{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"GenericArgsMode::ReturnTypeNotation"}]}
                    GenericArgsMode::ReturnTypeNotation => {
                GenericArgs::Parenthesized(data) => match generic_args_mode {
                        let err = match (&data.inputs[..], &data.output) {