https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86221

            Bug ID: 86221
           Summary: _Generic not match function return that has _Atomic
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tydeman at tybor dot com
  Target Milestone: ---

static int * f1(void){return NULL;}
int main(void){
 int i = _Generic(f1, int * _Atomic (*)(void): 1, default: 0);
 return i;
}

The above _Generic() should match, but does not.

If _Atomic is replaced with any of: const, volatile, restrict,
then it works as expected.

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