32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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enum pattern { tabby, tortoiseshell, calico }
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enum breed { beagle, rottweiler, pug }
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type name = ~str;
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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<~str> {
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match a {
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cat(..) => { Some(~"meow") }
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dog(..) => { Some(~"woof") }
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rabbit(..) => { None }
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tiger(..) => { Some(~"roar") }
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}
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}
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pub fn main() {
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assert_eq!(noise(cat(tabby)), Some(~"meow"));
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assert_eq!(noise(dog(pug)), Some(~"woof"));
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assert_eq!(noise(rabbit(~"Hilbert", upright)), None);
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assert_eq!(noise(tiger), Some(~"roar"));
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}
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