anchor.diff:      P ! {go, self()}.
   
   stop_collect(P) ->
  -    P ! {done, self()},
  +    stop_collect(P, done).
  +stop_collect(P, Order) ->
  +    P ! {Order, self()},
       receive
   	{gone, P} ->
   	    ok
  
positive.code:     end;
  loop_runner_cont(Collector, Fun, N, Laps) ->
      Fun(),
      loop_runner_cont(Collector, Fun, N+1, Laps).
  
  
  f1(X) ->
  
negative.code:     %%receive after 10*1000 -> ok end,
  
      stop_collect(P1),
      stop_collect(P2, abort),
      ok.
      
  otp_9422_tracee() ->
  