@sig(H/ ("a"/ H >> "a" >> "a") >> ["a"] >> ["a"])
def scanl1(f, xs):
    """
    scanl1 :: (a -> a -> a) -> [a] -> [a]

    scanl1 is a variant of scanl that has no starting value argument
    """
    raise NotImplementedError()
dataset/ETHPy150Open billpmurphy/hask/hask/Data/List.py/scanl1/swapped operands of `/`