From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.help Subject: Re: Elisp string function question Date: Fri, 18 Jun 2021 17:23:56 +0300 Message-ID: <83r1gzxncz.fsf@gnu.org> References: <20210618121807.xsjdbv4ouqbv4uex.ref@Ergus> <20210618121807.xsjdbv4ouqbv4uex@Ergus> <83v96bxsc6.fsf@gnu.org> <87zgvn47to.fsf@gmail.com> <83sg1fxp0d.fsf@gnu.org> <87v96b46g0.fsf@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11558"; mail-complaints-to="usenet@ciao.gmane.io" To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jun 18 16:24:13 2021 Return-path: Envelope-to: geh-help-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 1luFPp-0002lk-B8 for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Jun 2021 16:24:13 +0200 Original-Received: from localhost ([::1]:47978 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1luFPo-0006zS-Do for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 18 Jun 2021 10:24:12 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53090) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1luFPT-0006zF-FL for help-gnu-emacs@gnu.org; Fri, 18 Jun 2021 10:23:51 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:50396) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1luFPT-0001ZX-8F for help-gnu-emacs@gnu.org; Fri, 18 Jun 2021 10:23:51 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:4045 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 1luFPS-0007wk-Ru for help-gnu-emacs@gnu.org; Fri, 18 Jun 2021 10:23:51 -0400 In-Reply-To: <87v96b46g0.fsf@gmail.com> (message from Robert Pluim on Fri, 18 Jun 2021 16:02:07 +0200) X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:130980 Archived-At: > From: Robert Pluim > Cc: help-gnu-emacs@gnu.org > Date: Fri, 18 Jun 2021 16:02:07 +0200 > > >> Then itʼs buggy: > >> > >> (let ((s (make-symbol ""))) > >> (string-empty-p s)) > >> => t > > Eli> Is it? What is the name of the symbol created there? > > The name is "", but the symbol itself has no value, so string-empty-p > should not say t But if the documentation will say that string-empty-p accepts symbols and uses their name, then the name of this symbol _is_ empty. > (let ((s (make-symbol ""))) > (message s)) > => > Debugger entered--Lisp error: (wrong-type-argument stringp ##) > message(##) > (let ((s (make-symbol ""))) (message s)) > (progn (let ((s (make-symbol ""))) (message s))) > eval((progn (let ((s (make-symbol ""))) (message s))) t) > > Compare this with: > > (let ((s "")) > (string-empty-p s) => t > (message "string '%s'" s)) => no complaints from 'message' This is because 'message' does NOT allow symbols as its first argument.