https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83778
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 43118 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43118&action=edit gcc8-pr83778.patch This restores the previous behavior for me. Note, the question is whether the 4 is really invalid, in that case perhaps we shouldn't fold it to something early and let it error during expansion.
