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Update ch04-03-slices.md

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Shinolr 2022-10-07 20:27:02 +08:00
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@ -169,7 +169,7 @@ let s = "Hello, world!";
fn first_word(s: &String) -> &str {
```
而更有经验的 Rustacean 会编写出示例 4-9 中的签名，因为它使得可以对 `String` 值和 `&str` 值使用相同的函数：
而更有经验的 Rustacean 会编写出示例 4-9 中的签名，因为它使得可以对 `&String` 值和 `&str` 值使用相同的函数：
```rust,ignore
{{#rustdoc_include ../listings/ch04-understanding-ownership/listing-04-09/src/main.rs:here}}