gistfile1.txt

    Couldn't match expected type `ClockTime'
                with actual type `time-1.4:Data.Time.Clock.UTC.UTCTime'
    In the first argument of `isObsolete', namely `timeStamp'
    In a stmt of a 'do' block: isObsolete timeStamp depends
    In the expression:
      do { timeStamp <- getModificationTime file;
           isObsolete timeStamp depends }