1  struct A { int a; char b[]; };
       2  union B { struct A a; char b[sizeof (struct A) + 31]; };
       3  union B b = { { 1, "123456789012345678901234567890" } };
       4  union B c = { { 2, "123456789012345678901234567890" } };
       5  
       6  __attribute__((noinline, noclone)) void
       7  foo (int *x[2])
       8  {
       9    x[0] = &b.a.a;
      10    x[1] = &c.a.a;
      11  }
      12  
      13  int
      14  main ()
      15  {
      16    int *x[2];
      17    foo (x);
      18    if (*x[0] != 1 || *x[1] != 2)
      19      __builtin_abort ();
      20    return 0;
      21  }