1  int a, b;
       2  
       3  void
       4  fn1 ()
       5  {
       6    for (;;)
       7      {
       8        for (b = 0; b < 3; b++)
       9  	{
      10  	  char e[2];
      11  	  char f = e[1];
      12  	  a ^= f ? 1 / f : 0;
      13  	}
      14      }
      15  }