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authorKartik K. Agaram <vc@akkartik.com>2017-05-06 15:03:13 -0700
committerKartik K. Agaram <vc@akkartik.com>2017-05-06 15:03:13 -0700
commit996ce5f101e597cf70bda0864f964b356a1005a3 (patch)
tree0b5437e561ac14ad27358401820fc5cd9b3e5193
parentdc0e767cf5130461a6aa58774d1016ec3934396b (diff)
downloadmu-996ce5f101e597cf70bda0864f964b356a1005a3.tar.gz
3845
-rw-r--r--html/013update_operation.cc.html2
-rw-r--r--html/020run.cc.html6
-rw-r--r--html/022arithmetic.cc.html6
-rw-r--r--html/028call_return.cc.html6
-rw-r--r--html/030container.cc.html8
-rw-r--r--html/032array.cc.html10
-rw-r--r--html/033exclusive_container.cc.html2
-rw-r--r--html/035lookup.cc.html2
-rw-r--r--html/036refcount.cc.html4
-rw-r--r--html/042name.cc.html4
-rw-r--r--html/043space.cc.html4
-rw-r--r--html/054static_dispatch.cc.html4
-rw-r--r--html/056shape_shifting_recipe.cc.html4
-rw-r--r--html/073wait.cc.html6
-rw-r--r--html/080display.cc.html847
-rw-r--r--html/081print.mu.html220
-rw-r--r--html/084console.mu.html13
-rw-r--r--html/edit/004-programming-environment.mu.html961
-rw-r--r--html/edit/005-sandbox.mu.html672
-rw-r--r--html/edit/006-sandbox-copy.mu.html4
-rw-r--r--html/edit/007-sandbox-delete.mu.html12
-rw-r--r--html/edit/008-sandbox-edit.mu.html8
-rw-r--r--html/edit/009-sandbox-test.mu.html4
-rw-r--r--html/edit/010-sandbox-trace.mu.html4
-rw-r--r--html/edit/011-errors.mu.html8
25 files changed, 1364 insertions, 1457 deletions
diff --git a/html/013update_operation.cc.html b/html/013update_operation.cc.html
index 437ffbd7..9852aecb 100644
--- a/html/013update_operation.cc.html
+++ b/html/013update_operation.cc.html
@@ -77,7 +77,7 @@ if ('onhashchange' in window) {
 <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> 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="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> 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="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>
diff --git a/html/020run.cc.html b/html/020run.cc.html
index 716821b7..7ea04137 100644
--- a/html/020run.cc.html
+++ b/html/020run.cc.html
@@ -161,7 +161,7 @@ if ('onhashchange' in window) {
 <span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Comment">//: used by a later layer</span>
 <span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> Writing_products_of_instruction = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L96" class="LineNr"> 96 </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="L97" class="LineNr"> 97 </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 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="L97" class="LineNr"> 97 </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 in '&quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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="Delimiter">}</span>
 <span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
 <span id="L100" class="LineNr">100 </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>
@@ -388,11 +388,11 @@ if ('onhashchange' in window) {
 <span id="L321" class="LineNr">321 </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="L322" class="LineNr">322 </span>  <span class="Comment">// End Preprocess write_memory(x, data)</span>
 <span id="L323" class="LineNr">323 </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="L324" class="LineNr">324 </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="L324" class="LineNr">324 </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; current_instruction<span 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="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</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>size_mismatch<span class="Delimiter">(</span>x<span class="Delimiter">,</span> data<span class="Delimiter">))</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>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="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>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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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">return</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="Comment">// End write_memory(x) Special-cases</span>
diff --git a/html/022arithmetic.cc.html b/html/022arithmetic.cc.html
index a447db0d..96df7af8 100644
--- a/html/022arithmetic.cc.html
+++ b/html/022arithmetic.cc.html
@@ -337,7 +337,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
@@ -419,7 +419,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span 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="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>
@@ -490,7 +490,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span 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="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>
diff --git a/html/028call_return.cc.html b/html/028call_return.cc.html
index d6353a9a..cef3e25c 100644
--- a/html/028call_return.cc.html
+++ b/html/028call_return.cc.html
@@ -156,16 +156,16 @@ if ('onhashchange' in window) {
 <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="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; return_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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="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; caller_instruction<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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="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; caller_instruction<span class="Delimiter">.</span>original_string &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>
diff --git a/html/030container.cc.html b/html/030container.cc.html
index 74f18505..faf36aab 100644
--- a/html/030container.cc.html
+++ b/html/030container.cc.html
@@ -245,9 +245,9 @@ if ('onhashchange' in window) {
 <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="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>+inst<span class="Delimiter">.</span>original_string+<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="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>+inst<span class="Delimiter">.</span>original_string+<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>
@@ -474,7 +474,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
@@ -630,7 +630,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
diff --git a/html/032array.cc.html b/html/032array.cc.html
index 11582655..317ec711 100644
--- a/html/032array.cc.html
+++ b/html/032array.cc.html
@@ -407,14 +407,14 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
@@ -597,14 +597,14 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
@@ -695,7 +695,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
diff --git a/html/033exclusive_container.cc.html b/html/033exclusive_container.cc.html
index bd69c42b..442293a6 100644
--- a/html/033exclusive_container.cc.html
+++ b/html/033exclusive_container.cc.html
@@ -216,7 +216,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
diff --git a/html/035lookup.cc.html b/html/035lookup.cc.html
index 3ce352c8..20c3031d 100644
--- a/html/035lookup.cc.html
+++ b/html/035lookup.cc.html
@@ -173,7 +173,7 @@ if ('onhashchange' in window) {
 <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="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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
diff --git a/html/036refcount.cc.html b/html/036refcount.cc.html
index b8bbcb65..d16f054c 100644
--- a/html/036refcount.cc.html
+++ b/html/036refcount.cc.html
@@ -382,9 +382,9 @@ if ('onhashchange' in window) {
 <span id="L317" class="LineNr"> 317 </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="L318" class="LineNr"> 318 </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="L319" class="LineNr"> 319 </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="L320" class="LineNr"> 320 </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="L320" class="LineNr"> 320 </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>+inst<span class="Delimiter">.</span>original_string+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
 <span id="L321" class="LineNr"> 321 </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="L322" class="LineNr"> 322 </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="L322" class="LineNr"> 322 </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>+inst<span class="Delimiter">.</span>original_string+<span class="Constant">&quot;'&quot;</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="Delimiter">}</span>
 <span id="L325" class="LineNr"> 325 </span>
diff --git a/html/042name.cc.html b/html/042name.cc.html
index 3cbcfc56..91ce16e3 100644
--- a/html/042name.cc.html
+++ b/html/042name.cc.html
@@ -120,7 +120,7 @@ if ('onhashchange' in window) {
 <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="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; inst<span class="Delimiter">.</span>original_string &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>
@@ -297,7 +297,7 @@ 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>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span 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="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; inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
diff --git a/html/043space.cc.html b/html/043space.cc.html
index 1de8212b..6d63636a 100644
--- a/html/043space.cc.html
+++ b/html/043space.cc.html
@@ -128,7 +128,7 @@ 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>  <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="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; current_instruction<span class="Delimiter">().</span>original_string &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>
@@ -377,7 +377,7 @@ if ('onhashchange' in window) {
 <span id="L311" class="LineNr">311 </span>
 <span id="L312" class="LineNr">312 </span><span class="Normal">void</span> <a href='043space.cc.html#L312'>rewrite_default_space_instruction</a><span class="Delimiter">(</span>instruction&amp; curr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L313" class="LineNr">313 </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="L314" class="LineNr">314 </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="L314" class="LineNr">314 </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>original_string &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="L315" class="LineNr">315 </span>  curr<span class="Delimiter">.</span>name = <span class="Constant">&quot;new&quot;</span><span class="Delimiter">;</span>
 <span id="L316" class="LineNr">316 </span>  <span class="Constant">curr.ingredients.push_back(reagent(&quot;location:type</span><span class="Constant">&quot;));</span>
 <span id="L317" class="LineNr">317 </span>  <span class="Constant">curr.ingredients.push_back(reagent(&quot;number-of-locals:literal</span><span class="Constant">&quot;));</span>
diff --git a/html/054static_dispatch.cc.html b/html/054static_dispatch.cc.html
index 1f85937b..14aa8e0b 100644
--- a/html/054static_dispatch.cc.html
+++ b/html/054static_dispatch.cc.html
@@ -280,9 +280,9 @@ if ('onhashchange' in window) {
 <span id="L215" class="LineNr">215 </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="L216" class="LineNr">216 </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="L217" class="LineNr">217 </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="L218" class="LineNr">218 </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="L218" class="LineNr">218 </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; specializer_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="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span>
-<span id="L220" class="LineNr">220 </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="L220" class="LineNr">220 </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; specializer_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
 <span id="L221" class="LineNr">221 </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="L222" class="LineNr">222 </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="L223" class="LineNr">223 </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>
diff --git a/html/056shape_shifting_recipe.cc.html b/html/056shape_shifting_recipe.cc.html
index 2d01441b..06c28b2b 100644
--- a/html/056shape_shifting_recipe.cc.html
+++ b/html/056shape_shifting_recipe.cc.html
@@ -383,7 +383,7 @@ if ('onhashchange' in window) {
 <span id="L316" class="LineNr"> 316 </span>  <span class="Conceal">¦</span> <span class="Comment">// probably a bug in mu</span>
 <span id="L317" class="LineNr"> 317 </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="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>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="L319" class="LineNr"> 319 </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="L319" class="LineNr"> 319 </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; call_instruction<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;')</span><span class="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">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>!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>
@@ -405,7 +405,7 @@ if ('onhashchange' in window) {
 <span id="L338" class="LineNr"> 338 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L339" class="LineNr"> 339 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">else</span> <span class="Delimiter">{</span>
 <span id="L340" class="LineNr"> 340 </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="L341" class="LineNr"> 341 </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="L341" class="LineNr"> 341 </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; call_instruction<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> *error = <span class="Constant">true</span><span class="Delimiter">;</span>
 <span id="L343" class="LineNr"> 343 </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="L344" class="LineNr"> 344 </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>
diff --git a/html/073wait.cc.html b/html/073wait.cc.html
index 713aa669..da8e2a9e 100644
--- a/html/073wait.cc.html
+++ b/html/073wait.cc.html
@@ -268,7 +268,7 @@ 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>  <span class="Conceal">¦</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="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; current_instruction<span class="Delimiter">().</span>original_string &lt;&lt; <span class="Constant">&quot;'</span><span class="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>
@@ -402,7 +402,7 @@ if ('onhashchange' in window) {
 <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>  <span class="Conceal">¦</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="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; current_instruction<span 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="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>
@@ -564,7 +564,7 @@ if ('onhashchange' in window) {
 <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>  <span class="Conceal">¦</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="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; current_instruction<span 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="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>
diff --git a/html/080display.cc.html b/html/080display.cc.html
index 8419558a..975f8fa2 100644
--- a/html/080display.cc.html
+++ b/html/080display.cc.html
@@ -121,444 +121,415 @@ if ('onhashchange' in window) {
 <span id="L59" class="LineNr"> 59 </span><span class="Delimiter">}</span>
 <span id="L60" class="LineNr"> 60 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 <span id="L61" class="LineNr"> 61 </span><span class="Normal">case</span> CLOSE_CONSOLE: <span class="Delimiter">{</span>
-<span id="L62" class="LineNr"> 62 </span>  tb_shutdown<span class="Delimiter">();</span>
-<span id="L63" class="LineNr"> 63 </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 id="L66" class="LineNr"> 66 </span><span class="Delimiter">:(before &quot;End Teardown&quot;)</span>
-<span id="L67" class="LineNr"> 67 </span>tb_shutdown<span class="Delimiter">();</span>
-<span id="L68" class="LineNr"> 68 </span>
-<span id="L69" class="LineNr"> 69 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L70" class="LineNr"> 70 </span>CLEAR_DISPLAY<span class="Delimiter">,</span>
-<span id="L71" class="LineNr"> 71 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L72" class="LineNr"> 72 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;clear-display&quot;</span><span class="Delimiter">,</span> CLEAR_DISPLAY<span class="Delimiter">);</span>
-<span id="L73" class="LineNr"> 73 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L74" class="LineNr"> 74 </span><span class="Normal">case</span> CLEAR_DISPLAY: <span class="Delimiter">{</span>
-<span id="L75" class="LineNr"> 75 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L78" class="LineNr"> 78 </span><span class="Normal">case</span> CLEAR_DISPLAY: <span class="Delimiter">{</span>
-<span id="L79" class="LineNr"> 79 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L80" class="LineNr"> 80 </span>  tb_clear<span class="Delimiter">();</span>
-<span id="L81" class="LineNr"> 81 </span>  Display_row = Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L82" class="LineNr"> 82 </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 id="L85" class="LineNr"> 85 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L86" class="LineNr"> 86 </span>CLEAR_LINE_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L87" class="LineNr"> 87 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L88" class="LineNr"> 88 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;clear-line-on-display&quot;</span><span class="Delimiter">,</span> CLEAR_LINE_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L89" class="LineNr"> 89 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L90" class="LineNr"> 90 </span><span class="Normal">case</span> CLEAR_LINE_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L91" class="LineNr"> 91 </span>  <span class="Identifier">break</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">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L94" class="LineNr"> 94 </span><span class="Normal">case</span> CLEAR_LINE_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L95" class="LineNr"> 95 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L96" class="LineNr"> 96 </span>  <span class="Normal">int</span> width = tb_width<span class="Delimiter">();</span>
-<span id="L97" class="LineNr"> 97 </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="L98" class="LineNr"> 98 </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="L99" class="LineNr"> 99 </span>  <span class="Delimiter">}</span>
-<span id="L100" class="LineNr">100 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L101" class="LineNr">101 </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 id="L104" class="LineNr">104 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L105" class="LineNr">105 </span>PRINT_CHARACTER_TO_DISPLAY<span class="Delimiter">,</span>
-<span id="L106" class="LineNr">106 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L107" class="LineNr">107 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;print-character-to-display&quot;</span><span class="Delimiter">,</span> PRINT_CHARACTER_TO_DISPLAY<span class="Delimiter">);</span>
-<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> PRINT_CHARACTER_TO_DISPLAY: <span class="Delimiter">{</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> <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;'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="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_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="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;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="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><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="L119" class="LineNr">119 </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="L120" class="LineNr">120 </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="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</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="Delimiter">}</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>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="L125" class="LineNr">125 </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="L126" class="LineNr">126 </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="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</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="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><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L133" class="LineNr">133 </span><span class="Normal">case</span> PRINT_CHARACTER_TO_DISPLAY: <span class="Delimiter">{</span>
-<span id="L134" class="LineNr">134 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L135" class="LineNr">135 </span>  <span class="Normal">int</span> h=tb_height<span class="Delimiter">(),</span> w=tb_width<span class="Delimiter">();</span>
-<span id="L136" class="LineNr">136 </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="L137" class="LineNr">137 </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="L138" class="LineNr">138 </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="L139" class="LineNr">139 </span>  <span class="Normal">int</span> color = TB_WHITE<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>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L141" class="LineNr">141 </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="L142" class="LineNr">142 </span>  <span class="Delimiter">}</span>
-<span id="L143" class="LineNr">143 </span>  <span class="Normal">int</span> bg_color = TB_BLACK<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>ingredients<span class="Delimiter">)</span> &gt; <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L145" class="LineNr">145 </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="L146" class="LineNr">146 </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="L147" class="LineNr">147 </span>  <span class="Delimiter">}</span>
-<span id="L148" class="LineNr">148 </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="L149" class="LineNr">149 </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="L150" class="LineNr">150 </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="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++Display_row<span class="Delimiter">;</span>
-<span id="L153" class="LineNr">153 </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="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <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">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\b'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L158" class="LineNr">158 </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="L159" class="LineNr">159 </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="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Display_column<span class="Delimiter">;</span>
-<span id="L161" class="LineNr">161 </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="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</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>  <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="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> ++Display_column<span class="Delimiter">;</span>
-<span id="L167" class="LineNr">167 </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="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>
-<span id="L171" class="LineNr">171 </span>
-<span id="L172" class="LineNr">172 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L173" class="LineNr">173 </span>CURSOR_POSITION_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L174" class="LineNr">174 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L175" class="LineNr">175 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;cursor-position-on-display&quot;</span><span class="Delimiter">,</span> CURSOR_POSITION_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L176" class="LineNr">176 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L177" class="LineNr">177 </span><span class="Normal">case</span> CURSOR_POSITION_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L178" class="LineNr">178 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L181" class="LineNr">181 </span><span class="Normal">case</span> CURSOR_POSITION_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L182" class="LineNr">182 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L183" class="LineNr">183 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
-<span id="L184" class="LineNr">184 </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>Display_row<span class="Delimiter">);</span>
-<span id="L185" class="LineNr">185 </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>Display_column<span class="Delimiter">);</span>
-<span id="L186" class="LineNr">186 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L187" class="LineNr">187 </span><span class="Delimiter">}</span>
-<span id="L188" class="LineNr">188 </span>
-<span id="L189" class="LineNr">189 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L190" class="LineNr">190 </span>MOVE_CURSOR_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L191" class="LineNr">191 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L192" class="LineNr">192 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L193" class="LineNr">193 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L194" class="LineNr">194 </span><span class="Normal">case</span> MOVE_CURSOR_ON_DISPLAY: <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#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="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span 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="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L198" class="LineNr">198 </span>  <span class="Delimiter">}</span>
-<span id="L199" class="LineNr">199 </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="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;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="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">1</span><span class="Delimiter">)))</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;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="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="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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L210" class="LineNr">210 </span><span class="Normal">case</span> MOVE_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L211" class="LineNr">211 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L212" class="LineNr">212 </span>  Display_row = 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="L213" class="LineNr">213 </span>  Display_column = 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="L214" class="LineNr">214 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<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>
-<span id="L217" class="LineNr">217 </span>
-<span id="L218" class="LineNr">218 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L219" class="LineNr">219 </span>MOVE_CURSOR_DOWN_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L220" class="LineNr">220 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L221" class="LineNr">221 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-down-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_DOWN_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L222" class="LineNr">222 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L223" class="LineNr">223 </span><span class="Normal">case</span> MOVE_CURSOR_DOWN_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L224" class="LineNr">224 </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">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L227" class="LineNr">227 </span><span class="Normal">case</span> MOVE_CURSOR_DOWN_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L228" class="LineNr">228 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L229" class="LineNr">229 </span>  <span class="Normal">int</span> h=tb_height<span class="Delimiter">();</span>
-<span id="L230" class="LineNr">230 </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="L231" class="LineNr">231 </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="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> ++Display_row<span class="Delimiter">;</span>
-<span id="L233" class="LineNr">233 </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="L234" class="LineNr">234 </span>  <span class="Delimiter">}</span>
-<span id="L235" class="LineNr">235 </span>  <span class="Identifier">break</span><span class="Delimiter">;</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="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L239" class="LineNr">239 </span>MOVE_CURSOR_UP_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L240" class="LineNr">240 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L241" class="LineNr">241 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-up-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_UP_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L242" class="LineNr">242 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L243" class="LineNr">243 </span><span class="Normal">case</span> MOVE_CURSOR_UP_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L244" class="LineNr">244 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L245" class="LineNr">245 </span><span class="Delimiter">}</span>
-<span id="L246" class="LineNr">246 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L247" class="LineNr">247 </span><span class="Normal">case</span> MOVE_CURSOR_UP_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L248" class="LineNr">248 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L249" class="LineNr">249 </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="L250" class="LineNr">250 </span>  <span class="Conceal">¦</span> --Display_row<span class="Delimiter">;</span>
-<span id="L251" class="LineNr">251 </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="L252" class="LineNr">252 </span>  <span class="Delimiter">}</span>
-<span id="L253" class="LineNr">253 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L254" class="LineNr">254 </span><span class="Delimiter">}</span>
-<span id="L255" class="LineNr">255 </span>
-<span id="L256" class="LineNr">256 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L257" class="LineNr">257 </span>MOVE_CURSOR_RIGHT_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L258" class="LineNr">258 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L259" class="LineNr">259 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-right-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_RIGHT_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L260" class="LineNr">260 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L261" class="LineNr">261 </span><span class="Normal">case</span> MOVE_CURSOR_RIGHT_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L262" class="LineNr">262 </span>  <span class="Identifier">break</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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L265" class="LineNr">265 </span><span class="Normal">case</span> MOVE_CURSOR_RIGHT_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L266" class="LineNr">266 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L267" class="LineNr">267 </span>  <span class="Normal">int</span> w=tb_width<span class="Delimiter">();</span>
-<span id="L268" class="LineNr">268 </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="L269" class="LineNr">269 </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="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span> ++Display_column<span class="Delimiter">;</span>
-<span id="L271" class="LineNr">271 </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="L272" class="LineNr">272 </span>  <span class="Delimiter">}</span>
-<span id="L273" class="LineNr">273 </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 id="L276" class="LineNr">276 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L277" class="LineNr">277 </span>MOVE_CURSOR_LEFT_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L278" class="LineNr">278 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L279" class="LineNr">279 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-left-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_LEFT_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L280" class="LineNr">280 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L281" class="LineNr">281 </span><span class="Normal">case</span> MOVE_CURSOR_LEFT_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L282" class="LineNr">282 </span>  <span class="Identifier">break</span><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">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L285" class="LineNr">285 </span><span class="Normal">case</span> MOVE_CURSOR_LEFT_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L286" class="LineNr">286 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L287" class="LineNr">287 </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="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> --Display_column<span class="Delimiter">;</span>
-<span id="L289" class="LineNr">289 </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="L290" class="LineNr">290 </span>  <span class="Delimiter">}</span>
-<span id="L291" class="LineNr">291 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L292" class="LineNr">292 </span><span class="Delimiter">}</span>
-<span id="L293" class="LineNr">293 </span>
-<span id="L294" class="LineNr">294 </span><span class="Comment">//: as a convenience, make $print mostly work in console mode</span>
-<span id="L295" class="LineNr">295 </span><span class="Delimiter">:(before &quot;End $print 10/newline Special-cases&quot;)</span>
-<span id="L296" class="LineNr">296 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>tb_is_active<span class="Delimiter">())</span> <span class="Delimiter">{</span>
-<span id="L297" class="LineNr">297 </span>  <a href='080display.cc.html#L300'>move_cursor_to_start_of_next_line_on_display</a><span class="Delimiter">();</span>
-<span id="L298" class="LineNr">298 </span><span class="Delimiter">}</span>
-<span id="L299" class="LineNr">299 </span><span class="Delimiter">:(code)</span>
-<span id="L300" class="LineNr">300 </span><span class="Normal">void</span> <a href='080display.cc.html#L300'>move_cursor_to_start_of_next_line_on_display</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L301" class="LineNr">301 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> ++Display_row<span class="Delimiter">;</span>
-<span id="L302" class="LineNr">302 </span>  <span class="Normal">else</span> Display_row = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L303" class="LineNr">303 </span>  Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L304" class="LineNr">304 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
-<span id="L305" class="LineNr">305 </span><span class="Delimiter">}</span>
