[r6rs-discuss] [Formal] blame assignment for contract violations

From: Michael Sperber <sperber>
Date: Tue Oct 31 13:50:38 2006

Robby Findler <robby_at_cs.uchicago.edu> writes:

> At Tue, 31 Oct 2006 19:18:49 +0100, Michael Sperber wrote:
>>
>> Robby Findler <robby_at_cs.uchicago.edu> writes:
>>
>> > The English definition of the word "contract" is all about agreements
>> > between particular parties, etc. The other, perfectly good, English
>> > word is "assertion" and there is certainly a track record for its use
>> > in programming languages. (I prefer real contracts, but I understand if
>> > r6 isn't ready to do that!)
>>
>> I'm sure Anglo-Saxon law allows you to write contracts where one party
>> is unknown, such as when you buy something in a store or enter into a
>> license agreement by unwrapping your copy of Windows.
>
> In the two cases above, when the contracts are actually entered into,
> there are certainly multiple parties. The dictionary definition of a
> contract also matches my sense of the word. Note that the dictionary
> definition is more expansive which may also be confusing -- it means
> both the agreement itself (where there are two or more parties) and the
> document describing the agreement itself.
>
> http://www.answers.com/contract&r=67

So ... I'm lost. Why is what the draft says bad?

>> > Of course, one could say "contract" with the intention that there are
>> > always the same two parties, namely r6 and the program itself. In that
>> > case, the blame always rests with the program, and it is implicit in
>> > the use of the `contract-violation' function that the program is to be
>> > blamed.
>>
>> I'm still confused by your use of "r6"---maybe I'm missing something.
>> `contract-violation' is for contracts between parts of the program,
>> but between the "r6" and the program.
>
> One can kind of think of the implementation of the primitives as one
> party and the rest of the program as the other party (instead of
> treating each library/module as its own party). This is, imo, a
> degenerate use, but one that does match the actual meanings of the
> words.

... lost again. What words? What primitives?

-- 
Cheers =8-} Mike
Friede, V?lkerverst?ndigung und ?berhaupt blabla
Received on Tue Oct 31 2006 - 13:50:26 UTC

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