Error Handling

[Thomas L. Bevan]

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Hi,

I'm writing a little command line app, but I have a question about error 
handling. The code will go something like,

main = do	(a:b:cs) <- getArgs
		i <- return (read a :: Int)
		j <- return (read b :: Int)
		putStr $ i + j

How can I catch any possible cast exception? Ideally, I think I would like to 
use the ErrorT monad as a means of handling a potentially fairly complex set 
of inputs, but I can see no way of handling these errors neatly within that 
monad.

Tom
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