{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
        let predicates = tcx.mk_poly_existential_predicates(&[ty::Binder::dummy(predicate)]);
        ));
        let self_ty = Ty::new_dynamic(tcx, predicates, tcx.lifetimes.re_erased, ty::Dyn);