anchor.diff:  
   ms_lookup([A|_] = MS, _) when is_atom(A); is_tuple(A) -> MS;
   ms_lookup("default", User) ->
  -    ?GET_CONFIG({trace_ms, "default"}, User, [{'_', [], []}],
  +    ?GET_CONFIG({trace_ms, "default"}, [User], [{'_', [], []}],
                   "default smallest match specification for debug tracing");
   ms_lookup(MS, User) -> ?LOOKUP_CONFIG(MS, User).
   
  
positive.code:             case lists:usort(Wlus ++ W) of
                  Wlus -> Wlus; % already added
                  NewWlus ->
                      ?GET_CONFIG(trace_local_wl, U, NewWlus,
                          "list of MFAs safe to trace on local node")
              end;
          _ ->
              ?GET_CONFIG(trace_local_wl, U, lists:usort(W),
                          "list of MFAs safe to trace on local node")
      end.
  
  
negative.code: dbg:tpl(erlang, now, '_', [{'_', [], [{return_trace}]}]).
  dbg:p(all, [c]).
  
  -endif.
  