milessabin/shapeless — pull request #182 by stacycurl (2014-07-17 20:23:00+00:00)
Title: Changed HList split methods to return HLists of HLists (breaking change)

So HList.split == Left :: Right :: HNil, where Left & Right are HLists
Tuple.split == (Left, Right), where Left & Right are tuples
Coproduct.split == Left :+: Right :+: CNil, where Left & Right are Coproducts