pub trait AsyncClient {
    // Required methods
    fn with_config(config: &Config) -> Result<Self, IoError>
       where Self: Sized;
    fn send_to<'life0, 'life1, 'async_trait, A>(
        &'life0 self,
        buf: &'life1 [u8],
        addr: A
    ) -> Pin<Box<dyn Future<Output = Result<usize, IoError>> + Send + 'async_trait>>
       where A: 'async_trait + Into<SocketAddr> + Send,
             Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait;
    fn recv_from<'life0, 'life1, 'async_trait>(
        &'life0 self,
        buf: &'life1 mut [u8]
    ) -> Pin<Box<dyn Future<Output = Result<(usize, SocketAddr), IoError>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait;
}