e procedure
invoked by a-sync (which supplies the &rsquo;await&rsquo; and &rsquo;resume&rsquo; arguments).
It will normally be necessary to call event-loop-block! on &rsquo;waiter&rsquo;
(or on the default event loop) before invoking this procedure.
</p>
<p>This procedure calls &rsquo;await&rsquo; and will return when the generator has
finished.  It must (like the a-sync procedure) be called in the same
thread as that in which the &rsquo;waiter&rsquo; or default event loop runs (as
the case may be).
</p>
<p