1  f (char *x)
       2  {
       3    *x = 'x';
       4  }
       5  
       6  main ()
       7  {
       8    int i;
       9    char x = '\0';
      10  
      11    for (i = 0; i < 100; ++i)
      12      {
      13        f (&x);
      14        if (*(const char *) &x != 'x')
      15  	abort ();
      16      }
      17    exit (0);
      18  }