From unknown Fri Aug 15 20:26:16 2025 X-Loop: help-debbugs@gnu.org Subject: bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists Resent-From: Leo Liu Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 25 Sep 2014 04:07:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 18555 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: 18555@debbugs.gnu.org X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Received: via spool by submit@debbugs.gnu.org id=B.141161800030515 (code B ref -1); Thu, 25 Sep 2014 04:07:02 +0000 Received: (at submit) by debbugs.gnu.org; 25 Sep 2014 04:06:40 +0000 Received: from localhost ([127.0.0.1]:51482 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XX0KF-0007w7-QS for submit@debbugs.gnu.org; Thu, 25 Sep 2014 00:06:40 -0400 Received: from eggs.gnu.org ([208.118.235.92]:51526) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XX0KC-0007vw-W1 for submit@debbugs.gnu.org; Thu, 25 Sep 2014 00:06:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XX0K3-0005qy-JB for submit@debbugs.gnu.org; Thu, 25 Sep 2014 00:06:36 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=BAYES_40,FREEMAIL_FROM, T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:55599) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XX0K3-0005pr-GH for submit@debbugs.gnu.org; Thu, 25 Sep 2014 00:06:27 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53220) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XX0Jp-0003Fe-9r for bug-gnu-emacs@gnu.org; Thu, 25 Sep 2014 00:06:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XX0Jg-0005p1-9h for bug-gnu-emacs@gnu.org; Thu, 25 Sep 2014 00:06:13 -0400 Received: from mail-pd0-x235.google.com ([2607:f8b0:400e:c02::235]:35469) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XX0Jg-0005ol-1x for bug-gnu-emacs@gnu.org; Thu, 25 Sep 2014 00:06:04 -0400 Received: by mail-pd0-f181.google.com with SMTP id r10so9618685pdi.26 for ; Wed, 24 Sep 2014 21:05:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:subject:date:message-id:mime-version:content-type; bh=+8PsLpuwsC2EDiWnj3W6MwcgEahjwcepR4Cj/DleLdY=; b=qgxtsmR8NU0egR50O5P7DkTOYYPdzEvKWPf4GDTT8eDXedlgoKTdTAANfs2aqsv6Uk zD/vmtd41VYS+dQXKrK+EvSe6QU+VtxMFVRDjE4i+OJykaB9JNWFQOMqWUG+7cOq0QYk AnESDkefjn0XNwhoqmdjTMM+jbsVE9zUj4L9CStU7Wqj0xiCNoDO9NwCyixQdAc///pY xeoeTQr2jjTXqlgrN7QwuSP74u4fDKiLrZbVNlH40c+FW5L+AH/KS8F3i5U8UXD0X3Gk dcXr0CAROq83XdcwXV2XhfsBU8ymlv5NlF6awVVFeR9UYKh5lmvkdQTrolrvaMUMGD32 GbCQ== X-Received: by 10.66.66.163 with SMTP id g3mr14239292pat.150.1411617957905; Wed, 24 Sep 2014 21:05:57 -0700 (PDT) Received: from fortuna ([221.222.149.169]) by mx.google.com with ESMTPSA id ds14sm737509pdb.20.2014.09.24.21.05.55 for (version=TLSv1.1 cipher=RC4-SHA bits=128/128); Wed, 24 Sep 2014 21:05:57 -0700 (PDT) From: Leo Liu Date: Thu, 25 Sep 2014 12:05:49 +0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -4.0 (----) (nbutlast '(1 2 . 3)) throws an error due to `length' which can be fixed by using safe-length instead. (butlast '(1 2 . 3)) still throws an error due to copy-sequence not taking improper list. What is the right thing to do? Leo From unknown Fri Aug 15 20:26:16 2025 X-Loop: help-debbugs@gnu.org Subject: bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists Resent-From: Andreas Schwab Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 25 Sep 2014 07:22:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18555 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Leo Liu Cc: 18555@debbugs.gnu.org Received: via spool by 18555-submit@debbugs.gnu.org id=B18555.141162971517816 (code B ref 18555); Thu, 25 Sep 2014 07:22:02 +0000 Received: (at 18555) by debbugs.gnu.org; 25 Sep 2014 07:21:55 +0000 Received: from localhost ([127.0.0.1]:51543 