Fix code sample output in unchecked-uninit.md #491
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`dbg!()` prints to stderr, which I assume is the reason there is no visible output when running the example in the book. By using `println!()` instead, the output becomes visible.
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dbg!()prints to stderr, which I assume is the reason there is no visible output when running the example in the book. By usingprintln!()instead, the output becomes visible.