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Date: Fri, 03 Jul 2026 09:41:17 +0300
Message-Id: <867bncbmnm.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Filipp Gunbin <fgunbin@HIDDEN>
In-Reply-To: <m1jyrds40v.fsf@HIDDEN> (message from Filipp Gunbin on Thu,
02 Jul 2026 20:19:28 +0300)
Subject: Re: bug#81305: 32.0.50; [PATCH] end-of-defun off by 1 when given
negative argument less than -1
References: <m1echucqe8.fsf@HIDDEN> <86mrwhkf2n.fsf@HIDDEN>
<m18q81cya7.fsf@HIDDEN> <m1jyrds40v.fsf@HIDDEN>
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> From: Filipp Gunbin <fgunbin@HIDDEN>
> Cc: 81305 <at> debbugs.gnu.org, Stefan Monnier <monnier@HIDDEN>
> Date: Thu, 02 Jul 2026 20:19:28 +0300
>
> On 26/06/2026 14:54 +0300, Filipp Gunbin wrote:
>
> > On 26/06/2026 09:09 +0300, Eli Zaretskii wrote:
> >
> >>> From: Filipp Gunbin <fgunbin@HIDDEN>
> >>> Date: Thu, 25 Jun 2026 23:32:31 +0300
> >>>
> >>>
> >>> - emacs -Q
> >>>
> >>> - Create & visit file with this contents:
> >>>
> >>> --8<---------------cut here---------------start------------->8---
> >>> (defun foo()
> >>> )
> >>>
> >>> (defun bar()
> >>> )
> >>>
> >>> (defun baz()
> >>> )
> >>> ;;
> >>> -!-
> >>> --8<---------------cut here---------------end--------------->8---
> >>>
> >>> - Put point at EOB, as indicated
> >>>
> >>> - M--2 C-M-e
> >>>
> >>> - Instead of moving to the empty line between bar and baz, point moves
> >>> to the comment line.
> >>
> >> I think there's more here than meets the eye. With the following
> >> slightly-modified recipe:
> >>
> >> ----------------------------------------------------------------------
> >> (defun foo()
> >> )
> >>
> >> (defun bar()
> >> )
> >>
> >> (defun baz()
> >> )
> >> -!-;;
> >> ----------------------------------------------------------------------
> >>
> >> "C-u -2 C-M-e" works as expected. I think what triggers the
> >> difference in behavior is the fact that in your example there's some
> >> text between point and the end of previous defun.
> >>
> >
> > Exactly. Current code:
> >
> > ((< arg 0)
> > ;; Moving backward.
> > (if (< (point) pos)
> > ;; We already moved backward because we started from between
> > ;; two functions.
> > (setq arg (1+ arg))
> > ;; We started from inside a function.
> > (goto-char beg))
> >
> > already moves to beg when initial "beginning then end" movement didn't
> > make any progress ("else" branch). What I'm fixing is "then" branch,
> > where we count the progress made as 1, and then the process continues
> > from _end of defun_, not from its beginning, and we end up counting it
> > twice.
> >
> > I should have written in more explicitly.
>
> With the information I've given, can I install the patch on master?
I'd like to hear from Stefan first.
bug-gnu-emacs@HIDDEN:bug#81305; Package emacs.
Full text available.
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From: Filipp Gunbin <fgunbin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#81305: 32.0.50; [PATCH] end-of-defun off by 1 when given
negative argument less than -1
In-Reply-To: <m18q81cya7.fsf@HIDDEN>
References: <m1echucqe8.fsf@HIDDEN> <86mrwhkf2n.fsf@HIDDEN>
<m18q81cya7.fsf@HIDDEN>
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Date: Thu, 02 Jul 2026 20:19:28 +0300
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On 26/06/2026 14:54 +0300, Filipp Gunbin wrote:
> On 26/06/2026 09:09 +0300, Eli Zaretskii wrote:
>
>>> From: Filipp Gunbin <fgunbin@HIDDEN>
>>> Date: Thu, 25 Jun 2026 23:32:31 +0300
>>>
>>>
>>> - emacs -Q
>>>
>>> - Create & visit file with this contents:
>>>
>>> --8<---------------cut here---------------start------------->8---
>>> (defun foo()
>>> )
>>>
>>> (defun bar()
>>> )
>>>
>>> (defun baz()
>>> )
>>> ;;
>>> -!-
>>> --8<---------------cut here---------------end--------------->8---
>>>
>>> - Put point at EOB, as indicated
>>>
>>> - M--2 C-M-e
>>>
>>> - Instead of moving to the empty line between bar and baz, point moves
>>> to the comment line.
>>
>> I think there's more here than meets the eye. With the following
>> slightly-modified recipe:
>>
>> ----------------------------------------------------------------------
>> (defun foo()
>> )
>>
>> (defun bar()
>> )
>>
>> (defun baz()
>> )
>> -!-;;
>> ----------------------------------------------------------------------
>>
>> "C-u -2 C-M-e" works as expected. I think what triggers the
>> difference in behavior is the fact that in your example there's some
>> text between point and the end of previous defun.
