https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109770
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Richard Biener from comment #0) > Base *p = new B; I think if there isn't really a B at this address, then the derived-to-base conversion would be undefined. So on that basis, the compiler should be allowed to assume that there really is a B there.