[Bug c/91815] questionable error on type definition at file scope

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91815

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The fixlet slightly breaks Objective-C:

+FAIL: objc.dg/headers.m -fgnu-runtime (test for excess errors)
+FAIL: objc.dg/id-1.m -fgnu-runtime  (test for errors, line 4)
+FAIL: objc.dg/id-1.m -fgnu-runtime  (test for warnings, line )

It looks like the Objective-C compiler uses the code to deal with declarations
conflicting with (or shadowing) the declarations of the basic types in objc.h.