| // run-pass | |
| #[derive(Clone, Debug, PartialEq)] | |
| enum Expression { | |
| Dummy, | |
| Add(Box<Expression>), | |
| } | |
| use Expression::*; | |
| fn simplify(exp: Expression) -> Expression { | |
| match exp { | |
| Add(n) => *n.clone(), | |
| _ => Dummy | |
| } | |
| } | |
| fn main() { | |
| assert_eq!(simplify(Add(Box::new(Dummy))), Dummy); | |
| } |