r>_: @autoclosure (<wbr>) -&gt; Bool, _: @autoclosure (<wbr>) -&gt; String, file:<wbr> StaticString, line: UInt)</a>
        
<div class="comment collapse" id="comment-func-precondition_-autoclosure-bool_-autoclosure-string-file_-staticstring-line_-uint"><div class="p">
    <p>Checks a necessary condition for making forward progress.</p>

<p>Use this function to detect conditions that must prevent the program from
proceeding, even in shipping code.</p>

<ul><li><p>In playgrounds and <code>-Onone</code> buil