https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79091
Nathan Sidwell <nathan at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |nathan at gcc dot gnu.org --- Comment #3 from Nathan Sidwell <nathan at gcc dot gnu.org> --- Created attachment 40529 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40529&action=edit Reduced testcase The enum is unnamed, so should be folded to a const inside the ?: expr I guess? Or should the whole expr be folded in the instantiation, or is the instantiation invalid? Need to check std ... Removing the ?: and just having ColMajor as the default doesn't crash.