anchor.diff:  
   -module(couch_replicator_manager).
   -behaviour(gen_server).
  --vsn(1).
  +-vsn(2).
   -behaviour(config_listener).
   
   % public API
  
positive.code: handle_config_change(_, _, _, _, S) ->
      {ok, S}.
  
  
  init(_) ->
      process_flag(trap_exit, true),
  
negative.code: -export([changes_reader/3, changes_reader_cb/3]).
  
  % config_listener callback
  -export([handle_config_change/5, handle_config_terminate/3]).
  
  -export([handle_db_event/3]).
  
  