>v</span><span class=
      "special">)
    {
</span>        <span class="keyword">return</span> <span class=
"identifier">parse</span><span class="special">(</span><span class=
"identifier">str</span><span class="special">,

</span>        <span class="comment">    //  Begin grammar
</span>        <span class="special">    (
</span>                <span class="identifier">real_p</span><span class=
"special">[</span><span class="identifier">push_back_a</span><span class=
"special">(</span><span class="ident