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From: Christoph Grein <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: It seems bug in GNAT with overloading in assignment
Date: Mon, 25 Feb 2002 10:37:12 +0100 (MET)
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Date: 2002-02-25T10:37:12+01:00

This is definitely a Gnat bug, ObjectAda is correct.
Report it to report@gnat.com (not sure whether email address is correct).


> Trying to understand overloading rules I wrote a following test.
> I would like to see what error compiler reported.
> But it didn't report any error. I tried with 3.13p and 3.14p
> for Windows.
> Then I setup ObjectAda to tried with it. ObjectAda
> reported "Ambiguous assignment".
> Finally I removed Dummy parameter from function declaration
> and gnat crashed with message "GNAT BUG DETECTED"
> 
> Here is the test:
> ------ test.adb
> with Ada.Text_IO;
> 
> procedure Test is
> 
>    type Int_A is new Integer;
>    type Int_B is new Integer;
> 
>    type Int_A_Ptr is access all Int_A;
>    type Int_B_Ptr is access all Int_B;
> 
>    function X (Dummy : Integer) return Int_A_Ptr is
>    begin
>       Ada.Text_IO.Put_Line ("First interpretation");
>       return null;
>    end X;
> 
>    function X (Dummy : Integer) return Int_B_Ptr is
>    begin
>       Ada.Text_IO.Put_Line ("Second interpretation");
>       return null;
>    end X;
> begin
>    X (1).all := 1;  -- Ambiguous assignment
> end Test;
Rational messages:
10:36:17 *** X (1).all := 1; is ambiguous
10:36:17 *** X could be (in OVERLOAD) X
10:36:17 *** X could be (in OVERLOAD) X