https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104013
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #3) > DR 2137 is the one. No other compiler implements it. Note this is defect report against the c++ standard. There are others which related to the single initializer_list going to scalar too.