[Bug c++/120261] GCC rejects valid constexpr value initialization with private members (with one member has NSDMI)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120261

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
MSVC rejected it until v19.27 (circa 2019, I think?) so I think it's a much
more recent change.