From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.bugs Subject: bug#65209: 30.0.50; Unexpected behaviour of setq-local Date: Thu, 24 Aug 2023 03:06:32 +0200 Message-ID: <87pm3dnt9j.fsf@web.de> References: <87msyu2tmm.fsf@web.de> <80D7C281-C3DD-4DCA-9B14-1569E849CBC7@gmail.com> <87wmxqqq7d.fsf@web.de> <83350exl6h.fsf@gnu.org> <87wmxnojrb.fsf@web.de> <83msyjtkeo.fsf@gnu.org> <871qfu4dyx.fsf@web.de> <83fs4arnr1.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="13785"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: gerd.moellmann@gmail.com, eliz@gnu.org, monnier@iro.umontreal.ca To: 65209@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Aug 24 03:07:19 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qYyog-0003PD-Qg for geb-bug-gnu-emacs@m.gmane-mx.org; 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Thu, 24 Aug 2023 03:06:33 +0200 In-Reply-To: (Stefan Monnier via's message of "Wed, 23 Aug 2023 08:51:44 -0400") X-Provags-ID: V03:K1:4zfMBsfDu/9t6rdp41faijzx+jiVwTm5pjGdG7NaNJ8D/rK8Rgl umpzP8N/72dHs5T/SeHZWouliF6QG8m+XzvMeJbvM2ItWHunUdrelXmFwOZq0417D035vm1 Eq6WTDUM5ewYR+Wad5OrGr0znYZjwON6cXOK42FwkSg8y6unSGSmZb/jTWYb8Rb4FfavZkN gygP+Qa0suRhwrmCH27iw== UI-OutboundReport: notjunk:1;M01:P0:igpgHE546qA=;Phdaks10cOvztFs7+g1rN131V6X uizOWw4HIqmXAlX+WsADlQmYBP24jEo18Uatkrs/Mt6VF6tjRtz7xWPa+i/pz4UHXm+iv7Yeg C6RG3lIs8ZFmEEXydQz9wGGHRx7U3EHyZEfIXMedRu3+7j44491ZGt0JWHVYy3lRcmqEqcDUq /4tC0OYpBj+J4oufMjpKYzSnWyEVXiJNsdksJ/UBXSbY8OzQCNal3ICYuQUJXduLZM2LR/3Yl tkiar0HrNS5PfLx1uz6T8ByZ5DE47GXdNa2uLKpOjuYtCW2CqzlYeQZJJlgskwIj3GfnR5YyL wGxHvRVQbyRm40COXyUPjAYBbH+k2GAhQR1RXevoDYwYSyRrC3hGoO0ykFNlL0GAXUSphKOjM +qt2R6U88bwg61/LBhTGKkTww9X4xpRdhU0vAzkI1JS4f6gAqvXMz2XwRWqA1Wy0ghTSxWVJF Zx5l9jmeabFNmdNGZwcI0zXufUaqjppuai0zEWFJRkzEQxY6yFrIhAYB32EBfXzknV4kJz5Mn qbSXMyTBC+8FU2Ox/Wgh6vP9n3nHxMf3ZncEYYFKx7rY/SPNcbURSMWz59KIy7fVY3BahnlC+ 55jhkINHlf4++I7suCrmzcia/rVReg12/gwf6WWnECcLjvoY6rgupfgVJGnRzExfHjgTLSXS5 mT29DYTd0GT0xY3A9sF9A4oCmlvgR28by3ZXcexULhRGPFlSjTrNLUqxRdfykzAIZ9nWgHtON B/PoHUNE+BJV1GeifqTeuA1KGDg53wREt/s1TQzdnU5e/3H7bwLZxikrdnrBJyTML5P9zJP1 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:268288 Archived-At: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" writes: > A more corner case is: > > (defvar-local my-foo :default) > (with-temp-buffer > (let ((my-foo :global-let)) > (with-temp-buffer > (setq my-foo :set) > (list my-foo (with-temp-buffer my-foo))))) > > vs > > (defvar-local my-foo :default) > (with-temp-buffer > (let ((my-foo :global-let)) > (setq my-foo :set) > (list my-foo (with-temp-buffer my-foo)))) > > IIRC this is done purposefully (the code has to work harder to get this > semantics), but not really documented, and I can't offhand give you > a good reason for that semantics. Thanks for the example. (info "(elisp) Creating Buffer-Local") says about this case | Making a variable buffer-local within a =E2=80=98let=E2=80=99-binding for= that | variable does not work reliably, unless the buffer in which you do | this is not current either on entry to or exit from the =E2=80=98let=E2= =80=99. | This is because =E2=80=98let=E2=80=99 does not distinguish between differ= ent kinds | of bindings; it knows only which variable the binding was made for. I would really like to know a bit more than "doesn't work reliable". Such situations happen in real Emacs life. It's not always under the control of the user or the programmer which variables are currently let-bound when a buffer is created and buffer local variables might get set. "Anything can happen" leaves me with a very uneasy feeling. Michael.