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Merge pull request #417 from Nangos/patch-6

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Update ch04-02-references-and-borrowing.md
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src/ch04-02-references-and-borrowing.md
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@ -112,7 +112,7 @@ fn change(some_string: &mut String) {
首先，必须将 `s` 改为 `mut`。然后必须创建一个可变引用 `&mut s` 和接受一个可变引用 `some_string: &mut String`。 首先，必须将 `s` 改为 `mut`。然后必须创建一个可变引用 `&mut s` 和接受一个可变引用 `some_string: &mut String`。
不过可变引用有一个很大的限制：在特定作用域中的特定数据有且只有一个可变引用。这些代码会失败： 不过可变引用有一个很大的限制：在特定作用域中的特定数据只能有一个可变引用。这些代码会失败：
<span class="filename">文件名: src/main.rs</span> <span class="filename">文件名: src/main.rs</span>