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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT bug with assertions
Date: Fri, 10 Aug 2018 15:42:22 -0500
Organization: JSA Research & Innovation
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"Simon Wright" <simon@pushface.org> wrote in message 
news:lyd0uqyz76.fsf@pushface.org...
...
> IMO this is a bug in GNAT, present in CE2018 and FSF GCC 8 (and maybe
> earlier, didn't check).

Looks likely (I didn't check the wording to be certain). Predicate checks 
should occur any time there is a conversion of an entire object to the 
appropriate subtype, and that should happen in a return statement.

                                        Randy.