[Haskell-cafe] state monad transformer that adds or combines state

[Francesco Ariis]

On Mon, May 14, 2018 at 10:27:19PM -0700, Dennis Raddle wrote:
> In local computations, I may want to use some additional state. Is there a
> way to add a little extra state temporarily?

Would StateT work (in general, taking advantage of what transformers
have to offer)?