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-rw-r--r--021check_instruction.cc25
-rw-r--r--html/021check_instruction.cc.html343
-rw-r--r--html/031merge.cc.html4
-rw-r--r--html/032array.cc.html2
-rw-r--r--html/054static_dispatch.cc.html2
5 files changed, 199 insertions, 177 deletions
diff --git a/021check_instruction.cc b/021check_instruction.cc
index b8aa3663..a32c6178 100644
--- a/021check_instruction.cc
+++ b/021check_instruction.cc
@@ -79,6 +79,14 @@ def main [
 +mem: storing 12 in location 2
 $error: 0
 
+:(scenario write_address_to_character_disallowed)
+% Hide_errors = true;
+def main [
+  1:address:num <- copy 12/unsafe
+  2:char <- copy 1:address:num
+]
++error: main: can't copy '1:address:num' to '2:char'; types don't match
+
 :(scenario write_boolean_to_number_allowed)
 def main [
   1:bool <- copy 1/true
@@ -87,21 +95,20 @@ def main [
 +mem: storing 1 in location 2
 $error: 0
 
-:(scenario write_number_to_boolean_allowed)
+:(scenario write_number_to_boolean_disallowed)
+% Hide_errors = true;
 def main [
   1:num <- copy 34
   2:bool <- copy 1:num
 ]
-+mem: storing 34 in location 2
-$error: 0
++error: main: can't copy '1:num' to '2:bool'; types don't match
 
 :(code)
 // types_match with some leniency
 bool types_coercible(const reagent& to, const reagent& from) {
   if (types_match(to, from)) return true;
-  if (is_mu_address(from) && is_mu_number(to)) return true;
-  if (is_mu_boolean(from) && is_mu_number(to)) return true;
-  if (is_mu_number(from) && is_mu_boolean(to)) return true;
+  if (is_mu_address(from) && is_real_mu_number(to)) return true;
+  if (is_mu_boolean(from) && is_real_mu_number(to)) return true;
   // End types_coercible Special-cases
   return false;
 }
@@ -223,6 +230,11 @@ bool is_mu_boolean(reagent/*copy*/ r) {
 }
 
 bool is_mu_number(reagent/*copy*/ r) {
+  if (is_mu_character(r.type)) return true;  // permit arithmetic on unicode code points
+  return is_real_mu_number(r);
+}
+
+bool is_real_mu_number(reagent/*copy*/ r) {
   // End Preprocess is_mu_number(reagent r)
   if (!r.type) return false;
   if (!r.type->atom) return false;
@@ -230,7 +242,6 @@ bool is_mu_number(reagent/*copy*/ r) {
     return r.type->name == "literal-fractional-number"
         || r.type->name == "literal";
   }
-  if (r.type->value == get(Type_ordinal, "character")) return true;  // permit arithmetic on unicode code points
   return r.type->value == get(Type_ordinal, "number");
 }
 
diff --git a/html/021check_instruction.cc.html b/html/021check_instruction.cc.html
index a057ef83..b5b14ad7 100644
--- a/html/021check_instruction.cc.html
+++ b/html/021check_instruction.cc.html
@@ -142,183 +142,194 @@ if ('onhashchange' in window) {
 <span id="L79" class="LineNr"> 79 </span><span class="traceContains">+mem: storing 12 in location 2</span>
 <span id="L80" class="LineNr"> 80 </span>$error: <span class="Constant">0</span>
 <span id="L81" class="LineNr"> 81 </span>
-<span id="L82" class="LineNr"> 82 </span><span class="Delimiter">:(scenario write_boolean_to_number_allowed)</span>
-<span id="L83" class="LineNr"> 83 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
-<span id="L84" class="LineNr"> 84 </span>  <span class="Constant">1</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>copy <span class="Constant">1</span>/<span class="Constant">true</span>
-<span id="L85" class="LineNr"> 85 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:<span class="Normal">bool</span>
-<span id="L86" class="LineNr"> 86 </span>]
-<span id="L87" class="LineNr"> 87 </span><span class="traceContains">+mem: storing 1 in location 2</span>
-<span id="L88" class="LineNr"> 88 </span>$error: <span class="Constant">0</span>
+<span id="L82" class="LineNr"> 82 </span><span class="Delimiter">:(scenario write_address_to_character_disallowed)</span>
+<span id="L83" class="LineNr"> 83 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L84" class="LineNr"> 84 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
+<span id="L85" class="LineNr"> 85 </span>  <span class="Constant">1</span>:<a href='043space.cc.html#L76'>address</a>:num<span class="Special"> &lt;- </span>copy <span class="Constant">12</span>/unsafe
+<span id="L86" class="LineNr"> 86 </span>  <span class="Constant">2</span>:<span class="Normal">char</span><span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:<a href='043space.cc.html#L76'>address</a>:num
+<span id="L87" class="LineNr"> 87 </span>]
+<span id="L88" class="LineNr"> 88 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: can't copy '1:<a href='043space.cc.html#L76'>address</a>:num' to '2:char'; types don't match</span>
 <span id="L89" class="LineNr"> 89 </span>
-<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(scenario write_number_to_boolean_allowed)</span>
+<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">:(scenario write_boolean_to_number_allowed)</span>
 <span id="L91" class="LineNr"> 91 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
-<span id="L92" class="LineNr"> 92 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
-<span id="L93" class="LineNr"> 93 </span>  <span class="Constant">2</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:num
+<span id="L92" class="LineNr"> 92 </span>  <span class="Constant">1</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>copy <span class="Constant">1</span>/<span class="Constant">true</span>
+<span id="L93" class="LineNr"> 93 </span>  <span class="Constant">2</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:<span class="Normal">bool</span>
 <span id="L94" class="LineNr"> 94 </span>]
-<span id="L95" class="LineNr"> 95 </span><span class="traceContains">+mem: storing 34 in location 2</span>
+<span id="L95" class="LineNr"> 95 </span><span class="traceContains">+mem: storing 1 in location 2</span>
 <span id="L96" class="LineNr"> 96 </span>$error: <span class="Constant">0</span>
 <span id="L97" class="LineNr"> 97 </span>
-<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(code)</span>
-<span id="L99" class="LineNr"> 99 </span><span class="Comment">// types_match with some leniency</span>
