https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103732
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #3) > > constexpr int y = s0.C; > > > The above is now valid due to https://wg21.link/p2280r2 (which was acecpted > as a defect report against all C++ versions). Note the paper in the end is https://wg21.link/p2280 .