pub trait Map<'a, K, Q, V>: Collection + Get<&'a Q, Output = V>{
// Provided method
fn contains_key(&self, q: &'a Q) -> bool { ... }
}pub trait Map<'a, K, Q, V>: Collection + Get<&'a Q, Output = V>{
// Provided method
fn contains_key(&self, q: &'a Q) -> bool { ... }
}