https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96788
--- Comment #4 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> --- (In reply to Richard Smith from comment #3) > such a literal "has no type" in C, which presumably results in undefined > behavior Ah, no, C11 6.4.4/2 makes this a constraint violation. But either way I think there's room for a vendor extension here.