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From: Martin <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: Extending discriminant types
Date: Tue, 25 Nov 2008 02:37:51 -0800 (PST)
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On Nov 24, 10:16=A0pm, a...@anon.org (anon) wrote:
[snip]
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0-- Replacing T with Integer wi=
ll still result in an error
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0-- for the 83 specs. Because B=
ase is not an attribute
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0-- in Ada 83.
> =A0 function "=3D" ( Left, Right : T'Base ) return Boolean ;

That's not legal Ada83.

Look at Appendix A:

    * P'BASE
      For a prefix P that denotes a type or subtype:

                  This attribute denotes the base type of P.   It  is
only
                  allowed  as  the prefix of the name of another
attribute:
                  for example, P'BASE'FIRST.  (See 3.3.3.)

You can't ever use 'Base on its own in Ada83.

Cheers
-- Martin