Changelog of @haskell/mtl 2.2

2.2

  • transformers 0.4 support
  • Added instances for ExceptT
  • Added modify' to Control.Monad.State.*

2.1.3.1

  • Avoid importing Control.Monad.Instances on GHC 7.8 to build without deprecation warnings.

2.1.3

  • Removed the now-irrelevant Error constraint from the MonadError instance for Either e.