pub trait Completer {
// Required method
fn completions(&mut self, start: &str) -> Vec<String>;
// Provided method
fn on_event(&mut self, _event: Event<'_, '_>) { ... }
}
pub trait Completer {
// Required method
fn completions(&mut self, start: &str) -> Vec<String>;
// Provided method
fn on_event(&mut self, _event: Event<'_, '_>) { ... }
}