[Bug c++/97846] New: No diagnostic for identifier label in constexpr gunction

[cgnitash at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97846

            Bug ID: 97846
           Summary: No diagnostic for identifier label in constexpr
                    gunction
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: cgnitash at gmail dot com
  Target Milestone: ---

Reproduced from https://stackoverflow.com/questions/64852653

gcc fails to diagnose the use of an identifier label in a constexpr function:


constexpr void f() { x: ; }


clang does diagnose this violation.

Here's an online demo https://godbolt.org/z/1rjjhv