Issue 2621 claimed to ask the question whether lookup for using enum declarations was supposed to be type-only, but the example actually highlighted the difference between elaborated-type-specifier lookup (where finding nothing but typedef names is ill-formed) and ordinary lookup.

However, consider:

  enum A {
    x, y
  };
  void f() {
    int A;
    using enum A;      // #1, error: names non-type int A
    using T = enum A;  // #2, OK, names ::A
  }

The two situations should both be type-only lookups for consistency, although #2 would not find typedefs.

Possible resolution:

Change in 9.7.2 [enum.udecl] paragraph 1 as follows:

A using-enum-declarator names the set of declarations found by type-only lookup (6.5.1 [basic.lookup.general] 6.5.3 [basic.lookup.unqual], 6.5.5 [basic.lookup.qual]) for the using-enum-declarator (6.5.3 [basic.lookup.unqual], 6.5.5 [basic.lookup.qual]). The using-enum-declarator shall designate a non-dependent type with a reachable enum-specifier.