libghc-free-dev - 5.1.9-1+b4 main

Free monads are useful for many tree-like structures and domain specific
languages.
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A Monad n is a free Monad for f if every Monad homomorphism from n to another
monad m is equivalent to a natural transformation from f to m.
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Cofree comonads provide convenient ways to talk about branching streams and
rose-trees, and can be used to annotate syntax trees.
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A Comonad v is a cofree Comonad for f if every Comonad homomorphism another
comonad w to v is equivalent to a natural transformation from w to f.
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This package provides a library for the Haskell programming language.
See http://www.haskell.org/ for more information on Haskell.