1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 enum pattern { tabby, tortoiseshell, calico }
13 enum breed { beagle, rottweiler, pug }
15 enum ear_kind { lop, upright }
16 enum animal { cat(pattern), dog(breed), rabbit(name, ear_kind), tiger }
18 fn noise(a
: animal
) -> Option
<String
> {
20 animal
::cat(..) => { Some("meow".to_string()) }
21 animal
::dog(..) => { Some("woof".to_string()) }
22 animal
::rabbit(..) => { None }
23 animal
::tiger
=> { Some("roar".to_string()) }
28 assert_eq
!(noise(animal
::cat(pattern
::tabby
)), Some("meow".to_string()));
29 assert_eq
!(noise(animal
::dog(breed
::pug
)), Some("woof".to_string()));
30 assert_eq
!(noise(animal
::rabbit("Hilbert".to_string(), ear_kind
::upright
)), None
);
31 assert_eq
!(noise(animal
::tiger
), Some("roar".to_string()));