[Bug c/128335] New: [15/16/17 Regression] Incorrect type of enumeration constant in redeclaration of enumeration constant, again

[luigighiron at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128335

            Bug ID: 128335
           Summary: [15/16/17 Regression] Incorrect type of enumeration
                    constant in redeclaration of enumeration constant,
                    again
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: luigighiron at gmail dot com
  Target Milestone: ---

The following code is incorrectly rejected by GCC:

enum E{A=1,B=_Generic(A,int:-1U,default:1U)};
enum E{A=1,B=_Generic(A,int:-1U,default:1U)};

See also PR115109, the type of A in the redeclaration should be int as that is
the type the enumeration constant had previously. This is a regression since
the behavior was correct in 14 when the value was representable in int.