import qualified IO
[h | h <- IO.openFile "testtext" IO.ReadMode]

Output:

Prelude Data.Set> :load abc
[1 of 1] Compiling Main             ( abc.hs, interpreted )

abc.hs:2:0:
    Couldn't match expected type `Language.Haskell.TH.Syntax.Q
                                    [Language.Haskell.TH.Syntax.Dec]'
           against inferred type `[a]'
    In the expression: [h | h <- IO.openFile "testtext" IO.ReadMode]
Failed, modules loaded: none.
Prelude Data.Set>