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<pre id='vimCodeElement'>
<span class="Comment">//: Allow mu programs to log facts just like we've been doing in C++ so far.</span>
<span class="Delimiter">:(scenario trace)</span>
recipe main [
trace [foo]<span class="Delimiter">,</span> [this is a trace in mu]
]
<span class="traceContains">+foo: this is a trace in mu</span>
<span class="Delimiter">:(before "End Primitive Recipe Declarations")</span>
TRACE<span class="Delimiter">,</span>
<span class="Delimiter">:(before "End Primitive Recipe Numbers")</span>
Recipe_number[<span class="Constant">"trace"</span>] = TRACE<span class="Delimiter">;</span>
<span class="Delimiter">:(before "End Primitive Recipe Implementations")</span>
case TRACE: <span class="Delimiter">{</span>
assert<span class="Delimiter">(</span>isa_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients[<span class="Constant">0</span>]<span class="Delimiter">));</span>
string label = current_instruction<span class="Delimiter">().</span>ingredients[<span class="Constant">0</span>]<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
assert<span class="Delimiter">(</span>isa_literal<span class="Delimiter">(</span>current_instruction<span class="Delimiter">().</span>ingredients[<span class="Constant">1</span>]<span class="Delimiter">));</span>
string message = current_instruction<span class="Delimiter">().</span>ingredients[<span class="Constant">1</span>]<span class="Delimiter">.</span>name<span class="Delimiter">;</span>
trace<span class="Delimiter">(</span>label<span class="Delimiter">)</span> << message<span class="Delimiter">;</span>
<span class="Identifier">break</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>
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