From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Maks Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 04:17:04 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: 63103@debbugs.gnu.org X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Received: via spool by submit@debbugs.gnu.org id=B.168256898518551 (code B ref -1); Thu, 27 Apr 2023 04:17:04 +0000 Received: (at submit) by debbugs.gnu.org; 27 Apr 2023 04:16:25 +0000 Received: from localhost ([127.0.0.1]:57315 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prt3Q-0004p2-JQ for submit@debbugs.gnu.org; Thu, 27 Apr 2023 00:16:25 -0400 Received: from lists.gnu.org ([209.51.188.17]:59654) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prnyk-0003sk-28 for submit@debbugs.gnu.org; Wed, 26 Apr 2023 18:51:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prnyj-0002GR-P8 for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 18:51:13 -0400 Received: from mail-ej1-x632.google.com ([2a00:1450:4864:20::632]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1prnyi-00031o-2g for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 18:51:13 -0400 Received: by mail-ej1-x632.google.com with SMTP id a640c23a62f3a-94f7a7a3351so1477953366b.2 for ; Wed, 26 Apr 2023 15:51:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682549470; x=1685141470; h=mime-version:message-id:date:subject:to:from:from:to:cc:subject :date:message-id:reply-to; bh=Tq0XU/LFG0aak2vhXo8Zc3NF7eIIEIJ2osCnVSRAItM=; b=WR0zw8W389SpcRrxXUnrZ/nzp1q4BpeWLIqL/FteBxtnsODMzdooOh/1lcxjwVctR8 6bl/feJvm0SlH4t94MhnqzFJNc4odIO8DZvkZwennES7bf7SeHitavTzNsC7mXr5Juxd 0gLPWLNPqy2SWvOifzNo/iziG0Tw8N7wmJ0/c9SlvT82291jpORzP28/7MYGZLy5BQjS 5S/kXEKKRUGUZW/C1ewpYHE3oLpvyjtpaqEA9hN+mn57yHUkaREZvvyWIRg4IHAAk3O1 USf2TcqH7qcrkCI/AU0AizHfn0x9pxnsswCl8Jh9Nlb99X6vtz8Llh4DY7KWEuKhtIty hw/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682549470; x=1685141470; h=mime-version:message-id:date:subject:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Tq0XU/LFG0aak2vhXo8Zc3NF7eIIEIJ2osCnVSRAItM=; b=mHM6UjvXdz7P4b62gkZ5eypyunjZnYNlZrsxACT1WQYW6uL5fW5lFiQGzXxdnYr8q8 hP4XVywIZ9qAPjbCPqlk4x2dja5B4liyRnjPVL4vwRW03a99Cjyw6D2j4oxqGW+BreKl YFs01TbdxLXwQ6/WHz4IZqGpgsFsVviKHlnsvXkYxB3zaoK0JGIRwedSB/Q0aCdFGbRJ q9xW7EgYYD0HkXROTWrf84lYUCSBx5QIv4s0EYxqJBi26ZrVZlZvm43oXT6727BHJqZs FOInOR15OFY9PeBf2X3rCDwbWth5PRuM2LN1adjGrdwwSce/cO7gQQIXCDN/qlGw6hl8 eSdQ== X-Gm-Message-State: AAQBX9fMyZl0lZYqhc+ejvz2yFL6lkVc9eV7w5pzz3q7dkYibDfPQH+F 3MfcnrbLnGVC8W9Gc0yeket/mCeTQoQ= X-Google-Smtp-Source: AKy350YHzXddnrDAeSrdeKgdN81JLBqfLfsgex1TXIuEwdr6ndIruHcqXf8fKmwLwJOOs3Up5Fwncg== X-Received: by 2002:a17:906:4915:b0:94a:5d16:a280 with SMTP id b21-20020a170906491500b0094a5d16a280mr19024892ejq.9.1682549470323; Wed, 26 Apr 2023 15:51:10 -0700 (PDT) Received: from pop-os (78-152-187-146.pool.ic.km.ua. [78.152.187.146]) by smtp.gmail.com with ESMTPSA id mb20-20020a170906eb1400b0094f432f2429sm8782758ejb.109.2023.04.26.15.51.09 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Apr 2023 15:51:10 -0700 (PDT) From: Maks Date: Thu, 27 Apr 2023 01:50:42 +0300 Message-ID: <877cty45rx.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2a00:1450:4864:20::632; envelope-from=mvproton@gmail.com; helo=mail-ej1-x632.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Mailman-Approved-At: Thu, 27 Apr 2023 00:16:18 -0400 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: -2.3 (--) Hello, I'm sorry if you received similar emails from me, there were problems with sending. Commit e6ca5834a6eab91023e9f968b65683d0a74db1e7 ('Improved nconc and append compiler optimisations') breaks vertico.el package. After very long debugging time I figured out that this commit affects behavior of `completion-hilit-commonality` function of minibuffer.el. I don't completely understand how it works buf try do describe some details. If I set breakpoint before breaking commit to 'vertico--affixate then I'll get next stacktrace ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))))) vertico--arrange-candidates() vertico--exhibit() ... ``` buf if I do the same after breaking commit I'll get stacktrace ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))) . 0)) vertico--arrange-candidates() vertico--exhibit() ... ``` As you can see, the difference is in the tail of the list. With the such tail vertico.el package crashed with error: ``` Error in post-command-hook (vertico--exhibit): (wrong-type-argument listp 0) ``` But testing `completion-hilit-commonality` in REPL separetely from vertico.el package give the same result (with 0 at the end of list). Before sending this report I have tried a lot of versions of the vertico.el package and have the same result. So I tend to think that problem is not directly related to package. From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages References: <877cty45rx.fsf@gmail.com> In-Reply-To: <877cty45rx.fsf@gmail.com> Resent-From: Daniel Mendler Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 05:35:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: 63103@debbugs.gnu.org Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168257368927793 (code B ref 63103); Thu, 27 Apr 2023 05:35:02 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 05:34:49 +0000 Received: from localhost ([127.0.0.1]:57373 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pruHJ-0007EC-ED for submit@debbugs.gnu.org; Thu, 27 Apr 2023 01:34:49 -0400 Received: from server.qxqx.de ([178.63.65.180]:57665 helo=mail.qxqx.de) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pruHG-0007Du-5G for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 01:34:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=qxqx.de; s=mail1392553390; h=Content-Transfer-Encoding:Content-Type:Subject:From:To: MIME-Version:Date:Message-ID:Sender:Reply-To:Cc:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=5sDzyFLm534c3aHz9kumG10MsDQ/4ej9XqfP2wUfKzA=; b=ghUT+wotW+siNjKjTtbpoT0qvf HgB5XQWgdxLp2YGC4K7y53y7BTjpdQOx6uq8/XwpaL2MTG9DLDcT19WLaRWGVcuf8ZminLCqUhY5X 8tn6NgN50v9ztpCIkp188NClbwX81hihcd5G6KnSIpXs3HrOEa9xF6Zdhpmd0WvWUsuY=; Message-ID: Date: Thu, 27 Apr 2023 07:34:39 +0200 MIME-Version: 1.0 Content-Language: en-US From: Daniel Mendler Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -2.3 (--) 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: -3.3 (---) The problem is that `(nconc list nil)` is optimized to `list`. However improper lists like `(a b c . 