[Bug c++/84026] invalid 'unnamed scoped enum is not allowed' when scoped enum has a full qualified-id

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84026

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed testcase (so it doesn't define S1::E1 twice):

    struct S1 {
      enum class E1;
    };
    enum class S1::E1 {}; // OK

    struct S2 {
      enum class E2;
    };
    enum class ::S2::E2 {}; // Not OK