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-rw-r--r--html/030container.cc.html461
1 files changed, 297 insertions, 164 deletions
diff --git a/html/030container.cc.html b/html/030container.cc.html
index 7d0d4a26..403c6a60 100644
--- a/html/030container.cc.html
+++ b/html/030container.cc.html
@@ -13,15 +13,15 @@
 pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
 body { font-family: monospace; color: #eeeeee; background-color: #080808; }
 * { font-size: 1.05em; }
+.traceContains { color: #008000; }
 .SalientComment { color: #00ffff; }
-.traceAbsent { color: #c00000; }
 .cSpecial { color: #008000; }
+.traceAbsent { color: #c00000; }
 .Comment { color: #9090ff; }
 .Delimiter { color: #a04060; }
 .Special { color: #ff6060; }
 .Identifier { color: #804000; }
 .Constant { color: #00a0a0; }
-.traceContains { color: #008000; }
 -->
 </style>
 
@@ -37,21 +37,21 @@ body { font-family: monospace; color: #eeeeee; background-color: #080808; }
 
 <span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
 <span class="Comment">//: We'll use this container as a running example, with two number elements.</span>
-type_ordinal point = Type_ordinal[<span class="Constant">&quot;point&quot;</span>] = Next_type_ordinal++<span class="Delimiter">;</span>
-Type[point]<span class="Delimiter">.</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
-Type[point]<span class="Delimiter">.</span>kind = container<span class="Delimiter">;</span>
-Type[point]<span class="Delimiter">.</span>name = <span class="Constant">&quot;point&quot;</span><span class="Delimiter">;</span>
-vector&lt;type_ordinal&gt; i<span class="Delimiter">;</span>
-i<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>number<span class="Delimiter">);</span>
-Type[point]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
-Type[point]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
+type_ordinal point = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;point&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
+get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>kind = CONTAINER<span class="Delimiter">;</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>name = <span class="Constant">&quot;point&quot;</span><span class="Delimiter">;</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new type_tree<span class="Delimiter">(</span>number<span class="Delimiter">));</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;x&quot;</span><span class="Delimiter">);</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new type_tree<span class="Delimiter">(</span>number<span class="Delimiter">));</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point<span class="Delimiter">).</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;y&quot;</span><span class="Delimiter">);</span>
 
 <span class="Comment">//: Containers can be copied around with a single instruction just like</span>
 <span class="Comment">//: numbers, no matter how large they are.</span>
 
 <span class="Comment">//: Tests in this layer often explicitly setup memory before reading it as a</span>
 <span class="Comment">//: container. Don't do this in general. I'm tagging exceptions with /raw to</span>
-<span class="Comment">//: avoid warnings.</span>
+<span class="Comment">//: avoid errors.</span>
 <span class="Delimiter">:(scenario copy_multiple_locations)</span>
 recipe main [
   <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
@@ -61,27 +61,25 @@ recipe main [
 <span class="traceContains">+mem: storing 34 in location 3</span>
 <span class="traceContains">+mem: storing 35 in location 4</span>
 
-<span class="Comment">//: trying to copy to a differently-sized destination will fail</span>
+<span class="Comment">//: trying to copy to a differently-typed destination will fail</span>
 <span class="Delimiter">:(scenario copy_checks_size)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Constant">2</span>:point<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>:number
 ]
-<span class="traceContains">+warn: main: size mismatch in storing to 2:point (2 vs 1) at '2:point &lt;- copy 1:number'</span>
+<span class="traceContains">+error: main: can't copy 1:number to 2:point; types don't match</span>
 
 <span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
 <span class="Comment">// A more complex container, containing another container as one of its</span>
 <span class="Comment">// elements.</span>
-type_ordinal point_number = Type_ordinal[<span class="Constant">&quot;point-number&quot;</span>] = Next_type_ordinal++<span class="Delimiter">;</span>
-Type[point_number]<span class="Delimiter">.</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
-Type[point_number]<span class="Delimiter">.</span>kind = container<span class="Delimiter">;</span>
-Type[point_number]<span class="Delimiter">.</span>name = <span class="Constant">&quot;point-number&quot;</span><span class="Delimiter">;</span>
-vector&lt;type_ordinal&gt; p2<span class="Delimiter">;</span>
-p2<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>point<span class="Delimiter">);</span>
-Type[point_number]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>p2<span class="Delimiter">);</span>
-vector&lt;type_ordinal&gt; i2<span class="Delimiter">;</span>
-i2<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>number<span class="Delimiter">);</span>
-Type[point_number]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>i2<span class="Delimiter">);</span>
+type_ordinal point_number = put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;point-number&quot;</span><span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
+get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>size = <span class="Constant">2</span><span class="Delimiter">;</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>kind = CONTAINER<span class="Delimiter">;</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>name = <span class="Constant">&quot;point-number&quot;</span><span class="Delimiter">;</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new type_tree<span class="Delimiter">(</span>point<span class="Delimiter">));</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;xy&quot;</span><span class="Delimiter">);</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new type_tree<span class="Delimiter">(</span>number<span class="Delimiter">));</span>
+get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> point_number<span class="Delimiter">).</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;z&quot;</span><span class="Delimiter">);</span>
 
