Referencing NULL pointers

[Doug Gwyn]

In article <9838 at xanth.cs.odu.edu> kremer at cs.odu.edu (Lloyd Kremer) writes:
>	p = 0;  /* integer variable that happens to be set to zero */
>	data = *(int *)p;  /* no constant expression in this line */
>I would think the "promotion to nil pointer" rule would not apply here.

Correct, as Chris has already pointed out.  However I think there are
enough requirements imposed on converting between integers and pointers
that if you allow the above you'll also have to make the null pointer a
funny bit pattern, with resulting higher overhead than most people would
think necessary in that environment.  I don't have a formal proof though..