struct WeaponData {
    damage: usize,
}

struct ArmorData {
    protection: usize,
}

struct ConsumeableData {
    healing: usize,
}

impl WeaponData {
    fn do_damage(&self) {}
}

impl ArmorData {
    fn mitigate_damage(&self) {}
}

enum Item {
    Weapon(WeaponData),
    Armor(ArmorData),
    Consumeable(ConsumeableData),
}

use Item::*;

pub fn main() -> () {
    let sword = Weapon(WeaponData { damage: 6 });
    let armor = Armor(ArmorData { protection: 6 });
    let poition = Consumeable(ConsumeableData{ healing: 6 });

    let equipment = vec![sword, armor, poition];

    for e in equipment {
        match e {
            Weapon(weapon) => { weapon.do_damage(); }
            Armor(armor) => { armor.mitigate_damage(); }
            _           => { }
        }
    }
}