anchor.diff:                  parser,
                   ssl = false,
                   compress = false,
  -                event_client}).
  +                event_client,
  +                filter = fun (_) -> true end}).
   
   %%%===================================================================
   %%% API
  
positive.code: 
  get_transport(#transport{rcv_pid = Pid}) ->
      gen_server:call(Pid, get_transport).
  
  %%%===================================================================
  %%% gen_server callbacks
  
negative.code:          use_zlib/2,
           get_transport/1,
           reset_parser/1,
           stop/1,
           set_filter/2]).
  
  %% gen_server callbacks
  -export([init/1,
  