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SETF of an &REST list.
What you have to say is that SETF on the &REST list is not portable.
(defun foo (&rest l) (setf (car l) 'foo))
(defun test ()
(let ((x (list nil)))
(apply 'foo x)
In NIL (or Maclisp for that matter): (test) ==> NIL
In zetalisp its always been that: (test) ==> FOO.
This is also the kind of behavior that may be different depending
on if a function is interpreted or compiled or traced etc.