pub trait Resolver: Send + Sync + 'static {
// Required method
fn resolve<'life0, 'async_trait>(
&'life0 self,
name: Name,
rrtype: RecordType,
) -> Pin<Box<dyn Future<Output = Result<Answer>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait;
// Provided method
fn resolve_txt<'life0, 'life1, 'async_trait>(
&'life0 self,
name: &'life1 str,
) -> Pin<Box<dyn Future<Output = Result<Answer>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait { ... }
}