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Update chapter_3_16_4.md
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@@ -45,6 +45,7 @@ fn main() {
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}
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```
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代码运行结果如下:
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第一个“Dog leave”打印是第14行调用释放_a产生,最后一个“Dog leave”打印则是_b离开作用域时调用drop方法产生。
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