{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
        let return_value = func.new_local(self.location, previous_value.get_type(), "return_value");
            func.new_local(self.location, previous_value.get_type(), "previous_value");
        self.llbb().add_assignment(self.location, previous_var, previous_value);