message: impl Wrapping ops for Wrapping<T>
diff: use std::ops::{Add, Sub, Mul};
  +use std::num::Wrapping;
  macro_rules! wrapping_impl {
  ($trait_name:ident, $method:ident, $t:ty) => {
  @@ -76,6 +77,23 @@ wrapping_impl!(WrappingMul, wrapping_mul, i32);
  wrapping_impl!(WrappingMul, wrapping_mul, i64);
  wrapping_impl!(WrappingMul, wrapping_mul, isize);
  +// Well this is a bit funny, but all the more appropriate.
  +impl<T: WrappingAdd> WrappingAdd for Wrapping<T> where Wrapping<T>: Add<Output = Wrapping<T>> {
  + fn wrapping_add(&self, v: &Self) -> Self {
  + Wrapping(self.0.wrapping_add(&v.0))
  + }
  +}
  +impl<T: WrappingSub> WrappingSub for Wrapping<T> where Wrapping<T>: Sub<Output = Wrapping<T>> {
  + fn wrapping_sub(&self, v: &Self) -> Self {
  + Wrapping(self.0.wrapping_sub(&v.0))
  + }
  +}
  +impl<T: WrappingMul> WrappingMul for Wrapping<T> where Wrapping<T>: Mul<Output = Wrapping<T>> {
  + fn wrapping_mul(&self, v: &Self) -> Self {
  + Wrapping(self.0.wrapping_mul(&v.0))
  + }
  +}
  +
  #[test]
  fn test_wrapping_traits() {
  