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Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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From: Sean Whitton <spwhitton@HIDDEN>
Date: Fri, 18 Apr 2025 10:35:42 +0800
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Content preview: Hello, Found another case. *scratch* should probably remain
under the dynamic binding dialect of Emacs Lisp until and unless we switch
the default.
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Hello,
Found another case.
*scratch* should probably remain under the dynamic binding dialect of
Emacs Lisp until and unless we switch the default.
--
Sean Whitton
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Sean Whitton <spwhitton@HIDDEN> Subject: bug#77883: Acknowledgement (31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning) Message-ID: <handler.77883.B.174494378430683.ack <at> debbugs.gnu.org> References: <87a58erybl.fsf@HIDDEN> X-Gnu-PR-Message: ack 77883 X-Gnu-PR-Package: emacs Reply-To: 77883 <at> debbugs.gnu.org Date: Fri, 18 Apr 2025 02:37:10 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 77883 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 77883: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D77883 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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> From: Sean Whitton <spwhitton@HIDDEN>
> Date: Fri, 18 Apr 2025 10:35:42 +0800
>
> Found another case.
IMO, it's a bug, because "C-x C-e" doesn't generate any such warnings,
and lexical-binding is t in *scratch* anyway.
> *scratch* should probably remain under the dynamic binding dialect of
> Emacs Lisp until and unless we switch the default.
I think we intentionally decided to switch to t, and I don't see a
reason to revert that decision. Please provide a rationale for your
suggestion, because without that there's no way of reasoning about
this.
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Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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Eli Zaretskii <eliz@HIDDEN> writes:
> IMO, it's a bug, because "C-x C-e" doesn't generate any such warnings,
> and lexical-binding is t in *scratch* anyway.
I agree it is a bug.
C-c C-e calls `eval-buffer' which "ignores the current value of the
`lexical-binding' variable. Instead it will heed any
-*- lexical-binding: t -*- settings in the buffer, and if there is no such
setting, the buffer will be evaluated without lexical binding."
Not good in this case.
Michael.
X-Loop: help-debbugs@HIDDEN
Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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Hello,
On Fri 18 Apr 2025 at 01:49pm +03, Eli Zaretskii wrote:
>> From: Sean Whitton <spwhitton@HIDDEN>
>> Date: Fri, 18 Apr 2025 10:35:42 +0800
>>
>> Found another case.
>
> IMO, it's a bug, because "C-x C-e" doesn't generate any such warnings,
> and lexical-binding is t in *scratch* anyway.
Right.
>> *scratch* should probably remain under the dynamic binding dialect of
>> Emacs Lisp until and unless we switch the default.
>
> I think we intentionally decided to switch to t, and I don't see a
> reason to revert that decision.
Oh, me neither, I had forgotten/missed that discussion.
What I really meant is that we shouldn't be adding a lexical binding
cookie to the file.
--
Sean Whitton
X-Loop: help-debbugs@HIDDEN
Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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> From: Michael Heerdegen <michael_heerdegen@HIDDEN>
> Cc: Sean Whitton <spwhitton@HIDDEN>, Stefan Monnier
> <monnier@HIDDEN>, 77883 <at> debbugs.gnu.org
> Date: Fri, 18 Apr 2025 13:12:48 +0200
>
> Eli Zaretskii <eliz@HIDDEN> writes:
>
> > IMO, it's a bug, because "C-x C-e" doesn't generate any such warnings,
> > and lexical-binding is t in *scratch* anyway.
>
> I agree it is a bug.
>
> C-c C-e calls `eval-buffer' which "ignores the current value of the
> `lexical-binding' variable. Instead it will heed any
> -*- lexical-binding: t -*- settings in the buffer, and if there is no such
> setting, the buffer will be evaluated without lexical binding."
>
> Not good in this case.
Is it good in any other case?
I mean, what's the logic behind ignoring the current value of
lexical-binding, but heeding the cookie? let alone defaulting to
dynamic binding if there's no cookie? If the reason is backward
compatibility, I think I'd like to see the details: where would
changing this cause problems?
And note that this aspect of the eval-buffer's behavior is not
documented in the ELisp manual, which is also not a good thing.
X-Loop: help-debbugs@HIDDEN
Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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Eli Zaretskii <eliz@HIDDEN> writes:
> I mean, what's the logic behind ignoring the current value of
> lexical-binding, but heeding the cookie? let alone defaulting to
> dynamic binding if there's no cookie? If the reason is backward
> compatibility, I think I'd like to see the details: where would
> changing this cause problems?
>
> And note that this aspect of the eval-buffer's behavior is not
> documented in the ELisp manual, which is also not a good thing.
Indeed. This looks like an anachronism to me. But I would have to
investigate how the current situation evolved. Unless someone else
remembers...
Michael.
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Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:
> Indeed. This looks like an anachronism to me. But I would have to
> investigate how the current situation evolved. Unless someone else
> remembers...
See Bug#20139. That was quite a while ago (2019) and just documented
the status quo (and in the docstring only) at that point of time because
someone had been surprised by the behavior.
Looks like `eval-buffer' has just been completely forgotten in the
transition to making lexical binding the default.
Michael.
