GNU bug report logs - #18555
24.4.50; butlast and nbutlast doesn't handle improper lists

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Package: emacs;

Reported by: Leo Liu <sdl.web <at> gmail.com>

Date: Thu, 25 Sep 2014 04:07:02 UTC

Severity: minor

Tags: notabug, wontfix

Found in version 24.4.50

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

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

From: Leo Liu <sdl.web <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.4.50; butlast and nbutlast doesn't handle improper lists
Date: Thu, 25 Sep 2014 12:05:49 +0800

  (nbutlast '(1 2 . 3))

throws an error due to `length' which can be fixed
by using safe-length instead.

  (butlast '(1 2 . 3))

still throws an error due to copy-sequence not taking
improper list.

What is the right thing to do?

Leo
This bug report was last modified 5 years and 293 days ago.

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