">parser</span> <span class="special">=</span> <span class="identifier">with</span><span class="special">&lt;</span><span class="identifier">tag2</span><span class="special">&gt;(</span><span class="identifier">data2</span><span class="special">)[</span><span class="identifier">p</span><span class="special">];</span>
    <span class="identifier">x3</span><span class="special">::</span><span class="identifier">parse</span><span class="special">(</span><span class="identifier">first</span><span class="special