[Haskell-cafe] GHC, odd concurrency space leak

[Adam Vogt]

* On Wednesday, April 14 2010, Jesper Louis Andersen wrote:

>> newtype Process a b c = Process (ReaderT a (StateT b IO) c)
>>   deriving (Functor, Monad, MonadIO, MonadState b, MonadReader a)
>
>Note that the automatic derivations of *MonadState b* and *MonadReader a* makes
>GHC spit our some mkUsageInfo warnings in its generation of the .hi-files. They
>don't seem to be dangerous. Glueing instructions for our model kit is given by

The relevant bug for that is: http://hackage.haskell.org/trac/ghc/ticket/3955

--
Adam