r>) -&gt; String, file:<wbr> StaticString, line: UInt)</a>
        
<div class="comment collapse" id="comment-func-assertionfailure_-autoclosure-string-file_-staticstring-line_-uint"><div class="p">
    <p>Indicates that an internal sanity check failed.</p>

<p>Use this function to stop the program, without impacting the performance of
shipping code, when control flow is not expected to reach the call---for
example, in the <code>default</code> case of a <code>switch</code> where you have knowledge that
one 