Change to unreachable.
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@ -14,7 +14,7 @@ pub fn int_to_roman(number: i32) -> String {
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10 => ("X", "L", "C"),
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100 => ("C", "D", "M"),
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1000 => ("M", "", ""),
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_ => ("", "", ""),
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_ => unreachable!(),
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};
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result += &match digit {
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