:: (a -> a -> Bool) -> [a] -> [[a]] package:yi-language

Alternative to groupBy.

groupBy' (\a b -> abs (a - b) <= 1) [1,2,3] = [[1,2,3]]

whereas

groupBy (\a b -> abs (a - b) <= 1) [1,2,3] = [[1,2],[3]]

TODO: Check in ghc 6.12 release if groupBy == groupBy'.