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- #[derive(Debug)]
- enum E {
- A,
- B,
- C,
- D
- }
- fn main() {
- let s = E::D;
- match s {
- E::A => println!("A"),
- E::B => println!("C"),
- unexpected => println!("unexpected! {:?}", unexpected) // ここを _ にすると println!の引数として使えなくなる
- }
- }
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