0)` should be turned into `(a b c)`. Daniel From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Philip Kaludercic Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 05:45:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Daniel Mendler Cc: 63103@debbugs.gnu.org Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168257424328846 (code B ref 63103); Thu, 27 Apr 2023 05:45:01 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 05:44:03 +0000 Received: from localhost ([127.0.0.1]:57395 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pruQE-0007VB-PR for submit@debbugs.gnu.org; Thu, 27 Apr 2023 01:44:03 -0400 Received: from mout01.posteo.de ([185.67.36.65]:42207) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pruQA-0007UP-7u for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 01:44:00 -0400 Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 756B324026D for <63103@debbugs.gnu.org>; Thu, 27 Apr 2023 07:43:51 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1682574231; bh=EHc6RmEXW7YVbYnhd0TVqPW6pWBd5uCxFa2tvp7NltQ=; h=From:To:Cc:Subject:Autocrypt:Date:From; b=H2T79m+/JK1KchGS2YwovqeYKhRy0eKLw1ehz9xFcICxZl3lr0L1l+C+sqCQcl5KP ea95IYRsN9nCwTHtvIF8PTNdwwblxVzo75mrsegYhaGxGKYLnLXM1Oc7TgdJvsFN2k UVYkOmstex/7GdXHN9pDCjoCxvdui97vRB/zwDJQLMixO/EYMBpD/MJFkdQy1tuOiJ 2N9FPw5ASZORc2JaLaFIEY4v9hJv2ncW9NY7HhUkfsuWKqRCZYH9yAIllEuEQ62FpU tXGaPGKnWP40Luz1k46hfj6ueR/LEbt3E/T3WOTGh0XelM1wFi1mj81Ar4DX5Fl74C XkGa7OXUZPzoA== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4Q6Pml13ykz6tn4; Thu, 27 Apr 2023 07:43:51 +0200 (CEST) From: Philip Kaludercic In-Reply-To: (Daniel Mendler's message of "Thu, 27 Apr 2023 07:34:39 +0200") References: <877cty45rx.fsf@gmail.com> Autocrypt: addr=philipk@posteo.net; keydata= mDMEZBBQQhYJKwYBBAHaRw8BAQdAHJuofBrfqFh12uQu0Yi7mrl525F28eTmwUDflFNmdui0QlBo aWxpcCBLYWx1ZGVyY2ljIChnZW5lcmF0ZWQgYnkgYXV0b2NyeXB0LmVsKSA8cGhpbGlwa0Bwb3N0 ZW8ubmV0PoiWBBMWCAA+FiEEDg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwMFCQHhM4AFCwkI BwIGFQoJCAsCBBYCAwECHgECF4AACgkQ8xYDWXahwulikAEA77hloUiSrXgFkUVJhlKBpLCHUjA0 mWZ9j9w5d08+jVwBAK6c4iGP7j+/PhbkxaEKa4V3MzIl7zJkcNNjHCXmvFcEuDgEZBBQQhIKKwYB BAGXVQEFAQEHQI5NLiLRjZy3OfSt1dhCmFyn+fN/QKELUYQetiaoe+MMAwEIB4h+BBgWCAAmFiEE Dg7HY17ghYlni8XN8xYDWXahwukFAmQQUEICGwwFCQHhM4AACgkQ8xYDWXahwukm+wEA8cml4JpK NeAu65rg+auKrPOP6TP/4YWRCTIvuYDm0joBALw98AMz7/qMHvSCeU/hw9PL6u6R2EScxtpKnWof z4oM Date: Thu, 27 Apr 2023 05:44:24 +0000 Message-ID: <871qk5516v.fsf@posteo.net> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: -2.3 (--) 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: -3.3 (---) Daniel Mendler writes: > The problem is that `(nconc list nil)` is optimized to `list`. However > improper lists like `(a b c . 0)` should be turned into `(a b c)`. Where is this behaviour documented? > Daniel From debbugs-submit-bounces@debbugs.gnu.org Thu Apr 27 01:47:39 2023 Received: (at control) by debbugs.gnu.org; 27 Apr 2023 05:47:40 +0000 Received: from localhost ([127.0.0.1]:57405 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pruTj-0007bo-Jr for submit@debbugs.gnu.org; Thu, 27 Apr 2023 01:47:39 -0400 Received: from eggs.gnu.org ([209.51.188.92]:58380) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pruTh-0007b9-PS for control@debbugs.gnu.org; Thu, 27 Apr 2023 01:47:38 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pruTa-0008AM-QJ for control@debbugs.gnu.org; Thu, 27 Apr 2023 01:47:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=BSWqc/cbEZXkrtijckfJ3J6NGdJEni1N2bouozHYqXo=; b=Oz9+p/mn8L4s W5q5MjtVbpKVv1CauzQutbVPYnJKEvTkj1AFQYMe1lDTHUOU+TP+PlNpaNA2Zsd297+zC8sEOwGr4 uioXt0ICuQltc7hVFHCxf6U21o3hzp5EN014MNqhWsNnYMix5cnG5PZLPnVouwhE1uWJQYF3jR6jl 14qS9YbGrmKOoxdNP/F+H4kyt5SMcb/I73BfpazUqccjsLXEXo1+BkFVrmSq6Lp3lCqR9oC3sFPjT ZzOgpayDj4LrN+w54OW74NM61iUdy5zQltoRy+JNhS62Or+pe60q8dVkufSGbUtQW6qYRQXEGqs15 Y8yJgOE/ABxQZvilCcbr9g==; Received: from [87.69.77.57] (helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pruTZ-000743-5W for control@debbugs.gnu.org; Thu, 27 Apr 2023 01:47:30 -0400 Date: Thu, 27 Apr 2023 08:48:01 +0300 Message-Id: <835y9hub8u.fsf@gnu.org> From: Eli Zaretskii To: control@debbugs.gnu.org In-Reply-To: <87o7na8wly.fsf@gmail.com> (message from Maks on Wed, 26 Apr 2023 18:57:29 +0300) Subject: Re: bug#63101: 30.0.50; nconc compiler optimization breaks user packages References: <87o7na8wly.fsf@gmail.com> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: control 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: -3.3 (---) merge 63101 63103 63100 thanks From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Daniel Mendler Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 06:38:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Philip Kaludercic Cc: mattiase@acm.org, Stefan Monnier , 63103@debbugs.gnu.org Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168257746812162 (code B ref 63103); Thu, 27 Apr 2023 06:38:01 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 06:37:48 +0000 Received: from localhost ([127.0.0.1]:57454 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prvGG-0003A6-GI for submit@debbugs.gnu.org; Thu, 27 Apr 2023 02:37:48 -0400 Received: from server.qxqx.de ([178.63.65.180]:57529 helo=mail.qxqx.de) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prvGD-00039o-DH for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 02:37:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=qxqx.de; s=mail1392553390; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=49K4bxdEGkJSkFQnlZS8Xj+HtP8sTi4QFzEF20qv6Ys=; b=Uctp8gOfdvhppDHw3uYGxi3BG6 XbSRepWulkZcNn2Pu4DI7ePIFdAvmXiODX1qMozvTdkJ4bGQZEyDvWj26yyiqi3euIlFn1N3aRO35 1DBdlYr2r4ME7a1rsdN8v2vVxAdkb05ksUi8mS1+wpFfNi+GI69SvE282HtQHKCeuhK8=; Message-ID: Date: Thu, 27 Apr 2023 08:37:36 +0200 MIME-Version: 1.0 Content-Language: en-US References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> From: Daniel Mendler In-Reply-To: <871qk5516v.fsf@posteo.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -2.3 (--) 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: -3.3 (---) On 4/27/23 07:44, Philip Kaludercic wrote: >> The problem is that `(nconc list nil)` is optimized to `list`. However >> improper lists like `(a b c . 0)` should be turned into `(a b c)`. > > Where is this behaviour documented? This behavior is not documented explicitly. However the docstring states that "Only the last argument is not altered, and need not be a list". Due to symmetry reasons it is not far-fetched to assume that when `nconc' can be used to turn a proper list into an improper list, that the inverse works too. Most of the docstrings do not specify functions on such a detailed and formal level. Maybe Stefan can give a bit more background regarding the support of improper list for Elisp functions. The main use case I've observed is for `completion-all-completions' which uses the last cdr to return the base position of the completion. Iirc `cl-loop' also handles improper lists. Generally I'd be wary about changing the semantics of functions since this leads to bugs which are hard to debug. One could decide to restrict `nconc' to proper lists only, not only via the bytecompiler optimization but also by erroring out if improper lists are passed as argument. Probably it is easier to explicitly allow the last nil argument in the bytecode optimizer specially to retain the existing behavior for improper lists. Daniel From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 09:48:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Daniel Mendler Cc: Philip Kaludercic , Stefan Monnier , 63103@debbugs.gnu.org Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168258884532702 (code B ref 63103); Thu, 27 Apr 2023 09:48:02 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 09:47:25 +0000 Received: from localhost ([127.0.0.1]:57595 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pryDk-0008VO-RV for submit@debbugs.gnu.org; Thu, 27 Apr 2023 05:47:25 -0400 Received: from mail229c50.megamailservers.eu ([91.136.10.239]:54572 helo=mail36c50.megamailservers.eu) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1pryDi-0008VE-Lf for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 05:47:24 -0400 X-Authenticated-User: mattiase@bredband.