-<span id="L100" class="LineNr">100 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L101" class="LineNr">101 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L109'>types_match</a><span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L102" class="LineNr">102 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L225'>is_mu_number</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L103" class="LineNr">103 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L217'>is_mu_boolean</a><span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L225'>is_mu_number</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L104" class="LineNr">104 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L225'>is_mu_number</a><span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L217'>is_mu_boolean</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L105" class="LineNr">105 </span>  <span class="Comment">// End types_coercible Special-cases</span>
-<span id="L106" class="LineNr">106 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L107" class="LineNr">107 </span><span class="Delimiter">}</span>
-<span id="L108" class="LineNr">108 </span>
-<span id="L109" class="LineNr">109 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L109'>types_match</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L110" class="LineNr">110 </span>  <span class="Comment">// to sidestep type-checking, use /unsafe in the source.</span>
-<span id="L111" class="LineNr">111 </span>  <span class="Comment">// this will be highlighted in red inside vim. just for setting up some tests.</span>
-<span id="L112" class="LineNr">112 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L183'>is_unsafe</a><span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L113" class="LineNr">113 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Matching Types For Literal(to)</span>
-<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span> <span class="Comment">// allow writing 0 to any address</span>
-<span id="L117" class="LineNr">117 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
-<span id="L118" class="LineNr">118 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L119" class="LineNr">119 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">))</span>
-<span id="L120" class="LineNr">120 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
-<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>to<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// literals are always scalars</span>
-<span id="L122" class="LineNr">122 </span>  <span class="Delimiter">}</span>
-<span id="L123" class="LineNr">123 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">);</span>
-<span id="L124" class="LineNr">124 </span><span class="Delimiter">}</span>
-<span id="L125" class="LineNr">125 </span>
-<span id="L126" class="LineNr">126 </span><span class="Comment">//: copy arguments for later layers</span>
-<span id="L127" class="LineNr">127 </span><span class="Normal">bool</span> types_strictly_match<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> to<span class="Delimiter">,</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L128" class="LineNr">128 </span>  <span class="Comment">// End Preprocess types_strictly_match(reagent to, reagent from)</span>
-<span id="L129" class="LineNr">129 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">.</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// error</span>
-<span id="L130" class="LineNr">130 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L131" class="LineNr">131 </span>  <span class="Comment">// to sidestep type-checking, use /unsafe in the source.</span>
-<span id="L132" class="LineNr">132 </span>  <span class="Comment">// this will be highlighted in red inside vim. just for setting up some tests.</span>
-<span id="L133" class="LineNr">133 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L183'>is_unsafe</a><span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L134" class="LineNr">134 </span>  <span class="Comment">// '_' never raises type error</span>
-<span id="L135" class="LineNr">135 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L136" class="LineNr">136 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> !from<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
-<span id="L137" class="LineNr">137 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">,</span> from<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L138" class="LineNr">138 </span><span class="Delimiter">}</span>
-<span id="L139" class="LineNr">139 </span>
-<span id="L140" class="LineNr">140 </span><span class="Normal">bool</span> types_strictly_match<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* to<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L141" class="LineNr">141 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from == to<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L142" class="LineNr">142 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L143" class="LineNr">143 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!from<span class="Delimiter">)</span> <span class="Identifier">return</span> to<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">;</span>
-<span id="L144" class="LineNr">144 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom != to<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L145" class="LineNr">145 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>name == to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
-<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>value == to<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
-<span id="L148" class="LineNr">148 </span>  <span class="Delimiter">}</span>
-<span id="L149" class="LineNr">149 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>right<span class="Delimiter">))</span>
-<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L151" class="LineNr">151 </span>  <span class="Comment">// fallback: (x) == x</span>
-<span id="L152" class="LineNr">152 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L153" class="LineNr">153 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
-<span id="L154" class="LineNr">154 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L155" class="LineNr">155 </span><span class="Delimiter">}</span>
-<span id="L156" class="LineNr">156 </span>
-<span id="L157" class="LineNr">157 </span><span class="Normal">void</span> <a href='021check_instruction.cc.html#L157'>test_unknown_type_does_not_match_unknown_type</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L158" class="LineNr">158 </span>  reagent a<span class="Delimiter">(</span><span class="Constant">&quot;a:foo&quot;</span><span class="Delimiter">);</span>
