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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<pre>
<span class="Comment">//: Transform to maintain multiple variants of a recipe depending on the</span>
<span class="Comment">//: number and types of the ingredients and products. Allows us to use nice</span>
<span class="Comment">//: names like 'print' or 'length' in many mutually extensible ways.</span>

<span class="Delimiter">:(scenario static_dispatch)</span>
def main [
  <span class="Constant">7</span>:number/<span class="Special">raw &lt;- </span>test <span class="Constant">3</span>
]
def test a:number <span class="Delimiter">-&gt;</span> z:number [
  z<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
def test a:number<span class="Delimiter">,</span> b:number <span class="Delimiter">-&gt;</span> z:number [
  z<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>
]
<span class="traceContains">+mem: storing 1 in location 7</span>

<span class="Comment">//: When loading recipes, accumulate variants if headers don't collide, and</span>
<span class="Comment">//: flag an error if headers collide.</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
map&lt;string<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt; &gt; Recipe_variants<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
put<span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> <span class="Constant">&quot;main&quot;</span><span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;<span class="Delimiter">());</span>  <span class="Comment">// since we manually added main to Recipe_ordinal</span>
<span class="Delimiter">:(before &quot;Clear Other State For Recently_added_recipes&quot;)</span>
<span class="Normal">for</span> <span class="Delimiter">(</span>map&lt;string<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt; &gt;::iterator p = Recipe_variants<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != Recipe_variants<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>find<span class="Delimiter">(</span>Recently_added_recipes<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> Recently_added_recipes<span class="Delimiter">.</span>end<span class="Delimiter">(),</span> p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> != Recently_added_recipes<span class="Delimiter">.</span>end<span class="Delimiter">())</span>
      p<span class="Delimiter">-&gt;</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> = -<span class="Constant">1</span><span class="Delimiter">;</span>  <span class="Comment">// just leave a ghost</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Load Recipe Header(result)&quot;)</span>
<span class="Comment">// there can only ever be one variant for main</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>result<span class="Delimiter">.</span>name != <span class="Constant">&quot;main&quot;</span> &amp;&amp; contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">))</span> <span class="Delimiter">{</span>
  <span class="Normal">const</span> recipe_ordinal r = get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">)</span> || get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">).</span>has_header<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    string new_name = matching_variant_name<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>new_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
      <span class="Comment">// variant doesn't already exist</span>
      new_name = next_unused_recipe_name<span class="Delimiter">(</span>result<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
      put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> new_name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
      get_or_insert<span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> new_name<span class="Delimiter">));</span>
    <span class="Delimiter">}</span>
    trace<span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">&quot;load&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;switching &quot;</span> &lt;&lt; result<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot; to &quot;</span> &lt;&lt; new_name &lt;&lt; end<span class="Delimiter">();</span>
    result<span class="Delimiter">.</span>name = new_name<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>
<span class="Normal">else</span> <span class="Delimiter">{</span>
  <span class="Comment">// save first variant</span>
  put<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">,</span> Next_recipe_ordinal++<span class="Delimiter">);</span>
  get_or_insert<span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">).</span>push_back<span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> result<span class="Delimiter">.</span>name<span class="Delimiter">));</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
string matching_variant_name<span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; rr<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">const</span> vector&lt;recipe_ordinal&gt;&amp; variants = get_or_insert<span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> rr<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>variants<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!all_reagents_match<span class="Delimiter">(</span>rr<span class="Delimiter">,</span> candidate<span class="Delimiter">))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Identifier">return</span> candidate<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">bool</span> all_reagents_match<span class="Delimiter">(</span><span class="Normal">const</span> recipe&amp; r1<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; r2<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span> != SIZE<span class="Delimiter">(</span>r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">)</span> != SIZE<span class="Delimiter">(</span>r2<span class="Delimiter">.</span>products<span class="Delimiter">))</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> r2<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!deeply_equal_type_names<span class="Delimiter">(</span>r1<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> r2<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
set&lt;string&gt; Literal_type_names<span class="Delimiter">;</span>
<span class="Delimiter">:(before &quot;End One-time Setup&quot;)</span>
Literal_type_names<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;number&quot;</span><span class="Delimiter">);</span>
Literal_type_names<span class="Delimiter">.</span>insert<span class="Delimiter">(</span><span class="Constant">&quot;character&quot;</span><span class="Delimiter">);</span>
<span class="Delimiter">:(code)</span>
<span class="Normal">bool</span> deeply_equal_type_names<span class="Delimiter">(</span><span class="Normal">const</span> reagent&amp; a<span class="Delimiter">,</span> <span class="Normal">const</span> reagent&amp; b<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> deeply_equal_type_names<span class="Delimiter">(</span>a<span class="Delimiter">.</span>type<span class="Delimiter">,</span> b<span class="Delimiter">.</span>type<span class="Delimiter">);</span>
<span class="Delimiter">}</span>
<span class="Normal">bool</span> deeply_equal_type_names<span class="Delimiter">(</span><span class="Normal">const</span> type_tree* a<span class="Delimiter">,</span> <span class="Normal">const</span> type_tree* b<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!a<span class="Delimiter">)</span> <span class="Identifier">return</span> !b<span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!b<span class="Delimiter">)</span> <span class="Identifier">return</span> !a<span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span> &amp;&amp; b<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
    <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
    <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>b<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span>end<span class="Delimiter">();</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>b<span class="Delimiter">-&gt;</span>name == <span class="Constant">&quot;literal&quot;</span><span class="Delimiter">)</span>
    <span class="Identifier">return</span> Literal_type_names<span class="Delimiter">.</span>find<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>name<span class="Delimiter">)</span> != Literal_type_names<span class="Delimiter">.</span>end<span class="Delimiter">();</span>
  <span class="Identifier">return</span> a<span class="Delimiter">-&gt;</span>name == b<span class="Delimiter">-&gt;</span>name
      &amp;&amp; deeply_equal_type_names<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>left<span class="Delimiter">,</span> b<span class="Delimiter">-&gt;</span>left<span class="Delimiter">)</span>
      &amp;&amp; deeply_equal_type_names<span class="Delimiter">(</span>a<span class="Delimiter">-&gt;</span>right<span class="Delimiter">,</span> b<span class="Delimiter">-&gt;</span>right<span class="Delimiter">);</span>
<span class="Delimiter">}</span>

