anchor.diff:      erlang:system_flag(scheduler_wall_time, true),
       receive
   	_Msg ->
  -	    %% erlang:system_flag(scheduler_wall_time, false)
  +	    erlang:system_flag(scheduler_wall_time, false),
   	    ok
       after Time ->
   	    _M = Parent ! {stats, 1,
  
positive.code:     end.
  
  flag_holder_proc(Collector) ->
      Ref = erlang:monitor(process,Collector),
      receive
  	{'DOWN',Ref,_,_,_} ->
  	    %% erlang:system_flag(scheduler_wall_time,false)
  	    ok
      end.
  
  
negative.code: 
      case SchedulerWallTime of
  	undefined ->
              spawn(fun() -> flag_holder_proc(Collector) end),
              ok;
  	_ ->
  