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fn main() {
    let player_scores = [
        ("Jack", 20), ("Jane", 23), ("Jill", 18), ("John", 19),
    ];

    let players = player_scores
        .iter()
        .map(|&(player, _score)| {
            player
        })
        .collect::<Vec<_>>();

    assert_eq!(players, ["Jack", "Jane", "Jill", "John"]);
}