anchor.diff:  %% @end 
   %%--------------------------------------------------------------------
   handle_call(running, _From, State = #state{running=Running}) ->
  -  {reply, Running, State}.
  +  {reply, Running, State};
  +  
  +handle_call(diffs, _From, State = #state{diffs=Diffs}) ->
  +  {reply, Diffs, State}.
   
   %%--------------------------------------------------------------------
   %% @spec handle_cast(Msg, State) -> {noreply, State} |
  
positive.code: %%--------------------------------------------------------------------
  %%% Internal functions
  %%--------------------------------------------------------------------
  
negative.code: %% @end 
  %%--------------------------------------------------------------------
  init([]) ->
      {ok, #state{running=[],diffs=[]}}.
  
  %%--------------------------------------------------------------------
  %% @spec 
  