anchor.diff:  
   init([{'__gen_listener_tcp_mod', Module} | InitArgs]) ->
       process_flag(trap_exit, true),
  -
  -    error_logger:info_msg("About to call gen_tcp:listen()"),
   
       case Module:init(InitArgs) of
           {ok, {Port, Options}, ModState} ->
  
positive.code: -module(gen_listener_tcp).
  -behaviour(gen_server).
  
  
negative.code: 	 reply/2
  	]).
  
  
  -export([
  	 init/1,
  	 handle_call/3,
  