 one of the helper
await-* procedures provided by this library has been called but has
not yet returned, it may fail to complete, as its continuation may
disappear - it will be as if the a-sync or compose-a-sync block
concerned had come to an end.  It may therefore be best only to call
this procedure on an event loop after all await-* procedures which are
executing in it have returned.
</p>
<p>This procedure should not throw an exception unless memory is
exhausted.
</p></dd></dl>

<dl class="def">
<dt id="i