>>
>
> Exactly. Current code:
>
> ((< arg 0)
> ;; Moving backward.
> (if (< (point) pos)
> ;; We already moved backward because we started from between
> ;; two functions.
> (setq arg (1+ arg))
> ;; We started from inside a function.
> (goto-char beg))
>
> already moves to beg when initial "beginning then end" movement didn't
> make any progress ("else" branch). What I'm fixing is "then" branch,
> where we count the progress made as 1, and then the process continues
> from _end of defun_, not from its beginning, and we end up counting it
> twice.
>
> I should have written in more explicitly.
With the information I've given, can I install the patch on master?
bug-gnu-emacs@HIDDEN:bug#81305; Package emacs.
Full text available.
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From: Filipp Gunbin <fgunbin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#81305: 32.0.50; [PATCH] end-of-defun off by 1 when given
negative argument less than -1
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On 26/06/2026 14:54 +0300, Filipp Gunbin wrote:
> I should have written in more explicitly.
^^ it
bug-gnu-emacs@HIDDEN:bug#81305; Package emacs.
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From: Filipp Gunbin <fgunbin@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#81305: 32.0.50; [PATCH] end-of-defun off by 1 when given
negative argument less than -1
In-Reply-To: <86mrwhkf2n.fsf@HIDDEN>
Organization: https://plainsoftware.org
References: <m1echucqe8.fsf@HIDDEN> <86mrwhkf2n.fsf@HIDDEN>
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On 26/06/2026 09:09 +0300, Eli Zaretskii wrote:
>> From: Filipp Gunbin <fgunbin@HIDDEN>
>> Date: Thu, 25 Jun 2026 23:32:31 +0300
>>
>>
>> - emacs -Q
>>
>> - Create & visit file with this contents:
>>
>> --8<---------------cut here---------------start------------->8---
>> (defun foo()
>> )
>>
>> (defun bar()
>> )
>>
>> (defun baz()
>> )
>> ;;
>> -!-
>> --8<---------------cut here---------------end--------------->8---
>>
>> - Put point at EOB, as indicated
>>
>> - M--2 C-M-e
>>
>> - Instead of moving to the empty line between bar and baz, point moves
>> to the comment line.
>
> I think there's more here than meets the eye. With the following
> slightly-modified recipe:
>
> ----------------------------------------------------------------------
> (defun foo()
> )
>
> (defun bar()
> )
>
> (defun baz()
> )
> -!-;;
> ----------------------------------------------------------------------
>
> "C-u -2 C-M-e" works as expected. I think what triggers the
> difference in behavior is the fact that in your example there's some
> text between point and the end of previous defun.
>
Exactly. Current code:
((< arg 0)
;; Moving backward.
(if (< (point) pos)
;; We already moved backward because we started from between
;; two functions.
(setq arg (1+ arg))
;; We started from inside a function.
(goto-char beg))
already moves to beg when initial "beginning then end" movement didn't
make any progress ("else" branch). What I'm fixing is "then" branch,
where we count the progress made as 1, and then the process continues
from _end of defun_, not from its beginning, and we end up counting it
twice.
I should have written in more explicitly.
bug-gnu-emacs@HIDDEN:bug#81305; Package emacs.
Full text available.Received: (at 81305) by debbugs.gnu.org; 26 Jun 2026 06:10:05 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Jun 26 02:10:05 2026 Received: from localhost ([127.0.0.1]:40904 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1wczlN-0003TY-7c for submit <at> debbugs.gnu.org; Fri, 26 Jun 2026 02:10:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35382) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1wczlK-0003Sc-Jp for 81305 <at> debbugs.gnu.org; Fri, 26 Jun 2026 02:10:04 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1wczlD-0007n0-N7; Fri, 26 Jun 2026 02:09:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=62bCBzD1a8ryAnqJIm9qyYOUWwqckOf5Nih9b+Fh1wg=; b=AQG2cCpa5ZrM 0ykhmJygAWwYzxpjXJHzNlcXCMbvV49xH6d3VKO0uWLxksLajj2eLF0gfX6HFiJR/kgdgsvlSI4Cb xuZ/mEw2q+AKb8nGo13HyKEmE6aGEcp+mGHz57rea95qByNJt73zrIzXaAXi2HJSSRSmsYNaHYkog lK9NEb+cvCAByyhnU4yxyRX19Hp436iBqQgaw24iRbLFNAYiIvNm/oui7u2XquS5X9/yFJd+lwJht 4sHqrHjIm5sKAbewPu9Wg+4wlkMEmgQ8xVwKBvBawgcTb2T3RtAr8vtJhaVNp4Ntl5ANTmIuV8w43 SbHXeJWjaoOfJwXaXwH+rA==; Date: Fri, 26 Jun 2026 09:09:52 +0300 Message-Id: <86mrwhkf2n.