Hello everyone. I have a quick question about Time. I was talking about Haskell on the Arch Linux forums today, and someone was trying to put together code that would print a series of periods for, say, 5 minutes. I felt like using 'until' would be the most correct way of going about it, but when I tried to do it... import Time makeLater :: ClockTime -> ClockTime makeLater t = addToClockTime (TimeDiff 0 0 0 0 0 5 0) t updateTime :: ClockTime -> ClockTime updateTime t = t main = do start <- getClockTime until ((==) $ makeLater start) (updateTime) start putStrLn "done" Now, updateTime isn't correct. And this wouldn't print any periods. But GHC is giving me errors: $ runhaskell temp.hs temp.hs:11:2: Couldn't match expected type `IO t' against inferred type `ClockTime' In the expression: until ((==) $ makeLater start) (updateTime) start In a 'do' expression: until ((==) $ makeLater start) (updateTime) start In the expression: do start <- getClockTime until ((==) $ makeLater start) (updateTime) start putStrLn "done" I'm not sure where IO t is coming from at all. Am I even on the right track? How would you write this code?