From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ulrich Mueller Newsgroups: gmane.emacs.devel Subject: Re: Lisp reader syntax and bootstrap Date: Fri, 14 Jul 2023 07:05:18 +0200 Message-ID: References: <83cz16k2kx.fsf@gnu.org> <833522jwvr.fsf@gnu.org> <87wmzdjk6l.fsf@yahoo.com> <219844d2-ca07-30f4-4e2c-1b1df76d0fa5@cs.ucla.edu> <83fs60hnj2.fsf@gnu.org> <83cz14guz3.fsf@gnu.org> <83pm52dbzh.fsf@gnu.org> <87y1jqwhhs.fsf@epfl.ch> <835y6uct1j.fsf@gnu.org> <878rbpe7a3.fsf@yahoo.com> <87y1jka126.fsf@yahoo.com> <5a110245-9b1c-be43-ca6e-2d37d3cac077@cs.ucla.edu> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6063"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.3 (gnu/linux) Cc: Po Lu , Richard Stallman , eliz@gnu.org, contovob@tcd.ie, emacs-devel@gnu.org To: Paul Eggert Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jul 14 07:06:57 2023 Return-path: Envelope-to: ged-emacs-devel@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 1qKB16-0001Oy-UG for ged-emacs-devel@m.gmane-mx.org; Fri, 14 Jul 2023 07:06:56 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qKB07-0000Fh-VP; Fri, 14 Jul 2023 01:05:56 -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 1qKAzq-0008T3-Dk for emacs-devel@gnu.org; Fri, 14 Jul 2023 01:05:42 -0400 Original-Received: from smtp.gentoo.org ([2001:470:ea4a:1:5054:ff:fec7:86e4]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_CHACHA20_POLY1305:256) (Exim 4.90_1) (envelope-from ) id 1qKAzo-00006e-CW; Fri, 14 Jul 2023 01:05:38 -0400 In-Reply-To: <5a110245-9b1c-be43-ca6e-2d37d3cac077@cs.ucla.edu> (Paul Eggert's message of "Thu, 13 Jul 2023 15:07:43 -0700") Received-SPF: pass client-ip=2001:470:ea4a:1:5054:ff:fec7:86e4; envelope-from=ulm@gentoo.org; helo=smtp.gentoo.org X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:307847 Archived-At: >>>>> On Fri, 14 Jul 2023, Paul Eggert wrote: > @@ -283,6 +279,12 @@ Float Basics > conversely, @code{(equal 0.0 -0.0)} returns @code{nil} whereas > @code{(= 0.0 -0.0)} returns @code{t}. > > + Infinities and NaNs are not available on legacy systems that lack > +IEEE floating-point arithmetic. On a circa 1980 VAX, for example, the > +Lisp reader approximates an infinity with the nearest finite value, "Nearest" sounds a little strange here. HUGE_VAL has still an infinite distance from infinity. Maybe some wording like "approximates positive and negative infinities with the largest and smallest representable finite numbers" would be more accurate? > +and a NaN with some other non-numeric Lisp object that provokes an > +error if used numerically.