineNr">1571 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1572" class="LineNr">1572 </span>  memory-should-contain [
-<span id="L1573" class="LineNr">1573 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1574" class="LineNr">1574 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1573" class="LineNr">1573 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1574" class="LineNr">1574 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1575" class="LineNr">1575 </span>  ]
 <span id="L1576" class="LineNr">1576 </span>  <span class="Comment"># undo</span>
 <span id="L1577" class="LineNr">1577 </span>  assume-console [
-<span id="L1578" class="LineNr">1578 </span>    press ctrl-z
+<span id="L1578" class="LineNr">1578 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1579" class="LineNr">1579 </span>  ]
 <span id="L1580" class="LineNr">1580 </span>  run [
-<span id="L1581" class="LineNr">1581 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1581" class="LineNr">1581 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1582" class="LineNr">1582 </span>  ]
 <span id="L1583" class="LineNr">1583 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1584" class="LineNr">1584 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1585" class="LineNr">1585 </span>  memory-should-contain [
-<span id="L1586" class="LineNr">1586 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1587" class="LineNr">1587 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
+<span id="L1586" class="LineNr">1586 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1587" class="LineNr">1587 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 3</span>
 <span id="L1588" class="LineNr">1588 </span>  ]
 <span id="L1589" class="LineNr">1589 </span>  screen-should-contain [
-<span id="L1590" class="LineNr">1590 </span>   <span class="Constant"> .          .</span>
-<span id="L1591" class="LineNr">1591 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1592" class="LineNr">1592 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1593" class="LineNr">1593 </span>   <span class="Constant"> .          .</span>
+<span id="L1590" class="LineNr">1590 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1591" class="LineNr">1591 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1592" class="LineNr">1592 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1593" class="LineNr">1593 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1594" class="LineNr">1594 </span>  ]
 <span id="L1595" class="LineNr">1595 </span>  <span class="Comment"># redo</span>
 <span id="L1596" class="LineNr">1596 </span>  assume-console [
-<span id="L1597" class="LineNr">1597 </span>    press ctrl-y
+<span id="L1597" class="LineNr">1597 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1598" class="LineNr">1598 </span>  ]
 <span id="L1599" class="LineNr">1599 </span>  run [
-<span id="L1600" class="LineNr">1600 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1600" class="LineNr">1600 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1601" class="LineNr">1601 </span>  ]
 <span id="L1602" class="LineNr">1602 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1603" class="LineNr">1603 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1604" class="LineNr">1604 </span>  memory-should-contain [
-<span id="L1605" class="LineNr">1605 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1606" class="LineNr">1606 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1605" class="LineNr">1605 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1606" class="LineNr">1606 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1607" class="LineNr">1607 </span>  ]
 <span id="L1608" class="LineNr">1608 </span>  screen-should-contain [
-<span id="L1609" class="LineNr">1609 </span>   <span class="Constant"> .          .</span>
-<span id="L1610" class="LineNr">1610 </span>   <span class="Constant"> .a         .</span>
-<span id="L1611" class="LineNr">1611 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1612" class="LineNr">1612 </span>   <span class="Constant"> .          .</span>
+<span id="L1609" class="LineNr">1609 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1610" class="LineNr">1610 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L1611" class="LineNr">1611 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1612" class="LineNr">1612 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1613" class="LineNr">1613 </span>  ]
 <span id="L1614" class="LineNr">1614 </span>]
 <span id="L1615" class="LineNr">1615 </span>
@@ -1680,75 +1681,75 @@ if ('onhashchange' in window) {
 <span id="L1619" class="LineNr">1619 </span>]
 <span id="L1620" class="LineNr">1620 </span><span class="muRecipe">before</span> <span class="Constant"><a href='003-shortcuts.mu.html#L75'>&lt;backspace-character-end&gt;</a></span> [
 <span id="L1621" class="LineNr">1621 </span>  <span class="Delimiter">{</span>
-<span id="L1622" class="LineNr">1622 </span>    <span class="muControl">break-unless</span> backspaced-cell  <span class="Comment"># backspace failed; don't add an undo operation</span>
-<span id="L1623" class="LineNr">1623 </span>    top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L1624" class="LineNr">1624 </span>    cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
-<span id="L1625" class="LineNr">1625 </span>    cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
-<span id="L1626" class="LineNr">1626 </span>    before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
-<span id="L1627" class="LineNr">1627 </span>    undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
-<span id="L1628" class="LineNr">1628 </span>    <span class="Delimiter">{</span>
-<span id="L1629" class="LineNr">1629 </span>      <span class="Comment"># if previous operation was an insert, coalesce this operation with it</span>
-<span id="L1630" class="LineNr">1630 </span>      <span class="muControl">break-unless</span> undo
-<span id="L1631" class="LineNr">1631 </span>      op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
-<span id="L1632" class="LineNr">1632 </span>      deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
-<span id="L1633" class="LineNr">1633 </span>      <span class="muControl">break-unless</span> is-delete?
-<span id="L1634" class="LineNr">1634 </span>      previous-coalesce-tag:num <span class="Special">&lt;-</span> get deletion, <span class="Constant">tag:offset</span>
-<span id="L1635" class="LineNr">1635 </span>      coalesce?:bool <span class="Special">&lt;-</span> equal previous-coalesce-tag, <span class="Constant">1/coalesce-backspace</span>
-<span id="L1636" class="LineNr">1636 </span>      <span class="muControl">break-unless</span> coalesce?
-<span id="L1637" class="LineNr">1637 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">delete-from:offset</span>, before-cursor
-<span id="L1638" class="LineNr">1638 </span>      backspaced-so-far:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
-<span id="L1639" class="LineNr">1639 </span>      <a href='../065duplex_list.mu.html#L485'>insert-range</a> backspaced-cell, backspaced-so-far
-<span id="L1640" class="LineNr">1640 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">deleted-text:offset</span>, backspaced-cell
-<span id="L1641" class="LineNr">1641 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-row:offset</span>, cursor-row
-<span id="L1642" class="LineNr">1642 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-column:offset</span>, cursor-column
-<span id="L1643" class="LineNr">1643 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-top-of-screen:offset</span>, top-after
-<span id="L1644" class="LineNr">1644 </span>      *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, deletion
-<span id="L1645" class="LineNr">1645 </span>      <span class="muControl">break</span> <span class="Constant">+done-adding-backspace-operation</span>
-<span id="L1646" class="LineNr">1646 </span>    <span class="Delimiter">}</span>
-<span id="L1647" class="LineNr">1647 </span>    <span class="Comment"># if not, create a new operation</span>
-<span id="L1648" class="LineNr">1648 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
-<span id="L1649" class="LineNr">1649 </span>    deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L1650" class="LineNr">1650 </span>    *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, backspaced-cell/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">1/coalesce-backspace</span>
-<span id="L1651" class="LineNr">1651 </span>    editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
-<span id="L1652" class="LineNr">1652 </span><span class="Constant">    +done-adding-backspace-operation</span>
+<span id="L1622" class="LineNr">1622 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> backspaced-cell  <span class="Comment"># backspace failed; don't add an undo operation</span>
+<span id="L1623" class="LineNr">1623 </span>  <span class="Conceal">¦</span> top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L1624" class="LineNr">1624 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
+<span id="L1625" class="LineNr">1625 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
+<span id="L1626" class="LineNr">1626 </span>  <span class="Conceal">¦</span> before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
+<span id="L1627" class="LineNr">1627 </span>  <span class="Conceal">¦</span> undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
+<span id="L1628" class="LineNr">1628 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L1629" class="LineNr">1629 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if previous operation was an insert, coalesce this operation with it</span>
+<span id="L1630" class="LineNr">1630 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo
+<span id="L1631" class="LineNr">1631 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
+<span id="L1632" class="LineNr">1632 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
+<span id="L1633" class="LineNr">1633 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-delete?
+<span id="L1634" class="LineNr">1634 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> previous-coalesce-tag:num <span class="Special">&lt;-</span> get deletion, <span class="Constant">tag:offset</span>
+<span id="L1635" class="LineNr">1635 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> coalesce?:bool <span class="Special">&lt;-</span> equal previous-coalesce-tag, <span class="Constant">1/coalesce-backspace</span>
+<span id="L1636" class="LineNr">1636 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> coalesce?
+<span id="L1637" class="LineNr">1637 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">delete-from:offset</span>, before-cursor
+<span id="L1638" class="LineNr">1638 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> backspaced-so-far:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
+<span id="L1639" class="LineNr">1639 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L485'>insert-range</a> backspaced-cell, backspaced-so-far
+<span id="L1640" class="LineNr">1640 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">deleted-text:offset</span>, backspaced-cell
+<span id="L1641" class="LineNr">1641 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-row:offset</span>, cursor-row
+<span id="L1642" class="LineNr">1642 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-column:offset</span>, cursor-column
+<span id="L1643" class="LineNr">1643 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-top-of-screen:offset</span>, top-after
+<span id="L1644" class="LineNr">1644 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, deletion
+<span id="L1645" class="LineNr">1645 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break</span> <span class="Constant">+done-adding-backspace-operation</span>
+<span id="L1646" class="LineNr">1646 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L1647" class="LineNr">1647 </span>  <span class="Conceal">¦</span> <span class="Comment"># if not, create a new operation</span>
+<span id="L1648" class="LineNr">1648 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
+<span id="L1649" class="LineNr">1649 </span>  <span class="Conceal">¦</span> deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L1650" class="LineNr">1650 </span>  <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, backspaced-cell/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">1/coalesce-backspace</span>
+<span id="L1651" class="LineNr">1651 </span>  <span class="Conceal">¦</span> editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
+<span id="L1652" class="LineNr">1652 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +done-adding-backspace-operation</span>
 <span id="L1653" class="LineNr">1653 </span>  <span class="Delimiter">}</span>
 <span id="L1654" class="LineNr">1654 </span>]
 <span id="L1655" class="LineNr">1655 </span>
 <span id="L1656" class="LineNr">1656 </span><span class="muRecipe">after</span> <span class="Constant"><a href='012-editor-undo.mu.html#L76'>&lt;handle-undo&gt;</a></span> [
 <span id="L1657" class="LineNr">1657 </span>  <span class="Delimiter">{</span>
-<span id="L1658" class="LineNr">1658 </span>    deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
-<span id="L1659" class="LineNr">1659 </span>    <span class="muControl">break-unless</span> is-delete?
-<span id="L1660" class="LineNr">1660 </span>    anchor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-from:offset</span>
-<span id="L1661" class="LineNr">1661 </span>    <span class="muControl">break-unless</span> anchor
-<span id="L1662" class="LineNr">1662 </span>    deleted:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
-<span id="L1663" class="LineNr">1663 </span>    old-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L516'>last</a> deleted
-<span id="L1664" class="LineNr">1664 </span>    <a href='../065duplex_list.mu.html#L485'>insert-range</a> anchor, deleted
-<span id="L1665" class="LineNr">1665 </span>    <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
-<span id="L1666" class="LineNr">1666 </span>    before-cursor <span class="Special">&lt;-</span> copy old-cursor
-<span id="L1667" class="LineNr">1667 </span>    cursor-row <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-row:offset</span>
-<span id="L1668" class="LineNr">1668 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L1669" class="LineNr">1669 </span>    cursor-column <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-column:offset</span>
-<span id="L1670" class="LineNr">1670 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L1671" class="LineNr">1671 </span>    top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-top-of-screen:offset</span>
-<span id="L1672" class="LineNr">1672 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
+<span id="L1658" class="LineNr">1658 </span>  <span class="Conceal">¦</span> deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
+<span id="L1659" class="LineNr">1659 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-delete?
+<span id="L1660" class="LineNr">1660 </span>  <span class="Conceal">¦</span> anchor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-from:offset</span>
+<span id="L1661" class="LineNr">1661 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> anchor
+<span id="L1662" class="LineNr">1662 </span>  <span class="Conceal">¦</span> deleted:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
+<span id="L1663" class="LineNr">1663 </span>  <span class="Conceal">¦</span> old-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L516'>last</a> deleted
+<span id="L1664" class="LineNr">1664 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L485'>insert-range</a> anchor, deleted
+<span id="L1665" class="LineNr">1665 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
+<span id="L1666" class="LineNr">1666 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy old-cursor
+<span id="L1667" class="LineNr">1667 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-row:offset</span>
+<span id="L1668" class="LineNr">1668 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L1669" class="LineNr">1669 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-column:offset</span>
+<span id="L1670" class="LineNr">1670 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L1671" class="LineNr">1671 </span>  <span class="Conceal">¦</span> top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-top-of-screen:offset</span>
+<span id="L1672" class="LineNr">1672 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
 <span id="L1673" class="LineNr">1673 </span>  <span class="Delimiter">}</span>
 <span id="L1674" class="LineNr">1674 </span>]
 <span id="L1675" class="LineNr">1675 </span>
 <span id="L1676" class="LineNr">1676 </span><span class="muRecipe">after</span> <span class="Constant"><a href='012-editor-undo.mu.html#L94'>&lt;handle-redo&gt;</a></span> [
 <span id="L1677" class="LineNr">1677 </span>  <span class="Delimiter">{</span>
-<span id="L1678" class="LineNr">1678 </span>    deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
-<span id="L1679" class="LineNr">1679 </span>    <span class="muControl">break-unless</span> is-delete?
