[Bug c++/83132] New: Error while redeclaring an enum with extra qualification

[jenda.tusil at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83132

            Bug ID: 83132
           Summary: Error while redeclaring an enum with extra
                    qualification
           Product: gcc
           Version: 7.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jenda.tusil at gmail dot com
  Target Milestone: ---

g++ -std=c++14 does not compile this:

enum E : int;
enum ::E : int{};

It says:
2:10: error: expected unqualified-id before ‘:’ token

Clang compiles it without errors, but gives a little wierd warning:
warning: extra qualification on member 'E' [-Wextra-qualification]

The bug was found in the context of this SO thread:
https://stackoverflow.com/q/47383199/6209703

It manifestes in most (all?) gcc versions on https://gcc.godbolt.org/