https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50060
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Created attachment 38912 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38912&action=edit gcc7-pr50060.patch Untested patch (for -std=c++14 and later only).