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# 附录 F：难点索引
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不可否认，Rust 难点很多，而且知识点也很多，随着时间的进行，或多或少都会对一些难点逐渐模糊，这些难点无法通过目录章节名进行索引，因此集中放在此附录中，进行索引，方便读者朋友查阅。
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| 难点及链接 | 简介 |
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|----- | ------ |
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| [?](https://course.rs/basic/result-error/result.html#传播界的大明星-) | 用于简化错误传播 |
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| [()](https://course.rs/basic/base-type/function.html#无返回值) | 单元类型 |
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| `!` : [1](https://course.rs/basic/base-type/function.html#永不返回的函数), [2](https://course.rs/advance/into-types/custom-type.html#永不返回类型) | 永不返回 |
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| [@](https://course.rs/basic/match-pattern/all-patterns.html#绑定) | 为一个字段绑定另外一个变量 |
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| ['a: 'b](https://course.rs/advance/lifetime/advance.html#生命周期约束-hrtb) | 生命周期约束 |
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