{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"self.tcx.lookup_stability(def_id).and_then(|stab|"}]}
                    self.tcx.lookup_stability(def_id).and_then(|stab| match stab.level {
                let is_allowed_through_unstable_modules: Option<Symbol> =
                        StabilityLevel::Stable { allowed_through_unstable_modules, .. } => {