[Bug c++/100459] New: [10/11 regression] constexpr decltype(auto) variable declaration bogus cv qual error

[wjwray at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100459

            Bug ID: 100459
           Summary: [10/11 regression] constexpr decltype(auto) variable
                    declaration bogus cv qual error
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wjwray at gmail dot com
  Target Milestone: ---

GCC11 rejects:

    constexpr decltype(auto) i = 0;

GCC>10 error: decltype(auto) cannot be cv-qualified

GCC<=10 accepts (Clang & MSVC too) https://godbolt.org/z/q75nMKvs8