From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.5-pre1 (2020-06-20) on
	ip-172-31-74-118.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=0.0 required=3.0 tests=BAYES_20,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.5-pre1
X-Received: by 2002:a37:c202:: with SMTP id i2mr869252qkm.296.1619718232018;
        Thu, 29 Apr 2021 10:43:52 -0700 (PDT)
X-Received: by 2002:a25:6d02:: with SMTP id i2mr979125ybc.309.1619718231801;
 Thu, 29 Apr 2021 10:43:51 -0700 (PDT)
Path: eternal-september.org!reader02.eternal-september.org!weretis.net!feeder8.news.weretis.net!proxad.net!feeder1-2.proxad.net!209.85.160.216.MISMATCH!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail
Newsgroups: comp.lang.ada
Date: Thu, 29 Apr 2021 10:43:51 -0700 (PDT)
In-Reply-To: <5990d990-d8fc-489c-bb5d-7f047e14e06an@googlegroups.com>
Injection-Info: google-groups.googlegroups.com; posting-host=94.31.102.170; posting-account=rmHyLAoAAADSQmMWJF0a_815Fdd96RDf
NNTP-Posting-Host: 94.31.102.170
References: <78fd99c3-538d-4981-af11-c1885df36575n@googlegroups.com>
 <7e2ece3d-893c-43fb-bf81-6002dbd0bc3dn@googlegroups.com> <e05ca45e-a201-43e7-8397-0b3f7089b2d0n@googlegroups.com>
 <56dc220e-1341-4a9f-98cc-132c8afdc2afn@googlegroups.com> <5990d990-d8fc-489c-bb5d-7f047e14e06an@googlegroups.com>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <a1ac3062-0bdb-417a-98e5-8f82c74a5126n@googlegroups.com>
Subject: Re: [Ada95] Private non-generic children of generics not allowed
From: AdaMagica <christ-usch.grein@t-online.de>
Injection-Date: Thu, 29 Apr 2021 17:43:52 +0000
Content-Type: text/plain; charset="UTF-8"
Xref: reader02.eternal-september.org comp.lang.ada:61931
List-Id: <comp.lang.ada>

So what you want is an implicit instantiation as outlined below:

generic
package Gen is
end Gen;
package body Gen is
  procedure Proc is separate;
end Gen;

private package Gen.Priv is  -- will be implicitly instantiated
end Gen.Priv;

with Gen.Priv;
separate (Gen)
procedure Proc is
begin
  ...Priv.XXX...  -- anything from Priv
end Proc;

This is not very far from the solution given by ehh.