 <span class="Delimiter">:(scenario copy_handles_nested_container_elements)</span>
 recipe main [
@@ -119,17 +117,26 @@ recipe main [
 ]
 <span class="traceContains">+mem: storing 0 in location 7</span>
 
-<span class="Delimiter">:(before &quot;End size_of(types) Cases&quot;)</span>
-type_info t = Type[types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">;</span>
-if <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+<span class="Delimiter">:(before &quot;End size_of(type) Cases&quot;)</span>
+if <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  <span class="Comment">// error value, but we'll raise it elsewhere</span>
+  <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+if <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+  <span class="Identifier">return</span> <span class="Constant">1</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+type_info t = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+if <span class="Delimiter">(</span>t<span class="Delimiter">.</span>kind == CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
   <span class="Comment">// size of a container is the sum of the sizes of its elements</span>
   long long int result = <span class="Constant">0</span><span class="Delimiter">;</span>
   for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
     <span class="Comment">// todo: strengthen assertion to disallow mutual type recursion</span>
-    if <span class="Delimiter">(</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
-      raise &lt;&lt; <span class="Constant">&quot;container &quot;</span> &lt;&lt; t<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; can't include itself as a member</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
+    if <span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)-&gt;</span>value == type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      raise_error &lt;&lt; <span class="Constant">&quot;container &quot;</span> &lt;&lt; t<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; can't include itself as a member</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
       <span class="Identifier">return</span> <span class="Constant">0</span><span class="Delimiter">;</span>
     <span class="Delimiter">}</span>
+    <span class="Comment">// End size_of(type) Container Cases</span>
     result += size_of<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
   <span class="Delimiter">}</span>
   <span class="Identifier">return</span> result<span class="Delimiter">;</span>
@@ -156,48 +163,81 @@ recipe main [
 <span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
 GET<span class="Delimiter">,</span>
 <span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-Recipe_ordinal[<span class="Constant">&quot;get&quot;</span>] = GET<span class="Delimiter">;</span>
-<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;get&quot;</span><span class="Delimiter">,</span> GET<span class="Delimiter">);</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 case GET: <span class="Delimiter">{</span>
-  if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>ingredients<span class="Delimiter">)</span> != <span class="Constant">2</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: 'get' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>to_string<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>
+  if <span class="Delimiter">(</span>SIZE<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>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>to_string<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 class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  reagent base = 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>
-  long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
-  if <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; 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>to_string<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>
+  reagent base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// new copy for every invocation</span>
+  <span class="Comment">// Update GET base in Check</span>
+  if <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type || !base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind != CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get' should be a container, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+    <span class="Identifier">break</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+  reagent offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'get' should have type 'offset', but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+    <span class="Identifier">break</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  long long int offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span>  <span class="Comment">// later layers permit non-integer offsets</span>
+    offset_value = to_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+  else
+    offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset &quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot; for &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
     <span class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  if <span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || Type[base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">.</span>kind != container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; current_recipe_name <span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: first ingredient of 'get' should be a container, but got &quot;</span> &lt;&lt; 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>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  reagent product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  <span class="Comment">// Update GET product in Check</span>
+  const reagent element = element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset_value<span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>product<span class="Delimiter">,</span> element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get' &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot;) on &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; can't be saved in &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;; type should be &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; but is &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>product<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
     <span class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  type_ordinal base_type = base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-  if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: second ingredient of 'get' should have type 'offset', but got &quot;</span> &lt;&lt; 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>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+case GET: <span class="Delimiter">{</span>
+  reagent base = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  <span class="Comment">// Update GET base in Run</span>
+  long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<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>to_string<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 class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
+  type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
   long long int offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>offset &lt; <span class="Constant">0</span> || offset &gt;= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// copied from Check above</span>
   long long int src = base_address<span class="Delimiter">;</span>
   for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; offset<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    src += size_of<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+    <span class="Comment">// End GET field Cases</span>
+    src += size_of<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
   <span class="Delimiter">}</span>
-  trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; src &lt;&lt; end<span class="Delimiter">();</span>
-  if <span class="Delimiter">(</span>offset &lt; <span class="Constant">0</span> || offset &gt;= SIZE<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: invalid offset &quot;</span> &lt;&lt; offset &lt;&lt; <span class="Constant">&quot; for &quot;</span> &lt;&lt; Type[base_type]<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
-    <span class="Identifier">break</span><span class="Delimiter">;</span>
-  <span class="Delimiter">}</span>
-  type_ordinal src_type = Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset<span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-  trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;its type is &quot;</span> &lt;&lt; Type[src_type]<span class="Delimiter">.</span>name &lt;&lt; end<span class="Delimiter">();</span>
-  reagent tmp<span class="Delimiter">;</span>
+  trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; src &lt;&lt; end<span class="Delimiter">();</span>
+  reagent tmp = element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset<span class="Delimiter">);</span>
   tmp<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>src<span class="Delimiter">);</span>
-  tmp<span class="Delimiter">.</span>types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>src_type<span class="Delimiter">);</span>
+  trace<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;its type is &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>tmp<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
   products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>read_memory<span class="Delimiter">(</span>tmp<span class="Delimiter">));</span>
   <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span class="Delimiter">}</span>
 
