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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Creating several types from a base type and conversion
Date: Sat, 18 Jan 2020 20:34:10 +0000
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Date: 2020-01-18T20:34:10+00:00
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> writes:

> On 1/18/20 7:20 PM, Bill Findlay wrote:

>> type word is mod 2**30;
>>
>> subtype word_shift_length is Natural range 0..30;
>>
>> function shift_word_left (W : word; amount : word_shift_length)
>> return KDF9.word;

> I don't know what KDF9.Word is, but surely you have to implement
> these. Or are you saying GNAT magically implements them?

It doesn't; 'with Import, convention => Intrinsic' requires the first
argument to have size 8, 16, 32, or 64, and the second argument must be
Natural (not a subtype of it, even if unconstrained).