pub trait AsyncIndex<IndexType> {
type Output: Send + Sync;
// Required method
fn get<'life0, 'async_trait>(
&'life0 self,
index: IndexType,
) -> Pin<Box<dyn Future<Output = Self::Output> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
}