+<span class="Delimiter">:(code)</span>
+const reagent element_type<span class="Delimiter">(</span>const reagent&amp; canonized_base<span class="Delimiter">,</span> long long int offset_value<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>offset_value &gt;= <span class="Constant">0</span><span class="Delimiter">);</span>
+  assert<span class="Delimiter">(</span>contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> canonized_base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">));</span>
+  assert<span class="Delimiter">(</span>!get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> canonized_base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  const type_info&amp; info = get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> canonized_base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+  assert<span class="Delimiter">(</span>info<span class="Delimiter">.</span>kind == CONTAINER<span class="Delimiter">);</span>
+  reagent element<span class="Delimiter">;</span>
+  element<span class="Delimiter">.</span>type = new type_tree<span class="Delimiter">(</span>*info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>offset_value<span class="Delimiter">));</span>
+  <span class="Comment">// End element_type Special-cases</span>
+  <span class="Identifier">return</span> element<span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
 <span class="Delimiter">:(scenario get_handles_nested_container_elements)</span>
 recipe main [
   <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
@@ -207,92 +247,143 @@ recipe main [
 ]
 <span class="traceContains">+mem: storing 36 in location 15</span>
 
-<span class="SalientComment">//:: To write to elements of containers, you need their address.</span>
-
-<span class="Delimiter">:(scenario get_address)</span>
+<span class="Delimiter">:(scenario get_out_of_bounds)</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
   <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
-  <span class="Constant">15</span>:address:number<span class="Special"> &lt;- </span>get-address <span class="Constant">12</span>:point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset  <span class="Comment"># unsafe</span>
+  <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>
+  get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">2</span>:offset  <span class="Comment"># point-number occupies 3 locations but has only 2 fields; out of bounds</span>
 ]
-<span class="traceContains">+mem: storing 13 in location 15</span>
+<span class="traceContains">+error: main: invalid offset 2 for point-number</span>
 
-<span class="Delimiter">:(scenario get_out_of_bounds)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Delimiter">:(scenario get_out_of_bounds_2)</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
   <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
   <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>
-  get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">2</span>:offset  <span class="Comment"># point-number occupies 3 locations but has only 2 fields; out of bounds</span>
+  get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> -<span class="Constant">1</span>:offset
 ]
-<span class="traceContains">+warn: main: invalid offset 2 for point-number</span>
+<span class="traceContains">+error: main: invalid offset -1 for point-number</span>
 
-<span class="Delimiter">:(scenario get_out_of_bounds_2)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Delimiter">:(scenario get_product_type_mismatch)</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
   <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
   <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>
-  get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> -<span class="Constant">1</span>:offset
+  <span class="Constant">15</span>:address:number<span class="Special"> &lt;- </span>get <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
+]
+<span class="traceContains">+error: main: 'get' 1:offset (1) on point-number can't be saved in 15:address:number; type should be number but is &lt;address : &lt;number : &lt;&gt;&gt;&gt;</span>
+
+<span class="SalientComment">//:: To write to elements of containers, you need their address.</span>
+
+<span class="Delimiter">:(scenario get_address)</span>
+recipe main [
+  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
+  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
+  <span class="Constant">15</span>:address:number<span class="Special"> &lt;- </span>get-address <span class="Constant">12</span>:point/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset  <span class="Comment"># unsafe</span>
 ]
-<span class="traceContains">+warn: main: invalid offset -1 for point-number</span>
+<span class="traceContains">+mem: storing 13 in location 15</span>
 
