scalaz/scalaz — pull request #293 by YoEight (2013-02-28 23:35:11+00:00)
Title: MonadTell and MonadListen typeclasses

MonadWriter typeclass is unusable with a Monoid constraint on W. I think letting the implementer decides if such constraint is needed, is a better idea.

I also provide new namings. MonadWriter becomes MonadTell and ListenableMonadWriter becomes MonadListen