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#[derive(Debug)]
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struct Rectangle {
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width: u32,
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height: u32,
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}
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fn main() {
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let mut list = [
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Rectangle { width: 10, height: 1 },
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Rectangle { width: 3, height: 5 },
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Rectangle { width: 7, height: 12 },
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];
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list.sort_by_key(|r| r.width);
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println!("{list:#?}");
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}
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