concrete functor and monad transformers
#1bug-tracker in transformers.cabal not declared
It seems to be unclear to some where to file issues (e.g. http://permalink.gmane.org/gmane.comp.lang.haskell.libraries/24644)
This may be improved by adding the line
bug-reports: http://hub.darcs.net/ross/transformers/issues
to transformers.cabal ...
