{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
                let bound_trait_ref = bound_trait_pred.map_bound(|pred| pred.trait_ref);
                assert_eq!(bound_trait_pred.polarity(), ty::PredicatePolarity::Positive);
                for item in self.impl_or_trait_item(bound_trait_ref.def_id()) {