{"ast_node_type":"function","tokens":[{"end":40,"kind":"keyword","start":0,"text":"fn"}]}
    fn decode(decoder: &mut D) -> Self {
impl<'tcx, D: TyDecoder<'tcx>> Decodable<D> for ty::SymbolName<'tcx> {
        ty::SymbolName::new(decoder.interner(), decoder.read_str())