def concatenate(cls, *args: List['ComponentRef']) -> 'ComponentRef':
        """
        Helper function to append two component references to eachother, e.g.
        a "within" component ref and an "object type" component ref.
        :return: New component reference, with other appended to self.
        """

        a = copy.deepcopy(args[0])
        n = a
        for b in args[1:]:
            while n.child:
                n = n.child[0]
            b = copy.deepcopy(b)  # Not strictly necessary
            n.child = [b]
        return a