Merge pull request #1839 from gfldex/patch-8

tell that whenever reacts to a closed Channel

doc/Type/Channel.pod6

@@ -100,7 +100,9 @@ Close the C<Channel>, normally.  This makes subsequent C<send> calls die with
 L<X::Channel::SendOnClosed>.  Subsequent calls of C<.receive> may still drain
 any remaining items that were previously sent, but if the queue is empty, will
 throw an L<X::Channel::ReceiveOnClosed> exception.  A C<Seq> produced by an
-C<@()> or by the C<.list> method will not terminate until this has been done.
+C<@()> or by the C<.list> method will not terminate until this has been done. 
+A L<whenever|/language/concurrency#index-entry-whenever>-block will also
+terminate properly on a closed channel.
 
     my $c = Channel.new;
     $c.close;