-<span id="L1680" class="LineNr">1680 </span>    start:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-from:offset</span>
-<span id="L1681" class="LineNr">1681 </span>    end:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-until:offset</span>
-<span id="L1682" class="LineNr">1682 </span>    data:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
-<span id="L1683" class="LineNr">1683 </span>    <a href='../065duplex_list.mu.html#L345'>remove-between</a> start, end
-<span id="L1684" class="LineNr">1684 </span>    <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
-<span id="L1685" class="LineNr">1685 </span>    cursor-row <span class="Special">&lt;-</span> get deletion, <span class="Constant">after-row:offset</span>
-<span id="L1686" class="LineNr">1686 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
-<span id="L1687" class="LineNr">1687 </span>    cursor-column <span class="Special">&lt;-</span> get deletion, <span class="Constant">after-column:offset</span>
-<span id="L1688" class="LineNr">1688 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
-<span id="L1689" class="LineNr">1689 </span>    top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-top-of-screen:offset</span>
-<span id="L1690" class="LineNr">1690 </span>    *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
+<span id="L1678" class="LineNr">1678 </span>  <span class="Conceal">¦</span> deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
+<span id="L1679" class="LineNr">1679 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-delete?
+<span id="L1680" class="LineNr">1680 </span>  <span class="Conceal">¦</span> start:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-from:offset</span>
+<span id="L1681" class="LineNr">1681 </span>  <span class="Conceal">¦</span> end:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">delete-until:offset</span>
+<span id="L1682" class="LineNr">1682 </span>  <span class="Conceal">¦</span> data:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
+<span id="L1683" class="LineNr">1683 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L345'>remove-between</a> start, end
+<span id="L1684" class="LineNr">1684 </span>  <span class="Conceal">¦</span> <span class="Comment"># assert cursor-row/cursor-column/top-of-screen match after-row/after-column/after-top-of-screen</span>
+<span id="L1685" class="LineNr">1685 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> get deletion, <span class="Constant">after-row:offset</span>
+<span id="L1686" class="LineNr">1686 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
+<span id="L1687" class="LineNr">1687 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> get deletion, <span class="Constant">after-column:offset</span>
+<span id="L1688" class="LineNr">1688 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
+<span id="L1689" class="LineNr">1689 </span>  <span class="Conceal">¦</span> top:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">before-top-of-screen:offset</span>
+<span id="L1690" class="LineNr">1690 </span>  <span class="Conceal">¦</span> *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">top-of-screen:offset</span>, top
 <span id="L1691" class="LineNr">1691 </span>  <span class="Delimiter">}</span>
 <span id="L1692" class="LineNr">1692 </span>]
 <span id="L1693" class="LineNr">1693 </span>
@@ -1762,142 +1763,142 @@ if ('onhashchange' in window) {
 <span id="L1701" class="LineNr">1701 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1702" class="LineNr">1702 </span>  <span class="Comment"># insert some text and hit delete and backspace a few times</span>
 <span id="L1703" class="LineNr">1703 </span>  assume-console [
-<span id="L1704" class="LineNr">1704 </span>    type <span class="Constant">[abcdef]</span>
-<span id="L1705" class="LineNr">1705 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L1706" class="LineNr">1706 </span>    press delete
-<span id="L1707" class="LineNr">1707 </span>    press backspace
-<span id="L1708" class="LineNr">1708 </span>    press delete
-<span id="L1709" class="LineNr">1709 </span>    press delete
+<span id="L1704" class="LineNr">1704 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abcdef]</span>
+<span id="L1705" class="LineNr">1705 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L1706" class="LineNr">1706 </span>  <span class="Conceal">¦</span> press delete
+<span id="L1707" class="LineNr">1707 </span>  <span class="Conceal">¦</span> press backspace
+<span id="L1708" class="LineNr">1708 </span>  <span class="Conceal">¦</span> press delete
+<span id="L1709" class="LineNr">1709 </span>  <span class="Conceal">¦</span> press delete
 <span id="L1710" class="LineNr">1710 </span>  ]
 <span id="L1711" class="LineNr">1711 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1712" class="LineNr">1712 </span>  screen-should-contain [
-<span id="L1713" class="LineNr">1713 </span>   <span class="Constant"> .          .</span>
-<span id="L1714" class="LineNr">1714 </span>   <span class="Constant"> .af        .</span>
-<span id="L1715" class="LineNr">1715 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1716" class="LineNr">1716 </span>   <span class="Constant"> .          .</span>
+<span id="L1713" class="LineNr">1713 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1714" class="LineNr">1714 </span>  <span class="Conceal">¦</span><span class="Constant"> .af        .</span>
+<span id="L1715" class="LineNr">1715 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1716" class="LineNr">1716 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1717" class="LineNr">1717 </span>  ]
 <span id="L1718" class="LineNr">1718 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1719" class="LineNr">1719 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1720" class="LineNr">1720 </span>  memory-should-contain [
-<span id="L1721" class="LineNr">1721 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1722" class="LineNr">1722 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1721" class="LineNr">1721 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1722" class="LineNr">1722 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1723" class="LineNr">1723 </span>  ]
 <span id="L1724" class="LineNr">1724 </span>  <span class="Comment"># undo deletes</span>
 <span id="L1725" class="LineNr">1725 </span>  assume-console [
-<span id="L1726" class="LineNr">1726 </span>    press ctrl-z
+<span id="L1726" class="LineNr">1726 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1727" class="LineNr">1727 </span>  ]
 <span id="L1728" class="LineNr">1728 </span>  run [
-<span id="L1729" class="LineNr">1729 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1729" class="LineNr">1729 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1730" class="LineNr">1730 </span>  ]
 <span id="L1731" class="LineNr">1731 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1732" class="LineNr">1732 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1733" class="LineNr">1733 </span>  memory-should-contain [
-<span id="L1734" class="LineNr">1734 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1735" class="LineNr">1735 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1734" class="LineNr">1734 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1735" class="LineNr">1735 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1736" class="LineNr">1736 </span>  ]
 <span id="L1737" class="LineNr">1737 </span>  screen-should-contain [
-<span id="L1738" class="LineNr">1738 </span>   <span class="Constant"> .          .</span>
-<span id="L1739" class="LineNr">1739 </span>   <span class="Constant"> .adef      .</span>
-<span id="L1740" class="LineNr">1740 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1741" class="LineNr">1741 </span>   <span class="Constant"> .          .</span>
+<span id="L1738" class="LineNr">1738 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1739" class="LineNr">1739 </span>  <span class="Conceal">¦</span><span class="Constant"> .adef      .</span>
+<span id="L1740" class="LineNr">1740 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1741" class="LineNr">1741 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1742" class="LineNr">1742 </span>  ]
 <span id="L1743" class="LineNr">1743 </span>  <span class="Comment"># undo backspace</span>
 <span id="L1744" class="LineNr">1744 </span>  assume-console [
-<span id="L1745" class="LineNr">1745 </span>    press ctrl-z
+<span id="L1745" class="LineNr">1745 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1746" class="LineNr">1746 </span>  ]
 <span id="L1747" class="LineNr">1747 </span>  run [
-<span id="L1748" class="LineNr">1748 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1748" class="LineNr">1748 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1749" class="LineNr">1749 </span>  ]
 <span id="L1750" class="LineNr">1750 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1751" class="LineNr">1751 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1752" class="LineNr">1752 </span>  memory-should-contain [
-<span id="L1753" class="LineNr">1753 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1754" class="LineNr">1754 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1753" class="LineNr">1753 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1754" class="LineNr">1754 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L1755" class="LineNr">1755 </span>  ]
 <span id="L1756" class="LineNr">1756 </span>  screen-should-contain [
-<span id="L1757" class="LineNr">1757 </span>   <span class="Constant"> .          .</span>
-<span id="L1758" class="LineNr">1758 </span>   <span class="Constant"> .abdef     .</span>
-<span id="L1759" class="LineNr">1759 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1760" class="LineNr">1760 </span>   <span class="Constant"> .          .</span>
+<span id="L1757" class="LineNr">1757 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1758" class="LineNr">1758 </span>  <span class="Conceal">¦</span><span class="Constant"> .abdef     .</span>
+<span id="L1759" class="LineNr">1759 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1760" class="LineNr">1760 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1761" class="LineNr">1761 </span>  ]
 <span id="L1762" class="LineNr">1762 </span>  <span class="Comment"># undo first delete</span>
 <span id="L1763" class="LineNr">1763 </span>  assume-console [
-<span id="L1764" class="LineNr">1764 </span>    press ctrl-z
+<span id="L1764" class="LineNr">1764 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1765" class="LineNr">1765 </span>  ]
 <span id="L1766" class="LineNr">1766 </span>  run [
-<span id="L1767" class="LineNr">1767 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1767" class="LineNr">1767 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1768" class="LineNr">1768 </span>  ]
 <span id="L1769" class="LineNr">1769 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1770" class="LineNr">1770 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1771" class="LineNr">1771 </span>  memory-should-contain [
-<span id="L1772" class="LineNr">1772 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1773" class="LineNr">1773 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1772" class="LineNr">1772 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1773" class="LineNr">1773 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L1774" class="LineNr">1774 </span>  ]
 <span id="L1775" class="LineNr">1775 </span>  screen-should-contain [
-<span id="L1776" class="LineNr">1776 </span>   <span class="Constant"> .          .</span>
-<span id="L1777" class="LineNr">1777 </span>   <span class="Constant"> .abcdef    .</span>
-<span id="L1778" class="LineNr">1778 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1779" class="LineNr">1779 </span>   <span class="Constant"> .          .</span>
+<span id="L1776" class="LineNr">1776 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1777" class="LineNr">1777 </span>  <span class="Conceal">¦</span><span class="Constant"> .abcdef    .</span>
+<span id="L1778" class="LineNr">1778 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1779" class="LineNr">1779 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1780" class="LineNr">1780 </span>  ]
 <span id="L1781" class="LineNr">1781 </span>  <span class="Comment"># redo first delete</span>
 <span id="L1782" class="LineNr">1782 </span>  assume-console [
-<span id="L1783" class="LineNr">1783 </span>    press ctrl-y
+<span id="L1783" class="LineNr">1783 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1784" class="LineNr">1784 </span>  ]
 <span id="L1785" class="LineNr">1785 </span>  run [
-<span id="L1786" class="LineNr">1786 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1786" class="LineNr">1786 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1787" class="LineNr">1787 </span>  ]
 <span id="L1788" class="LineNr">1788 </span>  <span class="Comment"># first line inserted</span>
 <span id="L1789" class="LineNr">1789 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1790" class="LineNr">1790 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1791" class="LineNr">1791 </span>  memory-should-contain [
-<span id="L1792" class="LineNr">1792 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1793" class="LineNr">1793 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L1792" class="LineNr">1792 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1793" class="LineNr">1793 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L1794" class="LineNr">1794 </span>  ]
 <span id="L1795" class="LineNr">1795 </span>  screen-should-contain [
-<span id="L1796" class="LineNr">1796 </span>   <span class="Constant"> .          .</span>
-<span id="L1797" class="LineNr">1797 </span>   <span class="Constant"> .abdef     .</span>
-<span id="L1798" class="LineNr">1798 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1799" class="LineNr">1799 </span>   <span class="Constant"> .          .</span>
+<span id="L1796" class="LineNr">1796 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1797" class="LineNr">1797 </span>  <span class="Conceal">¦</span><span class="Constant"> .abdef     .</span>
+<span id="L1798" class="LineNr">1798 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1799" class="LineNr">1799 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1800" class="LineNr">1800 </span>  ]
 <span id="L1801" class="LineNr">1801 </span>  <span class="Comment"># redo backspace</span>
 <span id="L1802" class="LineNr">1802 </span>  assume-console [
-<span id="L1803" class="LineNr">1803 </span>    press ctrl-y
+<span id="L1803" class="LineNr">1803 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1804" class="LineNr">1804 </span>  ]
 <span id="L1805" class="LineNr">1805 </span>  run [
-<span id="L1806" class="LineNr">1806 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1806" class="LineNr">1806 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1807" class="LineNr">1807 </span>  ]
 <span id="L1808" class="LineNr">1808 </span>  <span class="Comment"># first line inserted</span>
 <span id="L1809" class="LineNr">1809 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1810" class="LineNr">1810 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1811" class="LineNr">1811 </span>  memory-should-contain [
-<span id="L1812" class="LineNr">1812 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1813" class="LineNr">1813 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1812" class="LineNr">1812 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1813" class="LineNr">1813 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1814" class="LineNr">1814 </span>  ]
 <span id="L1815" class="LineNr">1815 </span>  screen-should-contain [
-<span id="L1816" class="LineNr">1816 </span>   <span class="Constant"> .          .</span>
-<span id="L1817" class="LineNr">1817 </span>   <span class="Constant"> .adef      .</span>
-<span id="L1818" class="LineNr">1818 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1819" class="LineNr">1819 </span>   <span class="Constant"> .          .</span>
+<span id="L1816" class="LineNr">1816 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1817" class="LineNr">1817 </span>  <span class="Conceal">¦</span><span class="Constant"> .adef      .</span>
+<span id="L1818" class="LineNr">1818 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1819" class="LineNr">1819 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1820" class="LineNr">1820 </span>  ]
 <span id="L1821" class="LineNr">1821 </span>  <span class="Comment"># redo deletes</span>
 <span id="L1822" class="LineNr">1822 </span>  assume-console [
-<span id="L1823" class="LineNr">1823 </span>    press ctrl-y
+<span id="L1823" class="LineNr">1823 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1824" class="LineNr">1824 </span>  ]
 <span id="L1825" class="LineNr">1825 </span>  run [
-<span id="L1826" class="LineNr">1826 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1826" class="LineNr">1826 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1827" class="LineNr">1827 </span>  ]
 <span id="L1828" class="LineNr">1828 </span>  <span class="Comment"># first line inserted</span>
 <span id="L1829" class="LineNr">1829 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1830" class="LineNr">1830 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1831" class="LineNr">1831 </span>  memory-should-contain [
-<span id="L1832" class="LineNr">1832 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1833" class="LineNr">1833 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1832" class="LineNr">1832 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1833" class="LineNr">1833 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1834" class="LineNr">1834 </span>  ]
 <span id="L1835" class="LineNr">1835 </span>  screen-should-contain [
-<span id="L1836" class="LineNr">1836 </span>   <span class="Constant"> .          .</span>
-<span id="L1837" class="LineNr">1837 </span>   <span class="Constant"> .af        .</span>
-<span id="L1838" class="LineNr">1838 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1839" class="LineNr">1839 </span>   <span class="Constant"> .          .</span>
+<span id="L1836" class="LineNr">1836 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1837" class="LineNr">1837 </span>  <span class="Conceal">¦</span><span class="Constant"> .af        .</span>
+<span id="L1838" class="LineNr">1838 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1839" class="LineNr">1839 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1840" class="LineNr">1840 </span>  ]
 <span id="L1841" class="LineNr">1841 </span>]
 <span id="L1842" class="LineNr">1842 </span>
@@ -1906,38 +1907,38 @@ if ('onhashchange' in window) {
 <span id="L1845" class="LineNr">1845 </span>]
 <span id="L1846" class="LineNr">1846 </span><span class="muRecipe">before</span> <span class="Constant"><a href='003-shortcuts.mu.html#L343'>&lt;delete-character-end&gt;</a></span> [
 <span id="L1847" class="LineNr">1847 </span>  <span class="Delimiter">{</span>
-<span id="L1848" class="LineNr">1848 </span>    <span class="muControl">break-unless</span> deleted-cell  <span class="Comment"># delete failed; don't add an undo operation</span>
-<span id="L1849" class="LineNr">1849 </span>    top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L1850" class="LineNr">1850 </span>    cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
-<span id="L1851" class="LineNr">1851 </span>    cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
-<span id="L1852" class="LineNr">1852 </span>    before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
-<span id="L1853" class="LineNr">1853 </span>    undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
-<span id="L1854" class="LineNr">1854 </span>    <span class="Delimiter">{</span>
-<span id="L1855" class="LineNr">1855 </span>      <span class="Comment"># if previous operation was an insert, coalesce this operation with it</span>
-<span id="L1856" class="LineNr">1856 </span>      <span class="muControl">break-unless</span> undo
-<span id="L1857" class="LineNr">1857 </span>      op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
-<span id="L1858" class="LineNr">1858 </span>      deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
-<span id="L1859" class="LineNr">1859 </span>      <span class="muControl">break-unless</span> is-delete?
