Monad Fibre (monadfibre-0.1)

This package defines a Monad Transformer called Fibre, which provides the underlying monad with Choice and Parallelism.

Also included is a Class called @MonadBi@ which acts as a superset of MonadTrans, and provides raise analogous to lift as well as lower, which goes the other way. Natural instances are provided for many Monad Transformers.