210     fn add(self, rhs: Self) -> Self::Output {  in add()
211         return Self(self.0 + rhs.0);  in add()
216     fn add_assign(&mut self, rhs: Self) {  in add_assign()
217         self.0 += rhs.0;  in add_assign()
224     fn sub(self, rhs: Self) -> Self::Output {  in sub()
225         return Self(self.0 - rhs.0);  in sub()
230     fn sub_assign(&mut self, rhs: Self) {  in sub_assign()
231         self.0 -= rhs.0;  in sub_assign()
238     fn mul(self, rhs: Self) -> Self::Output {  in mul()
239         return Self(self.0 * rhs.0);  in mul()
246     fn add(self, rhs: usize) -> Self::Output {  in add()
247         return Self(self.0 + rhs);  in add()
252     fn add_assign(&mut self, rhs: usize) {  in add_assign()
253         self.0 += rhs;  in add_assign()
260     fn sub(self, rhs: usize) -> Self::Output {  in sub()
261         return Self(self.0 - rhs);  in sub()
266     fn sub_assign(&mut self, rhs: usize) {  in sub_assign()
267         self.0 -= rhs;  in sub_assign()
274     fn mul(self, rhs: usize) -> Self::Output {  in mul()
275         return Self(self.0 * rhs);  in mul()