hatTakesCompletionBlock</span><span class="p">(</span><span class="nv">completion</span><span class="p">:</span> <span class="p">(</span><span class="kt">Bool</span><span class="p">,</span><span class="kt">Error</span><span class="p">?)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
<h3 id='a-name-example5-1-a-working-with-non-escaping-closures' class='heading'><a name="example5.1"></a> Working with non escaping closures</h3>

