pan class="special">...&gt;</span> <span class="special">--&gt;</span> <span class="identifier">duplicate</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">A</span>
<span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--&gt;</span> <span class="identifier">duplicate</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</sp