[Haskell-cafe] Outstanding context : (Num b, Random b)

Hi, I am very new to haskell. Could anyone please explain why these two things are not equivalent: m2 = do a <- (drawInt 1 10) print a drawInt :: Int -> Int -> IO Int drawInt x y = getStdRandom (randomR (x,y)) m1 = do b <- getStdRandom (randomR (1,10)) print b the second one produces *** Binding : m1 *** Outstanding context : (Num b, Random b) in Hugs. thanks horsh