-<span id="L1860" class="LineNr">1860 </span>      previous-coalesce-tag:num <span class="Special">&lt;-</span> get deletion, <span class="Constant">tag:offset</span>
-<span id="L1861" class="LineNr">1861 </span>      coalesce?:bool <span class="Special">&lt;-</span> equal previous-coalesce-tag, <span class="Constant">2/coalesce-delete</span>
-<span id="L1862" class="LineNr">1862 </span>      <span class="muControl">break-unless</span> coalesce?
-<span id="L1863" class="LineNr">1863 </span>      delete-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L1864" class="LineNr">1864 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">delete-until:offset</span>, delete-until
-<span id="L1865" class="LineNr">1865 </span>      deleted-so-far:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
-<span id="L1866" class="LineNr">1866 </span>      deleted-so-far <span class="Special">&lt;-</span> append deleted-so-far, deleted-cell
-<span id="L1867" class="LineNr">1867 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">deleted-text:offset</span>, deleted-so-far
-<span id="L1868" class="LineNr">1868 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-row:offset</span>, cursor-row
-<span id="L1869" class="LineNr">1869 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-column:offset</span>, cursor-column
-<span id="L1870" class="LineNr">1870 </span>      deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-top-of-screen:offset</span>, top-after
-<span id="L1871" class="LineNr">1871 </span>      *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, deletion
-<span id="L1872" class="LineNr">1872 </span>      <span class="muControl">break</span> <span class="Constant">+done-adding-delete-operation</span>
-<span id="L1873" class="LineNr">1873 </span>    <span class="Delimiter">}</span>
-<span id="L1874" class="LineNr">1874 </span>    <span class="Comment"># if not, create a new operation</span>
-<span id="L1875" class="LineNr">1875 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
-<span id="L1876" class="LineNr">1876 </span>    deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L1877" class="LineNr">1877 </span>    *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, deleted-cell/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">2/coalesce-delete</span>
-<span id="L1878" class="LineNr">1878 </span>    editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
-<span id="L1879" class="LineNr">1879 </span><span class="Constant">    +done-adding-delete-operation</span>
+<span id="L1848" class="LineNr">1848 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> deleted-cell  <span class="Comment"># delete failed; don't add an undo operation</span>
+<span id="L1849" class="LineNr">1849 </span>  <span class="Conceal">¦</span> top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L1850" class="LineNr">1850 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
+<span id="L1851" class="LineNr">1851 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
+<span id="L1852" class="LineNr">1852 </span>  <span class="Conceal">¦</span> before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
+<span id="L1853" class="LineNr">1853 </span>  <span class="Conceal">¦</span> undo:&amp;:list:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> get *editor, <span class="Constant">undo:offset</span>
+<span id="L1854" class="LineNr">1854 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L1855" class="LineNr">1855 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># if previous operation was an insert, coalesce this operation with it</span>
+<span id="L1856" class="LineNr">1856 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> undo
+<span id="L1857" class="LineNr">1857 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> first undo
+<span id="L1858" class="LineNr">1858 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion:<a href='012-editor-undo.mu.html#L41'>delete-operation</a>, is-delete?:bool <span class="Special">&lt;-</span> maybe-convert *op, <span class="Constant">delete:variant</span>
+<span id="L1859" class="LineNr">1859 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-delete?
+<span id="L1860" class="LineNr">1860 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> previous-coalesce-tag:num <span class="Special">&lt;-</span> get deletion, <span class="Constant">tag:offset</span>
+<span id="L1861" class="LineNr">1861 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> coalesce?:bool <span class="Special">&lt;-</span> equal previous-coalesce-tag, <span class="Constant">2/coalesce-delete</span>
+<span id="L1862" class="LineNr">1862 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> coalesce?
+<span id="L1863" class="LineNr">1863 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> delete-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L1864" class="LineNr">1864 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">delete-until:offset</span>, delete-until
+<span id="L1865" class="LineNr">1865 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deleted-so-far:&amp;:duplex-list:char <span class="Special">&lt;-</span> get deletion, <span class="Constant">deleted-text:offset</span>
+<span id="L1866" class="LineNr">1866 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deleted-so-far <span class="Special">&lt;-</span> append deleted-so-far, deleted-cell
+<span id="L1867" class="LineNr">1867 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">deleted-text:offset</span>, deleted-so-far
+<span id="L1868" class="LineNr">1868 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-row:offset</span>, cursor-row
+<span id="L1869" class="LineNr">1869 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-column:offset</span>, cursor-column
+<span id="L1870" class="LineNr">1870 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> deletion <span class="Special">&lt;-</span> put deletion, <span class="Constant">after-top-of-screen:offset</span>, top-after
+<span id="L1871" class="LineNr">1871 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, deletion
+<span id="L1872" class="LineNr">1872 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break</span> <span class="Constant">+done-adding-delete-operation</span>
+<span id="L1873" class="LineNr">1873 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L1874" class="LineNr">1874 </span>  <span class="Conceal">¦</span> <span class="Comment"># if not, create a new operation</span>
+<span id="L1875" class="LineNr">1875 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
+<span id="L1876" class="LineNr">1876 </span>  <span class="Conceal">¦</span> deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L1877" class="LineNr">1877 </span>  <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, deleted-cell/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">2/coalesce-delete</span>
+<span id="L1878" class="LineNr">1878 </span>  <span class="Conceal">¦</span> editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
+<span id="L1879" class="LineNr">1879 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +done-adding-delete-operation</span>
 <span id="L1880" class="LineNr">1880 </span>  <span class="Delimiter">}</span>
 <span id="L1881" class="LineNr">1881 </span>]
 <span id="L1882" class="LineNr">1882 </span>
@@ -1953,77 +1954,77 @@ if ('onhashchange' in window) {
 <span id="L1892" class="LineNr">1892 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1893" class="LineNr">1893 </span>  <span class="Comment"># insert some text and hit delete and backspace a few times</span>
 <span id="L1894" class="LineNr">1894 </span>  assume-console [
-<span id="L1895" class="LineNr">1895 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L1896" class="LineNr">1896 </span>    press ctrl-k
+<span id="L1895" class="LineNr">1895 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L1896" class="LineNr">1896 </span>  <span class="Conceal">¦</span> press ctrl-k
 <span id="L1897" class="LineNr">1897 </span>  ]
 <span id="L1898" class="LineNr">1898 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1899" class="LineNr">1899 </span>  screen-should-contain [
-<span id="L1900" class="LineNr">1900 </span>   <span class="Constant"> .          .</span>
-<span id="L1901" class="LineNr">1901 </span>   <span class="Constant"> .a         .</span>
-<span id="L1902" class="LineNr">1902 </span>   <span class="Constant"> .def       .</span>
-<span id="L1903" class="LineNr">1903 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1904" class="LineNr">1904 </span>   <span class="Constant"> .          .</span>
+<span id="L1900" class="LineNr">1900 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1901" class="LineNr">1901 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L1902" class="LineNr">1902 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L1903" class="LineNr">1903 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1904" class="LineNr">1904 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1905" class="LineNr">1905 </span>  ]
 <span id="L1906" class="LineNr">1906 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1907" class="LineNr">1907 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1908" class="LineNr">1908 </span>  memory-should-contain [
-<span id="L1909" class="LineNr">1909 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1910" class="LineNr">1910 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1909" class="LineNr">1909 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1910" class="LineNr">1910 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1911" class="LineNr">1911 </span>  ]
 <span id="L1912" class="LineNr">1912 </span>  <span class="Comment"># undo</span>
 <span id="L1913" class="LineNr">1913 </span>  assume-console [
-<span id="L1914" class="LineNr">1914 </span>    press ctrl-z
+<span id="L1914" class="LineNr">1914 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L1915" class="LineNr">1915 </span>  ]
 <span id="L1916" class="LineNr">1916 </span>  run [
-<span id="L1917" class="LineNr">1917 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1917" class="LineNr">1917 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1918" class="LineNr">1918 </span>  ]
 <span id="L1919" class="LineNr">1919 </span>  screen-should-contain [
-<span id="L1920" class="LineNr">1920 </span>   <span class="Constant"> .          .</span>
-<span id="L1921" class="LineNr">1921 </span>   <span class="Constant"> .abc       .</span>
-<span id="L1922" class="LineNr">1922 </span>   <span class="Constant"> .def       .</span>
-<span id="L1923" class="LineNr">1923 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1924" class="LineNr">1924 </span>   <span class="Constant"> .          .</span>
+<span id="L1920" class="LineNr">1920 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1921" class="LineNr">1921 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L1922" class="LineNr">1922 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L1923" class="LineNr">1923 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1924" class="LineNr">1924 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1925" class="LineNr">1925 </span>  ]
 <span id="L1926" class="LineNr">1926 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1927" class="LineNr">1927 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1928" class="LineNr">1928 </span>  memory-should-contain [
-<span id="L1929" class="LineNr">1929 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1930" class="LineNr">1930 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1929" class="LineNr">1929 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1930" class="LineNr">1930 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1931" class="LineNr">1931 </span>  ]
 <span id="L1932" class="LineNr">1932 </span>  <span class="Comment"># redo</span>
 <span id="L1933" class="LineNr">1933 </span>  assume-console [
-<span id="L1934" class="LineNr">1934 </span>    press ctrl-y
+<span id="L1934" class="LineNr">1934 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L1935" class="LineNr">1935 </span>  ]
 <span id="L1936" class="LineNr">1936 </span>  run [
-<span id="L1937" class="LineNr">1937 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1937" class="LineNr">1937 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1938" class="LineNr">1938 </span>  ]
 <span id="L1939" class="LineNr">1939 </span>  <span class="Comment"># first line inserted</span>
 <span id="L1940" class="LineNr">1940 </span>  screen-should-contain [
-<span id="L1941" class="LineNr">1941 </span>   <span class="Constant"> .          .</span>
-<span id="L1942" class="LineNr">1942 </span>   <span class="Constant"> .a         .</span>
-<span id="L1943" class="LineNr">1943 </span>   <span class="Constant"> .def       .</span>
-<span id="L1944" class="LineNr">1944 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1945" class="LineNr">1945 </span>   <span class="Constant"> .          .</span>
+<span id="L1941" class="LineNr">1941 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1942" class="LineNr">1942 </span>  <span class="Conceal">¦</span><span class="Constant"> .a         .</span>
+<span id="L1943" class="LineNr">1943 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L1944" class="LineNr">1944 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1945" class="LineNr">1945 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1946" class="LineNr">1946 </span>  ]
 <span id="L1947" class="LineNr">1947 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L1948" class="LineNr">1948 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L1949" class="LineNr">1949 </span>  memory-should-contain [
-<span id="L1950" class="LineNr">1950 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L1951" class="LineNr">1951 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1950" class="LineNr">1950 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L1951" class="LineNr">1951 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
 <span id="L1952" class="LineNr">1952 </span>  ]
 <span id="L1953" class="LineNr">1953 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L1954" class="LineNr">1954 </span>  assume-console [
-<span id="L1955" class="LineNr">1955 </span>    type <span class="Constant">[1]</span>
+<span id="L1955" class="LineNr">1955 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L1956" class="LineNr">1956 </span>  ]
 <span id="L1957" class="LineNr">1957 </span>  run [
-<span id="L1958" class="LineNr">1958 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L1958" class="LineNr">1958 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L1959" class="LineNr">1959 </span>  ]
 <span id="L1960" class="LineNr">1960 </span>  screen-should-contain [
-<span id="L1961" class="LineNr">1961 </span>   <span class="Constant"> .          .</span>
-<span id="L1962" class="LineNr">1962 </span>   <span class="Constant"> .a1        .</span>
-<span id="L1963" class="LineNr">1963 </span>   <span class="Constant"> .def       .</span>
-<span id="L1964" class="LineNr">1964 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L1965" class="LineNr">1965 </span>   <span class="Constant"> .          .</span>
+<span id="L1961" class="LineNr">1961 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L1962" class="LineNr">1962 </span>  <span class="Conceal">¦</span><span class="Constant"> .a1        .</span>
+<span id="L1963" class="LineNr">1963 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L1964" class="LineNr">1964 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L1965" class="LineNr">1965 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L1966" class="LineNr">1966 </span>  ]
 <span id="L1967" class="LineNr">1967 </span>]
 <span id="L1968" class="LineNr">1968 </span>
@@ -2032,15 +2033,15 @@ if ('onhashchange' in window) {
 <span id="L1971" class="LineNr">1971 </span>]
 <span id="L1972" class="LineNr">1972 </span><span class="muRecipe">before</span> <span class="Constant"><a href='003-shortcuts.mu.html#L1791'>&lt;delete-to-end-of-line-end&gt;</a></span> [
 <span id="L1973" class="LineNr">1973 </span>  <span class="Delimiter">{</span>
-<span id="L1974" class="LineNr">1974 </span>    <span class="muControl">break-unless</span> deleted-cells  <span class="Comment"># delete failed; don't add an undo operation</span>
-<span id="L1975" class="LineNr">1975 </span>    top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L1976" class="LineNr">1976 </span>    cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
-<span id="L1977" class="LineNr">1977 </span>    cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
-<span id="L1978" class="LineNr">1978 </span>    deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L1979" class="LineNr">1979 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
-<span id="L1980" class="LineNr">1980 </span>    *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, deleted-cells/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">0/never-coalesce</span>
