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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Discriminant and type extensions
Date: Mon, 5 Oct 2009 16:08:23 -0700 (PDT)
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On Oct 5, 3:34=A0pm, Yannick Duch=EAne Hibou57 <yannick_duch...@yahoo.fr>
wrote:
> Re- Not legal, the compiler don't want this

Referring to the example where you removed the genericity:

If you put this on *both* the private and full declarations of
Extension_Type:

  type Extension_Type (Discriminant : Natural) is
     new P1.T_Type (Discriminant =3D> Discriminant)

then take the (Discriminant =3D> Discriminant) off the *private*
extension declaration.  I.e.:

  type Extension_Type (Discriminant : Natural) is
     new P1.T_Type
     with private;

But leave it on the full declaration:

  type Extension_Type (Discriminant : Natural) is
     new P1.T_Type (Discriminant =3D> Discriminant)
     with null record;

See if that works.

The reason has to do with a rule about statically matching
constraints.  See AARM 7.3(13.e), at http://www.adaic.org/standards/05aarm/=
html/AA-7-3.html
-- look for paragraph 13.e.

                                    -- Adam