[Haskell-cafe] Occurs check error, help!

boblettoj boblettoj99 at msn.com
Sat Mar 20 15:39:00 EDT 2010

Ah yes, that makes sense now, however i have another problem, here is the
updated code:

--function used to shuffle cards 
--list equals random member of array plus the rest of the array
--i is randomly generated from range of length equal to that of cards.
shuffle :: Int -> [a] -> [a]
shuffle i [] = []
shuffle i cards = [(cards!!i) :
	(shuffle (randomR(0, ((length cards)-2)))
	(delete (cards!!i) cards))]

and the message:
    Couldn't match expected type `Int'
           against inferred type `g -> (Int, g)'
    In the first argument of `shuffle', namely
        `(randomR (0, ((length cards) - 2)))'
    In the second argument of `(:)', namely
            (randomR (0, ((length cards) - 2))) (delete (cards !! i)
    In the expression:
          (cards !! i)
        : (shuffle
             (randomR (0, ((length cards) - 2))) (delete (cards !! i)

Doesn't RandomR return an Int?
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