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From:     Date:
Date: Wed, 22 Nov 79 02:58:09 GMT
Original-Date: 11/21/79 22:58:09 EDT
    From: RMS at MIT-AI
    To:   (BUG LISP) at MIT-AI

    Why does SETF in Maclisp look for a SETF-X property instead of a SETF
    property like the one on the Lisp machine?
    It seems there is a gratuitous incompatibility born every minute.
Because the SETF-X property is not the same as the SETF property on the
LISP machine.  MacLisp's has additional stuff in it to allow PUSH and POP
(and similar things) to avoid multiple evaluation of the structure reference.
Usual user interface is kept simple through the DEFSETF macro.