{"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"[std::cell::OnceCell<T>"}]}
    [std::cell::OnceCell<T> where T]
    [std::rc::Weak<T, A> where T: ?Sized, A: Allocator]
    [std::sync::mpsc::Receiver<T> where T]