1  static void *self(void *p){ return p; }
       2  
       3  int
       4  f()
       5  {
       6    struct { int i; } s, *sp;
       7    int *ip = &s.i;
       8  
       9    s.i = 1;
      10    sp = self(&s);
      11    
      12    *ip = 0;
      13    return sp->i+1;
      14  }
      15  
      16  main()
      17  {
      18    if (f () != 1)
      19      abort ();
      20    else
      21      exit (0);
      22  }