anchor.diff:             },
     {ok, State}.
   
  +%% @private
   -spec handle_call(any(), any(), state()) -> {noreply, state()}.
   handle_call( await
              , From
  
positive.code: -export([ init/1
          , handle_call/3
          , handle_cast/2
          ]).
  
  -type state() :: #{ count   => integer()
  
negative.code: %% gen_server callbacks
  %%------------------------------------------------------------------------------
  
  %% @private
  -spec init(any()) -> {ok, state()}.
  init(N) ->
    State = #{ count   => N
  