anchor.diff:  -endif.
   -ifdef(SIMULATION).
   
  --type mypid_plain() :: erl_pid_plain().
   %% @doc SIMULATION: Returns the pid of the current process.
   -spec this() -> pid().
   this() ->
  
positive.code:          send_to_group_member/3, send_local/2, make_global/1, is_valid/1,
           get_msg_tag/1]).
  
  -type cookie() :: any().
  -type reg_name() :: atom().
  -type erl_local_pid_plain() :: pid() | reg_name().
  
negative.code: -endif.
  -ifdef(BUILTIN).
  
  %% @doc BUILTIN: Returns the pid of the current process.
  -spec this() -> pid().
  this() ->
  