-<span id="L306" class="LineNr">306 </span>
-<span id="L307" class="LineNr">307 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L308" class="LineNr">308 </span>DISPLAY_WIDTH<span class="Delimiter">,</span>
-<span id="L309" class="LineNr">309 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L310" class="LineNr">310 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;display-width&quot;</span><span class="Delimiter">,</span> DISPLAY_WIDTH<span class="Delimiter">);</span>
-<span id="L311" class="LineNr">311 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L312" class="LineNr">312 </span><span class="Normal">case</span> DISPLAY_WIDTH: <span class="Delimiter">{</span>
-<span id="L313" class="LineNr">313 </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><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L316" class="LineNr">316 </span><span class="Normal">case</span> DISPLAY_WIDTH: <span class="Delimiter">{</span>
-<span id="L317" class="LineNr">317 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L318" class="LineNr">318 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L319" class="LineNr">319 </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>tb_width<span class="Delimiter">());</span>
-<span id="L320" class="LineNr">320 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L321" class="LineNr">321 </span><span class="Delimiter">}</span>
-<span id="L322" class="LineNr">322 </span>
-<span id="L323" class="LineNr">323 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L324" class="LineNr">324 </span>DISPLAY_HEIGHT<span class="Delimiter">,</span>
-<span id="L325" class="LineNr">325 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L326" class="LineNr">326 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;display-height&quot;</span><span class="Delimiter">,</span> DISPLAY_HEIGHT<span class="Delimiter">);</span>
-<span id="L327" class="LineNr">327 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L328" class="LineNr">328 </span><span class="Normal">case</span> DISPLAY_HEIGHT: <span class="Delimiter">{</span>
-<span id="L329" class="LineNr">329 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L332" class="LineNr">332 </span><span class="Normal">case</span> DISPLAY_HEIGHT: <span class="Delimiter">{</span>
-<span id="L333" class="LineNr">333 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L334" class="LineNr">334 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L335" class="LineNr">335 </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>tb_height<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>
-<span id="L338" class="LineNr">338 </span>
-<span id="L339" class="LineNr">339 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L340" class="LineNr">340 </span>HIDE_CURSOR_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L341" class="LineNr">341 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L342" class="LineNr">342 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;hide-cursor-on-display&quot;</span><span class="Delimiter">,</span> HIDE_CURSOR_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L343" class="LineNr">343 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L344" class="LineNr">344 </span><span class="Normal">case</span> HIDE_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L345" class="LineNr">345 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L346" class="LineNr">346 </span><span class="Delimiter">}</span>
-<span id="L347" class="LineNr">347 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L348" class="LineNr">348 </span><span class="Normal">case</span> HIDE_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L349" class="LineNr">349 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L350" class="LineNr">350 </span>  tb_set_cursor<span class="Delimiter">(</span>TB_HIDE_CURSOR<span class="Delimiter">,</span> TB_HIDE_CURSOR<span class="Delimiter">);</span>
-<span id="L351" class="LineNr">351 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L352" class="LineNr">352 </span><span class="Delimiter">}</span>
-<span id="L353" class="LineNr">353 </span>
-<span id="L354" class="LineNr">354 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L355" class="LineNr">355 </span>SHOW_CURSOR_ON_DISPLAY<span class="Delimiter">,</span>
-<span id="L356" class="LineNr">356 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L357" class="LineNr">357 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;show-cursor-on-display&quot;</span><span class="Delimiter">,</span> SHOW_CURSOR_ON_DISPLAY<span class="Delimiter">);</span>
-<span id="L358" class="LineNr">358 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L359" class="LineNr">359 </span><span class="Normal">case</span> SHOW_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L360" class="LineNr">360 </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><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L363" class="LineNr">363 </span><span class="Normal">case</span> SHOW_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
-<span id="L364" class="LineNr">364 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L365" class="LineNr">365 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_row<span class="Delimiter">,</span> Display_column<span class="Delimiter">);</span>
-<span id="L366" class="LineNr">366 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L367" class="LineNr">367 </span><span class="Delimiter">}</span>
-<span id="L368" class="LineNr">368 </span>
-<span id="L369" class="LineNr">369 </span><span class="SalientComment">//:: Keyboard/mouse management</span>
-<span id="L370" class="LineNr">370 </span>
-<span id="L371" class="LineNr">371 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L372" class="LineNr">372 </span>WAIT_FOR_SOME_INTERACTION<span class="Delimiter">,</span>
-<span id="L373" class="LineNr">373 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L374" class="LineNr">374 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;wait-for-some-interaction&quot;</span><span class="Delimiter">,</span> WAIT_FOR_SOME_INTERACTION<span class="Delimiter">);</span>
-<span id="L375" class="LineNr">375 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L376" class="LineNr">376 </span><span class="Normal">case</span> WAIT_FOR_SOME_INTERACTION: <span class="Delimiter">{</span>
-<span id="L377" class="LineNr">377 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L380" class="LineNr">380 </span><span class="Normal">case</span> WAIT_FOR_SOME_INTERACTION: <span class="Delimiter">{</span>
-<span id="L381" class="LineNr">381 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L382" class="LineNr">382 </span>  tb_event event<span class="Delimiter">;</span>
-<span id="L383" class="LineNr">383 </span>  tb_poll_event<span class="Delimiter">(</span>&amp;event<span class="Delimiter">);</span>
-<span id="L384" class="LineNr">384 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L385" class="LineNr">385 </span><span class="Delimiter">}</span>
-<span id="L386" class="LineNr">386 </span>
-<span id="L387" class="LineNr">387 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L388" class="LineNr">388 </span>CHECK_FOR_INTERACTION<span class="Delimiter">,</span>
-<span id="L389" class="LineNr">389 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L390" class="LineNr">390 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;check-for-interaction&quot;</span><span class="Delimiter">,</span> CHECK_FOR_INTERACTION<span class="Delimiter">);</span>
-<span id="L391" class="LineNr">391 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L392" class="LineNr">392 </span><span class="Normal">case</span> CHECK_FOR_INTERACTION: <span class="Delimiter">{</span>
-<span id="L393" class="LineNr">393 </span>  <span class="Identifier">break</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">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L396" class="LineNr">396 </span><span class="Normal">case</span> CHECK_FOR_INTERACTION: <span class="Delimiter">{</span>
-<span id="L397" class="LineNr">397 </span>  <a href='080display.cc.html#L20'>CHECK_CONSOLE</a><span class="Delimiter">;</span>
-<span id="L398" class="LineNr">398 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// result and status</span>
-<span id="L399" class="LineNr">399 </span>  tb_event event<span class="Delimiter">;</span>
-<span id="L400" class="LineNr">400 </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="L401" class="LineNr">401 </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="L402" class="LineNr">402 </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="L403" class="LineNr">403 </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="L404" class="LineNr">404 </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="L405" class="LineNr">405 </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="L406" class="LineNr">406 </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="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L408" class="LineNr">408 </span>  <span class="Delimiter">}</span>
-<span id="L409" class="LineNr">409 </span>  <span class="Comment">// treat keys within ascii as unicode characters</span>
-<span id="L410" class="LineNr">410 </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="L411" class="LineNr">411 </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="L412" class="LineNr">412 </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="L413" class="LineNr">413 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_shutdown<span class="Delimiter">();</span>
-<span id="L414" class="LineNr">414 </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="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L416" class="LineNr">416 </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="L417" class="LineNr">417 </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="L418" class="LineNr">418 </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="L419" class="LineNr">419 </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="L420" class="LineNr">420 </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="L421" class="LineNr">421 </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="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L423" class="LineNr">423 </span>  <span class="Delimiter">}</span>
-<span id="L424" class="LineNr">424 </span>  <span class="Comment">// keys outside ascii aren't unicode characters but arbitrary termbox inventions</span>
-<span id="L425" class="LineNr">425 </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="L426" class="LineNr">426 </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="L427" class="LineNr">427 </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="L428" class="LineNr">428 </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="L429" class="LineNr">429 </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="L430" class="LineNr">430 </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="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>  <span class="Normal">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_MOUSE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L434" class="LineNr">434 </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="L435" class="LineNr">435 </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="L436" class="LineNr">436 </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="L437" class="LineNr">437 </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="L438" class="LineNr">438 </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="L439" class="LineNr">439 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><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">if</span> <span class="Delimiter">(</span>event_type == TB_EVENT_RESIZE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L442" class="LineNr">442 </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="L443" class="LineNr">443 </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="L444" class="LineNr">444 </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="L445" class="LineNr">445 </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="L446" class="LineNr">446 </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="L447" class="LineNr">447 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L448" class="LineNr">448 </span>  <span class="Delimiter">}</span>
-<span id="L449" class="LineNr">449 </span>  assert<span class="Delimiter">(</span>event_type == <span class="Constant">0</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><span class="Constant">0</span><span class="Delimiter">);</span>
-<span id="L451" class="LineNr">451 </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="L452" class="LineNr">452 </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="L453" class="LineNr">453 </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="L454" class="LineNr">454 </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="L455" class="LineNr">455 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L456" class="LineNr">456 </span><span class="Delimiter">}</span>
-<span id="L457" class="LineNr">457 </span>
-<span id="L458" class="LineNr">458 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L459" class="LineNr">459 </span>INTERACTIONS_LEFT<span class="Delimiter">,</span>
-<span id="L460" class="LineNr">460 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L461" class="LineNr">461 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;interactions-left?&quot;</span><span class="Delimiter">,</span> INTERACTIONS_LEFT<span class="Delimiter">);</span>
-<span id="L462" class="LineNr">462 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L463" class="LineNr">463 </span><span class="Normal">case</span> INTERACTIONS_LEFT: <span class="Delimiter">{</span>
-<span id="L464" class="LineNr">464 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L465" class="LineNr">465 </span><span class="Delimiter">}</span>
-<span id="L466" class="LineNr">466 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L467" class="LineNr">467 </span><span class="Normal">case</span> INTERACTIONS_LEFT: <span class="Delimiter">{</span>
-<span id="L468" class="LineNr">468 </span>  <a href='080display.cc.html#L20'>CHECK_CONSOLE</a><span class="Delimiter">;</span>
-<span id="L469" class="LineNr">469 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
-<span id="L470" class="LineNr">470 </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>tb_event_ready<span class="Delimiter">());</span>
-<span id="L471" class="LineNr">471 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L472" class="LineNr">472 </span><span class="Delimiter">}</span>
-<span id="L473" class="LineNr">473 </span>
-<span id="L474" class="LineNr">474 </span><span class="Comment">//: hack to make text-mode apps more responsive under Unix</span>
-<span id="L475" class="LineNr">475 </span>
-<span id="L476" class="LineNr">476 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
-<span id="L477" class="LineNr">477 </span>CLEAR_DISPLAY_FROM<span class="Delimiter">,</span>
-<span id="L478" class="LineNr">478 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-<span id="L479" class="LineNr">479 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;clear-display-from&quot;</span><span class="Delimiter">,</span> CLEAR_DISPLAY_FROM<span class="Delimiter">);</span>
-<span id="L480" class="LineNr">480 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
-<span id="L481" class="LineNr">481 </span><span class="Normal">case</span> CLEAR_DISPLAY_FROM: <span class="Delimiter">{</span>
-<span id="L482" class="LineNr">482 </span>  <span class="Identifier">break</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">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
-<span id="L485" class="LineNr">485 </span><span class="Normal">case</span> CLEAR_DISPLAY_FROM: <span class="Delimiter">{</span>
-<span id="L486" class="LineNr">486 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
-<span id="L487" class="LineNr">487 </span>  <span class="Comment">// todo: error checking</span>
-<span id="L488" class="LineNr">488 </span>  <span class="Normal">int</span> row = 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="L489" class="LineNr">489 </span>  <span class="Normal">int</span> column = 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="L490" class="LineNr">490 </span>  <span class="Normal">int</span> left = 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="L491" class="LineNr">491 </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="L492" class="LineNr">492 </span>  <span class="Normal">int</span> height=tb_height<span class="Delimiter">();</span>
-<span id="L493" class="LineNr">493 </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="L494" class="LineNr">494 </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="L495" class="LineNr">495 </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="L496" class="LineNr">496 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L497" class="LineNr">497 </span>  <span class="Delimiter">}</span>
-<span id="L498" class="LineNr">498 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
-<span id="L499" class="LineNr">499 </span><span class="Delimiter">}</span>
+<span id="L62" class="LineNr"> 62 </span>  tb_clear<span class="Delimiter">();</span>
+<span id="L63" class="LineNr"> 63 </span>  tb_shutdown<span class="Delimiter">();</span>
+<span id="L64" class="LineNr"> 64 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L65" class="LineNr"> 65 </span><span class="Delimiter">}</span>
+<span id="L66" class="LineNr"> 66 </span>
+<span id="L67" class="LineNr"> 67 </span><span class="Delimiter">:(before &quot;End Teardown&quot;)</span>
+<span id="L68" class="LineNr"> 68 </span>tb_shutdown<span class="Delimiter">();</span>
+<span id="L69" class="LineNr"> 69 </span>
+<span id="L70" class="LineNr"> 70 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L71" class="LineNr"> 71 </span>CLEAR_DISPLAY<span class="Delimiter">,</span>
+<span id="L72" class="LineNr"> 72 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L73" class="LineNr"> 73 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;clear-display&quot;</span><span class="Delimiter">,</span> CLEAR_DISPLAY<span class="Delimiter">);</span>
+<span id="L74" class="LineNr"> 74 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L75" class="LineNr"> 75 </span><span class="Normal">case</span> CLEAR_DISPLAY: <span class="Delimiter">{</span>
+<span id="L76" class="LineNr"> 76 </span>  <span class="Identifier">break</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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L79" class="LineNr"> 79 </span><span class="Normal">case</span> CLEAR_DISPLAY: <span class="Delimiter">{</span>
+<span id="L80" class="LineNr"> 80 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L81" class="LineNr"> 81 </span>  tb_clear<span class="Delimiter">();</span>
+<span id="L82" class="LineNr"> 82 </span>  Display_row = Display_column = <span class="Constant">0</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>
+<span id="L85" class="LineNr"> 85 </span>
+<span id="L86" class="LineNr"> 86 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L87" class="LineNr"> 87 </span>CLEAR_LINE_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L88" class="LineNr"> 88 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L89" class="LineNr"> 89 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;clear-line-on-display&quot;</span><span class="Delimiter">,</span> CLEAR_LINE_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L91" class="LineNr"> 91 </span><span class="Normal">case</span> CLEAR_LINE_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L92" class="LineNr"> 92 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L95" class="LineNr"> 95 </span><span class="Normal">case</span> CLEAR_LINE_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L96" class="LineNr"> 96 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L97" class="LineNr"> 97 </span>  <span class="Normal">int</span> width = tb_width<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> 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="L99" class="LineNr"> 99 </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="L100" class="LineNr">100 </span>  <span class="Delimiter">}</span>
+<span id="L101" class="LineNr">101 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L103" class="LineNr">103 </span><span class="Delimiter">}</span>
+<span id="L104" class="LineNr">104 </span>
+<span id="L105" class="LineNr">105 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L106" class="LineNr">106 </span>PRINT_CHARACTER_TO_DISPLAY<span class="Delimiter">,</span>
+<span id="L107" class="LineNr">107 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L108" class="LineNr">108 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;print-character-to-display&quot;</span><span class="Delimiter">,</span> PRINT_CHARACTER_TO_DISPLAY<span class="Delimiter">);</span>
+<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> PRINT_CHARACTER_TO_DISPLAY: <span class="Delimiter">{</span>
+<span id="L111" class="LineNr">111 </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="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;'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="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_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="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;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="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Delimiter">}</span>
+<span id="L119" class="LineNr">119 </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="L120" class="LineNr">120 </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="L121" class="LineNr">121 </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="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</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="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="L126" class="LineNr">126 </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="L127" class="LineNr">127 </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="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</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="Delimiter">}</span>
+<span id="L131" class="LineNr">131 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L134" class="LineNr">134 </span><span class="Normal">case</span> PRINT_CHARACTER_TO_DISPLAY: <span class="Delimiter">{</span>
+<span id="L135" class="LineNr">135 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Normal">int</span> h=tb_height<span class="Delimiter">(),</span> w=tb_width<span class="Delimiter">();</span>
+<span id="L137" class="LineNr">137 </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="L138" class="LineNr">138 </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="L139" class="LineNr">139 </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="L140" class="LineNr">140 </span>  <span class="Normal">int</span> color = TB_WHITE<span class="Delimiter">;</span>
+<span id="L141" class="LineNr">141 </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="L142" class="LineNr">142 </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="L143" class="LineNr">143 </span>  <span class="Delimiter">}</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Normal">int</span> bg_color = TB_BLACK<span class="Delimiter">;</span>
+<span id="L145" class="LineNr">145 </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="L146" class="LineNr">146 </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="L147" class="LineNr">147 </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="L148" class="LineNr">148 </span>  <span class="Delimiter">}</span>
+<span id="L149" class="LineNr">149 </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="L150" class="LineNr">150 </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="L151" class="LineNr">151 </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="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++Display_row<span class="Delimiter">;</span>
+<span id="L154" class="LineNr">154 </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="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="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Delimiter">}</span>
+<span id="L158" class="LineNr">158 </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="L159" class="LineNr">159 </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="L160" class="LineNr">160 </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="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> --Display_column<span class="Delimiter">;</span>
+<span id="L162" class="LineNr">162 </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="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</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>Display_column &lt; width-<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> ++Display_column<span class="Delimiter">;</span>
+<span id="L168" class="LineNr">168 </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="L169" class="LineNr">169 </span>  <span class="Delimiter">}</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="Delimiter">}</span>
+<span id="L172" class="LineNr">172 </span>
+<span id="L173" class="LineNr">173 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L174" class="LineNr">174 </span>CURSOR_POSITION_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L175" class="LineNr">175 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L176" class="LineNr">176 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;cursor-position-on-display&quot;</span><span class="Delimiter">,</span> CURSOR_POSITION_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L177" class="LineNr">177 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L178" class="LineNr">178 </span><span class="Normal">case</span> CURSOR_POSITION_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L179" class="LineNr">179 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L182" class="LineNr">182 </span><span class="Normal">case</span> CURSOR_POSITION_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L183" class="LineNr">183 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L184" class="LineNr">184 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>
+<span id="L185" class="LineNr">185 </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>Display_row<span class="Delimiter">);</span>
+<span id="L186" class="LineNr">186 </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>Display_column<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="L189" class="LineNr">189 </span>
+<span id="L190" class="LineNr">190 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L191" class="LineNr">191 </span>MOVE_CURSOR_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L192" class="LineNr">192 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L193" class="LineNr">193 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L194" class="LineNr">194 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L195" class="LineNr">195 </span><span class="Normal">case</span> MOVE_CURSOR_ON_DISPLAY: <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> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>get<span 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="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</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">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="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>get<span 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="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Delimiter">}</span>
+<span id="L204" class="LineNr">204 </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="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;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="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="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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L211" class="LineNr">211 </span><span class="Normal">case</span> MOVE_CURSOR_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L212" class="LineNr">212 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L213" class="LineNr">213 </span>  Display_row = 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>  Display_column = 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="L215" class="LineNr">215 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L216" class="LineNr">216 </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 id="L219" class="LineNr">219 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L220" class="LineNr">220 </span>MOVE_CURSOR_DOWN_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L221" class="LineNr">221 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L222" class="LineNr">222 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-down-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_DOWN_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L223" class="LineNr">223 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L224" class="LineNr">224 </span><span class="Normal">case</span> MOVE_CURSOR_DOWN_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L225" class="LineNr">225 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L226" class="LineNr">226 </span><span class="Delimiter">}</span>
+<span id="L227" class="LineNr">227 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L228" class="LineNr">228 </span><span class="Normal">case</span> MOVE_CURSOR_DOWN_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L229" class="LineNr">229 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L230" class="LineNr">230 </span>  <span class="Normal">int</span> h=tb_height<span class="Delimiter">();</span>
+<span id="L231" class="LineNr">231 </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="L232" class="LineNr">232 </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="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> ++Display_row<span class="Delimiter">;</span>
+<span id="L234" class="LineNr">234 </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="L235" class="LineNr">235 </span>  <span class="Delimiter">}</span>
+<span id="L236" class="LineNr">236 </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>
+<span id="L239" class="LineNr">239 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L240" class="LineNr">240 </span>MOVE_CURSOR_UP_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L241" class="LineNr">241 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L242" class="LineNr">242 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-up-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_UP_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L243" class="LineNr">243 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L244" class="LineNr">244 </span><span class="Normal">case</span> MOVE_CURSOR_UP_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L246" class="LineNr">246 </span><span class="Delimiter">}</span>
+<span id="L247" class="LineNr">247 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L248" class="LineNr">248 </span><span class="Normal">case</span> MOVE_CURSOR_UP_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L249" class="LineNr">249 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L250" class="LineNr">250 </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="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> --Display_row<span class="Delimiter">;</span>
+<span id="L252" class="LineNr">252 </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="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>
+<span id="L256" class="LineNr">256 </span>
+<span id="L257" class="LineNr">257 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L258" class="LineNr">258 </span>MOVE_CURSOR_RIGHT_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L259" class="LineNr">259 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L260" class="LineNr">260 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-right-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_RIGHT_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L261" class="LineNr">261 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L262" class="LineNr">262 </span><span class="Normal">case</span> MOVE_CURSOR_RIGHT_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Identifier">break</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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L266" class="LineNr">266 </span><span class="Normal">case</span> MOVE_CURSOR_RIGHT_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L267" class="LineNr">267 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Normal">int</span> w=tb_width<span class="Delimiter">();</span>
+<span id="L269" class="LineNr">269 </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="L270" class="LineNr">270 </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="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> ++Display_column<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="Delimiter">}</span>
+<span id="L274" class="LineNr">274 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L275" class="LineNr">275 </span><span class="Delimiter">}</span>
+<span id="L276" class="LineNr">276 </span>
+<span id="L277" class="LineNr">277 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L278" class="LineNr">278 </span>MOVE_CURSOR_LEFT_ON_DISPLAY<span class="Delimiter">,</span>
+<span id="L279" class="LineNr">279 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L280" class="LineNr">280 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;move-cursor-left-on-display&quot;</span><span class="Delimiter">,</span> MOVE_CURSOR_LEFT_ON_DISPLAY<span class="Delimiter">);</span>
+<span id="L281" class="LineNr">281 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L282" class="LineNr">282 </span><span class="Normal">case</span> MOVE_CURSOR_LEFT_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L283" class="LineNr">283 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L286" class="LineNr">286 </span><span class="Normal">case</span> MOVE_CURSOR_LEFT_ON_DISPLAY: <span class="Delimiter">{</span>
+<span id="L287" class="LineNr">287 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L288" class="LineNr">288 </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="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> --Display_column<span class="Delimiter">;</span>
+<span id="L290" class="LineNr">290 </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="L291" class="LineNr">291 </span>  <span class="Delimiter">}</span>
+<span id="L292" class="LineNr">292 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L293" class="LineNr">293 </span><span class="Delimiter">}</span>
+<span id="L294" class="LineNr">294 </span>
+<span id="L295" class="LineNr">295 </span><span class="Comment">//: as a convenience, make $print mostly work in console mode</span>
+<span id="L296" class="LineNr">296 </span><span class="Delimiter">:(before &quot;End $print 10/newline Special-cases&quot;)</span>
+<span id="L297" class="LineNr">297 </span><span class="Normal">else</span> <span class="Normal">if</span> <span class="Delimiter">(</span>tb_is_active<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+<span id="L298" class="LineNr">298 </span>  <a href='080display.cc.html#L301'>move_cursor_to_start_of_next_line_on_display</a><span class="Delimiter">();</span>
