anchor.diff:  %% Cancel an interval timer.
   handle_call({cancel, {interval, TRef}}, _From, Tab) ->
       _ = case remove_timer(TRef, Tab) of
  -        true ->
  -            demonitor(TRef, [flush]);
  -        false ->
  -            ok
  -    end,
  +            true ->
  +                demonitor(TRef, [flush]);
  +            false ->
  +                ok
  +        end,
       {reply, {ok, cancel}, Tab};
   %% Unexpected.
   handle_call(_Req, _From, Tab) ->
  
positive.code: handle_call({apply_once, {Started, Time, MFA}}, _From, Tab) ->
      Timeout = Started + Time,
      Reply = try
                  erlang:start_timer(
                    Timeout,
                    self(),
                    {apply_once, MFA},
                    [{abs, true}]
                   )
              of
                  SRef ->
                      ets:insert(Tab, {SRef}),
  
negative.code:     ok;
  terminate(Reason, Tab) ->
      _ = ets:foldl(fun
                        ({TRef}, Acc) ->
                            _ = cancel_timer(TRef),
                            Acc;
                        ({_TRef, TPid, Tag}, Acc) ->
                            TPid ! {cancel, Tag},
                            Acc
                    end,
                    undefined,
                    Tab),
      true = ets:delete(Tab),
      terminate(Reason, undefined).
  
  