GNU bug report logs - #23833
24.5; assoc-string with CASE-FOLD may fail

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Package: emacs;

Reported by: ynyaaa <at> gmail.com

Date: Thu, 23 Jun 2016 12:02:02 UTC

Severity: normal

Found in version 24.5

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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Message #16 received at 23833 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: ynyaaa <at> gmail.com, 23833 <at> debbugs.gnu.org
Subject: Re: bug#23833: 24.5; assoc-string with CASE-FOLD may fail
Date: Thu, 23 Jun 2016 11:53:00 -0400

On Thu, Jun 23, 2016 at 11:11 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:
>> From: Noam Postavsky <npostavs <at> users.sourceforge.net>
>> Date: Thu, 23 Jun 2016 08:26:22 -0400
>> Cc: 23833 <at> debbugs.gnu.org
>>
>> assoc-string uses compare-strings, which uses upcase to ignore case,
>> but upcase is not always the inverse of downcase:
>>
>> (upcase (downcase "DZ")) ;=> "Dz"
>> ;; Or to put it another way
>> (= (upcase (downcase ?\u01F1)) ?\u01F2) ;=> t
>>
>> Same behaviour seen in emacs-25 and master
>
> Thanks.
>
> This is a documentation issue: both 'assoc-string' and
> 'compare-strings' had inaccuracies in their doc strings.  I fixed this
> on the emacs-25 branch, and I'm marking this bug done.

Would it not make more sense if upcase converted dz into DZ? According
to https://en.wikipedia.org/wiki/Dz_(digraph)#Unicode Dz is the "title
case" form, not upper case form. Or is this something that depends on
locale?
This bug report was last modified 8 years and 336 days ago.

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