+<span id="L299" class="LineNr">299 </span><span class="Delimiter">}</span>
+<span id="L300" class="LineNr">300 </span><span class="Delimiter">:(code)</span>
+<span id="L301" class="LineNr">301 </span><span class="Normal">void</span> <a href='080display.cc.html#L301'>move_cursor_to_start_of_next_line_on_display</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L302" class="LineNr">302 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>Display_row &lt; tb_height<span class="Delimiter">()</span>-<span class="Constant">1</span><span class="Delimiter">)</span> ++Display_row<span class="Delimiter">;</span>
+<span id="L303" class="LineNr">303 </span>  <span class="Normal">else</span> Display_row = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L304" class="LineNr">304 </span>  Display_column = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L305" class="LineNr">305 </span>  tb_set_cursor<span class="Delimiter">(</span>Display_column<span class="Delimiter">,</span> Display_row<span class="Delimiter">);</span>
+<span id="L306" class="LineNr">306 </span><span class="Delimiter">}</span>
+<span id="L307" class="LineNr">307 </span>
+<span id="L308" class="LineNr">308 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L309" class="LineNr">309 </span>DISPLAY_WIDTH<span class="Delimiter">,</span>
+<span id="L310" class="LineNr">310 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L311" class="LineNr">311 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;display-width&quot;</span><span class="Delimiter">,</span> DISPLAY_WIDTH<span class="Delimiter">);</span>
+<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> DISPLAY_WIDTH: <span class="Delimiter">{</span>
+<span id="L314" class="LineNr">314 </span>  <span class="Identifier">break</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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L317" class="LineNr">317 </span><span class="Normal">case</span> DISPLAY_WIDTH: <span class="Delimiter">{</span>
+<span id="L318" class="LineNr">318 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L319" class="LineNr">319 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L320" class="LineNr">320 </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>tb_width<span class="Delimiter">());</span>
+<span id="L321" class="LineNr">321 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L322" class="LineNr">322 </span><span class="Delimiter">}</span>
+<span id="L323" class="LineNr">323 </span>
+<span id="L324" class="LineNr">324 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L325" class="LineNr">325 </span>DISPLAY_HEIGHT<span class="Delimiter">,</span>
+<span id="L326" class="LineNr">326 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L327" class="LineNr">327 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;display-height&quot;</span><span class="Delimiter">,</span> DISPLAY_HEIGHT<span class="Delimiter">);</span>
+<span id="L328" class="LineNr">328 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L329" class="LineNr">329 </span><span class="Normal">case</span> DISPLAY_HEIGHT: <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>
+<span id="L332" class="LineNr">332 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L333" class="LineNr">333 </span><span class="Normal">case</span> DISPLAY_HEIGHT: <span class="Delimiter">{</span>
+<span id="L334" class="LineNr">334 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L335" class="LineNr">335 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L336" class="LineNr">336 </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>tb_height<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>
+<span id="L340" class="LineNr">340 </span><span class="SalientComment">//:: Keyboard/mouse management</span>
+<span id="L341" class="LineNr">341 </span>
+<span id="L342" class="LineNr">342 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L343" class="LineNr">343 </span>WAIT_FOR_SOME_INTERACTION<span class="Delimiter">,</span>
+<span id="L344" class="LineNr">344 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L345" class="LineNr">345 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;wait-for-some-interaction&quot;</span><span class="Delimiter">,</span> WAIT_FOR_SOME_INTERACTION<span class="Delimiter">);</span>
+<span id="L346" class="LineNr">346 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L347" class="LineNr">347 </span><span class="Normal">case</span> WAIT_FOR_SOME_INTERACTION: <span class="Delimiter">{</span>
+<span id="L348" class="LineNr">348 </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="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L351" class="LineNr">351 </span><span class="Normal">case</span> WAIT_FOR_SOME_INTERACTION: <span class="Delimiter">{</span>
+<span id="L352" class="LineNr">352 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L353" class="LineNr">353 </span>  tb_event event<span class="Delimiter">;</span>
+<span id="L354" class="LineNr">354 </span>  tb_poll_event<span class="Delimiter">(</span>&amp;event<span class="Delimiter">);</span>
+<span id="L355" class="LineNr">355 </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 id="L358" class="LineNr">358 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L359" class="LineNr">359 </span>CHECK_FOR_INTERACTION<span class="Delimiter">,</span>
+<span id="L360" class="LineNr">360 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L361" class="LineNr">361 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;check-for-interaction&quot;</span><span class="Delimiter">,</span> CHECK_FOR_INTERACTION<span class="Delimiter">);</span>
+<span id="L362" class="LineNr">362 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L363" class="LineNr">363 </span><span class="Normal">case</span> CHECK_FOR_INTERACTION: <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>
+<span id="L366" class="LineNr">366 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L367" class="LineNr">367 </span><span class="Normal">case</span> CHECK_FOR_INTERACTION: <span class="Delimiter">{</span>
+<span id="L368" class="LineNr">368 </span>  <a href='080display.cc.html#L20'>CHECK_CONSOLE</a><span class="Delimiter">;</span>
+<span id="L369" class="LineNr">369 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// result and status</span>
+<span id="L370" class="LineNr">370 </span>  tb_event event<span class="Delimiter">;</span>
+<span id="L371" class="LineNr">371 </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="L372" class="LineNr">372 </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="L373" class="LineNr">373 </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="L374" class="LineNr">374 </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="L375" class="LineNr">375 </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="L376" class="LineNr">376 </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="L377" class="LineNr">377 </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="L378" class="LineNr">378 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L379" class="LineNr">379 </span>  <span class="Delimiter">}</span>
+<span id="L380" class="LineNr">380 </span>  <span class="Comment">// treat keys within ascii as unicode characters</span>
+<span id="L381" class="LineNr">381 </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="L382" class="LineNr">382 </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="L383" class="LineNr">383 </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="L384" class="LineNr">384 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> tb_shutdown<span class="Delimiter">();</span>
+<span id="L385" class="LineNr">385 </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="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L387" class="LineNr">387 </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="L388" class="LineNr">388 </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="L389" class="LineNr">389 </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="L390" class="LineNr">390 </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="L391" class="LineNr">391 </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="L392" class="LineNr">392 </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="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</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="Comment">// keys outside ascii aren't unicode characters but arbitrary termbox inventions</span>
+<span id="L396" class="LineNr">396 </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="L397" class="LineNr">397 </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="L398" class="LineNr">398 </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="L399" class="LineNr">399 </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="L400" class="LineNr">400 </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="L401" class="LineNr">401 </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="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L403" class="LineNr">403 </span>  <span class="Delimiter">}</span>
+<span id="L404" class="LineNr">404 </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="L405" class="LineNr">405 </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="L406" class="LineNr">406 </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="L407" class="LineNr">407 </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="L408" class="LineNr">408 </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="L409" class="LineNr">409 </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="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>event_type == TB_EVENT_RESIZE<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L413" class="LineNr">413 </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="L414" class="LineNr">414 </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="L415" class="LineNr">415 </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="L416" class="LineNr">416 </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="L417" class="LineNr">417 </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="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L419" class="LineNr">419 </span>  <span class="Delimiter">}</span>
+<span id="L420" class="LineNr">420 </span>  assert<span class="Delimiter">(</span>event_type == <span class="Constant">0</span><span class="Delimiter">);</span>
+<span id="L421" class="LineNr">421 </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="L422" class="LineNr">422 </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="L423" class="LineNr">423 </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="L424" class="LineNr">424 </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="L425" class="LineNr">425 </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="L426" class="LineNr">426 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L427" class="LineNr">427 </span><span class="Delimiter">}</span>
+<span id="L428" class="LineNr">428 </span>
+<span id="L429" class="LineNr">429 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L430" class="LineNr">430 </span>INTERACTIONS_LEFT<span class="Delimiter">,</span>
+<span id="L431" class="LineNr">431 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L432" class="LineNr">432 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;interactions-left?&quot;</span><span class="Delimiter">,</span> INTERACTIONS_LEFT<span class="Delimiter">);</span>
+<span id="L433" class="LineNr">433 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L434" class="LineNr">434 </span><span class="Normal">case</span> INTERACTIONS_LEFT: <span class="Delimiter">{</span>
+<span id="L435" class="LineNr">435 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L436" class="LineNr">436 </span><span class="Delimiter">}</span>
+<span id="L437" class="LineNr">437 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L438" class="LineNr">438 </span><span class="Normal">case</span> INTERACTIONS_LEFT: <span class="Delimiter">{</span>
+<span id="L439" class="LineNr">439 </span>  <a href='080display.cc.html#L20'>CHECK_CONSOLE</a><span class="Delimiter">;</span>
+<span id="L440" class="LineNr">440 </span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+<span id="L441" class="LineNr">441 </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>tb_event_ready<span class="Delimiter">());</span>
+<span id="L442" class="LineNr">442 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L443" class="LineNr">443 </span><span class="Delimiter">}</span>
+<span id="L444" class="LineNr">444 </span>
+<span id="L445" class="LineNr">445 </span><span class="Comment">//: hack to make text-mode apps more responsive under Unix</span>
+<span id="L446" class="LineNr">446 </span>
+<span id="L447" class="LineNr">447 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+<span id="L448" class="LineNr">448 </span>CLEAR_DISPLAY_FROM<span class="Delimiter">,</span>
+<span id="L449" class="LineNr">449 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+<span id="L450" class="LineNr">450 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;clear-display-from&quot;</span><span class="Delimiter">,</span> CLEAR_DISPLAY_FROM<span class="Delimiter">);</span>
+<span id="L451" class="LineNr">451 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+<span id="L452" class="LineNr">452 </span><span class="Normal">case</span> CLEAR_DISPLAY_FROM: <span class="Delimiter">{</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L454" class="LineNr">454 </span><span class="Delimiter">}</span>
+<span id="L455" class="LineNr">455 </span><span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+<span id="L456" class="LineNr">456 </span><span class="Normal">case</span> CLEAR_DISPLAY_FROM: <span class="Delimiter">{</span>
+<span id="L457" class="LineNr">457 </span>  <a href='080display.cc.html#L12'>CHECK_SCREEN</a><span class="Delimiter">;</span>
+<span id="L458" class="LineNr">458 </span>  <span class="Comment">// todo: error checking</span>
+<span id="L459" class="LineNr">459 </span>  <span class="Normal">int</span> row = 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="L460" class="LineNr">460 </span>  <span class="Normal">int</span> column = 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="L461" class="LineNr">461 </span>  <span class="Normal">int</span> left = 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="L462" class="LineNr">462 </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="L463" class="LineNr">463 </span>  <span class="Normal">int</span> height=tb_height<span class="Delimiter">();</span>
+<span id="L464" class="LineNr">464 </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="L465" class="LineNr">465 </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="L466" class="LineNr">466 </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="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Delimiter">}</span>
+<span id="L469" class="LineNr">469 </span>  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span id="L470" class="LineNr">470 </span><span class="Delimiter">}</span>
 </pre>
 </body>
 </html>
diff --git a/html/081print.mu.html b/html/081print.mu.html
index 2ec87eb7..6b1b7367 100644
--- a/html/081print.mu.html
+++ b/html/081print.mu.html
@@ -660,127 +660,111 @@ if ('onhashchange' in window) {
 <span id="L597" class="LineNr">597 </span>  height <span class="Special">&lt;-</span> display-height
 <span id="L598" class="LineNr">598 </span>]
 <span id="L599" class="LineNr">599 </span>
-<span id="L600" class="LineNr">600 </span><span class="muRecipe">def</span> <a href='081print.mu.html#L600'>hide-cursor</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a><span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
+<span id="L600" class="LineNr">600 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, s:text<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
 <span id="L601" class="LineNr">601 </span>  <span class="Constant">local-scope</span>
 <span id="L602" class="LineNr">602 </span>  <span class="Constant">load-ingredients</span>
-<span id="L603" class="LineNr">603 </span>  <span class="muControl">return-if</span> <a href='081print.mu.html#L4'>screen</a>  <span class="Comment"># fake screen; do nothing</span>
-<span id="L604" class="LineNr">604 </span>  <span class="Comment"># real screen</span>
-<span id="L605" class="LineNr">605 </span>  hide-cursor-on-display
-<span id="L606" class="LineNr">606 </span>]
-<span id="L607" class="LineNr">607 </span>
-<span id="L608" class="LineNr">608 </span><span class="muRecipe">def</span> <a href='081print.mu.html#L608'>show-cursor</a> <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a><span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
-<span id="L609" class="LineNr">609 </span>  <span class="Constant">local-scope</span>
-<span id="L610" class="LineNr">610 </span>  <span class="Constant">load-ingredients</span>
-<span id="L611" class="LineNr">611 </span>  <span class="muControl">return-if</span> <a href='081print.mu.html#L4'>screen</a>  <span class="Comment"># fake screen; do nothing</span>
-<span id="L612" class="LineNr">612 </span>  <span class="Comment"># real screen</span>
-<span id="L613" class="LineNr">613 </span>  show-cursor-on-display
-<span id="L614" class="LineNr">614 </span>]
-<span id="L615" class="LineNr">615 </span>
-<span id="L616" class="LineNr">616 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, s:text<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
-<span id="L617" class="LineNr">617 </span>  <span class="Constant">local-scope</span>
-<span id="L618" class="LineNr">618 </span>  <span class="Constant">load-ingredients</span>
-<span id="L619" class="LineNr">619 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L620" class="LineNr">620 </span>  <span class="Delimiter">{</span>
-<span id="L621" class="LineNr">621 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
-<span id="L622" class="LineNr">622 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
-<span id="L623" class="LineNr">623 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L603" class="LineNr">603 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L604" class="LineNr">604 </span>  <span class="Delimiter">{</span>
+<span id="L605" class="LineNr">605 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L606" class="LineNr">606 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L607" class="LineNr">607 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L608" class="LineNr">608 </span>  <span class="Delimiter">}</span>
+<span id="L609" class="LineNr">609 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L610" class="LineNr">610 </span>  <span class="Delimiter">{</span>
+<span id="L611" class="LineNr">611 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L612" class="LineNr">612 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L613" class="LineNr">613 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L614" class="LineNr">614 </span>  <span class="Delimiter">}</span>
+<span id="L615" class="LineNr">615 </span>  len:num <span class="Special">&lt;-</span> length *s
+<span id="L616" class="LineNr">616 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
+<span id="L617" class="LineNr">617 </span>  <span class="Delimiter">{</span>
+<span id="L618" class="LineNr">618 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
+<span id="L619" class="LineNr">619 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
+<span id="L620" class="LineNr">620 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *s, i
+<span id="L621" class="LineNr">621 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c, color, bg-color
+<span id="L622" class="LineNr">622 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
+<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>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L626" class="LineNr">626 </span>  <span class="Delimiter">{</span>
-<span id="L627" class="LineNr">627 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
-<span id="L628" class="LineNr">628 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
-<span id="L629" class="LineNr">629 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
-<span id="L630" class="LineNr">630 </span>  <span class="Delimiter">}</span>
-<span id="L631" class="LineNr">631 </span>  len:num <span class="Special">&lt;-</span> length *s
-<span id="L632" class="LineNr">632 </span>  i:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
-<span id="L633" class="LineNr">633 </span>  <span class="Delimiter">{</span>
-<span id="L634" class="LineNr">634 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal i, len
-<span id="L635" class="LineNr">635 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
-<span id="L636" class="LineNr">636 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *s, i
-<span id="L637" class="LineNr">637 </span>  <span class="Conceal">¦</span> print <a href='081print.mu.html#L4'>screen</a>, c, color, bg-color
-<span id="L638" class="LineNr">638 </span>  <span class="Conceal">¦</span> i <span class="Special">&lt;-</span> add i,<span class="Constant"> 1</span>
-<span id="L639" class="LineNr">639 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
-<span id="L640" class="LineNr">640 </span>  <span class="Delimiter">}</span>
-<span id="L641" class="LineNr">641 </span>]
-<span id="L642" class="LineNr">642 </span>
-<span id="L643" class="LineNr">643 </span><span class="muScenario">scenario</span> print-text-stops-at-right-margin [
-<span id="L644" class="LineNr">644 </span>  <span class="Constant">local-scope</span>
-<span id="L645" class="LineNr">645 </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="L646" class="LineNr">646 </span>  run [
-<span id="L647" class="LineNr">647 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, <span class="Constant">[abcd]</span>
-<span id="L648" class="LineNr">648 </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="L649" class="LineNr">649 </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="L650" class="LineNr">650 </span>  ]
-<span id="L651" class="LineNr">651 </span>  memory-should-contain [
-<span id="L652" class="LineNr">652 </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="L653" class="LineNr">653 </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="L654" class="LineNr">654 </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="L655" class="LineNr">655 </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="L656" class="LineNr">656 </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="L657" class="LineNr">657 </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="L658" class="LineNr">658 </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="L659" class="LineNr">659 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
-<span id="L660" class="LineNr">660 </span>  <span class="Conceal">¦</span><span class="Constant"> 17</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
-<span id="L661" class="LineNr">661 </span>  ]
-<span id="L662" class="LineNr">662 </span>]
-<span id="L663" class="LineNr">663 </span>
-<span id="L664" class="LineNr">664 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, n:num<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
-<span id="L665" class="LineNr">665 </span>  <span class="Constant">local-scope</span>
-<span id="L666" class="LineNr">666 </span>  <span class="Constant">load-ingredients</span>
-<span id="L667" class="LineNr">667 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L668" class="LineNr">668 </span>  <span class="Delimiter">{</span>
-<span id="L669" class="LineNr">669 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
-<span id="L670" class="LineNr">670 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
-<span id="L671" class="LineNr">671 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
-<span id="L672" class="LineNr">672 </span>  <span class="Delimiter">}</span>
-<span id="L673" class="LineNr">673 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L674" class="LineNr">674 </span>  <span class="Delimiter">{</span>
-<span id="L675" class="LineNr">675 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
-<span id="L676" class="LineNr">676 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
-<span id="L677" class="LineNr">677 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
-<span id="L678" class="LineNr">678 </span>  <span class="Delimiter">}</span>
-<span id="L679" class="LineNr">679 </span>  <span class="Comment"># todo: other bases besides decimal</span>
-<span id="L680" class="LineNr">680 </span>  s:text <span class="Special">&lt;-</span> to-text n
-<span id="L681" class="LineNr">681 </span>  <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, s, color, bg-color
-<span id="L682" class="LineNr">682 </span>]
-<span id="L683" class="LineNr">683 </span>
-<span id="L684" class="LineNr">684 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, n:bool<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
-<span id="L685" class="LineNr">685 </span>  <span class="Constant">local-scope</span>
-<span id="L686" class="LineNr">686 </span>  <span class="Constant">load-ingredients</span>
-<span id="L687" class="LineNr">687 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L688" class="LineNr">688 </span>  <span class="Delimiter">{</span>
-<span id="L689" class="LineNr">689 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
-<span id="L690" class="LineNr">690 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
-<span id="L691" class="LineNr">691 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
-<span id="L692" class="LineNr">692 </span>  <span class="Delimiter">}</span>
-<span id="L693" class="LineNr">693 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L694" class="LineNr">694 </span>  <span class="Delimiter">{</span>
-<span id="L695" class="LineNr">695 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
-<span id="L696" class="LineNr">696 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
-<span id="L697" class="LineNr">697 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
-<span id="L698" class="LineNr">698 </span>  <span class="Delimiter">}</span>
-<span id="L699" class="LineNr">699 </span>  n2:num <span class="Special">&lt;-</span> copy n
-<span id="L700" class="LineNr">700 </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
-<span id="L701" class="LineNr">701 </span>]
-<span id="L702" class="LineNr">702 </span>
-<span id="L703" class="LineNr">703 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, n:&amp;:_elem<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
-<span id="L704" class="LineNr">704 </span>  <span class="Constant">local-scope</span>
-<span id="L705" class="LineNr">705 </span>  <span class="Constant">load-ingredients</span>
-<span id="L706" class="LineNr">706 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L707" class="LineNr">707 </span>  <span class="Delimiter">{</span>
-<span id="L708" class="LineNr">708 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
-<span id="L709" class="LineNr">709 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
-<span id="L710" class="LineNr">710 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
-<span id="L711" class="LineNr">711 </span>  <span class="Delimiter">}</span>
-<span id="L712" class="LineNr">712 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L713" class="LineNr">713 </span>  <span class="Delimiter">{</span>
-<span id="L714" class="LineNr">714 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
-<span id="L715" class="LineNr">715 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
-<span id="L716" class="LineNr">716 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
-<span id="L717" class="LineNr">717 </span>  <span class="Delimiter">}</span>
-<span id="L718" class="LineNr">718 </span>  n2:num <span class="Special">&lt;-</span> copy n
-<span id="L719" class="LineNr">719 </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
-<span id="L720" class="LineNr">720 </span>]
+<span id="L625" class="LineNr">625 </span>]
+<span id="L626" class="LineNr">626 </span>
+<span id="L627" class="LineNr">627 </span><span class="muScenario">scenario</span> print-text-stops-at-right-margin [
+<span id="L628" class="LineNr">628 </span>  <span class="Constant">local-scope</span>
+<span id="L629" class="LineNr">629 </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="L630" class="LineNr">630 </span>  run [
+<span id="L631" class="LineNr">631 </span>  <span class="Conceal">¦</span> fake-screen <span class="Special">&lt;-</span> print fake-screen, <span class="Constant">[abcd]</span>
+<span id="L632" class="LineNr">632 </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="L633" class="LineNr">633 </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="L634" class="LineNr">634 </span>  ]
+<span id="L635" class="LineNr">635 </span>  memory-should-contain [
+<span id="L636" class="LineNr">636 </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="L637" class="LineNr">637 </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="L638" class="LineNr">638 </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="L639" class="LineNr">639 </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="L640" class="LineNr">640 </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="L641" class="LineNr">641 </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="L642" class="LineNr">642 </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="L643" class="LineNr">643 </span>  <span class="Conceal">¦</span> <span class="Comment"># rest of screen is empty</span>
+<span id="L644" class="LineNr">644 </span>  <span class="Conceal">¦</span><span class="Constant"> 17</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>
+<span id="L645" class="LineNr">645 </span>  ]
+<span id="L646" class="LineNr">646 </span>]
+<span id="L647" class="LineNr">647 </span>
+<span id="L648" class="LineNr">648 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, n:num<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
+<span id="L649" class="LineNr">649 </span>  <span class="Constant">local-scope</span>
+<span id="L650" class="LineNr">650 </span>  <span class="Constant">load-ingredients</span>
+<span id="L651" class="LineNr">651 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L652" class="LineNr">652 </span>  <span class="Delimiter">{</span>
+<span id="L653" class="LineNr">653 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L654" class="LineNr">654 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L655" class="LineNr">655 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L656" class="LineNr">656 </span>  <span class="Delimiter">}</span>
+<span id="L657" class="LineNr">657 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L658" class="LineNr">658 </span>  <span class="Delimiter">{</span>
+<span id="L659" class="LineNr">659 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L660" class="LineNr">660 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L661" class="LineNr">661 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L662" class="LineNr">662 </span>  <span class="Delimiter">}</span>
+<span id="L663" class="LineNr">663 </span>  <span class="Comment"># todo: other bases besides decimal</span>
+<span id="L664" class="LineNr">664 </span>  s:text <span class="Special">&lt;-</span> to-text n
+<span id="L665" class="LineNr">665 </span>  <a href='081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> print <a href='081print.mu.html#L4'>screen</a>, s, color, bg-color
+<span id="L666" class="LineNr">666 </span>]
+<span id="L667" class="LineNr">667 </span>
+<span id="L668" class="LineNr">668 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, n:bool<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
+<span id="L669" class="LineNr">669 </span>  <span class="Constant">local-scope</span>
+<span id="L670" class="LineNr">670 </span>  <span class="Constant">load-ingredients</span>
+<span id="L671" class="LineNr">671 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L672" class="LineNr">672 </span>  <span class="Delimiter">{</span>
+<span id="L673" class="LineNr">673 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L674" class="LineNr">674 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L675" class="LineNr">675 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L676" class="LineNr">676 </span>  <span class="Delimiter">}</span>
+<span id="L677" class="LineNr">677 </span>  bg-color:num, bg-color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L678" class="LineNr">678 </span>  <span class="Delimiter">{</span>
+<span id="L679" class="LineNr">679 </span>  <span class="Conceal">¦</span> <span class="Comment"># default bg-color to black</span>
+<span id="L680" class="LineNr">680 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> bg-color-found?
+<span id="L681" class="LineNr">681 </span>  <span class="Conceal">¦</span> bg-color <span class="Special">&lt;-</span> copy <span class="Constant">0/black</span>
+<span id="L682" class="LineNr">682 </span>  <span class="Delimiter">}</span>
+<span id="L683" class="LineNr">683 </span>  n2:num <span class="Special">&lt;-</span> copy n
+<span id="L684" class="LineNr">684 </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
+<span id="L685" class="LineNr">685 </span>]
+<span id="L686" class="LineNr">686 </span>
+<span id="L687" class="LineNr">687 </span><span class="muRecipe">def</span> print <a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a>, n:&amp;:_elem<span class="muRecipe"> -&gt; </span><a href='081print.mu.html#L4'>screen</a>:&amp;:<a href='081print.mu.html#L4'>screen</a> [
+<span id="L688" class="LineNr">688 </span>  <span class="Constant">local-scope</span>
+<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="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="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>  n2:num <span class="Special">&lt;-</span> copy n
+<span id="L703" class="LineNr">703 </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
+<span id="L704" class="LineNr">704 </span>]
 </pre>
 </body>
 </html>
diff --git a/html/084console.mu.html b/html/084console.mu.html
index 16712057..8e1b7952 100644
--- a/html/084console.mu.html
+++ b/html/084console.mu.html
@@ -157,13 +157,12 @@ if ('onhashchange' in window) {
 <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 id="L99" class="LineNr"> 99 </span><span class="Comment"># use this helper to skip rendering if there's lots of other events queued up</span>
-<span id="L100" class="LineNr">100 </span><span class="muRecipe">def</span> <a href='084console.mu.html#L100'>has-more-events?</a> <a href='084console.mu.html#L23'>console</a>:&amp;:<a href='084console.mu.html#L23'>console</a><span class="muRecipe"> -&gt; </span>result:bool [
-<span id="L101" class="LineNr">101 </span>  <span class="Constant">local-scope</span>
-<span id="L102" class="LineNr">102 </span>  <span class="Constant">load-ingredients</span>
-<span id="L103" class="LineNr">103 </span>  <span class="muControl">return-if</span> <a href='084console.mu.html#L23'>console</a>, <span class="Constant">0/false</span>  <span class="Comment"># fake consoles should be plenty fast; never skip</span>
-<span id="L104" class="LineNr">104 </span>  result <span class="Special">&lt;-</span> interactions-left?