string next_unused_recipe_name<span class="Delimiter">(</span><span class="Normal">const</span> string&amp; recipe_name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">2</span><span class="Delimiter">;</span> <span class="Delimiter">;</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    ostringstream out<span class="Delimiter">;</span>
    out &lt;&lt; recipe_name &lt;&lt; <span class="Constant">'_'</span> &lt;&lt; i<span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!contains_key<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> out<span class="Delimiter">.</span>str<span class="Delimiter">()))</span>
      <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Once all the recipes are loaded, transform their bodies to replace each</span>
<span class="Comment">//: call with the most suitable variant.</span>

<span class="Delimiter">:(scenario static_dispatch_picks_most_similar_variant)</span>
def main [
  <span class="Constant">7</span>:number/<span class="Special">raw &lt;- </span>test <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">,</span> <span class="Constant">5</span>
]
def test a:number <span class="Delimiter">-&gt;</span> z:number [
  z<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
def test a:number<span class="Delimiter">,</span> b:number <span class="Delimiter">-&gt;</span> z:number [
  z<span class="Special"> &lt;- </span>copy <span class="Constant">2</span>
]
<span class="traceContains">+mem: storing 2 in location 7</span>

<span class="Comment">//: support recipe headers in a previous transform to fill in missing types</span>
<span class="Delimiter">:(before &quot;End check_or_set_invalid_types&quot;)</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
  check_or_set_invalid_types<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">),</span> <span class="Constant">&quot;recipe header ingredient&quot;</span><span class="Delimiter">);</span>
<span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
  check_or_set_invalid_types<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>type<span class="Delimiter">,</span> maybe<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">),</span> <span class="Constant">&quot;recipe header product&quot;</span><span class="Delimiter">);</span>

<span class="Comment">//: after filling in all missing types (because we'll be introducing 'blank' types in this transform in a later layer, for shape-shifting recipes)</span>
<span class="Delimiter">:(after &quot;Transform.push_back(transform_names)&quot;)</span>
Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>resolve_ambiguous_calls<span class="Delimiter">);</span>  <span class="Comment">// idempotent</span>

<span class="Comment">//: In a later layer we'll introduce recursion in resolve_ambiguous_calls, by</span>
<span class="Comment">//: having it generate code for shape-shifting recipes and then transform such</span>
<span class="Comment">//: code. This data structure will help error messages be more useful.</span>
<span class="Comment">//:</span>
<span class="Comment">//: We're punning the 'call' data structure just because it has slots for</span>
<span class="Comment">//: calling recipe and calling instruction.</span>
<span class="Delimiter">:(before &quot;End Globals&quot;)</span>
list&lt;call&gt; resolve_stack<span class="Delimiter">;</span>

