From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: [PATCH 1/2] Add new variable to force new-style backquote interpretation. Date: Sun, 31 Dec 2017 00:08:58 -0500 Message-ID: References: <20171229205929.23584-1-phst@google.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1514696846 9667 195.159.176.226 (31 Dec 2017 05:07:26 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sun, 31 Dec 2017 05:07:26 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sun Dec 31 06:07:22 2017 Return-path: Envelope-to: ged-emacs-devel@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 1eVVqC-0002An-QS for ged-emacs-devel@m.gmane.org; Sun, 31 Dec 2017 06:07:20 +0100 Original-Received: from localhost ([::1]:54077 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eVVsB-00007q-Mb for ged-emacs-devel@m.gmane.org; Sun, 31 Dec 2017 00:09:23 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35503) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eVVs5-00007P-It for emacs-devel@gnu.org; Sun, 31 Dec 2017 00:09:18 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eVVs0-0007fc-Jp for emacs-devel@gnu.org; Sun, 31 Dec 2017 00:09:17 -0500 Original-Received: from [195.159.176.226] (port=35095 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eVVs0-0007TB-CG for emacs-devel@gnu.org; Sun, 31 Dec 2017 00:09:12 -0500 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1eVVpw-000170-Ni for emacs-devel@gnu.org; Sun, 31 Dec 2017 06:07:04 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 20 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:g5tDApp9tdWrwzXx/VM0YxSGzWk= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:221482 Archived-At: >> > As discussed in >> > http://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00051.html, we >> > (mostly) agreed to first turn them into errors Still looks like a complete waste of time to me. I still haven't seen a single example of code which works in Emacs-25 (say) and fails in a byzantine manner if we silently drop support for old-style backquotes. OTOH we have already seen at least one example of code which works correctly in Emacs-25, works correctly if we drop support for old-style backquotes, and yet fails with this "in-between" support. So not only it's extra work for very little benefit (i.e. try and protect us from a hypothetical case no-one has ever seen in the wild) but it even costs us a known bug. Sorry, but the tradeoff really doesn't look good from here. Stefan