GNU bug report logs - #40972
27.0.91; assoc TESTFN's args reversed?

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Package: emacs;

Reported by: Shigeru Fukaya <shigeru.fukaya <at> gmail.com>

Date: Wed, 29 Apr 2020 21:16:02 UTC

Severity: minor

Tags: notabug, wontfix

Found in version 27.0.91

Done: Stefan Kangas <stefan <at> marxist.se>

Bug is archived. No further changes may be made.

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Message #8 received at 40972 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Shigeru Fukaya <shigeru.fukaya <at> gmail.com>
Cc: 40972 <at> debbugs.gnu.org
Subject: Re: bug#40972: 27.0.91; assoc TESTFN's args reversed?
Date: Thu, 30 Apr 2020 01:30:13 +0200

Shigeru Fukaya <shigeru.fukaya <at> gmail.com> writes:

> It seems to me, for third argument of `assoc', arguments are passed in a
> reverse order.
>
> (assoc "assoc" '(("cl-assoc" A) ("cl-member" B))
>        (lambda (x y) (equal (concat "cl-" x) y)))
> ==> nil
>
> (assoc "assoc" '(("cl-assoc" A) ("cl-member" B))
>        (lambda (y x) (equal (concat "cl-" x) y)))
> ==> ("cl-assoc" A)
>
> Or, is this intended behavior??

Dunno what others expect, but note that your predicate is not an
equality predicate (it's not symmetric), and the docstring doesn't
specify a behavior for this case.

Michael.
This bug report was last modified 4 years and 310 days ago.

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