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megamailservers.eu; s=maildub; t=1682588837; bh=sf4zJOf3YOdDzOovifpUuRJ31LssX6tjLloL+7PNhV4=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=G4WhFv+eh3Jbhz61xuSnh6sPXc5K1HMCBLh+W4t2/Pe6PDBDS/zWKkBYVqEkyQ2Rs CnJP3UneFJizDfbNuAT6RAQxF94/I2CvxQRCZ5RRwXyuSifhvtfUJvs6B9QVqh4Wyk e4ONH1Gug5wAuuo5zltrSaVlhCkVxAKFbSexwXEs= Feedback-ID: mattiase@acm.or Received: from smtpclient.apple (c188-150-165-235.bredband.tele2.se [188.150.165.235]) (authenticated bits=0) by mail36c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 33R9lEkS123048; Thu, 27 Apr 2023 09:47:16 +0000 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.15\)) From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= In-Reply-To: Date: Thu, 27 Apr 2023 11:47:13 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> X-Mailer: Apple Mail (2.3654.120.0.1.15) X-VADE-SPAMSTATE: clean X-VADE-SPAMSCORE: -100 X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrfeduiedgvddtucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffquffvqffrkfetpdfqfgfvpdfgpfggqdevhedtnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpegtggfuhfgjffevgffkfhfvofesthhqmhdthhdtvdenucfhrhhomhepofgrthhtihgrshcugfhnghguvghgnohrugcuoehmrghtthhirghsvgesrggtmhdrohhrgheqnecuggftrfgrthhtvghrnhepveekffdujefhkeehvdfgffeikefghfefvdekueffleegfeekueelhfejieefkefgnecukfhppedukeekrdduhedtrdduieehrddvfeehnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudekkedrudehtddrudeihedrvdefhedphhgvlhhopehsmhhtphgtlhhivghnthdrrghpphhlvgdpmhgrihhlfhhrohhmpehmrghtthhirghsvgesrggtmhdrohhrghdpnhgspghrtghpthhtohepgedprhgtphhtthhopehmrghilhesuggrnhhivghlqdhmvghnughlvghrrdguvgdprhgtphhtthhopehphhhilhhiphhksehpohhsthgvohdrnhgvthdprhgtphhtthhopeeifedutdefseguvggssghughhsrdhgnhhurdhorhhgpdhrtghpthhtohepmhhonhhnihgvrhesihhrohdruhhmohhnthhrvggrlhdrtggr X-Origin-Country: SE X-Spam-Score: 1.0 (+) 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: -0.0 (/) 27 apr. 2023 kl. 08.37 skrev Daniel Mendler : > This behavior is not documented explicitly. However the docstring = states > that "Only the last argument is not altered, and need not be a list". Indeed. It's clear that this behaviour was never really intended, but = also that it was a natural consequence of most Lisp implementations. For = instance, Common Lisp specifies this behaviour but only did so after = errata. Although the utility of accepting dotted lists is very slight and = requiring proper list for all but the last argument would have made it = easier for us, this obviously needs to be a well-reasoned change if made = at all. I'll remove the troublesome compiler transform right away. > Due to symmetry reasons it is not far-fetched to assume that when > `nconc' can be used to turn a proper list into an improper list, that > the inverse works too. I don't think that's a valid assumption -- when the documentation says = that arguments are lists, then they should be proper lists. The = behaviour for improper lists needs to be specified explicitly, in = particular in this case when the function actually overwrites arbitrary = information in the input, not just a terminating nil. Thank you very much for finding this bug! From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Daniel Mendler Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 10:43:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Cc: Philip Kaludercic , Stefan Monnier , 63103@debbugs.gnu.org Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.16825921496790 (code B ref 63103); Thu, 27 Apr 2023 10:43:02 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 10:42:29 +0000 Received: from localhost ([127.0.0.1]:57654 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prz53-0001lS-1M for submit@debbugs.gnu.org; Thu, 27 Apr 2023 06:42:29 -0400 Received: from server.qxqx.de ([178.63.65.180]:35519 helo=mail.qxqx.de) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prz50-0001lE-6r for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 06:42:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=qxqx.de; s=mail1392553390; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=fASm2ba/g7QmSjGWfZyABSn1EUVh7fWAOAms6ECAT4Y=; b=ay28GqiFgjN54MBZlzVabDwxKD B0dUa/EOsV9gZPTSUSD7ybI5aEYCRzxl7mH/f6TQd+ActVzecfrLAnDa4TV33BsqADkA6Azf1CDrP dtpZXpEgl9hgIx0qbc1RexMsCRQt9RcZc7AkY+EYXtzd7Q2yr+Tp3cS5HjXE4G4llEGQ=; Message-ID: <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> Date: Thu, 27 Apr 2023 12:42:17 +0200 MIME-Version: 1.0 References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> Content-Language: en-US From: Daniel Mendler In-Reply-To: <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) 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: -3.3 (---) On 4/27/23 11:47, Mattias Engdegård wrote: > Although the utility of accepting dotted lists is very slight and requiring proper list for all but the last argument would have made it easier for us, this obviously needs to be a well-reasoned change if made at all. I'll remove the troublesome compiler transform right away. Thanks for fixing the issue! I agree that improper lists are of limited utility. It wasn't the best idea to use them for the `completion-all-completions' API since this makes manipulation of the result for API users less convenient from my experience. >> Due to symmetry reasons it is not far-fetched to assume that when >> `nconc' can be used to turn a proper list into an improper list, that >> the inverse works too. > > I don't think that's a valid assumption -- when the documentation says that arguments are lists, then they should be proper lists. The behaviour for improper lists needs to be specified explicitly, in particular in this case when the function actually overwrites arbitrary information in the input, not just a terminating nil. Well, my assumption didn't completely stand on its own. Given that the last argument can be a non-list suggests that the last argument is not inspected or mutated, but just overwrites the cdr of the second to last argument. This then implies that the second to last argument could also be an improper list. Given that CL and Elisp have behaved like this for a long time, it seems better to preserve this property. I think it is kind of nice that `nconc' can be used as a tool to turn a proper list into an improper list and vice versa. It may be good to document this in the `nconc' docstring and the Elisp manual. Daniel From unknown Tue Aug 19 06:31:05 