{"ast_node_type":"function","tokens":[{"end":44,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(d: &mut D) -> Result<T1, T2> {
impl<D: Decoder, T1: Decodable<D>, T2: Decodable<D>> Decodable<D> for Result<T1, T2> {
        match d.read_u8() {