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Oleg Kiselyov's three new monad transformers for multi-prompt delimited control
(released with his permission)
This library implements the superset of the interface described in
* A Monadic Framework for Delimited Continuations,
R. Kent Dybvig, Simon Peyton Jones, and Amr Sabry
JFP, v17, N6, pp. 687--730, 2007.
http://www.cs.indiana.edu/cgi-bin/techreports/TRNNN.cgi?trnum=TR615
This library's Control.Monad.CC.CCCxe is derived as a CPS version of
http://hackage.haskell.org/package/CC-delcont-exc's Control.Monad.CC.CCExc.
Control.Monad.CC.CCCxe is sometimes more efficient; it is always less perspicuous.
Both libraries provide the identical interface and are interchangeable. It seems
that CC-delcont-exc's Control.Monad.CC.CCExc is faster at delimited control but
imposes more overhead on the conventional code; Control.Monad.CC.CCCxe is dual.
It pays to use Control.Monad.CC.CCCxe in code with long stretches of determinism
punctuated by fits and restarts.
