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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">//: Calls can also generate products, using 'reply' or 'return'.</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(scenario return)</span>
<span id="L4" class="LineNr"> 4 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L5" class="LineNr"> 5 </span> <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">2</span>:num<span class="Special"> <- </span>f <span class="Constant">34</span>
<span id="L6" class="LineNr"> 6 </span>]
<span id="L7" class="LineNr"> 7 </span><span class="muRecipe">def</span> f [
<span id="L8" class="LineNr"> 8 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>next-ingredient
<span id="L9" class="LineNr"> 9 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>add <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">12</span>:num
<span id="L10" class="LineNr"> 10 </span> <span class="Identifier">return</span> <span class="Constant">12</span>:num<span class="Delimiter">,</span> <span class="Constant">13</span>:num
<span id="L11" class="LineNr"> 11 </span>]
<span id="L12" class="LineNr"> 12 </span><span class="traceContains">+mem: storing 34 in location 1</span>
<span id="L13" class="LineNr"> 13 </span><span class="traceContains">+mem: storing 35 in location 2</span>
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="Delimiter">:(scenario reply)</span>
<span id="L16" class="LineNr"> 16 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L17" class="LineNr"> 17 </span> <span class="Constant">1</span>:num<span class="Delimiter">,</span> <span class="Constant">2</span>:num<span class="Special"> <- </span>f <span class="Constant">34</span>
<span id="L18" class="LineNr"> 18 </span>]
<span id="L19" class="LineNr"> 19 </span><span class="muRecipe">def</span> f [
<span id="L20" class="LineNr"> 20 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>next-ingredient
<span id="L21" class="LineNr"> 21 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>add <span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">12</span>:num
<span id="L22" class="LineNr"> 22 </span> reply <span class="Constant">12</span>:num<span class="Delimiter">,</span> <span class="Constant">13</span>:num
<span id="L23" class="LineNr"> 23 </span>]
<span id="L24" class="LineNr"> 24 </span><span class="traceContains">+mem: storing 34 in location 1</span>
<span id="L25" class="LineNr"> 25 </span><span class="traceContains">+mem: storing 35 in location 2</span>
<span id="L26" class="LineNr"> 26 </span>
<span id="L27" class="LineNr"> 27 </span><span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
<span id="L28" class="LineNr"> 28 </span>RETURN<span class="Delimiter">,</span>
<span id="L29" class="LineNr"> 29 </span><span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
<span id="L30" class="LineNr"> 30 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"return"</span><span class="Delimiter">,</span> RETURN<span class="Delimiter">);</span>
<span id="L31" class="LineNr"> 31 </span><a href='001help.cc.html#L218'>put</a><span class="Delimiter">(</span>Recipe_ordinal<span class="Delimiter">,</span> <span class="Constant">"reply"</span><span class="Delimiter">,</span> RETURN<span class="Delimiter">);</span> <span class="Comment">// synonym while teaching</span>
<span id="L32" class="LineNr"> 32 </span><span class="Delimiter">:(before "End Primitive Recipe Checks")</span>
<span id="L33" class="LineNr"> 33 </span><span class="Normal">case</span> RETURN: <span class="Delimiter">{</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// checks will be performed by a transform below</span>
<span id="L35" class="LineNr"> 35 </span><span class="Delimiter">}</span>
<span id="L36" class="LineNr"> 36 </span><span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
<span id="L37" class="LineNr"> 37 </span><span class="Normal">case</span> RETURN: <span class="Delimiter">{</span>
<span id="L38" class="LineNr"> 38 </span> <span class="Comment">// Starting Reply</span>
<span id="L39" class="LineNr"> 39 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L40" class="LineNr"> 40 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9999</span><span class="Delimiter">,</span> <span class="Constant">"trace"</span><span class="Delimiter">)</span> << current_instruction<span class="Delimiter">().</span>name << <span class="Constant">": decrementing callstack depth from "</span> << Trace_stream<span class="Delimiter">-></span>callstack_depth << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Conceal">¦</span> --Trace_stream<span class="Delimiter">-></span>callstack_depth<span class="Delimiter">;</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>Trace_stream<span class="Delimiter">-></span>callstack_depth < <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span><a href='050scenario.cc.html#L60'>clear</a><span class="Delimiter">();</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Delimiter">}</span>
<span id="L47" class="LineNr"> 47 </span> Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>pop_front<span class="Delimiter">();</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Comment">// just in case 'main' returns a value, drop it for now</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Current_routine<span class="Delimiter">-></span>calls<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">goto</span> stop_running_current_routine<span class="Delimiter">;</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9998</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result "</span> << i << <span class="Constant">" is "</span> << <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Comment">// make return products available to caller</span>
