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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Potential Coextension Bug in GNAT
Date: Thu, 20 Dec 2018 20:16:09 -0600
Organization: JSA Research & Innovation
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Date: 2018-12-20T20:16:09-06:00
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"Simon Wright" <simon@pushface.org> wrote in message 
news:lyefacdtn8.fsf@pushface.org...
> Jere <jhb.chat@gmail.com> writes:
>
>> I was messing around and trying to learn coextensions and
>> I came across some counter intuitive functionality.  If I
>> directly initialize one via an aggregate, it works fine.
>> However, if I initialize through a constructing function,
>> it seems to treat the access discriminant as a normal access
>> type and finalizes it at the end of the program instead of
>> when the object leaves scope.
>
> Compiling with -gnatwa I see "warning: coextension will not be finalized
> when its associated owner is deallocated or finalized", so GNAT clearly
> meant to do it!

This message is nonsense, because a coextension is effectively part of the 
associated object. What they presumably mean to say is that the declaration 
in question is *not* a coextension, thus it will not be finalized with the 
owner.

                             Randy.

P.S. I hate coextensions. One of the least necessary complications of Ada. 
(Janus/Ada gives you a "feature not implemented" message if you try to 
create one.)