1  /* Copyright (C) 2000 Free Software Foundation */
       2  /* by Alexandre Oliva  <aoliva@redhat.com> */
       3  
       4  enum foo { FOO, BAR };
       5  
       6  /* Even though the underlying type of an enum is unspecified, the type
       7     of enumeration constants is explicitly defined as int (6.4.4.3/2 in
       8     the C99 Standard).  Therefore, `i' must not be promoted to
       9     `unsigned' in the comparison below; we must exit the loop when it
      10     becomes negative. */
      11  
      12  int
      13  main ()
      14  {
      15    int i;
      16    for (i = BAR; i >= FOO; --i)
      17      if (i == -1)
      18        abort ();
      19  
      20    exit (0);
      21  }
      22