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: Maks Subject: bug#63103: closed (Re: bug#63103: 30.0.50; nconc compiler optimization breaks user packages) Message-ID: References: <877cty45rx.fsf@gmail.com> X-Gnu-PR-Message: they-closed 63103 X-Gnu-PR-Package: emacs Reply-To: 63103@debbugs.gnu.org Date: Thu, 27 Apr 2023 12:30:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1682598603-28126-1" This is a multi-part message in MIME format... ------------=_1682598603-28126-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #63103: 30.0.50; nconc compiler optimization breaks user packages which was filed against the emacs package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 63103@debbugs.gnu.org. --=20 63103: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D63103 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1682598603-28126-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 63103-done) by debbugs.gnu.org; 27 Apr 2023 12:29:09 +0000 Received: from localhost ([127.0.0.1]:57703 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps0kH-0007IG-Dl for submit@debbugs.gnu.org; Thu, 27 Apr 2023 08:29:09 -0400 Received: from mail70c50.megamailservers.eu ([91.136.10.80]:42066) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps0kE-0007I6-Fv for 63103-done@debbugs.gnu.org; Thu, 27 Apr 2023 08:29:07 -0400 X-Authenticated-User: mattiase@bredband.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megamailservers.eu; s=maildub; t=1682598541; bh=dtvntlcq80k85ufkjyh2yYQcL1mrUWkyL8e8sBJODyg=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=RBAGx6w4sG2+mnutHk5n85MYG5qiIKo4Ph5xOPwRfTS4jSPqQXZd/M7gY+tZBLkX4 AsC2DYxOptJL0muzWXBw063tIa3MWsEwe7kfx6aCz6VIT1o3wSFsv6jTxL0h6IgXCV KxD56z4Kekefut1o1YX70Aeq6BzKzzNlrhQS/G70= Feedback-ID: mattiase@acm.or Received: from smtpclient.apple (c188-150-165-235.bredband.tele2.se [188.150.165.235]) (authenticated bits=0) by mail70c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 33RCSwC6001684; Thu, 27 Apr 2023 12:29:00 +0000 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.15\)) Subject: Re: bug#63103: 30.0.50; nconc compiler optimization breaks user packages From: =?utf-8?Q?Mattias_Engdeg=C3=A5rd?= In-Reply-To: <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> Date: Thu, 27 Apr 2023 14:28:58 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> To: Daniel Mendler X-Mailer: Apple Mail (2.3654.120.0.1.15) X-VADE-SPAMSTATE: clean X-VADE-SPAMSCORE: -100 X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrfeduiedghedvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffquffvqffrkfetpdfqfgfvpdfgpfggqdevhedtnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpegtggfuhfgjffevgffkfhfvofesthhqmhdthhdtvdenucfhrhhomhepofgrthhtihgrshcugfhnghguvghgnohrugcuoehmrghtthhirghsvgesrggtmhdrohhrgheqnecuggftrfgrthhtvghrnhepveekffdujefhkeehvdfgffeikefghfefvdekueffleegfeekueelhfejieefkefgnecukfhppedukeekrdduhedtrdduieehrddvfeehnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudekkedrudehtddrudeihedrvdefhedphhgvlhhopehsmhhtphgtlhhivghnthdrrghpphhlvgdpmhgrihhlfhhrohhmpehmrghtthhirghsvgesrggtmhdrohhrghdpnhgspghrtghpthhtohepgedprhgtphhtthhopehmrghilhesuggrnhhivghlqdhmvghnughlvghrrdguvgdprhgtphhtthhopehphhhilhhiphhksehpohhsthgvohdrnhgvthdprhgtphhtthhopeeifedutdefqdguohhnvgesuggvsggsuhhgshdrghhnuhdrohhrghdprhgtphhtthhopehmohhnnhhivghrsehirhhordhumhhonhhtrhgvrghlrdgtrg X-Origin-Country: SE X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: 63103-done Cc: Philip Kaludercic , Stefan Monnier , 63103-done@debbugs.gnu.org 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: -0.0 (/) 27 apr. 2023 kl. 12.42 skrev Daniel Mendler : > I think it is > kind of nice that `nconc' can be used as a tool to turn a proper list > into an improper list and vice versa. It's a bit obscure, though -- (setcdr (last X) nil) is a lot clearer than (nconc X nil) and when the latter is preferred for performance, a comment might be = polite to the reader. Anyway, a fix has been pushed to master, and the manual entry for = `nconc` got an extra example. ------------=_1682598603-28126-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 27 Apr 2023 04:16:25 +0000 Received: from localhost ([127.0.0.1]:57315 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prt3Q-0004p2-JQ for submit@debbugs.gnu.org; Thu, 27 Apr 2023 00:16:25 -0400 Received: from lists.gnu.org ([209.51.188.17]:59654) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prnyk-0003sk-28 for submit@debbugs.gnu.org; Wed, 26 Apr 2023 18:51:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prnyj-0002GR-P8 for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 18:51:13 -0400 Received: from mail-ej1-x632.google.com ([2a00:1450:4864:20::632]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1prnyi-00031o-2g for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 18:51:13 -0400 Received: by mail-ej1-x632.google.com with SMTP id a640c23a62f3a-94f7a7a3351so1477953366b.2 for ; Wed, 26 Apr 2023 15:51:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682549470; x=1685141470; h=mime-version:message-id:date:subject:to:from:from:to:cc:subject :date:message-id:reply-to; bh=Tq0XU/LFG0aak2vhXo8Zc3NF7eIIEIJ2osCnVSRAItM=; b=WR0zw8W389SpcRrxXUnrZ/nzp1q4BpeWLIqL/FteBxtnsODMzdooOh/1lcxjwVctR8 6bl/feJvm0SlH4t94MhnqzFJNc4odIO8DZvkZwennES7bf7SeHitavTzNsC7mXr5Juxd 0gLPWLNPqy2SWvOifzNo/iziG0Tw8N7wmJ0/c9SlvT82291jpORzP28/7MYGZLy5BQjS 5S/kXEKKRUGUZW/C1ewpYHE3oLpvyjtpaqEA9hN+mn57yHUkaREZvvyWIRg4IHAAk3O1 USf2TcqH7qcrkCI/AU0AizHfn0x9pxnsswCl8Jh9Nlb99X6vtz8Llh4DY7KWEuKhtIty hw/A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682549470; x=1685141470; h=mime-version:message-id:date:subject:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Tq0XU/LFG0aak2vhXo8Zc3NF7eIIEIJ2osCnVSRAItM=; b=mHM6UjvXdz7P4b62gkZ5eypyunjZnYNlZrsxACT1WQYW6uL5fW5lFiQGzXxdnYr8q8 hP4XVywIZ9qAPjbCPqlk4x2dja5B4liyRnjPVL4vwRW03a99Cjyw6D2j4oxqGW+BreKl YFs01TbdxLXwQ6/WHz4IZqGpgsFsVviKHlnsvXkYxB3zaoK0JGIRwedSB/Q0aCdFGbRJ q9xW7EgYYD0HkXROTWrf84lYUCSBx5QIv4s0EYxqJBi26ZrVZlZvm43oXT6727BHJqZs FOInOR15OFY9PeBf2X3rCDwbWth5PRuM2LN1adjGrdwwSce/cO7gQQIXCDN/qlGw6hl8 eSdQ== X-Gm-Message-State: AAQBX9fMyZl0lZYqhc+ejvz2yFL6lkVc9eV7w5pzz3q7dkYibDfPQH+F 3MfcnrbLnGVC8W9Gc0yeket/mCeTQoQ= X-Google-Smtp-Source: AKy350YHzXddnrDAeSrdeKgdN81JLBqfLfsgex1TXIuEwdr6ndIruHcqXf8fKmwLwJOOs3Up5Fwncg== X-Received: by 2002:a17:906:4915:b0:94a:5d16:a280 with SMTP id b21-20020a170906491500b0094a5d16a280mr19024892ejq.9.1682549470323; Wed, 26 Apr 2023 15:51:10 -0700 (PDT) Received: from pop-os (78-152-187-146.pool.ic.km.ua. [78.152.187.146]) by smtp.gmail.com with ESMTPSA id mb20-20020a170906eb1400b0094f432f2429sm8782758ejb.109.2023.04.26.15.51.09 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Apr 2023 15:51:10 -0700 (PDT) From: Maks To: bug-gnu-emacs@gnu.org Subject: 30.0.50; nconc compiler optimization breaks user packages Date: Thu, 27 Apr 2023 01:50:42 +0300 Message-ID: <877cty45rx.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2a00:1450:4864:20::632; envelope-from=mvproton@gmail.com; helo=mail-ej1-x632.