https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60517

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-08-22
     Ever confirmed|0                           |1

--- Comment #16 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Note that we still do not warn for my original testcase.
>From gcc-bugs-return-459044-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Aug 22 13:20:37 2014
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From: "demoonlit at panathenaia dot halfmoon.jp" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/62230] New: Legal program rejected, RM 4.3.2(3, 5/3), ancestor_part can not be expression against error message by compiler itself
Date: Fri, 22 Aug 2014 13:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idb230

            Bug ID: 62230
           Summary: Legal program rejected, RM 4.3.2(3, 5/3),
                    ancestor_part can not be expression against error
                    message by compiler itself
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: demoonlit at panathenaia dot halfmoon.jp

Created attachment 33380
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id3380&actioníit
minimal bug triggering source code

GNAT rejects any expressions implying aggregate for ancestor_part.

For example: (Please see the attachment file, also)
   type T1 is limited new Ada.Finalization.Limited_Controlled with null record;
   type T2 is new T1 with null record;
   X : T2 := (T1 with null record); -- OK
   Z : T2 := (T1'(Ada.Finalization.Limited_Controlled with null record) with
null record); -- ERROR

GNAT outputs:
    main.adb:23:09: limited ancestor part must be aggregate or function call

It seems for me that aggregate expression is allowed into ancestor_part
according to the error message outputted by GNAT itself. But, it is not.

And, RM 4.3.2(3, 5/3) allows it explicitly.