anchor.diff:                    is_pid(erlang:element(1, Tuple))
             end, Monitors0),
       {Waiters, Monitors, SystemMonitorRecords}.
  +
  +-ifdef(EUNIT).
  +
  +basic_test_() ->
  +    {spawn, fun do_basic_test_run/0}.
   
   do_basic_test_run() ->
       {ok, T} = ?MODULE:start_link({10, testing}, undefined),
  
positive.code: -export([change_tokens/2]).
  -export([start_link/2, init/1, handle_call/3, handle_info/2, handle_cast/2]).
  -export([code_change/3, terminate/2]).
  
  -record(state, {update_status_tref :: reference() | undefined,
                  type :: term(),
  
negative.code:     State.
  
  
  get_waiters_and_monitors(T) ->
      #state{waiters = WaitersTid,
             monitors = MonitorsTid} = gen_server:call(T, get_state, infinity),
  