pub trait ConsistencyLevelOption<'a> {
// Required method
fn consistency_level(&self) -> Option<ConsistencyLevel<'a>>;
// Provided method
fn add_header(&self, builder: Builder) -> Builder { ... }
}
pub trait ConsistencyLevelOption<'a> {
// Required method
fn consistency_level(&self) -> Option<ConsistencyLevel<'a>>;
// Provided method
fn add_header(&self, builder: Builder) -> Builder { ... }
}