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Filipp Gunbin <fgunbin@HIDDEN>, Stefan Monnier <monnier@HIDDEN> In-Reply-To: <m1echucqe8.fsf@HIDDEN> (message from Filipp Gunbin on Thu, 25 Jun 2026 23:32:31 +0300) Subject: Re: bug#81305: 32.0.50; [PATCH] end-of-defun off by 1 when given negative argument less than -1 References: <m1echucqe8.fsf@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 81305 Cc: 81305 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > From: Filipp Gunbin <fgunbin@HIDDEN> > Date: Thu, 25 Jun 2026 23:32:31 +0300 > > > - emacs -Q > > - Create & visit file with this contents: > > --8<---------------cut here---------------start------------->8--- > (defun foo() > ) > > (defun bar() > ) > > (defun baz() > ) > ;; > -!- > --8<---------------cut here---------------end--------------->8--- > > - Put point at EOB, as indicated > > - M--2 C-M-e > > - Instead of moving to the empty line between bar and baz, point moves > to the comment line. I think there's more here than meets the eye. With the following slightly-modified recipe: ---------------------------------------------------------------------- (defun foo() ) (defun bar() ) (defun baz() ) -!-;; ---------------------------------------------------------------------- "C-u -2 C-M-e" works as expected. I think what triggers the difference in behavior is the fact that in your example there's some text between point and the end of previous defun. > Problem: in end-of-defun, we first move to the beginning of baz(), then > to its end. Point moved backwards, so we increment arg by 1, it's now > -1. But when we search further backwards for the beginning of defun, > we're still at the end of baz(), which we already counted. > > We should move to the beginning of baz first, but only when we indeed > intend to search further. The following patch does that, please review. Please explain the difference between the two examples above. Given you explanation, I cannot explain the difference, maybe because I'm confused reading it. Thanks.
bug-gnu-emacs@HIDDEN:bug#81305; Package emacs.
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From: Filipp Gunbin <fgunbin@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 32.0.50; [PATCH] end-of-defun off by 1 when given negative argument
less than -1
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Content preview: - emacs -Q - Create & visit file with this contents: --8<cut
herestart>8--- (defun foo() )
Content analysis details: (1.7 points, 10.0 required)
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- emacs -Q
- Create & visit file with this contents:
--8<---------------cut here---------------start------------->8---
(defun foo()
)
(defun bar()
)
(defun baz()
)
;;
-!-
--8<---------------cut here---------------end--------------->8---
- Put point at EOB, as indicated
- M--2 C-M-e
- Instead of moving to the empty line between bar and baz, point moves
to the comment line.
Problem: in end-of-defun, we first move to the beginning of baz(), then
to its end. Point moved backwards, so we increment arg by 1, it's now
-1. But when we search further backwards for the beginning of defun,
we're still at the end of baz(), which we already counted.
We should move to the beginning of baz first, but only when we indeed
intend to search further. The following patch does that, please review.
Thanks.
--8<---------------cut here---------------start------------->8---
diff --git a/lisp/emacs-lisp/lisp.el b/lisp/emacs-lisp/lisp.el
index 41c740912f7..1db2f5693b6 100644
--- a/lisp/emacs-lisp/lisp.el
+++ b/lisp/emacs-lisp/lisp.el
@@ -634,13 +634,12 @@ end-of-defun
(funcall end-of-defun-function))))
((< arg 0)
;; Moving backward.
- (if (< (point) pos)
- ;; We already moved backward because we started from between
- ;; two functions.
- (setq arg (1+ arg))
- ;; We started from inside a function.
- (goto-char beg))
+ (when (< (point) pos)
+ ;; We already moved backward because we started from between
+ ;; two functions.
+ (setq arg (1+ arg)))
(unless (zerop arg)
+ (goto-char beg)
(when (setq success (beginning-of-defun-raw (- arg)))
(setq beg (point))
(funcall end-of-defun-function)))))
diff --git a/test/lisp/emacs-lisp/lisp-tests.el b/test/lisp/emacs-lisp/lisp-tests.el
index 560fd436015..eb4b12b1ffb 100644
--- a/test/lisp/emacs-lisp/lisp-tests.el
+++ b/test/lisp/emacs-lisp/lisp-tests.el
@@ -403,10 +403,14 @@ end-of-defun-twice
\"docstring\"
body)
-;; end
+=!p3=;; end
"
(goto-char p1)
(end-of-defun 2)
+ (should (= (point) p2))
+ ;; Negative arg
+ (goto-char p3)
+ (end-of-defun -2)
(should (= (point) p2))))
;;; mark-defun
--8<---------------cut here---------------end--------------->8---
In GNU Emacs 32.0.50 (build 10, aarch64-apple-darwin25.5.0, NS
appkit-2685.60 Version 26.5.1 (Build 25F80)) of 2026-06-25 built on
mac2598okko
Repository revision: b66c995d5fb060b79bf866aa8d760ff0857ae32e
Repository branch: master
System Description: macOS 26.5.1
Filipp Gunbin <fgunbin@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#81305; Package emacs.
Full text available.
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