">::</span><span class="identifier">rule</span><span class="special">&lt;</span><span class="identifier">person_class</span><span class="special">,</span> <span class="identifier">ast</span><span class="special">::</span><span class="identifier">person</span><span class="special">&gt;</span> <span class="keyword">const</span> <span class="identifier">person</span> <span class="special">=</span> <span class="string">"person"</span><span class="special">;</span>
    <span class="identifier">x3</span><span cla