# test pointers to records including forward refs

resource prec()

	type rt = rec (int a; ptr rt nxt);
	ptr rt rp

	# simple case
	rt k
	k.a = 14;
	rp = @k
	write(rp^.a);

	# array of pointers
	rt rlist[1:10]
	for [ i = 1 to 9 ] {
		rlist[i].a = i;
		rlist[i].nxt = @rlist[i+1];
	}
	rlist[10].a = 10;
	rlist[10].nxt = null;

	rp = @rlist[1];
	while (true) {
	    if (rp ~= null) {
		write(rp^.a)
		rp = rp^.nxt;
	    } else {
		write("NULL");
		exit;
	    }
	}

	# forward refs
	type pt2 = ptr t2
	pt2  p 
	ptr t2  q, r 

	type t1 = rec (int i; ptr t2 p)
	t1  r1 
	type t2 = rec (char c; ptr t1 p)
	ptr t2  s, t 

	t2 r2 = t2 ('!', @r1)
	r1 = t1 (491, @r2)
	p = r1.p
	write (r1.i, r1.p^.c)
	write (r2.p^.i, r2.c)
	write (p^.p^.i, p^.c)
	q = r = s = t = p
	write (r^.p^.i, q^.c)
	write (t^.p^.i, s^.c)
end