Re: [Haskell-cafe] Hopefully simple monad question

newtype VMT m a =  VMT {runVMT :: StateT VMState m a}    deriving (Monad, MonadIO, MonadTrans, TransM, MonadState VMState) works here (ghc-6.10.3) On Wed, Sep 16, 2009 at 11:42 AM, Miguel Mitrofanov wrote:

newtype VMT m a =  VMT {runVMT :: StateT VMState m a}    deriving (Monad, MonadIO, MonadTrans, TransM)

Unfortunately, you can't automatically derive MonadState, since it's a multi-paremeter type class. You'll have to write down the derivation yourself.