Log message:
devel/hs-operational: import hs-operational-0.2.4.2

This library makes it easy to implement monads with tricky control flow.

This is useful for: writing web applications in a sequential style,
programming games with a uniform interface for human and AI players and easy
replay capababilities, implementing fast parser monads, designing monadic
DSLs, etc.

See the project homepage http://wiki.haskell.org/Operational for a more
detailed introduction and features.