[Bug libstdc++/103879] error: accessing value of variant::_Copy_ctor_base through a 'const variant' glvalue in a constant expression

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103879

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> clang rejects it also (with their libc++):

Libc++ doesn't support constexpr std::string, and I think it's missing some DRs
to std::variant as well. So I wouldn't use it to confirm anything like this.