Import monad state

Question

I'm trying to import the monad State. I did the following command: ``` :m Control.Monad.State ``` But the module cannot be found. I'm using `GHCi, version 7.0.4:`. Can you give me some hint to fix the problem? Thank you.

Accepted Answer

You're missing the `mtl` package.

You can either install it from Hackage yourself; or install the Haskell Platform, which comes with the necessary libraries.

Import monad state

Solution

Problem