From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Xu Chunyang Newsgroups: gmane.emacs.bugs Subject: bug#36418: 26.2.90; mapconcat "SEPARATOR must be a string." is incorrect Date: Fri, 28 Jun 2019 21:23:24 +0800 Message-ID: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="157677"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Emacs/26.2.90 To: 36418@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Fri Jun 28 16:02:36 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hgrSV-000erW-O1 for geb-bug-gnu-emacs@m.gmane.org; Fri, 28 Jun 2019 16:02:36 +0200 Original-Received: from localhost ([::1]:60256 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hgrSU-0000I8-BB for geb-bug-gnu-emacs@m.gmane.org; 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Fri, 28 Jun 2019 09:23:27 -0400 (EDT) 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: 209.51.188.43 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:161720 Archived-At: C-h f mapconcat says > SEPARATOR must be a string. but nil works fine (mapconcat #'identity '("a" "b") nil) ;; => "ab" and `string-join` relies on this fact (by the way, string-join's docstring doesn't explain the case when separator is omitted or nil) (defsubst string-join (strings &optional separator) "Join all STRINGS using SEPARATOR." (mapconcat 'identity strings separator)) C-h S mapconcat says > SEPARATOR, which also must be a string, or a vector or list of > characters. C-h f concat says > Each argument may be a string or a list or vector of characters (integers).