an><span class=identifier>k</span><span class=special>;</span></code><br>
        <br>
        Once such a C++ extension is accepted into the standard, this would be 
        a neat solution and a nice fit for our purpose. It's not a complete solution 
        though since there are still situations where we do not know the rhs beforehand; 
        for instance when pre-declaring cyclic dependent rules.</p>
    </td>
  </tr>
</table>
<p>Fortunately, rules come to the rescue. Rules can capture the type of th