-<span id="L1981" class="LineNr">1981 </span>    editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
-<span id="L1982" class="LineNr">1982 </span><span class="Constant">    +done-adding-delete-operation</span>
+<span id="L1974" class="LineNr">1974 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> deleted-cells  <span class="Comment"># delete failed; don't add an undo operation</span>
+<span id="L1975" class="LineNr">1975 </span>  <span class="Conceal">¦</span> top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L1976" class="LineNr">1976 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
+<span id="L1977" class="LineNr">1977 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
+<span id="L1978" class="LineNr">1978 </span>  <span class="Conceal">¦</span> deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L1979" class="LineNr">1979 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
+<span id="L1980" class="LineNr">1980 </span>  <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, deleted-cells/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">0/never-coalesce</span>
+<span id="L1981" class="LineNr">1981 </span>  <span class="Conceal">¦</span> editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
+<span id="L1982" class="LineNr">1982 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +done-adding-delete-operation</span>
 <span id="L1983" class="LineNr">1983 </span>  <span class="Delimiter">}</span>
 <span id="L1984" class="LineNr">1984 </span>]
 <span id="L1985" class="LineNr">1985 </span>
@@ -2056,77 +2057,77 @@ if ('onhashchange' in window) {
 <span id="L1995" class="LineNr">1995 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L1996" class="LineNr">1996 </span>  <span class="Comment"># insert some text and hit delete and backspace a few times</span>
 <span id="L1997" class="LineNr">1997 </span>  assume-console [
-<span id="L1998" class="LineNr">1998 </span>    left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
-<span id="L1999" class="LineNr">1999 </span>    press ctrl-u
+<span id="L1998" class="LineNr">1998 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 2</span>
+<span id="L1999" class="LineNr">1999 </span>  <span class="Conceal">¦</span> press ctrl-u
 <span id="L2000" class="LineNr">2000 </span>  ]
 <span id="L2001" class="LineNr">2001 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2002" class="LineNr">2002 </span>  screen-should-contain [
-<span id="L2003" class="LineNr">2003 </span>   <span class="Constant"> .          .</span>
-<span id="L2004" class="LineNr">2004 </span>   <span class="Constant"> .c         .</span>
-<span id="L2005" class="LineNr">2005 </span>   <span class="Constant"> .def       .</span>
-<span id="L2006" class="LineNr">2006 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2007" class="LineNr">2007 </span>   <span class="Constant"> .          .</span>
+<span id="L2003" class="LineNr">2003 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2004" class="LineNr">2004 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2005" class="LineNr">2005 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L2006" class="LineNr">2006 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2007" class="LineNr">2007 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2008" class="LineNr">2008 </span>  ]
 <span id="L2009" class="LineNr">2009 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L2010" class="LineNr">2010 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2011" class="LineNr">2011 </span>  memory-should-contain [
-<span id="L2012" class="LineNr">2012 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L2013" class="LineNr">2013 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L2012" class="LineNr">2012 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2013" class="LineNr">2013 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L2014" class="LineNr">2014 </span>  ]
 <span id="L2015" class="LineNr">2015 </span>  <span class="Comment"># undo</span>
 <span id="L2016" class="LineNr">2016 </span>  assume-console [
-<span id="L2017" class="LineNr">2017 </span>    press ctrl-z
+<span id="L2017" class="LineNr">2017 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L2018" class="LineNr">2018 </span>  ]
 <span id="L2019" class="LineNr">2019 </span>  run [
-<span id="L2020" class="LineNr">2020 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2020" class="LineNr">2020 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2021" class="LineNr">2021 </span>  ]
 <span id="L2022" class="LineNr">2022 </span>  screen-should-contain [
-<span id="L2023" class="LineNr">2023 </span>   <span class="Constant"> .          .</span>
-<span id="L2024" class="LineNr">2024 </span>   <span class="Constant"> .abc       .</span>
-<span id="L2025" class="LineNr">2025 </span>   <span class="Constant"> .def       .</span>
-<span id="L2026" class="LineNr">2026 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2027" class="LineNr">2027 </span>   <span class="Constant"> .          .</span>
+<span id="L2023" class="LineNr">2023 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2024" class="LineNr">2024 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L2025" class="LineNr">2025 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L2026" class="LineNr">2026 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2027" class="LineNr">2027 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2028" class="LineNr">2028 </span>  ]
 <span id="L2029" class="LineNr">2029 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L2030" class="LineNr">2030 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2031" class="LineNr">2031 </span>  memory-should-contain [
-<span id="L2032" class="LineNr">2032 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L2033" class="LineNr">2033 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
+<span id="L2032" class="LineNr">2032 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2033" class="LineNr">2033 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>
 <span id="L2034" class="LineNr">2034 </span>  ]
 <span id="L2035" class="LineNr">2035 </span>  <span class="Comment"># redo</span>
 <span id="L2036" class="LineNr">2036 </span>  assume-console [
-<span id="L2037" class="LineNr">2037 </span>    press ctrl-y
+<span id="L2037" class="LineNr">2037 </span>  <span class="Conceal">¦</span> press ctrl-y
 <span id="L2038" class="LineNr">2038 </span>  ]
 <span id="L2039" class="LineNr">2039 </span>  run [
-<span id="L2040" class="LineNr">2040 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2040" class="LineNr">2040 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2041" class="LineNr">2041 </span>  ]
 <span id="L2042" class="LineNr">2042 </span>  <span class="Comment"># first line inserted</span>
 <span id="L2043" class="LineNr">2043 </span>  screen-should-contain [
-<span id="L2044" class="LineNr">2044 </span>   <span class="Constant"> .          .</span>
-<span id="L2045" class="LineNr">2045 </span>   <span class="Constant"> .c         .</span>
-<span id="L2046" class="LineNr">2046 </span>   <span class="Constant"> .def       .</span>
-<span id="L2047" class="LineNr">2047 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2048" class="LineNr">2048 </span>   <span class="Constant"> .          .</span>
+<span id="L2044" class="LineNr">2044 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2045" class="LineNr">2045 </span>  <span class="Conceal">¦</span><span class="Constant"> .c         .</span>
+<span id="L2046" class="LineNr">2046 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L2047" class="LineNr">2047 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2048" class="LineNr">2048 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2049" class="LineNr">2049 </span>  ]
 <span id="L2050" class="LineNr">2050 </span>  3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
 <span id="L2051" class="LineNr">2051 </span>  4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
 <span id="L2052" class="LineNr">2052 </span>  memory-should-contain [
-<span id="L2053" class="LineNr">2053 </span>   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L2054" class="LineNr">2054 </span>   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L2053" class="LineNr">2053 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L2054" class="LineNr">2054 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L2055" class="LineNr">2055 </span>  ]
 <span id="L2056" class="LineNr">2056 </span>  <span class="Comment"># cursor should be in the right place</span>
 <span id="L2057" class="LineNr">2057 </span>  assume-console [
-<span id="L2058" class="LineNr">2058 </span>    type <span class="Constant">[1]</span>
+<span id="L2058" class="LineNr">2058 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
 <span id="L2059" class="LineNr">2059 </span>  ]
 <span id="L2060" class="LineNr">2060 </span>  run [
-<span id="L2061" class="LineNr">2061 </span>    <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
+<span id="L2061" class="LineNr">2061 </span>  <span class="Conceal">¦</span> <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2062" class="LineNr">2062 </span>  ]
 <span id="L2063" class="LineNr">2063 </span>  screen-should-contain [
-<span id="L2064" class="LineNr">2064 </span>   <span class="Constant"> .          .</span>
-<span id="L2065" class="LineNr">2065 </span>   <span class="Constant"> .1c        .</span>
-<span id="L2066" class="LineNr">2066 </span>   <span class="Constant"> .def       .</span>
-<span id="L2067" class="LineNr">2067 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2068" class="LineNr">2068 </span>   <span class="Constant"> .          .</span>
+<span id="L2064" class="LineNr">2064 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2065" class="LineNr">2065 </span>  <span class="Conceal">¦</span><span class="Constant"> .1c        .</span>
+<span id="L2066" class="LineNr">2066 </span>  <span class="Conceal">¦</span><span class="Constant"> .def       .</span>
+<span id="L2067" class="LineNr">2067 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2068" class="LineNr">2068 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2069" class="LineNr">2069 </span>  ]
 <span id="L2070" class="LineNr">2070 </span>]
 <span id="L2071" class="LineNr">2071 </span>
@@ -2135,16 +2136,16 @@ if ('onhashchange' in window) {
 <span id="L2074" class="LineNr">2074 </span>]
 <span id="L2075" class="LineNr">2075 </span><span class="muRecipe">before</span> <span class="Constant"><a href='003-shortcuts.mu.html#L1654'>&lt;delete-to-start-of-line-end&gt;</a></span> [
 <span id="L2076" class="LineNr">2076 </span>  <span class="Delimiter">{</span>
-<span id="L2077" class="LineNr">2077 </span>    <span class="muControl">break-unless</span> deleted-cells  <span class="Comment"># delete failed; don't add an undo operation</span>
-<span id="L2078" class="LineNr">2078 </span>    top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L2079" class="LineNr">2079 </span>    op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
-<span id="L2080" class="LineNr">2080 </span>    before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
-<span id="L2081" class="LineNr">2081 </span>    deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
-<span id="L2082" class="LineNr">2082 </span>    cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
-<span id="L2083" class="LineNr">2083 </span>    cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
-<span id="L2084" class="LineNr">2084 </span>    *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, deleted-cells/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">0/never-coalesce</span>
-<span id="L2085" class="LineNr">2085 </span>    editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
-<span id="L2086" class="LineNr">2086 </span><span class="Constant">    +done-adding-delete-operation</span>
+<span id="L2077" class="LineNr">2077 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> deleted-cells  <span class="Comment"># delete failed; don't add an undo operation</span>
+<span id="L2078" class="LineNr">2078 </span>  <span class="Conceal">¦</span> top-after:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L2079" class="LineNr">2079 </span>  <span class="Conceal">¦</span> op:&amp;:<a href='012-editor-undo.mu.html#L5'>operation</a> <span class="Special">&lt;-</span> new <span class="Constant"><a href='012-editor-undo.mu.html#L5'>operation</a>:type</span>
+<span id="L2080" class="LineNr">2080 </span>  <span class="Conceal">¦</span> before-cursor:&amp;:duplex-list:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
+<span id="L2081" class="LineNr">2081 </span>  <span class="Conceal">¦</span> deleted-until:&amp;:duplex-list:char <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> before-cursor
+<span id="L2082" class="LineNr">2082 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
+<span id="L2083" class="LineNr">2083 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
+<span id="L2084" class="LineNr">2084 </span>  <span class="Conceal">¦</span> *op <span class="Special">&lt;-</span> merge <span class="Constant">2/delete-operation</span>, save-row/before, save-column/before, top-before, cursor-row/after, cursor-column/after, top-after, deleted-cells/deleted, before-cursor/delete-from, deleted-until, <span class="Constant">0/never-coalesce</span>
+<span id="L2085" class="LineNr">2085 </span>  <span class="Conceal">¦</span> editor <span class="Special">&lt;-</span> <a href='012-editor-undo.mu.html#L200'>add-operation</a> editor, op
+<span id="L2086" class="LineNr">2086 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +done-adding-delete-operation</span>
 <span id="L2087" class="LineNr">2087 </span>  <span class="Delimiter">}</span>
 <span id="L2088" class="LineNr">2088 </span>]
 <span id="L2089" class="LineNr">2089 </span>
@@ -2156,16 +2157,16 @@ if ('onhashchange' in window) {
 <span id="L2095" class="LineNr">2095 </span>  <a href='002-typing.mu.html#L263'>editor-render</a> <a href='../081print.mu.html#L4'>screen</a>, e
 <span id="L2096" class="LineNr">2096 </span>  <span class="Comment"># insert some text and hit delete and backspace a few times</span>
 <span id="L2097" class="LineNr">2097 </span>  assume-console [
-<span id="L2098" class="LineNr">2098 </span>    type <span class="Constant">[abc]</span>
-<span id="L2099" class="LineNr">2099 </span>    press ctrl-u
-<span id="L2100" class="LineNr">2100 </span>    press ctrl-z
+<span id="L2098" class="LineNr">2098 </span>  <span class="Conceal">¦</span> type <span class="Constant">[abc]</span>
+<span id="L2099" class="LineNr">2099 </span>  <span class="Conceal">¦</span> press ctrl-u
+<span id="L2100" class="LineNr">2100 </span>  <span class="Conceal">¦</span> press ctrl-z
 <span id="L2101" class="LineNr">2101 </span>  ]
 <span id="L2102" class="LineNr">2102 </span>  <a href='002-typing.mu.html#L14'>editor-event-loop</a> <a href='../081print.mu.html#L4'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, e
 <span id="L2103" class="LineNr">2103 </span>  screen-should-contain [
-<span id="L2104" class="LineNr">2104 </span>   <span class="Constant"> .          .</span>
-<span id="L2105" class="LineNr">2105 </span>   <span class="Constant"> .abc       .</span>
-<span id="L2106" class="LineNr">2106 </span><span class="Constant">    .╌╌╌╌╌╌╌╌╌╌.</span>
-<span id="L2107" class="LineNr">2107 </span>   <span class="Constant"> .          .</span>
+<span id="L2104" class="LineNr">2104 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
+<span id="L2105" class="LineNr">2105 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
+<span id="L2106" class="LineNr">2106 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌.</span>
+<span id="L2107" class="LineNr">2107 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
 <span id="L2108" class="LineNr">2108 </span>  ]
 <span id="L2109" class="LineNr">2109 </span>]
 </pre>
diff --git a/html/example1.mu.html b/html/example1.mu.html
index 61462817..518f3e79 100644
--- a/html/example1.mu.html
+++ b/html/example1.mu.html
@@ -15,10 +15,10 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/factorial.mu.html b/html/factorial.mu.html
index 1133ccfe..04253954 100644
--- a/html/factorial.mu.html
+++ b/html/factorial.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
+.Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -70,10 +71,10 @@ if ('onhashchange' in window) {
 <span id="L11" class="LineNr">11 </span>  <span class="Constant">local-scope</span>
 <span id="L12" class="LineNr">12 </span>  <span class="Constant">load-ingredients</span>
 <span id="L13" class="LineNr">13 </span>  <span class="Delimiter">{</span>
-<span id="L14" class="LineNr">14 </span>    <span class="Comment"># if n=0 return 1</span>
-<span id="L15" class="LineNr">15 </span>    zero?:bool <span class="Special">&lt;-</span> equal n,<span class="Constant"> 0</span>
-<span id="L16" class="LineNr">16 </span>    <span class="muControl">break-unless</span> zero?
