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@ -23,9 +23,9 @@ fn char_counter<T>(arg: T) -> usize {
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// Squares a number using as_mut().
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// TODO: Add the appropriate trait bound.
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fn num_sq<T>(arg: &mut T) {
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fn num_sq<T : std::ops::Add<Output = T>>(arg: &mut T) {
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// TODO: Implement the function body.
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???
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arg = arg * arg;
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}
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#[cfg(test)]
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