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Update macros.md (#180)
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src/macros.md

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@@ -17,7 +17,7 @@ macro_rules! say_hello {
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}
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fn main() {
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// 这个调用将会展开成 `println("Hello");`!
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// 这个调用将会展开成 `println!("Hello!");`
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say_hello!()
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}
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```

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