From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#30078: 27.0.50; Use lexical-binding for M-: Date: Sat, 13 Jan 2018 13:05:58 -0500 Message-ID: References: <87h8rsaz8z.fsf@web.de> <838td32afg.fsf@gnu.org> <83373a3o0i.fsf@gnu.org> <83zi5i26bi.fsf@gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1515866714 25375 195.159.176.226 (13 Jan 2018 18:05:14 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 13 Jan 2018 18:05:14 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: michael_heerdegen@web.de, 30078@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Jan 13 19:05:10 2018 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eaQB3-0006EY-87 for geb-bug-gnu-emacs@m.gmane.org; Sat, 13 Jan 2018 19:05:09 +0100 Original-Received: from localhost ([::1]:54140 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eaQD2-0007NH-Ou for geb-bug-gnu-emacs@m.gmane.org; Sat, 13 Jan 2018 13:07:12 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:57913) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eaQCw-0007Mw-L2 for bug-gnu-emacs@gnu.org; Sat, 13 Jan 2018 13:07:07 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eaQCt-0008QL-Gu for bug-gnu-emacs@gnu.org; Sat, 13 Jan 2018 13:07:06 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:47191) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eaQCt-0008Pu-D1 for bug-gnu-emacs@gnu.org; Sat, 13 Jan 2018 13:07:03 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1eaQCr-00036C-Tt for bug-gnu-emacs@gnu.org; Sat, 13 Jan 2018 13:07:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 13 Jan 2018 18:07:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 30078 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 30078-submit@debbugs.gnu.org id=B30078.151586676411843 (code B ref 30078); Sat, 13 Jan 2018 18:07:01 +0000 Original-Received: (at 30078) by debbugs.gnu.org; 13 Jan 2018 18:06:04 +0000 Original-Received: from localhost ([127.0.0.1]:55088 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eaQBv-00034x-P9 for submit@debbugs.gnu.org; Sat, 13 Jan 2018 13:06:03 -0500 Original-Received: from pruche.dit.umontreal.ca ([132.204.246.22]:38848) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1eaQBt-00034X-2d for 30078@debbugs.gnu.org; Sat, 13 Jan 2018 13:06:01 -0500 Original-Received: from ceviche.home (lechon.iro.umontreal.ca [132.204.27.242]) by pruche.dit.umontreal.ca (8.14.7/8.14.1) with ESMTP id w0DI5wfO020076; Sat, 13 Jan 2018 13:05:58 -0500 Original-Received: by ceviche.home (Postfix, from userid 20848) id 10A126629F; Sat, 13 Jan 2018 13:05:58 -0500 (EST) In-Reply-To: <83zi5i26bi.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 12 Jan 2018 22:03:13 +0200") X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 2 Rules triggered EDT_SA_DN_PASS=0, RV6199=0 X-NAI-Spam-Version: 2.3.0.9418 : core <6199> : inlines <6310> : streams <1775958> : uri <2569769> X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:142125 Archived-At: >> No, they'll work pretty much as before. > Then you are saying that turning on lexical-binding in *scratch* will > change nothing at all? Not nothing at all, but the two languages are *very* similar and the differences rarely show up in a single expression. My gut feeling is that the main risk to bump into an undesirable behavior is something like (let ((foopkg-var t)) (foopkg-fun arg1 arg2)) where foopkg is not yet loaded and foopkg-fun is autoloaded: Emacs will only be told that `foopkg-var` is a dynamic-variable once the `foopkg-fun` call causes `foopkg` to be loaded, so Emacs will mistakenly use lexical scoping for the let binding because at that it still knows nothing about `foopkg-var`. Stefan