d">void</span>
<span class="identifier">async_teardown</span><span class="special">(</span>
    <span class="identifier">role_type</span> <span class="identifier">role</span><span class="special">,</span>
    <span class="identifier">basic_stream</span><span class="special">&lt;</span> <span class="identifier">Executor</span> <span class="special">&gt;&amp;</span> <span class="identifier">s</span><span class="special">,</span>
    <span class="identifier">TeardownHandler</span><span class="special">&amp;&am