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.help Subject: Re: Understanding the "let" construct and the setting of variables Date: Fri, 18 Dec 2020 10:16:02 +0100 Message-ID: <87h7oj325p.fsf@web.de> References: <87zh2d1byp.fsf@fastmail.fm> <87tusk2754.fsf@fastmail.fm> <3b1a7936-913a-4736-9b12-0d3e04333c74@default> <87czz8dpsd.fsf@web.de> <20201218090128.GA27014@tuxteam.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20995"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:ClbvYsPF4oFbvwIDFS7ikeLMBRQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Dec 18 10:16:54 2020 Return-path: Envelope-to: geh-help-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 1kqBsc-0005NP-6w for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 10:16:54 +0100 Original-Received: from localhost ([::1]:58558 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqBsb-0004YV-9k for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Dec 2020 04:16:53 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:58772) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqBrw-0004YN-HP for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 04:16:12 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:43880) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqBrt-0000GX-Pk for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 04:16:12 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kqBrs-0004TE-8c for help-gnu-emacs@gnu.org; Fri, 18 Dec 2020 10:16:08 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -13 X-Spam_score: -1.4 X-Spam_bar: - X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:126485 Archived-At: writes: > > > I would thing the variable has to be made somewhere. > > > In fact people talk about "unboundp". > > > > A variable can be unbound. Would be hard to call `boundp' with a > > variable that doesn't exist. > > But then, you don't call `boundp' on variables. You call it on > symbols. Yes, `boundp' is even lexical scoping agnostic, and (boundp t) ==> t, although `t' is not very...variable. > AFAIK (but I could be wrong, corrections welcome!) there's no explicit > notion of variable in Emacs Lisp, i.e. you cah't "have" a variable > object and manipulate it directly. > > That doesn't mean they don't exist -- I fancy them living in the grey > area between symbols and bindings. Well said. Regards, Michael.