<span class="Delimiter">:(code)</span>
<span class="Normal">void</span> resolve_ambiguous_calls<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  recipe&amp; caller_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
  trace<span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;--- resolve ambiguous calls for recipe &quot;</span> &lt;&lt; caller_recipe<span class="Delimiter">.</span>name &lt;&lt; end<span class="Delimiter">();</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> index = <span class="Constant">0</span><span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    instruction&amp; inst = caller_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>non_ghost_size<span class="Delimiter">(</span>get_or_insert<span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">))</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;instruction &quot;</span> &lt;&lt; inst<span class="Delimiter">.</span>original_string &lt;&lt; end<span class="Delimiter">();</span>
    resolve_stack<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<span class="Delimiter">(</span>r<span class="Delimiter">));</span>
    resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index = index<span class="Delimiter">;</span>
    string new_name = best_variant<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> caller_recipe<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!new_name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span>
      inst<span class="Delimiter">.</span>name = new_name<span class="Delimiter">;</span>
    assert<span class="Delimiter">(</span>resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_recipe == r<span class="Delimiter">);</span>
    assert<span class="Delimiter">(</span>resolve_stack<span class="Delimiter">.</span>front<span class="Delimiter">().</span>running_step_index == index<span class="Delimiter">);</span>
    resolve_stack<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

string best_variant<span class="Delimiter">(</span>instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; caller_recipe<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  vector&lt;recipe_ordinal&gt;&amp; variants = get<span class="Delimiter">(</span>Recipe_variants<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">);</span>
  vector&lt;recipe_ordinal&gt; candidates<span class="Delimiter">;</span>

  <span class="Comment">// Static Dispatch Phase 1</span>
  candidates = strictly_matching_variants<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> variants<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!candidates<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> best_variant<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> candidates<span class="Delimiter">).</span>name<span class="Delimiter">;</span>

  <span class="Comment">// Static Dispatch Phase 2 (shape-shifting recipes in a later layer)</span>
  <span class="Comment">// End Static Dispatch Phase 2</span>

  <span class="Comment">// Static Dispatch Phase 3</span>
  candidates = strictly_matching_variants_except_literal_against_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> variants<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!candidates<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> best_variant<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> candidates<span class="Delimiter">).</span>name<span class="Delimiter">;</span>

  <span class="Comment">// Static Dispatch Phase 4</span>
  candidates = matching_variants<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> variants<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!candidates<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> best_variant<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> candidates<span class="Delimiter">).</span>name<span class="Delimiter">;</span>

