GNU bug report logs - #63103
30.0.50; nconc compiler optimization breaks user packages

Previous Next

Package: emacs;

Reported by: Maks <mvproton <at> gmail.com>

Date: Thu, 27 Apr 2023 04:17:04 UTC

Severity: normal

Merged with 63100, 63101

Found in version 30.0.50

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

Full log

Message #27 received at 63103-done <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Daniel Mendler <mail <at> daniel-mendler.de>
Cc: Philip Kaludercic <philipk <at> posteo.net>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>, 63103-done <at> debbugs.gnu.org
Subject: Re: bug#63103: 30.0.50; nconc compiler optimization breaks user
 packages
Date: Thu, 27 Apr 2023 14:28:58 +0200

27 apr. 2023 kl. 12.42 skrev Daniel Mendler <mail <at> daniel-mendler.de>:

> I think it is
> kind of nice that `nconc' can be used as a tool to turn a proper list
> into an improper list and vice versa.

It's a bit obscure, though --

  (setcdr (last X) nil)

is a lot clearer than

  (nconc X nil)

and when the latter is preferred for performance, a comment might be polite to the reader.

Anyway, a fix has been pushed to master, and the manual entry for `nconc` got an extra example.
This bug report was last modified 2 years and 86 days ago.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.