[Bug c++/103084] Accepts invalid using enum declaration with an invalid elaborated-type-specifier

[terra at gnome dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103084

--- Comment #6 from M Welinder <terra at gnome dot org> ---
elaborated-enum-specifier can be a elaborated-type-specifier.  It is in the
"enum Hog H;" case.

But elaborated-enum-specifier is NOT an elaborated-type-specifier in the "using
enum Hog;" case,

See http://eel.is/c++draft/enum.udecl -- this uses elaborated-enum-specifier
directly.