{"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"let"}]}
        let is_const = self.tcx.is_const_fn(def_id.to_def_id())
    fn check_missing_const_stability(&self, def_id: LocalDefId) {
            || (self.tcx.def_kind(def_id.to_def_id()) == DefKind::Trait