  <span class="Comment">// error messages</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>get<span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> inst<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &gt;= MAX_PRIMITIVE_RECIPES<span class="Delimiter">)</span> <span class="Delimiter">{</span>  <span class="Comment">// we currently don't check types for primitive variants</span>
    raise &lt;&lt; maybe<span class="Delimiter">(</span>caller_recipe<span class="Delimiter">.</span>name<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;failed to find a matching call for '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;'</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Normal">for</span> <span class="Delimiter">(</span>list&lt;call&gt;::iterator p = <span class="Comment">/*</span><span class="Comment">skip</span><span class="Comment">*/</span>++resolve_stack<span class="Delimiter">.</span>begin<span class="Delimiter">();</span> p != resolve_stack<span class="Delimiter">.</span>end<span class="Delimiter">();</span> ++p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Normal">const</span> recipe&amp; specializer_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> p<span class="Delimiter">-&gt;</span>running_recipe<span class="Delimiter">);</span>
      <span class="Normal">const</span> instruction&amp; specializer_inst = specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>p<span class="Delimiter">-&gt;</span>running_step_index<span class="Delimiter">);</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>name != <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>
        raise &lt;&lt; <span class="Constant">&quot;  (from '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>specializer_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;' in &quot;</span> &lt;&lt; specializer_recipe<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Normal">else</span>
        raise &lt;&lt; <span class="Constant">&quot;  (from '&quot;</span> &lt;&lt; to_string<span class="Delimiter">(</span>specializer_inst<span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Comment">// One special-case to help with the rewrite_stash transform. (cross-layer)</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>name<span class="Delimiter">.</span>find<span class="Delimiter">(</span><span class="Constant">&quot;stash_&quot;</span><span class="Delimiter">)</span> == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
        instruction stash_inst<span class="Delimiter">;</span>
        <span class="Normal">if</span> <span class="Delimiter">(</span>next_stash<span class="Delimiter">(</span>*p<span class="Delimiter">,</span> &amp;stash_inst<span class="Delimiter">))</span> <span class="Delimiter">{</span>
          <span class="Normal">if</span> <span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>name != <span class="Constant">&quot;interactive&quot;</span><span class="Delimiter">)</span>
            raise &lt;&lt; <span class="Constant">&quot;  (part of '&quot;</span> &lt;&lt; stash_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;' in &quot;</span> &lt;&lt; specializer_recipe<span class="Delimiter">.</span>name &lt;&lt; <span class="Constant">&quot;)</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
          <span class="Normal">else</span>
            raise &lt;&lt; <span class="Constant">&quot;  (part of '&quot;</span> &lt;&lt; stash_inst<span class="Delimiter">.</span>original_string &lt;&lt; <span class="Constant">&quot;')</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
        <span class="Delimiter">}</span>
      <span class="Delimiter">}</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">&quot;&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// phase 1</span>
vector&lt;recipe_ordinal&gt; strictly_matching_variants<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>variants<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>all_header_reagents_strictly_match<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">bool</span> all_header_reagents_strictly_match<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: product &quot;</span> &lt;&lt; i &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// phase 3</span>
vector&lt;recipe_ordinal&gt; strictly_matching_variants_except_literal_against_boolean<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>variants<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant (strict except literals-against-booleans) &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>all_header_reagents_strictly_match_except_literal_against_boolean<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">bool</span> all_header_reagents_strictly_match_except_literal_against_boolean<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_against_boolean<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_strictly_match_except_literal_against_boolean<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: product &quot;</span> &lt;&lt; i &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// phase 4</span>
vector&lt;recipe_ordinal&gt; matching_variants<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  vector&lt;recipe_ordinal&gt; result<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>variants<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> == -<span class="Constant">1</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    trace<span class="Delimiter">(</span><span class="Constant">9992</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;checking variant &quot;</span> &lt;&lt; i &lt;&lt; <span class="Constant">&quot;: &quot;</span> &lt;&lt; header_label<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>all_header_reagents_match<span class="Delimiter">(</span>inst<span class="Delimiter">,</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))))</span>
      result<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">bool</span> all_header_reagents_match<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> <span class="Normal">const</span> recipe&amp; variant<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: ingredient &quot;</span> &lt;&lt; i &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; min<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">),</span> SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">));</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>is_dummy<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>!types_match<span class="Delimiter">(</span>variant<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> inst<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
      trace<span class="Delimiter">(</span><span class="Constant">9993</span><span class="Delimiter">,</span> <span class="Constant">&quot;transform&quot;</span><span class="Delimiter">)</span> &lt;&lt; <span class="Constant">&quot;strict match failed: product &quot;</span> &lt;&lt; i &lt;&lt; end<span class="Delimiter">();</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// tie-breaker for each phase</span>
<span class="Normal">const</span> recipe&amp; best_variant<span class="Delimiter">(</span><span class="Normal">const</span> instruction&amp; inst<span class="Delimiter">,</span> vector&lt;recipe_ordinal&gt;&amp; candidates<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>!candidates<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> min_score = <span class="Constant">999</span><span class="Delimiter">;</span>
  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> min_index = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>candidates<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">const</span> recipe&amp; candidate = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
    <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> score = abs<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>products<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>products<span class="Delimiter">))</span>
                          + abs<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>candidate<span class="Delimiter">.</span>ingredients<span class="Delimiter">)</span>-SIZE<span class="Delimiter">(</span>inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">));</span>
    assert<span class="Delimiter">(</span>score &lt; <span class="Constant">999</span><span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>score &lt; min_score<span class="Delimiter">)</span> <span class="Delimiter">{</span>
      min_score = score<span class="Delimiter">;</span>
      min_index = i<span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> candidates<span class="Delimiter">.</span>at<span class="Delimiter">(</span>min_index<span class="Delimiter">));</span>
<span class="Delimiter">}</span>

