anchor.diff:  -export([set_max_age/2]).
   
   -export([set_token/2]).
  +-export([set_type/2]).
  +-export([get_type/1]).
   
   -export([set_error/2]).
   -export([get_error/1]).
  
positive.code: get_sess_token(Pid) ->
      gen_server:call(Pid, get_sess_token).
  
  -spec get_userid(Pid :: pid()) -> {ok, ID::binary()}.
  get_userid(Pid) ->
      gen_server:call(Pid, get_userid).
  
negative.code: -include("watts.hrl").
  -record(state, {
            id = unkonwn,
            type = undefined,
            issuer_id = undefined,
            sess_token = undefined,
            user_agent = undefined,
  