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struct Container<K: Eq, V> {
    values: Vec<(K, V)>,
}

impl<K: Eq, V> Container<K, V> {
    fn new() -> Self {
        Self { values: vec![] }
    }

    fn insert(&mut self, k: K, v: V) { /* FIXME */
    }

    fn get(&self, k: &K) -> Option<&V> {
        None
    }
}

fn main() {
    let alice = "alice".to_string();
    let bob = "bob".to_string();
    let robert = "Robert".to_string();
    let mut cont = Container::new();
    cont.insert(bob.clone(), bob.clone());
    cont.insert(bob.clone(), robert);
    println!("{} -> {:?}", &alice, cont.get(&alice));
    println!("{} -> {:?}", &bob, cont.get(&bob));
    // Output should be Robert
}