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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Overloading operator "=" for anonymous access types?
Date: Tue, 15 Jan 2019 11:15:26 +0000
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daicrkk@googlemail.com writes:

>   if Standard."="(L, null) or Standard."="(R, null) then    -- universal =
>     return Standard."="(L, R);                              -- universal =

In my copy of Barnes's book (Programming in Ada 2012) in 11.7, at the
top of p.214, this is stated as the version required by Ada 2005 and to
be "a bit ugly".

One would rather be ugly than wrong.