-<span id="L159" class="LineNr">159 </span>  reagent b<span class="Delimiter">(</span><span class="Constant">&quot;b:bar&quot;</span><span class="Delimiter">);</span>
-<span id="L160" class="LineNr">160 </span>  <a href='002test.cc.html#L25'>CHECK</a><span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>a<span class="Delimiter">,</span> b<span class="Delimiter">));</span>
-<span id="L161" class="LineNr">161 </span><span class="Delimiter">}</span>
-<span id="L162" class="LineNr">162 </span>
-<span id="L163" class="LineNr">163 </span><span class="Normal">void</span> <a href='021check_instruction.cc.html#L163'>test_unknown_type_matches_itself</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L164" class="LineNr">164 </span>  reagent a<span class="Delimiter">(</span><span class="Constant">&quot;a:foo&quot;</span><span class="Delimiter">);</span>
-<span id="L165" class="LineNr">165 </span>  reagent b<span class="Delimiter">(</span><span class="Constant">&quot;b:foo&quot;</span><span class="Delimiter">);</span>
-<span id="L166" class="LineNr">166 </span>  <a href='002test.cc.html#L25'>CHECK</a><span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>a<span class="Delimiter">,</span> b<span class="Delimiter">));</span>
-<span id="L167" class="LineNr">167 </span><span class="Delimiter">}</span>
-<span id="L168" class="LineNr">168 </span>
-<span id="L169" class="LineNr">169 </span><span class="Normal">void</span> <a href='021check_instruction.cc.html#L169'>test_type_abbreviations_match_raw_types</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
-<span id="L170" class="LineNr">170 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> <span class="Constant">&quot;text&quot;</span><span class="Delimiter">,</span> <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span><span class="Constant">&quot;address:array:character&quot;</span><span class="Delimiter">));</span>
-<span id="L171" class="LineNr">171 </span>  <span class="Comment">// a has type (address buffer (address array character))</span>
-<span id="L172" class="LineNr">172 </span>  reagent a<span class="Delimiter">(</span><span class="Constant">&quot;a:<a href='043space.cc.html#L76'>address</a>:buffer:text&quot;</span><span class="Delimiter">);</span>
-<span id="L173" class="LineNr">173 </span>  expand_type_abbreviations<span class="Delimiter">(</span>a<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L174" class="LineNr">174 </span>  <span class="Comment">// b has type (address buffer address array character)</span>
-<span id="L175" class="LineNr">175 </span>  reagent b<span class="Delimiter">(</span><span class="Constant">&quot;b:<a href='043space.cc.html#L76'>address</a>:buffer:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">);</span>
-<span id="L176" class="LineNr">176 </span>  <a href='002test.cc.html#L25'>CHECK</a><span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>a<span class="Delimiter">,</span> b<span class="Delimiter">));</span>
-<span id="L177" class="LineNr">177 </span>  <span class="Normal">delete</span> Type_abbreviations[<span class="Constant">&quot;text&quot;</span>]<span class="Delimiter">;</span>
-<span id="L178" class="LineNr">178 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> <span class="Constant">&quot;text&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">);</span>
-<span id="L179" class="LineNr">179 </span><span class="Delimiter">}</span>
-<span id="L180" class="LineNr">180 </span>
-<span id="L181" class="LineNr">181 </span><span class="Comment">//: helpers</span>
-<span id="L182" class="LineNr">182 </span>
-<span id="L183" class="LineNr">183 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L183'>is_unsafe</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L184" class="LineNr">184 </span>  <span class="Identifier">return</span> has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;unsafe&quot;</span><span class="Delimiter">);</span>
-<span id="L185" class="LineNr">185 </span><span class="Delimiter">}</span>
-<span id="L186" class="LineNr">186 </span>
-<span id="L187" class="LineNr">187 </span><span class="Normal">bool</span> is_mu_array<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L188" class="LineNr">188 </span>  <span class="Comment">// End Preprocess is_mu_array(reagent r)</span>
-<span id="L189" class="LineNr">189 </span>  <span class="Identifier">return</span> is_mu_array<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L190" class="LineNr">190 </span><span class="Delimiter">}</span>
-<span id="L191" class="LineNr">191 </span><span class="Normal">bool</span> is_mu_array<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L192" class="LineNr">192 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L193" class="LineNr">193 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L194" class="LineNr">194 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L195" class="LineNr">195 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L197'>end</a><span class="Delimiter">();</span>
-<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</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="Identifier">return</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
-<span id="L200" class="LineNr">200 </span><span class="Delimiter">}</span>
-<span id="L201" class="LineNr">201 </span>
-<span id="L202" class="LineNr">202 </span><span class="Normal">bool</span> is_mu_address<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L203" class="LineNr">203 </span>  <span class="Comment">// End Preprocess is_mu_address(reagent r)</span>
-<span id="L204" class="LineNr">204 </span>  <span class="Identifier">return</span> is_mu_address<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L205" class="LineNr">205 </span><span class="Delimiter">}</span>
-<span id="L206" class="LineNr">206 </span><span class="Normal">bool</span> is_mu_address<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L207" class="LineNr">207 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L208" class="LineNr">208 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L209" class="LineNr">209 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L210" class="LineNr">210 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L197'>end</a><span class="Delimiter">();</span>
