[Haskell-cafe] Why is Haskell flagging this?

Daniel Fischer daniel.is.fischer at googlemail.com
Wed Dec 22 13:56:11 CET 2010

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.

More information about the Haskell-Cafe mailing list