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+<span class="Comment">//: Calls can take ingredients just like primitives. To access a recipe's</span>
+<span class="Comment">//: ingredients, use 'next-ingredient'.</span>
+
+<span class="Delimiter">:(scenario next_ingredient)</span>
+recipe main [
+  f <span class="Constant">2</span>:literal
+]
+recipe f [
+  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>next-ingredient
+  <span class="Constant">13</span>:number<span class="Special"> &lt;- </span>add <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">12</span>:number
+]
+<span class="traceContains">+mem: storing 3 in location 13</span>
+
+<span class="Delimiter">:(scenario next_ingredient_missing)</span>
+recipe main [
+  f
+]
+recipe f [
+  _<span class="Delimiter">,</span> <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>next-ingredient
+]
+<span class="traceContains">+mem: storing 0 in location 12</span>
+
+<span class="Delimiter">:(before &quot;End call Fields&quot;)</span>
+vector&lt;vector&lt;double&gt; &gt; ingredient_atoms<span class="Delimiter">;</span>
+long long int next_ingredient_to_process<span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End call Constructor&quot;)</span>
+next_ingredient_to_process = <span class="Constant">0</span><span class="Delimiter">;</span>
+
+<span class="Delimiter">:(after &quot;complete_call:&quot;)</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>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+NEXT_INGREDIENT<span class="Delimiter">,</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+Recipe_ordinal[<span class="Constant">&quot;next-ingredient&quot;</span>] = NEXT_INGREDIENT<span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+case NEXT_INGREDIENT: <span class="Delimiter">{</span>
+  assert<span class="Delimiter">(</span>!Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
+  if <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process &lt; SIZE<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
+        Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
+    assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
+    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+    ++Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  else <span class="Delimiter">{</span>
+    products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</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><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// todo: will fail noisily if we try to read a compound value</span>
+    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+  <span class="Delimiter">}</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(scenario rewind_ingredients)</span>
+recipe main [
+  f <span class="Constant">2</span>:literal
+]
+recipe f [
+  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># consume ingredient</span>
+  _<span class="Delimiter">,</span> <span class="Constant">1</span>:boolean<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># will not find any ingredients</span>
+  rewind-ingredients
+  <span class="Constant">13</span>:number<span class="Delimiter">,</span> <span class="Constant">2</span>:boolean<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># will find ingredient again</span>
+]
+<span class="traceContains">+mem: storing 2 in location 12</span>
+<span class="traceContains">+mem: storing 0 in location 1</span>
+<span class="traceContains">+mem: storing 2 in location 13</span>
+<span class="traceContains">+mem: storing 1 in location 2</span>
+
+<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+REWIND_INGREDIENTS<span class="Delimiter">,</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+Recipe_ordinal[<span class="Constant">&quot;rewind-ingredients&quot;</span>] = REWIND_INGREDIENTS<span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+case REWIND_INGREDIENTS: <span class="Delimiter">{</span>
+  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process = <span class="Constant">0</span><span class="Delimiter">;</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(scenario ingredient)</span>
+recipe main [
+  f <span class="Constant">1</span>:literal<span class="Delimiter">,</span> <span class="Constant">2</span>:literal
+]
+recipe f [
+  <span class="Constant">12</span>:number<span class="Special"> &lt;- </span>ingredient <span class="Constant">1</span>:literal  <span class="Comment"># consume second ingredient first</span>
+  <span class="Constant">13</span>:number<span class="Delimiter">,</span> <span class="Constant">1</span>:boolean<span class="Special"> &lt;- </span>next-ingredient  <span class="Comment"># next-ingredient tries to scan past that</span>
+]
+<span class="traceContains">+mem: storing 2 in location 12</span>
+<span class="traceContains">+mem: storing 0 in location 1</span>
+
+<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+INGREDIENT<span class="Delimiter">,</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+Recipe_ordinal[<span class="Constant">&quot;ingredient&quot;</span>] = INGREDIENT<span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+case INGREDIENT: <span class="Delimiter">{</span>
+  assert<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">0</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">0</span><span class="Delimiter">)));</span>
+  if <span class="Delimiter">(</span>static_cast&lt;long long int&gt;<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">))</span> &lt; SIZE<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">))</span> <span class="Delimiter">{</span>
+    Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process = ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+    products<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>
+        Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>ingredient_atoms<span class="Delimiter">.</span>at<span class="Delimiter">(</span>Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">));</span>
+    assert<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>products<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">);</span>  products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</span><span class="Delimiter">);</span>  <span class="Comment">// push a new vector</span>
+    products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
+    ++Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>front<span class="Delimiter">().</span>next_ingredient_to_process<span class="Delimiter">;</span>
+  <span class="Delimiter">}</span>
+  else <span class="Delimiter">{</span>
+    if <span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>products<span class="Delimiter">)</span> &gt; <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+      products<span class="Delimiter">.</span>resize<span class="Delimiter">(</span><span class="Constant">2</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><span class="Constant">0</span><span class="Delimiter">);</span>  <span class="Comment">// todo: will fail noisily if we try to read a compound value</span>
+      products<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">).</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
+    <span class="Delimiter">}</span>
+  <span class="Delimiter">}</span>
+  <span class="Identifier">break</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+</pre>
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