From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: [External] : Re: Appending lists Date: Mon, 21 Jun 2021 02:30:00 +0300 Message-ID: References: <87r1gy3f70.fsf@zoho.eu> <20210619065703.GB29866@tuxteam.de> <87fsxdzgl9.fsf@zoho.eu> <87im28gvsx.fsf@zoho.eu> <87tulsfeuf.fsf@zoho.eu> <87pmwgfehh.fsf@zoho.eu> <87im28f8ot.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="3843"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon Jun 21 01:33:34 2021 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 1lv6wX-0000mB-NZ for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 21 Jun 2021 01:33:33 +0200 Original-Received: from localhost ([::1]:52658 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lv6wW-0007Pf-7T for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 20 Jun 2021 19:33:32 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55780) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lv6vw-0007PS-Sv for help-gnu-emacs@gnu.org; Sun, 20 Jun 2021 19:32:56 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:44857) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lv6vv-0002hW-B3 for help-gnu-emacs@gnu.org; Sun, 20 Jun 2021 19:32:56 -0400 Original-Received: from localhost ([::ffff:197.157.0.61]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 00000000000D9970.0000000060CFD024.00000405; Sun, 20 Jun 2021 16:32:52 -0700 Mail-Followup-To: help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: <87im28f8ot.fsf@zoho.eu> Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: 29 X-Spam_score: 2.9 X-Spam_bar: ++ X-Spam_report: (2.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_SBL_CSS=3.335, RCVD_IN_SORBS_WEB=1.5, SPF_HELO_PASS=-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:131124 Archived-At: * Emanuel Berg via Users list for the GNU Emacs text editor [2021-06-21 01:56]: > But here it did again, despite `copy-sequence'! > > (progn > (setq list-head '(1)) > (setq list-tail '(2 3 4)) > (setq list-tail-2 (copy-sequence list-tail)) > (setq whole-list (append list-head list-tail-2)) > (setcdr list-tail-2 '(3.5 4)) > whole-list > ) ; (1 2 3.5 4) Not like that, you have to use `copy-sequence' on the last element within `append' (progn (setq list-head '(1)) (setq list-tail '(2 3 4)) (setq whole-list (append list-head (copy-sequence list-tail))) (setcdr list-tail '(3.5 4)) whole-list ) ⇒ (1 2 3 4) -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/