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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Discriminant problem
Date: Mon, 30 Aug 2021 20:53:41 -0500
Organization: JSA Research & Innovation
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> wrote in message 
news:sgjkj4$kn4$1@dont-email.me...
> On 8/29/21 8:51 PM, Simon Wright wrote:
>>
>> the compiler says
>>
>>     value for discriminant "Node_Test" must be static
>>     non-static function call (RM 4.9(6,18))
>
> This has always been the rule for aggregates.

But Ada 202x relaxes it slightly. If the expression has a static nominal 
subtype, and every value in the subtype selects the same variant, then a 
dynamic discriminant is allowed in a aggregate. I don't know if that is what 
is happening here or not; this relaxation doesn't come up that often.

                        Randy.