{"ast_node_type":"function","tokens":[{"end":55,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(d: &mut CacheDecoder<'a, 'tcx>) -> Self {
impl<'a, 'tcx> Decodable<CacheDecoder<'a, 'tcx>> for Vec<u8> {
        Decodable::decode(&mut d.opaque)