pub trait FixedIntAsyncWriter {
// Required method
fn write_fixedint_async<'life0, 'async_trait, FI>(
&'life0 mut self,
n: FI
) -> Pin<Box<dyn Future<Output = Result<usize>> + 'async_trait>>
where FI: 'async_trait + FixedInt,
Self: 'async_trait,
'life0: 'async_trait;
}