1  /* { dg-do run } */
       2  
       3  struct S1
       4  {
       5    int f1:1;
       6  };
       7  
       8  volatile struct S1 b = { 0 };
       9  
      10  int
      11  main ()
      12  {
      13    char c = b.f1;
      14    b.f1 = 1; 
      15  
      16    if (b.f1 > -1 || c)
      17      __builtin_abort (); 
      18  
      19    return 0; 
      20  }