1  /* { dg-do compile } */
       2  /* { dg-options "-std=gnu90 -pedantic -Wc99-c11-compat" } */
       3  
       4  struct S { int i; struct { int a; }; }; /* { dg-warning "ISO C90 doesn.t support unnamed structs/unions" } */
       5  _Noreturn void foo (void); /* { dg-warning "ISO C90 does not support ._Noreturn." } */
       6  typedef int A;
       7  typedef int A; /* { dg-warning "redefinition of typedef .A." } */
       8  _Thread_local int i; /* { dg-warning "ISO C90 does not support ._Thread_local." } */
       9  _Static_assert (1, "foo"); /* { dg-warning "ISO C90 does not support ._Static_assert." } */
      10  _Atomic int a; /* { dg-warning "ISO C90 does not support the ._Atomic. qualifier" } */
      11  _Alignas (int) int aa; /* { dg-warning "ISO C90 does not support ._Alignas." } */
      12  enum e { E = _Alignof (double) }; /* { dg-warning "ISO C90 does not support ._Alignof." } */
      13  
      14  void
      15  fn (int n)
      16  {
      17    _Generic (n, int: 0); /* { dg-warning "ISO C90 does not support ._Generic." } */
      18  }