Lazy +Control.Monad.Trans.RWS +transformers

module Control.Monad.Trans.RWS.Lazy
transformers Control.Monad.Trans.RWS.Lazy
A monad transformer that combines ReaderT, WriterT and StateT. This version is lazy; for a strict version, see Control.Monad.Trans.RWS.Strict, which has the same interface.