-<span id="L105" class="LineNr">105 </span>]
+<span id="L99" class="LineNr"> 99 </span><span class="muRecipe">def</span> <a href='084console.mu.html#L99'>has-more-events?</a> <a href='084console.mu.html#L23'>console</a>:&amp;:<a href='084console.mu.html#L23'>console</a><span class="muRecipe"> -&gt; </span>result:bool [
+<span id="L100" class="LineNr">100 </span>  <span class="Constant">local-scope</span>
+<span id="L101" class="LineNr">101 </span>  <span class="Constant">load-ingredients</span>
+<span id="L102" class="LineNr">102 </span>  <span class="muControl">return-if</span> <a href='084console.mu.html#L23'>console</a>, <span class="Constant">0/false</span>  <span class="Comment"># fake events are processed as soon as they arrive</span>
+<span id="L103" class="LineNr">103 </span>  result <span class="Special">&lt;-</span> interactions-left?
+<span id="L104" class="LineNr">104 </span>]
 </pre>
 </body>
 </html>
diff --git a/html/edit/004-programming-environment.mu.html b/html/edit/004-programming-environment.mu.html
index 2aeba796..bc4394cd 100644
--- a/html/edit/004-programming-environment.mu.html
+++ b/html/edit/004-programming-environment.mu.html
@@ -70,7 +70,7 @@ if ('onhashchange' in window) {
 <span id="L7" class="LineNr">  7 </span>  <span class="Constant">local-scope</span>
 <span id="L8" class="LineNr">  8 </span>  open-console
 <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> <span class="Constant">0/filesystem</span>, <span class="Constant">0/screen</span>
-<span id="L10" class="LineNr"> 10 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <span class="Constant">0/screen</span>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L10" class="LineNr"> 10 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <span class="Constant">0/screen</span>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L11" class="LineNr"> 11 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <span class="Constant">0/screen</span>, <span class="Constant">0/console</span>, env, <span class="Constant">0/filesystem</span>
 <span id="L12" class="LineNr"> 12 </span>  <span class="Comment"># never gets here</span>
 <span id="L13" class="LineNr"> 13 </span>]
@@ -105,513 +105,464 @@ if ('onhashchange' in window) {
 <span id="L42" class="LineNr"> 42 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
 <span id="L43" class="LineNr"> 43 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
 <span id="L44" class="LineNr"> 44 </span>  sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
-<span id="L45" class="LineNr"> 45 </span>  <span class="Comment"># if we fall behind we'll stop updating the screen, but then we have to</span>
-<span id="L46" class="LineNr"> 46 </span>  <span class="Comment"># render the entire screen when we catch up.</span>
-<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="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#L495'>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#L163'>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> env, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L163'>resize</a> <a href='../081print.mu.html#L4'>screen</a>, env
-<span id="L94" class="LineNr"> 94 </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#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='004-programming-environment.mu.html#L190'>render-without-moving-cursor</a>
-<span id="L95" class="LineNr"> 95 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</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="Comment"># if it's not global and not a touch event, send to appropriate editor</span>
-<span id="L98" class="LineNr"> 98 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
-<span id="L99" class="LineNr"> 99 </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="L100" class="LineNr">100 </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="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
-<span id="L102" class="LineNr">102 </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="L103" class="LineNr">103 </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="L104" class="LineNr">104 </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="L105" class="LineNr">105 </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="L106" class="LineNr">106 </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="Conceal">¦</span> <span class="muControl">break-unless</span> more-events?
-<span id="L108" class="LineNr">108 </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="L109" class="LineNr">109 </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="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</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="Conceal">¦</span> <span class="muControl">break-if</span> more-events?
-<span id="L113" class="LineNr">113 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</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> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render-all-on-no-more-events?
-<span id="L115" class="LineNr">115 </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="L116" class="LineNr">116 </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#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L117" class="LineNr">117 </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="L118" class="LineNr">118 </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="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</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="Comment"># no more events, no force render</span>
-<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</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="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render?
-<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="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L461'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<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="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</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="Delimiter">}</span>
-<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <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="muControl">break-unless</span> sandbox-in-focus?
-<span id="L130" class="LineNr">130 </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="L131" class="LineNr">131 </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="L132" class="LineNr">132 </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="L133" class="LineNr">133 </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="L134" class="LineNr">134 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</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="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> more-events?
-<span id="L136" class="LineNr">136 </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="L137" class="LineNr">137 </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="L138" class="LineNr">138 </span>  <span class="Conceal">¦</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="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="Conceal">¦</span> <span class="muControl">break-if</span> more-events?
-<span id="L141" class="LineNr">141 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <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="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render-all-on-no-more-events?
-<span id="L143" class="LineNr">143 </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="L144" class="LineNr">144 </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#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L145" class="LineNr">145 </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="L146" class="LineNr">146 </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="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</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="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># no more events, no force render</span>
-<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</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="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render?
-<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="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#L121'>render</a>
-<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="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</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="Delimiter">}</span>
-<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L156" class="LineNr">156 </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="L157" class="LineNr">157 </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#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<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="muControl">loop</span>
-<span id="L160" class="LineNr">160 </span>  <span class="Delimiter">}</span>
-<span id="L161" class="LineNr">161 </span>]
-<span id="L162" class="LineNr">162 </span>
-<span id="L163" class="LineNr">163 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L163'>resize</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment<span class="muRecipe"> -&gt; </span>env:&amp;:environment, <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
-<span id="L164" class="LineNr">164 </span>  <span class="Constant">local-scope</span>
-<span id="L165" class="LineNr">165 </span>  <span class="Constant">load-ingredients</span>
-<span id="L166" class="LineNr">166 </span>  <a href='../081print.mu.html#L27'>clear-screen</a> <a href='../081print.mu.html#L4'>screen</a>  <span class="Comment"># update screen dimensions</span>
-<span id="L167" class="LineNr">167 </span>  width:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L574'>screen-width</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L168" class="LineNr">168 </span>  divider:num, _ <span class="Special">&lt;-</span> divide-with-remainder width,<span class="Constant"> 2</span>
-<span id="L169" class="LineNr">169 </span>  <span class="Comment"># update recipe editor</span>
-<span id="L170" class="LineNr">170 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L171" class="LineNr">171 </span>  right:num <span class="Special">&lt;-</span> subtract divider,<span class="Constant"> 1</span>
-<span id="L172" class="LineNr">172 </span>  *recipes <span class="Special">&lt;-</span> put *recipes, <span class="Constant">right:offset</span>, right
-<span id="L173" class="LineNr">173 </span>  <span class="Comment"># reset cursor (later we'll try to preserve its position)</span>
-<span id="L174" class="LineNr">174 </span>  *recipes <span class="Special">&lt;-</span> put *recipes, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 1</span>
-<span id="L175" class="LineNr">175 </span>  *recipes <span class="Special">&lt;-</span> put *recipes, <span class="Constant">cursor-column:offset</span>,<span class="Constant"> 0</span>
-<span id="L176" class="LineNr">176 </span>  <span class="Comment"># update sandbox editor</span>
-<span id="L177" class="LineNr">177 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L178" class="LineNr">178 </span>  left:num <span class="Special">&lt;-</span> add divider,<span class="Constant"> 1</span>
-<span id="L179" class="LineNr">179 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">left:offset</span>, left
-<span id="L180" class="LineNr">180 </span>  right:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 1</span>
-<span id="L181" class="LineNr">181 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">right:offset</span>, right
-<span id="L182" class="LineNr">182 </span>  <span class="Comment"># reset cursor (later we'll try to preserve its position)</span>
-<span id="L183" class="LineNr">183 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 1</span>
-<span id="L184" class="LineNr">184 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">cursor-column:offset</span>, left
-<span id="L185" class="LineNr">185 </span>]
-<span id="L186" class="LineNr">186 </span>
-<span id="L187" class="LineNr">187 </span><span class="Comment"># Variant of 'render' that updates cursor-row and cursor-column based on</span>
-<span id="L188" class="LineNr">188 </span><span class="Comment"># before-cursor (rather than the other way around). If before-cursor moves</span>
-<span id="L189" class="LineNr">189 </span><span class="Comment"># off-screen, it resets cursor-row and cursor-column.</span>
-<span id="L190" class="LineNr">190 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L190'>render-without-moving-cursor</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, editor:&amp;:editor<span class="muRecipe"> -&gt; </span>last-row:num, last-column:num, <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, editor:&amp;:editor [
-<span id="L191" class="LineNr">191 </span>  <span class="Constant">local-scope</span>
-<span id="L192" class="LineNr">192 </span>  <span class="Constant">load-ingredients</span>
-<span id="L193" class="LineNr">193 </span>  <span class="muControl">return-unless</span> editor, <span class="Constant">1/top</span>, <span class="Constant">0/left</span>
-<span id="L194" class="LineNr">194 </span>  left:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">left:offset</span>
-<span id="L195" class="LineNr">195 </span>  <a href='../081print.mu.html#L587'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L587'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L196" class="LineNr">196 </span>  right:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">right:offset</span>
-<span id="L197" class="LineNr">197 </span>  curr:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L198" class="LineNr">198 </span>  <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> copy curr  <span class="Comment"># just in case curr becomes null and we can't compute prev</span>
-<span id="L199" class="LineNr">199 </span>  curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L200" class="LineNr">200 </span>  color:num <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
-<span id="L201" class="LineNr">201 </span>  row:num <span class="Special">&lt;-</span> copy <span class="Constant">1/top</span>
-<span id="L202" class="LineNr">202 </span>  column:num <span class="Special">&lt;-</span> copy left
-<span id="L203" class="LineNr">203 </span>  <span class="Comment"># save before-cursor</span>
-<span id="L204" class="LineNr">204 </span>  old-before-cursor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
-<span id="L205" class="LineNr">205 </span>  <span class="Comment"># initialze cursor-row/cursor-column/before-cursor to the top of the screen</span>
-<span id="L206" class="LineNr">206 </span>  <span class="Comment"># by default</span>
-<span id="L207" class="LineNr">207 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, row
-<span id="L208" class="LineNr">208 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, column
-<span id="L209" class="LineNr">209 </span>  top-of-screen:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
-<span id="L210" class="LineNr">210 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, top-of-screen
-<span id="L211" class="LineNr">211 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L212" class="LineNr">212 </span>  <span class="Delimiter">{</span>
-<span id="L213" class="LineNr">213 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
-<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
-<span id="L215" class="LineNr">215 </span>  <span class="Conceal">¦</span> off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L587'>screen-height</a>
-<span id="L216" class="LineNr">216 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> off-screen?
-<span id="L217" class="LineNr">217 </span>  <span class="Conceal">¦</span> <span class="Comment"># if we find old-before-cursor still on the new resized screen, update</span>
-<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> <span class="Comment"># editor.cursor-row and editor.cursor-column based on</span>
-<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Comment"># old-before-cursor</span>
-<span id="L220" class="LineNr">220 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
-<span id="L221" class="LineNr">221 </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="L222" class="LineNr">222 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor?
-<span id="L223" class="LineNr">223 </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="L224" class="LineNr">224 </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="L225" class="LineNr">225 </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="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
-<span id="L227" class="LineNr">227 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
-<span id="L228" class="LineNr">228 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;character-c-received&gt;</span>
-<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
-<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
-<span id="L231" class="LineNr">231 </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="L232" class="LineNr">232 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
-<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
-<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L401'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
-<span id="L235" class="LineNr">235 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># skip to next line</span>
-<span id="L236" class="LineNr">236 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L237" class="LineNr">237 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
-<span id="L238" class="LineNr">238 </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#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L239" class="LineNr">239 </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="L240" class="LineNr">240 </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="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</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="Delimiter">{</span>
-<span id="L244" class="LineNr">244 </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="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># room for clicking on the cursor after it.</span>
-<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
-<span id="L247" class="LineNr">247 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
-<span id="L248" class="LineNr">248 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
-<span id="L249" class="LineNr">249 </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="L250" class="LineNr">250 </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="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
-<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L253" class="LineNr">253 </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#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
-<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># don't increment curr</span>
-<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</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> print <a href='../081print.mu.html#L4'>screen</a>, c, color
-<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
-<span id="L259" class="LineNr">259 </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="L260" class="LineNr">260 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
-<span id="L261" class="LineNr">261 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
-<span id="L262" class="LineNr">262 </span>  <span class="Delimiter">}</span>
-<span id="L263" class="LineNr">263 </span>  <span class="Comment"># save first character off-screen</span>
-<span id="L264" class="LineNr">264 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom-of-screen:offset</span>, curr
-<span id="L265" class="LineNr">265 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom:offset</span>, row
-<span id="L266" class="LineNr">266 </span>  <span class="muControl">return</span> row, column
-<span id="L267" class="LineNr">267 </span>]
-<span id="L268" class="LineNr">268 </span>
-<span id="L269" class="LineNr">269 </span><span class="muScenario">scenario</span> point-at-multiple-editors [
-<span id="L270" class="LineNr">270 </span>  <span class="Constant">local-scope</span>
-<span id="L271" class="LineNr">271 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L272" class="LineNr">272 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
-<span id="L273" class="LineNr">273 </span>  <span class="Comment"># initialize both halves of screen</span>
-<span id="L274" class="LineNr">274 </span>  assume-resources [
-<span id="L275" class="LineNr">275 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L276" class="LineNr">276 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
-<span id="L277" class="LineNr">277 </span>  <span class="Conceal">¦</span> ]
-<span id="L278" class="LineNr">278 </span>  ]
-<span id="L279" class="LineNr">279 </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="L280" class="LineNr">280 </span>  <span class="Comment"># focus on both sides</span>
-<span id="L281" class="LineNr">281 </span>  assume-console [
-<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L283" class="LineNr">283 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
-<span id="L284" class="LineNr">284 </span>  ]
-<span id="L285" class="LineNr">285 </span>  <span class="Comment"># check cursor column in each</span>
-<span id="L286" class="LineNr">286 </span>  run [
-<span id="L287" class="LineNr">287 </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="L288" class="LineNr">288 </span>  <span class="Conceal">¦</span> recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L289" class="LineNr">289 </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="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L291" class="LineNr">291 </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="L292" class="LineNr">292 </span>  ]
-<span id="L293" class="LineNr">293 </span>  memory-should-contain [
-<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
-<span id="L295" class="LineNr">295 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 17</span>
-<span id="L296" class="LineNr">296 </span>  ]
-<span id="L297" class="LineNr">297 </span>]
-<span id="L298" class="LineNr">298 </span>
-<span id="L299" class="LineNr">299 </span><span class="muScenario">scenario</span> edit-multiple-editors [
-<span id="L300" class="LineNr">300 </span>  <span class="Constant">local-scope</span>
-<span id="L301" class="LineNr">301 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L302" class="LineNr">302 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
-<span id="L303" class="LineNr">303 </span>  <span class="Comment"># initialize both halves of screen</span>
-<span id="L304" class="LineNr">304 </span>  assume-resources [
-<span id="L305" class="LineNr">305 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L306" class="LineNr">306 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
-<span id="L307" class="LineNr">307 </span>  <span class="Conceal">¦</span> ]
-<span id="L308" class="LineNr">308 </span>  ]
-<span id="L309" class="LineNr">309 </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="L310" class="LineNr">310 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L311" class="LineNr">311 </span>  <span class="Comment"># type one letter in each of them</span>
-<span id="L312" class="LineNr">312 </span>  assume-console [
-<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
-<span id="L314" class="LineNr">314 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
-<span id="L315" class="LineNr">315 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
-<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
-<span id="L317" class="LineNr">317 </span>  ]
-<span id="L318" class="LineNr">318 </span>  run [
-<span id="L319" class="LineNr">319 </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="L320" class="LineNr">320 </span>  <span class="Conceal">¦</span> recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L321" class="LineNr">321 </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="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span> sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L323" class="LineNr">323 </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="L324" class="LineNr">324 </span>  ]
-<span id="L325" class="LineNr">325 </span>  screen-should-contain [
-<span id="L326" class="LineNr">326 </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="L327" class="LineNr">327 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc           ╎d1ef          .</span>
-<span id="L328" class="LineNr">328 </span>  <span class="Conceal">¦</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"> .               ╎              .</span>
-<span id="L331" class="LineNr">331 </span>  ]
-<span id="L332" class="LineNr">332 </span>  memory-should-contain [
-<span id="L333" class="LineNr">333 </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="L334" class="LineNr">334 </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="L45" class="LineNr"> 45 </span>  <span class="Delimiter">{</span>
+<span id="L46" class="LineNr"> 46 </span>  <span class="Conceal">¦</span> <span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
+<span id="L47" class="LineNr"> 47 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-event</span>
+<span id="L48" class="LineNr"> 48 </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="L49" class="LineNr"> 49 </span>  <span class="Conceal">¦</span> <span class="muControl">loop-unless</span> found?
+<span id="L50" class="LineNr"> 50 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> quit?  <span class="Comment"># only in tests</span>
+<span id="L51" class="LineNr"> 51 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
+<span id="L52" class="LineNr"> 52 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> <a href='004-programming-environment.mu.html#L52'>&lt;handle-event&gt;</a></span>
+<span id="L53" class="LineNr"> 53 </span>  <span class="Conceal">¦</span> <span class="Comment"># check for global events that will trigger regardless of which editor has focus</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> <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="L56" class="LineNr"> 56 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-keycode?
+<span id="L57" class="LineNr"> 57 </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#L57'>&lt;global-keypress&gt;</a></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="Delimiter">{</span>
+<span id="L60" class="LineNr"> 60 </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="L61" class="LineNr"> 61 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-unicode?
+<span id="L62" class="LineNr"> 62 </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#L62'>&lt;global-type&gt;</a></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="Comment"># 'touch' event - send to both sides, see what picks it up</span>
+<span id="L65" class="LineNr"> 65 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L66" class="LineNr"> 66 </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="L67" class="LineNr"> 67 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-touch?
+<span id="L68" class="LineNr"> 68 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># ignore all but 'left-click' events for now</span>
+<span id="L69" class="LineNr"> 69 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># todo: test this</span>
+<span id="L70" class="LineNr"> 70 </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="L71" class="LineNr"> 71 </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="L72" class="LineNr"> 72 </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="L73" class="LineNr"> 73 </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="L74" class="LineNr"> 74 </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="L75" class="LineNr"> 75 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># later exceptions for non-editor touches will go here</span>
+<span id="L76" class="LineNr"> 76 </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#L76'>&lt;global-touch&gt;</a></span>
+<span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># send to both editors</span>
+<span id="L78" class="LineNr"> 78 </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="L79" class="LineNr"> 79 </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="L80" class="LineNr"> 80 </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="L81" class="LineNr"> 81 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L82" class="LineNr"> 82 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L83" class="LineNr"> 83 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> <span class="Comment"># 'resize' event - redraw editor</span>
+<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="Comment"># todo: test this after supporting resize in assume-console</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> <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#L114'>resize</a>:variant</span>
+<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> is-resize?
+<span id="L89" class="LineNr"> 89 </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#L114'>resize</a> <a href='../081print.mu.html#L4'>screen</a>, env
+<span id="L90" class="LineNr"> 90 </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#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='004-programming-environment.mu.html#L141'>render-without-moving-cursor</a>
+<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</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"># if it's not global and not a touch event, send to appropriate editor</span>
+<span id="L94" class="LineNr"> 94 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
+<span id="L95" class="LineNr"> 95 </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="L96" class="LineNr"> 96 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</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="muControl">break-if</span> sandbox-in-focus?
+<span id="L98" class="LineNr"> 98 </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="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render?
+<span id="L100" class="LineNr">100 </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#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<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="Conceal">¦</span> <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="muControl">break-unless</span> sandbox-in-focus?
+<span id="L104" class="LineNr">104 </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="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> render?
+<span id="L106" class="LineNr">106 </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#L121'>render</a>
+<span id="L107" class="LineNr">107 </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> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<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="muControl">loop</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Delimiter">}</span>
+<span id="L112" class="LineNr">112 </span>]
+<span id="L113" class="LineNr">113 </span>
+<span id="L114" class="LineNr">114 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L114'>resize</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment<span class="muRecipe"> -&gt; </span>env:&amp;:environment, <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
+<span id="L115" class="LineNr">115 </span>  <span class="Constant">local-scope</span>
+<span id="L116" class="LineNr">116 </span>  <span class="Constant">load-ingredients</span>
+<span id="L117" class="LineNr">117 </span>  <a href='../081print.mu.html#L27'>clear-screen</a> <a href='../081print.mu.html#L4'>screen</a>  <span class="Comment"># update screen dimensions</span>
+<span id="L118" class="LineNr">118 </span>  width:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L574'>screen-width</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L119" class="LineNr">119 </span>  divider:num, _ <span class="Special">&lt;-</span> divide-with-remainder width,<span class="Constant"> 2</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Comment"># update recipe editor</span>
+<span id="L121" class="LineNr">121 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L122" class="LineNr">122 </span>  right:num <span class="Special">&lt;-</span> subtract divider,<span class="Constant"> 1</span>
+<span id="L123" class="LineNr">123 </span>  *recipes <span class="Special">&lt;-</span> put *recipes, <span class="Constant">right:offset</span>, right
+<span id="L124" class="LineNr">124 </span>  <span class="Comment"># reset cursor (later we'll try to preserve its position)</span>
+<span id="L125" class="LineNr">125 </span>  *recipes <span class="Special">&lt;-</span> put *recipes, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 1</span>
+<span id="L126" class="LineNr">126 </span>  *recipes <span class="Special">&lt;-</span> put *recipes, <span class="Constant">cursor-column:offset</span>,<span class="Constant"> 0</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Comment"># update sandbox editor</span>
+<span id="L128" class="LineNr">128 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L129" class="LineNr">129 </span>  left:num <span class="Special">&lt;-</span> add divider,<span class="Constant"> 1</span>
+<span id="L130" class="LineNr">130 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">left:offset</span>, left
+<span id="L131" class="LineNr">131 </span>  right:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 1</span>
+<span id="L132" class="LineNr">132 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">right:offset</span>, right
+<span id="L133" class="LineNr">133 </span>  <span class="Comment"># reset cursor (later we'll try to preserve its position)</span>
+<span id="L134" class="LineNr">134 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 1</span>
+<span id="L135" class="LineNr">135 </span>  *current-sandbox <span class="Special">&lt;-</span> put *current-sandbox, <span class="Constant">cursor-column:offset</span>, left
+<span id="L136" class="LineNr">136 </span>]
+<span id="L137" class="LineNr">137 </span>
+<span id="L138" class="LineNr">138 </span><span class="Comment"># Variant of 'render' that updates cursor-row and cursor-column based on</span>
+<span id="L139" class="LineNr">139 </span><span class="Comment"># before-cursor (rather than the other way around). If before-cursor moves</span>
+<span id="L140" class="LineNr">140 </span><span class="Comment"># off-screen, it resets cursor-row and cursor-column.</span>
+<span id="L141" class="LineNr">141 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L141'>render-without-moving-cursor</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, editor:&amp;:editor<span class="muRecipe"> -&gt; </span>last-row:num, last-column:num, <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, editor:&amp;:editor [
+<span id="L142" class="LineNr">142 </span>  <span class="Constant">local-scope</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Constant">load-ingredients</span>
+<span id="L144" class="LineNr">144 </span>  <span class="muControl">return-unless</span> editor, <span class="Constant">1/top</span>, <span class="Constant">0/left</span>
+<span id="L145" class="LineNr">145 </span>  left:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">left:offset</span>
+<span id="L146" class="LineNr">146 </span>  <a href='../081print.mu.html#L587'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L587'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L147" class="LineNr">147 </span>  right:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">right:offset</span>
+<span id="L148" class="LineNr">148 </span>  curr:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L149" class="LineNr">149 </span>  <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> copy curr  <span class="Comment"># just in case curr becomes null and we can't compute prev</span>
+<span id="L150" class="LineNr">150 </span>  curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L151" class="LineNr">151 </span>  color:num <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
+<span id="L152" class="LineNr">152 </span>  row:num <span class="Special">&lt;-</span> copy <span class="Constant">1/top</span>
+<span id="L153" class="LineNr">153 </span>  column:num <span class="Special">&lt;-</span> copy left
+<span id="L154" class="LineNr">154 </span>  <span class="Comment"># save before-cursor</span>
+<span id="L155" class="LineNr">155 </span>  old-before-cursor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Comment"># initialze cursor-row/cursor-column/before-cursor to the top of the screen</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Comment"># by default</span>
+<span id="L158" class="LineNr">158 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, row
+<span id="L159" class="LineNr">159 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, column
+<span id="L160" class="LineNr">160 </span>  top-of-screen:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
+<span id="L161" class="LineNr">161 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, top-of-screen
+<span id="L162" class="LineNr">162 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L163" class="LineNr">163 </span>  <span class="Delimiter">{</span>
+<span id="L164" class="LineNr">164 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
+<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L587'>screen-height</a>
+<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> off-screen?
