GNU bug report logs - #25929
25.2; map-delete doesn't delete permanently 1st alist elt

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Message #62 received at 25929 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, 25929 <at> debbugs.gnu.org,
 Nicolas Petton <nicolas <at> petton.fr>, Stefan Monnier <monnier <at> iro.umontreal.ca>,
 Tino Calancha <tino.calancha <at> gmail.com>
Subject: Re: bug#25929: 25.2;
 map-delete doesn't delete permanently 1st alist elt
Date: Wed, 22 Mar 2017 08:56:18 -0400

On Wed, Mar 22, 2017 at 8:01 AM, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:
> Michael Heerdegen <michael_heerdegen <at> web.de> writes:
>
>> That's a relatively small gain, and some people might prefer the
>> explicit form (2) for readability.
>
> If we don't do this, (map-delete foo 'bar) has surprising effects in
> this one corner case.
>
> That is, if foo is a hash table, then it's fine to say
> (map-delete foo 'bar).  If you change foo to be an alist, you then have
> to transform all the calls to be (setq foo (map-delete foo 'bar))
> instead,

It's also fine to say (setq foo (map-delete foo 'bar)) if foo is hash
table, right?

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