lass="computeroutput"><span class="keyword">true</span></code> means success (i.e. the parser has matched)
        or <code class="computeroutput"><span class="keyword">false</span></code> (i.e. the parser didn't
        match). This is equivalent to the former old <code class="computeroutput"><span class="identifier">parse_info</span></code>
        member <code class="computeroutput"><span class="identifier">hit</span></code>. <span class="emphasis"><em>Spirit.Qi</em></span>
        doesn't support tracki