-<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L213" class="LineNr">213 </span>  <span class="Delimiter">}</span>
-<span id="L214" class="LineNr">214 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
-<span id="L215" class="LineNr">215 </span><span class="Delimiter">}</span>
-<span id="L216" class="LineNr">216 </span>
-<span id="L217" class="LineNr">217 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L217'>is_mu_boolean</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L218" class="LineNr">218 </span>  <span class="Comment">// End Preprocess is_mu_boolean(reagent r)</span>
-<span id="L219" class="LineNr">219 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L220" class="LineNr">220 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L221" class="LineNr">221 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L222" class="LineNr">222 </span>  <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">);</span>
-<span id="L223" class="LineNr">223 </span><span class="Delimiter">}</span>
-<span id="L224" class="LineNr">224 </span>
-<span id="L225" class="LineNr">225 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L225'>is_mu_number</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L226" class="LineNr">226 </span>  <span class="Comment">// End Preprocess is_mu_number(reagent r)</span>
-<span id="L227" class="LineNr">227 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L98" class="LineNr"> 98 </span><span class="Delimiter">:(scenario write_number_to_boolean_disallowed)</span>
+<span id="L99" class="LineNr"> 99 </span><span class="Special">% Hide_errors = true;</span>
+<span id="L100" class="LineNr">100 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
+<span id="L101" class="LineNr">101 </span>  <span class="Constant">1</span>:num<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
+<span id="L102" class="LineNr">102 </span>  <span class="Constant">2</span>:<span class="Normal">bool</span><span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:num
+<span id="L103" class="LineNr">103 </span>]
+<span id="L104" class="LineNr">104 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: can't copy '1:num' to '2:bool'; types don't match</span>
+<span id="L105" class="LineNr">105 </span>
+<span id="L106" class="LineNr">106 </span><span class="Delimiter">:(code)</span>
+<span id="L107" class="LineNr">107 </span><span class="Comment">// types_match with some leniency</span>
+<span id="L108" class="LineNr">108 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L108'>types_coercible</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L109" class="LineNr">109 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L116'>types_match</a><span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L110" class="LineNr">110 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L237'>is_real_mu_number</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L111" class="LineNr">111 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L224'>is_mu_boolean</a><span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L237'>is_real_mu_number</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L112" class="LineNr">112 </span>  <span class="Comment">// End types_coercible Special-cases</span>
+<span id="L113" class="LineNr">113 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L114" class="LineNr">114 </span><span class="Delimiter">}</span>
+<span id="L115" class="LineNr">115 </span>
+<span id="L116" class="LineNr">116 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L116'>types_match</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L117" class="LineNr">117 </span>  <span class="Comment">// to sidestep type-checking, use /unsafe in the source.</span>
+<span id="L118" class="LineNr">118 </span>  <span class="Comment">// this will be highlighted in red inside vim. just for setting up some tests.</span>
+<span id="L119" class="LineNr">119 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L190'>is_unsafe</a><span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L120" class="LineNr">120 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L121" class="LineNr">121 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L122" class="LineNr">122 </span>  <span class="Conceal">¦</span> <span class="Comment">// End Matching Types For Literal(to)</span>
+<span id="L123" class="LineNr">123 </span>  <span class="Conceal">¦</span> <span class="Comment">// allow writing 0 to any address</span>
+<span id="L124" class="LineNr">124 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span><span class="Delimiter">;</span>
+<span id="L125" class="LineNr">125 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L126" class="LineNr">126 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">))</span>
+<span id="L127" class="LineNr">127 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
+<span id="L128" class="LineNr">128 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>to<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// literals are always scalars</span>
+<span id="L129" class="LineNr">129 </span>  <span class="Delimiter">}</span>
+<span id="L130" class="LineNr">130 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">);</span>
+<span id="L131" class="LineNr">131 </span><span class="Delimiter">}</span>
+<span id="L132" class="LineNr">132 </span>
+<span id="L133" class="LineNr">133 </span><span class="Comment">//: copy arguments for later layers</span>
+<span id="L134" class="LineNr">134 </span><span class="Normal">bool</span> types_strictly_match<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> to<span class="Delimiter">,</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L135" class="LineNr">135 </span>  <span class="Comment">// End Preprocess types_strictly_match(reagent to, reagent from)</span>
+<span id="L136" class="LineNr">136 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">.</span>type == <span class="Constant">NULL</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>  <span class="Comment">// error</span>
+<span id="L137" class="LineNr">137 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; to<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L138" class="LineNr">138 </span>  <span class="Comment">// to sidestep type-checking, use /unsafe in the source.</span>
