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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