@classmethod
    def _new(cls, poly, func, auto=True):
        obj = Expr.__new__(cls)

        obj.poly = poly
        obj.fun = func
        obj.auto = auto

        return obj
Construct new raw ``RootSum`` instance.
dataset/ETHPy150Open sympy/sympy/sympy/polys/rootoftools.py/RootSum._new