GNU bug report logs - #47368
28.0.50; map-elt returns nil without "deprecated" TESTFN

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Message #35 received at 47368 <at> debbugs.gnu.org (full text, mbox):

From: "Basil L. Contovounesios" <contovob <at> tcd.ie>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, 47368 <at> debbugs.gnu.org,
 dalanicolai <dalanicolai <at> gmail.com>, Nicolas Petton <nico <at> petton.fr>
Subject: Re: bug#47368: 28.0.50; map-elt returns nil without "deprecated"
 TESTFN
Date: Fri, 26 Mar 2021 18:57:13 +0000

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> What's a good way to solve this?  Obviously the map abstraction doesn't
>> fit so super well for alists because unlike the other map type alists
>> don't know "their" test function.  But disallowing alists that don't
>> test with `eq' seems an unnecessary restriction.  Can we say that the
>> argument is allowed only for alists?
>
> How 'bout always using `equal`?

No objections here.  CCing Nicolas in case he has any comments.

Just some code archaeology for more context:

- Pre-Emacs-25 map-elt used assoc.
- Emacs 25 map-elt used alist-get without TESTFN.
- Emacs 26 map-elt gained TESTFN at the same time that alist-get did,
  in https://bugs.gnu.org/27584.
- Emacs 27 deprecated map-elt's TESTFN.

-- 
Basil

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