 variable that can hold a parser), then we store the parser
      as a rule like this:
    </p>
    
<pre><code><font color="#000000">    </font></code><code><font color="#000000"><span class=
      "identifier">r</span> <span class="special">=</span> <span class=
      "identifier">real_p</span> <span class=
      "special">&gt;&gt; *(</span><span class=
      "identifier">ch_p</span><span class="special">(</span><span class=
      "literal">','</span><span class="special">) &gt;&gt;</span> <span class=
  