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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Tue, 12 Mar 2013 18:14:12 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2013-03-12T18:14:12-05:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:mtz6eyrgv524.r2yf3jw9vid3$.dlg@40tude.net...
> On Mon, 11 Mar 2013 13:41:43 -0700 (PDT), Shark8 wrote:
>
> [...]
>> We don't want the subtype "Head" to fail when the Pred'(Pos) is applied
>> [and Pos = 1] while declaring the range; this precisely because the
>> null-range is valid and what we desire. The construction of range 1..0
>> should therefore not generate an exception despite 0 not being a member 
>> of
>> Positive.
>
> The issue of the bounds of an empty string is not related to subtypes. It
> has a long history. But in short, you should not break one thing in order
> to save another.

I totally agree. You should build a time-machine in order to go back and 
tell Jean Ichbiah and his team that. But until you do, it is very relevant 
for Ada - because that is the decision that they made and we're stuck with 
it forever (including all weird consequences).

                                            Randy.