From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Glenn Morris Newsgroups: gmane.emacs.bugs Subject: bug#25166: 26.0.50; It shouldn't be possible to set the function cell of nil and t Date: Mon, 12 Dec 2016 15:25:44 -0500 Message-ID: <1hpokwx5br.fsf@fencepost.gnu.org> References: <5f7f76ia4e.fsf@fencepost.gnu.org> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1481574373 9531 195.159.176.226 (12 Dec 2016 20:26:13 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 12 Dec 2016 20:26:13 +0000 (UTC) User-Agent: Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) Cc: 25166@debbugs.gnu.org To: Philipp Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Mon Dec 12 21:26:07 2016 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 1cGXAk-000125-Gx for geb-bug-gnu-emacs@m.gmane.org; Mon, 12 Dec 2016 21:26:06 +0100 Original-Received: from localhost ([::1]:33484 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cGXAn-0002Ct-7j for geb-bug-gnu-emacs@m.gmane.org; Mon, 12 Dec 2016 15:26:09 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:44539) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cGXAh-0002Cd-WE for bug-gnu-emacs@gnu.org; Mon, 12 Dec 2016 15:26:04 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cGXAg-0007KY-W9 for bug-gnu-emacs@gnu.org; Mon, 12 Dec 2016 15:26:03 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:52475) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1cGXAg-0007KO-Lx for bug-gnu-emacs@gnu.org; Mon, 12 Dec 2016 15:26:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1cGXAg-0007A9-EI for bug-gnu-emacs@gnu.org; Mon, 12 Dec 2016 15:26:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Glenn Morris Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 12 Dec 2016 20:26:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 25166 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 25166-submit@debbugs.gnu.org id=B25166.148157436027525 (code B ref 25166); Mon, 12 Dec 2016 20:26:02 +0000 Original-Received: (at 25166) by debbugs.gnu.org; 12 Dec 2016 20:26:00 +0000 Original-Received: from localhost ([127.0.0.1]:39641 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cGXAd-00079t-Sl for submit@debbugs.gnu.org; Mon, 12 Dec 2016 15:26:00 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:53529) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cGXAc-00079g-Bn for 25166@debbugs.gnu.org; Mon, 12 Dec 2016 15:25:58 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cGXAT-0007HJ-7e for 25166@debbugs.gnu.org; Mon, 12 Dec 2016 15:25:53 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:34377) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cGXAP-0007G6-Ip; Mon, 12 Dec 2016 15:25:45 -0500 Original-Received: from rgm by fencepost.gnu.org with local (Exim 4.82) (envelope-from ) id 1cGXAO-0007Y6-Uy; Mon, 12 Dec 2016 15:25:45 -0500 X-Spook: Agfa Venezuela class struggle AVN HAMASMOIS anthrax Dick X-Ran: GhlY9~qc,f;?M1~q^VBBj|DFY0$ie4dS7)/AR60LBmZ&]$"S&uIr/2"O&;%yFXv6<|cHd* X-Hue: black X-Attribution: GM In-Reply-To: <5f7f76ia4e.fsf@fencepost.gnu.org> (Glenn Morris's message of "Sun, 11 Dec 2016 13:38:57 -0500") X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] 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:126934 Archived-At: Glenn Morris wrote: > Philipp wrote: > >> You can set the function cell of nil and t using `fset' and friends. >> But you can't call the `nil' function using (nil) (it does work with >> (t)). I think that attempting to set the function cell of nil and t is >> almost always a bug -- probably the programmer wanted to set a real >> symbol, but some of the constants got passed. I propose to signal an >> error (e.g. `setting-constant') whenever the function cell of nil and t >> is modified; maybe the same should happen for keywords. > > I just did this yesterday... > See https://debbugs.gnu.org/25110, ba8e883, and 3fd4433. And now see also ffb1302. :) Anyway, I only did "nil", since as you say "t" can actually be called as a function. But you are right that it's probably unintended.