{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
        let hir_id = tcx.local_def_id_to_hir_id(def);
    fn is_const_param_default(tcx: TyCtxt<'_>, def: LocalDefId) -> bool {
        let (_, parent_node) = tcx