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<a href='https://github.com/akkartik/mu/blob/master/immutable-error.mu'>https://github.com/akkartik/mu/blob/master/immutable-error.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># compare mutable.mu</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="muRecipe">def</span> <a href='immutable-error.mu.html#L3'>main</a> [
<span id="L4" class="LineNr"> 4 </span>  <span class="Constant">local-scope</span>
<span id="L5" class="LineNr"> 5 </span>  x:&amp;:num <span class="Special">&lt;-</span> new <span class="Constant">number:type</span>
<span id="L6" class="LineNr"> 6 </span>  <a href='immutable-error.mu.html#L9'>foo</a> x
<span id="L7" class="LineNr"> 7 </span>]
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="muRecipe">def</span> <a href='immutable-error.mu.html#L9'>foo</a> x:&amp;:num [
<span id="L10" class="LineNr">10 </span>  <span class="Constant">local-scope</span>
<span id="L11" class="LineNr">11 </span>  <span class="Constant">load-inputs</span>
<span id="L12" class="LineNr">12 </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>
<span id="L13" class="LineNr">13 </span>]
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