1  /* { dg-do compile } */
       2  /* { dg-options "-std=gnu11 -Wc99-c11-compat" } */
       3  
       4  __extension__ struct S { int i; struct { int a; }; };
       5  __extension__ _Noreturn void foo (void);
       6  typedef int A;
       7  __extension__ typedef int A;
       8  __extension__ _Thread_local int i;
       9  __extension__ _Static_assert (1, "foo");
      10  __extension__ _Atomic int a;
      11  __extension__ _Alignas (int) int aa;
      12  enum e { E = __extension__ _Alignof (double) };
      13  
      14  void
      15  fn (int n)
      16  {
      17    __extension__ _Generic (n, int: 0);
      18  }