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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Ada 2012 Constraints (WRT an Ada IR)
Date: Sat, 3 Dec 2016 17:26:58 +0100
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Xref: news.eternal-september.org comp.lang.ada:32586
Date: 2016-12-03T17:26:58+01:00
List-Id: <comp.lang.ada>

On 2016-12-03 15:02, G.B. wrote:
> On 03.12.16 11:23, Dmitry A. Kazakov wrote:
>> On 2016-12-02 20:50, G.B. wrote:
>>> On 02.12.16 17:21, Dmitry A. Kazakov wrote:
>>>> Predicates are just arbitrary expressions the programmer sets without
>>>> understanding all effects of his actions.
>>>
>>> So are programs.
>>
>> When written in C?
>
> No, Ada.

Ada programs are not written without understanding what they do, not 
usually.

> The question that you didn't answer was about how all normal
> Ada source texts can be known to express a fully proven program,
> by omitting assertions and replacing them with something else.

I was answering to your claim about how [Ada] programs are written.

>  There will be
> no run-time assertions caused by this Assert. Guess why?

No idea, it is irrelevant. The discussion was about predicates.

> Predicates, a.k.a. all Boolean expressions, are our only way
> of making statements that can be true or not. Or so I have learned.

But in this discussion predicates have the meaning defined in Ada RM. My 
point was about their usefulness for Ada programming.

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