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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: constructor in abstract tagged types
Date: Fri, 10 May 2019 17:35:46 -0500
Organization: JSA Research & Innovation
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Xref: reader01.eternal-september.org comp.lang.ada:56287
Date: 2019-05-10T17:35:46-05:00
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"Jere" <jhb.chat@gmail.com> wrote in message 
news:58f49c83-eb9d-40d7-9c90-a9523167f63a@googlegroups.com...
...
> GNAT accepts:
>
>   function F_Build(Years : Natural) return Son is
>   begin
>      return (Years => Years, Skate => True, others => <>);
>   end F_Build;
>
> I assume since it is abstract you don't have to lead with "Father with"
> in the aggregate initialization.

It's because the type is fully visible. That's not the usual case for Ada 
abstractions, of course, which is why the extension aggregate is available.

                                  Randy.