https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123577
--- Comment #1 from Anthony Cozzolino <ajcozzol at us dot ibm.com> --- Note: I'm not sure if leaving ret uninitialized is actually a constexpr violation to begin with, but since that is being enforced in C++17 mode, it would be nice to have a proper error message.
