https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91980
--- Comment #3 from Keith Thompson <Keith.S.Thompson at gmail dot com> ---
Not surprisingly, when I modify my "complex-bug.c" changing
#include <complex.h>
to
#include "complex.h"
and add a "complex.h file containing only
#define complex _Complex
the problem goes away (i.e., the correct diagnostic is printed).
