darcs patch: Added list operations for arrows

[Sean Leather]

> I also agree with you. See, for example, EMGM's use of generic versions of
>> Prelude functions.
>>
>
> What is EMGM?
>

My apologies for not providing the appropriate link.

  http://www.cs.uu.nl/wiki/GenericProgramming/EMGM

In summary: datatype-generic programming using type classes with a
sum-of-products view.

Sean
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