{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
        let impl_def_id = self.tcx.hir_get_parent_item(ii.hir_id());
        self.check_compatible_stability(ii.owner_id.def_id);
        if self.tcx.impl_trait_ref(impl_def_id).is_none() {