{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"[std::sync::Mutex<T>"}]}
    [std::sync::Mutex<T> where T: ?Sized+ DynSend]
    [std::sync::atomic::AtomicPtr<T> where T]
    [std::sync::mpsc::Sender<T> where T: DynSend]