From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: What's the equivalent of `boundp' for lexical variables? Date: Fri, 26 Jan 2024 20:58:05 +0000 Message-ID: References: <87jznv4y50.fsf@igel.home> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="26797"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: Andreas Schwab Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jan 26 21:58:45 2024 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 1rTTHg-0006l4-6g for ged-emacs-devel@m.gmane-mx.org; Fri, 26 Jan 2024 21:58:44 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rTTHB-0003N5-RP; Fri, 26 Jan 2024 15:58:14 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rTTH9-0003Mr-JL for emacs-devel@gnu.org; Fri, 26 Jan 2024 15:58:11 -0500 Original-Received: from mail.muc.de ([193.149.48.3]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rTTH7-0003EY-IA for emacs-devel@gnu.org; Fri, 26 Jan 2024 15:58:11 -0500 Original-Received: (qmail 77242 invoked by uid 3782); 26 Jan 2024 21:58:06 +0100 Original-Received: from acm.muc.de (p4fe15689.dip0.t-ipconnect.de [79.225.86.137]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Fri, 26 Jan 2024 21:58:05 +0100 Original-Received: (qmail 10913 invoked by uid 1000); 26 Jan 2024 20:58:05 -0000 Content-Disposition: inline In-Reply-To: <87jznv4y50.fsf@igel.home> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.3; envelope-from=acm@muc.de; helo=mail.muc.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:315438 Archived-At: Hello, Andreas. On Fri, Jan 26, 2024 at 21:50:51 +0100, Andreas Schwab wrote: > On Jan 26 2024, Alan Mackenzie wrote: > > Is there such a facility for lexical variables, and if so what is it? > A lexical variable can never be unbound. A symbol might have a lexical binding, it might not. The problem is how to test which one of these applies. > -- > Andreas Schwab, schwab@linux-m68k.org > GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 > "And now for something completely different." -- Alan Mackenzie (Nuremberg, Germany).