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lhs test
========
`unsplit` is an arrow that takes a pair of values and combines them
to return a single value:
> unsplit :: (Arrow a) => (b -> c -> d) -> a (b, c) d
> unsplit = arr . uncurry
> -- arr (\op (x,y) -> x `op` y)
`(***)` combines two arrows into a new arrow by running the two
arrows on a pair of values (one arrow on the first item of the pair
and one arrow on the second item of the pair).
f *** g = first f >>> second g
Block quote:
> foo bar
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