+<span id="L139" class="LineNr">139 </span>  <span class="Comment">// this will be highlighted in red inside vim. just for setting up some tests.</span>
+<span id="L140" class="LineNr">140 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L190'>is_unsafe</a><span class="Delimiter">(</span>from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L141" class="LineNr">141 </span>  <span class="Comment">// '_' never raises type error</span>
+<span id="L142" class="LineNr">142 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>to<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L143" class="LineNr">143 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> !from<span class="Delimiter">.</span>type<span class="Delimiter">;</span>
+<span id="L144" class="LineNr">144 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">,</span> from<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L145" class="LineNr">145 </span><span class="Delimiter">}</span>
+<span id="L146" class="LineNr">146 </span>
+<span id="L147" class="LineNr">147 </span><span class="Normal">bool</span> types_strictly_match<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* to<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L148" class="LineNr">148 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from == to<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L149" class="LineNr">149 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!to<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L150" class="LineNr">150 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!from<span class="Delimiter">)</span> <span class="Identifier">return</span> to<span class="Delimiter">-&gt;</span>atom &amp;&amp; to<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">;</span>
+<span id="L151" class="LineNr">151 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom != to<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L152" class="LineNr">152 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>name == to<span class="Delimiter">-&gt;</span>name<span class="Delimiter">;</span>
+<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">-&gt;</span>value == to<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+<span id="L155" class="LineNr">155 </span>  <span class="Delimiter">}</span>
+<span id="L156" class="LineNr">156 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>right<span class="Delimiter">))</span>
+<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L158" class="LineNr">158 </span>  <span class="Comment">// fallback: (x) == x</span>
+<span id="L159" class="LineNr">159 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> from<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L160" class="LineNr">160 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>from<span class="Delimiter">-&gt;</span>right == <span class="Constant">NULL</span> &amp;&amp; types_strictly_match<span class="Delimiter">(</span>to<span class="Delimiter">,</span> from<span class="Delimiter">-&gt;</span>left<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L162" class="LineNr">162 </span><span class="Delimiter">}</span>
+<span id="L163" class="LineNr">163 </span>
+<span id="L164" class="LineNr">164 </span><span class="Normal">void</span> <a href='021check_instruction.cc.html#L164'>test_unknown_type_does_not_match_unknown_type</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L165" class="LineNr">165 </span>  reagent a<span class="Delimiter">(</span><span class="Constant">&quot;a:foo&quot;</span><span class="Delimiter">);</span>
+<span id="L166" class="LineNr">166 </span>  reagent b<span class="Delimiter">(</span><span class="Constant">&quot;b:bar&quot;</span><span class="Delimiter">);</span>
+<span id="L167" class="LineNr">167 </span>  <a href='002test.cc.html#L25'>CHECK</a><span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>a<span class="Delimiter">,</span> b<span class="Delimiter">));</span>
+<span id="L168" class="LineNr">168 </span><span class="Delimiter">}</span>
+<span id="L169" class="LineNr">169 </span>
+<span id="L170" class="LineNr">170 </span><span class="Normal">void</span> <a href='021check_instruction.cc.html#L170'>test_unknown_type_matches_itself</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L171" class="LineNr">171 </span>  reagent a<span class="Delimiter">(</span><span class="Constant">&quot;a:foo&quot;</span><span class="Delimiter">);</span>
+<span id="L172" class="LineNr">172 </span>  reagent b<span class="Delimiter">(</span><span class="Constant">&quot;b:foo&quot;</span><span class="Delimiter">);</span>
+<span id="L173" class="LineNr">173 </span>  <a href='002test.cc.html#L25'>CHECK</a><span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>a<span class="Delimiter">,</span> b<span class="Delimiter">));</span>
+<span id="L174" class="LineNr">174 </span><span class="Delimiter">}</span>
+<span id="L175" class="LineNr">175 </span>
+<span id="L176" class="LineNr">176 </span><span class="Normal">void</span> <a href='021check_instruction.cc.html#L176'>test_type_abbreviations_match_raw_types</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
+<span id="L177" class="LineNr">177 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> <span class="Constant">&quot;text&quot;</span><span class="Delimiter">,</span> <a href='018type_abbreviations.cc.html#L58'>new_type_tree</a><span class="Delimiter">(</span><span class="Constant">&quot;address:array:character&quot;</span><span class="Delimiter">));</span>
+<span id="L178" class="LineNr">178 </span>  <span class="Comment">// a has type (address buffer (address array character))</span>
+<span id="L179" class="LineNr">179 </span>  reagent a<span class="Delimiter">(</span><span class="Constant">&quot;a:<a href='043space.cc.html#L76'>address</a>:buffer:text&quot;</span><span class="Delimiter">);</span>
+<span id="L180" class="LineNr">180 </span>  expand_type_abbreviations<span class="Delimiter">(</span>a<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L181" class="LineNr">181 </span>  <span class="Comment">// b has type (address buffer address array character)</span>
+<span id="L182" class="LineNr">182 </span>  reagent b<span class="Delimiter">(</span><span class="Constant">&quot;b:<a href='043space.cc.html#L76'>address</a>:buffer:<a href='043space.cc.html#L76'>address</a>:array:character&quot;</span><span class="Delimiter">);</span>
