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From: "G.B." <bauhaus@notmyhomepage.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Tests in a software release
Date: Tue, 31 Oct 2017 08:17:21 +0100
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Date: 2017-10-31T08:17:21+01:00
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On 30.10.17 21:56, Dmitry A. Kazakov wrote:
> On 2017-10-30 21:44, G. B. wrote:
>> Dmitry A. Kazakov <mailbox@dmitry-kazakov.de> wrote:
>>> On 2017-10-28 08:53, G.B. wrote:
>>>> On 27.10.17 20:54, Dmitry A. Kazakov wrote:
>>>>> The contract requires Constraint_Error propagation.
>>>>
>>>> Checks require Constraint_Error propagation.
>>>
>>> Checks ensure Constraint_Error as a part of implementation.
>>
>> Implementation of checks, not of contracts.
> 
> This is exactly same.

So, Ada programs will check theirs checks?

Expectations can be stated in comments,
or be part of accompanying documentation and still
be part of a contract.

> There is nothing that is not behavior.

Checking is behavior. However, let SPARK check conditions
of a contract, and let the result be Truth. Then they
have been checked before the program even runs, and
turning *off* Ada checks is, therefore, justified.

Disabling Ada checks means to rely on this contract.

> There is nothing that may not fall under the contract.

There are very many things, even in a program,
that do exist, exhibit behavior, but are not
part of any known, non-fictional contract, such as
the transitive closure of an unspeakable hypothesis.