n class="identifier">A_a</span><span class="special">,</span> <span class="identifier">a</span><span class="special">)</span>
<em class="replaceable"><code><span class="identifier">MACRO</span></code></em><span class="special">(</span><span class="number">2</span><span class="special">,</span> <span class="identifier">typename_A</span><span class="special">,</span> <span class="identifier">A</span><span class="special">,</span> <span class="identifier">A_a</span><span class="special">,</span> <span class="i