newtype Fun a = Fun (Fun a -> a) fun x@(Fun f) = f x myFix = fun (Fun fun)
newtype Fun a = Fun (Fun a -> a) unwrap (Fun f) = f selfApply f = unwrap f f myfix f = selfApply $ Fun $ \g -> f (selfApply g) > myfix (\f n -> if n==0 then 1 else n * f (n-1)) 5 120
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Какие вы оба умные :-)
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