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fix: typo in src/advance/smart-pointer/deref.md #1578

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fix: typo in src/advance/smart-pointer/deref.md #1578

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2 changes: 1 addition & 1 deletion src/advance/smart-pointer/deref.md
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Expand Up @@ -206,7 +206,7 @@ fn main() {
}
```

对于 `s1`，我们通过两次 `Deref` 将 `&str` 类型的值赋给了它（**赋值操作需要手动解引用**）；而对于 `s2`，我们在其上直接调用方法 `to_string`，实际上 `MyBox` 并没有实现该方法，能调用 `to_string`，完全是因为编译器对 `MyBox` 应用了 `Deref` 的结果（**方法调用会自动解引用**）。
对于 `s1`，我们通过两次 `Deref` 将 `&str` 类型的值赋给了它（**赋值操作需要手动解引用**）；而对于 `s2`，我们在其上直接调用方法 `to_string`，实际上 `MyBox` 并没有实现该方法，能调用 `to_string`，完全是因为编译器对 `MyBox` 应用了 `Deref`（**方法调用会自动解引用**）。

## Deref 规则总结

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