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From: sjw <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Dispatch on the result still does not work?
Date: Sun, 12 Jul 2009 13:30:07 -0700 (PDT)
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On Jul 12, 6:11=A0pm, AdaMagica <christoph.gr...@eurocopter.com> wrote:
> =A0 X : T'Class :=3D S'(Value);
> begin
> =A0 =A0X :=3D Value; -- Ambiguous?
>
> You know, I'm not a language lawyer, but after the initialization, X
> is constrained to the tag with which it was initialized.
>
> So to me, it should be dispatching as Dmitry expects.

I think GNAT GPL 2009 might just have a problem in this area: this is
accepted

procedure Q is
   X : P.T'Class :=3D P.S'(P.Value);
begin
   X :=3D P.T'(P.Value);

but this fails

procedure Q is
   X : P.T'Class :=3D P.T'(P.Value);
begin
   X :=3D P.S'(P.Value);

saying 'tag-indeterminate expression must have type "T"(RM 5.2 (6))'