[Haskell-cafe] Bug in HLint or haskell-src-exts?

[Martin Huschenbett]

Hello Haskellers,

I've got the following piece of code


type Memory addr value = Map.Map addr value

type Stack item = [item]

data MachineState addr value item = MachineState
   { memory :: Memory addr value
   , stack  :: Stack item
   }
   deriving (Show)

newtype Machine addr value item m a =
     Machine { unMachine :: StateT (MachineState addr value item) m a }
   deriving (Monad, MonadState (MachineState addr value item), 
MonadTrans, MonadIO)


and HLint complains:


Machine.hs:20:31: Parse failure, Parse error


This is exactly the position of the opening bracket after MonadState. 
Why can GHC parse this and HLint cannot?

Regards,

Martin.