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- To: (BUG LISP) at MIT-AI (LET ((COPY (CONS (CAR OLD) (CDR OLD)))) (RPLACA OLD 'DISPLACED) (RPLACD OLD (LIST COPY NEW))))
- From: RMS@MIT-AI
- Date: Thu, 16 Jun 78 03:28:50 GMT
- Original-date: 06/15/78 23:28:50 EDT
(DEFUN DISPLACED MACRO (FORM) (CADDR FORM))
This makes it easy to identify a displaced macro call
and find what the original code looked like.
Actually undoing the displacement is also easy.
But it is not much less efficient than the simpleminded displace.