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fix: fix typo in persistent-stack/drop-arc.md #1553

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fix: fix typo in persistent-stack/drop-arc.md #1553

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2 changes: 1 addition & 1 deletion src/too-many-lists/persistent-stack/drop-arc.md
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Expand Up @@ -31,7 +31,7 @@ impl<T> Drop for List<T> {
}
```

这里有一个没见过的方法 `Rc::Try_unwrap` ，该方法会判断当前的 `Rc` 是否只有一个强引用，若是，则返回 `Rc` 持有的值，否则返回一个错误。
这里有一个没见过的方法 `Rc::try_unwrap` ，该方法会判断当前的 `Rc` 是否只有一个强引用，若是，则返回 `Rc` 持有的值，否则返回一个错误。

可以看出，我们会一直 drop 到第一个被其它链表所引用的节点：
```shell
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