+<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Comment"># if we find old-before-cursor still on the new resized screen, update</span>
+<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Comment"># editor.cursor-row and editor.cursor-column based on</span>
+<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Comment"># old-before-cursor</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="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="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor?
+<span id="L174" class="LineNr">174 </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="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>, column
+<span id="L176" class="LineNr">176 </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="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
+<span id="L179" class="LineNr">179 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;character-c-received&gt;</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="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
+<span id="L182" class="LineNr">182 </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="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
+<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
+<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L401'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
+<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># skip to next line</span>
+<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L189" class="LineNr">189 </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#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L190" class="LineNr">190 </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="L191" class="LineNr">191 </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="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</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="Delimiter">{</span>
+<span id="L195" class="LineNr">195 </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="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># room for clicking on the cursor after it.</span>
+<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
+<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
+<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
+<span id="L200" class="LineNr">200 </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="L201" class="LineNr">201 </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="L202" class="LineNr">202 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L204" class="LineNr">204 </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#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
+<span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># don't increment curr</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
+<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
+<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
+<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
+<span id="L210" class="LineNr">210 </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="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
+<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L213" class="LineNr">213 </span>  <span class="Delimiter">}</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Comment"># save first character off-screen</span>
+<span id="L215" class="LineNr">215 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom-of-screen:offset</span>, curr
+<span id="L216" class="LineNr">216 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom:offset</span>, row
+<span id="L217" class="LineNr">217 </span>  <span class="muControl">return</span> row, column
+<span id="L218" class="LineNr">218 </span>]
+<span id="L219" class="LineNr">219 </span>
+<span id="L220" class="LineNr">220 </span><span class="muScenario">scenario</span> point-at-multiple-editors [
+<span id="L221" class="LineNr">221 </span>  <span class="Constant">local-scope</span>
+<span id="L222" class="LineNr">222 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L223" class="LineNr">223 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
+<span id="L224" class="LineNr">224 </span>  <span class="Comment"># initialize both halves of screen</span>
+<span id="L225" class="LineNr">225 </span>  assume-resources [
+<span id="L226" class="LineNr">226 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L227" class="LineNr">227 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> ]
+<span id="L229" class="LineNr">229 </span>  ]
+<span id="L230" class="LineNr">230 </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="L231" class="LineNr">231 </span>  <span class="Comment"># focus on both sides</span>
+<span id="L232" class="LineNr">232 </span>  assume-console [
+<span id="L233" class="LineNr">233 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
+<span id="L235" class="LineNr">235 </span>  ]
+<span id="L236" class="LineNr">236 </span>  <span class="Comment"># check cursor column in each</span>
+<span id="L237" class="LineNr">237 </span>  run [
+<span id="L238" class="LineNr">238 </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="L239" class="LineNr">239 </span>  <span class="Conceal">¦</span> recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L240" class="LineNr">240 </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="L241" class="LineNr">241 </span>  <span class="Conceal">¦</span> sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L242" class="LineNr">242 </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="L243" class="LineNr">243 </span>  ]
+<span id="L244" class="LineNr">244 </span>  memory-should-contain [
+<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span><span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>
+<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 17</span>
+<span id="L247" class="LineNr">247 </span>  ]
+<span id="L248" class="LineNr">248 </span>]
+<span id="L249" class="LineNr">249 </span>
+<span id="L250" class="LineNr">250 </span><span class="muScenario">scenario</span> edit-multiple-editors [
+<span id="L251" class="LineNr">251 </span>  <span class="Constant">local-scope</span>
+<span id="L252" class="LineNr">252 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L253" class="LineNr">253 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
+<span id="L254" class="LineNr">254 </span>  <span class="Comment"># initialize both halves of screen</span>
+<span id="L255" class="LineNr">255 </span>  assume-resources [
+<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L257" class="LineNr">257 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L258" class="LineNr">258 </span>  <span class="Conceal">¦</span> ]
+<span id="L259" class="LineNr">259 </span>  ]
+<span id="L260" class="LineNr">260 </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="L261" class="LineNr">261 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L262" class="LineNr">262 </span>  <span class="Comment"># type one letter in each of them</span>
+<span id="L263" class="LineNr">263 </span>  assume-console [
+<span id="L264" class="LineNr">264 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Conceal">¦</span> type <span class="Constant">[0]</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> type <span class="Constant">[1]</span>
+<span id="L268" class="LineNr">268 </span>  ]
+<span id="L269" class="LineNr">269 </span>  run [
+<span id="L270" class="LineNr">270 </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="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span> recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L272" class="LineNr">272 </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="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span> sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L274" class="LineNr">274 </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="L275" class="LineNr">275 </span>  ]
+<span id="L276" class="LineNr">276 </span>  screen-should-contain [
+<span id="L277" class="LineNr">277 </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="L278" class="LineNr">278 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc           ╎d1ef          .</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"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
+<span id="L281" class="LineNr">281 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
+<span id="L282" class="LineNr">282 </span>  ]
+<span id="L283" class="LineNr">283 </span>  memory-should-contain [
+<span id="L284" class="LineNr">284 </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="L285" class="LineNr">285 </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="L286" class="LineNr">286 </span>  ]
+<span id="L287" class="LineNr">287 </span>  <span class="Comment"># show the cursor at the right window</span>
+<span id="L288" class="LineNr">288 </span>  run [
+<span id="L289" class="LineNr">289 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L290" class="LineNr">290 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L291" class="LineNr">291 </span>  ]
+<span id="L292" class="LineNr">292 </span>  screen-should-contain [
+<span id="L293" class="LineNr">293 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L294" class="LineNr">294 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc           ╎d1␣f          .</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 class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
+<span id="L298" class="LineNr">298 </span>  ]
+<span id="L299" class="LineNr">299 </span>]
+<span id="L300" class="LineNr">300 </span>
+<span id="L301" class="LineNr">301 </span><span class="muScenario">scenario</span> editor-in-focus-keeps-cursor [
+<span id="L302" class="LineNr">302 </span>  <span class="Constant">local-scope</span>
+<span id="L303" class="LineNr">303 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L304" class="LineNr">304 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
+<span id="L305" class="LineNr">305 </span>  assume-resources [
+<span id="L306" class="LineNr">306 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L307" class="LineNr">307 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
+<span id="L308" class="LineNr">308 </span>  <span class="Conceal">¦</span> ]
+<span id="L309" class="LineNr">309 </span>  ]
+<span id="L310" class="LineNr">310 </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="L311" class="LineNr">311 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L312" class="LineNr">312 </span>  <span class="Comment"># initialize programming environment and highlight cursor</span>
+<span id="L313" class="LineNr">313 </span>  assume-console <span class="Constant">[]</span>
+<span id="L314" class="LineNr">314 </span>  run [
+<span id="L315" class="LineNr">315 </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="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L318" class="LineNr">318 </span>  ]
+<span id="L319" class="LineNr">319 </span>  <span class="Comment"># is cursor at the right place?</span>
+<span id="L320" class="LineNr">320 </span>  screen-should-contain [
+<span id="L321" class="LineNr">321 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣bc            ╎def           .</span>
+<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
+<span id="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
+<span id="L326" class="LineNr">326 </span>  ]
+<span id="L327" class="LineNr">327 </span>  <span class="Comment"># now try typing a letter</span>
+<span id="L328" class="LineNr">328 </span>  assume-console [
+<span id="L329" class="LineNr">329 </span>  <span class="Conceal">¦</span> type <span class="Constant">[z]</span>
+<span id="L330" class="LineNr">330 </span>  ]
+<span id="L331" class="LineNr">331 </span>  run [
+<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> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
 <span id="L335" class="LineNr">335 </span>  ]
-<span id="L336" class="LineNr">336 </span>  <span class="Comment"># show the cursor at the right window</span>
-<span id="L337" class="LineNr">337 </span>  run [
-<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L340" class="LineNr">340 </span>  ]
-<span id="L341" class="LineNr">341 </span>  screen-should-contain [
-<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
-<span id="L343" class="LineNr">343 </span>  <span class="Conceal">¦</span><span class="Constant"> .a0bc           ╎d1␣f          .</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 id="L349" class="LineNr">349 </span>
-<span id="L350" class="LineNr">350 </span><span class="muScenario">scenario</span> editor-in-focus-keeps-cursor [
-<span id="L351" class="LineNr">351 </span>  <span class="Constant">local-scope</span>
-<span id="L352" class="LineNr">352 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L353" class="LineNr">353 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
-<span id="L354" class="LineNr">354 </span>  assume-resources [
-<span id="L355" class="LineNr">355 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L356" class="LineNr">356 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> </span><span class="Conceal">¦</span><span class="Constant"> |abc|</span>
-<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> ]
-<span id="L358" class="LineNr">358 </span>  ]
-<span id="L359" class="LineNr">359 </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="L360" class="LineNr">360 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L361" class="LineNr">361 </span>  <span class="Comment"># initialize programming environment and highlight cursor</span>
-<span id="L362" class="LineNr">362 </span>  assume-console <span class="Constant">[]</span>
-<span id="L363" class="LineNr">363 </span>  run [
-<span id="L364" class="LineNr">364 </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="L365" class="LineNr">365 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L367" class="LineNr">367 </span>  ]
-<span id="L368" class="LineNr">368 </span>  <span class="Comment"># is cursor at the right place?</span>
-<span id="L369" class="LineNr">369 </span>  screen-should-contain [
-<span id="L370" class="LineNr">370 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
-<span id="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣bc            ╎def           .</span>
-<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
-<span id="L373" class="LineNr">373 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎              .</span>
-<span id="L374" class="LineNr">374 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
-<span id="L375" class="LineNr">375 </span>  ]
-<span id="L376" class="LineNr">376 </span>  <span class="Comment"># now try typing a letter</span>
-<span id="L377" class="LineNr">377 </span>  assume-console [
-<span id="L378" class="LineNr">378 </span>  <span class="Conceal">¦</span> type <span class="Constant">[z]</span>
-<span id="L379" class="LineNr">379 </span>  ]
-<span id="L380" class="LineNr">380 </span>  run [
-<span id="L381" class="LineNr">381 </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="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L383" class="LineNr">383 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L384" class="LineNr">384 </span>  ]
-<span id="L385" class="LineNr">385 </span>  <span class="Comment"># cursor should still be right</span>
-<span id="L386" class="LineNr">386 </span>  screen-should-contain [
-<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
-<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span><span class="Constant"> .z␣bc           ╎def           .</span>
-<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</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>]
-<span id="L394" class="LineNr">394 </span>
-<span id="L395" class="LineNr">395 </span><span class="muScenario">scenario</span> backspace-in-sandbox-editor-joins-lines [
-<span id="L396" class="LineNr">396 </span>  <span class="Constant">local-scope</span>
-<span id="L397" class="LineNr">397 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L398" class="LineNr">398 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
-<span id="L399" class="LineNr">399 </span>  assume-resources [
-<span id="L400" class="LineNr">400 </span>  ]
-<span id="L401" class="LineNr">401 </span>  <span class="Comment"># initialize sandbox side with two lines</span>
-<span id="L402" class="LineNr">402 </span>  test-sandbox-editor-contents:text <span class="Special">&lt;-</span> new <span class="Constant">[abc</span>
-<span id="L403" class="LineNr">403 </span><span class="Constant">def]</span>
-<span id="L404" class="LineNr">404 </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="L405" class="LineNr">405 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L406" class="LineNr">406 </span>  screen-should-contain [
-<span id="L407" class="LineNr">407 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
-<span id="L408" class="LineNr">408 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎abc           .</span>
-<span id="L409" class="LineNr">409 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎def           .</span>
-<span id="L410" class="LineNr">410 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
-<span id="L411" class="LineNr">411 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
-<span id="L412" class="LineNr">412 </span>  ]
-<span id="L413" class="LineNr">413 </span>  <span class="Comment"># position cursor at start of second line and hit backspace</span>
-<span id="L414" class="LineNr">414 </span>  assume-console [
-<span id="L415" class="LineNr">415 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 16</span>
-<span id="L416" class="LineNr">416 </span>  <span class="Conceal">¦</span> press backspace
-<span id="L417" class="LineNr">417 </span>  ]
-<span id="L418" class="LineNr">418 </span>  run [
-<span id="L419" class="LineNr">419 </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="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L422" class="LineNr">422 </span>  ]
-<span id="L423" class="LineNr">423 </span>  <span class="Comment"># cursor moves to end of old line</span>
-<span id="L424" class="LineNr">424 </span>  screen-should-contain [
-<span id="L425" class="LineNr">425 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
-<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎abc␣ef        .</span>
-<span id="L427" class="LineNr">427 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎──────────────.</span>
-<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
-<span id="L429" class="LineNr">429 </span>  ]
-<span id="L430" class="LineNr">430 </span>]
-<span id="L431" class="LineNr">431 </span>
-<span id="L432" class="LineNr">432 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment [
-<span id="L433" class="LineNr">433 </span>  <span class="Constant">local-scope</span>
-<span id="L434" class="LineNr">434 </span>  <span class="Constant">load-ingredients</span>
-<span id="L435" class="LineNr">435 </span>  trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[render all]</span>
-<span id="L436" class="LineNr">436 </span>  <span class="Comment"># top menu</span>
-<span id="L437" class="LineNr">437 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render top menu]</span>
-<span id="L438" class="LineNr">438 </span>  width:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L574'>screen-width</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L439" class="LineNr">439 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>,<span class="Constant"> 0</span>, <span class="Constant">0/left</span>, width, <span class="Constant">32/space</span>, <span class="Constant">0/black</span>, <span class="Constant">238/grey</span>
-<span id="L440" class="LineNr">440 </span>  button-start:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 20</span>
-<span id="L441" class="LineNr">441 </span>  button-on-screen?:bool <span class="Special">&lt;-</span> greater-or-equal button-start,<span class="Constant"> 0</span>
-<span id="L442" class="LineNr">442 </span>  assert button-on-screen?, <span class="Constant">[screen too narrow for menu]</span>
-<span id="L443" class="LineNr">443 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">0/row</span>, button-start
-<span id="L444" class="LineNr">444 </span>  print <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[ run (F4) ]</span>, <span class="Constant">255/white</span>, <span class="Constant">161/reddish</span>
-<span id="L445" class="LineNr">445 </span>  <span class="Comment"># dotted line down the middle</span>
-<span id="L446" class="LineNr">446 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render divider]</span>
-<span id="L447" class="LineNr">447 </span>  divider:num, _ <span class="Special">&lt;-</span> divide-with-remainder width,<span class="Constant"> 2</span>
-<span id="L448" class="LineNr">448 </span>  height:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L587'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
-<span id="L449" class="LineNr">449 </span>  <a href='004-programming-environment.mu.html#L529'>draw-vertical</a> <a href='../081print.mu.html#L4'>screen</a>, divider, <span class="Constant">1/top</span>, height, <span class="Constant">9482/vertical-dotted</span>
-<span id="L450" class="LineNr">450 </span>  <span class="Comment">#</span>
-<span id="L451" class="LineNr">451 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L461'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>, env, render-editor
-<span id="L452" class="LineNr">452 </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, render-editor
-<span id="L453" class="LineNr">453 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L453'>&lt;render-components-end&gt;</a></span>
-<span id="L454" class="LineNr">454 </span>  <span class="Comment">#</span>
-<span id="L455" class="LineNr">455 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L456" class="LineNr">456 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L457" class="LineNr">457 </span>  sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
-<span id="L458" class="LineNr">458 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L459" class="LineNr">459 </span>]
-<span id="L460" class="LineNr">460 </span>
-<span id="L461" class="LineNr">461 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L461'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment [
-<span id="L462" class="LineNr">462 </span>  <span class="Constant">local-scope</span>
-<span id="L463" class="LineNr">463 </span>  <span class="Constant">load-ingredients</span>
-<span id="L464" class="LineNr">464 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render recipes]</span>
-<span id="L465" class="LineNr">465 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
-<span id="L466" class="LineNr">466 </span>  <span class="Comment"># render recipes</span>
-<span id="L467" class="LineNr">467 </span>  left:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">left:offset</span>
-<span id="L468" class="LineNr">468 </span>  right:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">right:offset</span>
-<span id="L469" class="LineNr">469 </span>  row:num, column:num, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> call render-editor, <a href='../081print.mu.html#L4'>screen</a>, recipes
-<span id="L470" class="LineNr">470 </span>  <a href='../081print.mu.html#L401'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
-<span id="L471" class="LineNr">471 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L472" class="LineNr">472 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L472'>&lt;render-recipe-components-end&gt;</a></span>
-<span id="L473" class="LineNr">473 </span>  <span class="Comment"># draw dotted line after recipes</span>
-<span id="L474" class="LineNr">474 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right, <span class="Constant">9480/horizontal-dotted</span>
-<span id="L475" class="LineNr">475 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L476" class="LineNr">476 </span>  <a href='001-editor.mu.html#L221'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, left, right
-<span id="L477" class="LineNr">477 </span>]
-<span id="L478" class="LineNr">478 </span>
-<span id="L479" class="LineNr">479 </span><span class="Comment"># replaced in a later layer</span>
-<span id="L480" class="LineNr">480 </span><span class="muRecipe">def</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment [
+<span id="L336" class="LineNr">336 </span>  <span class="Comment"># cursor should still be right</span>
+<span id="L337" class="LineNr">337 </span>  screen-should-contain [
+<span id="L338" class="LineNr">338 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span><span class="Constant"> .z␣bc           ╎def           .</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 id="L344" class="LineNr">344 </span>]
+<span id="L345" class="LineNr">345 </span>
+<span id="L346" class="LineNr">346 </span><span class="muScenario">scenario</span> backspace-in-sandbox-editor-joins-lines [
+<span id="L347" class="LineNr">347 </span>  <span class="Constant">local-scope</span>
+<span id="L348" class="LineNr">348 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L349" class="LineNr">349 </span>  assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
+<span id="L350" class="LineNr">350 </span>  assume-resources [
+<span id="L351" class="LineNr">351 </span>  ]
+<span id="L352" class="LineNr">352 </span>  <span class="Comment"># initialize sandbox side with two lines</span>
+<span id="L353" class="LineNr">353 </span>  test-sandbox-editor-contents:text <span class="Special">&lt;-</span> new <span class="Constant">[abc</span>
+<span id="L354" class="LineNr">354 </span><span class="Constant">def]</span>
+<span id="L355" class="LineNr">355 </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="L356" class="LineNr">356 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L357" class="LineNr">357 </span>  screen-should-contain [
+<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎abc           .</span>
+<span id="L360" class="LineNr">360 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎def           .</span>
+<span id="L361" class="LineNr">361 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎──────────────.</span>
+<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
+<span id="L363" class="LineNr">363 </span>  ]
+<span id="L364" class="LineNr">364 </span>  <span class="Comment"># position cursor at start of second line and hit backspace</span>
+<span id="L365" class="LineNr">365 </span>  assume-console [
+<span id="L366" class="LineNr">366 </span>  <span class="Conceal">¦</span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 16</span>
+<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span> press backspace
+<span id="L368" class="LineNr">368 </span>  ]
+<span id="L369" class="LineNr">369 </span>  run [
+<span id="L370" class="LineNr">370 </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="L371" class="LineNr">371 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L372" class="LineNr">372 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L373" class="LineNr">373 </span>  ]
+<span id="L374" class="LineNr">374 </span>  <span class="Comment"># cursor moves to end of old line</span>
+<span id="L375" class="LineNr">375 </span>  screen-should-contain [
+<span id="L376" class="LineNr">376 </span>  <span class="Conceal">¦</span><span class="Constant"> .           run (F4)           .</span>
+<span id="L377" class="LineNr">377 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎abc␣ef        .</span>
+<span id="L378" class="LineNr">378 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎──────────────.</span>
+<span id="L379" class="LineNr">379 </span>  <span class="Conceal">¦</span><span class="Constant"> .               ╎              .</span>
+<span id="L380" class="LineNr">380 </span>  ]
+<span id="L381" class="LineNr">381 </span>]
+<span id="L382" class="LineNr">382 </span>
+<span id="L383" class="LineNr">383 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment [
+<span id="L384" class="LineNr">384 </span>  <span class="Constant">local-scope</span>
+<span id="L385" class="LineNr">385 </span>  <span class="Constant">load-ingredients</span>
+<span id="L386" class="LineNr">386 </span>  trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[render all]</span>
+<span id="L387" class="LineNr">387 </span>  <span class="Comment"># top menu</span>
+<span id="L388" class="LineNr">388 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render top menu]</span>
+<span id="L389" class="LineNr">389 </span>  width:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L574'>screen-width</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L390" class="LineNr">390 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>,<span class="Constant"> 0</span>, <span class="Constant">0/left</span>, width, <span class="Constant">32/space</span>, <span class="Constant">0/black</span>, <span class="Constant">238/grey</span>
+<span id="L391" class="LineNr">391 </span>  button-start:num <span class="Special">&lt;-</span> subtract width,<span class="Constant"> 20</span>
+<span id="L392" class="LineNr">392 </span>  button-on-screen?:bool <span class="Special">&lt;-</span> greater-or-equal button-start,<span class="Constant"> 0</span>
+<span id="L393" class="LineNr">393 </span>  assert button-on-screen?, <span class="Constant">[screen too narrow for menu]</span>
+<span id="L394" class="LineNr">394 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">0/row</span>, button-start
+<span id="L395" class="LineNr">395 </span>  print <a href='../081print.mu.html#L4'>screen</a>, <span class="Constant">[ run (F4) ]</span>, <span class="Constant">255/white</span>, <span class="Constant">161/reddish</span>
+<span id="L396" class="LineNr">396 </span>  <span class="Comment"># dotted line down the middle</span>
+<span id="L397" class="LineNr">397 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render divider]</span>
+<span id="L398" class="LineNr">398 </span>  divider:num, _ <span class="Special">&lt;-</span> divide-with-remainder width,<span class="Constant"> 2</span>
+<span id="L399" class="LineNr">399 </span>  height:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L587'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
+<span id="L400" class="LineNr">400 </span>  <a href='004-programming-environment.mu.html#L480'>draw-vertical</a> <a href='../081print.mu.html#L4'>screen</a>, divider, <span class="Constant">1/top</span>, height, <span class="Constant">9482/vertical-dotted</span>
+<span id="L401" class="LineNr">401 </span>  <span class="Comment">#</span>
+<span id="L402" class="LineNr">402 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L412'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>, env, render-editor
+<span id="L403" class="LineNr">403 </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, render-editor
+<span id="L404" class="LineNr">404 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L404'>&lt;render-components-end&gt;</a></span>
+<span id="L405" class="LineNr">405 </span>  <span class="Comment">#</span>
+<span id="L406" class="LineNr">406 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L407" class="LineNr">407 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L408" class="LineNr">408 </span>  sandbox-in-focus?:bool <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
+<span id="L409" class="LineNr">409 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L410" class="LineNr">410 </span>]
+<span id="L411" class="LineNr">411 </span>
+<span id="L412" class="LineNr">412 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L412'>render-recipes</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment [
+<span id="L413" class="LineNr">413 </span>  <span class="Constant">local-scope</span>
+<span id="L414" class="LineNr">414 </span>  <span class="Constant">load-ingredients</span>
+<span id="L415" class="LineNr">415 </span>  trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render recipes]</span>
+<span id="L416" class="LineNr">416 </span>  recipes:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">recipes:offset</span>
+<span id="L417" class="LineNr">417 </span>  <span class="Comment"># render recipes</span>
+<span id="L418" class="LineNr">418 </span>  left:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">left:offset</span>
+<span id="L419" class="LineNr">419 </span>  right:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">right:offset</span>
+<span id="L420" class="LineNr">420 </span>  row:num, column:num, <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> call render-editor, <a href='../081print.mu.html#L4'>screen</a>, recipes
+<span id="L421" class="LineNr">421 </span>  <a href='../081print.mu.html#L401'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
+<span id="L422" class="LineNr">422 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L423" class="LineNr">423 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L423'>&lt;render-recipe-components-end&gt;</a></span>
+<span id="L424" class="LineNr">424 </span>  <span class="Comment"># draw dotted line after recipes</span>
+<span id="L425" class="LineNr">425 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right, <span class="Constant">9480/horizontal-dotted</span>
+<span id="L426" class="LineNr">426 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L427" class="LineNr">427 </span>  <a href='001-editor.mu.html#L221'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, left, right
+<span id="L428" class="LineNr">428 </span>]
+<span id="L429" class="LineNr">429 </span>
+<span id="L430" class="LineNr">430 </span><span class="Comment"># replaced in a later layer</span>
+<span id="L431" class="LineNr">431 </span><span class="muRecipe">def</span> render-sandbox-side <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment, <span class="Delimiter">{</span>render-editor: (recipe (address screen) (address editor)<span class="muRecipe"> -&gt; </span>number number (address screen) (address editor))<span class="Delimiter">}</span><span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, env:&amp;:environment [
+<span id="L432" class="LineNr">432 </span>  <span class="Constant">local-scope</span>
+<span id="L433" class="LineNr">433 </span>  <span class="Constant">load-ingredients</span>
+<span id="L434" class="LineNr">434 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
+<span id="L435" class="LineNr">435 </span>  left:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+<span id="L436" class="LineNr">436 </span>  right:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">right:offset</span>
+<span id="L437" class="LineNr">437 </span>  row:num, column:num, <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="L438" class="LineNr">438 </span>  <a href='../081print.mu.html#L401'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
+<span id="L439" class="LineNr">439 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L440" class="LineNr">440 </span>  <span class="Comment"># draw solid line after code (you'll see why in later layers)</span>
+<span id="L441" class="LineNr">441 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right
+<span id="L442" class="LineNr">442 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
+<span id="L443" class="LineNr">443 </span>  <a href='001-editor.mu.html#L221'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, left, right
+<span id="L444" class="LineNr">444 </span>]
+<span id="L445" class="LineNr">445 </span>
+<span id="L446" class="LineNr">446 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, recipes:&amp;:editor, current-sandbox:&amp;:editor, sandbox-in-focus?:bool, env:&amp;:environment<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
+<span id="L447" class="LineNr">447 </span>  <span class="Constant">local-scope</span>
+<span id="L448" class="LineNr">448 </span>  <span class="Constant">load-ingredients</span>
+<span id="L449" class="LineNr">449 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L449'>&lt;update-cursor-special-cases&gt;</a></span>
+<span id="L450" class="LineNr">450 </span>  <span class="Delimiter">{</span>
+<span id="L451" class="LineNr">451 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
+<span id="L452" class="LineNr">452 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-row:offset</span>
+<span id="L453" class="LineNr">453 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
+<span id="L454" class="LineNr">454 </span>  <span class="Delimiter">}</span>
+<span id="L455" class="LineNr">455 </span>  <span class="Delimiter">{</span>
+<span id="L456" class="LineNr">456 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L457" class="LineNr">457 </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="L458" class="LineNr">458 </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="L459" class="LineNr">459 </span>  <span class="Delimiter">}</span>
+<span id="L460" class="LineNr">460 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
+<span id="L461" class="LineNr">461 </span>]
+<span id="L462" class="LineNr">462 </span>
+<span id="L463" class="LineNr">463 </span><span class="Comment"># ctrl-n - switch focus</span>
+<span id="L464" class="LineNr">464 </span><span class="Comment"># todo: test this</span>
+<span id="L465" class="LineNr">465 </span>
+<span id="L466" class="LineNr">466 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L62'>&lt;global-type&gt;</a></span> [
+<span id="L467" class="LineNr">467 </span>  <span class="Delimiter">{</span>
+<span id="L468" class="LineNr">468 </span>  <span class="Conceal">¦</span> switch-side?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">14/ctrl-n</span>
+<span id="L469" class="LineNr">469 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> switch-side?
