https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124444
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #0) > Wonder if for C++20 the body doesn't have to be moved to a non-constexpr > function template. I think we could just put the `if (std::__is_constant_evaluated())` checks back on the caller side, instead of inside the _M_invalidate_if() function.
