s an error if
this procedure is given a different event loop than the one which was
passed to make-meeting on constructing the &rsquo;meeting&rsquo; objects.
</p>
<p>This procedure is intended to be called within a waitable procedure
invoked by a-sync (which supplies the &rsquo;await&rsquo; and &rsquo;resume&rsquo; arguments).
</p>
<p>With version 0.15 of this library, a receiver could not invoke this
procedure when another a-sync or compose-a-sync block running on the
event loop concerned was already waiti