GNU bug report logs - #21855
eq?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Atticus <atticus0 <at> posteo.org>
To: bug-guile <at> gnu.org
Subject: eq?
Date: Sat, 07 Nov 2015 13:58:48 +0100

So I wanted to try out gnu guix and thus make myself more familiar with
guile first. While running some tests I encountered a problem/bug with eq?:

$ guile -v
guile (GNU Guile) 2.1.1

$ guile
scheme@(guile-user)>
(define (multirember a lat)
  (cond
   ((null? lat) '())
   ((eq? (car lat) a) (multirember a (cdr lat)))
   (else (cons (car lat) (multirember a (cdr lat))))))
   
scheme@(guile-user)> (multirember '(a b) '(x y (a b) z (a b)))
$1 = (x y z)

So why does guile return (x y z)? I expected (x y (a b) z (a b)). I know
eq? should only be used with symbols (and thus this example is more
theoretical) but nevertheless the return value is not right, since (eq?
'(a b) '(a b)) returns #f (Btw same in guile 2.0.11).

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