From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00,MAILING_LIST_MULTI
	autolearn=unavailable autolearn_force=no version=3.4.4
X-Google-Thread: 103376,d3da40ad8c16665,start
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news3.google.com!news.glorb.com!news.tele.dk!feed118.news.tele.dk!news.tele.dk!small.news.tele.dk!news.astraweb.com!newsrouter-eu.astraweb.com!proxad.net!cleanfeed1-b.proxad.net!nnrp7-2.free.fr!not-for-mail
Return-Path: <Christoph.Grein@eurocopter.com>
Date: Tue, 16 Jan 2007 12:06:30 +0100
From: "Grein, Christoph (Fa. ESG)" <Christoph.Grein@eurocopter.com>
Subject: WG: Structured exception information
To: comp.lang.ada@ada-france.org
MIME-version: 1.0
X-MIMEOLE: Produced By Microsoft Exchange V6.5
Content-Type: text/plain; charset=us-ascii
Content-transfer-encoding: 7BIT
Content-class: urn:content-classes:message
Thread-topic: Structured exception information
Thread-index: Acc5TkIcT0ZJIx+pTeWNxsrSDi+e7QADZRcwAACRNrA=
X-MS-Has-Attach: 
X-MS-TNEF-Correlator: 
X-OriginalArrivalTime: 16 Jan 2007 11:07:17.0231 (UTC)
	FILETIME=[7BEEDFF0:01C7395E]
X-Virus-Scanned: amavisd-new at ada-france.org
X-BeenThere: comp.lang.ada@ada-france.org
X-Mailman-Version: 2.1.9rc1
Precedence: list
List-Id: "Gateway to the comp.lang.ada Usenet newsgroup"
	<comp.lang.ada.ada-france.org>
List-Unsubscribe: <http://www.ada-france.org/mailman/listinfo/comp.lang.ada>,
	<mailto:comp.lang.ada-request@ada-france.org?subject=unsubscribe>
List-Post: <mailto:comp.lang.ada@ada-france.org>
List-Help: <mailto:comp.lang.ada-request@ada-france.org?subject=help>
List-Subscribe: <http://www.ada-france.org/mailman/listinfo/comp.lang.ada>,
	<mailto:comp.lang.ada-request@ada-france.org?subject=subscribe>
Newsgroups: comp.lang.ada
Message-ID: <mailman.24.1168945740.18371.comp.lang.ada@ada-france.org>
X-Leafnode-NNTP-Posting-Host: 88.191.17.134
Organization: Guest of ProXad - France
NNTP-Posting-Date: 16 Jan 2007 12:10:02 MET
NNTP-Posting-Host: 88.191.14.223
X-Trace: 1168945802 news-3.free.fr 22780 88.191.14.223:40924
X-Complaints-To: abuse@proxad.net
Xref: g2news2.google.com comp.lang.ada:8162
Date: 2007-01-16T12:10:02+01:00

Note that the full type need not have a discriminant:

    package P is
      type T (<>) is private;
      function Constructor (S: String) return T;
    private
      type T is record
        null;
      end record;
    end P;

Your program seems correct with a little change, however return of
limited
types is not yet implemented in Gnat:

private with Ada.Finalization;
package P is
  type T (<>) is limited private;
  function Constructor (S: String) return T;
private
  type T (I: Integer) is new Ada.Finalization.Limited_Controlled with
    record
      null;
    end record;
end P;
package body P is
  function Constructor (S: String) return T is
  begin
    return (Ada.Finalization.Limited_Controlled with I => 0);
  end Constructor;
end P;
with P;
procedure Hello is
  X: P.T := P.Constructor ("some params");
begin
  null;
end Hello;