ass="computeroutput"><span class="identifier">P</span></code></span></dt>
<dd><p>
                a parser type
              </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">context</span></code></span></dt>
<dd><p>
                A context type (can be unused_type)
              </p></dd>
</dl>
</div>
<p>
          The <span class="emphasis"><em>attribute</em></span> metafunction returns the expected attribute
          type of the parser. In some cases, this is cont