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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Discriminants of tagged types
Date: Wed, 27 Oct 2010 22:28:02 +0100
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Robert A Duff <bobduff@shell01.TheWorld.com> writes:

> That doesn't sound right.  What does your example look like, and what
> compiler compiled it without error?

This compiles without complaint with GNAT GPL 2010 & GCC 4.5.0:

   package Privately_Tagged is
      type T (X : Integer := 42) is private;
   private
      type T (X : Integer := 42) is tagged null record;
   end Privately_Tagged;

(and so does your example).