I have been work my way through "Haskell The Craft of Functional Programming", all was fine until IO (chapter 18). That is causing me bafflement. I am trying to write a totally trivial program that reads a series of integers from the console until it gets a zero, then returns the series of integers as a list. I am down to randomly editing my code, never a good sign. Any clues would be appreciated, My code so far, which clear doesn't work, is: getInt :: IO Int getInt = do putStr "Enter number (zero to quit)" line <- getLine return (read line :: Int) anIntList :: [Int] anIntList = do let n = getInt if n == 0 then return [] else return (n : anIntList) ps: even a simple version that returns an Int i can't get to work. anInt :: Int anInt = do n <- getInt return n