[Bug c++/84030] New: Name lookup in presence of namespace

[Zahira.Ammarguellat at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84030

            Bug ID: 84030
           Summary: Name lookup in presence of namespace
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Zahira.Ammarguellat at intel dot com
  Target Milestone: ---

In the code snippet below gcc doesn't give any diagnostics:


struct A_ { };
namespace N_ {
  struct A_ {
    int g()
    {
      return 3;
    }
    template<class T> operator T()
    {
      return T();
    }
  };
}

int main(int argc, char *argv[])
{
  N_::A_ a;
  int b = a.operator A_().g();
  return b == 3;
}

gcc seems to be choosing "N_::A_::A_" operator. But in reality there should be
ambiguity between that and A::operator?
Both clang and MSVC fail to disambiguate it. 

See https://godbolt.org/#