From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Appending lists Date: Wed, 16 Jun 2021 11:31:19 -0400 Message-ID: References: <4tl1yvylvg1fxx5eefjs9mnk.1623688568572@email.android.com> <87o8c8l32h.fsf@posteo.net> <87zgvs2bup.fsf@zoho.eu> <87y2bby1kr.fsf@zoho.eu> <20210615091834.GB24886@tuxteam.de> <87im2ewr3k.fsf@zoho.eu> <20210616072819.GB17919@tuxteam.de> <20210616151101.GB5669@tuxteam.de> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="18963"; 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:BJ/xgpxtAxishb8IL35xyPzBdgo= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Wed Jun 16 17:33:42 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 1ltXXy-0004jq-2O for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 17:33:42 +0200 Original-Received: from localhost ([::1]:35970 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltXXx-00054c-2W for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 16 Jun 2021 11:33:41 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52262) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltXVz-0000oP-Cl for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 11:31:41 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:48648) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltXVp-0003Dn-M3 for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 11:31:33 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1ltXVn-0001z2-6i for help-gnu-emacs@gnu.org; Wed, 16 Jun 2021 17:31:27 +0200 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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, 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: 2.1.23 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:130907 Archived-At: tomas@tuxteam.de [2021-06-16 17:11:01] wrote: > On Wed, Jun 16, 2021 at 10:22:23AM -0400, Stefan Monnier via Users list for > the GNU Emacs text editor wrote: >> tomas@tuxteam.de [2021-06-16 09:28:19] wrote: >> > Doing (foo x y) will *never* change "the variable x" -- unless >> > foo is a macro/special form. >> >> Just to show that you should never say never: >> >> (let* ((x 5) >> (y 6)) >> (cl-flet ((foo (a b) (setq x (+ a b) y (* a b)) (- a b))) >> (list (foo x y) x y))) > > Hey, that's cheating :-) Impredicativity is borderline, indeed. Stefan