{"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
        let path = self.path_unqualified(
            self.generic_arg_list([self.type_arg(t).into(), self.type_arg(e).into()], false);
            self.path_segment_generics(self.name_ref("Result"), generic_arg_list),