<span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> non_ghost_size<span class="Delimiter">(</span>vector&lt;recipe_ordinal&gt;&amp; variants<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> result = <span class="Constant">0</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>variants<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>variants<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">)</span> != -<span class="Constant">1</span><span class="Delimiter">)</span> ++result<span class="Delimiter">;</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Normal">bool</span> next_stash<span class="Delimiter">(</span><span class="Normal">const</span> call&amp; c<span class="Delimiter">,</span> instruction* stash_inst<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">const</span> recipe&amp; specializer_recipe = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> c<span class="Delimiter">.</span>running_recipe<span class="Delimiter">);</span>
  <span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> index = c<span class="Delimiter">.</span>running_step_index<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span>++index<span class="Delimiter">;</span> index &lt; SIZE<span class="Delimiter">(</span>specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++index<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">const</span> instruction&amp; inst = specializer_recipe<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>index<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>inst<span class="Delimiter">.</span>name == <span class="Constant">&quot;stash&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      *stash_inst = inst<span class="Delimiter">;</span>
      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario static_dispatch_disabled_in_recipe_without_variants)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>test <span class="Constant">3</span>
]
def test [
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># ensure no header</span>
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(scenario static_dispatch_disabled_on_headerless_definition)</span>
<span class="Special">% Hide_errors = true;</span>
def test a:number <span class="Delimiter">-&gt;</span> z:number [
  z<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
def test [
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
<span class="traceContains">+error: redefining recipe test</span>

<span class="Delimiter">:(scenario static_dispatch_disabled_on_headerless_definition_2)</span>
<span class="Special">% Hide_errors = true;</span>
def test [
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def test a:number <span class="Delimiter">-&gt;</span> z:number [
  z<span class="Special"> &lt;- </span>copy <span class="Constant">1</span>
]
<span class="traceContains">+error: redefining recipe test</span>

<span class="Delimiter">:(scenario static_dispatch_on_primitive_names)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Constant">3</span>:boolean<span class="Special"> &lt;- </span>equal <span class="Constant">1</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:number
  <span class="Constant">4</span>:boolean<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>/<span class="Constant">false</span>
  <span class="Constant">5</span>:boolean<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>/<span class="Constant">false</span>
  <span class="Constant">6</span>:boolean<span class="Special"> &lt;- </span>equal <span class="Constant">4</span>:boolean<span class="Delimiter">,</span> <span class="Constant">5</span>:boolean
]

<span class="Comment"># temporarily hardcode number equality to always fail</span>
def equal x:number<span class="Delimiter">,</span> y:number <span class="Delimiter">-&gt;</span> z:boolean [
  local-scope
  load-ingredients
  z<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>/<span class="Constant">false</span>
]
<span class="Comment"># comparing numbers used overload</span>
<span class="traceContains">+mem: storing 0 in location 3</span>
<span class="Comment"># comparing booleans continues to use primitive</span>
<span class="traceContains">+mem: storing 1 in location 6</span>

<span class="Delimiter">:(scenario static_dispatch_works_with_dummy_results_for_containers)</span>
def main [
  _<span class="Special"> &lt;- </span>test <span class="Constant">3</span><span class="Delimiter">,</span> <span class="Constant">4</span>
]
def test a:number <span class="Delimiter">-&gt;</span> z:point [
  local-scope
  load-ingredients
  z<span class="Special"> &lt;- </span>merge a<span class="Delimiter">,</span> <span class="Constant">0</span>
]
def test a:number<span class="Delimiter">,</span> b:number <span class="Delimiter">-&gt;</span> z:point [
  local-scope
  load-ingredients
  z<span class="Special"> &lt;- </span>merge a<span class="Delimiter">,</span> b
]
$error: <span class="Constant">0</span>

<span class="Delimiter">:(scenario static_dispatch_works_with_compound_type_containing_container_defined_after_first_use)</span>
def main [
  x:address:shared:foo<span class="Special"> &lt;- </span><span class="Normal">new</span> foo:type
  test x
]
container foo [
  x:number
]
def test a:address:shared:foo <span class="Delimiter">-&gt;</span> z:number [
  local-scope
  load-ingredients
  z:number<span class="Special"> &lt;- </span>get *a<span class="Delimiter">,</span> x:offset
]
$error: <span class="Constant">0</span>

<span class="Delimiter">:(scenario static_dispatch_works_with_compound_type_containing_container_defined_after_second_use)</span>
def main [
  x:address:shared:foo<span class="Special"> &lt;- </span><span class="Normal">new</span> foo:type
  test x
]
def test a:address:shared:foo <span class="Delimiter">-&gt;</span> z:number [
  local-scope
  load-ingredients
  z:number<span class="Special"> &lt;- </span>get *a<span class="Delimiter">,</span> x:offset
]
container foo [
  x:number
]
$error: <span class="Constant">0</span>

