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.

Answer 1

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.