The same way as a pure and lazy programming language. That is to say, the IO monad. This abstraction works for both lazy and eager evaluation because it's inter

The same way as a pure and lazy programming language. That is to say, the IO monad. This abstraction works for both lazy and eager evaluation because it's internally just passing a token from function to function. When you have something like `doThis >> doThat` (two actions sequentially) the first action results in a token (RealWorld#) that must be passed into the second action. Even though the evaluation of the two actions may be undetermined in a lazy language (but determined in a strict language), the token being passed around has a definite order.