 <span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
 GET_ADDRESS<span class="Delimiter">,</span>
 <span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-Recipe_ordinal[<span class="Constant">&quot;get-address&quot;</span>] = GET_ADDRESS<span class="Delimiter">;</span>
-<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;get-address&quot;</span><span class="Delimiter">,</span> GET_ADDRESS<span class="Delimiter">);</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
 case GET_ADDRESS: <span class="Delimiter">{</span>
-  reagent base = 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>
-  long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
-  if <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; 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>to_string<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>
+  if <span class="Delimiter">(</span>SIZE<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>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get-address' expects exactly 2 ingredients in '&quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>to_string<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 class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  if <span class="Delimiter">(</span>base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> || Type[base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span>]<span class="Delimiter">.</span>kind != container<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; current_recipe_name <span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: first ingredient of 'get-address' should be a container, but got &quot;</span> &lt;&lt; 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>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  reagent base = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  <span class="Comment">// Update GET_ADDRESS base in Check</span>
+  if <span class="Delimiter">(</span>!base<span class="Delimiter">.</span>type || get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">).</span>kind != CONTAINER<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;first ingredient of 'get-address' should be a container, but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
     <span class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  type_ordinal base_type = base<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-  if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)))</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; current_recipe_name<span class="Delimiter">()</span> &lt;&lt; <span class="Constant">&quot;: second ingredient of 'get-address' should have type 'offset', but got &quot;</span> &lt;&lt; current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+  reagent offset = inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>!is_literal<span class="Delimiter">(</span>offset<span class="Delimiter">)</span> || !is_mu_scalar<span class="Delimiter">(</span>offset<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;second ingredient of 'get' should have type 'offset', but got &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>original_string &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
     <span class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
-  assert<span class="Delimiter">(</span>scalar<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">)));</span>
-  long long int offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
-  if <span class="Delimiter">(</span>offset &lt; <span class="Constant">0</span> || offset &gt;= SIZE<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-    raise &lt;&lt; <span class="Constant">&quot;invalid offset &quot;</span> &lt;&lt; offset &lt;&lt; <span class="Constant">&quot; for &quot;</span> &lt;&lt; Type[base_type]<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  long long int offset_value = <span class="Constant">0</span><span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>is_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>  <span class="Comment">// later layers permit non-integer offsets</span>
+    offset_value = to_integer<span class="Delimiter">(</span>offset<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+    if <span class="Delimiter">(</span>offset_value &lt; <span class="Constant">0</span> || offset_value &gt;= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+      raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;invalid offset &quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot; for &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+      <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Delimiter">}</span>
+  <span class="Delimiter">}</span>
+  else <span class="Delimiter">{</span>
+    offset_value = offset<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  reagent product = inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  <span class="Comment">// Update GET_ADDRESS product in Check</span>
+  <span class="Comment">// same type as for GET..</span>
+  reagent element = element_type<span class="Delimiter">(</span>base<span class="Delimiter">,</span> offset_value<span class="Delimiter">);</span>
+  <span class="Comment">// ..except for an address at the start</span>
+  element<span class="Delimiter">.</span>type = new type_tree<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;address&quot;</span><span class="Delimiter">),</span> element<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>product<span class="Delimiter">,</span> element<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'get-address' &quot;</span> &lt;&lt; offset<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot; (&quot;</span> &lt;&lt; offset_value &lt;&lt; <span class="Constant">&quot;) on &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>name &lt;&lt; <span class="Constant">&quot; can't be saved in &quot;</span> &lt;&lt; product<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;; type should be &quot;</span> &lt;&lt; debug_string<span class="Delimiter">(</span>element<span class="Delimiter">.</span>type<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+    <span class="Identifier">break</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+case GET_ADDRESS: <span class="Delimiter">{</span>
+  reagent base = current_instruction<span class="Delimiter">().</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  <span class="Comment">// Update GET_ADDRESS base in Run</span>
+  long long int base_address = base<span class="Delimiter">.</span>value<span class="Delimiter">;</span>
+  if <span class="Delimiter">(</span>base_address == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    raise_error &lt;&lt; maybe<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>to_string<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 class="Identifier">break</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
+  type_ordinal base_type = base<span class="Delimiter">.</span>type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">;</span>
+  long long int offset = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>offset &lt; <span class="Constant">0</span> || offset &gt;= SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>  <span class="Comment">// copied from Check above</span>
   long long int result = base_address<span class="Delimiter">;</span>
   for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; offset<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    result += size_of<span class="Delimiter">(</span>Type[base_type]<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+    <span class="Comment">// End GET_ADDRESS field Cases</span>
+    result += size_of<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> base_type<span class="Delimiter">).</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
   <span class="Delimiter">}</span>
-  trace<span class="Delimiter">(</span>Primitive_recipe_depth<span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; result &lt;&lt; end<span class="Delimiter">();</span>
+  trace<span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">&quot;run&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;address to copy is &quot;</span> &lt;&lt; result &lt;&lt; end<span class="Delimiter">();</span>
   products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
   products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
   <span class="Identifier">break</span><span class="Delimiter">;</span>
 <span class="Delimiter">}</span>
 
 <span class="Delimiter">:(scenario get_address_out_of_bounds)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
   <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
   <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>
   get-address <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">2</span>:offset  <span class="Comment"># point-number occupies 3 locations but has only 2 fields; out of bounds</span>
 ]
-<span class="traceContains">+warn: invalid offset 2 for point-number</span>
+<span class="traceContains">+error: main: invalid offset 2 for point-number</span>
 
 <span class="Delimiter">:(scenario get_address_out_of_bounds_2)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
   <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
   <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>
   get-address <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> -<span class="Constant">1</span>:offset
 ]
-<span class="traceContains">+warn: invalid offset -1 for point-number</span>
+<span class="traceContains">+error: main: invalid offset -1 for point-number</span>
+
+<span class="Delimiter">:(scenario get_address_product_type_mismatch)</span>
+<span class="Special">% Hide_errors = true;</span>
+recipe main [
+  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
+  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">35</span>
+  <span class="Constant">14</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">36</span>
+  <span class="Constant">15</span>:number<span class="Special"> &lt;- </span>get-address <span class="Constant">12</span>:point-number/<span class="Special">raw</span><span class="Delimiter">,</span> <span class="Constant">1</span>:offset
+]
+<span class="traceContains">+error: main: 'get-address' 1:offset (1) on point-number can't be saved in 15:number; type should be &lt;address : &lt;number : &lt;&gt;&gt;&gt;</span>
 
