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: named-let Date: Sat, 09 Jan 2021 13:43:44 -0500 Message-ID: References: <87im86kub6.fsf@logand.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="19805"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: Helmut Eller Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Jan 09 19:44:57 2021 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 1kyJEO-00051R-N7 for ged-emacs-devel@m.gmane-mx.org; Sat, 09 Jan 2021 19:44:56 +0100 Original-Received: from localhost ([::1]:42568 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kyJEN-0003wr-M0 for ged-emacs-devel@m.gmane-mx.org; Sat, 09 Jan 2021 13:44:55 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:54674) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kyJDL-0003Uq-DH for emacs-devel@gnu.org; Sat, 09 Jan 2021 13:43:51 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:2664) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kyJDJ-0004ln-AP for emacs-devel@gnu.org; Sat, 09 Jan 2021 13:43:50 -0500 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 83E1B805F3; Sat, 9 Jan 2021 13:43:47 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id A5A3A8064E; Sat, 9 Jan 2021 13:43:45 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1610217825; bh=sEENDI5jtDV/BIqWdMEhs1OBRgnImGzIBkTx5WYHbCM=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=YxZxhfKOyzAPAfPCCdv8E+bBs0+xGDvxr+IOPt6WEclsDPqRq5cjCl4o5g1KR2XoS 5K9fqrEtL8k76MYx0NDx0sC26MdYnUuqFDIBWQI7G8nCG5gVZ8t6aMmFIvdINHoxGD grIsiw0cYBQLIIF4OARVKcXwVFWPSUV1oW+5oKgIurPpJLG+FG1sG+I530dgButgJn 7Es+BKZnUWj00f0m4vradOfKDTGUJkBz8lApdet0Z3LP1OFXW3kOtl11Ae4c2fT9sd Gs4LyhLq3su00JiIXq3tGDjr0IWW2y6cZIwpMgKz4qQOBbfHNFPnB3s3KWKQZ1eg8q ECvE3lGjGBCUQ== Original-Received: from alfajor (unknown [45.72.224.181]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 733B8120409; Sat, 9 Jan 2021 13:43:45 -0500 (EST) In-Reply-To: (Helmut Eller's message of "Sat, 09 Jan 2021 18:03:54 +0100") 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 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.devel:262811 Archived-At: > Is there hope for general contification? So that things like > > (defun my-even? (x) > (cl-labels ((even? (x) (or (= x 0) (odd? (1- x)))) > (odd? (x) (or (= x 1) (even? (1- x))))) > (even? x))) > > are translated to a bunch of gotos and no lambdas. I have no plans to go there in the foreseeable future, but that shouldn't stop anyone else. I think an intermediate step would be to do it for code like (defun my-even? (x) (cl-labels ((even? (x) (let ((odd? (lambda (x) (or (= x 1) (even? (1- x)))))) (or (= x 0) (odd? (1- x)))))) (even? x))) but even that requires a fair bit more work than what I've just done, I think. Stefan