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<pre id='vimCodeElement'>
<span class="Comment"># compare mutable.mu</span>

<span class="muRecipe">def</span> main [
  <span class="Constant">local-scope</span>
  x:&amp;:num<span class="Special"> &lt;- </span>new <span class="Constant">number:type</span>
  foo x
]

<span class="muRecipe">def</span> foo x:&amp;:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  *x<span class="Special"> &lt;- </span>copy <span class="Constant">34</span>  <span class="Comment"># will cause an error because x is immutable in this function</span>
]
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