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27 lines
865 B
Rust
27 lines
865 B
Rust
//@ run-pass
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#![allow(dead_code)]
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#![allow(non_camel_case_types)]
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enum pattern { tabby, tortoiseshell, calico }
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enum breed { beagle, rottweiler, pug }
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type name = String;
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enum ear_kind { lop, upright }
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enum animal { cat(pattern), dog(breed), rabbit(name, ear_kind), tiger }
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fn noise(a: animal) -> Option<String> {
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match a {
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animal::cat(..) => { Some("meow".to_string()) }
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animal::dog(..) => { Some("woof".to_string()) }
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animal::rabbit(..) => { None }
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animal::tiger => { Some("roar".to_string()) }
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}
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}
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pub fn main() {
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assert_eq!(noise(animal::cat(pattern::tabby)), Some("meow".to_string()));
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assert_eq!(noise(animal::dog(breed::pug)), Some("woof".to_string()));
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assert_eq!(noise(animal::rabbit("Hilbert".to_string(), ear_kind::upright)), None);
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assert_eq!(noise(animal::tiger), Some("roar".to_string()));
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}
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