[Haskell-cafe] ~ operator ?

[briand at aracnet.com]

Hi all,

I was creating "bigger" uncurries which I am simply extending from an existing uncurry I found some where, e.g.

uncurry4 :: (a -> b -> c -> d -> e) -> ((a, b, c, d) -> e)
uncurry4 f ~(a,b,c,d) = f a b c d

when I realized, what's the "~" for ?

I've only been able to find a partial explanation that it involves preserving laziness, or something, maybe ?

I was hoping someone could enlighten me.

Thanks

Brian