1  int v = 3;
       2  
       3  f ()
       4  {
       5    int v = 4;
       6    {
       7      extern int v;
       8      if (v != 3)
       9        abort ();
      10    }
      11  }
      12  
      13  main ()
      14  {
      15    f ();
      16    exit (0);
      17  }