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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Mon, 11 Mar 2013 16:01:04 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2013-03-11T16:01:04-04:00
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Anh Vo <anhvofrcaus@gmail.com> writes:

> I have read ARM section 3.2.4, Subtype Predicates, I did not see any
> rules prohibiting from using attribute 'Succ as contained in the code
> nipet below. I would expect Prime'Succ (3) return 5 for next prime
> number. However, 4 is returned instead. Is this a correct behavior?

It is standard-conforming behavior.  Prime'Succ is the same as
Prime'Base'Succ.  Many other attributes behave the same way.
This has been true since Ada 83.  For example, Prime'Succ(1000) = 1001,
and does not raise an exception.  Positive'Image (-10) = "-10".

>    subtype Prime is Natural range 1 .. 1000

- Bob