<span class="Delimiter">:(scenario static_dispatch_prefers_literals_to_be_numbers_rather_than_addresses)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>foo <span class="Constant">0</span>
]
def foo x:address:number <span class="Delimiter">-&gt;</span> y:number [
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def foo x:number <span class="Delimiter">-&gt;</span> y:number [
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="traceContains">+mem: storing 35 in location 1</span>

<span class="Delimiter">:(scenario static_dispatch_on_non_literal_character_ignores_variant_with_numbers)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
  local-scope
  x:character<span class="Special"> &lt;- </span>copy <span class="Constant">10</span>/newline
  <span class="Constant">1</span>:number/<span class="Special">raw &lt;- </span>foo x
]
def foo x:number <span class="Delimiter">-&gt;</span> y:number [
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
<span class="traceContains">+error: main: ingredient 0 has the wrong type at '1:number/raw &lt;- foo x'</span>
<span class="traceAbsent">-mem: storing 34 in location 1</span>

<span class="Delimiter">:(scenario static_dispatch_dispatches_literal_to_boolean_before_character)</span>
def main [
  <span class="Constant">1</span>:number/<span class="Special">raw &lt;- </span>foo <span class="Constant">0</span>  <span class="Comment"># valid literal for boolean</span>
]
def foo x:character <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def foo x:boolean <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="Comment"># boolean variant is preferred</span>
<span class="traceContains">+mem: storing 35 in location 1</span>

<span class="Delimiter">:(scenario static_dispatch_dispatches_literal_to_character_when_out_of_boolean_range)</span>
def main [
  <span class="Constant">1</span>:number/<span class="Special">raw &lt;- </span>foo <span class="Constant">97</span>  <span class="Comment"># not a valid literal for boolean</span>
]
def foo x:character <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def foo x:boolean <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="Comment"># character variant is preferred</span>
<span class="traceContains">+mem: storing 34 in location 1</span>

<span class="Delimiter">:(scenario static_dispatch_dispatches_literal_to_number_if_at_all_possible)</span>
def main [
  <span class="Constant">1</span>:number/<span class="Special">raw &lt;- </span>foo <span class="Constant">97</span>
]
def foo x:character <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def foo x:number <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="Comment"># number variant is preferred</span>
<span class="traceContains">+mem: storing 35 in location 1</span>

<span class="Delimiter">:(code)</span>
string header_label<span class="Delimiter">(</span>recipe_ordinal r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">const</span> recipe&amp; caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
  ostringstream out<span class="Delimiter">;</span>
  out &lt;&lt; <span class="Constant">&quot;recipe &quot;</span> &lt;&lt; caller<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
    out &lt;&lt; <span class="Constant">' '</span> &lt;&lt; to_string<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>!caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> out &lt;&lt; <span class="Constant">&quot; -&gt;&quot;</span><span class="Delimiter">;</span>
  <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">long</span> <span class="Normal">long</span> <span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i &lt; SIZE<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
    out &lt;&lt; <span class="Constant">' '</span> &lt;&lt; to_string<span class="Delimiter">(</span>caller<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario reload_variant_retains_other_variants)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>foo <span class="Constant">1</span>:number
]
def foo x:number <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def foo x:address:number <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
def! foo x:address:number <span class="Delimiter">-&gt;</span> y:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">36</span>
]
<span class="traceContains">+mem: storing 34 in location 2</span>
$error: <span class="Constant">0</span>

<span class="Delimiter">:(scenario dispatch_errors_come_after_unknown_name_errors)</span>
<span class="Special">% Hide_errors = true;</span>
def main [
  y:number<span class="Special"> &lt;- </span>foo x
]
def foo a:number <span class="Delimiter">-&gt;</span> b:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">34</span>
]
def foo a:boolean <span class="Delimiter">-&gt;</span> b:number [
  local-scope
  load-ingredients
  <span class="Identifier">return</span> <span class="Constant">35</span>
]
<span class="traceContains">+error: main: missing type for x in 'y:number &lt;- foo x'</span>
<span class="traceContains">+error: main: failed to find a matching call for 'y:number &lt;- foo x'</span>

<span class="Delimiter">:(before &quot;End Includes&quot;)</span>
<span class="Normal">using</span> std::abs<span class="Delimiter">;</span>
</pre>
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