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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT GPL 2011 bug ?
Date: Tue, 7 Feb 2012 07:50:41 -0800 (PST)
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Date: 2012-02-07T07:50:41-08:00
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On Feb 7, 4:05=A0am, David <d.combesdhen...@gmail.com> wrote:
> Hi all,
>
> The compiler accept the line mark by a arrow of the adb bellow and
> refuse the line mark by "****". I think it must not accept the first
> line to. What do you think ?

I agree, it's a bug.  It shouldn't allow a constant L_I to be passed
as an OUT parameter.

                      -- Adam
>
> Thanks
>
> ------- =A0ads =A0--------
>
> =A0 type I is interface;
>
> =A0 =A0procedure set (Self =A0: =A0 =A0out I;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Value : in =A0 =A0 Natural=
) is abstract;
>
> =A0 =A0type A is abstract tagged null record;
>
> =A0 =A0procedure set (Self =A0: =A0 =A0out A;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Value : in =A0 =A0 Natural=
) is abstract;
>
> =A0 =A0type Implement_I is new I with null record;
>
> =A0 =A0overriding procedure set (Self =A0: =A0 =A0out Implement_I;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 Value : in =A0 =A0 Natural) is
> null;
>
> =A0 =A0Null_Implement_I : constant Implement_I :=3D Implement_I'(null
> record);
>
> =A0 =A0type Implement_A is new A with null record;
>
> =A0 =A0overriding procedure set (Self =A0: =A0 =A0out Implement_A;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0Value : in =A0 =A0 Natural) is null;
>
> =A0 =A0Null_Implement_A : constant Implement_A :=3D Implement_A'(null
> record);
>
> =A0 =A0procedure Test;
>
> --- =A0 adb =A0 ---
>
> procedure Test
> is
> =A0 =A0L_I =A0 : constant test.I'Class =A0 =A0:=3D Null_Implement_I;
> =A0 =A0L_A : constant test.A'Class =A0 :=3D Null_Implement_A;
> begin
> =A0 =A0L_I.set (Value =3D> 2); <--------
> =A0 =A0L_A.set (Value =3D> 2); *******
> end;