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From: G. B. <nonlegitur@nmhp.invalid>
Newsgroups: comp.lang.ada
Subject: Re: [Newbie] doubly constrained array, dumb question
Date: Tue, 27 Feb 2018 17:08:40 -0000 (UTC)
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Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
> On 27/02/2018 02:29, Mehdi Saada wrote:
> 
>> For 8: a class has any sense at all only if there's no dispatching to an
>> inexistent method, and your forbidding some methods would do the same, raise an exception.
> 
> Not in the case of subtypes. For example, the "class" Integer of which 
> Positive is a "member"

Or a subset, rather? All x in Positive are such that
x in Integer, but Positive is not an element of Integer.