1  int a, b, c, d, e, f;
       2  
       3  void
       4  fn1 ()
       5  {
       6    for (; e;)
       7      {
       8        e = f;
       9        for (; b;)
      10  	{
      11  	  b = a;
      12  	  f = a || d ? 0 : c;
      13  	}
      14        d = 0;
      15      }
      16  }