{"ast_node_type":"variable","tokens":[{"end":27,"kind":"keyword","start":0,"text":"let"}]}
        let code = unsafe {
        let mut qos_class_raw = libc::qos_class_t::QOS_CLASS_UNSPECIFIED;
            libc::pthread_get_qos_class_np(current_thread, &mut qos_class_raw, std::ptr::null_mut())