{"ast_node_type":"function","tokens":[{"end":38,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(d: &mut D) -> Arc<[T]> {
impl<D: Decoder, T: Decodable<D>> Decodable<D> for Arc<[T]> {
        let vec: Vec<T> = Decodable::decode(d);