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:     {reply, {ok, MA}, State, MA};
  handle_call({set_max_age, MA}, _From, State) ->
      {reply, ok, State#state{max_age=MA}, MA};
  handle_call({set_iss_sub, Issuer, Subject}, _From,
              #state{max_age=MA, user_info=Info}=State) ->
      {ok, NewInfo} = watts_userinfo:update_iss_sub(Issuer, Subject, Info),
  
negative.code: -include("watts.hrl").
  -record(state, {
            id = unkonwn,
            type = undefined,
            issuer_id = undefined,
            sess_token = undefined,
            user_agent = undefined,
  