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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Prologue and epilogue aspects
Date: Sat, 27 Jan 2018 01:17:17 -0600
Organization: JSA Research & Innovation
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:p4g15r$1s60$1@gioia.aioe.org...
...
>    type Controlled is abstract new <anonymous> with private;

This unfortunately doesn't fix anything. An interface never can be hidden 
(only in the private part), and deriving a concrete type from an interface 
doesn't change that.

We tried to define a special kind of interface that could be used in the 
private part in exchange for a promise never to add such an interface to a 
descendant of the private type. It didn't work out very well.

                              Randy.