From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.devel Subject: Re: defvar without value Date: Thu, 02 Apr 2020 00:45:40 +0200 Message-ID: <878sjebzaj.fsf@web.de> References: <87k1302htp.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="107479"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Emacs Development To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Apr 02 00:48:46 2020 Return-path: Envelope-to: ged-emacs-devel@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 1jJmAA-000Rrz-BW for ged-emacs-devel@m.gmane-mx.org; Thu, 02 Apr 2020 00:48:46 +0200 Original-Received: from localhost ([::1]:38288 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jJmA8-00080w-RC for ged-emacs-devel@m.gmane-mx.org; Wed, 01 Apr 2020 18:48:45 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:58561) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jJm7G-0006oE-2k for emacs-devel@gnu.org; Wed, 01 Apr 2020 18:45:47 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jJm7F-0005YR-14 for emacs-devel@gnu.org; Wed, 01 Apr 2020 18:45:45 -0400 Original-Received: from mout.web.de ([217.72.192.78]:38145) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1jJm7E-0005Uu-KN for emacs-devel@gnu.org; Wed, 01 Apr 2020 18:45:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1585781140; bh=Q8dgw6WQ6eFO4wR4IXWtqHn8ECWsQvvry/EJXh7GWfo=; h=X-UI-Sender-Class:From:To:Cc:Subject:References:Date:In-Reply-To; b=UgSGLX36MsffM/734O6WGwDGgrYhy1Hr2oYXeMtddBAoOwbWSTwvpuk2wUXrACLZl eO5rCNjouKzFy8/IMj/4GYtfpGdsw4li+JxDsRVKiKQ0kvUG42LRxWq82NaEO5GpdY 6l4tpYEwuennBOHexwMfCTD8yiVUy8hVokZVhuAo= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Original-Received: from drachen.dragon ([188.98.99.7]) by smtp.web.de (mrweb103 [213.165.67.124]) with ESMTPSA (Nemesis) id 0LlniO-1ikiLT46Qy-00ZSnY; Thu, 02 Apr 2020 00:45:40 +0200 In-Reply-To: (Stefan Monnier's message of "Tue, 31 Mar 2020 20:59:17 -0400") X-Provags-ID: V03:K1:5kd8h+Ku8ggaAuT3w7RAta6AG128Hcto73A4qC4MSkWCN9+sklo Pk3JE+nSmHyRLvbdPu1LWS4WcfnFMZMtVg8hWA4ThOhTPGdoi1t3yW8BETb+26r7bqzlg4a 8pXco75pUcMJ5iRh/605p/Tb3o/QyZfULgpYSqJgsPS56hWt39EMcEtOnf+hBCvE9FYS5Fo DMG12jeYH84vjRW9LvkCA== X-UI-Out-Filterresults: notjunk:1;V03:K0:V+pBTdbKC94=:6XhxmYMzJOjdjTsvDDTMmm YVj3tHp9h3WwURy32nkvMmXyFr8RG98eDcyNU29SSjoSIpa2E/a3wWCmNgsMMiT/nK1RchvRX KUFeeCShxvu/gGZX6yArUixgnlyJ7Em5c6OR1+GfkuanaxjmPmlt/gSJEbXtgQlFpAItfunXz 1On4aWq5TwaKkEcqSMn3tp6L7PHgAOafmuwdlc6NxOIdbwj4TUko4SNTS1MChNXIt/wrqfodM 3KH82Q29JSea0cgHUJgRHuExemo/Jzq7yB9eboHYrv5HDfNgZ/rgLfO73PiCEImNF9tXUG7GJ HQzjga6My31/5tU5iI6nySfzRQr9nrD/Ngr0JYTAq0WPEUHVVVggEAZDhNlAat62pKi9lh6Ix uQcbSFeMBstKCLTVv0fjKLTcHeGaR059g+7plTp2pXNzHHsZlWP9gTtpmAWDVjqnCfgeUPAd7 ZcKzjaUeVlkXgsX1E96HSZU+SG/r0SROrCiXD6LWkNR9PXLeHxzmRdhKplkeS9+AXof36K884 8qSxfvAR3maQMAKYNyTCvhNYrZMWuQrALLZpMnAlnr2kAi5CxUOEfEvxAQsriFV0qAGyRRMDI qWUv1tyljhlQ8IFdP3gjIaxwM8tF6lLdW7s3Y2N+vYmzuCUsFI+eIsoLV1m6CS9YmkbNmfO+v iRyRH0ZSLU27sfQ+h67vnJHuB8UkZQKfi6DK7ZiEZL5++cHDvGwfwEzRsXtszeAkLUZ4Hnh6L pzTMnah+xSjzuyM4d5XR6vItoU3xaVd7rpqszxCQbEizTyZefUmoXht9Go4huOCF1pIHD9H1 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 217.72.192.78 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:246226 Archived-At: Stefan Monnier writes: > I guess we could add something like (defvar-dynamic VAR) which sets the > `special` bit on the variable, just like (defvar VAR VAL) does, but > leaves the variable's value unchanged (currently, you'd have to do > (progn (defvar VAR 'dummy) (makunbound 'VAR)) to get a similar > effect). Yes, I guess that would be nice... we/you/someone wanted to add `fluid-let' (i.e. a dynamically binding `let') anyway. I guess this can all be done at once. > Similarly, we could add something like (defvar-lexical VAR VAL) which > defines the var and sets it but doesn't set the `special` bit Uses of that exceed my current imagination. Ah, ok, following (top-level) defuns would become closures referencing the VAR automatically, right? Michael.