{"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
        let def_id = item.owner_id.to_def_id();
    fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
        // NOTE(nbdd0121): use `dyn_compatibility_violations` instead of `is_dyn_compatible` because