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From: Lawrence D'Oliveiro <ldo@nz.invalid>
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Subject: Re: Reduction expressions
Date: Wed, 21 Aug 2024 01:37:22 -0000 (UTC)
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On Tue, 20 Aug 2024 16:41:55 -0700, Keith Thompson wrote:

> A subtype with no added constraint is similar to a C typedef, but given
> 
>     subtype Digit is Integer range 0..9;
> 
> Digit is distinct from Integer (though they're both the same type).

“Integer range 0..9” is a subtype of Integer, and is valid for example as 
a return type where Integer is expected. The “subtype” declaration doesn’t 
actually create the subtype: “Digit” is just a shorthand name for that, 
just like a C typedef.