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<div class="declaration" id="func-withextendedlifetime-t-result_-t_-throws-result">
<a class="toggle-link" data-toggle="collapse" href="#comment-func-withextendedlifetime-t-result_-t_-throws-result">func withExtendedLifetime&lt;T, Result&gt;(<wbr>_:<wbr> T,  _: () throws -&gt; Result)</a>
        
<div class="comment collapse" id="comment-func-withextendedlifetime-t-result_-t_-throws-result"><div class="p">
    <p>Evaluate <code>f()</code> and return its result, ensuring that <code>x</code> is not
des