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Newsgroups: comp.lang.ada
Date: Mon, 11 Sep 2017 15:48:25 -0700 (PDT)
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Subject: Re: Type invariants and private extensions?
From: Shark8 <onewingedshark@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:48025
Date: 2017-09-11T15:48:25-07:00
List-Id: <comp.lang.ada>

On Monday, September 11, 2017 at 3:27:54 PM UTC-6, Victor Porton wrote:
>
> package P1 is
> 
    type T1 is new T with private;
  PRIVATE
>   type T1 is new T with null record
>     with Type_Invariant => True;
> 
> end P1;
> 
> 
> $ gnatgcc -gnatc -c p1.ads 
> p1.ads:6:10: aspect "Type_Invariant" only allowed for private type or 
> corresponding full view

The error-message is telling you that "Type_Invariant" is only applicable to private-types, or the full-view of a private-type.