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From: Per Sandberg <per.sandberg@bredband.net>
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Subject: Re: Discriminant & interface not implemented by full type
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Date: Thu, 12 Mar 2009 07:21:08 +0100
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Date: 2009-03-12T07:21:08+01:00
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Compiles fine with GNATPro 6.2.1
/Per

Reto Buerki wrote:
> Hi everyone,
> 
> I have the following simple test application:
> 
> package Full_View is
> 
>    type Base_Type (Num : Integer) is tagged private;
> 
>    type Base_Interface is interface;
> 
>    type New_Type is new Base_Type (Num => 11) and
>      Base_Interface with private;
> 
> private
>    type Base_Type (Num : Integer) is tagged record
>       My_Number : Integer := Num;
>    end record;
> 
>    type New_Type is new Base_Type (Num => 11) and
>      Base_Interface with null record;
> 
> end Full_View;
> 
> Trying to compile this with gnat gcc 4.3 in Debian/Lenny results in the
> following error:
> full_view.ads:7:09: interface "Base_Interface" not implemented by full
> type (RM-2005 7.3 (7.3/2))
> 
> When removing the (Num => 11) discrimant initialization or the
> Base_Interface interface from the New_Type type extension, the code
> compiles fine.
> 
> Is this a compiler bug? Seems to me that the consistency check of the
> partial and full view of a tagged type covering interfaces does not like
> discriminants.
> 
> Thanks for your help.
> - reto