Allow IO to be wrapped in a newtype in foreign import/export
Up to now, the silent unwrapping of newtypes in foreign import/export has been limited to data values. But it's useful for the IO monad itself: newtype MyIO a = MIO (IO a) foreign import foo :: Int -> MyIO Int This patch allows the IO monad to be wrapped too. This applies to foreign import "dynamic" and "wrapper", thus foreign import "wrapper" foo :: MyIO () -> HisIO (FunPtr (MyIO ())) Warning: I did on the plane, and I'm no longer sure if its 100% complete, so needs more testing. In particular the wrapper/dynamic bit.
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