[Haskell-cafe] Question on a common pattern

In my code, I'm doing this quite a lot: x <- someIO case x of Opt1 -> ... Having a line for extracting the value from the IO (or STM) and then acting on the value seems unnatural. Is there a more concise way to do this? This code: case someIO of Opt1 -> ... Doesn't work, but is there something like that, that is valid?