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/* { dg-do compile } */
/* { dg-options "-std=gnu11 -Wc99-c11-compat" } */

__extension__ struct S { int i; struct { int a; }; };
__extension__ _Noreturn void foo (void);
typedef int A;
__extension__ typedef int A;
__extension__ _Thread_local int i;
__extension__ _Static_assert (1, "foo");
__extension__ _Atomic int a;
__extension__ _Alignas (int) int aa;
enum e { E = __extension__ _Alignof (double) };

void
fn (int n)
{
  __extension__ _Generic (n, int: 0);
}