+<span id="L183" class="LineNr">183 </span>  <a href='002test.cc.html#L25'>CHECK</a><span class="Delimiter">(</span>types_strictly_match<span class="Delimiter">(</span>a<span class="Delimiter">,</span> b<span class="Delimiter">));</span>
+<span id="L184" class="LineNr">184 </span>  <span class="Normal">delete</span> Type_abbreviations[<span class="Constant">&quot;text&quot;</span>]<span class="Delimiter">;</span>
+<span id="L185" class="LineNr">185 </span>  <a href='001help.cc.html#L221'>put</a><span class="Delimiter">(</span>Type_abbreviations<span class="Delimiter">,</span> <span class="Constant">&quot;text&quot;</span><span class="Delimiter">,</span> <span class="Constant">NULL</span><span class="Delimiter">);</span>
+<span id="L186" class="LineNr">186 </span><span class="Delimiter">}</span>
+<span id="L187" class="LineNr">187 </span>
+<span id="L188" class="LineNr">188 </span><span class="Comment">//: helpers</span>
+<span id="L189" class="LineNr">189 </span>
+<span id="L190" class="LineNr">190 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L190'>is_unsafe</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L191" class="LineNr">191 </span>  <span class="Identifier">return</span> has_property<span class="Delimiter">(</span>r<span class="Delimiter">,</span> <span class="Constant">&quot;unsafe&quot;</span><span class="Delimiter">);</span>
+<span id="L192" class="LineNr">192 </span><span class="Delimiter">}</span>
+<span id="L193" class="LineNr">193 </span>
+<span id="L194" class="LineNr">194 </span><span class="Normal">bool</span> is_mu_array<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L195" class="LineNr">195 </span>  <span class="Comment">// End Preprocess is_mu_array(reagent r)</span>
+<span id="L196" class="LineNr">196 </span>  <span class="Identifier">return</span> is_mu_array<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L197" class="LineNr">197 </span><span class="Delimiter">}</span>
+<span id="L198" class="LineNr">198 </span><span class="Normal">bool</span> is_mu_array<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L199" class="LineNr">199 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L200" class="LineNr">200 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L201" class="LineNr">201 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L202" class="LineNr">202 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L203" class="LineNr">203 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L197'>end</a><span class="Delimiter">();</span>
+<span id="L204" class="LineNr">204 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L205" class="LineNr">205 </span>  <span class="Delimiter">}</span>
+<span id="L206" class="LineNr">206 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;array&quot;</span><span class="Delimiter">);</span>
+<span id="L207" class="LineNr">207 </span><span class="Delimiter">}</span>
+<span id="L208" class="LineNr">208 </span>
+<span id="L209" class="LineNr">209 </span><span class="Normal">bool</span> is_mu_address<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L210" class="LineNr">210 </span>  <span class="Comment">// End Preprocess is_mu_address(reagent r)</span>
+<span id="L211" class="LineNr">211 </span>  <span class="Identifier">return</span> is_mu_address<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L212" class="LineNr">212 </span><span class="Delimiter">}</span>
+<span id="L213" class="LineNr">213 </span><span class="Normal">bool</span> is_mu_address<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L214" class="LineNr">214 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L215" class="LineNr">215 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L216" class="LineNr">216 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L217" class="LineNr">217 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L218" class="LineNr">218 </span>  <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> &lt;&lt; <span class="Constant">&quot;invalid type &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; <a href='003trace.cc.html#L197'>end</a><span class="Delimiter">();</span>
+<span id="L219" class="LineNr">219 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L220" class="LineNr">220 </span>  <span class="Delimiter">}</span>
+<span id="L221" class="LineNr">221 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">);</span>
+<span id="L222" class="LineNr">222 </span><span class="Delimiter">}</span>
+<span id="L223" class="LineNr">223 </span>
+<span id="L224" class="LineNr">224 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L224'>is_mu_boolean</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L225" class="LineNr">225 </span>  <span class="Comment">// End Preprocess is_mu_boolean(reagent r)</span>
+<span id="L226" class="LineNr">226 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L227" class="LineNr">227 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L228" class="LineNr">228 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L229" class="LineNr">229 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal-fractional-number&quot;</span>
-<span id="L231" class="LineNr">231 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">;</span>
-<span id="L232" class="LineNr">232 </span>  <span class="Delimiter">}</span>
-<span id="L233" class="LineNr">233 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>  <span class="Comment">// permit arithmetic on unicode code points</span>
-<span id="L234" class="LineNr">234 </span>  <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">);</span>
+<span id="L229" class="LineNr">229 </span>  <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;boolean&quot;</span><span class="Delimiter">);</span>
+<span id="L230" class="LineNr">230 </span><span class="Delimiter">}</span>
+<span id="L231" class="LineNr">231 </span>
+<span id="L232" class="LineNr">232 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L232'>is_mu_number</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L233" class="LineNr">233 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_character<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>  <span class="Comment">// permit arithmetic on unicode code points</span>
+<span id="L234" class="LineNr">234 </span>  <span class="Identifier">return</span> <a href='021check_instruction.cc.html#L237'>is_real_mu_number</a><span class="Delimiter">(</span>r<span class="Delimiter">);</span>
