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From: wagner@bnrmtv.UUCP
Newsgroups: comp.lang.lisp
Subject: scoping
Message-ID: <1481@bnrmtv.UUCP>
Date: Tue, 3-Mar-87 18:16:14 EST
Article-I.D.: bnrmtv.1481
Posted: Tue Mar  3 18:16:14 1987
Date-Received: Fri, 6-Mar-87 21:05:58 EST
Organization: Bell Northern Research, Mtn. View, CA
Lines: 23

ExperTelligence's common lisp produces a bug with the following
code.  I *believe* that it's a bug but the nuances of common lisp
scoping, extent, etc are sometimes confusing.  If anyone can
provide additional insight I would appreciate it.

;a function for summing the results of applying a function
;to each element of a list.

(defun sum (fn lst) 
   (apply #'+ (mapcar fn lst)))


;calls sum with a function which multiplies i by the argument (n)

(defun test (i)
   (sum #'(lambda (n) (* i n)) '(1 2 3)))

;call test with 2

(test 2) => error, i is bound to nil inside the unnamed lambda

It seems to me that i should be bound to 2.  Thanx in advance,
Mark Wagner @ BNR