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: Fri, 04 Nov 2022 15:33:21 +0100 Message-ID: <87o7tmg572.fsf@web.de> References: <87wn8dzh6o.fsf@web.de> <877d0d8g3e.fsf@web.de> <87zgd9ot4p.fsf@dataswamp.org> <87r0yk9tw6.fsf@web.de> <87o7toi68e.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="15596"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:I77ZPYcn73B64Moj7Xo9mXhA+Lw= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Nov 04 15:34:23 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 1oqxm2-0003j4-Rn for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 04 Nov 2022 15:34:22 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oqxlU-0000ip-SV; Fri, 04 Nov 2022 10:33:48 -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 1oqxlP-0000bS-P2 for help-gnu-emacs@gnu.org; Fri, 04 Nov 2022 10:33:45 -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 1oqxlE-0002qw-F7 for help-gnu-emacs@gnu.org; Fri, 04 Nov 2022 10:33:42 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1oqxlA-0002N3-Mv for help-gnu-emacs@gnu.org; Fri, 04 Nov 2022 15:33:28 +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=0.249, 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:140656 Archived-At: Emanuel Berg writes: > [...] because `quote' does not evaluate anything, not even > itself [...] I'm not so happy with this sentence, however. Not sure what you intended to say. Because, note that quotes (or quoted values, to be more precise) are _not_ self-quoting: evaluating a quoted value normally yields something different (i.e., the value, but not the quoted value). In that point `quote' is different from how `lambda' forms behave in dynamically binding Elisp ("self quoting"): (setq x '(lambda () 1)) ;; x -> (lambda nil 1) (eval x nil) ==> (lambda nil 1) (equal x (eval x nil)) ==> t but OTOH (setq x ''nil) ;; x -> 'nil (eval x nil) ==> nil, not 'nil (equal x (eval x nil)) ==> nil It is important to differentiate between forms and the results of evaluation of forms the make clear what one is meaning. Michael.