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Merge pull request #840 from Rainanxu/main
修复示例代码编号错误 ch13-03-improving-our-io-project.md
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{{#rustdoc_include ../listings/ch13-functional-features/listing-13-18/src/main.rs:here}}
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```
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<span class="caption">示例 13-25:将 `env::args` 的返回值传递给 `Config::build`</span>
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<span class="caption">示例 13-18:将 `env::args` 的返回值传递给 `Config::build`</span>
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`env::args` 函数返回一个迭代器!不同于将迭代器的值收集到一个 vector 中接着传递一个 slice 给 `Config::build`,现在我们直接将 `env::args` 返回的迭代器的所有权传递给 `Config::build`。
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