https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78890
TC <rs2740 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rs2740 at gmail dot com --- Comment #3 from TC <rs2740 at gmail dot com> --- [class.union]/3 in the current WP (/2 in N3337/N4140) says (among other things): If a union contains a non-static data member of reference type the program is ill-formed.