{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"[std::sync::Arc<T>"}]}
    [std::sync::Arc<T> where T: ?Sized + DynSync + DynSend]
    [std::sync::mpsc::Sender<T> where T: DynSend]
    [std::sync::LazyLock<T, F> where T: DynSend, F: DynSend]