[Haskell-cafe] Strange GHC messages?

Hi all, I've got some strange GHC output that doesn't seem to be affecting my program adversely but I thought I should post about it cos it's disquieting mkUsageInfo: internal name? r{tv aIR} mkUsageInfo: internal name? s{tv aIS} It seems to be complaining about this newtype declaration:

newtype ThreadStateM r s v = ThreadState { unbox :: StateT s (ReaderT r IO) v } deriving (Monad, Functor, MonadIO, MonadState s, MonadReader r)

(uses newtype deriving) I'm not sure what the problem here is? Cheers. ~Liam