+<span id="L470" class="LineNr">470 </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="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span> sandbox-in-focus? <span class="Special">&lt;-</span> not sandbox-in-focus?
+<span id="L472" class="LineNr">472 </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="L473" class="LineNr">473 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L475" class="LineNr">475 </span>  <span class="Delimiter">}</span>
+<span id="L476" class="LineNr">476 </span>]
+<span id="L477" class="LineNr">477 </span>
+<span id="L478" class="LineNr">478 </span><span class="SalientComment">## helpers</span>
+<span id="L479" class="LineNr">479 </span>
+<span id="L480" class="LineNr">480 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L480'>draw-vertical</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, col:num, y:num, bottom:num<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
 <span id="L481" class="LineNr">481 </span>  <span class="Constant">local-scope</span>
 <span id="L482" class="LineNr">482 </span>  <span class="Constant">load-ingredients</span>
-<span id="L483" class="LineNr">483 </span>  current-sandbox:&amp;:editor <span class="Special">&lt;-</span> get *env, <span class="Constant">current-sandbox:offset</span>
-<span id="L484" class="LineNr">484 </span>  left:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
-<span id="L485" class="LineNr">485 </span>  right:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">right:offset</span>
-<span id="L486" class="LineNr">486 </span>  row:num, column:num, <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="L487" class="LineNr">487 </span>  <a href='../081print.mu.html#L401'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
-<span id="L488" class="LineNr">488 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L489" class="LineNr">489 </span>  <span class="Comment"># draw solid line after code (you'll see why in later layers)</span>
-<span id="L490" class="LineNr">490 </span>  <a href='002-typing.mu.html#L1056'>draw-horizontal</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right
-<span id="L491" class="LineNr">491 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
-<span id="L492" class="LineNr">492 </span>  <a href='001-editor.mu.html#L221'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, left, right
-<span id="L493" class="LineNr">493 </span>]
-<span id="L494" class="LineNr">494 </span>
-<span id="L495" class="LineNr">495 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, recipes:&amp;:editor, current-sandbox:&amp;:editor, sandbox-in-focus?:bool, env:&amp;:environment<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
-<span id="L496" class="LineNr">496 </span>  <span class="Constant">local-scope</span>
-<span id="L497" class="LineNr">497 </span>  <span class="Constant">load-ingredients</span>
-<span id="L498" class="LineNr">498 </span><span class="Constant">  <a href='004-programming-environment.mu.html#L498'>&lt;update-cursor-special-cases&gt;</a></span>
-<span id="L499" class="LineNr">499 </span>  <span class="Delimiter">{</span>
-<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
-<span id="L501" class="LineNr">501 </span>  <span class="Conceal">¦</span> cursor-row:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-row:offset</span>
-<span id="L502" class="LineNr">502 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
-<span id="L503" class="LineNr">503 </span>  <span class="Delimiter">}</span>
-<span id="L504" class="LineNr">504 </span>  <span class="Delimiter">{</span>
-<span id="L505" class="LineNr">505 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L506" class="LineNr">506 </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="L507" class="LineNr">507 </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="L508" class="LineNr">508 </span>  <span class="Delimiter">}</span>
-<span id="L509" class="LineNr">509 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, cursor-row, cursor-column
-<span id="L510" class="LineNr">510 </span>]
-<span id="L511" class="LineNr">511 </span>
-<span id="L512" class="LineNr">512 </span><span class="Comment"># ctrl-n - switch focus</span>
-<span id="L513" class="LineNr">513 </span><span class="Comment"># todo: test this</span>
-<span id="L514" class="LineNr">514 </span>
-<span id="L515" class="LineNr">515 </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="L516" class="LineNr">516 </span>  <span class="Delimiter">{</span>
-<span id="L517" class="LineNr">517 </span>  <span class="Conceal">¦</span> switch-side?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">14/ctrl-n</span>
-<span id="L518" class="LineNr">518 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> switch-side?
-<span id="L519" class="LineNr">519 </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="L520" class="LineNr">520 </span>  <span class="Conceal">¦</span> sandbox-in-focus? <span class="Special">&lt;-</span> not sandbox-in-focus?
-<span id="L521" class="LineNr">521 </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="L522" class="LineNr">522 </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#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
-<span id="L523" class="LineNr">523 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
-<span id="L524" class="LineNr">524 </span>  <span class="Delimiter">}</span>
-<span id="L525" class="LineNr">525 </span>]
-<span id="L526" class="LineNr">526 </span>
-<span id="L527" class="LineNr">527 </span><span class="SalientComment">## helpers</span>
-<span id="L528" class="LineNr">528 </span>
-<span id="L529" class="LineNr">529 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L529'>draw-vertical</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, col:num, y:num, bottom:num<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
-<span id="L530" class="LineNr">530 </span>  <span class="Constant">local-scope</span>
-<span id="L531" class="LineNr">531 </span>  <span class="Constant">load-ingredients</span>
-<span id="L532" class="LineNr">532 </span>  style:char, style-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L533" class="LineNr">533 </span>  <span class="Delimiter">{</span>
-<span id="L534" class="LineNr">534 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> style-found?
-<span id="L535" class="LineNr">535 </span>  <span class="Conceal">¦</span> style <span class="Special">&lt;-</span> copy <span class="Constant">9474/vertical</span>
-<span id="L536" class="LineNr">536 </span>  <span class="Delimiter">}</span>
-<span id="L537" class="LineNr">537 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
-<span id="L538" class="LineNr">538 </span>  <span class="Delimiter">{</span>
-<span id="L539" class="LineNr">539 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
-<span id="L540" class="LineNr">540 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
-<span id="L541" class="LineNr">541 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
-<span id="L542" class="LineNr">542 </span>  <span class="Delimiter">}</span>
-<span id="L543" class="LineNr">543 </span>  <span class="Delimiter">{</span>
-<span id="L544" class="LineNr">544 </span>  <span class="Conceal">¦</span> continue?:bool <span class="Special">&lt;-</span> lesser-than y, bottom
-<span id="L545" class="LineNr">545 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> continue?
-<span id="L546" class="LineNr">546 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, y, col
-<span id="L547" class="LineNr">547 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, style, color
-<span id="L548" class="LineNr">548 </span>  <span class="Conceal">¦</span> y <span class="Special">&lt;-</span> add y,<span class="Constant"> 1</span>
-<span id="L549" class="LineNr">549 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
-<span id="L550" class="LineNr">550 </span>  <span class="Delimiter">}</span>
-<span id="L551" class="LineNr">551 </span>]
+<span id="L483" class="LineNr">483 </span>  style:char, style-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L484" class="LineNr">484 </span>  <span class="Delimiter">{</span>
+<span id="L485" class="LineNr">485 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> style-found?
+<span id="L486" class="LineNr">486 </span>  <span class="Conceal">¦</span> style <span class="Special">&lt;-</span> copy <span class="Constant">9474/vertical</span>
+<span id="L487" class="LineNr">487 </span>  <span class="Delimiter">}</span>
+<span id="L488" class="LineNr">488 </span>  color:num, color-found?:bool <span class="Special">&lt;-</span> <span class="Constant">next-ingredient</span>
+<span id="L489" class="LineNr">489 </span>  <span class="Delimiter">{</span>
+<span id="L490" class="LineNr">490 </span>  <span class="Conceal">¦</span> <span class="Comment"># default color to white</span>
+<span id="L491" class="LineNr">491 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> color-found?
+<span id="L492" class="LineNr">492 </span>  <span class="Conceal">¦</span> color <span class="Special">&lt;-</span> copy <span class="Constant">245/grey</span>
+<span id="L493" class="LineNr">493 </span>  <span class="Delimiter">}</span>
+<span id="L494" class="LineNr">494 </span>  <span class="Delimiter">{</span>
+<span id="L495" class="LineNr">495 </span>  <span class="Conceal">¦</span> continue?:bool <span class="Special">&lt;-</span> lesser-than y, bottom
+<span id="L496" class="LineNr">496 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> continue?
+<span id="L497" class="LineNr">497 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, y, col
+<span id="L498" class="LineNr">498 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, style, color
+<span id="L499" class="LineNr">499 </span>  <span class="Conceal">¦</span> y <span class="Special">&lt;-</span> add y,<span class="Constant"> 1</span>
+<span id="L500" class="LineNr">500 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L501" class="LineNr">501 </span>  <span class="Delimiter">}</span>
+<span id="L502" class="LineNr">502 </span>]
 </pre>
 </body>
 </html>
diff --git a/html/edit/005-sandbox.mu.html b/html/edit/005-sandbox.mu.html
index d5e2f517..cc3613d8 100644
--- a/html/edit/005-sandbox.mu.html
+++ b/html/edit/005-sandbox.mu.html
@@ -75,7 +75,7 @@ if ('onhashchange' in window) {
 <span id="L12" class="LineNr">  12 </span>  open-console
 <span id="L13" class="LineNr">  13 </span>  env:&amp;:environment <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <span class="Constant">0/filesystem</span>, <span class="Constant">0/screen</span>
 <span id="L14" class="LineNr">  14 </span>  env <span class="Special">&lt;-</span> <a href='005-sandbox.mu.html#L504'>restore-sandboxes</a> env
-<span id="L15" class="LineNr">  15 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <span class="Constant">0/screen</span>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L15" class="LineNr">  15 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <span class="Constant">0/screen</span>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L16" class="LineNr">  16 </span>  <a href='004-programming-environment.mu.html#L39'>event-loop</a> <span class="Constant">0/screen</span>, <span class="Constant">0/console</span>, env, <span class="Constant">0/filesystem</span>
 <span id="L17" class="LineNr">  17 </span>  <span class="Comment"># never gets here</span>
 <span id="L18" class="LineNr">  18 </span>]
@@ -185,7 +185,7 @@ if ('onhashchange' in window) {
 <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="L125" class="LineNr"> 125 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L57'>&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>  <span class="Conceal">¦</span> do-run?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65532/F4</span>
@@ -193,12 +193,12 @@ if ('onhashchange' in window) {
 <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#L213'>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#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>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#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>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#L213'>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#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<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#L446'>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>]
@@ -802,7 +802,7 @@ if ('onhashchange' in window) {
 <span id="L739" class="LineNr"> 739 </span>  assume-resources [
 <span id="L740" class="LineNr"> 740 </span>  ]
 <span id="L741" class="LineNr"> 741 </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="L742" class="LineNr"> 742 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L742" class="LineNr"> 742 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L743" class="LineNr"> 743 </span>  assume-console [
 <span id="L744" class="LineNr"> 744 </span>  <span class="Conceal">¦</span> press enter
 <span id="L745" class="LineNr"> 745 </span>  <span class="Conceal">¦</span> press down-arrow
@@ -825,7 +825,7 @@ if ('onhashchange' in window) {
 <span id="L762" class="LineNr"> 762 </span>  assume-resources [
 <span id="L763" class="LineNr"> 763 </span>  ]
 <span id="L764" class="LineNr"> 764 </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="L765" class="LineNr"> 765 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L765" class="LineNr"> 765 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L766" class="LineNr"> 766 </span>  assume-console [
 <span id="L767" class="LineNr"> 767 </span>  <span class="Conceal">¦</span> press enter
 <span id="L768" class="LineNr"> 768 </span>  <span class="Conceal">¦</span> press up-arrow
@@ -851,11 +851,11 @@ if ('onhashchange' in window) {
 <span id="L788" class="LineNr"> 788 </span>  recipe-bottom:num
 <span id="L789" class="LineNr"> 789 </span>]
 <span id="L790" class="LineNr"> 790 </span>
-<span id="L791" class="LineNr"> 791 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L472'>&lt;render-recipe-components-end&gt;</a></span> [
+<span id="L791" class="LineNr"> 791 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L423'>&lt;render-recipe-components-end&gt;</a></span> [
 <span id="L792" class="LineNr"> 792 </span>  *env <span class="Special">&lt;-</span> put *env, <span class="Constant">recipe-bottom:offset</span>, row
 <span id="L793" class="LineNr"> 793 </span>]
 <span id="L794" class="LineNr"> 794 </span>
-<span id="L795" class="LineNr"> 795 </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="L795" class="LineNr"> 795 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L57'>&lt;global-keypress&gt;</a></span> [
 <span id="L796" class="LineNr"> 796 </span>  <span class="Delimiter">{</span>
 <span id="L797" class="LineNr"> 797 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
 <span id="L798" class="LineNr"> 798 </span>  <span class="Conceal">¦</span> down-arrow?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65516/down-arrow</span>
@@ -879,7 +879,7 @@ if ('onhashchange' in window) {
 <span id="L816" class="LineNr"> 816 </span>  <span class="Delimiter">}</span>
 <span id="L817" class="LineNr"> 817 </span>]
 <span id="L818" class="LineNr"> 818 </span>
-<span id="L819" class="LineNr"> 819 </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="L819" class="LineNr"> 819 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L62'>&lt;global-type&gt;</a></span> [
 <span id="L820" class="LineNr"> 820 </span>  <span class="Delimiter">{</span>
 <span id="L821" class="LineNr"> 821 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> sandbox-in-focus?
 <span id="L822" class="LineNr"> 822 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">6/ctrl-f</span>
@@ -905,7 +905,7 @@ if ('onhashchange' in window) {
 <span id="L842" class="LineNr"> 842 </span>  assume-resources [
 <span id="L843" class="LineNr"> 843 </span>  ]
 <span id="L844" class="LineNr"> 844 </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="L845" class="LineNr"> 845 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L845" class="LineNr"> 845 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L846" class="LineNr"> 846 </span>  assume-console [
 <span id="L847" class="LineNr"> 847 </span>  <span class="Conceal">¦</span> <span class="Comment"># add a line</span>
 <span id="L848" class="LineNr"> 848 </span>  <span class="Conceal">¦</span> press enter
@@ -933,7 +933,7 @@ if ('onhashchange' in window) {
 <span id="L870" class="LineNr"> 870 </span>  ]
 <span id="L871" class="LineNr"> 871 </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">[ab</span>
 <span id="L872" class="LineNr"> 872 </span><span class="Constant">cd]</span>
-<span id="L873" class="LineNr"> 873 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L873" class="LineNr"> 873 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L874" class="LineNr"> 874 </span>  assume-console [
 <span id="L875" class="LineNr"> 875 </span>  <span class="Conceal">¦</span> <span class="Comment"># add a line</span>
 <span id="L876" class="LineNr"> 876 </span>  <span class="Conceal">¦</span> press enter
@@ -965,7 +965,7 @@ if ('onhashchange' in window) {
 <span id="L902" class="LineNr"> 902 </span>  assume-resources [
 <span id="L903" class="LineNr"> 903 </span>  ]
 <span id="L904" class="LineNr"> 904 </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="L905" class="LineNr"> 905 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L905" class="LineNr"> 905 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L906" class="LineNr"> 906 </span>  assume-console [
 <span id="L907" class="LineNr"> 907 </span>  <span class="Conceal">¦</span> <span class="Comment"># create a sandbox</span>
 <span id="L908" class="LineNr"> 908 </span>  <span class="Conceal">¦</span> press F4
@@ -1017,7 +1017,7 @@ if ('onhashchange' in window) {
 <span id="L954" class="LineNr"> 954 </span>]
 <span id="L955" class="LineNr"> 955 </span>
 <span id="L956" class="LineNr"> 956 </span><span class="Comment"># page-down on sandbox side updates render-from to scroll sandboxes</span>
-<span id="L957" class="LineNr"> 957 </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="L957" class="LineNr"> 957 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L57'>&lt;global-keypress&gt;</a></span> [
 <span id="L958" class="LineNr"> 958 </span>  <span class="Delimiter">{</span>
 <span id="L959" class="LineNr"> 959 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
 <span id="L960" class="LineNr"> 960 </span>  <span class="Conceal">¦</span> page-down?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65518/page-down</span>
@@ -1030,333 +1030,335 @@ if ('onhashchange' in window) {
 <span id="L967" class="LineNr"> 967 </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="L968" class="LineNr"> 968 </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="L969" class="LineNr"> 969 </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="L970" class="LineNr"> 970 </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="L970" class="LineNr"> 970 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop-if</span> at-end?, <span class="Constant">+next-event</span>  <span class="Comment"># render nothing</span>
 <span id="L971" class="LineNr"> 971 </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="L972" class="LineNr"> 972 </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="L973" class="LineNr"> 973 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
 <span id="L974" class="LineNr"> 974 </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#L121'>render</a>
-<span id="L975" class="LineNr"> 975 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L976" class="LineNr"> 976 </span>  <span class="Delimiter">}</span>
-<span id="L977" class="LineNr"> 977 </span>]
-<span id="L978" class="LineNr"> 978 </span>
-<span id="L979" class="LineNr"> 979 </span><span class="Comment"># update-cursor takes render-from into account</span>
-<span id="L980" class="LineNr"> 980 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L498'>&lt;update-cursor-special-cases&gt;</a></span> [
-<span id="L981" class="LineNr"> 981 </span>  <span class="Delimiter">{</span>
-<span id="L982" class="LineNr"> 982 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L983" class="LineNr"> 983 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
-<span id="L984" class="LineNr"> 984 </span>  <span class="Conceal">¦</span> scrolling?:bool <span class="Special">&lt;-</span> greater-or-equal render-from,<span class="Constant"> 0</span>
-<span id="L985" class="LineNr"> 985 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> scrolling?
-<span id="L986" class="LineNr"> 986 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
-<span id="L987" class="LineNr"> 987 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>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="L988" class="LineNr"> 988 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
-<span id="L989" class="LineNr"> 989 </span>  <span class="Delimiter">}</span>
-<span id="L990" class="LineNr"> 990 </span>]
-<span id="L991" class="LineNr"> 991 </span>
-<span id="L992" class="LineNr"> 992 </span><span class="Comment"># 'page-up' on sandbox side is like 'page-down': updates render-from when necessary</span>
-<span id="L993" class="LineNr"> 993 </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="L994" class="LineNr"> 994 </span>  <span class="Delimiter">{</span>
-<span id="L995" class="LineNr"> 995 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
-<span id="L996" class="LineNr"> 996 </span>  <span class="Conceal">¦</span> page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
-<span id="L997" class="LineNr"> 997 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-up?
-<span id="L998" class="LineNr"> 998 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
-<span id="L999" class="LineNr"> 999 </span>  <span class="Conceal">¦</span> at-beginning?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
-<span id="L1000" class="LineNr">1000 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-beginning?
