ghci will (usually) tell you: phil@arod:~$ ghci GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking

ghci will (usually) tell you: phil@arod:~$ ghci GHCi, version 7.6.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> :t take 5 . filter (\ _ -> True) . drop 3 take 5 . filter (\ _ -> True) . drop 3 :: [a] -> [a] So it’s a function from List of a to List of a