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From: Reto Buerki <reet@codelabs.ch>
Newsgroups: comp.lang.ada
Subject: Discriminant & interface not implemented by full type
Date: Mon, 09 Mar 2009 18:21:34 +0100
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Date: 2009-03-09T18:21:34+01:00
List-Id: <comp.lang.ada>

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