From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: John Haman Newsgroups: gmane.emacs.help Subject: Morally equivalent Date: Sat, 15 Oct 2022 22:45:05 -0400 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8708"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.0 To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Oct 16 04:50:33 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 1ojtjU-0002Bk-Is for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 16 Oct 2022 04:50:32 +0200 Original-Received: from localhost ([::1]:44138 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ojtjT-0003OU-EX for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 15 Oct 2022 22:50:31 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51114) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ojtj4-0003O5-NG for help-gnu-emacs@gnu.org; Sat, 15 Oct 2022 22:50:06 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:55606) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ojtj3-0002xy-CU for help-gnu-emacs@gnu.org; Sat, 15 Oct 2022 22:50:06 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1ojtj0-0001ZK-GZ for help-gnu-emacs@gnu.org; Sun, 16 Oct 2022 04:50:02 +0200 X-Injected-Via-Gmane: http://gmane.org/ Content-Language: en-US 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: 7 X-Spam_score: 0.7 X-Spam_bar: / X-Spam_report: (0.7 / 5.0 requ) BAYES_00=-1.9, FORGED_MUA_MOZILLA=2.309, 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: , 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:139972 Archived-At: The documentation for push is > push is a Lisp macro in ‘subr.el’. > > (push NEWELT PLACE) > > Add NEWELT to the list stored in the generalized variable PLACE. > This is morally equivalent to (setf PLACE (cons NEWELT PLACE)), > except that PLACE is evaluated only once (after NEWELT). > > Other relevant functions are documented in the list group. > Probably introduced at or before Emacs version 21.1. What is a 'moral equivalence' in Emacs Lisp? -- Dr. John Haman Bethesda, MD