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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2005 puzzle
Date: Tue, 24 Jul 2012 09:54:17 +0200
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Date: 2012-07-24T09:54:17+02:00
List-Id: <comp.lang.ada>

On Mon, 23 Jul 2012 21:23:50 -0700 (PDT), Adam Beneschan wrote:

> On Monday, July 23, 2012 7:38:30 PM UTC-7, Randy Brukardt wrote:
>>>
>>> I don't understand that, I am not a language lawyer. You are. Is my example
>>> legal and GNAT wrong? In case it is illegal, then how do I change the
>>> aggregate to make it legal.
>> 
>> The example you have is illegal. But the reason it is illegal is not because 
>> there are any semantic problems with the construct -- it's illegal purely 
>> because it is difficult to implement on some compilers.
> 
> Just to forestall any possible confusion: I think Dmitry's example *would*
> be illegal if it didn't involve a null extension.  But since his original
> post did involve a null extension, I think the example in his post was
> legal and GNAT was wrong.  I'm guessing, though, that Dmitry probably
> started with a non-null type extension and just understandably simplified
> it too far.

Exactly.

I repeat it again. It is not about any concrete example. It is about the
principle that constructing function would allow writing an aggregate for a
derived type.

[where the later is fully visible of course, when only abstract ancestors
extended by null record are in between. Put whatever *rational*
restrictions here].

If it does not, then I really fail to understand the purpose of.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de