an class="special">[</span><span class="identifier">a</span><span class="special">]</span> <span class="special">:</span> <span class="identifier">Unused</span></pre>
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<h6>
<a name="spirit.qi.reference.directive.expect.h6"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.expect.complexity"></a></span><a class="link" href="expect.html#spirit.qi.reference.directive.expect.complexity">Complexity</a>
   