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CPS fold.

>>> λ> cfold' (\x t g -> (x : g t)) [] [1..10]
[1,2,3,4,5,6,7,8,9,10]

>>> λ> cfold' (\x t g -> g (x : t)) [] [1..10]
[10,9,8,7,6,5,4,3,2,1]

Wrapper function to cfold'.

>>> λ> cfold (+) 0 [1..3]
6

>>> λ> cfold (:) [] [1..3]
[1,2,3]