From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.devel Subject: Re: lexical-binding is turned on in more use cases Date: Wed, 11 Mar 2020 00:41:59 +0100 Message-ID: <87eetz4w1k.fsf@web.de> References: <83k13ubv3g.fsf@gnu.org> <83imjebsrh.fsf@gnu.org> <20200308193048.GB4832@ACM> <20200310191328.GB5046@ACM> <87lfo7q5e3.fsf@web.de> <20200310215334.GG5046@ACM> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="6063"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Eli Zaretskii , Stefan Monnier , emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Mar 11 00:44:41 2020 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 1jBoYD-0001Ta-Pp for ged-emacs-devel@m.gmane-mx.org; Wed, 11 Mar 2020 00:44:41 +0100 Original-Received: from localhost ([::1]:41886 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jBoYC-000578-LW for ged-emacs-devel@m.gmane-mx.org; Tue, 10 Mar 2020 19:44:40 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:45631) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jBoVg-0004JD-IA for emacs-devel@gnu.org; Tue, 10 Mar 2020 19:42:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jBoVf-0000Uy-FP for emacs-devel@gnu.org; Tue, 10 Mar 2020 19:42:04 -0400 Original-Received: from mout.web.de ([212.227.15.14]:38531) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1jBoVe-0000PD-DZ; Tue, 10 Mar 2020 19:42:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=web.de; s=dbaedf251592; t=1583883713; bh=oe47fajFHxdMgg53BCXkP1A/jIBcxBPlmtOgq6pCCO8=; h=X-UI-Sender-Class:From:To:Cc:Subject:References:Date:In-Reply-To; b=gvZ7Ykig707xSpVtDamsoMDx/XW8ZC5Cu/hLVIUMXbJGqvHMnY2ClJkjTP1ah+MKY XyHCpnKXYNYp/uoCdymUiEmSAmIxnTBfYVc2nduIR2JVs2fjrBE6IU6Jt5ULKlQDNL WC/EwBhCdYrRFip4fmP76QZ1By7GPcMtfR8jl/ss= X-UI-Sender-Class: c548c8c5-30a9-4db5-a2e7-cb6cb037b8f9 Original-Received: from drachen.dragon ([92.208.89.41]) by smtp.web.de (mrweb004 [213.165.67.108]) with ESMTPSA (Nemesis) id 0LePBV-1jfuTk0Rgb-00q8kz; Wed, 11 Mar 2020 00:41:53 +0100 In-Reply-To: <20200310215334.GG5046@ACM> (Alan Mackenzie's message of "Tue, 10 Mar 2020 21:53:34 +0000") X-Provags-ID: V03:K1:+2a59X2LlkrulSiPXJmLXtDum6EXqqroQZh6DPSXisBnOulZwJc sjYbWqFfxow/kNTGK+MyAdMUIHs+IpF/P2EVniss2OBiDmUhOZofKT2V4gMPzcBuoXUVXXp c/yAtqenJ9q5E1vBTjzXIA1sLn6tn7oalZVnSLAL+9/fYLgHdCUD6Q+ei78R/Pzn5/TWZ+q RBEUKTwY1oa4wsQ2YERQA== X-UI-Out-Filterresults: notjunk:1;V03:K0:NtU7YvTy5+A=:3jYkc9pNiGhCdD/8xqXBdn daNKyxf01+mFchNm6vpl54K3npmOfTwRVoBMPBU/VKYWgE4YqFebXtjcT3421u3xo9Di92yEj zE1OgWn0WPO6HMsG7uAVlP9zWU12qcCclZZh9Gm5EAGlJsDLeKwdPsBDlSlB6Oqrr9wrsMqXX o58Uj4rxnUQjUDEhCzchKWcGTQD5Z4dVD5YWXXTI/mFWwvWx9bdZL4U3jq/AJRj83kBkAN2yi YDZxo3tL7ciUBNt73+no+9U8lVxbnUqrVcwkU6CngxzUMSu4DHY1BPNrKxKlYnFNz/ru5uqUh yVGeWkOzUZODxe6ovos6owP42kVUXsTXqFXj/SZoW4boVZwoxpZ23c7BcNovFbLWVSM40BsGB B5P65ddSXU0pIZ9YFBN4wVxngml7jIJxQz/fkKCoRy6Hh+gDOOABq8Zrv+fWe+R9EIYeigpKe 5GkHxpyVAmjxtOGMszDZDjmZpu8J403ZZeL/Abd/8zMxzfu1BT1RSR8KqwX0mq157gWDNdTeL +isGjChULjlBBzFu6FfgfcBPGj13/etmOsFKYTQuYMlsTLBMaPel2WPRE3WKmSaZeQj/sf7c/ KSWgKyLVQtng2ZXIYH/DAh6Y/42HM1MVSywHbsyTN3acn37L+14PouOheRjTDTQOfuBVQyqcj LmN/K4H/Jl+EUkwVz560ritDKnbNwoaQGGVUoAWsp1xkTXUWL0h69as3jX/zm3utnp2LIDRAf zSk5Hem2Sdl4BC0635f3EVmykf9CERJXjg1TWjE8E9IfwtkuNR4XWh4iH2cTgBY5A5noAxI0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 212.227.15.14 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:245461 Archived-At: Alan Mackenzie writes: > Would you perhaps like to give me such an example? Well - anything that relies on lexical-binding. You can use any playground example, like (defun my-make-counter () (let ((counter 0)) (lambda () (setq counter (1+ counter))))) (setq mc (my-make-counter)) (funcall mc) => 1 (funcall mc) => 2 ; etc. If you eval (my-make-counter) with lexical-binding off, the result is not functional. If the expression to eval defines/binds something important, this will error or even break a package. > And I'm angry that such a far reaching change was pushed through without > open discussion beforehand on emacs-devel. This seems to happen far too > often in Emacs development. Were does M-: break for you with the change? > I have recently proposed that the lexicality of bindings created in M-: > (etc.) should be determined by a customisation variable, and have > offered to code it up. Would you find this a good solution? I guess not. AFAIU scratch has lexical binding on now, I think this is good. M-: used to use the lexical binding mode from the buffer it had been called. Dunno if an alternative would be to turn on lexical binding in more buffers instead. But my guess is that you will also not get lucky if you start to get in touch with code that relies on lexical binding (it gets more) and customize the new option to turn lexical binding off for evaluation. Michael.