. If test returns
            true, <code class="computeroutput"><span class="identifier">rest</span></code> will be evaluated.
            Otherwise, the production will return early with a no-match without ever
            touching rest.
          </p>
<h6>
<a name="spirit.qi.reference.auxiliary.eps.h3"></a>
            <span class="phrase"><a name="spirit.qi.reference.auxiliary.eps.header"></a></span><a class="link" href="eps.html#spirit.qi.reference.auxiliary.eps.header">Header</a>
          </h6>
<pre 