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Date: Wed, 13 Sep 2017 11:34:45 -0700 (PDT)
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Subject: Re: Community Input for the Maintenance and Revision of the Ada
 Programming Language
From: Egil H H <ehh.public@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:48107
Date: 2017-09-13T11:34:45-07:00
List-Id: <comp.lang.ada>

On Wednesday, September 13, 2017 at 6:34:43 PM UTC+2, Jeffrey R. Carter wrote:
> 
> No. If you supply a discriminant, the object is constrained to that subtype. 
> Only is you do not supply a discriminant is the object unconstrained.
> 

That's wrong.

"If a discriminated type has default_expressions for its discriminants, then unconstrained variables of the type are permitted, and the values of the discriminants can be changed by an assignment to such a variable."
See RM 3.7 (28)
http://www.ada-auth.org/standards/rm12_w_tc1/html/RM-3-7.html