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Rust Brain Teasers: Doubling the right value (page 69?)
The page number is absent for the “card” pages unfortunately, but it’s before page 70.
println!("2 * 4 = {}", double_it(2));
should be
println!("2 * 4 = {}", double_it(4));
It won’t change the outcome, but I’d put a “4” at least just for the sake of clarity. 
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