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: How to test for native JSON support? Date: Tue, 04 May 2021 15:16:03 +0300 Message-ID: <838s4u66f0.fsf@gnu.org> References: <87k0ohuybx.fsf@fastmail.fm> <785b4132-da32-0da8-519d-b39a58270f32@gmail.com> <87y2cuybeu.fsf@passepartout.tim-landscheidt.de> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37680"; 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 Tue May 04 14:23:19 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 1ldu55-0009eb-Sc for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 04 May 2021 14:23:15 +0200 Original-Received: from localhost ([::1]:35352 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ldu54-0004Lp-Li for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 04 May 2021 08:23:14 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52160) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ldtyT-0000eA-SG for help-gnu-emacs@gnu.org; Tue, 04 May 2021 08:16:27 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:50339) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ldtyN-0002Xj-Et for help-gnu-emacs@gnu.org; Tue, 04 May 2021 08:16:22 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:2373 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1ldtyL-0003N4-8x for help-gnu-emacs@gnu.org; Tue, 04 May 2021 08:16:18 -0400 In-Reply-To: <87y2cuybeu.fsf@passepartout.tim-landscheidt.de> (message from Tim Landscheidt on Tue, 04 May 2021 11:40:41 +0000) 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:129419 Archived-At: > From: Tim Landscheidt > Date: Tue, 04 May 2021 11:40:41 +0000 > > Nikolay Kudryavtsev wrote: > > > json-serialize would return nil if libjansson library is not > > available during the execution time. So the scenario would > > be someone building Emacs with json support, then forgetting > > to put libjansson on his path and/or moving the binary to > > another machine. Not very likely to happen on any POSIX > > systems, but a more or less tangible case on Windows. > > That's a rather unexpected, at least undocumented failure > mode (vulgo: a bug). IMNSHO in that case json-serialize > should either "work" or throw an error. It actually displays an error message, in addition to returning nil (as do all other JSON primitives in that case).