Subject: Re: SETF : Ambiguous? From: Erik Naggum <erik@naggum.net> Date: Thu, 22 Nov 2001 15:21:16 GMT Newsgroups: comp.lang.lisp Message-ID: <3215431275217808@naggum.net> * Rene_de_Visser@hotmail.com (Rene) | However I didn't see where the order of place and new value was defined in | the Hyperspec for SETF. There is nothing special about the evaluation order for setf. The standard Common Lisp evaluation order is strictly left to right. Any deviation from this is a serious bug. (let ((x (list 1 2 3))) (setf (cdr (progn (format t "First base!~&") x)) (progn (format t "Second base!~&") (list 3 5))) x) In a conforming Common Lisp implementation, this _must_ print First base! and Second base! in that order and return (1 3 5). /// -- Norway is now run by a priest from the fundamentalist Christian People's Party, the fifth largest party representing one eighth of the electorate. -- Carrying a Swiss Army pocket knife in Oslo, Norway, is a criminal offense.