{"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
                let bound = poly_trait_ref.map_bound(|trait_ref| {
            | PredicateFilter::SelfAndAssociatedTypeBounds => {
                    ty::ClauseKind::Trait(ty::TraitPredicate { trait_ref, polarity })