-<span id="L17" class="LineNr">17 </span>    <span class="muControl">return</span><span class="Constant"> 1</span>
+<span id="L14" class="LineNr">14 </span>  <span class="Conceal">¦</span> <span class="Comment"># if n=0 return 1</span>
+<span id="L15" class="LineNr">15 </span>  <span class="Conceal">¦</span> zero?:bool <span class="Special">&lt;-</span> equal n,<span class="Constant"> 0</span>
+<span id="L16" class="LineNr">16 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> zero?
+<span id="L17" class="LineNr">17 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span><span class="Constant"> 1</span>
 <span id="L18" class="LineNr">18 </span>  <span class="Delimiter">}</span>
 <span id="L19" class="LineNr">19 </span>  <span class="Comment"># return n * factorial(n-1)</span>
 <span id="L20" class="LineNr">20 </span>  x:num <span class="Special">&lt;-</span> subtract n,<span class="Constant"> 1</span>
@@ -84,10 +85,10 @@ if ('onhashchange' in window) {
 <span id="L25" class="LineNr">25 </span><span class="Comment"># unit test</span>
 <span id="L26" class="LineNr">26 </span><span class="muScenario">scenario</span> factorial-test [
 <span id="L27" class="LineNr">27 </span>  run [
-<span id="L28" class="LineNr">28 </span>    1:num <span class="Special">&lt;-</span> <a href='factorial.mu.html#L10'>factorial</a><span class="Constant"> 5</span>
+<span id="L28" class="LineNr">28 </span>  <span class="Conceal">¦</span> 1:num <span class="Special">&lt;-</span> <a href='factorial.mu.html#L10'>factorial</a><span class="Constant"> 5</span>
 <span id="L29" class="LineNr">29 </span>  ]
 <span id="L30" class="LineNr">30 </span>  memory-should-contain [
-<span id="L31" class="LineNr">31 </span>   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 120</span>
+<span id="L31" class="LineNr">31 </span>  <span class="Conceal">¦</span><span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 120</span>
 <span id="L32" class="LineNr">32 </span>  ]
 <span id="L33" class="LineNr">33 </span>]
 </pre>
diff --git a/html/filesystem.mu.html b/html/filesystem.mu.html
index 6e04a561..b4613166 100644
--- a/html/filesystem.mu.html
+++ b/html/filesystem.mu.html
@@ -15,13 +15,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
+.Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -66,10 +67,10 @@ if ('onhashchange' in window) {
 <span id="L8" class="LineNr"> 8 </span>  source-file:&amp;:source:char <span class="Special">&lt;-</span> <a href='088file.mu.html#L21'>start-reading</a> <span class="Constant">0/real-filesystem</span>, <span class="Constant">[/tmp/mu-x]</span>
 <span id="L9" class="LineNr"> 9 </span>  sink-file:&amp;:sink:char, write-routine:num <span class="Special">&lt;-</span> <a href='088file.mu.html#L105'>start-writing</a> <span class="Constant">0/real-filesystem</span>, <span class="Constant">[/tmp/mu-y]</span>
 <span id="L10" class="LineNr">10 </span>  <span class="Delimiter">{</span>
-<span id="L11" class="LineNr">11 </span>    c:char, done?:bool, source-file <span class="Special">&lt;-</span> read source-file
-<span id="L12" class="LineNr">12 </span>    <span class="muControl">break-if</span> done?
-<span id="L13" class="LineNr">13 </span>    sink-file <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink-file, c
-<span id="L14" class="LineNr">14 </span>    <span class="muControl">loop</span>
+<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span> c:char, done?:bool, source-file <span class="Special">&lt;-</span> read source-file
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> sink-file <span class="Special">&lt;-</span> <a href='075channel.mu.html#L66'>write</a> sink-file, c
+<span id="L14" class="LineNr">14 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L15" class="LineNr">15 </span>  <span class="Delimiter">}</span>
 <span id="L16" class="LineNr">16 </span>  close sink-file
 <span id="L17" class="LineNr">17 </span>  <span class="Comment"># make sure to wait for the file to be actually written to disk</span>
diff --git a/html/fork.mu.html b/html/fork.mu.html
index 0e2c653e..713ad57d 100644
--- a/html/fork.mu.html
+++ b/html/fork.mu.html
@@ -15,12 +15,13 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Constant { color: #00a0a0; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #800080; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.Constant { color: #00a0a0; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -60,15 +61,15 @@ if ('onhashchange' in window) {
 <span id="L3" class="LineNr"> 3 </span><span class="muRecipe">def</span> <a href='fork.mu.html#L3'>main</a> [
 <span id="L4" class="LineNr"> 4 </span>  start-running <a href='fork.mu.html#L11'>thread2</a>
 <span id="L5" class="LineNr"> 5 </span>  <span class="Delimiter">{</span>
-<span id="L6" class="LineNr"> 6 </span>    $print<span class="Constant"> 34</span>
-<span id="L7" class="LineNr"> 7 </span>    <span class="muControl">loop</span>
+<span id="L6" class="LineNr"> 6 </span>  <span class="Conceal">¦</span> $print<span class="Constant"> 34</span>
+<span id="L7" class="LineNr"> 7 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L8" class="LineNr"> 8 </span>  <span class="Delimiter">}</span>
 <span id="L9" class="LineNr"> 9 </span>]
 <span id="L10" class="LineNr">10 </span>
 <span id="L11" class="LineNr">11 </span><span class="muRecipe">def</span> <a href='fork.mu.html#L11'>thread2</a> [
 <span id="L12" class="LineNr">12 </span>  <span class="Delimiter">{</span>
-<span id="L13" class="LineNr">13 </span>    $print<span class="Constant"> 35</span>
-<span id="L14" class="LineNr">14 </span>    <span class="muControl">loop</span>
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> $print<span class="Constant"> 35</span>
+<span id="L14" class="LineNr">14 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L15" class="LineNr">15 </span>  <span class="Delimiter">}</span>
 <span id="L16" class="LineNr">16 </span>]
 </pre>
diff --git a/html/global.mu.html b/html/global.mu.html
index 41bf228e..e2f71850 100644
--- a/html/global.mu.html
+++ b/html/global.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/http-client.mu.html b/html/http-client.mu.html
index 92e0df2d..a72c1795 100644
--- a/html/http-client.mu.html
+++ b/html/http-client.mu.html
@@ -15,13 +15,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
+.Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -64,11 +65,11 @@ if ('onhashchange' in window) {
 <span id="L6" class="LineNr"> 6 </span>  n:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L7" class="LineNr"> 7 </span>  buf:&amp;:<a href='061text.mu.html#L127'>buffer</a> <span class="Special">&lt;-</span> <a href='061text.mu.html#L132'>new-buffer</a><span class="Constant"> 30</span>
 <span id="L8" class="LineNr"> 8 </span>  <span class="Delimiter">{</span>
-<span id="L9" class="LineNr"> 9 </span>    c:char, done?:bool <span class="Special">&lt;-</span> read google
-<span id="L10" class="LineNr">10 </span>    <span class="muControl">break-if</span> done?
-<span id="L11" class="LineNr">11 </span>    n <span class="Special">&lt;-</span> add n,<span class="Constant"> 1</span>
-<span id="L12" class="LineNr">12 </span>    buf <span class="Special">&lt;-</span> append buf, c
-<span id="L13" class="LineNr">13 </span>    <span class="muControl">loop</span>
+<span id="L9" class="LineNr"> 9 </span>  <span class="Conceal">¦</span> c:char, done?:bool <span class="Special">&lt;-</span> read google
+<span id="L10" class="LineNr">10 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L11" class="LineNr">11 </span>  <span class="Conceal">¦</span> n <span class="Special">&lt;-</span> add n,<span class="Constant"> 1</span>
+<span id="L12" class="LineNr">12 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L13" class="LineNr">13 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L14" class="LineNr">14 </span>  <span class="Delimiter">}</span>
 <span id="L15" class="LineNr">15 </span>  result:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> buf
 <span id="L16" class="LineNr">16 </span>  open-console
diff --git a/html/http-server.mu.html b/html/http-server.mu.html
index ac913d62..aa2048bd 100644
--- a/html/http-server.mu.html
+++ b/html/http-server.mu.html
@@ -15,12 +15,12 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
diff --git a/html/immutable-error.mu.html b/html/immutable-error.mu.html
index 83509618..32ffa485 100644
--- a/html/immutable-error.mu.html
+++ b/html/immutable-error.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/lambda-to-mu.mu.html b/html/lambda-to-mu.mu.html
index 2aa7689b..92edd7c5 100644
--- a/html/lambda-to-mu.mu.html
+++ b/html/lambda-to-mu.mu.html
@@ -15,17 +15,18 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.Conceal { color: #4e4e4e; }
+.muScenario { color: #00af00; }
 .Special { color: #c00000; }
 .Delimiter { color: #800080; }
 .SalientComment { color: #00ffff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.CommentedCode { color: #6c6c6c; }
-.Comment { color: #9090ff; }
 .muRecipe { color: #ff8700; }
-.muScenario { color: #00af00; }
+.Comment { color: #9090ff; }
+.muControl { color: #c0a020; }
+.CommentedCode { color: #6c6c6c; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -71,12 +72,12 @@ if ('onhashchange' in window) {
 <span id="L9" class="LineNr">  9 </span>
 <span id="L10" class="LineNr"> 10 </span><span class="muScenario">scenario</span> convert-lambda [
 <span id="L11" class="LineNr"> 11 </span>  run [
-<span id="L12" class="LineNr"> 12 </span>    <span class="Constant">local-scope</span>
-<span id="L13" class="LineNr"> 13 </span>    1:text/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L22'>lambda-to-mu</a> <span class="Constant">[(add a (multiply b c))]</span>
-<span id="L14" class="LineNr"> 14 </span>    2:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *1:text/<span class="Special">raw</span>
+<span id="L12" class="LineNr"> 12 </span>  <span class="Conceal">¦</span> <span class="Constant">local-scope</span>
+<span id="L13" class="LineNr"> 13 </span>  <span class="Conceal">¦</span> 1:text/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L22'>lambda-to-mu</a> <span class="Constant">[(add a (multiply b c))]</span>
+<span id="L14" class="LineNr"> 14 </span>  <span class="Conceal">¦</span> 2:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *1:text/<span class="Special">raw</span>
 <span id="L15" class="LineNr"> 15 </span>  ]
 <span id="L16" class="LineNr"> 16 </span>  memory-should-contain [
-<span id="L17" class="LineNr"> 17 </span>    2:array:character <span class="Special">&lt;-</span> <span class="Constant">[t1 &lt;- multiply b c</span>
+<span id="L17" class="LineNr"> 17 </span>  <span class="Conceal">¦</span> 2:array:character <span class="Special">&lt;-</span> <span class="Constant">[t1 &lt;- multiply b c</span>
 <span id="L18" class="LineNr"> 18 </span><span class="Constant">result &lt;- add a t1]</span>
 <span id="L19" class="LineNr"> 19 </span>  ]
 <span id="L20" class="LineNr"> 20 </span>]
@@ -136,8 +137,8 @@ if ('onhashchange' in window) {
 <span id="L74" class="LineNr"> 74 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L56'>is-atom?</a> x
 <span id="L75" class="LineNr"> 75 </span>  11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L76" class="LineNr"> 76 </span>  memory-should-contain [
-<span id="L77" class="LineNr"> 77 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L78" class="LineNr"> 78 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L78" class="LineNr"> 78 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
 <span id="L79" class="LineNr"> 79 </span>  ]
 <span id="L80" class="LineNr"> 80 </span>]
 <span id="L81" class="LineNr"> 81 </span>
@@ -150,8 +151,8 @@ if ('onhashchange' in window) {
 <span id="L88" class="LineNr"> 88 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L56'>is-atom?</a> y
 <span id="L89" class="LineNr"> 89 </span>  11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> y
 <span id="L90" class="LineNr"> 90 </span>  memory-should-contain [
-<span id="L91" class="LineNr"> 91 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L92" class="LineNr"> 92 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L92" class="LineNr"> 92 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
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 <span id="L95" class="LineNr"> 95 </span>
@@ -168,7 +169,7 @@ if ('onhashchange' in window) {
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 <span id="L107" class="LineNr">107 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L96'>atom-match?</a> x, <span class="Constant">[abc]</span>
 <span id="L108" class="LineNr">108 </span>  memory-should-contain [
-<span id="L109" class="LineNr">109 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
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 <span id="L112" class="LineNr">112 </span>
@@ -213,8 +214,8 @@ if ('onhashchange' in window) {
 <span id="L151" class="LineNr">151 </span>  10:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> first x
 <span id="L152" class="LineNr">152 </span>  11:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> rest x
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-<span id="L154" class="LineNr">154 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first is nil</span>
-<span id="L155" class="LineNr">155 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest is nil</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># first is nil</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest is nil</span>
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@@ -228,8 +229,8 @@ if ('onhashchange' in window) {
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 <span id="L167" class="LineNr">167 </span>  11:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> rest y
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-<span id="L170" class="LineNr">170 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest is nil</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># first is correct</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># rest is nil</span>
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@@ -252,84 +253,84 @@ if ('onhashchange' in window) {
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-<span id="L193" class="LineNr">193 </span>    <span class="muControl">break-if</span> pair?
