anchor.diff:  %% gen_fsm:sync_send_all_state_event/2,3, this function is called to handle
   %% the event.
   %%--------------------------------------------------------------------
  -handle_sync_event(Event, From, StateName, State) ->
  +handle_sync_event(_Event, _From, StateName, State) ->
       Reply = ok,
       {reply, Reply, StateName, State}.
   
  
positive.code: %%--------------------------------------------------------------------
  start_link() ->
      gen_fsm:start_link(?MODULE, [], []).
  
  %%====================================================================
  %% gen_fsm callbacks
  
negative.code: -behaviour(gen_fsm).
  
  %% API
  -export([start_link/0, token/1]).
  
  %% gen_fsm callbacks
  -export([init/1, handle_event/3, initializing/2, waiting_check/2, started/2,
  	 stopped/2, handle_sync_event/4, handle_info/3, terminate/3,
  	 code_change/4]).
  
  -record(state, {path = none,
  		torrent = none,
  