Methods for composing monads. http://alkalisoftware.net
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Methods for composing monads.
The IO monad transformer solves the problem of combining two IO-performing monads, so that both may be transformed separately.
A monad transformer can transform another monad, but if you have two monads both lacking a transformer, one can define an extended distributive law which allows a monad to arise - see Control.Monad.PlusMonad.