X-Loop: help-debbugs@HIDDEN
Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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>> C-c C-e calls `eval-buffer' which "ignores the current value of the
>> `lexical-binding' variable. Instead it will heed any
>> -*- lexical-binding: t -*- settings in the buffer, and if there is no such
>> setting, the buffer will be evaluated without lexical binding."
>>
>> Not good in this case.
>
> Is it good in any other case?
>
> I mean, what's the logic behind ignoring the current value of
> lexical-binding, but heeding the cookie? let alone defaulting to
> dynamic binding if there's no cookie? If the reason is backward
> compatibility, I think I'd like to see the details: where would
> changing this cause problems?
I can't remember how we ended up with this, but I strongly suspect it
has to do with the use of `eval-buffer` in `load-with-code-conversion`,
which is the most common use of `eval-buffer` (in dynamic counts, not
static counts, of course).
Stefan
X-Loop: help-debbugs@HIDDEN
Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: Michael Heerdegen <michael_heerdegen@HIDDEN>, spwhitton@HIDDEN,
> 77883 <at> debbugs.gnu.org
> Date: Fri, 18 Apr 2025 09:16:18 -0400
>
> >> C-c C-e calls `eval-buffer' which "ignores the current value of the
> >> `lexical-binding' variable. Instead it will heed any
> >> -*- lexical-binding: t -*- settings in the buffer, and if there is no such
> >> setting, the buffer will be evaluated without lexical binding."
> >>
> >> Not good in this case.
> >
> > Is it good in any other case?
> >
> > I mean, what's the logic behind ignoring the current value of
> > lexical-binding, but heeding the cookie? let alone defaulting to
> > dynamic binding if there's no cookie? If the reason is backward
> > compatibility, I think I'd like to see the details: where would
> > changing this cause problems?
>
> I can't remember how we ended up with this, but I strongly suspect it
> has to do with the use of `eval-buffer` in `load-with-code-conversion`,
> which is the most common use of `eval-buffer` (in dynamic counts, not
> static counts, of course).
If load-with-code-conversion is the only case where this is needed, we
could do that locally in load-with-code-conversion, right? I mean,
there's no need to "punish" all the users of eval-buffer for that
single use. Right?
X-Loop: help-debbugs@HIDDEN
Subject: bug#77883: 31.0.50; C-c C-e in *scratch* generates a missing lexical binding cookie warning
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From: Stefan Monnier <monnier@HIDDEN>
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> If load-with-code-conversion is the only case where this is needed, we
> could do that locally in load-with-code-conversion, right? I mean,
> there's no need to "punish" all the users of eval-buffer for that
> single use. Right?
I guess someone should look at the other uses of `eval-buffer` to figure
out if that's the case.
Another approach might be to check if `lexical-binding` is set
buffer-locally and if so to obey it without even checking the
`lexical-binding` cookie.
Stefan
Received: (at control) by debbugs.gnu.org; 2 May 2025 11:14:31 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri May 02 07:14:31 2025 Received: from localhost ([127.0.0.1]:56898 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1uAoLe-0000oJ-QA for submit <at> debbugs.gnu.org; Fri, 02 May 2025 07:14:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34764) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1uAoLZ-0000nk-1D; Fri, 02 May 2025 07:14:26 -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 1uAoLS-0005ac-Oz; Fri, 02 May 2025 07:14:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-version:References:Subject:In-Reply-To:To:From: Date; bh=KrSf0IHPPDecGV5k18ZlmEE/U5i/S8HcgD7TyLZlcIU=; b=U9fugUDhiRLgFQl64FDX POf6lJaGY/DtgNwRfpamdtLEcI9YXnklm5o4Mav8S1aLCAbJ0DmgD0eEA7fu7ic38O7HYsRhO1FoO VTAWjVzTUdd0hBqjnBorUVa6b1gRHuVUZiayOtRu8ZDcEX6dTT6NrmNztfV9uzKvwLcmWJjSEerEm Q1cH3/8X718GJifFT5ZAd5Nn0y/gxcgVGVHCGuJFA+XRIGTetR2AtkUYUHgDczQ+i+lCVFuHSHsO3 +AIdb7i8bl84H2tzB4rITsPn92fkuw9oLYPCEa9irGS/pjt/7FWICl4VPLyzMymMkkHAxslLF7/kS uoWZxsunQwNNog==; Date: Fri, 02 May 2025 14:14:00 +0300 Message-Id: <86tt63l0xz.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Andreas =?utf-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN> In-Reply-To: <49e0d597-5de9-412d-b7e2-acf3ce6b7a0b@HIDDEN> (message from Andreas =?utf-8?Q?R=C3=B6hler?= on Fri, 2 May 2025 11:33:02 +0200) Subject: Re: bug#78206: 31.0.50; false warning "Missing =?utf-8?Q?=E2=80=98lexical-binding=E2=80=99?= cookie" References: <49e0d597-5de9-412d-b7e2-acf3ce6b7a0b@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: control Cc: 78206 <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 (---) merge 78206 77883 thanks > Date: Fri, 2 May 2025 11:33:02 +0200 > From: Andreas Röhler <andreas.roehler@HIDDEN> > > When evaluating a narrowed part of buffer, get false "Warning (files): > Missing ‘lexical-binding’ cookie". > > Maybe check for something like > > (/= (buffer-size) (- (point-max) (point-min))) > > ? This is a "feature". See bug#77883.
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