[Haskell-cafe] Strange GHC messages?

Liam O'Connor liamoc at cse.unsw.edu.au
Fri Jun 4 09:14:56 EDT 2010

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?


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