clos destructors

[jbk@world.std.com (Jeffrey B Kane)]

Something I can't find any reference to in the clos literature is a
destructor function.  For standard LISP objects I don't need it, since
GC takes care of this for me, but what if my objects contain Macintosh
records (or some other non-lisp data structure)?  I need to deallocate
such beasts before the object gets destroyed.
         Jeffrey