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-<span id="L198" class="LineNr">198 </span>      <span class="muControl">break-if</span> done?
-<span id="L199" class="LineNr">199 </span>      <span class="Comment"># stop before close paren or space</span>
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-<span id="L201" class="LineNr">201 </span>      done? <span class="Special">&lt;-</span> equal c, <span class="Constant">41/close-paren</span>
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-<span id="L210" class="LineNr">210 </span>    out <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L42'>new-atom</a> s
+<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> pair?
+<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Comment"># atom</span>
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+<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> <a href='066stream.mu.html#L67'>end-of-stream?</a> in
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># stop before close paren or space</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
+<span id="L201" class="LineNr">201 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done? <span class="Special">&lt;-</span> equal c, <span class="Constant">41/close-paren</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> done? <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> c
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c <span class="Special">&lt;-</span> read in
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, c
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> s:text <span class="Special">&lt;-</span> <a href='061text.mu.html#L329'>buffer-to-array</a> buf
+<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> out <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L42'>new-atom</a> s
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-<span id="L213" class="LineNr">213 </span>    <span class="muControl">break-unless</span> pair?
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-<span id="L216" class="LineNr">216 </span>    out <span class="Special">&lt;-</span> new <span class="Constant"><a href='lambda-to-mu.mu.html#L31'>cell</a>:type</span>  <span class="Comment"># start out with nil</span>
-<span id="L217" class="LineNr">217 </span>    <span class="Comment"># read in first element of pair</span>
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-<span id="L230" class="LineNr">230 </span>    <span class="Delimiter">{</span>
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-<span id="L246" class="LineNr">246 </span>      <span class="Delimiter">{</span>
-<span id="L247" class="LineNr">247 </span>        <span class="muControl">break-if</span> is-dot?
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-<span id="L249" class="LineNr">249 </span>        curr <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L138'>set-rest</a> curr, next-curr
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-<span id="L253" class="LineNr">253 </span>        <span class="muControl">break-unless</span> is-dot?
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+<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> pair?
+<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="Comment"># pair</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> read in  <span class="Comment"># skip the open-paren</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> out <span class="Special">&lt;-</span> new <span class="Constant"><a href='lambda-to-mu.mu.html#L31'>cell</a>:type</span>  <span class="Comment"># start out with nil</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> <span class="Comment"># read in first element of pair</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> end?:bool <span class="Special">&lt;-</span> <a href='066stream.mu.html#L67'>end-of-stream?</a> in
+<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> not-end?:bool <span class="Special">&lt;-</span> not end?
+<span id="L221" class="LineNr">221 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert not-end?, <span class="Constant">[unbalanced '(' in expression]</span>
+<span id="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
+<span id="L223" class="LineNr">223 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> close-paren?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">41/close-paren</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> close-paren?
+<span id="L225" class="LineNr">225 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> first:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a>, in <span class="Special">&lt;-</span> parse in
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> *out <span class="Special">&lt;-</span> merge <span class="Constant">1/pair</span>, first, <span class="Constant">0/nil</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="Comment"># read in any remaining elements</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> curr:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> copy out
+<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> in <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L274'>skip-whitespace</a> in
+<span id="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> end?:bool <span class="Special">&lt;-</span> <a href='066stream.mu.html#L67'>end-of-stream?</a> in
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> not-end?:bool <span class="Special">&lt;-</span> not end?
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert not-end?, <span class="Constant">[unbalanced '(' in expression]</span>
+<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># termination check: ')'</span>
+<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> c <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
+<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> close-paren?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">41/close-paren</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> close-paren?
+<span id="L240" class="LineNr">240 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> read in  <span class="Comment"># skip ')'</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break</span> <span class="Constant">+end-pair</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># still here? read next element of pair</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='065duplex_list.mu.html#L29'>next</a>:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a>, in <span class="Special">&lt;-</span> parse in
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> is-dot?:bool <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L96'>atom-match?</a> <a href='065duplex_list.mu.html#L29'>next</a>, <span class="Constant">[.]</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> is-dot?
+<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> next-curr:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L49'>new-pair</a> <a href='065duplex_list.mu.html#L29'>next</a>, <span class="Constant">0/nil</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L138'>set-rest</a> curr, next-curr
+<span id="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> rest curr
+<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-dot?
+<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># deal with dotted pair</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> in <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L274'>skip-whitespace</a> in
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> c <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
+<span id="L257" class="LineNr">257 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> not-close-paren?:bool <span class="Special">&lt;-</span> not-equal c, <span class="Constant">41/close-paren</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert not-close-paren?, <span class="Constant">[')' cannot immediately follow '.']</span>
+<span id="L259" class="LineNr">259 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> final:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse in
+<span id="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L138'>set-rest</a> curr, final
+<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># we're not gonna update curr, so better make sure the next iteration</span>
+<span id="L262" class="LineNr">262 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># is going to end the pair</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> in <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L274'>skip-whitespace</a> in
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> c <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> close-paren?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">41/close-paren</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> assert close-paren?, <span class="Constant">['.' must be followed by exactly one expression before ')']</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L269" class="LineNr">269 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L270" class="LineNr">270 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +end-pair</span>
 <span id="L271" class="LineNr">271 </span>  <span class="Delimiter">}</span>
 <span id="L272" class="LineNr">272 </span>]
 <span id="L273" class="LineNr">273 </span>
@@ -337,13 +338,13 @@ if ('onhashchange' in window) {
 <span id="L275" class="LineNr">275 </span>  <span class="Constant">local-scope</span>
 <span id="L276" class="LineNr">276 </span>  <span class="Constant">load-ingredients</span>
 <span id="L277" class="LineNr">277 </span>  <span class="Delimiter">{</span>
-<span id="L278" class="LineNr">278 </span>    done?:bool <span class="Special">&lt;-</span> <a href='066stream.mu.html#L67'>end-of-stream?</a> in
-<span id="L279" class="LineNr">279 </span>    <span class="muControl">return-if</span> done?, <span class="Constant">0/null</span>
-<span id="L280" class="LineNr">280 </span>    c:char <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
-<span id="L281" class="LineNr">281 </span>    <a href='061text.mu.html#L620'>space?</a>:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> c
-<span id="L282" class="LineNr">282 </span>    <span class="muControl">break-unless</span> <a href='061text.mu.html#L620'>space?</a>
-<span id="L283" class="LineNr">283 </span>    read in  <span class="Comment"># skip</span>
-<span id="L284" class="LineNr">284 </span>    <span class="muControl">loop</span>
+<span id="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> <a href='066stream.mu.html#L67'>end-of-stream?</a> in
+<span id="L279" class="LineNr">279 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> done?, <span class="Constant">0/null</span>
+<span id="L280" class="LineNr">280 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> <a href='066stream.mu.html#L39'>peek</a> in
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span> <a href='061text.mu.html#L620'>space?</a>:bool <span class="Special">&lt;-</span> <a href='061text.mu.html#L620'>space?</a> c
+<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> <a href='061text.mu.html#L620'>space?</a>
+<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> read in  <span class="Comment"># skip</span>
+<span id="L284" class="LineNr">284 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L285" class="LineNr">285 </span>  <span class="Delimiter">}</span>
 <span id="L286" class="LineNr">286 </span>]
 <span id="L287" class="LineNr">287 </span>
@@ -360,16 +361,16 @@ if ('onhashchange' in window) {
 <span id="L298" class="LineNr">298 </span>  <span class="Constant">load-ingredients</span>
 <span id="L299" class="LineNr">299 </span>  <span class="Comment"># base case: empty cell</span>
 <span id="L300" class="LineNr">300 </span>  <span class="Delimiter">{</span>
-<span id="L301" class="LineNr">301 </span>    <span class="muControl">break-if</span> x
-<span id="L302" class="LineNr">302 </span>    buf <span class="Special">&lt;-</span> append buf, <span class="Constant">[&lt;&gt;]</span>
-<span id="L303" class="LineNr">303 </span>    <span class="muControl">return</span>
+<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> x
+<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, <span class="Constant">[&lt;&gt;]</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L304" class="LineNr">304 </span>  <span class="Delimiter">}</span>
 <span id="L305" class="LineNr">305 </span>  <span class="Comment"># base case: atom</span>
 <span id="L306" class="LineNr">306 </span>  <span class="Delimiter">{</span>
-<span id="L307" class="LineNr">307 </span>    s:text, atom?:bool <span class="Special">&lt;-</span> maybe-convert *x, <span class="Constant">atom:variant</span>
-<span id="L308" class="LineNr">308 </span>    <span class="muControl">break-unless</span> atom?
-<span id="L309" class="LineNr">309 </span>    buf <span class="Special">&lt;-</span> append buf, s
-<span id="L310" class="LineNr">310 </span>    <span class="muControl">return</span>
+<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> s:text, atom?:bool <span class="Special">&lt;-</span> maybe-convert *x, <span class="Constant">atom:variant</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> atom?
