freer-simple (hackage): An implementation of an effect system for Haskell (a fork of freer-effects), which is based on the work of Oleg Kiselyov et al.:  Freer Monads, More Extensible Effects  Reflection without Remorse  Extensible Effects  The key features are:  An efficient effect system for Haskell - as a library!  Reimplementations of several common Haskell monad transformers as effects.  Core components for defining your own Effects.
Keywords: bsd3|control|library|program