anchor.diff:  		  ok
   	  end,
       ?line my_dummy_handler ! {swap_info,dummy1_h,swap},
  -    ?t:sleep(1000),
       ?line [dummy1_h] = gen_event:which_handlers(my_dummy_handler),
       ?line my_dummy_handler ! Info,
       ?line receive
  
positive.code: 	  end,
      ?line ok = gen_event:notify(my_dummy_handler,
  				{swap_event, {dummy1_h, 9}, swap}),
      ?t:sleep(1000),
      ?line [{dummy1_h,9}] = gen_event:which_handlers(my_dummy_handler),
      ?line ok = gen_event:notify(my_dummy_handler, Event),
      ?line receive
  
negative.code: 		  ok
  	  end,
      ?line my_dummy_handler ! {swap_info,{dummy1_h,2},swap},
      ?line [{dummy1_h,2}] = gen_event:which_handlers(my_dummy_handler),
      ?line my_dummy_handler ! Info,
      ?line receive
  