From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philipp Stephani Newsgroups: gmane.emacs.bugs Subject: bug#47391: 27.2; static list return from function and nconc Date: Thu, 25 Mar 2021 16:28:26 +0100 Message-ID: References: <87r1k32sir.fsf@hm.sivalik.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20866"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 47391@debbugs.gnu.org, Emacs developers To: Rajeev Narang Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Mar 25 16:29:59 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1lPRvr-0005Kc-3G for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 25 Mar 2021 16:29:59 +0100 Original-Received: from localhost ([::1]:60348 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lPRvq-0004iK-5S for geb-bug-gnu-emacs@m.gmane-mx.org; 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M=C3=A4rz 2021 um 16:23 Uhr schrieb Rajeev Narang via Bug reports for GNU Emacs, the Swiss army knife of text editors : > > (defun fn () '(1 2)) > > (nconc (fn) '(3)) > -> (1 2 3) This is undefined behavior/unsupported. The value that (fn) evaluates to is immutable, but nconc mutates it. > > (nconc (fn) '(3)) > -> (1 2 3 3) ? should be (1 2 3) > > If this is not a bug, then hfy-invisible, hfy-face-to-style-i may need to= be fixed. If they use this pattern, then they should indeed be fixed.