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Thu, 27 Apr 2023 00:16:18 -0400 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: -2.3 (--) Hello, I'm sorry if you received similar emails from me, there were problems with sending. Commit e6ca5834a6eab91023e9f968b65683d0a74db1e7 ('Improved nconc and append compiler optimisations') breaks vertico.el package. After very long debugging time I figured out that this commit affects behavior of `completion-hilit-commonality` function of minibuffer.el. I don't completely understand how it works buf try do describe some details. If I set breakpoint before breaking commit to 'vertico--affixate then I'll get next stacktrace ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))))) vertico--arrange-candidates() vertico--exhibit() ... ``` buf if I do the same after breaking commit I'll get stacktrace ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))) . 0)) vertico--arrange-candidates() vertico--exhibit() ... ``` As you can see, the difference is in the tail of the list. With the such tail vertico.el package crashed with error: ``` Error in post-command-hook (vertico--exhibit): (wrong-type-argument listp 0) ``` But testing `completion-hilit-commonality` in REPL separetely from vertico.el package give the same result (with 0 at the end of list). Before sending this report I have tried a lot of versions of the vertico.el package and have the same result. So I tend to think that problem is not directly related to package. ------------=_1682598603-28126-1-- From unknown Tue Aug 19 06:31:05 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: Maks Subject: bug#63100: closed (Re: bug#63103: 30.0.50; nconc compiler optimization breaks user packages) Message-ID: References: <87pm7q8xix.fsf@gmail.com> X-Gnu-PR-Message: they-closed 63100 X-Gnu-PR-Package: emacs Reply-To: 63100@debbugs.gnu.org Date: Thu, 27 Apr 2023 12:30:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1682598603-28126-3" This is a multi-part message in MIME format... ------------=_1682598603-28126-3 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #63103: 30.0.50; nconc compiler optimization breaks user packages which was filed against the emacs package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 63100@debbugs.gnu.org. --=20 63103: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D63103 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1682598603-28126-3 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 63103-done) by debbugs.gnu.org; 27 Apr 2023 12:29:09 +0000 Received: from localhost ([127.0.0.1]:57703 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps0kH-0007IG-Dl for submit@debbugs.gnu.org; Thu, 27 Apr 2023 08:29:09 -0400 Received: from mail70c50.megamailservers.eu ([91.136.10.80]:42066) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps0kE-0007I6-Fv for 63103-done@debbugs.gnu.org; Thu, 27 Apr 2023 08:29:07 -0400 X-Authenticated-User: mattiase@bredband.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megamailservers.eu; s=maildub; t=1682598541; bh=dtvntlcq80k85ufkjyh2yYQcL1mrUWkyL8e8sBJODyg=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=RBAGx6w4sG2+mnutHk5n85MYG5qiIKo4Ph5xOPwRfTS4jSPqQXZd/M7gY+tZBLkX4 AsC2DYxOptJL0muzWXBw063tIa3MWsEwe7kfx6aCz6VIT1o3wSFsv6jTxL0h6IgXCV KxD56z4Kekefut1o1YX70Aeq6BzKzzNlrhQS/G70= Feedback-ID: mattiase@acm.or Received: from smtpclient.apple (c188-150-165-235.bredband.tele2.se [188.150.165.235]) (authenticated bits=0) by mail70c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 33RCSwC6001684; Thu, 27 Apr 2023 12:29:00 +0000 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.15\)) Subject: Re: bug#63103: 30.0.50; nconc compiler optimization breaks user packages From: =?utf-8?Q?Mattias_Engdeg=C3=A5rd?= In-Reply-To: <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> Date: Thu, 27 Apr 2023 14:28:58 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> To: Daniel Mendler X-Mailer: Apple Mail (2.3654.120.0.1.15) X-VADE-SPAMSTATE: clean X-VADE-SPAMSCORE: -100 X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrfeduiedghedvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffquffvqffrkfetpdfqfgfvpdfgpfggqdevhedtnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpegtggfuhfgjffevgffkfhfvofesthhqmhdthhdtvdenucfhrhhomhepofgrthhtihgrshcugfhnghguvghgnohrugcuoehmrghtthhirghsvgesrggtmhdrohhrgheqnecuggftrfgrthhtvghrnhepveekffdujefhkeehvdfgffeikefghfefvdekueffleegfeekueelhfejieefkefgnecukfhppedukeekrdduhedtrdduieehrddvfeehnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudekkedrudehtddrudeihedrvdefhedphhgvlhhopehsmhhtphgtlhhivghnthdrrghpphhlvgdpmhgrihhlfhhrohhmpehmrghtthhirghsvgesrggtmhdrohhrghdpnhgspghrtghpthhtohepgedprhgtphhtthhopehmrghilhesuggrnhhivghlqdhmvghnughlvghrrdguvgdprhgtphhtthhopehphhhilhhiphhksehpohhsthgvohdrnhgvthdprhgtphhtthhopeeifedutdefqdguohhnvgesuggvsggsuhhgshdrghhnuhdrohhrghdprhgtphhtthhopehmohhnnhhivghrsehirhhordhumhhonhhtrhgvrghlrdgtrg X-Origin-Country: SE X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: 63103-done Cc: Philip Kaludercic , Stefan Monnier , 63103-done@debbugs.gnu.org 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: -0.0 (/) 27 apr. 2023 kl. 12.42 skrev Daniel Mendler : > I think it is > kind of nice that `nconc' can be used as a tool to turn a proper list > into an improper list and vice versa. It's a bit obscure, though -- (setcdr (last X) nil) is a lot clearer than (nconc X nil) and when the latter is preferred for performance, a comment might be = polite to the reader. Anyway, a fix has been pushed to master, and the manual entry for = `nconc` got an extra example. ------------=_1682598603-28126-3 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 27 Apr 2023 04:16:22 +0000 Received: from localhost ([127.0.0.1]:57309 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prt3L-0004od-9z for submit@debbugs.gnu.org; Thu, 27 Apr 2023 00:16:22 -0400 Received: from lists.gnu.org ([209.51.188.17]:40222) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prhDQ-0007R5-OI for submit@debbugs.gnu.org; Wed, 26 Apr 2023 11:37:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prhDO-0003U9-UD for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 11:37:55 -0400 Received: from mail-ej1-x634.google.com ([2a00:1450:4864:20::634]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1prhDN-0005fT-AM for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 11:37:54 -0400 Received: by mail-ej1-x634.google.com with SMTP id a640c23a62f3a-95f4c5cb755so121900366b.0 for ; Wed, 26 Apr 2023 08:37:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682523471; x=1685115471; h=mime-version:message-id:date:subject:to:from:from:to:cc:subject :date:message-id:reply-to; bh=82vT6fp+WzG7VVHratAI1bouRE2/La9zxLtYiZkA5CE=; b=GTIoxetWyniYdfT/vT3TrsQCVWg/LguesGzzoMHW03EBEec45KXtj4ZYKSTEzFhO2a 0bT8TUWMLT7EHmVKSkEKS2MkWDZzUJ7P8sedXi5GH6EK0O7tRsyb9ej9kwD1QsaqjL1k JYVgargpbLdWIB8EanzOubIlzQh4gfBPf3ln0ygJ3SA/prJRQ/kGR6gSEHjnB5Ne5GMB GdTA7VdPe7/Oaaelb2wf5Rqbc7O8kx0PJDMYEQ3WgocP1tgPCAViBGQjR/01ocwPBXOd