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+<pre id='vimCodeElement'>
+<span class="Comment">//: So far we've been calling a fixed recipe in each instruction, but we'd</span>
+<span class="Comment">//: also like to make the recipe a variable, pass recipes to &quot;higher-order&quot;</span>
+<span class="Comment">//: recipes, return recipes from recipes and so on.</span>
+
+<span class="Delimiter">:(scenario call_literal_recipe)</span>
+recipe main [
+  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>call f:recipe<span class="Delimiter">,</span> <span class="Constant">34</span>:literal
+]
+recipe f [
+  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>next-ingredient
+  reply <span class="Constant">2</span>:number
+]
+<span class="traceContains">+mem: storing 34 in location 1</span>
+
+<span class="Delimiter">:(scenario call_variable)</span>
+recipe main [
+  <span class="Constant">1</span>:recipe-ordinal<span class="Special"> &lt;- </span>copy f:recipe
+  <span class="Constant">2</span>:number<span class="Special"> &lt;- </span>call <span class="Constant">1</span>:recipe-ordinal<span class="Delimiter">,</span> <span class="Constant">34</span>:literal
+]
+recipe f [
+  <span class="Constant">3</span>:number<span class="Special"> &lt;- </span>next-ingredient
+  reply <span class="Constant">3</span>:number
+]
+<span class="traceContains">+mem: storing 34 in location 2</span>
+<span class="CommentedCode">#? ?</span>
+
+<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
+<span class="Comment">// 'recipe' is a literal</span>
+Type_ordinal[<span class="Constant">&quot;recipe&quot;</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>
+<span class="Comment">// 'recipe-ordinal' is the literal that can store recipe literals</span>
+type_ordinal recipe_ordinal = Type_ordinal[<span class="Constant">&quot;recipe-ordinal&quot;</span>] = Next_type_ordinal++<span class="Delimiter">;</span>
+Type[recipe_ordinal]<span class="Delimiter">.</span>name = <span class="Constant">&quot;recipe-ordinal&quot;</span><span class="Delimiter">;</span>
+
+<span class="Delimiter">:(before &quot;End Reagent-parsing Exceptions&quot;)</span>
+if <span class="Delimiter">(</span>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><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">&quot;recipe&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
+  r<span class="Delimiter">.</span>set_value<span class="Delimiter">(</span>Recipe_ordinal[r<span class="Delimiter">.</span>name]<span class="Delimiter">);</span>
+  <span class="Identifier">return</span><span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+
+<span class="Delimiter">:(before &quot;End Primitive Recipe Declarations&quot;)</span>
+CALL<span class="Delimiter">,</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Numbers&quot;)</span>
+Recipe_ordinal[<span class="Constant">&quot;call&quot;</span>] = CALL<span class="Delimiter">;</span>
+<span class="Delimiter">:(before &quot;End Primitive Recipe Implementations&quot;)</span>
+case CALL: <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>
+  <span class="Comment">// todo: when we start doing type checking this will be a prime point of</span>
+  <span class="Comment">// attention, so we don't accidentally allow external data to a program to</span>
+  <span class="Comment">// run as code.</span>
+  Current_routine<span class="Delimiter">-&gt;</span>calls<span class="Delimiter">.</span>push_front<span class="Delimiter">(</span>call<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>
+  ingredients<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">());</span>  <span class="Comment">// drop the callee</span>
+  <span class="Identifier">goto</span> complete_call<span class="Delimiter">;</span>
+<span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->