 <span id="L235" class="LineNr">235 </span><span class="Delimiter">}</span>
 <span id="L236" class="LineNr">236 </span>
-<span id="L237" class="LineNr">237 </span><span class="Normal">bool</span> is_mu_character<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L238" class="LineNr">238 </span>  <span class="Comment">// End Preprocess is_mu_character(reagent r)</span>
-<span id="L239" class="LineNr">239 </span>  <span class="Identifier">return</span> is_mu_character<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L240" class="LineNr">240 </span><span class="Delimiter">}</span>
-<span id="L241" class="LineNr">241 </span><span class="Normal">bool</span> is_mu_character<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L242" class="LineNr">242 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L243" class="LineNr">243 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L244" class="LineNr">244 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L245" class="LineNr">245 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">);</span>
+<span id="L237" class="LineNr">237 </span><span class="Normal">bool</span> <a href='021check_instruction.cc.html#L237'>is_real_mu_number</a><span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L238" class="LineNr">238 </span>  <span class="Comment">// End Preprocess is_mu_number(reagent r)</span>
+<span id="L239" class="LineNr">239 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L240" class="LineNr">240 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L241" class="LineNr">241 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>r<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+<span id="L242" class="LineNr">242 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal-fractional-number&quot;</span>
+<span id="L243" class="LineNr">243 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> || r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">;</span>
+<span id="L244" class="LineNr">244 </span>  <span class="Delimiter">}</span>
+<span id="L245" class="LineNr">245 </span>  <span class="Identifier">return</span> r<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;number&quot;</span><span class="Delimiter">);</span>
 <span id="L246" class="LineNr">246 </span><span class="Delimiter">}</span>
 <span id="L247" class="LineNr">247 </span>
-<span id="L248" class="LineNr">248 </span><span class="Normal">bool</span> is_mu_scalar<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L249" class="LineNr">249 </span>  <span class="Identifier">return</span> is_mu_scalar<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
-<span id="L250" class="LineNr">250 </span><span class="Delimiter">}</span>
-<span id="L251" class="LineNr">251 </span><span class="Normal">bool</span> is_mu_scalar<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L252" class="LineNr">252 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L253" class="LineNr">253 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L248" class="LineNr">248 </span><span class="Normal">bool</span> is_mu_character<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L249" class="LineNr">249 </span>  <span class="Comment">// End Preprocess is_mu_character(reagent r)</span>
+<span id="L250" class="LineNr">250 </span>  <span class="Identifier">return</span> is_mu_character<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L251" class="LineNr">251 </span><span class="Delimiter">}</span>
+<span id="L252" class="LineNr">252 </span><span class="Normal">bool</span> is_mu_character<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L253" class="LineNr">253 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
 <span id="L254" class="LineNr">254 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
-<span id="L255" class="LineNr">255 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span>
-<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">;</span>
-<span id="L257" class="LineNr">257 </span>  <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>type<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>
-<span id="L258" class="LineNr">258 </span><span class="Delimiter">}</span>
+<span id="L255" class="LineNr">255 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L256" class="LineNr">256 </span>  <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>value == get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;character&quot;</span><span class="Delimiter">);</span>
+<span id="L257" class="LineNr">257 </span><span class="Delimiter">}</span>
+<span id="L258" class="LineNr">258 </span>
+<span id="L259" class="LineNr">259 </span><span class="Normal">bool</span> is_mu_scalar<span class="Delimiter">(</span>reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L260" class="LineNr">260 </span>  <span class="Identifier">return</span> is_mu_scalar<span class="Delimiter">(</span>r<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+<span id="L261" class="LineNr">261 </span><span class="Delimiter">}</span>
+<span id="L262" class="LineNr">262 </span><span class="Normal">bool</span> is_mu_scalar<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* type<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span id="L263" class="LineNr">263 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L264" class="LineNr">264 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_address<span class="Delimiter">(</span>type<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
+<span id="L265" class="LineNr">265 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>atom<span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
+<span id="L266" class="LineNr">266 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>type<span class="Delimiter">))</span>
+<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> type<span class="Delimiter">-&gt;</span>name != <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">;</span>
+<span id="L268" class="LineNr">268 </span>  <span class="Identifier">return</span> size_of<span class="Delimiter">(</span>type<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">;</span>
+<span id="L269" class="LineNr">269 </span><span class="Delimiter">}</span>
 </pre>
 </body>
 </html>
diff --git a/html/031merge.cc.html b/html/031merge.cc.html
index f78f61c5..f6e38b17 100644
--- a/html/031merge.cc.html