-<span id="L1001" class="LineNr">1001 </span>  <span class="Conceal">¦</span> render-from <span class="Special">&lt;-</span> subtract render-from,<span class="Constant"> 1</span>
-<span id="L1002" class="LineNr">1002 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
-<span id="L1003" class="LineNr">1003 </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#L121'>render</a>
-<span id="L1004" class="LineNr">1004 </span>  <span class="Conceal">¦</span> <span class="muControl">jump</span> <span class="Constant">+finish-event</span>
-<span id="L1005" class="LineNr">1005 </span>  <span class="Delimiter">}</span>
-<span id="L1006" class="LineNr">1006 </span>]
-<span id="L1007" class="LineNr">1007 </span>
-<span id="L1008" class="LineNr">1008 </span><span class="Comment"># sandbox belonging to 'env' whose next-sandbox is 'in'</span>
-<span id="L1009" class="LineNr">1009 </span><span class="Comment"># return 0 if there's no such sandbox, either because 'in' doesn't exist in 'env', or because it's the first sandbox</span>
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-<span id="L1011" class="LineNr">1011 </span>  <span class="Constant">local-scope</span>
-<span id="L1012" class="LineNr">1012 </span>  <span class="Constant">load-ingredients</span>
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-<span id="L1014" class="LineNr">1014 </span>  <span class="muControl">return-unless</span> curr, <span class="Constant">0/nil</span>
-<span id="L1015" class="LineNr">1015 </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="L1016" class="LineNr">1016 </span>  <span class="Delimiter">{</span>
-<span id="L1017" class="LineNr">1017 </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="L1018" class="LineNr">1018 </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="L1019" class="LineNr">1019 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
-<span id="L1020" class="LineNr">1020 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L29'>next</a>
-<span id="L1021" class="LineNr">1021 </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="L1022" class="LineNr">1022 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
-<span id="L1023" class="LineNr">1023 </span>  <span class="Delimiter">}</span>
-<span id="L1024" class="LineNr">1024 </span>  <span class="muControl">return</span> curr
-<span id="L1025" class="LineNr">1025 </span>]
-<span id="L1026" class="LineNr">1026 </span>
-<span id="L1027" class="LineNr">1027 </span><span class="muScenario">scenario</span> scrolling-down-past-bottom-on-recipe-side [
-<span id="L1028" class="LineNr">1028 </span>  <span class="Constant">local-scope</span>
-<span id="L1029" class="LineNr">1029 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L1030" class="LineNr">1030 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-<span id="L1031" class="LineNr">1031 </span>  <span class="Comment"># initialize sandbox side and create a sandbox</span>
-<span id="L1032" class="LineNr">1032 </span>  assume-resources [
-<span id="L1033" class="LineNr">1033 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
-<span id="L1034" class="LineNr">1034 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">||</span>  <span class="Comment"># file containing just a newline</span>
-<span id="L1035" class="LineNr">1035 </span>  <span class="Conceal">¦</span> ]
-<span id="L1036" class="LineNr">1036 </span>  ]
-<span id="L1037" class="LineNr">1037 </span>  <span class="Comment"># create a sandbox</span>
-<span id="L1038" class="LineNr">1038 </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="L1039" class="LineNr">1039 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L1040" class="LineNr">1040 </span>  assume-console [
-<span id="L1041" class="LineNr">1041 </span>  <span class="Conceal">¦</span> press F4
-<span id="L1042" class="LineNr">1042 </span>  ]
-<span id="L1043" class="LineNr">1043 </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="L1044" class="LineNr">1044 </span>  <span class="Comment"># hit 'down' in recipe editor</span>
-<span id="L1045" class="LineNr">1045 </span>  assume-console [
-<span id="L1046" class="LineNr">1046 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1047" class="LineNr">1047 </span>  ]
-<span id="L1048" class="LineNr">1048 </span>  run [
-<span id="L1049" class="LineNr">1049 </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="L1050" class="LineNr">1050 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1051" class="LineNr">1051 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L1052" class="LineNr">1052 </span>  ]
-<span id="L1053" class="LineNr">1053 </span>  <span class="Comment"># cursor doesn't move when the end is already on-screen</span>
-<span id="L1054" class="LineNr">1054 </span>  screen-should-contain [
-<span id="L1055" class="LineNr">1055 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1056" class="LineNr">1056 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣                                                 ╎                                                 .</span>
-<span id="L1057" class="LineNr">1057 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1058" class="LineNr">1058 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1059" class="LineNr">1059 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1060" class="LineNr">1060 </span>  ]
-<span id="L1061" class="LineNr">1061 </span>]
-<span id="L1062" class="LineNr">1062 </span>
-<span id="L1063" class="LineNr">1063 </span><span class="muScenario">scenario</span> scrolling-through-multiple-sandboxes [
-<span id="L1064" class="LineNr">1064 </span>  <span class="Constant">local-scope</span>
-<span id="L1065" class="LineNr">1065 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L1066" class="LineNr">1066 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-<span id="L1067" class="LineNr">1067 </span>  <span class="Comment"># initialize environment</span>
-<span id="L1068" class="LineNr">1068 </span>  assume-resources [
-<span id="L1069" class="LineNr">1069 </span>  ]
-<span id="L1070" class="LineNr">1070 </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="L1071" class="LineNr">1071 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L1072" class="LineNr">1072 </span>  <span class="Comment"># create 2 sandboxes</span>
-<span id="L1073" class="LineNr">1073 </span>  assume-console [
-<span id="L1074" class="LineNr">1074 </span>  <span class="Conceal">¦</span> press ctrl-n
-<span id="L1075" class="LineNr">1075 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
-<span id="L1076" class="LineNr">1076 </span>  <span class="Conceal">¦</span> press F4
-<span id="L1077" class="LineNr">1077 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L975" class="LineNr"> 975 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L976" class="LineNr"> 976 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L977" class="LineNr"> 977 </span>  <span class="Delimiter">}</span>
+<span id="L978" class="LineNr"> 978 </span>]
+<span id="L979" class="LineNr"> 979 </span>
+<span id="L980" class="LineNr"> 980 </span><span class="Comment"># update-cursor takes render-from into account</span>
+<span id="L981" class="LineNr"> 981 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L449'>&lt;update-cursor-special-cases&gt;</a></span> [
+<span id="L982" class="LineNr"> 982 </span>  <span class="Delimiter">{</span>
+<span id="L983" class="LineNr"> 983 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L984" class="LineNr"> 984 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+<span id="L985" class="LineNr"> 985 </span>  <span class="Conceal">¦</span> scrolling?:bool <span class="Special">&lt;-</span> greater-or-equal render-from,<span class="Constant"> 0</span>
+<span id="L986" class="LineNr"> 986 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> scrolling?
+<span id="L987" class="LineNr"> 987 </span>  <span class="Conceal">¦</span> cursor-column:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
+<span id="L988" class="LineNr"> 988 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L435'>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="L989" class="LineNr"> 989 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
+<span id="L990" class="LineNr"> 990 </span>  <span class="Delimiter">}</span>
+<span id="L991" class="LineNr"> 991 </span>]
+<span id="L992" class="LineNr"> 992 </span>
+<span id="L993" class="LineNr"> 993 </span><span class="Comment"># 'page-up' on sandbox side is like 'page-down': updates render-from when necessary</span>
+<span id="L994" class="LineNr"> 994 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L57'>&lt;global-keypress&gt;</a></span> [
+<span id="L995" class="LineNr"> 995 </span>  <span class="Delimiter">{</span>
+<span id="L996" class="LineNr"> 996 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> sandbox-in-focus?
+<span id="L997" class="LineNr"> 997 </span>  <span class="Conceal">¦</span> page-up?:bool <span class="Special">&lt;-</span> equal k, <span class="Constant">65519/page-up</span>
+<span id="L998" class="LineNr"> 998 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> page-up?
+<span id="L999" class="LineNr"> 999 </span>  <span class="Conceal">¦</span> render-from:num <span class="Special">&lt;-</span> get *env, <span class="Constant">render-from:offset</span>
+<span id="L1000" class="LineNr">1000 </span>  <span class="Conceal">¦</span> at-beginning?:bool <span class="Special">&lt;-</span> equal render-from,<span class="Constant"> -1</span>
+<span id="L1001" class="LineNr">1001 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-beginning?
+<span id="L1002" class="LineNr">1002 </span>  <span class="Conceal">¦</span> render-from <span class="Special">&lt;-</span> subtract render-from,<span class="Constant"> 1</span>
+<span id="L1003" class="LineNr">1003 </span>  <span class="Conceal">¦</span> *env <span class="Special">&lt;-</span> put *env, <span class="Constant">render-from:offset</span>, render-from
+<span id="L1004" class="LineNr">1004 </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#L121'>render</a>
+<span id="L1005" class="LineNr">1005 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L1006" class="LineNr">1006 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
+<span id="L1007" class="LineNr">1007 </span>  <span class="Delimiter">}</span>
+<span id="L1008" class="LineNr">1008 </span>]
+<span id="L1009" class="LineNr">1009 </span>
+<span id="L1010" class="LineNr">1010 </span><span class="Comment"># sandbox belonging to 'env' whose next-sandbox is 'in'</span>
+<span id="L1011" class="LineNr">1011 </span><span class="Comment"># return 0 if there's no such sandbox, either because 'in' doesn't exist in 'env', or because it's the first sandbox</span>
+<span id="L1012" class="LineNr">1012 </span><span class="muRecipe">def</span> <a href='005-sandbox.mu.html#L1012'>previous-sandbox</a> env:&amp;:environment, in:&amp;:sandbox<span class="muRecipe"> -&gt; </span>out:&amp;:sandbox [
+<span id="L1013" class="LineNr">1013 </span>  <span class="Constant">local-scope</span>
+<span id="L1014" class="LineNr">1014 </span>  <span class="Constant">load-ingredients</span>
+<span id="L1015" class="LineNr">1015 </span>  curr:&amp;:sandbox <span class="Special">&lt;-</span> get *env, <span class="Constant">sandbox:offset</span>
+<span id="L1016" class="LineNr">1016 </span>  <span class="muControl">return-unless</span> curr, <span class="Constant">0/nil</span>
+<span id="L1017" class="LineNr">1017 </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="L1018" class="LineNr">1018 </span>  <span class="Delimiter">{</span>
+<span id="L1019" class="LineNr">1019 </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="L1020" class="LineNr">1020 </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="L1021" class="LineNr">1021 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> found?
+<span id="L1022" class="LineNr">1022 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L29'>next</a>
+<span id="L1023" class="LineNr">1023 </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="L1024" class="LineNr">1024 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
+<span id="L1025" class="LineNr">1025 </span>  <span class="Delimiter">}</span>
+<span id="L1026" class="LineNr">1026 </span>  <span class="muControl">return</span> curr
+<span id="L1027" class="LineNr">1027 </span>]
+<span id="L1028" class="LineNr">1028 </span>
+<span id="L1029" class="LineNr">1029 </span><span class="muScenario">scenario</span> scrolling-down-past-bottom-on-recipe-side [
+<span id="L1030" class="LineNr">1030 </span>  <span class="Constant">local-scope</span>
+<span id="L1031" class="LineNr">1031 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L1032" class="LineNr">1032 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
+<span id="L1033" class="LineNr">1033 </span>  <span class="Comment"># initialize sandbox side and create a sandbox</span>
+<span id="L1034" class="LineNr">1034 </span>  assume-resources [
+<span id="L1035" class="LineNr">1035 </span>  <span class="Conceal">¦</span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special">&lt;-</span> [
+<span id="L1036" class="LineNr">1036 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Constant">||</span>  <span class="Comment"># file containing just a newline</span>
+<span id="L1037" class="LineNr">1037 </span>  <span class="Conceal">¦</span> ]
+<span id="L1038" class="LineNr">1038 </span>  ]
+<span id="L1039" class="LineNr">1039 </span>  <span class="Comment"># create a sandbox</span>
+<span id="L1040" class="LineNr">1040 </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="L1041" class="LineNr">1041 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L1042" class="LineNr">1042 </span>  assume-console [
+<span id="L1043" class="LineNr">1043 </span>  <span class="Conceal">¦</span> press F4
+<span id="L1044" class="LineNr">1044 </span>  ]
+<span id="L1045" class="LineNr">1045 </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="L1046" class="LineNr">1046 </span>  <span class="Comment"># hit 'down' in recipe editor</span>
+<span id="L1047" class="LineNr">1047 </span>  assume-console [
+<span id="L1048" class="LineNr">1048 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1049" class="LineNr">1049 </span>  ]
+<span id="L1050" class="LineNr">1050 </span>  run [
+<span id="L1051" class="LineNr">1051 </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="L1052" class="LineNr">1052 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1053" class="LineNr">1053 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1054" class="LineNr">1054 </span>  ]
+<span id="L1055" class="LineNr">1055 </span>  <span class="Comment"># cursor doesn't move when the end is already on-screen</span>
+<span id="L1056" class="LineNr">1056 </span>  screen-should-contain [
+<span id="L1057" class="LineNr">1057 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1058" class="LineNr">1058 </span>  <span class="Conceal">¦</span><span class="Constant"> .␣                                                 ╎                                                 .</span>
+<span id="L1059" class="LineNr">1059 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1060" class="LineNr">1060 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1061" class="LineNr">1061 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1062" class="LineNr">1062 </span>  ]
+<span id="L1063" class="LineNr">1063 </span>]
+<span id="L1064" class="LineNr">1064 </span>
+<span id="L1065" class="LineNr">1065 </span><span class="muScenario">scenario</span> scrolling-through-multiple-sandboxes [
+<span id="L1066" class="LineNr">1066 </span>  <span class="Constant">local-scope</span>
+<span id="L1067" class="LineNr">1067 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L1068" class="LineNr">1068 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
+<span id="L1069" class="LineNr">1069 </span>  <span class="Comment"># initialize environment</span>
+<span id="L1070" class="LineNr">1070 </span>  assume-resources [
+<span id="L1071" class="LineNr">1071 </span>  ]
+<span id="L1072" class="LineNr">1072 </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="L1073" class="LineNr">1073 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L1074" class="LineNr">1074 </span>  <span class="Comment"># create 2 sandboxes</span>
+<span id="L1075" class="LineNr">1075 </span>  assume-console [
+<span id="L1076" class="LineNr">1076 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L1077" class="LineNr">1077 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 2, 2]</span>
 <span id="L1078" class="LineNr">1078 </span>  <span class="Conceal">¦</span> press F4
-<span id="L1079" class="LineNr">1079 </span>  ]
-<span id="L1080" class="LineNr">1080 </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="L1081" class="LineNr">1081 </span>  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1082" class="LineNr">1082 </span>  print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L1083" class="LineNr">1083 </span>  screen-should-contain [
-<span id="L1084" class="LineNr">1084 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1085" class="LineNr">1085 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L1086" class="LineNr">1086 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1087" class="LineNr">1087 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1088" class="LineNr">1088 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1089" class="LineNr">1089 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1090" class="LineNr">1090 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1091" class="LineNr">1091 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1092" class="LineNr">1092 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1093" class="LineNr">1093 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1094" class="LineNr">1094 </span>  ]
-<span id="L1095" class="LineNr">1095 </span>  <span class="Comment"># hit 'page-down'</span>
-<span id="L1096" class="LineNr">1096 </span>  assume-console [
-<span id="L1097" class="LineNr">1097 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1098" class="LineNr">1098 </span>  ]
-<span id="L1099" class="LineNr">1099 </span>  run [
-<span id="L1100" class="LineNr">1100 </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="L1101" class="LineNr">1101 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1102" class="LineNr">1102 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L1103" class="LineNr">1103 </span>  ]
-<span id="L1104" class="LineNr">1104 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
-<span id="L1105" class="LineNr">1105 </span>  <span class="Comment"># cursor moves to first sandbox</span>
-<span id="L1106" class="LineNr">1106 </span>  screen-should-contain [
-<span id="L1107" class="LineNr">1107 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1108" class="LineNr">1108 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1109" class="LineNr">1109 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .</span>
-<span id="L1110" class="LineNr">1110 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1111" class="LineNr">1111 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1112" class="LineNr">1112 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1113" class="LineNr">1113 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1114" class="LineNr">1114 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1115" class="LineNr">1115 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1116" class="LineNr">1116 </span>  ]
-<span id="L1117" class="LineNr">1117 </span>  <span class="Comment"># hit 'page-down' again</span>
-<span id="L1118" class="LineNr">1118 </span>  assume-console [
-<span id="L1119" class="LineNr">1119 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1120" class="LineNr">1120 </span>  ]
-<span id="L1121" class="LineNr">1121 </span>  run [
-<span id="L1122" class="LineNr">1122 </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="L1123" class="LineNr">1123 </span>  ]
-<span id="L1124" class="LineNr">1124 </span>  <span class="Comment"># just second sandbox displayed</span>
-<span id="L1125" class="LineNr">1125 </span>  screen-should-contain [
-<span id="L1126" class="LineNr">1126 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1127" class="LineNr">1127 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1128" class="LineNr">1128 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L1129" class="LineNr">1129 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1130" class="LineNr">1130 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1131" class="LineNr">1131 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1132" class="LineNr">1132 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1133" class="LineNr">1133 </span>  ]
-<span id="L1134" class="LineNr">1134 </span>  <span class="Comment"># hit 'page-down' again</span>
-<span id="L1135" class="LineNr">1135 </span>  assume-console [
-<span id="L1136" class="LineNr">1136 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1137" class="LineNr">1137 </span>  ]
-<span id="L1138" class="LineNr">1138 </span>  run [
-<span id="L1139" class="LineNr">1139 </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="L1140" class="LineNr">1140 </span>  ]
-<span id="L1141" class="LineNr">1141 </span>  <span class="Comment"># no change</span>
-<span id="L1142" class="LineNr">1142 </span>  screen-should-contain [
-<span id="L1143" class="LineNr">1143 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1144" class="LineNr">1144 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1145" class="LineNr">1145 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
-<span id="L1146" class="LineNr">1146 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1147" class="LineNr">1147 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1148" class="LineNr">1148 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1149" class="LineNr">1149 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1150" class="LineNr">1150 </span>  ]
-<span id="L1151" class="LineNr">1151 </span>  <span class="Comment"># hit 'page-up'</span>
-<span id="L1152" class="LineNr">1152 </span>  assume-console [
-<span id="L1153" class="LineNr">1153 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
-<span id="L1154" class="LineNr">1154 </span>  ]
-<span id="L1155" class="LineNr">1155 </span>  run [
-<span id="L1156" class="LineNr">1156 </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="L1157" class="LineNr">1157 </span>  ]
-<span id="L1158" class="LineNr">1158 </span>  <span class="Comment"># back to displaying both sandboxes without editor</span>
-<span id="L1159" class="LineNr">1159 </span>  screen-should-contain [
-<span id="L1160" class="LineNr">1160 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1161" class="LineNr">1161 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1162" class="LineNr">1162 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1163" class="LineNr">1163 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1164" class="LineNr">1164 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1165" class="LineNr">1165 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1166" class="LineNr">1166 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1167" class="LineNr">1167 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1168" class="LineNr">1168 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1169" class="LineNr">1169 </span>  ]
-<span id="L1170" class="LineNr">1170 </span>  <span class="Comment"># hit 'page-up' again</span>
-<span id="L1171" class="LineNr">1171 </span>  assume-console [
-<span id="L1172" class="LineNr">1172 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
-<span id="L1173" class="LineNr">1173 </span>  ]
-<span id="L1174" class="LineNr">1174 </span>  run [
-<span id="L1175" class="LineNr">1175 </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="L1176" class="LineNr">1176 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1177" class="LineNr">1177 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L1178" class="LineNr">1178 </span>  ]
-<span id="L1179" class="LineNr">1179 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
-<span id="L1180" class="LineNr">1180 </span>  screen-should-contain [
-<span id="L1181" class="LineNr">1181 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1182" class="LineNr">1182 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L1183" class="LineNr">1183 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1184" class="LineNr">1184 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1185" class="LineNr">1185 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1186" class="LineNr">1186 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</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="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1189" class="LineNr">1189 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1190" class="LineNr">1190 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1191" class="LineNr">1191 </span>  ]
-<span id="L1192" class="LineNr">1192 </span>  <span class="Comment"># hit 'page-up' again</span>
-<span id="L1193" class="LineNr">1193 </span>  assume-console [
-<span id="L1194" class="LineNr">1194 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
-<span id="L1195" class="LineNr">1195 </span>  ]
-<span id="L1196" class="LineNr">1196 </span>  run [
-<span id="L1197" class="LineNr">1197 </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="L1198" class="LineNr">1198 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
-<span id="L1199" class="LineNr">1199 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
-<span id="L1200" class="LineNr">1200 </span>  ]
-<span id="L1201" class="LineNr">1201 </span>  <span class="Comment"># no change</span>
-<span id="L1202" class="LineNr">1202 </span>  screen-should-contain [
-<span id="L1203" class="LineNr">1203 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1204" class="LineNr">1204 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
-<span id="L1205" class="LineNr">1205 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1206" class="LineNr">1206 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1207" class="LineNr">1207 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1208" class="LineNr">1208 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1209" class="LineNr">1209 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1210" class="LineNr">1210 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
-<span id="L1211" class="LineNr">1211 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
-<span id="L1212" class="LineNr">1212 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
-<span id="L1213" class="LineNr">1213 </span>  ]
-<span id="L1214" class="LineNr">1214 </span>]
-<span id="L1215" class="LineNr">1215 </span>
-<span id="L1216" class="LineNr">1216 </span><span class="muScenario">scenario</span> scrolling-manages-sandbox-index-correctly [
-<span id="L1217" class="LineNr">1217 </span>  <span class="Constant">local-scope</span>
-<span id="L1218" class="LineNr">1218 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
-<span id="L1219" class="LineNr">1219 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
-<span id="L1220" class="LineNr">1220 </span>  <span class="Comment"># initialize environment</span>
-<span id="L1221" class="LineNr">1221 </span>  assume-resources [
-<span id="L1222" class="LineNr">1222 </span>  ]
-<span id="L1223" class="LineNr">1223 </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="L1224" class="LineNr">1224 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
-<span id="L1225" class="LineNr">1225 </span>  <span class="Comment"># create a sandbox</span>
-<span id="L1226" class="LineNr">1226 </span>  assume-console [
-<span id="L1227" class="LineNr">1227 </span>  <span class="Conceal">¦</span> press ctrl-n
-<span id="L1228" class="LineNr">1228 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
-<span id="L1229" class="LineNr">1229 </span>  <span class="Conceal">¦</span> press F4
-<span id="L1230" class="LineNr">1230 </span>  ]
-<span id="L1231" class="LineNr">1231 </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="L1232" class="LineNr">1232 </span>  screen-should-contain [
-<span id="L1233" class="LineNr">1233 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1234" class="LineNr">1234 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1235" class="LineNr">1235 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1236" class="LineNr">1236 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1237" class="LineNr">1237 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1238" class="LineNr">1238 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1239" class="LineNr">1239 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1240" class="LineNr">1240 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1241" class="LineNr">1241 </span>  ]
-<span id="L1242" class="LineNr">1242 </span>  <span class="Comment"># hit 'page-down' and 'page-up' a couple of times. sandbox index should be stable</span>
-<span id="L1243" class="LineNr">1243 </span>  assume-console [
-<span id="L1244" class="LineNr">1244 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1245" class="LineNr">1245 </span>  ]
-<span id="L1246" class="LineNr">1246 </span>  run [
-<span id="L1247" class="LineNr">1247 </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="L1248" class="LineNr">1248 </span>  ]
-<span id="L1249" class="LineNr">1249 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
-<span id="L1250" class="LineNr">1250 </span>  <span class="Comment"># cursor moves to first sandbox</span>
-<span id="L1251" class="LineNr">1251 </span>  screen-should-contain [
-<span id="L1252" class="LineNr">1252 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1253" class="LineNr">1253 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1254" class="LineNr">1254 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1255" class="LineNr">1255 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1256" class="LineNr">1256 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1257" class="LineNr">1257 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1258" class="LineNr">1258 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1259" class="LineNr">1259 </span>  ]
-<span id="L1260" class="LineNr">1260 </span>  <span class="Comment"># hit 'page-up' again</span>
-<span id="L1261" class="LineNr">1261 </span>  assume-console [
-<span id="L1262" class="LineNr">1262 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
-<span id="L1263" class="LineNr">1263 </span>  ]
-<span id="L1264" class="LineNr">1264 </span>  run [
-<span id="L1265" class="LineNr">1265 </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="L1266" class="LineNr">1266 </span>  ]
-<span id="L1267" class="LineNr">1267 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
-<span id="L1268" class="LineNr">1268 </span>  screen-should-contain [
-<span id="L1269" class="LineNr">1269 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1270" class="LineNr">1270 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1271" class="LineNr">1271 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
-<span id="L1272" class="LineNr">1272 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
-<span id="L1273" class="LineNr">1273 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1274" class="LineNr">1274 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1275" class="LineNr">1275 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1276" class="LineNr">1276 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1277" class="LineNr">1277 </span>  ]
-<span id="L1278" class="LineNr">1278 </span>  <span class="Comment"># hit 'page-down'</span>
-<span id="L1279" class="LineNr">1279 </span>  assume-console [
