1  struct VEC_char_base
       2  {
       3    unsigned num;
       4    unsigned alloc;
       5    union {
       6        short vec[1];
       7        struct {
       8  	  int i;
       9  	  int j;
      10  	  int k;
      11        } a;
      12    } u;
      13  };
      14  
      15  short __attribute__((noinline))
      16  foo (struct VEC_char_base *p, int i)
      17  {
      18    short *q;
      19    p->u.vec[i] = 0;
      20    q = &p->u.vec[16];
      21    *q = 1;
      22    return p->u.vec[i];
      23  }
      24  
      25  extern void abort (void);
      26  extern void *malloc (__SIZE_TYPE__);
      27  
      28  int
      29  main()
      30  {
      31    struct VEC_char_base *p = malloc (sizeof (struct VEC_char_base) + 256);
      32    if (foo (p, 16) != 1)
      33      abort ();
      34    return 0;
      35  }