GNU bug report logs - #10337
cdr of `(cons #nil #nil)' is not nil

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

From: BT Templeton <bpt <at> hcoop.net>
To: bug-guile <at> gnu.org
Subject: cdr of `(cons #nil #nil)' is not nil
Date: Tue, 20 Dec 2011 22:49:58 -0500

I'm using Guile 2.0.3.87-b798 on x86_64-unknown-linux-gnu.

Guile's compiler fails to maintain the distinction between the nil
object and the empty list in some cases:

scheme@(guile-user)> (equal? (cons #t #nil) (cons #t '()))
$1 = #t
scheme@(guile-user)> (eq? (cdr (cons #t #nil)) (cdr (cons #t '())))
$2 = #t
scheme@(guile-user)> (compile '(cons #t #nil) #:from 'scheme #:to
  'tree-il)
$3 = #<tree-il (apply (toplevel cons) (const #t) (const #nil))>
scheme@(guile-user)> (compile '(cons #t #nil) #:from 'scheme #:to 'glil)
$4 = #<glil (program () (std-prelude 0 0 #f) (label :LCASE136) (const
  #t) (call list 1) (call return 1)>)

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