{"ast_node_type":"variable","tokens":[{"end":82,"kind":"keyword","start":0,"text":"let"}]}
            let typing_env = ty::TypingEnv::non_body_analysis(tcx, parent_def_id);
        outlives_env: LazyCell::new(|| {
            let (infcx, param_env) = tcx.infer_ctxt().build_with_typing_env(typing_env);