anchor.diff:  -export([start_link/0]).
   
   -export([get_user/2]).
  +-export([remove_user_by_pid/1]).
   
   %% gen_server.
   -export([init/1]).
  
positive.code: %% set_pid_for_id(ID,Pid) ->
  %%    tts_data:user_update_pid(ID,Pid). 
  
  %% delete_session(ID) ->
  %%     tts_data:user_delete(ID),
  %%     ok.
  
negative.code: get_user(UserSubject, Issuer) ->
      load_or_return_user({UserSubject, Issuer}).
  
  -spec remove_user_by_pid(Pid :: pid()) -> ok.
  remove_user_by_pid(Pid) ->
      gen_server:call(?MODULE,{delete_user_pid,Pid}).
  
  %% gen_server.
  
  init([]) ->
  