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From: christoph.grein@eurocopter.com
Newsgroups: comp.lang.ada
Subject: Re: Why constructing functions is a mess [was Language lawyer
	question: task activation
Date: Tue, 3 Mar 2009 01:27:17 -0800 (PST)
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Date: 2009-03-03T01:27:17-08:00
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On Mar 3, 9:45=A0am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> >>> =A0 =A0package P1 is
> >>> =A0 =A0 =A0 type T1(<>) is abstract tagged limited private;
> >>> =A0 =A0private
> >>> =A0 =A0 =A0 type T1(X: Character) is tagged limited null record;
> >>> =A0 =A0end P1;
>
> >>> =A0 =A0package P2 is
> >>> =A0 =A0 =A0 type T2 is new P1.T1 with private;
> >>> =A0 =A0private
> >>> =A0 =A0 =A0 type T2 is new P1.T1 with null record;
> >>> =A0 =A0 =A0 X: T2 :=3D (P1.T1 with null record); =A0-- Bang!
> >>> =A0 =A0end P2;
> >>> ...
>
> >> However it looks like a bug to me, because T1 is unconstrained.
> >> Nevertheless, GNAT Pro 6.2.1 successfully compiles it.
>
> > No, it doesn't (I *have* GNAT Pro 6.2.1).
>
> > =A0 =A0X: T2 :=3D (P1.T1 with null record);
> > =A0 =A0 =A0 =A0 =A0 =A0 | no value supplied for discriminant "X"
> > gnatmake: "p2.ads" compilation error
>
> Hmm, mine is GNAT Pro 6.2.1 (20090115). Different wavefronts or, maybe,
> platforms?

GNAT Pro 6.2.1 (20090115-43) i686-pc-linux-gnu