Kent M Pitman  <pitman@world.std.com> wrote:
+---------------
| The simpler example would have been
|  (length (list (set! x 1)))
| since this uses the result for its objectness but not for any other
| aspect of itself.
+---------------

That's easy, (length (list (set! x 1))) ==> 1

And (list (set! x 1) (set! x 2)) ==> (#<void> #<void>)