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=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!news.stack.nl!reality.xs3.de!news.jacob-sparre.dk!loke.jacob-sparre.dk!pnx.dk!.POSTED!not-for-mail
From: Jacob Sparre Andersen <jacob@jacob-sparre.dk>
Newsgroups: comp.lang.ada
Subject: Dynamic_Predicate failure -> Assertion_Error?
Date: Tue, 13 May 2014 13:22:27 +0200
Organization: Jacob Sparre Andersen Research & Innovation
Message-ID: <87tx8tncss.fsf@adaheads.sparre-andersen.dk>
NNTP-Posting-Host: 3408ds2-vbr.0.fullrate.dk
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Trace: loke.gir.dk 1399980147 32750 90.184.74.58 (13 May 2014 11:22:27 GMT)
X-Complaints-To: news@jacob-sparre.dk
NNTP-Posting-Date: Tue, 13 May 2014 11:22:27 +0000 (UTC)
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.4 (gnu/linux)
Cancel-Lock: sha1:WDGqu2VFwPIpsK62YHy6mRXeVlM=
Xref: news.eternal-september.org comp.lang.ada:19798
Date: 2014-05-13T13:22:27+02:00
List-Id: <comp.lang.ada>

I am experimenting a bit with GNAT-GPL-2013 and some of the new features
in Ada 2012.

% cat primes.ads
package Primes is
   subtype Prime is Integer range 2 .. Integer'Last
     with Dynamic_Predicate
       => (for all N in 2 .. Prime - 1 => Prime mod N /= 0);
end Primes;
% cat test_primes.adb
with Ada.Assertions,
     Ada.Text_IO;
with Primes;

procedure Test_Primes is
   use Primes;
   P : Prime;
begin
   for I in 1 .. 25 loop
      begin
         P := I;
         Ada.Text_IO.Put_Line (Prime'Image (P) & " is a prime.");
      exception
         when Constraint_Error =>
            Ada.Text_IO.Put_Line (Integer'Image (I) &
                                  " is not a prime (constraint).");
         when Ada.Assertions.Assertion_Error =>
            Ada.Text_IO.Put_Line (Integer'Image (I) &
                                  " is not a prime (predicate).");
      end;
   end loop;
end Test_Primes;
% gnatmake -gnat12 -gnata -gnato -fstack-check test_primes
gcc -c -gnat12 -gnata -gnato -fstack-check test_primes.adb
gcc -c -gnat12 -gnata -gnato -fstack-check primes.ads
gnatbind -x test_primes.ali
gnatlink test_primes.ali -fstack-check
% ./test_primes
 1 is not a prime (constraint).
 2 is a prime.
 3 is a prime.
 4 is not a prime (constraint).
[...]

As I read 3.2.4(31/3) the raised exception for 4 should be
Assertion_Error and not Constraint_Error.  Is this correct?

If I am correct, is there any likelihood that I could get a test for
this into ACATS (assuming that I can figure out how to formulate it
properly)?

Greetings,

Jacob
-- 
"I don't want to gain immortality in my works.
 I want to gain it by not dying."