https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66643
--- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> --- Created attachment 37610 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37610&action=edit A preliminary patch Attached patch gives a diagnostic. Interestingly I found three test cases in the test suite that use the invalid construct.