 <span class="SalientComment">//:: Allow containers to be defined in mu code.</span>
 
@@ -302,11 +393,11 @@ container foo [
   x:number
   y:number
 ]
-<span class="traceContains">+parse: reading container foo</span>
-<span class="traceContains">+parse:   element name: x</span>
-<span class="traceContains">+parse:   type: 1</span>
-<span class="traceContains">+parse:   element name: y</span>
-<span class="traceContains">+parse:   type: 1</span>
+<span class="traceContains">+parse: --- defining container foo</span>
+<span class="traceContains">+parse: element name: x</span>
+<span class="traceContains">+parse: type: 1</span>
+<span class="traceContains">+parse: element name: y</span>
+<span class="traceContains">+parse: type: 1</span>
 
 <span class="Delimiter">:(scenario container_use_before_definition)</span>
 container foo [
@@ -318,57 +409,66 @@ container bar [
   x:number
   y:number
 ]
-<span class="traceContains">+parse: reading container foo</span>
+<span class="traceContains">+parse: --- defining container foo</span>
 <span class="traceContains">+parse: type number: 1000</span>
 <span class="traceContains">+parse:   element name: x</span>
 <span class="traceContains">+parse:   type: 1</span>
 <span class="traceContains">+parse:   element name: y</span>
 <span class="traceContains">+parse:   type: 1001</span>
-<span class="traceContains">+parse: reading container bar</span>
+<span class="traceContains">+parse: --- defining container bar</span>
 <span class="traceContains">+parse: type number: 1001</span>
 
 <span class="Delimiter">:(before &quot;End Command Handlers&quot;)</span>
 else if <span class="Delimiter">(</span>command == <span class="Constant">&quot;container&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-  insert_container<span class="Delimiter">(</span>command<span class="Delimiter">,</span> container<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
+  insert_container<span class="Delimiter">(</span>command<span class="Delimiter">,</span> CONTAINER<span class="Delimiter">,</span> in<span class="Delimiter">);</span>
 <span class="Delimiter">}</span>
 
 <span class="Delimiter">:(code)</span>
 void insert_container<span class="Delimiter">(</span>const string&amp; command<span class="Delimiter">,</span> kind_of_type kind<span class="Delimiter">,</span> istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
   skip_whitespace<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
   string name = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-  trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;reading &quot;</span> &lt;&lt; command &lt;&lt; <span class="Constant">' '</span> &lt;&lt; name &lt;&lt; end<span class="Delimiter">();</span>
-  if <span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">.</span>find<span class="Delimiter">(</span>name<span class="Delimiter">)</span> == Type_ordinal<span class="Delimiter">.</span>end<span class="Delimiter">()</span>
-      || Type_ordinal[name] == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    Type_ordinal[name] = Next_type_ordinal++<span class="Delimiter">;</span>
+  <span class="Comment">// End container Name Refinements</span>
+  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- defining &quot;</span> &lt;&lt; command &lt;&lt; <span class="Constant">' '</span> &lt;&lt; name &lt;&lt; end<span class="Delimiter">();</span>
+  if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span>
+      || get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
   <span class="Delimiter">}</span>
-  trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type number: &quot;</span> &lt;&lt; Type_ordinal[name] &lt;&lt; end<span class="Delimiter">();</span>
+  trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;type number: &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
   skip_bracket<span class="Delimiter">(</span>in<span class="Delimiter">,</span> <span class="Constant">&quot;'container' must begin with '['&quot;</span><span class="Delimiter">);</span>
-  type_info&amp; t = Type[Type_ordinal[name]]<span class="Delimiter">;</span>
-  recently_added_types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>Type_ordinal[name]<span class="Delimiter">);</span>
-  t<span class="Delimiter">.</span>name = name<span class="Delimiter">;</span>
-  t<span class="Delimiter">.</span>kind = kind<span class="Delimiter">;</span>
+  type_info&amp; info = get_or_insert<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
+  recently_added_types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> name<span class="Delimiter">));</span>
+  info<span class="Delimiter">.</span>name = name<span class="Delimiter">;</span>
+  info<span class="Delimiter">.</span>kind = kind<span class="Delimiter">;</span>
   while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
     skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
     string element = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
     if <span class="Delimiter">(</span>element == <span class="Constant">&quot;]&quot;</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
+    <span class="Comment">// End insert_container Special Definitions(element)</span>
     istringstream inner<span class="Delimiter">(</span>element<span class="Delimiter">);</span>
-    t<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>inner<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">));</span>
-    trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  element name: &quot;</span> &lt;&lt; t<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>back<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
-    vector&lt;type_ordinal&gt; types<span class="Delimiter">;</span>
-    while <span class="Delimiter">(</span>!inner<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
+    info<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>slurp_until<span class="Delimiter">(</span>inner<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">));</span>
+    trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  element name: &quot;</span> &lt;&lt; info<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>back<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
+    type_tree* new_type = <span class="Constant">NULL</span><span class="Delimiter">;</span>
+    for <span class="Delimiter">(</span>type_tree** curr_type = &amp;new_type<span class="Delimiter">;</span> !inner<span class="Delimiter">.</span>eof<span class="Delimiter">();</span> curr_type = &amp;<span class="Delimiter">(</span>*curr_type<span class="Delimiter">)-&gt;</span>right<span class="Delimiter">)</span> <span class="Delimiter">{</span>
       string type_name = slurp_until<span class="Delimiter">(</span>inner<span class="Delimiter">,</span> <span class="Constant">':'</span><span class="Delimiter">);</span>
-      if <span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">.</span>find<span class="Delimiter">(</span>type_name<span class="Delimiter">)</span> == Type_ordinal<span class="Delimiter">.</span>end<span class="Delimiter">()</span>
+      <span class="Comment">// End insert_container Special Uses(type_name)</span>
+      if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">)</span>
           <span class="Comment">// types can contain integers, like for array sizes</span>
           &amp;&amp; !is_integer<span class="Delimiter">(</span>type_name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
-        Type_ordinal[type_name] = Next_type_ordinal++<span class="Delimiter">;</span>
+        put<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">,</span> Next_type_ordinal++<span class="Delimiter">);</span>
       <span class="Delimiter">}</span>
-      types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>Type_ordinal[type_name]<span class="Delimiter">);</span>
-      trace<span class="Delimiter">(</span><span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  type: &quot;</span> &lt;&lt; types<span class="Delimiter">.</span>back<span class="Delimiter">()</span> &lt;&lt; end<span class="Delimiter">();</span>
+      *curr_type = new type_tree<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">));</span>
+      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;parse&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;  type: &quot;</span> &lt;&lt; get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">)</span> &lt;&lt; end<span class="Delimiter">();</span>
     <span class="Delimiter">}</span>
-    t<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>types<span class="Delimiter">);</span>
+    info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>new_type<span class="Delimiter">);</span>
   <span class="Delimiter">}</span>
-  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">)</span> == SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>element_names<span class="Delimiter">));</span>
-  t<span class="Delimiter">.</span>size = SIZE<span class="Delimiter">(</span>t<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>
+  assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">)</span> == SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>element_names<span class="Delimiter">));</span>
+  info<span class="Delimiter">.</span>size = SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span>
+<span class="Delimiter">}</span>
+
+void skip_bracket<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> string message<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
+    raise_error &lt;&lt; message &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
 <span class="Delimiter">}</span>
 
