From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: Code for cond* Date: Wed, 24 Jan 2024 13:34:22 +0000 Message-ID: <87cytqhn35.fsf@localhost> References: <874jf3rkzx.fsf@yahoo.com> <87le8ehqew.fsf@localhost> <87zfwurjv4.fsf@yahoo.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="40712"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Stefan Kangas , rms@gnu.org, joaotavora@gmail.com, acorallo@gnu.org, emacs-devel@gnu.org, monnier@iro.umontreal.ca, eliz@gnu.org To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jan 24 14:31:48 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 1rSdM3-000ANb-Dp for ged-emacs-devel@m.gmane-mx.org; Wed, 24 Jan 2024 14:31:47 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rSdLO-0004ag-LP; Wed, 24 Jan 2024 08:31:06 -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 1rSdLJ-0004Zv-8W for emacs-devel@gnu.org; Wed, 24 Jan 2024 08:31:02 -0500 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rSdLF-0000N9-Kc for emacs-devel@gnu.org; Wed, 24 Jan 2024 08:31:00 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 2880E240027 for ; Wed, 24 Jan 2024 14:30:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1706103054; bh=7E19sqtUS4Sg5strH48p9J4I1HXui43wfNfJWQmrbsg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type: From; b=kPTDEihnNTo6NEuhBX3PQ0eIE7H8wJkK7C2Mt/NO6DbeBUq6dTtW6OkFVYlgWz+fQ sEpRLm19TCnTqxo8Fry4nVh6gROKQV5qeagfHSl1LVQxFysQnCVTyUQxVEUWSJR/jN /C+dLd6zDwthIyDT4DLSi/KszK2YxtqftOTYb2F+h9MyOLnm6/ZzJWnShCx4oeHg9z EPidwedDb7fD/E9BxMc4+5LYKk+y3qEVn2GfKL7FnFDPPU3DEtv8Fp5y4kjrsWdIen /s7xD0F3BPH4JfGu4G4ti3ttUCshTk5VptuGisD6eixYjGc3PEnQVKecNHY5yPEMR5 QpbTiq7+PUl2Q== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4TKlG40zkqz9rxL; Wed, 24 Jan 2024 14:30:51 +0100 (CET) In-Reply-To: <87zfwurjv4.fsf@yahoo.com> Received-SPF: pass client-ip=185.67.36.65; envelope-from=yantar92@posteo.net; helo=mout01.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable 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:315303 Archived-At: Po Lu writes: >>> (let (x y z) >>> (cond ((eq (setq x ...) 'bar) >>> yyy) >>> ((setq y (... x)) >>> zzz) >>> ...and so on >>> >>> This alone is too important a feature to be consigned to ELPA. >> >> May you elaborate how cond* helps simplifying the above example? > > It will be possible for a clause to bind variables accessible in > subsequent ones, eliminating the let and setq forms. The problem is that cond* is doing much more than just introducing fall-through bindings. If we just need fall-through bindings, I'd argue that we should better introduce them separately; maybe even as a part of the normal `cond'. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at