From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Newsgroups: gmane.emacs.help Subject: Re: Appending lists Date: Thu, 17 Jun 2021 09:50:13 +0200 Message-ID: <20210617075013.GE16310@tuxteam.de> References: <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> <875yydtnqz.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="u5E4XgoOPWr4PD9E" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="35948"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/1.5.21 (2010-09-15) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jun 17 09:50:55 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 1ltmne-00098j-Qz for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 17 Jun 2021 09:50:54 +0200 Original-Received: from localhost ([::1]:39766 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltmnd-0005Yd-Rg for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 17 Jun 2021 03:50:53 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36638) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltmn4-0005Ws-64 for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 03:50:18 -0400 Original-Received: from mail.tuxteam.de ([5.199.139.25]:35539) by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.90_1) (envelope-from ) id 1ltmn1-0004QV-GP for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 03:50:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=tuxteam.de; s=mail; h=From:In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:To:Date; bh=TvD0ybyfJIXQS3c05FL/452Fy+KoKa8TzJkbhMqs5AU=; b=lkmG358Q7cU6j5dIQgXtLlGqM6eAh9YC3QZ4P5SV3mJR8EuImmgBtAxt6BPR4vXcjiwaEctID3xHg2dakKf9zL3mVRTC2PQM5a5lS46SRuVnefBEl4hXzKVNq/7JZhiNBYo008zzzMRu3uojPkL0zUnrAzBOIFPw+SP85nzldMbnotaVoTlQkE0FYNzb02TtLpEof6ukKbfanDCI7aDo7nrsAeiOSADc1+nZPmE+pRUj8YC7z+jhI1DyRkgquRdeahHwFpeFEsKH2WhjjLWg4jy/bZZYwn+Yz8Czbi4kMdiumrcK7wnBkVblj19KD3eO7nwuqZFOXNtsAkj0IjkPYQ==; Original-Received: from tomas by mail.tuxteam.de with local (Exim 4.80) (envelope-from ) id 1ltmmz-0004yX-Qt for help-gnu-emacs@gnu.org; Thu, 17 Jun 2021 09:50:13 +0200 Content-Disposition: inline In-Reply-To: <875yydtnqz.fsf@zoho.eu> Received-SPF: pass client-ip=5.199.139.25; envelope-from=tomas@tuxteam.de; helo=mail.tuxteam.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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:130959 Archived-At: --u5E4XgoOPWr4PD9E Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jun 17, 2021 at 01:04:36AM +0200, Emanuel Berg via Users list for t= he GNU Emacs text editor wrote: > Stefan Monnier via Users list for the GNU Emacs text editor wrote: >=20 > >>>> Doing (foo x y) will *never* change "the variable x" -- unless > >>>> foo is a macro/special form. > >>>=20 > >>> Just to show that you should never say never: > >>>=20 > >>> (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. >=20 > Impredicativity, what's that, recursion? Kind of. But different [1] Cheers [1] https://en.wikipedia.org/wiki/Impredicativity - t --u5E4XgoOPWr4PD9E Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAmDK/rUACgkQBcgs9XrR2kYr8gCfbRyvyidv2gJYccU1IHttrNZi XCQAnjY/YixRBTHf2YhrFL40cHgUjngH =iBW6 -----END PGP SIGNATURE----- --u5E4XgoOPWr4PD9E--