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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Community Input for the Maintenance and Revision of the Ada
 Programming Language
Date: Mon, 2 Oct 2017 21:14:00 +0200
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Date: 2017-10-02T21:14:00+02:00
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On 10/02/2017 06:23 PM, reinert wrote:
> 
> I thought "x in a..b" was (should be?) short for "a <= x and x <= b"
> (where x, a and b are elements in a (strict) linearly ordered set or so).

No, "in" checks whether a value is a member of a subtype:

value in subtype_name

value in Low .. High

is shorthand for

value in Subtype_Name range Low .. High

where Subtype_Name is a scalar subtype. This is itself shorthand for

subtype anonymous is Subtype_Name range Low .. High;

value in anonymous

Note that you can do

type T (D : Boolean) is private;
subtype TF is T (D => False);
subtype TT is T (D => True);

V : T (D => Boolean'Value (Get_Line) );

if V in TT then

-- 
Jeff Carter
"He nevere yet no vileynye ne sayde
In al his lyf unto no maner wight."
Canterbury Tales
156