[Haskell-cafe] Simplest way to move a ... `using` ... line into the IO monad?

Hi all, What is the simplest way to translate a non-monadic line of Haskell code, such as: res = map foo xs `using` parList rseq For use in the IO monad? This doesn’t work: res <- mapM fooM xs `using` parTraversable rseq complaining: No Traversable instance for IO. Thanks, -db