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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>failure</a>::<wbr><a class="macro" href=''>ensure</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class="rust macro">
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">ensure</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">cond</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=&gt;</span> { ... };
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}</pre>
<div class='docblock'><p>Exits a function early with an <code>Error</code> if the condition is not satisfied.</p>
<p>Similar to <code>assert!</code>, <code>ensure!</code> takes a condition and exits the function
if the condition fails. Unlike <code>assert!</code>, <code>ensure!</code> returns an <code>Error</code>,
it does not panic.</p>
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