DaR3p/3FM+oRjAq4ASd4xLSivdBxFwWe0jUC77kZ1OtL5GcaMnsZ1b2M6kGRn/CLdF5x fF1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682523471; x=1685115471; h=mime-version:message-id:date:subject:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=82vT6fp+WzG7VVHratAI1bouRE2/La9zxLtYiZkA5CE=; b=MWixU/HV9wQhpze+3LHE3YENo2zefCvqxt/cvdSHnXWPCtWnEXoWYmoZmXB9vr9K/y ghJ+JS4fHNm3gQqFzxVJr/WPH9QS9o3suK2Fc9s+9AMoZUPfPQm7UPM1j4g8NvXaGYOi KCL2UoOmQqImyNO/aDQIH4C3zttKtIWxJWaQl+Ks1w4PiM8soHX4t8Pz6Wu6A1wFVrAc Ct+iuGss5V8YPmPI3gMc90WmqjaKJTEOBghsjARLlNtMMPOT34fF/J7Nmp9VUp9vbJbU JKltsMAAfG/4rc+SPAGGukFbCwBg0qSE+CCZ0XsQbfXshVg2jUs+KPjFs4TmNiPkRIF8 lxbw== X-Gm-Message-State: AAQBX9fcHXV72N3sTD/9InzTwc1cgnrRKtVpoACQSvBcH5cTTE0diuN3 fdczdGZY577G+n6LN8806xAFr+k7GyM= X-Google-Smtp-Source: AKy350aII6IeP0k8iRbbnkxs95ts55Vr2BqXL0/GuYlG3YzxGpdQobKXYgBRoL4SDdT9nV+gu4s17A== X-Received: by 2002:a17:906:52cc:b0:94a:658e:1180 with SMTP id w12-20020a17090652cc00b0094a658e1180mr14830958ejn.26.1682523471286; Wed, 26 Apr 2023 08:37:51 -0700 (PDT) Received: from pop-os (78-152-187-146.pool.ic.km.ua. [78.152.187.146]) by smtp.gmail.com with ESMTPSA id la5-20020a170906ad8500b0094e877ec197sm8535319ejb.148.2023.04.26.08.37.50 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Apr 2023 08:37:51 -0700 (PDT) From: Maks To: bug-gnu-emacs@gnu.org Subject: 30.0.50; nconc compiler optimization breaks user packages Date: Wed, 26 Apr 2023 18:37:42 +0300 Message-ID: <87pm7q8xix.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2a00:1450:4864:20::634; envelope-from=mvproton@gmail.com; helo=mail-ej1-x634.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Thu, 27 Apr 2023 00:16:18 -0400 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: -2.3 (--) Hello, after long debugging time I figured out that commit e6ca5834a6eab91023e9f968b65683d0a74db1e7 ('Improved nconc and append compiler optimisations') breaks package vertico.el. I'm not completely understanding how it works but try to describe the problem. If I set breakpoint before breaking commit I get the following stacktrace: ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))))) vertico--arrange-candidates() vertico--exhibit() ``` , but after breaking commit I get slightly different stacktrace: ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))) . 0)) vertico--arrange-candidates() vertico--exhibit() ``` As you can see, the difference is in the tail of the input list. This list comes from completion-hilit-commonality function from minibuffer.el and it has nconc call. But testing completion-hilit-commonality in REPL separetely from vertico.el package give the same result (with 0 at the end of list). Before sending this report I have tried a lot of versions of the vertico.el package and have the same result. So I tend to think that problem is not directly related to package. ------------=_1682598603-28126-3-- From unknown Tue Aug 19 06:31:05 2025 MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) X-Loop: help-debbugs@gnu.org From: help-debbugs@gnu.org (GNU bug Tracking System) To: Maks Subject: bug#63101: closed (Re: bug#63103: 30.0.50; nconc compiler optimization breaks user packages) Message-ID: References: <87o7na8wly.fsf@gmail.com> X-Gnu-PR-Message: they-closed 63101 X-Gnu-PR-Package: emacs Reply-To: 63101@debbugs.gnu.org Date: Thu, 27 Apr 2023 12:30:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1682598603-28126-5" This is a multi-part message in MIME format... ------------=_1682598603-28126-5 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #63103: 30.0.50; nconc compiler optimization breaks user packages which was filed against the emacs package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 63101@debbugs.gnu.org. --=20 63103: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D63103 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems ------------=_1682598603-28126-5 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 63103-done) by debbugs.gnu.org; 27 Apr 2023 12:29:09 +0000 Received: from localhost ([127.0.0.1]:57703 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps0kH-0007IG-Dl for submit@debbugs.gnu.org; Thu, 27 Apr 2023 08:29:09 -0400 Received: from mail70c50.megamailservers.eu ([91.136.10.80]:42066) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps0kE-0007I6-Fv for 63103-done@debbugs.gnu.org; Thu, 27 Apr 2023 08:29:07 -0400 X-Authenticated-User: mattiase@bredband.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megamailservers.eu; s=maildub; t=1682598541; bh=dtvntlcq80k85ufkjyh2yYQcL1mrUWkyL8e8sBJODyg=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=RBAGx6w4sG2+mnutHk5n85MYG5qiIKo4Ph5xOPwRfTS4jSPqQXZd/M7gY+tZBLkX4 AsC2DYxOptJL0muzWXBw063tIa3MWsEwe7kfx6aCz6VIT1o3wSFsv6jTxL0h6IgXCV KxD56z4Kekefut1o1YX70Aeq6BzKzzNlrhQS/G70= Feedback-ID: mattiase@acm.or Received: from smtpclient.apple (c188-150-165-235.bredband.tele2.se [188.150.165.235]) (authenticated bits=0) by mail70c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 33RCSwC6001684; Thu, 27 Apr 2023 12:29:00 +0000 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.15\)) Subject: Re: bug#63103: 30.0.50; nconc compiler optimization breaks user packages From: =?utf-8?Q?Mattias_Engdeg=C3=A5rd?= In-Reply-To: <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> Date: Thu, 27 Apr 2023 14:28:58 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> To: Daniel Mendler X-Mailer: Apple Mail (2.3654.120.0.1.15) X-VADE-SPAMSTATE: clean X-VADE-SPAMSCORE: -100 X-VADE-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvhedrfeduiedghedvucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecujffquffvqffrkfetpdfqfgfvpdfgpfggqdevhedtnecuuegrihhlohhuthemuceftddunecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenucfjughrpegtggfuhfgjffevgffkfhfvofesthhqmhdthhdtvdenucfhrhhomhepofgrthhtihgrshcugfhnghguvghgnohrugcuoehmrghtthhirghsvgesrggtmhdrohhrgheqnecuggftrfgrthhtvghrnhepveekffdujefhkeehvdfgffeikefghfefvdekueffleegfeekueelhfejieefkefgnecukfhppedukeekrdduhedtrdduieehrddvfeehnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepudekkedrudehtddrudeihedrvdefhedphhgvlhhopehsmhhtphgtlhhivghnthdrrghpphhlvgdpmhgrihhlfhhrohhmpehmrghtthhirghsvgesrggtmhdrohhrghdpnhgspghrtghpthhtohepgedprhgtphhtthhopehmrghilhesuggrnhhivghlqdhmvghnughlvghrrdguvgdprhgtphhtthhopehphhhilhhiphhksehpohhsthgvohdrnhgvthdprhgtphhtthhopeeifedutdefqdguohhnvgesuggvsggsuhhgshdrghhnuhdrohhrghdprhgtphhtthhopehmohhnnhhivghrsehirhhordhumhhonhhtrhgvrghlrdgtrg X-Origin-Country: SE X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: 63103-done Cc: Philip Kaludercic , Stefan Monnier , 63103-done@debbugs.gnu.org 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: -0.0 (/) 27 apr. 2023 kl. 12.42 skrev Daniel Mendler : > I think it is > kind of nice that `nconc' can be used as a tool to turn a proper list > into an improper list and vice versa. It's a bit obscure, though -- (setcdr (last X) nil) is a lot clearer than (nconc X nil) and when the latter is preferred for performance, a comment might be = polite to the reader. Anyway, a fix has been pushed to