[Haskell-beginners] Is there an "unscan" function?

[Jeffrey Thornton]

Hello-

Is there standard function in Haskell that effectively does an inverse
scan? For example,

    scanl1 (\ x y -> x+y) [1,2,3,4] == [1,3,6,10].

So is there a very simple built-in way to do this hypothetical example?:

    unscanl1 (\ x y -> y-x) [1,3,6,10] == [1,2,3,4]

Thanks,
Jeffrey
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