You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: signaling.rs
    path of file: ./repos/smithay/src/utils
    
    the code of the file until where you have to start completion: //! A general purpose signaling mechanism
//!
//! This mechanism allows inter-module communication, by letting your modules
//! register callbacks to listen for eve
    
    fn basic_signal() {
        let signaler = Signaler::<u32>::new();

        let signaled = Rc::new(Cell::new(false));
        let signaled2 = signaled.clone();

        let _token = signaler.register(move |_| signaled2.set(true));

        signaler.signal(0);

        assert!(signaled.get());
    }