1  /* PR tree-optimization/33136 */
       2  /* { dg-require-effective-target alloca } */
       3  
       4  extern void abort (void);
       5  
       6  struct S
       7  {
       8    struct S *a;
       9    int b;
      10  };
      11  
      12  int
      13  main (void)
      14  {
      15    struct S *s = (struct S *) 0, **p, *n;
      16    for (p = &s; *p; p = &(*p)->a);
      17    n = (struct S *) __builtin_alloca (sizeof (*n));
      18    n->a = *p;
      19    n->b = 1;
      20    *p = n;
      21  
      22    if (!s)
      23      abort ();
      24    return 0;
      25  }