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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Preventing private procedure visibility being made public through
 extension
Date: Sun, 20 May 2018 12:22:08 +0100
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Date: 2018-05-20T12:22:08+01:00
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Simon Wright <simon@pushface.org> writes:

> "Randy Brukardt" <randy@rrsoftware.com> writes:
>
>> Ah, a subtype. GNAT has (or had?)a bug having to do with making things
>> visible because of a subtype declaration (I recall someone else
>> running across that and having verified it myself). That's just plain
>> wrong, a subtype has no effect on what's visible in a prefixed call
>> (or anywhere else for that matter, in particular with "use all type").
>>
>> You ought to have an ambiguity if you tried to call Something in the
>> body of More_Derived, but it should be OK in the main subprogram.
>>
>> I'd skip the subtype and just use the real name of the type. And
>> possibly make a bug report to AdaCore.
>> You could also use a traditional call (More_Derived.Something (M, P);)
>> which would avoid the buggy part of GNAT.
>
> Quite right, Randy (GCC 7.1.0, still; has anyone reported this?)

I think it must have been reported, because it's fixed in 8.1.0.