Well you definitely can do that to my somewhat contrived example that is loosely based off of an example from the `do` expression proposal, but I'm not sure its better.

Part of the beauty of `run` is that you don't have to declare and name a function `calcX`. In longer and more complex examples, declaring a function inline like this is potentially confusing because you don't get to see where it is used, whereas with `run` you assign the return value immediately to a variable.