"Kirill M. Katsnelson" <kkm(a)kis.ru&gt; writes: Because that is not what that function is supposed to do. `copy-tree' copies conses, and even the VECP argument is a hack (it doesn't exist in Common Lisp). We could of course add a BIT-VECTORP argument, etc. but I don't see how that would be useful. -- Hrvoje Niksic <hniksic(a)srce.hr&gt; | Student at FER Zagreb, Croatia --------------------------------+-------------------------------- Try to use "ad nauseam" at least once per flame. It doesn't mean anything; but it gives that polished feel to your postings.