anchor.diff:      {noreply,St};
   handle_info(kill_group_leaders, #st{gls=Gls,stopping=From,
   				    pending_ops=Ops}=St) ->
  -    [exit(GL, kill) || GL <- gb_sets:to_list(Gls)],
  +    _ = [exit(GL, kill) || GL <- gb_sets:to_list(Gls)],
       if From /= undefined ->
   	    gen_server:reply(From, ok);
          true ->					% reply has been sent already
  
positive.code: 				   none ->
  				       {Fds,Tags};
  				   {value,Fd} ->
  				       file:close(Fd),
  				       {gb_trees:delete(Tag, Fds),
  					lists:delete(Tag, Tags)}
  			       end
  
negative.code: 	   true ->
  		%% Fd ready, print anything buffered for associated Tag
  		lists:filtermap(fun({T,From,Str}) when T == Tag ->
  					_ = output(From, Tag, Str, St1),
  					false;
  				   (_) ->
  					true
  