GNU bug report logs - #15059
24.3; nth with negative index values

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Package: emacs;

Reported by: Wilfred Hughes <wilfred <at> editd.com>

Date: Fri, 9 Aug 2013 11:57:01 UTC

Severity: minor

Tags: notabug, wontfix

Found in version 24.3

Done: Glenn Morris <rgm <at> gnu.org>

Bug is archived. No further changes may be made.

Full log

Message #17 received at 15059 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Wilfred Hughes <wilfred <at> editd.com>, 15059 <at> debbugs.gnu.org
Subject: Re: bug#15059: 24.3; nth with negative index values
Date: Fri, 09 Aug 2013 21:31:26 -0400

Stefan Monnier wrote:

>> Easy to raise an error (unless something was relying on the behaviour
>> for -ve arguments?):
>
> We could try.  But note that Emacs-19.34 already behaved like that (I
> don't have any older version at hand to test).  Not sure it's important
> to "fix".

Oh, the elisp manual actually documents the -ve argument case:

   -- Function: nth n list
  [...]
  If N is negative, `nth' returns the first element of LIST.
  [...]
  (nth -3 '(1 2 3 4))
               => 1

All hope is lost!
This bug report was last modified 11 years and 286 days ago.

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