import Text.ParserCombinators.Parsec

data PermParser tok st a = Perm (Maybe a) [Branch tok st a]
data Branch tok st a     = forall b. Branch (PermParser tok st (b -> a))
(GenParser tok st b)

I have hoogled the `forall` but i cannot find any appropriate answer!  

thanks!

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fac n = foldr (*) 1 [1..n]
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