{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"self.fn_arg_field(untuple_arg,"}]}
                                    self.fn_arg_field(untuple_arg, FieldIdx::from_usize(i))
                                .chain((0..untuple_arg.layout().fields.count()).map(|i| {
                                }))