<span id="L53" class="LineNr"> 53 </span> copy<span class="Delimiter">(</span>ingredients<span class="Delimiter">.</span>begin<span class="Delimiter">(),</span> ingredients<span class="Delimiter">.</span><a href='003trace.cc.html#L185'>end</a><span class="Delimiter">(),</span> inserter<span class="Delimiter">(</span>products<span class="Delimiter">,</span> products<span class="Delimiter">.</span>begin<span class="Delimiter">()));</span>
<span id="L54" class="LineNr"> 54 </span> <span class="Comment">// End Reply</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Identifier">break</span><span class="Delimiter">;</span> <span class="Comment">// continue to process rest of *caller* instruction</span>
<span id="L56" class="LineNr"> 56 </span><span class="Delimiter">}</span>
<span id="L57" class="LineNr"> 57 </span>
<span id="L58" class="LineNr"> 58 </span><span class="Comment">//: Types in return instructions are checked ahead of time.</span>
<span id="L59" class="LineNr"> 59 </span>
<span id="L60" class="LineNr"> 60 </span><span class="Delimiter">:(before "End Checks")</span>
<span id="L61" class="LineNr"> 61 </span>Transform<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><a href='028call_return.cc.html#L63'>check_types_of_return_instructions</a><span class="Delimiter">);</span> <span class="Comment">// idempotent</span>
<span id="L62" class="LineNr"> 62 </span><span class="Delimiter">:(code)</span>
<span id="L63" class="LineNr"> 63 </span><span class="Normal">void</span> <a href='028call_return.cc.html#L63'>check_types_of_return_instructions</a><span class="Delimiter">(</span><span class="Normal">const</span> <a href='010vm.cc.html#L14'>recipe_ordinal</a> r<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L64" class="LineNr"> 64 </span> <span class="Normal">const</span> recipe& caller = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> r<span class="Delimiter">);</span>
<span id="L65" class="LineNr"> 65 </span> <a href='003trace.cc.html#L161'>trace</a><span class="Delimiter">(</span><span class="Constant">9991</span><span class="Delimiter">,</span> <span class="Constant">"transform"</span><span class="Delimiter">)</span> << <span class="Constant">"--- check types of return instructions in <a href='010vm.cc.html#L19'>recipe</a> "</span> << caller<span class="Delimiter">.</span>name << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction& caller_instruction = caller<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L68" class="LineNr"> 68 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>is_label<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L69" class="LineNr"> 69 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L70" class="LineNr"> 70 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>operation < <a href='010vm.cc.html#L191'>MAX_PRIMITIVE_RECIPES</a><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Conceal">¦</span> <span class="Normal">const</span> recipe& callee = get<span class="Delimiter">(</span>Recipe<span class="Delimiter">,</span> caller_instruction<span class="Delimiter">.</span>operation<span class="Delimiter">);</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>steps<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L73" class="LineNr"> 73 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">const</span> instruction& return_inst = callee<span class="Delimiter">.</span>steps<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>operation != RETURN<span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// check types with the caller</span>
<span id="L76" class="LineNr"> 76 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">)</span> > <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L77" class="LineNr"> 77 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too few values returned from "</span> << callee<span class="Delimiter">.</span>name << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L81" class="LineNr"> 81 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> lhs = return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> reagent<span class="Comment">/*</span><span class="Comment">copy</span><span class="Comment">*/</span> rhs = caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">);</span>
<span id="L83" class="LineNr"> 83 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// End Check RETURN Copy(lhs, rhs)</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!types_coercible<span class="Delimiter">(</span>rhs<span class="Delimiter">,</span> lhs<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L85" class="LineNr"> 85 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>callee<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << return_inst<span class="Delimiter">.</span>name << <span class="Constant">" ingredient '"</span> << lhs<span class="Delimiter">.</span>original_string << <span class="Constant">"' can't be saved in '"</span> << rhs<span class="Delimiter">.</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << end<span class="Delimiter">();</span>
