https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89585
--- Comment #2 from Harald van Dijk <harald at gigawatt dot nl> --- This was intentionally(!) broken in a backport, https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=267534, which specifically adds a test that this results not even in a user-friendly error message, but a bad syntax error, even though it had previously been accepted.
