Re: [Haskell-cafe] Question on nested State monads.

On 13-12-28 09:24 PM, David Banas wrote:

If I want to use a second, nested State monad inside another State monad, must I thread the outer monad’s state through the processing of the inner one, even if the inner one falls out of scope before I return from the processing body of the outer one?

I do not know what the whole sentence "must I ... the outer one" is talking about. But why don't you go scientific and use concrete experiments to find out? Here is a starter: import Control.Monad.State main = print answer answer :: (Bool, Char) answer = evalState (evalStateT program True) 't' program :: StateT Bool (State Char) (Bool, Char) program = do bool <- get char <- lift get return (bool, char)