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: Calling a function with undefined symbol Date: Wed, 02 Nov 2022 17:40:37 +0100 Message-ID: <877d0d8g3e.fsf@web.de> References: <87wn8dzh6o.fsf@web.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="18231"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:THhg9YGkrwtMX9uT7JKR+AgR+cI= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Nov 02 17:41:30 2022 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 1oqGny-0004bK-GS for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 02 Nov 2022 17:41:30 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oqGnP-0004Xr-4p; Wed, 02 Nov 2022 12:40:55 -0400 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 1oqGnO-0004XE-7P for help-gnu-emacs@gnu.org; Wed, 02 Nov 2022 12:40:54 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oqGnJ-0001va-FE for help-gnu-emacs@gnu.org; Wed, 02 Nov 2022 12:40:50 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1oqGnF-0003li-QC for help-gnu-emacs@gnu.org; Wed, 02 Nov 2022 17:40:45 +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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FORGED_FROMDOMAIN=0.001, 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: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: "help-gnu-emacs" Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:140574 Archived-At: Sam Steingold writes: > > '''''''''''''''''''''''''''''''''... > > i.e., > > (defconst x #1=(quote #1#)) > > right? Yep. Or #1='#1#. What strange things we can have in Elisp! > > i.e. a value that is a quoted thing where the thing is the same value > > again (such a value exists in Elisp!) - what would evaluating > > > > (eq 'x x) > > (equal 'x x) > > nil: you are comparing a symbol 'x' with a circular list > (quote (quote ...)) > > what you probably meant was [...] No, I really meant what I wrote. It was intended as that simple question. Symbols are values in Elisp, expressions can eval to symbols. That's what Stefan was talking about. The exercise's goal was to recognize that `'x` evals to a symbol, which is something entirely different than adding another quote to that strange `'''....` value (which is not a symbol in any case). If you have understood that the first value is a symbol, it's easy to give the intended answers: two times "no". Michael.