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Mar 27th, 2017
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  1. extension IntegerConvertible {
  2. func add<T: IntegerConvertible>(_ number: T) -> CustomNumber {
  3. return CustomNumber(int: int + number.int)
  4. }
  5. }
  6.  
  7. func addNumbers() -> CustomNumber {
  8. return CustomNumber(int: 1).add(CustomNumber(int: 2))
  9. .add(CustomNumber(int: 3))
  10. .add(CustomNumber(int: 4))
  11. .add(CustomNumber(int: 5))
  12. }
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