pub trait AsyncExecutable {
// Required method
fn exec<'life0, 'async_trait>(
&'life0 mut self,
) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
// Provided method
fn get_priority(&self) -> usize { ... }
}