21 lines
609 B
Rust
21 lines
609 B
Rust
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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fn main() {
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assert noise(cat(tabby)) == Some(~"meow");
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assert noise(dog(pug)) == Some(~"woof");
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assert noise(rabbit(~"Hilbert", upright)) == None;
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assert noise(tiger) == Some(~"roar");
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} |