anchor.diff:  
   all() -> 
       [system_profile_on_and_off, runnable_procs,
  -     runnable_ports, scheduler].
  +     runnable_ports, scheduler, dont_profile_profiler].
   
   groups() -> 
       [].
  
positive.code: 	    end
          end, Events).
  
  wait(Time) -> receive after Time -> ok end.
  
  %%%
  
negative.code: 	system_profile_on_and_off/1,
  	runnable_procs/1,
  	runnable_ports/1,
  	dont_profile_profiler/1,
  	scheduler/1
          ]).
  
  