From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: phillip.lord@newcastle.ac.uk (Phillip Lord) Newsgroups: gmane.emacs.bugs Subject: bug#19208: replace-match unhelpful error message Date: Fri, 28 Nov 2014 17:00:15 +0000 Message-ID: <87r3wn5kgw.fsf@newcastle.ac.uk> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1417194180 23836 80.91.229.3 (28 Nov 2014 17:03:00 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 28 Nov 2014 17:03:00 +0000 (UTC) To: 19208@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Nov 28 18:02:53 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XuOwW-0005Gk-TV for geb-bug-gnu-emacs@m.gmane.org; Fri, 28 Nov 2014 18:02:53 +0100 Original-Received: from localhost ([::1]:45305 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XuOwV-0007na-TY for geb-bug-gnu-emacs@m.gmane.org; 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Fri, 28 Nov 2014 12:00:31 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XuOu2-0002Ns-BF for bug-gnu-emacs@gnu.org; Fri, 28 Nov 2014 12:00:24 -0500 Original-Received: from cheviot22.ncl.ac.uk ([128.240.234.22]:51141) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XuOu2-0002NR-6C for bug-gnu-emacs@gnu.org; Fri, 28 Nov 2014 12:00:18 -0500 Original-Received: from smtpauth-vm.ncl.ac.uk ([10.8.233.129] helo=smtpauth.ncl.ac.uk) by cheviot22.ncl.ac.uk with esmtp (Exim 4.63) (envelope-from ) id 1XuOu0-0000ga-DL for bug-gnu-emacs@gnu.org; Fri, 28 Nov 2014 17:00:16 +0000 Original-Received: from jangai.ncl.ac.uk ([10.66.67.223] helo=localhost) by smtpauth.ncl.ac.uk with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.63) (envelope-from ) id 1XuOu0-0005bm-0O for bug-gnu-emacs@gnu.org; Fri, 28 Nov 2014 17:00:16 +0000 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:96703 Archived-At: Occurs in Emacs 24.3 and trunk Running this code in *scratch* buffer (progn (goto-char (point-min)) (re-search-forward "This") (replace-match "That" nil nil nil)) Now undo and run this code (progn (goto-char (point-min)) (re-search-forward "This") (replace-match "That" nil nil nil 1)) This causes the following error. progn: Args out of range: -1, -1 The error is caused because I have asked for a subexp that doesn't exist in the regexp. A programmer error for sure, but the Args out of range error seems rather unfriendly to me, especially as I have no idea where the -1, or -1 has come from. "Attempt to replace regexp subexpression that doesn't exist", for example, would be nicer.