{"ast_node_type":"function","tokens":[{"end":62,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(decoder: &mut DecodeContext<'a, 'tcx>) -> Self {
impl<'a, 'tcx, I: Idx, T> Decodable<DecodeContext<'a, 'tcx>> for LazyTable<I, T> {
        let width = decoder.read_usize();