-<span id="L1280" class="LineNr">1280 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
-<span id="L1281" class="LineNr">1281 </span>  ]
-<span id="L1282" class="LineNr">1282 </span>  run [
-<span id="L1283" class="LineNr">1283 </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="L1284" class="LineNr">1284 </span>  ]
-<span id="L1285" class="LineNr">1285 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
-<span id="L1286" class="LineNr">1286 </span>  <span class="Comment"># cursor moves to first sandbox</span>
-<span id="L1287" class="LineNr">1287 </span>  screen-should-contain [
-<span id="L1288" class="LineNr">1288 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
-<span id="L1289" class="LineNr">1289 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1290" class="LineNr">1290 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
-<span id="L1291" class="LineNr">1291 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
-<span id="L1292" class="LineNr">1292 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
-<span id="L1293" class="LineNr">1293 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
-<span id="L1294" class="LineNr">1294 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
-<span id="L1295" class="LineNr">1295 </span>  ]
-<span id="L1296" class="LineNr">1296 </span>]
+<span id="L1079" class="LineNr">1079 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L1080" class="LineNr">1080 </span>  <span class="Conceal">¦</span> press F4
+<span id="L1081" class="LineNr">1081 </span>  ]
+<span id="L1082" class="LineNr">1082 </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="L1083" class="LineNr">1083 </span>  cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1084" class="LineNr">1084 </span>  print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1085" class="LineNr">1085 </span>  screen-should-contain [
+<span id="L1086" class="LineNr">1086 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1087" class="LineNr">1087 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
+<span id="L1088" class="LineNr">1088 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1089" class="LineNr">1089 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1090" class="LineNr">1090 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1091" class="LineNr">1091 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1092" class="LineNr">1092 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1093" class="LineNr">1093 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1094" class="LineNr">1094 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1095" class="LineNr">1095 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1096" class="LineNr">1096 </span>  ]
+<span id="L1097" class="LineNr">1097 </span>  <span class="Comment"># hit 'page-down'</span>
+<span id="L1098" class="LineNr">1098 </span>  assume-console [
+<span id="L1099" class="LineNr">1099 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1100" class="LineNr">1100 </span>  ]
+<span id="L1101" class="LineNr">1101 </span>  run [
+<span id="L1102" class="LineNr">1102 </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="L1103" class="LineNr">1103 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1104" class="LineNr">1104 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1105" class="LineNr">1105 </span>  ]
+<span id="L1106" class="LineNr">1106 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
+<span id="L1107" class="LineNr">1107 </span>  <span class="Comment"># cursor moves to first sandbox</span>
+<span id="L1108" class="LineNr">1108 </span>  screen-should-contain [
+<span id="L1109" class="LineNr">1109 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1110" class="LineNr">1110 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1111" class="LineNr">1111 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎␣   edit          copy            delete         .</span>
+<span id="L1112" class="LineNr">1112 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1113" class="LineNr">1113 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1114" class="LineNr">1114 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1115" class="LineNr">1115 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1116" class="LineNr">1116 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1117" class="LineNr">1117 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1118" class="LineNr">1118 </span>  ]
+<span id="L1119" class="LineNr">1119 </span>  <span class="Comment"># hit 'page-down' again</span>
+<span id="L1120" class="LineNr">1120 </span>  assume-console [
+<span id="L1121" class="LineNr">1121 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1122" class="LineNr">1122 </span>  ]
+<span id="L1123" class="LineNr">1123 </span>  run [
+<span id="L1124" class="LineNr">1124 </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="L1125" class="LineNr">1125 </span>  ]
+<span id="L1126" class="LineNr">1126 </span>  <span class="Comment"># just second sandbox displayed</span>
+<span id="L1127" class="LineNr">1127 </span>  screen-should-contain [
+<span id="L1128" class="LineNr">1128 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1129" class="LineNr">1129 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1130" class="LineNr">1130 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L1131" class="LineNr">1131 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1132" class="LineNr">1132 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1133" class="LineNr">1133 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1134" class="LineNr">1134 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1135" class="LineNr">1135 </span>  ]
+<span id="L1136" class="LineNr">1136 </span>  <span class="Comment"># hit 'page-down' again</span>
+<span id="L1137" class="LineNr">1137 </span>  assume-console [
+<span id="L1138" class="LineNr">1138 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1139" class="LineNr">1139 </span>  ]
+<span id="L1140" class="LineNr">1140 </span>  run [
+<span id="L1141" class="LineNr">1141 </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="L1142" class="LineNr">1142 </span>  ]
+<span id="L1143" class="LineNr">1143 </span>  <span class="Comment"># no change</span>
+<span id="L1144" class="LineNr">1144 </span>  screen-should-contain [
+<span id="L1145" class="LineNr">1145 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</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"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎1   edit          copy            delete         .</span>
+<span id="L1148" class="LineNr">1148 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1149" class="LineNr">1149 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1150" class="LineNr">1150 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1151" class="LineNr">1151 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1152" class="LineNr">1152 </span>  ]
+<span id="L1153" class="LineNr">1153 </span>  <span class="Comment"># hit 'page-up'</span>
+<span id="L1154" class="LineNr">1154 </span>  assume-console [
+<span id="L1155" class="LineNr">1155 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1156" class="LineNr">1156 </span>  ]
+<span id="L1157" class="LineNr">1157 </span>  run [
+<span id="L1158" class="LineNr">1158 </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="L1159" class="LineNr">1159 </span>  ]
+<span id="L1160" class="LineNr">1160 </span>  <span class="Comment"># back to displaying both sandboxes without editor</span>
+<span id="L1161" class="LineNr">1161 </span>  screen-should-contain [
+<span id="L1162" class="LineNr">1162 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1163" class="LineNr">1163 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1164" class="LineNr">1164 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1165" class="LineNr">1165 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1166" class="LineNr">1166 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1167" class="LineNr">1167 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1168" class="LineNr">1168 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1169" class="LineNr">1169 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1170" class="LineNr">1170 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1171" class="LineNr">1171 </span>  ]
+<span id="L1172" class="LineNr">1172 </span>  <span class="Comment"># hit 'page-up' again</span>
+<span id="L1173" class="LineNr">1173 </span>  assume-console [
+<span id="L1174" class="LineNr">1174 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1175" class="LineNr">1175 </span>  ]
+<span id="L1176" class="LineNr">1176 </span>  run [
+<span id="L1177" class="LineNr">1177 </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="L1178" class="LineNr">1178 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1179" class="LineNr">1179 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1180" class="LineNr">1180 </span>  ]
+<span id="L1181" class="LineNr">1181 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
+<span id="L1182" class="LineNr">1182 </span>  screen-should-contain [
+<span id="L1183" class="LineNr">1183 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1184" class="LineNr">1184 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎␣                                                .</span>
+<span id="L1185" class="LineNr">1185 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1186" class="LineNr">1186 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1187" class="LineNr">1187 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1188" class="LineNr">1188 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1189" class="LineNr">1189 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1190" class="LineNr">1190 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1191" class="LineNr">1191 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1192" class="LineNr">1192 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1193" class="LineNr">1193 </span>  ]
+<span id="L1194" class="LineNr">1194 </span>  <span class="Comment"># hit 'page-up' again</span>
+<span id="L1195" class="LineNr">1195 </span>  assume-console [
+<span id="L1196" class="LineNr">1196 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1197" class="LineNr">1197 </span>  ]
+<span id="L1198" class="LineNr">1198 </span>  run [
+<span id="L1199" class="LineNr">1199 </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="L1200" class="LineNr">1200 </span>  <span class="Conceal">¦</span> cursor:char <span class="Special">&lt;-</span> copy <span class="Constant">9251/␣</span>
+<span id="L1201" class="LineNr">1201 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, cursor
+<span id="L1202" class="LineNr">1202 </span>  ]
+<span id="L1203" class="LineNr">1203 </span>  <span class="Comment"># no change</span>
+<span id="L1204" class="LineNr">1204 </span>  screen-should-contain [
+<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="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1208" class="LineNr">1208 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1209" class="LineNr">1209 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1210" class="LineNr">1210 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1211" class="LineNr">1211 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1212" class="LineNr">1212 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎1   edit          copy            delete         .</span>
+<span id="L1213" class="LineNr">1213 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 2, 2                                         .</span>
+<span id="L1214" class="LineNr">1214 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎4                                                .</span>
+<span id="L1215" class="LineNr">1215 </span>  ]
+<span id="L1216" class="LineNr">1216 </span>]
+<span id="L1217" class="LineNr">1217 </span>
+<span id="L1218" class="LineNr">1218 </span><span class="muScenario">scenario</span> scrolling-manages-sandbox-index-correctly [
+<span id="L1219" class="LineNr">1219 </span>  <span class="Constant">local-scope</span>
+<span id="L1220" class="LineNr">1220 </span>  trace-until <span class="Constant">100/app</span>  <span class="Comment"># trace too long</span>
+<span id="L1221" class="LineNr">1221 </span>  assume-screen <span class="Constant">100/width</span>, <span class="Constant">10/height</span>
+<span id="L1222" class="LineNr">1222 </span>  <span class="Comment"># initialize environment</span>
+<span id="L1223" class="LineNr">1223 </span>  assume-resources [
+<span id="L1224" class="LineNr">1224 </span>  ]
+<span id="L1225" class="LineNr">1225 </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="L1226" class="LineNr">1226 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L1227" class="LineNr">1227 </span>  <span class="Comment"># create a sandbox</span>
+<span id="L1228" class="LineNr">1228 </span>  assume-console [
+<span id="L1229" class="LineNr">1229 </span>  <span class="Conceal">¦</span> press ctrl-n
+<span id="L1230" class="LineNr">1230 </span>  <span class="Conceal">¦</span> type <span class="Constant">[add 1, 1]</span>
+<span id="L1231" class="LineNr">1231 </span>  <span class="Conceal">¦</span> press F4
+<span id="L1232" class="LineNr">1232 </span>  ]
+<span id="L1233" class="LineNr">1233 </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="L1234" class="LineNr">1234 </span>  screen-should-contain [
+<span id="L1235" class="LineNr">1235 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</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="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1238" class="LineNr">1238 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1239" class="LineNr">1239 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1240" class="LineNr">1240 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1241" class="LineNr">1241 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1242" class="LineNr">1242 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1243" class="LineNr">1243 </span>  ]
+<span id="L1244" class="LineNr">1244 </span>  <span class="Comment"># hit 'page-down' and 'page-up' a couple of times. sandbox index should be stable</span>
+<span id="L1245" class="LineNr">1245 </span>  assume-console [
+<span id="L1246" class="LineNr">1246 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1247" class="LineNr">1247 </span>  ]
+<span id="L1248" class="LineNr">1248 </span>  run [
+<span id="L1249" class="LineNr">1249 </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="L1250" class="LineNr">1250 </span>  ]
+<span id="L1251" class="LineNr">1251 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
+<span id="L1252" class="LineNr">1252 </span>  <span class="Comment"># cursor moves to first sandbox</span>
+<span id="L1253" class="LineNr">1253 </span>  screen-should-contain [
+<span id="L1254" class="LineNr">1254 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1255" class="LineNr">1255 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1256" class="LineNr">1256 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1257" class="LineNr">1257 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1258" class="LineNr">1258 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1259" class="LineNr">1259 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1260" class="LineNr">1260 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1261" class="LineNr">1261 </span>  ]
+<span id="L1262" class="LineNr">1262 </span>  <span class="Comment"># hit 'page-up' again</span>
+<span id="L1263" class="LineNr">1263 </span>  assume-console [
+<span id="L1264" class="LineNr">1264 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2987'>page-up</a>
+<span id="L1265" class="LineNr">1265 </span>  ]
+<span id="L1266" class="LineNr">1266 </span>  run [
+<span id="L1267" class="LineNr">1267 </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="L1268" class="LineNr">1268 </span>  ]
+<span id="L1269" class="LineNr">1269 </span>  <span class="Comment"># back to displaying both sandboxes as well as editor</span>
+<span id="L1270" class="LineNr">1270 </span>  screen-should-contain [
+<span id="L1271" class="LineNr">1271 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1272" class="LineNr">1272 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1273" class="LineNr">1273 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎─────────────────────────────────────────────────.</span>
+<span id="L1274" class="LineNr">1274 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎0   edit          copy            delete         .</span>
+<span id="L1275" class="LineNr">1275 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1276" class="LineNr">1276 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1277" class="LineNr">1277 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1278" class="LineNr">1278 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1279" class="LineNr">1279 </span>  ]
+<span id="L1280" class="LineNr">1280 </span>  <span class="Comment"># hit 'page-down'</span>
+<span id="L1281" class="LineNr">1281 </span>  assume-console [
+<span id="L1282" class="LineNr">1282 </span>  <span class="Conceal">¦</span> press <a href='003-shortcuts.mu.html#L2789'>page-down</a>
+<span id="L1283" class="LineNr">1283 </span>  ]
+<span id="L1284" class="LineNr">1284 </span>  run [
+<span id="L1285" class="LineNr">1285 </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="L1286" class="LineNr">1286 </span>  ]
+<span id="L1287" class="LineNr">1287 </span>  <span class="Comment"># sandbox editor hidden; first sandbox displayed</span>
+<span id="L1288" class="LineNr">1288 </span>  <span class="Comment"># cursor moves to first sandbox</span>
+<span id="L1289" class="LineNr">1289 </span>  screen-should-contain [
+<span id="L1290" class="LineNr">1290 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                                                 run (F4)           .</span>
+<span id="L1291" class="LineNr">1291 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1292" class="LineNr">1292 </span>  <span class="Conceal">¦</span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎0   edit          copy            delete         .</span>
+<span id="L1293" class="LineNr">1293 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎add 1, 1                                         .</span>
+<span id="L1294" class="LineNr">1294 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎2                                                .</span>
+<span id="L1295" class="LineNr">1295 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎─────────────────────────────────────────────────.</span>
+<span id="L1296" class="LineNr">1296 </span>  <span class="Conceal">¦</span><span class="Constant"> .                                                  ╎                                                 .</span>
+<span id="L1297" class="LineNr">1297 </span>  ]
+<span id="L1298" class="LineNr">1298 </span>]
 </pre>
 </body>
 </html>
diff --git a/html/edit/006-sandbox-copy.mu.html b/html/edit/006-sandbox-copy.mu.html
index 61a06072..d7d3192a 100644
--- a/html/edit/006-sandbox-copy.mu.html
+++ b/html/edit/006-sandbox-copy.mu.html
@@ -183,7 +183,7 @@ if ('onhashchange' in window) {
 <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="L124" class="LineNr">124 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L76'>&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>  <span class="Conceal">¦</span> copy?:bool <span class="Special">&lt;-</span> <a href='006-sandbox-copy.mu.html#L138'>should-attempt-copy?</a> click-row, click-column, env
@@ -191,7 +191,7 @@ if ('onhashchange' in window) {
 <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#L157'>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#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#L121'>render</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> <a href='004-programming-environment.mu.html#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L132" class="LineNr">132 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
 <span id="L133" class="LineNr">133 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L134" class="LineNr">134 </span>  <span class="Delimiter">}</span>
 <span id="L135" class="LineNr">135 </span>]
diff --git a/html/edit/007-sandbox-delete.mu.html b/html/edit/007-sandbox-delete.mu.html
index fbfa79c6..327563c0 100644
--- a/html/edit/007-sandbox-delete.mu.html
+++ b/html/edit/007-sandbox-delete.mu.html
@@ -127,7 +127,7 @@ if ('onhashchange' in window) {
 <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="L68" class="LineNr"> 68 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L76'>&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>  <span class="Conceal">¦</span> delete?:bool <span class="Special">&lt;-</span> <a href='007-sandbox-delete.mu.html#L82'>should-attempt-delete?</a> click-row, click-column, env
@@ -135,7 +135,7 @@ if ('onhashchange' in window) {
 <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#L97'>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#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#L121'>render</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> <a href='004-programming-environment.mu.html#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L76" class="LineNr"> 76 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
 <span id="L77" class="LineNr"> 77 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L78" class="LineNr"> 78 </span>  <span class="Delimiter">}</span>
 <span id="L79" class="LineNr"> 79 </span>]
@@ -216,7 +216,7 @@ if ('onhashchange' in window) {
 <span id="L154" class="LineNr">154 </span>  assume-resources [
 <span id="L155" class="LineNr">155 </span>  ]
 <span id="L156" class="LineNr">156 </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="L157" class="LineNr">157 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L157" class="LineNr">157 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L158" class="LineNr">158 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L159" class="LineNr">159 </span>  assume-console [
 <span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> press ctrl-n
@@ -263,7 +263,7 @@ if ('onhashchange' in window) {
 <span id="L201" class="LineNr">201 </span>  assume-resources [
 <span id="L202" class="LineNr">202 </span>  ]
 <span id="L203" class="LineNr">203 </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="L204" class="LineNr">204 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L204" class="LineNr">204 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L205" class="LineNr">205 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L206" class="LineNr">206 </span>  assume-console [
 <span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> press ctrl-n
@@ -310,7 +310,7 @@ if ('onhashchange' in window) {
 <span id="L248" class="LineNr">248 </span>  assume-resources [
 <span id="L249" class="LineNr">249 </span>  ]
 <span id="L250" class="LineNr">250 </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="L251" class="LineNr">251 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L251" class="LineNr">251 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L252" class="LineNr">252 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L253" class="LineNr">253 </span>  assume-console [
 <span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> press ctrl-n
@@ -359,7 +359,7 @@ if ('onhashchange' in window) {
 <span id="L297" class="LineNr">297 </span>  assume-resources [
 <span id="L298" class="LineNr">298 </span>  ]
 <span id="L299" class="LineNr">299 </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="L300" class="LineNr">300 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L300" class="LineNr">300 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L301" class="LineNr">301 </span>  <span class="Comment"># create 2 sandboxes</span>
 <span id="L302" class="LineNr">302 </span>  assume-console [
 <span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span> press ctrl-n
diff --git a/html/edit/008-sandbox-edit.mu.html b/html/edit/008-sandbox-edit.mu.html
index 56a9c009..f1ea0ffb 100644
--- a/html/edit/008-sandbox-edit.mu.html
+++ b/html/edit/008-sandbox-edit.mu.html
@@ -166,7 +166,7 @@ if ('onhashchange' in window) {
 <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> [
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 <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>  <span class="Conceal">¦</span> edit?:bool <span class="Special">&lt;-</span> <a href='008-sandbox-edit.mu.html#L121'>should-attempt-edit?</a> click-row, click-column, env
@@ -174,7 +174,7 @@ if ('onhashchange' in window) {
 <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#L140'>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#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#L121'>render</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> <a href='004-programming-environment.mu.html#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L115" class="LineNr">115 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
 <span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L117" class="LineNr">117 </span>  <span class="Delimiter">}</span>
 <span id="L118" class="LineNr">118 </span>]
@@ -270,7 +270,7 @@ if ('onhashchange' in window) {
 <span id="L208" class="LineNr">208 </span>  assume-resources [
 <span id="L209" class="LineNr">209 </span>  ]
 <span id="L210" class="LineNr">210 </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="L211" class="LineNr">211 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L211" class="LineNr">211 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L212" class="LineNr">212 </span>  <span class="Comment"># create 2 sandboxes and scroll to second</span>
 <span id="L213" class="LineNr">213 </span>  assume-console [
 <span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> press ctrl-n
@@ -319,7 +319,7 @@ if ('onhashchange' in window) {
 <span id="L257" class="LineNr">257 </span>  assume-resources [
 <span id="L258" class="LineNr">258 </span>  ]
 <span id="L259" class="LineNr">259 </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="L260" class="LineNr">260 </span>  <a href='004-programming-environment.mu.html#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L260" class="LineNr">260 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L261" class="LineNr">261 </span>  <span class="Comment"># create 2 sandboxes</span>
 <span id="L262" class="LineNr">262 </span>  assume-console [
 <span id="L263" class="LineNr">263 </span>  <span class="Conceal">¦</span> press ctrl-n
diff --git a/html/edit/009-sandbox-test.mu.html b/html/edit/009-sandbox-test.mu.html
index cd2c66ae..baa7c1ba 100644
--- a/html/edit/009-sandbox-test.mu.html
+++ b/html/edit/009-sandbox-test.mu.html
@@ -174,7 +174,7 @@ if ('onhashchange' in window) {
 <span id="L111" class="LineNr">111 </span>]
 <span id="L112" class="LineNr">112 </span>
 <span id="L113" class="LineNr">113 </span><span class="Comment"># clicks on sandbox responses save it as 'expected'</span>
-<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="L114" class="LineNr">114 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L76'>&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>  <span class="Conceal">¦</span> sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
@@ -194,7 +194,7 @@ if ('onhashchange' in window) {
 <span id="L131" class="LineNr">131 </span>  <span class="Conceal">¦</span> sandbox <span class="Special">&lt;-</span> <a href='009-sandbox-test.mu.html#L165'>toggle-expected-response</a> sandbox
 <span id="L132" class="LineNr">132 </span>  <span class="Conceal">¦</span> <a href='005-sandbox.mu.html#L220'>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#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#L121'>render</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> <a href='004-programming-environment.mu.html#L495'>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#L4'>screen</a> <span class="Special">&lt;-</span> <a href='004-programming-environment.mu.html#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
 <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>]
diff --git a/html/edit/010-sandbox-trace.mu.html b/html/edit/010-sandbox-trace.mu.html
index 592e0a72..e1a98ad8 100644
--- a/html/edit/010-sandbox-trace.mu.html
+++ b/html/edit/010-sandbox-trace.mu.html
@@ -243,7 +243,7 @@ if ('onhashchange' in window) {
 <span id="L180" class="LineNr">180 </span>]
 <span id="L181" class="LineNr">181 </span>
 <span id="L182" class="LineNr">182 </span><span class="Comment"># clicks on sandbox code toggle its display-trace? flag</span>
-<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="L183" class="LineNr">183 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L76'>&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>  <span class="Conceal">¦</span> sandbox-left-margin:num <span class="Special">&lt;-</span> get *current-sandbox, <span class="Constant">left:offset</span>
@@ -264,7 +264,7 @@ if ('onhashchange' in window) {
 <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#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#L121'>render</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> <a href='004-programming-environment.mu.html#L495'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
+<span id="L204" class="LineNr">204 </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#L446'>update-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
 <span id="L205" class="LineNr">205 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-event</span>
 <span id="L206" class="LineNr">206 </span>  <span class="Delimiter">}</span>
 <span id="L207" class="LineNr">207 </span>]
diff --git a/html/edit/011-errors.mu.html b/html/edit/011-errors.mu.html
index 1b775585..f40faa20 100644
--- a/html/edit/011-errors.mu.html
+++ b/html/edit/011-errors.mu.html
@@ -86,7 +86,7 @@ if ('onhashchange' in window) {
 <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>]
 <span id="L25" class="LineNr"> 25 </span>
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+<span id="L26" class="LineNr"> 26 </span><span class="muRecipe">before</span> <span class="Constant"><a href='004-programming-environment.mu.html#L404'>&lt;render-components-end&gt;</a></span> [
 <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>
@@ -95,7 +95,7 @@ if ('onhashchange' in window) {
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 <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#L472'>&lt;render-recipe-components-end&gt;</a></span> [
+<span id="L35" class="LineNr"> 35 </span><span class="muRecipe">before</span> <span class="Constant"><a href='004-programming-environment.mu.html#L423'>&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>  <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
@@ -124,7 +124,7 @@ if ('onhashchange' in window) {
 <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#L453'>&lt;render-components-end&gt;</a></span> [
+<span id="L64" class="LineNr"> 64 </span><span class="muRecipe">before</span> <span class="Constant"><a href='004-programming-environment.mu.html#L404'>&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="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>
@@ -189,7 +189,7 @@ if ('onhashchange' in window) {
 <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#L432'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
+<span id="L129" class="LineNr">129 </span>  <a href='004-programming-environment.mu.html#L383'>render-all</a> <a href='../081print.mu.html#L4'>screen</a>, env, <a href='001-editor.mu.html#L121'>render</a>
 <span id="L130" class="LineNr">130 </span>  screen-should-contain [
 <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>