Okay but why?

Sincerely: what is the pragmatic value?

[edit: NM, end of the page...

> Semantics and correctness of implementation It is not obvious how the Mariposa language could be given a formal semantics. Since there is no specification of its semantics, it doesn't even make sense to ask if the implementation is right or wrong. However, we are sure that the implementation is incorrect for almost any conceivable semantics. It should be understood only as an exploratory game.

]