darcs patch: Added list operations for arrows

[Peter Collingbourne]

Hello,

This patch adds two arrow combinators which I have found useful: mapA
(equivalent of map) and filterA (equivalent of filter).

Thu Oct 30 16:50:02 GMT 2008  Peter Collingbourne <pcc03 at doc.ic.ac.uk>
  * Added list operations for arrows

Thanks,
-- 
Peter

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