<span id="L86" class="LineNr"> 86 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> << <span class="Constant">" ['"</span> << to_string<span class="Delimiter">(</span>lhs<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">"' vs '"</span> << to_string<span class="Delimiter">(</span>rhs<span class="Delimiter">.</span>type<span class="Delimiter">)</span> << <span class="Constant">"']</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L87" class="LineNr"> 87 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L90" class="LineNr"> 90 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// check that any return ingredients with /same-as-ingredient connect up</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment">// the corresponding ingredient and product in the caller.</span>
<span id="L92" class="LineNr"> 92 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>has_property<span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">"same-as-ingredient"</span><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> string_tree* tmp = property<span class="Delimiter">(</span>return_inst<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">),</span> <span class="Constant">"same-as-ingredient"</span><span class="Delimiter">);</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!tmp || !tmp<span class="Delimiter">-></span>atom<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'same-as-ingredient' metadata should take exactly one value in '"</span> << to_original_string<span class="Delimiter">(</span>return_inst<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">int</span> ingredient_index = <a href='002test.cc.html#L92'>to_integer</a><span class="Delimiter">(</span>tmp<span class="Delimiter">-></span>value<span class="Delimiter">);</span>
<span id="L100" class="LineNr">100 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>ingredient_index >= <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L101" class="LineNr">101 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"too few ingredients in '"</span> << to_original_string<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">)</span> << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L102" class="LineNr">102 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Identifier">goto</span> finish_return_check<span class="Delimiter">;</span>
<span id="L103" class="LineNr">103 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L104" class="LineNr">104 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>!is_dummy<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">))</span> && !is_literal<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">))</span> && caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>name != caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L105" class="LineNr">105 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='003trace.cc.html#L168'>raise</a> << <a href='013update_operation.cc.html#L25'>maybe</a><span class="Delimiter">(</span>caller<span class="Delimiter">.</span>name<span class="Delimiter">)</span> << <span class="Constant">"'"</span> << to_original_string<span class="Delimiter">(</span>caller_instruction<span class="Delimiter">)</span> << <span class="Constant">"' should write to '"</span> << caller_instruction<span class="Delimiter">.</span>ingredients<span class="Delimiter">.</span>at<span class="Delimiter">(</span>ingredient_index<span class="Delimiter">).</span>original_string << <span class="Constant">"' rather than '"</span> << caller_instruction<span class="Delimiter">.</span>products<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">).</span>original_string << <span class="Constant">"'</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L185'>end</a><span class="Delimiter">();</span>
<span id="L106" class="LineNr">106 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L108" class="LineNr">108 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L109" class="LineNr">109 </span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Normal">finish_return_check</span>:<span class="Delimiter">;</span>
<span id="L110" class="LineNr">110 </span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L111" class="LineNr">111 </span> <span class="Delimiter">}</span>
<span id="L112" class="LineNr">112 </span><span class="Delimiter">}</span>
<span id="L113" class="LineNr">113 </span>
<span id="L114" class="LineNr">114 </span><span class="Delimiter">:(scenario return_type_mismatch)</span>
<span id="L115" class="LineNr">115 </span><span class="Special">% Hide_errors = true;</span>
<span id="L116" class="LineNr">116 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L117" class="LineNr">117 </span> <span class="Constant">3</span>:num<span class="Special"> <- </span>f <span class="Constant">2</span>
<span id="L118" class="LineNr">118 </span>]
<span id="L119" class="LineNr">119 </span><span class="muRecipe">def</span> f [
<span id="L120" class="LineNr">120 </span> <span class="Constant">12</span>:num<span class="Special"> <- </span>next-ingredient
<span id="L121" class="LineNr">121 </span> <span class="Constant">13</span>:num<span class="Special"> <- </span>copy <span class="Constant">35</span>
<span id="L122" class="LineNr">122 </span> <span class="Constant">14</span>:point<span class="Special"> <- </span>copy <span class="Constant">12</span>:point/<span class="Special">raw</span>
<span id="L123" class="LineNr">123 </span> <span class="Identifier">return</span> <span class="Constant">14</span>:point
<span id="L124" class="LineNr">124 </span>]
<span id="L125" class="LineNr">125 </span><span class="traceContains">+error: f: return ingredient '14:point' can't be saved in '3:num'</span>
<span id="L126" class="LineNr">126 </span>
<span id="L127" class="LineNr">127 </span><span class="Comment">//: In Mu we'd like to assume that any instruction doesn't modify its</span>