 <span class="Delimiter">:(scenarios run)</span>
@@ -397,7 +497,12 @@ vector&lt;type_ordinal&gt; recently_added_types<span class="Delimiter">;</span>
 recently_added_types<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
 <span class="Delimiter">:(before &quot;End Setup&quot;)</span>  <span class="Comment">//: for tests</span>
 for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>recently_added_types<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-  Type_ordinal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>Type[recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span>]<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
+  if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
+  Type_ordinal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)).</span>name<span class="Delimiter">);</span>
+  <span class="Comment">// todo: why do I explicitly need to provide this?</span>
+  for <span class="Delimiter">(</span>long long int j = <span class="Constant">0</span><span class="Delimiter">;</span> j &lt; SIZE<span class="Delimiter">(</span>Type<span class="Delimiter">.</span>at<span class="Delimiter">(</span>recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)).</span>elements<span class="Delimiter">);</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    delete Type<span class="Delimiter">.</span>at<span class="Delimiter">(</span>recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)).</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>j<span class="Delimiter">);</span>
+  <span class="Delimiter">}</span>
   Type<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>recently_added_types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
 <span class="Delimiter">}</span>
 recently_added_types<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
@@ -411,9 +516,7 @@ while<span class="Delimiter">(</span>p != Type_ordinal<span class="Delimiter">.<
   <span class="Comment">// increment iterator</span>
   ++p<span class="Delimiter">;</span>
   <span class="Comment">// now delete current item if necessary</span>
-  if <span class="Delimiter">(</span>t &gt;= <span class="Constant">1000</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    Type_ordinal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>name<span class="Delimiter">);</span>
-  <span class="Delimiter">}</span>
+  if <span class="Delimiter">(</span>t &gt;= <span class="Constant">1000</span><span class="Delimiter">)</span> Type_ordinal<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>name<span class="Delimiter">);</span>
 <span class="Delimiter">}</span>
 <span class="Comment">//: lastly, ensure scenarios are consistent by always starting them at the</span>
 <span class="Comment">//: same type number.</span>
@@ -423,60 +526,72 @@ assert<span class="Delimiter">(</span>Next_type_ordinal &lt; <span class="Consta
 <span class="Delimiter">:(before &quot;End Setup&quot;)</span>
 Next_type_ordinal = <span class="Constant">1000</span><span class="Delimiter">;</span>
 