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XX3NC-0004dH-S8 for submit@debbugs.gnu.org; Thu, 25 Sep 2014 03:21:55 -0400 Received: from cantor2.suse.de ([195.135.220.15]:37699 helo=mx2.suse.de) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XX3NA-0004d2-80 for 18555@debbugs.gnu.org; Thu, 25 Sep 2014 03:21:53 -0400 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 4F55BAD1B; Thu, 25 Sep 2014 07:21:51 +0000 (UTC) From: Andreas Schwab References: X-Yow: Is this BOISE?? Date: Thu, 25 Sep 2014 09:21:50 +0200 In-Reply-To: (Leo Liu's message of "Thu, 25 Sep 2014 12:05:49 +0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -5.7 (-----) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -5.7 (-----) Leo Liu writes: > (nbutlast '(1 2 . 3)) > > throws an error due to `length' which can be fixed > by using safe-length instead. > > (butlast '(1 2 . 3)) > > still throws an error due to copy-sequence not taking > improper list. > > What is the right thing to do? Don't do that then. Andreas. -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different." From unknown Fri Aug 15 20:26:16 2025 X-Loop: help-debbugs@gnu.org Subject: bug#18555: 24.4.50; butlast and nbutlast doesn't handle improper lists References: In-Reply-To: Resent-From: Stefan Kangas Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 30 Sep 2019 02:40:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18555 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Andreas Schwab Cc: 18555@debbugs.gnu.org, Leo Liu Received: via spool by 18555-submit@debbugs.gnu.org id=B18555.156981118718088 (code B ref 18555); Mon, 30 Sep 2019 02:40:01 +0000 Received: (at 18555) by debbugs.gnu.org; 30 Sep 2019 02:39:47 +0000 Received: from localhost ([127.0.0.1]:56386 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iElbH-0004hb-1e for submit@debbugs.gnu.org; Sun, 29 Sep 2019 22:39:47 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:37986) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iElbE-0004h2-Cc for 18555@debbugs.gnu.org; Sun, 29 Sep 2019 22:39:44 -0400 Received: by mail-pg1-f193.google.com with SMTP id x10so6522714pgi.5 for <18555@debbugs.gnu.org>; Sun, 29 Sep 2019 19:39:44 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=T8Jzt0JE70yCQO029TVcelLjmjdIZN+yjZg0z19+cVE=; b=EUWDsBpm+4YxUMMsAMdP22Ot80Y1n+3Pit4NvDzpywJzHfPdna5UZnuft/EksCKx8a uFtJRM/Ka0iT2ICSJm5c4+g+Xd/BHbCizSVkH9fTc1W+w09MxtRBbNUbGzcQakHlEA4h dC44Tz2ZVnQ6XhJbR6ZTeCa7OaFptazDNnn+fLD6+RoPT/vSr3A15CbNge2p4zK8olSD +Yrw3bUo26sCbvqakmNVLr+jfIJXHrK+sgtmcFc3sZ5JOSeQ1iLVHPY4RnSynZku1LGi 9Gr4yFzvMx9f2dgmUyqFRMFlAu7Qic5R/0TXncsSBHtAM3kxxgKfb3DLGO7tf2KBQa5t di5w== X-Gm-Message-State: APjAAAUHFZxopgs6sPt/vtk/7UXHPQc8J2sahdOCqczUcgBdhN3fYnyL XtC78/uwdW8Kcw9YYFgf1jaieYBkeRZaabjqj94= X-Google-Smtp-Source: APXvYqwsRNm8/mg4iRSdKUqvE+rCzyNb0h8/Q/o9k/FCslfDFB19ildKklNCmLtU2IWaAT/ewAqHUDEXjDdElDCfn/I= X-Received: by 2002:a63:720f:: with SMTP id n15mr21006233pgc.198.1569811178322; Sun, 29 Sep 2019 19:39:38 -0700 (PDT) MIME-Version: 1.0 From: Stefan Kangas Date: Mon, 30 Sep 2019 04:39:27 +0200 Message-ID: Content-Type: text/plain; charset="UTF-8" X-Spam-Score: 0.0 (/) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -1.0 (-) tags 18555 + notabug wontfix close 18555 quit Andreas Schwab writes: > Leo Liu writes: > >> (nbutlast '(1 2 . 3)) >> >> throws an error due to `length' which can be fixed >> by using safe-length instead. >> >> (butlast '(1 2 . 3)) >> >> still throws an error due to copy-sequence not taking >> improper list. >> >> What is the right thing to do? > > Don't do that then. Agreed. Both butlast and nbutlast are documented to work on lists, and throwing a malformed list at them should correctly signal an error. I'm therefore closing this bug report. Best regards, Stefan Kangas