<span id="L128" class="LineNr">128 </span><span class="Comment">//: ingredients unless they're also products. The /same-as-ingredient inside</span>
<span id="L129" class="LineNr">129 </span><span class="Comment">//: the recipe's 'return' indicates that an ingredient is intended to be</span>
<span id="L130" class="LineNr">130 </span><span class="Comment">//: modified in place, and will help catch accidental misuse of such</span>
<span id="L131" class="LineNr">131 </span><span class="Comment">//: 'ingredient-products' (sometimes called in-out parameters in other</span>
<span id="L132" class="LineNr">132 </span><span class="Comment">//: languages).</span>
<span id="L133" class="LineNr">133 </span>
<span id="L134" class="LineNr">134 </span><span class="Delimiter">:(scenario return_same_as_ingredient)</span>
<span id="L135" class="LineNr">135 </span><span class="Special">% Hide_errors = true;</span>
<span id="L136" class="LineNr">136 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L137" class="LineNr">137 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L138" class="LineNr">138 </span> <span class="Constant">2</span>:num<span class="Special"> <- </span>test1 <span class="Constant">1</span>:num <span class="Comment"># call with different ingredient and product</span>
<span id="L139" class="LineNr">139 </span>]
<span id="L140" class="LineNr">140 </span><span class="muRecipe">def</span> test1 [
<span id="L141" class="LineNr">141 </span> <span class="Constant">10</span>:num<span class="Special"> <- </span>next-ingredient
<span id="L142" class="LineNr">142 </span> <span class="Identifier">return</span> <span class="Constant">10</span>:num/same-as-ingredient:<span class="Constant">0</span>
<span id="L143" class="LineNr">143 </span>]
<span id="L144" class="LineNr">144 </span><span class="traceContains">+error: <a href='000organization.cc.html#L113'>main</a>: '2:num <- test1 1:num' should write to '1:num' rather than '2:num'</span>
<span id="L145" class="LineNr">145 </span>
<span id="L146" class="LineNr">146 </span><span class="Delimiter">:(scenario return_same_as_ingredient_dummy)</span>
<span id="L147" class="LineNr">147 </span><span class="muRecipe">def</span> <a href='000organization.cc.html#L113'>main</a> [
<span id="L148" class="LineNr">148 </span> <span class="Constant">1</span>:num<span class="Special"> <- </span>copy <span class="Constant">0</span>
<span id="L149" class="LineNr">149 </span> _<span class="Special"> <- </span>test1 <span class="Constant">1</span>:num <span class="Comment"># call with different ingredient and product</span>
<span id="L150" class="LineNr">150 </span>]
<span id="L151" class="LineNr">151 </span><span class="muRecipe">def</span> test1 [
<span id="L152" class="LineNr">152 </span> <span class="Constant">10</span>:num<span class="Special"> <- </span>next-ingredient
<span id="L153" class="LineNr">153 </span> <span class="Identifier">return</span> <span class="Constant">10</span>:num/same-as-ingredient:<span class="Constant">0</span>
<span id="L154" class="LineNr">154 </span>]
<span id="L155" class="LineNr">155 </span>$error: <span class="Constant">0</span>
<span id="L156" class="LineNr">156 </span>
<span id="L157" class="LineNr">157 </span><span class="Delimiter">:(code)</span>
<span id="L158" class="LineNr">158 </span>string <a href='028call_return.cc.html#L158'>to_string</a><span class="Delimiter">(</span><span class="Normal">const</span> vector<<span class="Normal">double</span>>& in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L159" class="LineNr">159 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">return</span> <span class="Constant">"[]"</span><span class="Delimiter">;</span>
<span id="L160" class="LineNr">160 </span> ostringstream out<span class="Delimiter">;</span>
<span id="L161" class="LineNr">161 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">)</span> == <span class="Constant">1</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L162" class="LineNr">162 </span> <span class="Conceal">¦</span> out << no_scientific<span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">));</span>
<span id="L163" class="LineNr">163 </span> <span class="Conceal">¦</span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L164" class="LineNr">164 </span> <span class="Delimiter">}</span>
<span id="L165" class="LineNr">165 </span> out << <span class="Constant">"["</span><span class="Delimiter">;</span>
<span id="L166" class="LineNr">166 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">int</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < <a href='001help.cc.html#L138'>SIZE</a><span class="Delimiter">(</span>in<span class="Delimiter">);</span> ++i<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L167" class="LineNr">167 </span> <span class="Conceal">¦</span> <span class="Normal">if</span> <span class="Delimiter">(</span>i > <span class="Constant">0</span><span class="Delimiter">)</span> out << <span class="Constant">", "</span><span class="Delimiter">;</span>
<span id="L168" class="LineNr">168 </span> <span class="Conceal">¦</span> out << no_scientific<span class="Delimiter">(</span>in<span class="Delimiter">.</span>at<span class="Delimiter">(</span>i<span class="Delimiter">));</span>
<span id="L169" class="LineNr">169 </span> <span class="Delimiter">}</span>
<span id="L170" class="LineNr">170 </span> out << <span class="Constant">"]"</span><span class="Delimiter">;</span>
<span id="L171" class="LineNr">171 </span> <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span id="L172" class="LineNr">172 </span><span class="Delimiter">}</span>
</pre>
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