[Haskell-beginners] Common Method for [Maybe a] -> [a]

Hey there, I've got a method: demaybefy :: [Maybe a] -> [a] demaybefy [] = [] demaybefy (x:xs) = case x of Just x -> x : demaybefy xs Nothing -> demaybefy xs However, i feel that there is a method from preload/list/maybe that does exactly the same, but i cannot find it. Can someone help me? best regards Leonhard