New monads

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It seems that the liftIO function from MonadIO can be generalized to access whatever the base of a transformer stack happens to be. So there is no need for a liftSTM, liftST, etc.

View NewMonads/MonadBase.


This is by Iavor S. Diatchki and can be found at

It is a new version of the mtl package with transformers: ReaderT WriterT StateT ExceptT SearchT ContT

It also defines BaseM which is like MonadBase above.


A simple monad transformer to allow computations in the transformed monad to generate random values.

View NewMonads/MonadRandom.