Re: [Haskell-cafe] Why is Haskell flagging this?

On Wednesday 22 December 2010 12:03:01, Ryan Ingram wrote:

Huh, that's weird, I just copy and pasted this into a new file and it worked for me.

As a guess, you have mtl-1.*? In mtl-2.*, State s is made a type synonym for StateT s Identity, so there's no longer a data constructor State.