Direct translation of Haskell monad into Scala

Trying to learn how to program monads in Scala, got some troubles Given the quick code sample import Control.Monad newtype LJ a = LJ { session :: a } instance Monad LJ where return s = LJ s (>>=) m f = f ( session m ) instance Functor LJ where fmap f m = LJ . f $ session m type SimpleLJ = LJ String auth :: String -> String -> SimpleLJ auth = undefined readFeed :: String -> SimpleLJ readFeed = unde