master, and the manual entry for = `nconc` got an extra example. ------------=_1682598603-28126-5 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 27 Apr 2023 04:16:22 +0000 Received: from localhost ([127.0.0.1]:57311 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prt3O-0004oq-Ct for submit@debbugs.gnu.org; Thu, 27 Apr 2023 00:16:22 -0400 Received: from lists.gnu.org ([209.51.188.17]:52668) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1prhWR-00088S-QB for submit@debbugs.gnu.org; Wed, 26 Apr 2023 11:57:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1prhWR-0007BL-9z for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 11:57:35 -0400 Received: from mail-ej1-x630.google.com ([2a00:1450:4864:20::630]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1prhWP-0000zg-NA for bug-gnu-emacs@gnu.org; Wed, 26 Apr 2023 11:57:35 -0400 Received: by mail-ej1-x630.google.com with SMTP id a640c23a62f3a-94f0dd117dcso1074621066b.3 for ; Wed, 26 Apr 2023 08:57:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682524651; x=1685116651; h=mime-version:message-id:date:subject:to:from:from:to:cc:subject :date:message-id:reply-to; bh=82vT6fp+WzG7VVHratAI1bouRE2/La9zxLtYiZkA5CE=; b=ka9nAxKiuFDG51W6ar2u2x+E7SwpFphfRZBoR3H1bWdWe2Ebc+vPU/prKywtFkjafp PnBlRBZB+2pfLlmmzzdK5YNW9jQdHoVkzIhAJDnQteSdUAL41TwkKoIJRWDNRvxw7iCM ls3bY2T0R5DFdDYlbEji74lmPp7ewk60Tntvl2JrVRpoGdBPstCpw/pNNCMbUr3PD9u0 LVXkY/bVu7DSYZE2hTUQNQUi7b+hmYjAblFk8i2WngLTt5Vjl+c5jpt28zfxLQqhOXC8 ci86OxOBT7f9eWa/lqVbwkxssS3d6efO0QroxSPjULR8GKWdl28i7rD1pnoWIegxOqHG J6wQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682524651; x=1685116651; h=mime-version:message-id:date:subject:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=82vT6fp+WzG7VVHratAI1bouRE2/La9zxLtYiZkA5CE=; b=g17zZNK5nkUK16isslbX6PQAPfEGaP/oo1qsqBJ3geeWg7csl2mDzsF1F9I9CNehh8 bhbVGc9ktBnhe7NtDaTQlQrxjmx0j18HpU/s0OoUbxs8AlZTl8i3bFNCDCSwbG1mt+62 Q/TwYyubAoXFt17RPSDo6Yzi1YoSlP8/lzxhSyXChXk7S7X06d6OUPCEzqdnq4PNokQ/ zwYzsnyaeAuliFoK34O/NUYcJcDIQ/ZjyyJyi18s4ItHJnbS95k29R/YkdRW2IujIA6N NUYn2MzCftvPAQhF6qTdAcL47YbE6Nmdc2gKEBg6L99Q4YyWHjiyNap4+qzpW9CzUa0c c6Hg== X-Gm-Message-State: AAQBX9fN6v1taeSQ48Ti/LuVYQWm3ZwPbvzTta3LzfFwB9lCaXfsoaPc 2J02MhHCUpJr1tptWO5a5P2zu2mIwxE= X-Google-Smtp-Source: AKy350bcuv1EVoS1XfKBq+srpQgvjKU9tECy8D0MbDR31ItaZKxL8z7YNuYu3l+zeTi5592sRG7o7w== X-Received: by 2002:a17:907:98f6:b0:94f:6ca2:e34 with SMTP id ke22-20020a17090798f600b0094f6ca20e34mr18084634ejc.66.1682524650956; Wed, 26 Apr 2023 08:57:30 -0700 (PDT) Received: from pop-os (78-152-187-146.pool.ic.km.ua. [78.152.187.146]) by smtp.gmail.com with ESMTPSA id y21-20020a17090614d500b0094b87711c9fsm8406209ejc.99.2023.04.26.08.57.30 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Apr 2023 08:57:30 -0700 (PDT) From: Maks To: bug-gnu-emacs@gnu.org Subject: 30.0.50; nconc compiler optimization breaks user packages Date: Wed, 26 Apr 2023 18:57:29 +0300 Message-ID: <87o7na8wly.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2a00:1450:4864:20::630; envelope-from=mvproton@gmail.com; helo=mail-ej1-x630.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Thu, 27 Apr 2023 00:16:18 -0400 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: -2.3 (--) Hello, after long debugging time I figured out that commit e6ca5834a6eab91023e9f968b65683d0a74db1e7 ('Improved nconc and append compiler optimisations') breaks package vertico.el. I'm not completely understanding how it works but try to describe the problem. If I set breakpoint before breaking commit I get the following stacktrace: ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))))) vertico--arrange-candidates() vertico--exhibit() ``` , but after breaking commit I get slightly different stacktrace: ``` Debugger entered--entering a function: * vertico--affixate((#("report-emacs-bug" 0 1 (face (completions-first-difference))) #("cd" 0 1 (face (completions-first-difference))) #("5x5" 0 1 (face (completions-first-difference))) #("arp" 0 1 (face (completions-first-difference))) #("dbx" 0 1 (face (completions-first-difference))) #("dig" 0 1 (face (completions-first-difference))) #("erc" 0 1 (face (completions-first-difference))) #("ert" 0 1 (face (completions-first-difference))) #("eww" 0 1 (face (completions-first-difference))) #("ftp" 0 1 (face (completions-first-difference))) . 0)) vertico--arrange-candidates() vertico--exhibit() ``` As you can see, the difference is in the tail of the input list. This list comes from completion-hilit-commonality function from minibuffer.el and it has nconc call. But testing completion-hilit-commonality in REPL separetely from vertico.el package give the same result (with 0 at the end of list). Before sending this report I have tried a lot of versions of the vertico.el package and have the same result. So I tend to think that problem is not directly related to package. ------------=_1682598603-28126-5-- From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Daniel Mendler Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 12:56:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Cc: Philip Kaludercic , Stefan Monnier , 63103-done@debbugs.gnu.org Received: via spool by 63103-done@debbugs.gnu.org id=D63103.168260011331158 (code D ref 63103); Thu, 27 Apr 2023 12:56:01 +0000 Received: (at 63103-done) by debbugs.gnu.org; 27 Apr 2023 12:55:13 +0000 Received: from localhost ([127.0.0.1]:57726 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps19V-00086Q-6V for submit@debbugs.gnu.org; Thu, 27 Apr 2023 08:55:13 -0400 Received: from server.qxqx.de ([178.63.65.180]:40305 helo=mail.qxqx.de) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps19T-00085I-4J for 63103-done@debbugs.gnu.org; Thu, 27 Apr 2023 08:55:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=qxqx.de; s=mail1392553390; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=FuvncDiBYchlayF349oxaxP3064CPz4jZ4baDS5Oa1Y=; b=seMjLyHDAFjkLKIEgC3k88PHON eOekQ1ILaHKXG2zLK9RTWgIIx8TSHyMTMBK1DO8cDS6Se3T0iuIIdTk1XFfzm9bA7Stfcrv0OoDEb acm7eO4Bs2SNnamqiDfefbTWk7+piqG8SH5gpd4oRhVBjygY1KVh9k9+Z7TnPMuy830g=; Message-ID: Date: Thu, 27 Apr 2023 14:55:00 +0200 MIME-Version: 1.0 References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> Content-Language: en-US From: Daniel Mendler In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) 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: -3.3 (---) On 4/27/23 14:28, Mattias Engdegård wrote: > 27 apr. 2023 kl. 12.42 skrev Daniel Mendler : > >> I think it is >> kind of nice that `nconc' can be used as a tool to turn a proper list >> into an improper list and vice versa. > > It's a bit obscure, though -- Probably. I am not sure if I came up with this pattern independently. It is likely that I've seen it in some other packages. So it is good that this is fixed. > (setcdr (last X) nil) > > is a lot clearer than > > (nconc X nil) > > and when the latter is preferred for performance, a comment might be polite to the reader. The problem is that `setcdr' of `last' is not correct for the empty list. The two lines are not equivalent. > Anyway, a