ekmett/free — pull request #45 by fizruk (2014-03-06 09:25:18+00:00)
Title: MonadWriter instances for free monad transformers.

This pull request includes `MonadWriter` instances for `IterT`, `FreeT` and `FT` (via `fromFT`/`toFT`).

Perhaps, suggested in #25 laws should be fixed somewhere too.