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From: Robert A Duff <bobduff@world.std.com>
Subject: Re: What is wrong here? (Generic and controlled types)
Date: 2000/04/04
Message-ID: <wcc7ledkf8j.fsf@world.std.com>#1/1
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Sender: bobduff@world.uucp (Robert A Duff)
References: <38E871E6.8D9EBE71@lufmech.rwth-aachen.de>
 <8caebe$6us$1@nnrp1.deja.com> <8cahmn$apq$1@nnrp1.deja.com>
Organization: The World Public Access UNIX, Brookline, MA
Newsgroups: comp.lang.ada
Date: 2000-04-04T00:00:00+00:00
List-Id: <comp.lang.ada>

Robert Dewar <robert_dewar@my-deja.com> writes:

> P.S. it is hard to see how the GNAT message could be any
> clearer, suggestions welcome!

I'm not sure it's possible -- the accessibility rules seem to be
inherently difficult to understand.  We totally rewrote that section of
the RM several times, and people found it confusing every time.  I think
the terminology we ended up with is just whatever it happened to be when
the RM was done -- if we had had more time, we probably would have
rewritten it again, without improvement.  ;-)

Part of the problem is that people don't think of the main procedure as
being a real procedure -- its stack frame lasts more-or-less forever,
just like library packages (unless you have tasks or a recursive main
procedure, which is unlikely in a simple test program).

But anyway, how about something like this:

     >>> instantiation error at generic_vectors.ads:75
     >>> controlled type must be declared at the library level
     >>> Move instantiation out of procedure Main and into a library package.

- Bob