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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: A function that cannot be called?
Date: Sun, 21 Oct 2018 11:51:06 +0200
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Xref: reader02.eternal-september.org comp.lang.ada:54678
Date: 2018-10-21T11:51:06+02:00
List-Id: <comp.lang.ada>

On 2018-10-21 11:07, G.B. wrote:

> The idea is that classical logic caused, and continues to cause,
> (features of) programming languages like Ada, in some sense.

A bizarre idea. Logic does not cause anything, in the context of 
programming languages it is a tool.

> The idea is not to suggest that programmers need to be concerned
> with formal models in order to write programs.
> 
> So, I guess for writing an embedded program like
> 
>    loop
>      Ouput (Compute (Input));
>    end loop;
> 
> one doesn't need to be aware that classical logic, without some
> type system, incurs the possibility of the HALTing trouble.
> But, OTOH, pure functionists with "program terminating types"
> will need monads and things as a way to write a non-terminating
> program.

This confusion of program properties with program purpose probably 
irritates people like Randy most. Whatever property of a program is, 
that becomes interesting only and exclusively with connection to the 
purpose of the program.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de