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- extension IntegerConvertible {
- func add<T: IntegerConvertible>(_ number: T) -> CustomNumber {
- return CustomNumber(int: int + number.int)
- }
- }
- func addNumbers() -> CustomNumber {
- return CustomNumber(int: 1).add(CustomNumber(int: 2))
- .add(CustomNumber(int: 3))
- .add(CustomNumber(int: 4))
- .add(CustomNumber(int: 5))
- }
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