an>
        <span class="keyword">return</span> <span class="keyword">nullptr</span><span class="special">;</span>
    <span class="identifier">p</span><span class="special">.</span><span class="identifier">finish</span><span class="special">(</span> <span class="identifier">ec</span> <span class="special">);</span>
    <span class="keyword">if</span><span class="special">(</span> <span class="identifier">ec</span> <span class="special">)</span>
        <span class="keyword">return</span> <span class="keywo