[Haskell-cafe] Data.Map lookup signature

Hi everyone. The docs in the web on http://www.haskell.org/ghc/docs define Data.Map.lookup as follows: http://www.haskell.org/ghc/docs lookup :: Ord k => k -> Map k a -> Maybe a but my version of ghci does i like that: Data.Map.lookup :: (Ord k, Monad m) => k -> Data.Map.Map k a -> m a but i need the 1. one. my version of ghci is 6.8.2 regards