n class="o">&gt;</span><span class="p">;</span>
  <span class="k">using</span> <span class="n">_base</span> <span class="o">=</span> <span class="n">asio</span><span class="o">::</span><span class="n">async_result</span><span class="o">&lt;</span><span class="n">CompletionToken</span><span class="p">,</span> <span class="kt">void</span><span class="p">(</span><span class="n">result_type</span><span class="p">)</span><span class="o">&gt;</span><span class="p">;</span>
  <span class="c1">// The awaitable type