anchor.diff:      end,
       {ok, State}.
   
  --spec handle_call(any(), state_annotations()) -> {ok, any(), state_annotations()}.
  +-spec handle_call(any(), state()) -> {ok, ok, state()}.
   handle_call(_Request, State) ->
  -    Reply = ok,
  -    {ok, Reply, State}.
  +    {ok, ok, State}.
   
  --spec handle_info(any(), state_annotations()) -> {ok, state_annotations()}.
  +-spec handle_info(any(), state()) -> {ok, state()}.
   handle_info(_Info, State) ->
       {ok, State}.
   
  
positive.code:             ok
      end.
  
  -spec annotation(event()) -> {tag(), list(), list()} | {binary(), list(any())} | ignore.
  annotation({dist_do, Scenario, Start, End, Nodes, Comment}) ->
      {<<"amoc start">>, "Scenario: ~p. comment: ~p Start: ~p. End: ~p. Nodes: ~p.",
       [Scenario, Comment, Start, End, length(Nodes)]};
  
negative.code: terminate(_Reason, _State) ->
      ok.
  
  -spec code_change(any(), any(), any()) -> {ok, state()}.
  code_change(_OldVsn, State, _Extra) ->
      {ok, State}.
  
  