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From: Gautier write-only <gautier_niouzes@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Subtypes boundaries
Date: Mon, 14 Jun 2010 14:01:17 -0700 (PDT)
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Date: 2010-06-14T14:01:17-07:00
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> type ASTERIX is range -5_000..+10_000;
> subtype IDEFIX is ASTERIX range 1..20_000;

If it is what is in your text book, then it is a mistake - at least
from a didactic perspective...
To my surprise, it looks legal Ada.
One (old) compiler compiles without a complaint;
another one (recent) compiles but issues this warning:

obelix.adb:3:38: warning: static value out of range of type "ASTERIX"
defined at line 2
obelix.adb:3:38: warning: "Constraint_Error" will be raised at run
time

And keeps its promise at run-time:

Execution terminated by unhandled exception
Exception name: CONSTRAINT_ERROR
Message: obelix.adb:3 range check failed

G.