fix has been pushed to master, and the manual entry for `nconc` got an extra example. Thanks. Daniel From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages References: <877cty45rx.fsf@gmail.com> In-Reply-To: <877cty45rx.fsf@gmail.com> Resent-From: Maks Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 13:34:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: 63103@debbugs.gnu.org Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168260238812918 (code B ref 63103); Thu, 27 Apr 2023 13:34:01 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 13:33:08 +0000 Received: from localhost ([127.0.0.1]:57964 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps1kC-0003MG-0e for submit@debbugs.gnu.org; Thu, 27 Apr 2023 09:33:08 -0400 Received: from mail-ej1-f42.google.com ([209.85.218.42]:59866) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps1kA-0003Lo-2N for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 09:33:07 -0400 Received: by mail-ej1-f42.google.com with SMTP id a640c23a62f3a-956ff2399c9so1518161966b.3 for <63103@debbugs.gnu.org>; Thu, 27 Apr 2023 06:33:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682602380; x=1685194380; h=mime-version:message-id:date:subject:to:from:from:to:cc:subject :date:message-id:reply-to; bh=wwZw//4Vfw5LrSNyLLUohBxOJltlfuvX8/DX9QX2Y8U=; b=WivmbgTwD+6iilb+f6lT2Q0MTHbuDNQ+58mQJnD+FJNWHkuozzzpmsb015HBUmN+mj HXc5mSpGWp7zh0tlnbeavbSCR/dGw87U+N0j08c0V+hWJsuG/l4NPTeoMBWosjXZhD80 CRlrehvlN/5DTeu5ygTfDnZq2JsyyXfWLuvXjU/SvhisoTwc2KB3rV3LJxooyy6losYz ULo3kqTczFpMlWts0s5fpe7QiniI2M+xUlqAzA3F3L4pj5MLM8JMlg41TdS3l7hRtjBP pcvDeREIt8DER0aTwWaC2KdyqwNbO5CafG5THPfYfRkEXn++HpQeu+SqvRZkAk6p2VjL LU5g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682602380; x=1685194380; h=mime-version:message-id:date:subject:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=wwZw//4Vfw5LrSNyLLUohBxOJltlfuvX8/DX9QX2Y8U=; b=NqFZOxEN2SAHvzs+rgxKou8Mt86r9Huwe1XlTHaPRrJQRbGx4gAoVc0aDFyWUcisBh RxOGHMaHYb+ApyR6lxjoOLMBUPEhx/V9xdXoqZCC51iSEOdkl/TyxUSzA2r4gJwe59A7 nuV7SqtKAAep+voE4J+OJzXkV0g/vpMQYUrnKyqK1rNzl5iIPQYoatxGW2MS/LEOOMsM cJsqCY9fqws6/rwxaJQBXL2IHEM1MuC/Rp6wgBNgrAzxy4IHnKk47iVPU1qX/yt3E8Hx jTrDvRtOsOYnPUvdHu1I4M2BkphylnNePhvXKj3cXULq+lzykyP5MeZLglxrjMUVvcaL KGBQ== X-Gm-Message-State: AC+VfDwyzwCpaABbSMbu2XlntNCCflCbTcQcofyO7tNGoGLwHvZZ+IAB cnvczioUerDU7OI89V2E09+wYqkLrF0= X-Google-Smtp-Source: ACHHUZ5wF1UrRQggIQQ7JrXCatmkfPcE5LvifwPH1jVeoaTGRjI07Yh//cVehaEwsUFZUtPugMhPAA== X-Received: by 2002:a17:907:7b9b:b0:94f:3f92:c7b0 with SMTP id ne27-20020a1709077b9b00b0094f3f92c7b0mr1780759ejc.60.1682602379659; Thu, 27 Apr 2023 06:32:59 -0700 (PDT) Received: from pop-os (78-152-187-146.pool.ic.km.ua. [78.152.187.146]) by smtp.gmail.com with ESMTPSA id jx17-20020a170907761100b0094f698073e0sm9620182ejc.123.2023.04.27.06.32.59 for <63103@debbugs.gnu.org> (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Apr 2023 06:32:59 -0700 (PDT) From: Maks Date: Thu, 27 Apr 2023 16:32:37 +0300 Message-ID: <87o7n9pi16.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain 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 (-) Thanks for the fix, it works! From unknown Tue Aug 19 06:31:05 2025 X-Loop: help-debbugs@gnu.org Subject: bug#63103: 30.0.50; nconc compiler optimization breaks user packages Resent-From: Drew Adams Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 13:56:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Daniel Mendler , Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Cc: Philip Kaludercic , Stefan Monnier , "63103@debbugs.gnu.org" <63103@debbugs.gnu.org> Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168260371225161 (code B ref 63103); Thu, 27 Apr 2023 13:56:02 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 13:55:12 +0000 Received: from localhost ([127.0.0.1]:57998 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps25Y-0006Xk-24 for submit@debbugs.gnu.org; Thu, 27 Apr 2023 09:55:12 -0400 Received: from mx0b-00069f02.pphosted.com ([205.220.177.32]:8354) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps25T-0006Wx-N1 for 63103@debbugs.gnu.org; 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nconc compiler optimization breaks user packages Resent-From: Daniel Mendler Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 27 Apr 2023 14:03:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 63103 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: To: Drew Adams , Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Cc: Philip Kaludercic , Stefan Monnier , "63103@debbugs.gnu.org" <63103@debbugs.gnu.org> Received: via spool by 63103-submit@debbugs.gnu.org id=B63103.168260415727408 (code B ref 63103); Thu, 27 Apr 2023 14:03:02 +0000 Received: (at 63103) by debbugs.gnu.org; 27 Apr 2023 14:02:37 +0000 Received: from localhost ([127.0.0.1]:59439 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps2Cj-00077z-2R for submit@debbugs.gnu.org; Thu, 27 Apr 2023 10:02:37 -0400 Received: from server.qxqx.de ([178.63.65.180]:33049 helo=mail.qxqx.de) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ps2Cf-00077g-0P for 63103@debbugs.gnu.org; Thu, 27 Apr 2023 10:02:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=qxqx.de; s=mail1392553390; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=6nCO0fvbfj1r1szrKq90ULOfZEz3y6D3DFUJ7mWSAac=; b=zXMwy/Nc6vONY+/wSp2ykQQUnx IfmD6ZuPXH+xsL+9M85tHmQG2rws7yJZV8oYLWJA0onyw/2OHQWQBmpQ3FWxfB5hEIMqVAy8MhKEE ddt41H2L+hMS2IrtKTus+1s/Med67zTdWD704Wf7Y+AT/YU9HkG8eflbL7zNlGgTikHc=; Message-ID: <00a455d5-8c78-7d5d-0239-849bd4f60098@daniel-mendler.de> Date: Thu, 27 Apr 2023 16:02:22 +0200 MIME-Version: 1.0 References: <877cty45rx.fsf@gmail.com> <871qk5516v.fsf@posteo.net> <9DCB2C69-7C1E-48A0-8AE2-BD8B1C0E3A80@acm.org> <679f4102-4e3f-656f-18d9-4a3cc68ce595@daniel-mendler.de> Content-Language: en-US From: Daniel Mendler In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Score: -2.3 (--) 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: -3.3 (---) On 4/27/23 15:54, Drew Adams wrote: >> Well, my assumption didn't completely stand on its own. Given that the >> last argument can be a non-list suggests that the last argument is not >> inspected or mutated, but just overwrites the cdr of the second to last >> argument. This then implies that the second to last argument could also >> be an improper list. Given that CL and Elisp have behaved like this for >> a long time, it seems better to preserve this property. I think it is >> kind of nice that `nconc' can be used as a tool to turn a proper list >> into an improper list and vice versa. It may be good to document this in >> the `nconc' docstring and the Elisp manual. > > +1. > > You both agree that this behavior (1) shouldn't be > lost and (2) should be documented. That's exactly > the position taken by Common Lisp. > > Please document this behavior as part of the bug > fix, if you haven't already. Mattias already documented the behavior for dotted lists in the Elisp manual and added a regression test. See commit 5ead8c5f69b0a69bac4641d5003ee422d6b67038. Daniel