-<span class="SalientComment">//:: Allow container definitions anywhere in the codebase, but warn if you</span>
-<span class="SalientComment">//:: can't find a definition.</span>
+<span class="SalientComment">//:: Allow container definitions anywhere in the codebase, but complain if you</span>
+<span class="SalientComment">//:: can't find a definition at the end.</span>
 
-<span class="Delimiter">:(scenario run_warns_on_unknown_types)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Delimiter">:(scenario run_complains_on_unknown_types)</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
   <span class="Comment"># integer is not a type</span>
   <span class="Constant">1</span>:integer<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
 ]
-<span class="traceContains">+warn: unknown type: integer</span>
+<span class="traceContains">+error: main: unknown type in '1:integer &lt;- copy 0'</span>
 
 <span class="Delimiter">:(scenario run_allows_type_definition_after_use)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Special">% Hide_errors = true;</span>
 recipe main [
-  <span class="Constant">1</span>:bar<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
+  <span class="Constant">1</span>:bar<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>/<span class="Special">raw</span>
 ]
 
 container bar [
   x:number
 ]
-<span class="traceAbsent">-warn: unknown type: bar</span>
-$warn: <span class="Constant">0</span>
+<span class="traceAbsent">-error: unknown type: bar</span>
+$error: <span class="Constant">0</span>
 
-<span class="Delimiter">:(after &quot;int main&quot;)</span>
-  Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_invalid_types<span class="Delimiter">);</span>
+<span class="Delimiter">:(after &quot;Begin Transforms&quot;)</span>
+Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>check_or_set_invalid_types<span class="Delimiter">);</span>  <span class="Comment">// idempotent</span>
 
 <span class="Delimiter">:(code)</span>
-void check_invalid_types<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-  for <span class="Delimiter">(</span>long long int index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    const instruction&amp; inst = Recipe[r]<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+void check_or_set_invalid_types<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  for <span class="Delimiter">(</span>long long int index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    const instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
     for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-      check_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+      check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">,</span>
+                                 maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">),</span> <span class="Constant">&quot;'&quot;</span>+inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
     <span class="Delimiter">}</span>
     for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-      check_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+      check_or_set_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">,</span>
+                                 maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">),</span> <span class="Constant">&quot;'&quot;</span>+inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
     <span class="Delimiter">}</span>
   <span class="Delimiter">}</span>
 <span class="Delimiter">}</span>
 
-void check_invalid_types<span class="Delimiter">(</span>const reagent&amp; r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-  for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-    if <span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-    if <span class="Delimiter">(</span>Type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>r<span class="Delimiter">.</span>types<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> == Type<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
-      raise &lt;&lt; <span class="Constant">&quot;unknown type: &quot;</span> &lt;&lt; r<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+void check_or_set_invalid_types<span class="Delimiter">(</span>type_tree* type<span class="Delimiter">,</span> const string_tree* type_name<span class="Delimiter">,</span> const string&amp; block<span class="Delimiter">,</span> const string&amp; name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  <span class="Comment">// can't assert that type_name is non-null, even at the top of a recursive call tree</span>
+  if <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// will throw a more precise error elsewhere</span>
+  <span class="Comment">// End Container Type Checks</span>
+  if <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+    <span class="Identifier">return</span><span class="Delimiter">;</span>
   <span class="Delimiter">}</span>
+  if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    if <span class="Delimiter">(</span>type_name &amp;&amp; contains_key<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span>
+      type<span class="Delimiter">-&gt;</span>value = get<span class="Delimiter">(</span>Type_ordinal<span class="Delimiter">,</span> type_name<span class="Delimiter">-&gt;</span>value<span class="Delimiter">);</span>
+    else
+      raise_error &lt;&lt; block &lt;&lt; <span class="Constant">&quot;unknown type in &quot;</span> &lt;&lt; name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  <span class="Delimiter">}</span>
+  check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> type_name ? type_name<span class="Delimiter">-&gt;</span>left : <span class="Constant">NULL</span><span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
+  check_or_set_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> type_name ? type_name<span class="Delimiter">-&gt;</span>right : <span class="Constant">NULL</span><span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
 <span class="Delimiter">}</span>
 
 <span class="Delimiter">:(scenario container_unknown_field)</span>
-<span class="Special">% Hide_warnings = true;</span>
+<span class="Special">% Hide_errors = true;</span>
 container foo [
   x:number
   y:bar
 ]
-<span class="traceContains">+warn: unknown type for field y in foo</span>
+<span class="traceContains">+error: foo: unknown type in y</span>
 
 <span class="Delimiter">:(scenario read_container_with_bracket_in_comment)</span>
 container foo [
@@ -484,35 +599,62 @@ container foo [
   <span class="Comment"># ']' in comment</span>
   y:number
 ]
-<span class="traceContains">+parse: reading container foo</span>
-<span class="traceContains">+parse:   element name: x</span>
-<span class="traceContains">+parse:   type: 1</span>
-<span class="traceContains">+parse:   element name: y</span>
-<span class="traceContains">+parse:   type: 1</span>
+<span class="traceContains">+parse: --- defining container foo</span>
+<span class="traceContains">+parse: element name: x</span>
+<span class="traceContains">+parse: type: 1</span>
+<span class="traceContains">+parse: element name: y</span>
+<span class="traceContains">+parse: type: 1</span>
 
