From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: "J-P. Rosen" Newsgroups: comp.lang.ada Subject: Re: 'Class'Class'Class'Class ad libitum Date: Tue, 13 Sep 2016 13:29:39 +0200 Organization: A noiseless patient Spider Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Date: Tue, 13 Sep 2016 11:29:44 -0000 (UTC) Injection-Info: mx02.eternal-september.org; posting-host="45bffd6a911624777cad79aac3181090"; logging-data="18559"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19w6FNo3bK92LfZS8O3waNX" User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 In-Reply-To: Cancel-Lock: sha1:WEOiO3BPuzS21exS6Q/F4O60D0g= Xref: news.eternal-september.org comp.lang.ada:31769 Date: 2016-09-13T13:29:39+02:00 List-Id: Le 13/09/2016 à 12:43, Alejandro R. Mosteo a écrit : > I get why this is legal: > > type X is tagged null record; > > subtype Y is X'Class; > > subtype Z is X'Class'Class'Class'Class; > > But can you think of any legitimate reason to use it besides obfuscation? > I guess this is allowed because nobody cared about complicated rules to forbid it (mainly on the ground that it's useless, but harmless). There are many things like that: T'(T'(T'(X))) X+0+0+0 ... -- J-P. Rosen Adalog 2 rue du Docteur Lombard, 92441 Issy-les-Moulineaux CEDEX Tel: +33 1 45 29 21 52, Fax: +33 1 45 29 25 00 http://www.adalog.fr