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// run-pass #![allow(dead_code)] enum Animal { Cat = 0, Dog = 1, Horse = 2, Snake = 3, } enum Hero { Batman = -1, Superman = -2, Ironman = -3, Spiderman = -4 } pub fn main() { let pet: Animal = Animal::Snake; let hero: Hero = Hero::Superman; assert_eq!(pet as usize, 3); assert_eq!(hero as isize, -2); }