From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: =?UTF-8?Q?Re=3a_31395511=3a_=22Don=e2=80=99t_attempt_to_modify_cons?= =?UTF-8?Q?tant_strings=22?= Date: Thu, 4 Jun 2020 23:44:59 -0700 Organization: UCLA Computer Science Department Message-ID: <8ad00be2-c789-df59-92f9-35a3448d51fd@cs.ucla.edu> References: <871rmvn7ge.fsf@gmail.com> <87lfl36abx.fsf@gmail.com> <1abe5965-b48e-6dee-1516-c5c233f09d01@cs.ucla.edu> <87d06f5m2c.fsf@gmail.com> <87lfl3f5mj.fsf@tcd.ie> <87k10m4l5v.fsf@gmail.com> <8e691d13-8db0-2066-8725-ea8afab7c506@cs.ucla.edu> <94615cb2-9eda-7c1d-e55c-f89e007cac80@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="873"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 Cc: emacs-devel@gnu.org To: =?UTF-8?Q?Cl=c3=a9ment_Pit-Claudel?= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jun 05 08:45:43 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 1jh66o-000Y5O-SH for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Jun 2020 08:45:42 +0200 Original-Received: from localhost ([::1]:47224 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jh66n-0008Ct-V1 for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Jun 2020 02:45:41 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:50422) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jh66C-0007lB-Oo for emacs-devel@gnu.org; Fri, 05 Jun 2020 02:45:04 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:50022) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jh66B-0002c7-AG for emacs-devel@gnu.org; Fri, 05 Jun 2020 02:45:04 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 99B241600B5; Thu, 4 Jun 2020 23:45:00 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id WTDbPszmTb8z; Thu, 4 Jun 2020 23:44:59 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id D436D1600D1; Thu, 4 Jun 2020 23:44:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id bqcWgc9FByjf; Thu, 4 Jun 2020 23:44:59 -0700 (PDT) Original-Received: from [192.168.1.9] (cpe-23-242-74-103.socal.res.rr.com [23.242.74.103]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id AF8AD1600B5; Thu, 4 Jun 2020 23:44:59 -0700 (PDT) Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkV5QWNtUUJFQURB QXlIMnhvVHU3cHBHNUQzYThGTVpFb243NGRDdmM0K3ExWEEySjJ0QnkycHdhVHFmCmhweHhk R0E5Smo1MFVKM1BENGJTVUVnTjh0TFowc2FuNDdsNVhUQUZMaTI0NTZjaVNsNW04c0thSGxH ZHQ5WG0KQUF0bVhxZVpWSVlYL1VGUzk2ZkR6ZjR4aEVtbS95N0xiWUVQUWRVZHh1NDd4QTVL aFRZcDVibHRGM1dZRHoxWQpnZDdneDA3QXV3cDdpdzdlTnZub0RUQWxLQWw4S1lEWnpiRE5D UUdFYnBZM2VmWkl2UGRlSStGV1FONFcra2doCnkrUDZhdTZQcklJaFlyYWV1YTdYRGRiMkxT MWVuM1NzbUUzUWpxZlJxSS9BMnVlOEpNd3N2WGUvV0szOEV6czYKeDc0aVRhcUkzQUZINmls QWhEcXBNbmQvbXNTRVNORnQ3NkRpTzFaS1FNcjlhbVZQa25qZlBtSklTcWRoZ0IxRApsRWR3 MzRzUk9mNlY4bVp3MHhmcVQ2UEtFNDZMY0ZlZnpzMGtiZzRHT1JmOHZqRzJTZjF0azVlVThN Qml5Ti9iClowM2JLTmpOWU1wT0REUVF3dVA4NGtZTGtYMndCeHhNQWhCeHdiRFZadWR6eERa SjFDMlZYdWpDT0pWeHEya2wKakJNOUVUWXVVR3FkNzVBVzJMWHJMdzYrTXVJc0hGQVlBZ1Jy NytLY3dEZ0JBZndoU In-Reply-To: <94615cb2-9eda-7c1d-e55c-f89e007cac80@gmail.com> Content-Language: en-US Received-SPF: pass client-ip=131.179.128.68; envelope-from=eggert@cs.ucla.edu; helo=zimbra.cs.ucla.edu X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/05 02:45:00 X-ACL-Warn: Detected OS = Linux 3.1-3.10 X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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:251880 Archived-At: On 6/4/20 7:09 PM, Cl=C3=A9ment Pit-Claudel wrote: > On 04/06/2020 19.10, Paul Eggert wrote: >> I don't think this matters much, since string literals shouldn't have >> text properties. >=20 > Really? I've used the reader syntax for propertized strings a few times= =E2=80=94 it's pretty convenient. Oh, you're right. That's a special case for the same reason that the read= er syntax for ordinary string literals is a special case; these strings are = constants. In the implementation that I have in mind, reading the syntax for a prope= rtized string gives you a string constant, in that the interpreter signals an er= ror if you try to change the string's characters or its text properties slot - b= ut the implementation does not prevent you from using setcar or setcdr on the te= xt properties list. Perhaps some day later we can add further checking to pr= event that sort of funny business on string constants' properties, but one thin= g at a time. If memory serves, it wasn't that long ago that the Elisp interpreter prev= ented you from doing that sort of funny business on propertized string constant= s (at least when they were in pure space), but we've fallen back a bit on our r= untime checking.