[Haskell-cafe] Re: Laziness question

[Stefan Holdermans]

Nicolas,

> OK, I better understand now where we disagree. You want to see in the type
> whether or not the free theorem apply, I want them to always apply when
> no call to unsafe function is made.

Implementing your suggestion would make me feel uncomfortable. Turning seq into an unsafe operations effectively places it outside the language, like unsafePerformIO isn't really part of the language (in my view, at least). But experience has made it clear that there are plenty of occasions in which we cannot really do without seq (even though its presence in the language is prominent subject of debate).

Cheers,

  Stefan