{"ast_node_type":"function","tokens":[{"end":62,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Self {
impl<'a, 'tcx, T> Decodable<DecodeContext<'a, 'tcx>> for LazyValue<T> {
        decoder.read_lazy()