From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Code for cond* Date: Thu, 25 Jan 2024 11:05:16 -0500 Message-ID: References: <1AD5807F-91F7-4B92-BCB0-D0FEA904A75D@gmail.com> <67B51664-352E-4EB1-AE17-6D571999FDDE@gmail.com> <4B3E3A7E-677C-43A2-92B3-562E99A8B897@gmail.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="38050"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: JD Smith , enometh@meer.net, emacs-devel@gnu.org To: "Alfred M. Szmidt" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Jan 25 17:05:53 2024 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 1rT2Ej-0009cT-Jb for ged-emacs-devel@m.gmane-mx.org; Thu, 25 Jan 2024 17:05:53 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rT2EG-0005ID-Dm; Thu, 25 Jan 2024 11:05:24 -0500 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 1rT2EE-0005I4-Sh for emacs-devel@gnu.org; Thu, 25 Jan 2024 11:05:22 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rT2EC-00084Z-Vx; Thu, 25 Jan 2024 11:05:22 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id F1B1B4427E6; Thu, 25 Jan 2024 11:05:18 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1706198717; bh=KV2s0MYpQTzwZyguOCy1nnyznJOkFYg/P0g2LbaaA78=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=RrsFS6AHX1VUqPoFqszVnLtBcOq50+8JdHU0w1RmNCv2+GBaFfcOZRdqlzEdSW3CH uoUJBi0XxENhiH86+Atnq7XmqTdmzNUBYBZtqnlJBxLUTHjraJ+BMi6KgaaR+5IICG J+4viQobMLKIm4YdTGUT56MOOXFEm+ozP5QmztsTUp6TrPlBVC36dxuFEDC3MpKJdl lNJyAAE5wSaYKC8xDRpDfAnA97zT1J8xW9qFvjyZnZDaTbZl4G/ysI4CEXuGMd1H0d sLMgVppQn4hVP2Wr/ZSNbhUHpKSQYpw8Myy+4TSgfMuysYwUohcHDYCljCDUoqU7ND nq8ZUsCiex/NA== Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 24A474422F8; Thu, 25 Jan 2024 11:05:17 -0500 (EST) Original-Received: from pastel (unknown [45.72.206.68]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id EDA0412078A; Thu, 25 Jan 2024 11:05:16 -0500 (EST) In-Reply-To: (Alfred M. Szmidt's message of "Thu, 25 Jan 2024 10:44:52 -0500") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=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:315374 Archived-At: > (cond-let > (:let var-for-rest value) > > Is there a reason why using a keyword here? It was to "ensure" compatibility with existing `cond` code. Also it was based on the premise that most `cond`s would *not* use it since such code is mostly needed to replace things like: (let (val) (cond [...] ((foo (setq var (bar))) [...]) [...])) And while such code does occur, it occurs only in a minority of `cond` uses, so I thought it would be worthwhile for it to "stand out" so as not to catch the reader by surprise. Stefan