+<span id="L309" class="LineNr">309 </span>  <span class="Conceal">¦</span> buf <span class="Special">&lt;-</span> append buf, s
+<span id="L310" class="LineNr">310 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
 <span id="L311" class="LineNr">311 </span>  <span class="Delimiter">}</span>
 <span id="L312" class="LineNr">312 </span>  <span class="Comment"># recursive case: pair</span>
 <span id="L313" class="LineNr">313 </span>  buf <span class="Special">&lt;-</span> append buf, <span class="Constant">[&lt; ]</span>
@@ -388,8 +389,8 @@ if ('onhashchange' in window) {
 <span id="L326" class="LineNr">326 </span>  s2:text, 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> maybe-convert *x, <span class="Constant">atom:variant</span>
 <span id="L327" class="LineNr">327 </span>  11:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L328" class="LineNr">328 </span>  memory-should-contain [
-<span id="L329" class="LineNr">329 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is an atom</span>
-<span id="L330" class="LineNr">330 </span>    11:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is an atom</span>
+<span id="L330" class="LineNr">330 </span>  <span class="Conceal">¦</span> 11:array:character <span class="Special">&lt;-</span> <span class="Constant">[a]</span>
 <span id="L331" class="LineNr">331 </span>  ]
 <span id="L332" class="LineNr">332 </span>]
 <span id="L333" class="LineNr">333 </span>
@@ -400,8 +401,8 @@ if ('onhashchange' in window) {
 <span id="L338" class="LineNr">338 </span>  s2:text, 10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> maybe-convert *x, <span class="Constant">atom:variant</span>
 <span id="L339" class="LineNr">339 </span>  11:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L340" class="LineNr">340 </span>  memory-should-contain [
-<span id="L341" class="LineNr">341 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is an atom</span>
-<span id="L342" class="LineNr">342 </span>    11:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
+<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is an atom</span>
+<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span> 11:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>
 <span id="L343" class="LineNr">343 </span>  ]
 <span id="L344" class="LineNr">344 </span>]
 <span id="L345" class="LineNr">345 </span>
@@ -410,7 +411,7 @@ if ('onhashchange' in window) {
 <span id="L348" class="LineNr">348 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[(abc def)]</span>
 <span id="L349" class="LineNr">349 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
 <span id="L350" class="LineNr">350 </span>  trace-should-contain [
-<span id="L351" class="LineNr">351 </span>    app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
+<span id="L351" class="LineNr">351 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
 <span id="L352" class="LineNr">352 </span>  ]
 <span id="L353" class="LineNr">353 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L354" class="LineNr">354 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -423,13 +424,13 @@ if ('onhashchange' in window) {
 <span id="L361" class="LineNr">361 </span>  20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s1
 <span id="L362" class="LineNr">362 </span>  30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L363" class="LineNr">363 </span>  memory-should-contain [
-<span id="L364" class="LineNr">364 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L365" class="LineNr">365 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
-<span id="L366" class="LineNr">366 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
-<span id="L367" class="LineNr">367 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
-<span id="L368" class="LineNr">368 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest is nil</span>
-<span id="L369" class="LineNr">369 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
-<span id="L370" class="LineNr">370 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
+<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
+<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
+<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest is nil</span>
+<span id="L369" class="LineNr">369 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
+<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
 <span id="L371" class="LineNr">371 </span>  ]
 <span id="L372" class="LineNr">372 </span>]
 <span id="L373" class="LineNr">373 </span>
@@ -438,7 +439,7 @@ if ('onhashchange' in window) {
 <span id="L376" class="LineNr">376 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[ ( abc  def ) ]</span>  <span class="Comment"># extra spaces</span>
 <span id="L377" class="LineNr">377 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
 <span id="L378" class="LineNr">378 </span>  trace-should-contain [
-<span id="L379" class="LineNr">379 </span>    app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
+<span id="L379" class="LineNr">379 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
 <span id="L380" class="LineNr">380 </span>  ]
 <span id="L381" class="LineNr">381 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L382" class="LineNr">382 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -451,13 +452,13 @@ if ('onhashchange' in window) {
 <span id="L389" class="LineNr">389 </span>  20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s1
 <span id="L390" class="LineNr">390 </span>  30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
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-<span id="L392" class="LineNr">392 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L393" class="LineNr">393 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
-<span id="L394" class="LineNr">394 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
-<span id="L395" class="LineNr">395 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
-<span id="L396" class="LineNr">396 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest is nil</span>
-<span id="L397" class="LineNr">397 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
-<span id="L398" class="LineNr">398 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
+<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
+<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
+<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest is nil</span>
+<span id="L397" class="LineNr">397 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
+<span id="L398" class="LineNr">398 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
 <span id="L399" class="LineNr">399 </span>  ]
 <span id="L400" class="LineNr">400 </span>]
 <span id="L401" class="LineNr">401 </span>
@@ -466,7 +467,7 @@ if ('onhashchange' in window) {
 <span id="L404" class="LineNr">404 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[(abc def ghi)]</span>
 <span id="L405" class="LineNr">405 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
 <span id="L406" class="LineNr">406 </span>  trace-should-contain [
-<span id="L407" class="LineNr">407 </span>    app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;</span> ghi <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
+<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;</span> ghi <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
 <span id="L408" class="LineNr">408 </span>  ]
 <span id="L409" class="LineNr">409 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L410" class="LineNr">410 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -484,16 +485,16 @@ if ('onhashchange' in window) {
 <span id="L422" class="LineNr">422 </span>  30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L423" class="LineNr">423 </span>  40:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s3
 <span id="L424" class="LineNr">424 </span>  memory-should-contain [
-<span id="L425" class="LineNr">425 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L426" class="LineNr">426 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
-<span id="L427" class="LineNr">427 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
-<span id="L428" class="LineNr">428 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
-<span id="L429" class="LineNr">429 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.rest is a pair</span>
-<span id="L430" class="LineNr">430 </span>   <span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.rest.first is an atom</span>
-<span id="L431" class="LineNr">431 </span>   <span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest.rest is nil</span>
-<span id="L432" class="LineNr">432 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
-<span id="L433" class="LineNr">433 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
-<span id="L434" class="LineNr">434 </span>    40:array:character <span class="Special">&lt;-</span> <span class="Constant">[ghi]</span>  <span class="Comment"># result.rest.rest</span>
+<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
+<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
+<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
+<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.rest is a pair</span>
+<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span><span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.rest.first is an atom</span>
+<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span><span class="Constant"> 16</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest.rest is nil</span>
+<span id="L432" class="LineNr">432 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
+<span id="L434" class="LineNr">434 </span>  <span class="Conceal">¦</span> 40:array:character <span class="Special">&lt;-</span> <span class="Constant">[ghi]</span>  <span class="Comment"># result.rest.rest</span>
 <span id="L435" class="LineNr">435 </span>  ]
 <span id="L436" class="LineNr">436 </span>]
 <span id="L437" class="LineNr">437 </span>
@@ -502,7 +503,7 @@ if ('onhashchange' in window) {
 <span id="L440" class="LineNr">440 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[((abc))]</span>
 <span id="L441" class="LineNr">441 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
 <span id="L442" class="LineNr">442 </span>  trace-should-contain [
-<span id="L443" class="LineNr">443 </span>    app/parse: <span class="Constant">&lt;</span> <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span>
+<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span>
 <span id="L444" class="LineNr">444 </span>  ]
 <span id="L445" class="LineNr">445 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L446" class="LineNr">446 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -513,12 +514,12 @@ if ('onhashchange' in window) {
 <span id="L451" class="LineNr">451 </span>  14:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a>/<span class="Special">raw</span> <span class="Special">&lt;-</span> rest x
 <span id="L452" class="LineNr">452 </span>  20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s1
 <span id="L453" class="LineNr">453 </span>  memory-should-contain [
-<span id="L454" class="LineNr">454 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L455" class="LineNr">455 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is a pair</span>
-<span id="L456" class="LineNr">456 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first.first is an atom</span>
-<span id="L457" class="LineNr">457 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.first.rest is nil</span>
-<span id="L458" class="LineNr">458 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest is nil</span>
-<span id="L459" class="LineNr">459 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first.first</span>
+<span id="L454" class="LineNr">454 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L455" class="LineNr">455 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is a pair</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first.first is an atom</span>
+<span id="L457" class="LineNr">457 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.first.rest is nil</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest is nil</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first.first</span>
 <span id="L460" class="LineNr">460 </span>  ]
 <span id="L461" class="LineNr">461 </span>]
 <span id="L462" class="LineNr">462 </span>
@@ -527,7 +528,7 @@ if ('onhashchange' in window) {
 <span id="L465" class="LineNr">465 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[((abc) def)]</span>
 <span id="L466" class="LineNr">466 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
 <span id="L467" class="LineNr">467 </span>  trace-should-contain [
-<span id="L468" class="LineNr">468 </span>    app/parse: <span class="Constant">&lt;</span> <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> <span class="Constant">&lt;&gt;</span> <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
 <span id="L469" class="LineNr">469 </span>  ]
 <span id="L470" class="LineNr">470 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L471" class="LineNr">471 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -542,14 +543,14 @@ if ('onhashchange' in window) {
 <span id="L480" class="LineNr">480 </span>  20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s1
 <span id="L481" class="LineNr">481 </span>  30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L482" class="LineNr">482 </span>  memory-should-contain [
-<span id="L483" class="LineNr">483 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L484" class="LineNr">484 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is a pair</span>
-<span id="L485" class="LineNr">485 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first.first is an atom</span>
-<span id="L486" class="LineNr">486 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.first.rest is nil</span>
-<span id="L487" class="LineNr">487 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
-<span id="L488" class="LineNr">488 </span>   <span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest is nil</span>
-<span id="L489" class="LineNr">489 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first.first</span>
-<span id="L490" class="LineNr">490 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
+<span id="L483" class="LineNr">483 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L484" class="LineNr">484 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is a pair</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first.first is an atom</span>
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.first.rest is nil</span>
+<span id="L487" class="LineNr">487 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
+<span id="L488" class="LineNr">488 </span>  <span class="Conceal">¦</span><span class="Constant"> 15</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># result.rest.rest is nil</span>
+<span id="L489" class="LineNr">489 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first.first</span>
+<span id="L490" class="LineNr">490 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
 <span id="L491" class="LineNr">491 </span>  ]
 <span id="L492" class="LineNr">492 </span>]
 <span id="L493" class="LineNr">493 </span>
@@ -582,7 +583,7 @@ if ('onhashchange' in window) {
 <span id="L520" class="LineNr">520 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[(abc . def)]</span>
 <span id="L521" class="LineNr">521 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
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-<span id="L523" class="LineNr">523 </span>    app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> def <span class="Constant">&gt;</span>
+<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> def <span class="Constant">&gt;</span>
 <span id="L524" class="LineNr">524 </span>  ]
 <span id="L525" class="LineNr">525 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L526" class="LineNr">526 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -592,12 +593,12 @@ if ('onhashchange' in window) {
 <span id="L530" class="LineNr">530 </span>  20:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s1
 <span id="L531" class="LineNr">531 </span>  30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L532" class="LineNr">532 </span>  memory-should-contain [
-<span id="L533" class="LineNr">533 </span>    <span class="Comment"># parses to &lt; abc | def &gt;</span>
-<span id="L534" class="LineNr">534 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L535" class="LineNr">535 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
-<span id="L536" class="LineNr">536 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is an atom</span>
-<span id="L537" class="LineNr">537 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
-<span id="L538" class="LineNr">538 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest</span>
+<span id="L533" class="LineNr">533 </span>  <span class="Conceal">¦</span> <span class="Comment"># parses to &lt; abc | def &gt;</span>
+<span id="L534" class="LineNr">534 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
+<span id="L536" class="LineNr">536 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is an atom</span>
+<span id="L537" class="LineNr">537 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
+<span id="L538" class="LineNr">538 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest</span>
 <span id="L539" class="LineNr">539 </span>  ]
 <span id="L540" class="LineNr">540 </span>]
 <span id="L541" class="LineNr">541 </span>
@@ -606,7 +607,7 @@ if ('onhashchange' in window) {
 <span id="L544" class="LineNr">544 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[(abc def . ghi)]</span>
 <span id="L545" class="LineNr">545 </span>  x:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> parse s
 <span id="L546" class="LineNr">546 </span>  trace-should-contain [
-<span id="L547" class="LineNr">547 </span>    app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> ghi <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
+<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> app/parse: <span class="Constant">&lt;</span> abc <span class="Constant">|</span> <span class="Constant">&lt;</span> def <span class="Constant">|</span> ghi <span class="Constant">&gt;</span> <span class="Constant">&gt;</span>
 <span id="L548" class="LineNr">548 </span>  ]
 <span id="L549" class="LineNr">549 </span>  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> <a href='lambda-to-mu.mu.html#L63'>is-pair?</a> x
 <span id="L550" class="LineNr">550 </span>  x1:&amp;:<a href='lambda-to-mu.mu.html#L31'>cell</a> <span class="Special">&lt;-</span> first x
@@ -621,14 +622,14 @@ if ('onhashchange' in window) {
 <span id="L559" class="LineNr">559 </span>  30:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s2
 <span id="L560" class="LineNr">560 </span>  40:@:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *s3
 <span id="L561" class="LineNr">561 </span>  memory-should-contain [
-<span id="L562" class="LineNr">562 </span>   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
-<span id="L563" class="LineNr">563 </span>   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
-<span id="L564" class="LineNr">564 </span>   <span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
-<span id="L565" class="LineNr">565 </span>   <span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
-<span id="L566" class="LineNr">566 </span>   <span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.rest is an atom</span>
-<span id="L567" class="LineNr">567 </span>    20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
-<span id="L568" class="LineNr">568 </span>    30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
-<span id="L569" class="LineNr">569 </span>    40:array:character <span class="Special">&lt;-</span> <span class="Constant">[ghi]</span>  <span class="Comment"># result.rest.rest</span>
+<span id="L562" class="LineNr">562 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># parse result is a pair</span>
+<span id="L563" class="LineNr">563 </span>  <span class="Conceal">¦</span><span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.first is an atom</span>
+<span id="L564" class="LineNr">564 </span>  <span class="Conceal">¦</span><span class="Constant"> 12</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest is a pair</span>
+<span id="L565" class="LineNr">565 </span>  <span class="Conceal">¦</span><span class="Constant"> 13</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.first is an atom</span>
+<span id="L566" class="LineNr">566 </span>  <span class="Conceal">¦</span><span class="Constant"> 14</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># result.rest.rest is an atom</span>
+<span id="L567" class="LineNr">567 </span>  <span class="Conceal">¦</span> 20:array:character <span class="Special">&lt;-</span> <span class="Constant">[abc]</span>  <span class="Comment"># result.first</span>
+<span id="L568" class="LineNr">568 </span>  <span class="Conceal">¦</span> 30:array:character <span class="Special">&lt;-</span> <span class="Constant">[def]</span>  <span class="Comment"># result.rest.first</span>
+<span id="L569" class="LineNr">569 </span>  <span class="Conceal">¦</span> 40:array:character <span class="Special">&lt;-</span> <span class="Constant">[ghi]</span>  <span class="Comment"># result.rest.rest</span>
 <span id="L570" class="LineNr">570 </span>  ]
 <span id="L571" class="LineNr">571 </span>]
 <span id="L572" class="LineNr">572 </span>
diff --git a/html/mutable.mu.html b/html/mutable.mu.html
index 7669224d..4a0a1166 100644
--- a/html/mutable.mu.html
+++ b/html/mutable.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/nqueens.mu.html b/html/nqueens.mu.html
index 6035fb3d..e541430a 100644
--- a/html/nqueens.mu.html
+++ b/html/nqueens.mu.html
@@ -15,14 +15,15 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
-.muData { color: #ffff00; }
-.muControl { color: #c0a020; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
+.muData { color: #ffff00; }
 -->
 </style>
 
@@ -73,35 +74,35 @@ if ('onhashchange' in window) {
 <span id="L14" class="LineNr">14 </span>  <span class="Comment"># if 'queens' is already long enough, print it and return</span>
 <span id="L15" class="LineNr">15 </span>  added-so-far:num <span class="Special">&lt;-</span> length queens
 <span id="L16" class="LineNr">16 </span>  <span class="Delimiter">{</span>
-<span id="L17" class="LineNr">17 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal added-so-far, n
-<span id="L18" class="LineNr">18 </span>    <span class="muControl">break-unless</span> done?
-<span id="L19" class="LineNr">19 </span>    stash queens
-<span id="L20" class="LineNr">20 </span>    <span class="muControl">return</span><span class="Constant"> 1</span>
+<span id="L17" class="LineNr">17 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal added-so-far, n
+<span id="L18" class="LineNr">18 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> done?
