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rust-course/contents/appendix/difficulties.md

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附录 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
? 用于简化错误传播
() 单元类型
! : 1, 2 永不返回
@ 为一个字段绑定另外一个变量
'a: 'b 生命周期约束