How to use the siuba.siu.FuncArg function in siuba

def _dispatch_call(__data, *args, **kwargs):
        # TODO: want to just create call, for now use hack of creating a symbolic
        #       call and getting the source off of it...
        return strip_symbolic(create_sym_call(FuncArg(dispatch_func), __data, *args, **kwargs))

def _dispatch_symbol(__data, *args, **kwargs):
        return create_sym_call(FuncArg(dispatch_func), strip_symbolic(__data), *args, **kwargs)

obj, *rest = node.args
        args = tuple(self.enter_if_call(child) for child in rest)
        kwargs = {k: self.enter_if_call(child) for k, child in node.kwargs.items()}

        attr_chain, target = get_attr_chain(obj, max_n = 2)
        if attr_chain:
            # want _.x.method() -> method(_.x), need to transform
            if attr_chain[0] in self.call_sub_attr:
                # e.g. _.dt.round()
                call_name = ".".join(attr_chain) if self.chain_sub_attr else attr_chain[-1]
                entered_target = self.enter_if_call(target)
            else:
                call_name = attr_chain[-1]
                entered_target = self.enter_if_call(obj.args[0])

        elif isinstance(obj, FuncArg) and self.dispatch_cls is None:
            # want function(_.x) -> new_function(_.x), has form
            call_name = obj.obj_name()
            # the first argument is basically "self"
            entered_target, *args = args
        else:
            # default to generic enter
            return self.generic_enter(node)

        return self.create_local_call(
                call_name, entered_target, node.__class__,
                args, kwargs
                )