pub trait MassClient {
// Required method
fn send<'life0, 'async_trait>(
&'life0 self,
requests: Vec<RpcMessage>,
max_in_flight: usize,
) -> Pin<Box<dyn Future<Output = Result<Vec<RpcMessage>, MassClientError>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}