it.support.multi_pass.h5"></a>
        <span class="phrase"><a name="spirit.support.multi_pass.dealing_with_constant_look_ahead"></a></span><a class="link" href="multi_pass.html#spirit.support.multi_pass.dealing_with_constant_look_ahead">Dealing
        with constant look ahead</a>
      </h5>
<p>
        There is one other pre-defined class called <code class="computeroutput"><span class="identifier">look_ahead</span></code>.
        The class <code class="computeroutput"><span class="identifier">look_ahea