/span></code>
          whenever it matches an input by attaching <code class="computeroutput"><span class="identifier">F</span></code>:
        </p>
<pre class="programlisting"><span class="identifier">P</span><span class="special">[</span><span class="identifier">F</span><span class="special">]</span>
</pre>
<p>
          The expression above links <code class="computeroutput"><span class="identifier">F</span></code>
          to the parser, <code class="computeroutput"><span class="identifier">P</span></