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# F-难点索引
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。
| 难点及链接 | 简介 |
|----- | ------ |
| [?](../basic/result-error/result.md#传播界的大明星:) | 用于简化错误传播 |
| [()](../basic/base-type/function.md#无返回值) | 单元类型 |
| `!` : [1](../basic/base-type/function.md#永不返回的函数), [2](../advance/custom-type.md#!从不返回类型) | 永不返回 |
| [@](../basic/match-pattern/all-patterns.md#绑定) | 为一个字段绑定另外一个变量 |
| ['a: 'b](../advance/lifetime/advance.md#生命周期约束) | 生命周期约束 |