-<span class="Delimiter">:(before &quot;End Transform&quot;)</span>
+<span class="Delimiter">:(before &quot;End Transform All&quot;)</span>
 check_container_field_types<span class="Delimiter">();</span>
 
 <span class="Delimiter">:(code)</span>
 void check_container_field_types<span class="Delimiter">()</span> <span class="Delimiter">{</span>
   for <span class="Delimiter">(</span>map&lt;type_ordinal<span class="Delimiter">,</span> type_info&gt;::iterator p = Type<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Type<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
     const type_info&amp; info = p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">;</span>
-    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-      for <span class="Delimiter">(</span>long long int j = <span class="Constant">0</span><span class="Delimiter">;</span> j &lt; SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span> ++j<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-        if <span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
-        if <span class="Delimiter">(</span>Type<span class="Delimiter">.</span>find<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>at<span class="Delimiter">(</span>j<span class="Delimiter">))</span> == Type<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
-          raise &lt;&lt; <span class="Constant">&quot;unknown type for field &quot;</span> &lt;&lt; info<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot; in &quot;</span> &lt;&lt; info<span class="Delimiter">.</span>name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
-      <span class="Delimiter">}</span>
+    <span class="Comment">// Check Container Field Types(info)</span>
+    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
+      check_invalid_types<span class="Delimiter">(</span>info<span class="Delimiter">.</span>elements<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> maybe<span class="Delimiter">(</span>info<span class="Delimiter">.</span>name<span class="Delimiter">),</span> info<span class="Delimiter">.</span>element_names<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+  <span class="Delimiter">}</span>
+<span class="Delimiter">}</span>
+
+void check_invalid_types<span class="Delimiter">(</span>const recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  for <span class="Delimiter">(</span>long long int index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    const instruction&amp; inst = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
+    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      check_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span>
+                          maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">),</span> <span class="Constant">&quot;'&quot;</span>+inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
+    <span class="Delimiter">}</span>
+    for <span class="Delimiter">(</span>long long int i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      check_invalid_types<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span>
+                          maybe<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>name<span class="Delimiter">),</span> <span class="Constant">&quot;'&quot;</span>+inst<span class="Delimiter">.</span>to_string<span class="Delimiter">()</span>+<span class="Constant">&quot;'&quot;</span><span class="Delimiter">);</span>
     <span class="Delimiter">}</span>
   <span class="Delimiter">}</span>
 <span class="Delimiter">}</span>
 
+void check_invalid_types<span class="Delimiter">(</span>type_tree* type<span class="Delimiter">,</span> const string&amp; block<span class="Delimiter">,</span> const string&amp; name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  if <span class="Delimiter">(</span>!type<span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>  <span class="Comment">// will throw a more precise error elsewhere</span>
+  <span class="Comment">// End Container Type Checks</span>
+  if <span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>value == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+    assert<span class="Delimiter">(</span>!type<span class="Delimiter">-&gt;</span>left &amp;&amp; !type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
+    <span class="Identifier">return</span><span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  if <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Type<span class="Delimiter">,</span> type<span class="Delimiter">-&gt;</span>value<span class="Delimiter">))</span>
+    raise_error &lt;&lt; block &lt;&lt; <span class="Constant">&quot;unknown type in &quot;</span> &lt;&lt; name &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
+  check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
+  check_invalid_types<span class="Delimiter">(</span>type<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> block<span class="Delimiter">,</span> name<span class="Delimiter">);</span>
+<span class="Delimiter">}</span>
+
 <span class="SalientComment">//:: Construct types out of their constituent fields. Doesn't currently do</span>
 <span class="SalientComment">//:: type-checking but *does* match sizes.</span>
 <span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
 MERGE<span class="Delimiter">,</span>
 <span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
-Recipe_ordinal[<span class="Constant">&quot;merge&quot;</span>] = MERGE<span class="Delimiter">;</span>
+put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">&quot;merge&quot;</span><span class="Delimiter">,</span> MERGE<span class="Delimiter">);</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Checks&quot;)</span>
+case MERGE: <span class="Delimiter">{</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
 <span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
 case MERGE: <span class="Delimiter">{</span>
   products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
@@ -533,15 +675,6 @@ recipe main [
 ]
 <span class="traceContains">+mem: storing 3 in location 1</span>
 <span class="traceContains">+mem: storing 4 in location 2</span>
-
-<span class="SalientComment">//:: helpers</span>
-
-<span class="Delimiter">:(code)</span>
-void skip_bracket<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> string message<span class="Delimiter">)</span> <span class="Delimiter">{</span>
-  skip_whitespace_and_comments<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
-  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">()</span> != <span class="Constant">'['</span><span class="Delimiter">)</span>
-    raise &lt;&lt; message &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
-<span class="Delimiter">}</span>
 </pre>
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