GNU bug report logs - #65797
`buffer-match-p` should not use `func-arity`

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Message #34 received at 65797 <at> debbugs.gnu.org (full text, mbox):

From: Joseph Turner <joseph <at> breatheoutbreathe.in>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 65797 <at> debbugs.gnu.org
Subject: Re: bug#65797: 29.0.92; func-arity should not return (0 . many) with apply-partially
Date: Fri, 08 Sep 2023 09:37:18 -0700

On September 8, 2023 8:52:25 AM PDT, Stefan Monnier <monnier <at> iro.umontreal.ca> wrote:
>>> This isn't backwards compatible, is it?
>> Neither is what you propose, AFAIU.  We are in effect changing a
>> public API in incompatible ways.
>
>Yup, AFAICT there's no way to implement the Texinfo-documented
>behavior reliably.
>
>So some backward-incompatibility is inevitable, unless we decide to
>stick to the current code to be "bug compatible" 

IIUC, the patch breaks code that passes a CONDITION predicate that accepts only one argument and also passes an ARG argument.

Is there another case which would break?

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