+<span id="L19" class="LineNr">19 </span>  <span class="Conceal">¦</span> stash queens
+<span id="L20" class="LineNr">20 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span><span class="Constant"> 1</span>
 <span id="L21" class="LineNr">21 </span>  <span class="Delimiter">}</span>
 <span id="L22" class="LineNr">22 </span>  <span class="Comment"># still work to do</span>
 <span id="L23" class="LineNr">23 </span>  next-rank:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L24" class="LineNr">24 </span>  <span class="Delimiter">{</span>
-<span id="L25" class="LineNr">25 </span>    <span class="muControl">break-unless</span> queens
-<span id="L26" class="LineNr">26 </span>    first:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> first queens
-<span id="L27" class="LineNr">27 </span>    existing-rank:num <span class="Special">&lt;-</span> get first, <span class="Constant">rank:offset</span>
-<span id="L28" class="LineNr">28 </span>    next-rank <span class="Special">&lt;-</span> add existing-rank,<span class="Constant"> 1</span>
+<span id="L25" class="LineNr">25 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens
+<span id="L26" class="LineNr">26 </span>  <span class="Conceal">¦</span> first:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> first queens
+<span id="L27" class="LineNr">27 </span>  <span class="Conceal">¦</span> existing-rank:num <span class="Special">&lt;-</span> get first, <span class="Constant">rank:offset</span>
+<span id="L28" class="LineNr">28 </span>  <span class="Conceal">¦</span> next-rank <span class="Special">&lt;-</span> add existing-rank,<span class="Constant"> 1</span>
 <span id="L29" class="LineNr">29 </span>  <span class="Delimiter">}</span>
 <span id="L30" class="LineNr">30 </span>  result <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L31" class="LineNr">31 </span>  next-file:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
 <span id="L32" class="LineNr">32 </span>  <span class="Delimiter">{</span>
-<span id="L33" class="LineNr">33 </span>    done?:bool <span class="Special">&lt;-</span> greater-or-equal next-file, n
-<span id="L34" class="LineNr">34 </span>    <span class="muControl">break-if</span> done?
-<span id="L35" class="LineNr">35 </span>    curr:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> merge next-rank, next-file
-<span id="L36" class="LineNr">36 </span>    <span class="Delimiter">{</span>
-<span id="L37" class="LineNr">37 </span>      curr-conflicts?:bool <span class="Special">&lt;-</span> <a href='nqueens.mu.html#L49'>conflict?</a> curr, queens
-<span id="L38" class="LineNr">38 </span>      <span class="muControl">break-if</span> curr-conflicts?
-<span id="L39" class="LineNr">39 </span>      queens:&amp;:list:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> push curr, queens
-<span id="L40" class="LineNr">40 </span>      sub-result:num <span class="Special">&lt;-</span> <a href='nqueens.mu.html#L11'>nqueens</a> n, queens
-<span id="L41" class="LineNr">41 </span>      result <span class="Special">&lt;-</span> add result, sub-result
-<span id="L42" class="LineNr">42 </span>      queens <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> queens
-<span id="L43" class="LineNr">43 </span>    <span class="Delimiter">}</span>
-<span id="L44" class="LineNr">44 </span>    next-file <span class="Special">&lt;-</span> add next-file,<span class="Constant"> 1</span>
-<span id="L45" class="LineNr">45 </span>    <span class="muControl">loop</span>
+<span id="L33" class="LineNr">33 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal next-file, n
+<span id="L34" class="LineNr">34 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L35" class="LineNr">35 </span>  <span class="Conceal">¦</span> curr:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> merge next-rank, next-file
+<span id="L36" class="LineNr">36 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L37" class="LineNr">37 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr-conflicts?:bool <span class="Special">&lt;-</span> <a href='nqueens.mu.html#L49'>conflict?</a> curr, queens
+<span id="L38" class="LineNr">38 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-if</span> curr-conflicts?
+<span id="L39" class="LineNr">39 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> queens:&amp;:list:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> push curr, queens
+<span id="L40" class="LineNr">40 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> sub-result:num <span class="Special">&lt;-</span> <a href='nqueens.mu.html#L11'>nqueens</a> n, queens
+<span id="L41" class="LineNr">41 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> result <span class="Special">&lt;-</span> add result, sub-result
+<span id="L42" class="LineNr">42 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> queens <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> queens
+<span id="L43" class="LineNr">43 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L44" class="LineNr">44 </span>  <span class="Conceal">¦</span> next-file <span class="Special">&lt;-</span> add next-file,<span class="Constant"> 1</span>
+<span id="L45" class="LineNr">45 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L46" class="LineNr">46 </span>  <span class="Delimiter">}</span>
 <span id="L47" class="LineNr">47 </span>]
 <span id="L48" class="LineNr">48 </span>
@@ -119,13 +120,13 @@ if ('onhashchange' in window) {
 <span id="L60" class="LineNr">60 </span>  <span class="Constant">load-ingredients</span>
 <span id="L61" class="LineNr">61 </span>  curr-file:num <span class="Special">&lt;-</span> get curr, <span class="Constant">file:offset</span>
 <span id="L62" class="LineNr">62 </span>  <span class="Delimiter">{</span>
-<span id="L63" class="LineNr">63 </span>    <span class="muControl">break-unless</span> queens
-<span id="L64" class="LineNr">64 </span>    q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> first queens
-<span id="L65" class="LineNr">65 </span>    qfile:num <span class="Special">&lt;-</span> get q, <span class="Constant">file:offset</span>
-<span id="L66" class="LineNr">66 </span>    file-match?:bool <span class="Special">&lt;-</span> equal curr-file, qfile
-<span id="L67" class="LineNr">67 </span>    <span class="muControl">return-if</span> file-match?, <span class="Constant">1/conflict-found</span>
-<span id="L68" class="LineNr">68 </span>    queens <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> queens
-<span id="L69" class="LineNr">69 </span>    <span class="muControl">loop</span>
+<span id="L63" class="LineNr">63 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens
+<span id="L64" class="LineNr">64 </span>  <span class="Conceal">¦</span> q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> first queens
+<span id="L65" class="LineNr">65 </span>  <span class="Conceal">¦</span> qfile:num <span class="Special">&lt;-</span> get q, <span class="Constant">file:offset</span>
+<span id="L66" class="LineNr">66 </span>  <span class="Conceal">¦</span> file-match?:bool <span class="Special">&lt;-</span> equal curr-file, qfile
+<span id="L67" class="LineNr">67 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> file-match?, <span class="Constant">1/conflict-found</span>
+<span id="L68" class="LineNr">68 </span>  <span class="Conceal">¦</span> queens <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> queens
+<span id="L69" class="LineNr">69 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L70" class="LineNr">70 </span>  <span class="Delimiter">}</span>
 <span id="L71" class="LineNr">71 </span>  <span class="muControl">return</span> <span class="Constant">0/no-conflict-found</span>
 <span id="L72" class="LineNr">72 </span>]
@@ -136,18 +137,18 @@ if ('onhashchange' in window) {
 <span id="L77" class="LineNr">77 </span>  curr-rank:num <span class="Special">&lt;-</span> get curr, <span class="Constant">rank:offset</span>
 <span id="L78" class="LineNr">78 </span>  curr-file:num <span class="Special">&lt;-</span> get curr, <span class="Constant">file:offset</span>
 <span id="L79" class="LineNr">79 </span>  <span class="Delimiter">{</span>
-<span id="L80" class="LineNr">80 </span>    <span class="muControl">break-unless</span> queens
-<span id="L81" class="LineNr">81 </span>    q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> first queens
-<span id="L82" class="LineNr">82 </span>    qrank:num <span class="Special">&lt;-</span> get q, <span class="Constant">rank:offset</span>
-<span id="L83" class="LineNr">83 </span>    qfile:num <span class="Special">&lt;-</span> get q, <span class="Constant">file:offset</span>
-<span id="L84" class="LineNr">84 </span>    rank-delta:num <span class="Special">&lt;-</span> subtract qrank, curr-rank
-<span id="L85" class="LineNr">85 </span>    file-delta:num <span class="Special">&lt;-</span> subtract qfile, curr-file
-<span id="L86" class="LineNr">86 </span>    rank-delta <span class="Special">&lt;-</span> <a href='070table.mu.html#L103'>abs</a> rank-delta
-<span id="L87" class="LineNr">87 </span>    file-delta <span class="Special">&lt;-</span> <a href='070table.mu.html#L103'>abs</a> file-delta
-<span id="L88" class="LineNr">88 </span>    diagonal-match?:bool <span class="Special">&lt;-</span> equal rank-delta, file-delta
-<span id="L89" class="LineNr">89 </span>    <span class="muControl">return-if</span> diagonal-match?, <span class="Constant">1/conflict-found</span>
-<span id="L90" class="LineNr">90 </span>    queens <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> queens
-<span id="L91" class="LineNr">91 </span>    <span class="muControl">loop</span>
+<span id="L80" class="LineNr">80 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> queens
+<span id="L81" class="LineNr">81 </span>  <span class="Conceal">¦</span> q:<a href='nqueens.mu.html#L6'>square</a> <span class="Special">&lt;-</span> first queens
+<span id="L82" class="LineNr">82 </span>  <span class="Conceal">¦</span> qrank:num <span class="Special">&lt;-</span> get q, <span class="Constant">rank:offset</span>
+<span id="L83" class="LineNr">83 </span>  <span class="Conceal">¦</span> qfile:num <span class="Special">&lt;-</span> get q, <span class="Constant">file:offset</span>
+<span id="L84" class="LineNr">84 </span>  <span class="Conceal">¦</span> rank-delta:num <span class="Special">&lt;-</span> subtract qrank, curr-rank
+<span id="L85" class="LineNr">85 </span>  <span class="Conceal">¦</span> file-delta:num <span class="Special">&lt;-</span> subtract qfile, curr-file
+<span id="L86" class="LineNr">86 </span>  <span class="Conceal">¦</span> rank-delta <span class="Special">&lt;-</span> <a href='070table.mu.html#L103'>abs</a> rank-delta
+<span id="L87" class="LineNr">87 </span>  <span class="Conceal">¦</span> file-delta <span class="Special">&lt;-</span> <a href='070table.mu.html#L103'>abs</a> file-delta
+<span id="L88" class="LineNr">88 </span>  <span class="Conceal">¦</span> diagonal-match?:bool <span class="Special">&lt;-</span> equal rank-delta, file-delta
+<span id="L89" class="LineNr">89 </span>  <span class="Conceal">¦</span> <span class="muControl">return-if</span> diagonal-match?, <span class="Constant">1/conflict-found</span>
+<span id="L90" class="LineNr">90 </span>  <span class="Conceal">¦</span> queens <span class="Special">&lt;-</span> <a href='064list.mu.html#L25'>rest</a> queens
+<span id="L91" class="LineNr">91 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
 <span id="L92" class="LineNr">92 </span>  <span class="Delimiter">}</span>
 <span id="L93" class="LineNr">93 </span>  <span class="muControl">return</span> <span class="Constant">0/no-conflict-found</span>
 <span id="L94" class="LineNr">94 </span>]
diff --git a/html/real-files.mu.html b/html/real-files.mu.html
index f3edc213..3f4ca3f7 100644
--- a/html/real-files.mu.html
+++ b/html/real-files.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/screen.mu.html b/html/screen.mu.html
index ec6d0a4d..6bcadc01 100644
--- a/html/screen.mu.html
+++ b/html/screen.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/static-dispatch.mu.html b/html/static-dispatch.mu.html
index 4012290d..7efbdaeb 100644
--- a/html/static-dispatch.mu.html
+++ b/html/static-dispatch.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
 .Comment { color: #9090ff; }
-.muRecipe { color: #ff8700; }
 -->
 </style>
 
diff --git a/html/tangle.mu.html b/html/tangle.mu.html
index 3a24545b..2a3f057f 100644
--- a/html/tangle.mu.html
+++ b/html/tangle.mu.html
@@ -15,13 +15,14 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
+.Conceal { color: #4e4e4e; }
 .Delimiter { color: #800080; }
-.muControl { color: #c0a020; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
+.muControl { color: #c0a020; }
 -->
 </style>
 
@@ -68,7 +69,7 @@ if ('onhashchange' in window) {
 <span id="L10" class="LineNr">10 </span>  <span class="Constant">local-scope</span>
 <span id="L11" class="LineNr">11 </span>  <span class="Constant">load-ingredients</span>
 <span id="L12" class="LineNr">12 </span>  <span class="Delimiter">{</span>
-<span id="L13" class="LineNr">13 </span><span class="Constant">    <a href='tangle.mu.html#L13'>&lt;base-case&gt;</a></span>
+<span id="L13" class="LineNr">13 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='tangle.mu.html#L13'>&lt;base-case&gt;</a></span>
 <span id="L14" class="LineNr">14 </span>  <span class="Delimiter">}</span>
 <span id="L15" class="LineNr">15 </span><span class="Constant">  <a href='tangle.mu.html#L15'>&lt;recursive-case&gt;</a></span>
 <span id="L16" class="LineNr">16 </span>]
diff --git a/html/x.mu.html b/html/x.mu.html
index a49fd366..27d98acc 100644
--- a/html/x.mu.html
+++ b/html/x.mu.html
@@ -15,11 +15,11 @@ body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color
 a { text-decoration: none; }
 a:hover { text-decoration: underline; }
 * { font-size: 12pt; font-size: 1em; }
+.muRecipe { color: #ff8700; }
 .Special { color: #c00000; }
 .Comment { color: #9090ff; }
 .Constant { color: #00a0a0; }
 .LineNr { color: #444444; }
-.muRecipe { color: #ff8700; }
 -->
 </style>