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: Conditional binding and testing of `lexical-binding' Date: Sun, 02 Jan 2022 13:29:35 -0500 Message-ID: References: <874k6mjomk.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="13857"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: LdBeth , Drew Adams , "emacs-devel@gnu.org" To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Jan 02 19:31:27 2022 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 1n45df-0003T9-Eb for ged-emacs-devel@m.gmane-mx.org; Sun, 02 Jan 2022 19:31:27 +0100 Original-Received: from localhost ([::1]:43740 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n45de-0006K6-B5 for ged-emacs-devel@m.gmane-mx.org; Sun, 02 Jan 2022 13:31:26 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:53200) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n45bx-0005Ti-Ml for emacs-devel@gnu.org; Sun, 02 Jan 2022 13:29:42 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:49860) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n45bv-0002ff-Lv for emacs-devel@gnu.org; Sun, 02 Jan 2022 13:29:40 -0500 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 3C03F80602; Sun, 2 Jan 2022 13:29:38 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 00C86800AE; Sun, 2 Jan 2022 13:29:37 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1641148177; bh=1P13a0ES9e5JGaf2NUYAeBk7oM7WdbPmsrw3WxYnQ58=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=RIkpBUX8i12RHW8nhc9MCBBaK8pfV74eKYOdq1EKVD2Ez7DCDM2u4FARn1ZliqVZh AB53B6tAWrwBV3oa6vvlxzaDHVHcs1Ue0jOeJ1fBfyPdUvassBPdYQhFmfge0nR2X1 rtvj9gsTpa8ule20XfnRMN4zTonR2G2tYsgBV7WwB/O0Jj+Ut/t7MQCOot+L4ojEm0 UcO04/0IxMTSHOlypqpqO4qKc3pzT75SNC5NpKpsyIqor48PSPUhYLlW8wgUNhPh4t V+bGRXaGMWM1HOll6CIWaWlQr/TG6w5kpCgqvwbPDjU07u0H/NNkZrv4kxT+Ia0kqo KF6bWluefDy1w== Original-Received: from pastel (unknown [216.154.30.173]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id B4B33120218; Sun, 2 Jan 2022 13:29:36 -0500 (EST) In-Reply-To: <874k6mjomk.fsf@yahoo.com> (Po Lu's message of "Sun, 02 Jan 2022 20:41:55 +0800") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) 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=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" Xref: news.gmane.io gmane.emacs.devel:283946 Archived-At: > OTOH, I don't think there's much to be gained by using lexical binding > at all in code that's supposed to be compatible with versions of Emacs > without lexical binding. You get better byte-compiler warnings, and the native code generated from it is of higher quality, so it's likely to be marginally faster in such a build. Nothing ground breaking, admittedly. Stefan