{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"rustc_ast::BoundPolarity::Maybe(_)"}]}
            rustc_ast::BoundPolarity::Maybe(_) => {
            rustc_ast::BoundPolarity::Negative(_) => (ty::PredicatePolarity::Negative, bounds),
                (ty::PredicatePolarity::Positive, &mut Vec::new())