{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"[std::sync::OnceLock<T>"}]}
    [std::sync::OnceLock<T> where T: DynSend + DynSync]
    [std::sync::atomic::AtomicPtr<T> where T]
    [std::sync::Mutex<T> where T: ?Sized + DynSend]