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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: SPARK Examiner -- visibility of Ada.Strings.Unbounded (and
	probably lots of other packages)
Date: Thu, 26 Mar 2009 08:13:32 -0700 (PDT)
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On Mar 26, 3:50=A0pm, Tim Rowe <spamt...@tgrowe.plus.net> wrote:
> Now that a GPL version of SPARK Examiner has been announced, I suppose
> this group will be getting a flood of queries on how to use it. Well, I
> hope so, because that would indicate a large take-up -- good for
> software as a whole, and presumably what Praxis HIS and AdaCore are
> hoping for.
>
> So let me try to get in ahead of the flood. I'm trying to put my Ada
> learning exercise into SPARK, and I'm using the evaluation version of
> Examiner (and the gnat compiler). I have
> =A0 =A0 with Ada.Strings.Unbounded;
> at the start of a package file, and SPARK Examiner complains:
> =A0 =A0 1 =A0with Ada.Strings.Unbounded;
> =A0 =A0 =A0 =A0 =A0 =A0 ^1
> --- ( =A01) =A0Warning =A0 =A0 =A0 =A0 =A0 : =A01: The identifier Ada is =
either
> undeclared or not
> =A0 =A0 =A0 =A0 =A0 =A0 visible at this point.
>
> I can't work out how to make Ada.Strings.Unbounded visible to examiner.
> Could somebody point me to what I'm missing, please?
>
> Thanks!

I don't think Ada.Strings.Unbounded is part of SPARK. SPARK is a
*subset* of Ada that removes everything not statically provable. By
definition, anything unbounded is not statically provable. I would
even assume that SPARK forbids the entire Ada run-time library (i.e.
package Ada and its children) but presumably provides a replacement
library (perhaps a package SPARK?)

--
Ludovic Brenta.