[Haskell-beginners] Type inference question

[Zachary Turner]

Given the following two function definitions:

let func4 l = map (\y -> y+2) (filter (\z -> z `elem` [1..10]) (5:l))
let func4_pf = map (+2) . filter (`elem` [1..10]) . (5 :)

which are equivalent, why does the first one have a type of

func4 :: (Num a, Enum a) => [a] -> [a]

while the second one has a type of

func4_pf :: [Integer] -> [Integer]

Shouldn't the types be the same?
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