{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"decoder.interner().mk_poly_existential_predicates_from_iter("}]}
        decoder.interner().mk_poly_existential_predicates_from_iter(
        let len = decoder.read_usize();
            (0..len).map::<ty::Binder<'tcx, _>, _>(|_| Decodable::decode(decoder)),