anchor.diff:  
   -spec bp_step(pid()) -> {module(), On::atom(), comm:message()}.
   bp_step(Pid) ->
  -    ?TRACE_BP_STEPS("Do step ~p ~p~n", [Pid, pid_groups:group_and_name_of(Pid)]),
  +    ?TRACE_BP_STEPS("Do step ~p ~p~n", [Pid, catch pid_groups:group_and_name_of(Pid)]),
       Pid !  {'$gen_component', bp, breakpoint, step, self()},
       receive {'$gen_component', bp, breakpoint, step_done,
                _GCPid, Module, On, Msg} ->
  
positive.code:              Msg,
               gc_mod(State),
               gc_hand(State),
               self(), pid_groups:group_and_name_of(self()),
               erlang:get(test_server_loc),
               State,
               Stacktrace]),
  
negative.code:                     "*** Start handling message...~n"
                      "    Process: ~p (~p)~n"
                      "    Message: ~.0p~n",
                      [self(), catch pid_groups:group_and_name_of(self()), _Msg]),
      T2State;
  on_bp_req_in_bp(_Msg, State,
                  {'$gen_component', bp, breakpoint, cont},
  