From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#52290: 28.0.90; Undocumented generalized variables Date: Sun, 05 Dec 2021 03:52:43 +0100 Message-ID: <87ilw3u5j8.fsf@gnus.org> References: <5d87e4ab47875790076e932351fe8f25@webmail.orcon.net.nz> <87ilw3vnp7.fsf@gnus.org> <87bl1v4xxu.fsf@web.de> <87r1aru7xo.fsf@gnus.org> <87ee6rbxfb.fsf@web.de> 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="19440"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: Phil Sainty , 52290@debbugs.gnu.org, Stefan Monnier To: Michael Heerdegen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Dec 05 03:53:10 2021 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 1mtheI-0004oZ-Bx for geb-bug-gnu-emacs@m.gmane-mx.org; 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Original-Received: from [84.212.220.105] (helo=xo) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mthdv-0003Rj-0V; Sun, 05 Dec 2021 03:52:49 +0100 Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAABGdBTUEAALGPC/xhBQAAACBj SFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAAD1BMVEVTLCchERJtSTKQ UTX///9NncUgAAAAAWJLR0QEj2jZUQAAAAd0SU1FB+UMBQIrHveIKcYAAAFrSURBVDjLlZRtlsMg CEUBNwDpBhQ3kOr+9zaAxjid9Md4Thv1yoc8EgCUMRhhGwoD2B8gcGZE9oUAHGUYYJxg5OkBaII1 LlBPeSRwmX4OGIfwGxB8BO4OHwDDlxgB+AHE1Y4PU9/kEiBqhLMEvsIdBHPTmBbz+FrA/HGLUkux I4lvC66KMTHANwBOPcO0kN+gAc4YOyAmGMGpoGwxCIZQqlqUcg1gvklpaOsWGWyRbct+2hJMgEKQ RWyvn6q1p2xbM3H162rvZ6utU5tA/OGaAGWlhpxRLnB3x9RUIpGnfgCG/wEv/KPkHmoBDo1ucOAC 8AyGeHgD2YHbeWP+sbAd6xPum9cJUjadoAWYrxFFDHofLup+hyM7SCflBbb3wywSOfI570Dfpmbt 3qF4NfYECg48ma3BJZu8p7XcSvdKmvsb0tu+DEuxK8iraSqSVmXv8JhSwbrAdh+qRRbADVdrrAtE Qvb5iUWvBfoPZYFAcZyWubYAAAAldEVYdGRhdGU6Y3JlYXRlADIwMjEtMTItMDVUMDI6NDM6MzAr MDA6MDDFA5i6AAAAJXRFWHRkYXRlOm1vZGlmeQAyMDIxLTEyLTA1VDAyOjQzOjMwKzAwOjAwtF4g BgAAAABJRU5ErkJggg== X-Now-Playing: Pink Floyd's _Animals_: "Dogs" In-Reply-To: <87ee6rbxfb.fsf@web.de> (Michael Heerdegen's message of "Sun, 05 Dec 2021 03:25:12 +0100") 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" Xref: news.gmane.io gmane.emacs.bugs:221569 Archived-At: Michael Heerdegen writes: > I only wanted to note that some generalized vars might be more useful > with `cl-letf' than with plain setf, you get some extra kinds of > excursions gratis (sometimes doesn't work as expected though). Example: > > #+begin_src emacs-lisp > (cl-letf (((cons (point-min) (point-max)) > (cons (line-beginning-position) (line-end-position)))) > (recursive-edit)) > #+end_src That's... quote obscure. =F0=9F=98=80 Being able to say `(decf (point))' seems kinda nice, but I think even that is a bit on the obscure side. I.e., all the generalised variables that are used for side effect (as opposed to mutating an explicit object) are liable to cause confusion. --=20 (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no