[Bug c/86709] New: 'short type-name' is invalid

["zhonghao at pku dot org.cn" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86709

            Bug ID: 86709
           Summary: 'short type-name' is invalid
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhonghao at pku dot org.cn
  Target Milestone: ---

gcc allows ``short'' to appear with a typedef'd char:

typedef unsigned char __u8;
__u8 short slot_tablelen;

is accepted, but

unsigned char short slot_tablelen;

is not, which doesn't make sense to me.  (In C99, short is
not allowed with any typedef'd name -- I'm not sure why it's
allowed in gcc.)

My gcc is gcc version 9.0.0 20180715 (experimental) (GCC)

I tried clang++. It rejects both code samples:

error: 'short type-name' is invalid
__u8 short slot_tablelen;
     ^
1 error generated.

error: 'short char' is invalid
unsigned char short slot_tablelen;
              ^
1 error generated.