Re: [Haskell-cafe] State monad is missing Applicative instance

On Sat, 14 Mar 2009, Peter Verswyvelen wrote:

I was using the transformers but still had to implement the Applicative instance of State This package contains an applicative instance for StateT but not for State

In 'transformers' State is a type synonym for StateT Identity and thus does not need an own instance declaration.