fn fallback_address_book() -> Arc<std::sync::Mutex<AddressBook>> {
        let local_listener = "127.0.0.1:1000"
            .parse()
            .expect("Invalid local listener address");
        let address_book = AddressBook::new(local_listener, Span::none());

        Arc::new(std::sync::Mutex::new(address_book))
    }
/// Create an empty [`AddressBook`] instance using a dummy local listener address.
Create an empty [`AddressBook`] instance using a dummy local listener address.
Create an empty [ ` AddressBook ` ] instance using a dummy local listener address .
fn fallback_address_book() -> Arc<std::sync::Mutex<AddressBook>> {
        let local_listener = "127.0.0.1:1000"
            .parse()
            .expect("Invalid local listener address");
        let address_book = AddressBook::new(local_listener, Span::none());
        Arc::new(std::sync::Mutex::new(address_book))
    }
fn fallback_address_book ( ) -> Arc < std :: sync :: Mutex < AddressBook > > { let local_listener = " " . parse ( ) . expect ( " " ) ; let address_book = AddressBook :: new ( local_listener , Span :: none ( ) ) ; Arc :: new ( std :: sync :: Mutex :: new ( address_book ) ) }
Create an empty [`AddressBook`] instance using a dummy local listener address.
Create an empty [ ` AddressBook ` ] instance using a dummy local listener address .