18 lines
357 B
Plaintext
18 lines
357 B
Plaintext
enum Option { Some(i64), None }
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fn main() -> i64 {
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let s = Option::Some(42);
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let n = Option::None;
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// 打印 tag 值 (Some=0, None=1)
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print_i64(s);
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print_i64(n);
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// match 判断是 Some 还是 None（只比较 tag）
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match s {
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Option::None => { print_i64(999); }
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_ => { print_i64(100); }
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}
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return 0;
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}
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