{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"impl<'tcx,"}]}
impl<'tcx, D: TyDecoder<'tcx>> RefDecodable<'tcx, D> for ty::List<(VariantIdx, FieldIdx)> {
    fn decode(decoder: &mut D) -> &'tcx Self {