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    <title>Option on 极客老墨</title>
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      <title>Rust 学习笔记 09：枚举与模式匹配</title>
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      <description>Rust 的 Enum 根本不是你想象中的那种只能枚举 0,1,2 的常量组。它是代数数据类型，配合 match 模式匹配，它是处理复杂状态和空值 (Null) 的终极武器。</description>
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