anchor.diff:                  buffer = Buffer,
                   peername = PeerName,
                   connect_time = ConnectTime,
  -                cb = {logplex_worker, logplex_worker:init_state()}}};
  +                cb = ?DEFAULT_MSG_CB}};
   
   code_change(v33, {state, Sock, Buffer, PeerName}, _Extra) ->
       %% Can't easily obtain a connection timestamp for an established connection.
  
positive.code: %% gen_server callbacks
  %%====================================================================
  init([]) ->
      {ok, #state{}}.
  
  handle_call(Msg, _From, State) ->
      ?WARN("err=unexpected_call data=~p", [Msg]),
  
negative.code:                 cb :: 'undefined' | {Module::atom(), State::term()}
                 }).
  
  -define(DEFAULT_MSG_CB,
          {logplex_worker, logplex_worker:init_state()}).
  
  -include("logplex_logging.hrl").
  
  %%====================================================================
  