+++ b/html/031merge.cc.html
@@ -223,12 +223,12 @@ if ('onhashchange' in window) {
 <span id="L158" class="LineNr">158 </span>  <span class="Conceal">¦</span> <span class="Normal">switch</span> <span class="Delimiter">(</span>container_info<span class="Delimiter">.</span>kind<span class="Delimiter">)</span> <span class="Delimiter">{</span>
 <span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">case</span> <a href='010vm.cc.html#L173'>CONTAINER</a>: <span class="Delimiter">{</span>
 <span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// degenerate case: merge with the same type always succeeds</span>
-<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span> &amp;&amp; <a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
+<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index == <span class="Constant">0</span> &amp;&amp; <a href='021check_instruction.cc.html#L108'>types_coercible</a><span class="Delimiter">(</span>container<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span>
 <span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
 <span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> reagent&amp; expected_ingredient = <a href='030container.cc.html#L429'>element_type</a><span class="Delimiter">(</span>container<span class="Delimiter">.</span>type<span class="Delimiter">,</span> state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">);</span>
 <span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking container &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>container<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; || &quot;</span> &lt;&lt; <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; vs ingredient &quot;</span> &lt;&lt; ingredient_index &lt;&lt; <a href='003trace.cc.html#L197'>end</a><span class="Delimiter">();</span>
 <span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// if the current element is the ingredient we expect, move on to the next element/ingredient</span>
-<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L100'>types_coercible</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
+<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='021check_instruction.cc.html#L108'>types_coercible</a><span class="Delimiter">(</span>expected_ingredient<span class="Delimiter">,</span> ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
 <span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++ingredient_index<span class="Delimiter">;</span>
 <span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> ++state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index<span class="Delimiter">;</span>
 <span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">while</span> <span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container_element_index &gt;= <a href='001help.cc.html#L141'>SIZE</a><span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get_base_type<span class="Delimiter">(</span>state<span class="Delimiter">.</span>data<span class="Delimiter">.</span>top<span class="Delimiter">().</span>container<span class="Delimiter">.</span>type<span class="Delimiter">)-&gt;</span>value<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
diff --git a/html/032array.cc.html b/html/032array.cc.html
index abe96768..a75e343b 100644
--- a/html/032array.cc.html
+++ b/html/032array.cc.html
@@ -164,7 +164,7 @@ if ('onhashchange' in window) {
 <span id="L99" class="LineNr"> 99 </span>]
 <span id="L100" class="LineNr">100 </span><span class="traceContains">+app: foo: 3 14 15 16</span>
 <span id="L101" class="LineNr">101 </span>
-<span id="L102" class="LineNr">102 </span><span class="Delimiter">:(before &quot;End <a href='021check_instruction.cc.html#L100'>types_coercible</a> Special-cases&quot;)</span>
+<span id="L102" class="LineNr">102 </span><span class="Delimiter">:(before &quot;End <a href='021check_instruction.cc.html#L108'>types_coercible</a> Special-cases&quot;)</span>
 <span id="L103" class="LineNr">103 </span><span class="Normal">if</span> <span class="Delimiter">(</span>is_mu_array<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; is_mu_array<span class="Delimiter">(</span>to<span class="Delimiter">))</span>
 <span id="L104" class="LineNr">104 </span>  <span class="Identifier">return</span> types_strictly_match<span class="Delimiter">(</span><a href='032array.cc.html#L382'>array_element</a><span class="Delimiter">(</span>from<span class="Delimiter">.</span>type<span class="Delimiter">),</span> <a href='032array.cc.html#L382'>array_element</a><span class="Delimiter">(</span>to<span class="Delimiter">.</span>type<span class="Delimiter">));</span>
 <span id="L105" class="LineNr">105 </span>
diff --git a/html/054static_dispatch.cc.html b/html/054static_dispatch.cc.html
index 25a0a461..9112499b 100644
--- a/html/054static_dispatch.cc.html
+++ b/html/054static_dispatch.cc.html
@@ -357,7 +357,7 @@ if ('onhashchange' in window) {
 <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="Normal">bool</span> <a href='054static_dispatch.cc.html#L294'>types_strictly_match_except_literal_against_address_or_boolean</a><span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; to<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; from<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-<span id="L295" class="LineNr">295 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L217'>is_mu_boolean</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span>
+<span id="L295" class="LineNr">295 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; <a href='021check_instruction.cc.html#L224'>is_mu_boolean</a><span class="Delimiter">(</span>to<span class="Delimiter">))</span>
 <span id="L296" class="LineNr">296 </span>  <span class="Conceal">¦</span> <span class="Identifier">return</span> from<span class="Delimiter">.</span>name == <span class="Constant">&quot;0&quot;</span> || from<span class="Delimiter">.</span>name == <span class="Constant">&quot;1&quot;</span><span class="Delimiter">;</span>
 <span id="L297" class="LineNr">297 </span>  <span class="Comment">// Match Literal Zero Against Address {</span>
 <span id="L298" class="LineNr">298 </span>  <span class="Normal">if</span> <span class="Delimiter">(</span>is_literal<span class="Delimiter">(</span>from<span class="Delimiter">)</span> &amp;&amp; is_mu_address<span class="Delimiter">(</span>to<span class="Delimiter">))</span>