[Haskell-cafe] what does the '~' mean ?

[zaxis]

instance (BinaryDefer a, BinaryDefer b) => BinaryDefer (a,b) where
    put (a,b) = put2 a b
    get = get2 (,)
    size x = let ~(a,b) = x in size a + size b
    putFixed (a,b) = putFixed2 a b
    getFixed = getFixed2 (,)

in `size` function, what does the `~` mean ?    

Sincerely!



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fac n = let {  f = foldr (*) 1 [1..n] } in f 
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