124     type Output = Self;  typedef
127     fn add(self, rhs: usize) -> Self::Output {  in add()  argument
140     type Output = Self;  typedef
143     fn add(self, rhs: PhysAddr) -> Self::Output {  in add()  argument
156     type Output = Self;  typedef
159     fn sub(self, rhs: usize) -> Self::Output {  in sub()  argument
172     type Output = usize;  typedef
175     fn sub(self, rhs: PhysAddr) -> Self::Output {  in sub()  argument
242     type Output = Self;  typedef
245     fn add(self, rhs: VirtAddr) -> Self::Output {  in add()  argument
251     type Output = Self;  typedef
254     fn add(self, rhs: usize) -> Self::Output {  in add()  argument
260     type Output = usize;  typedef
263     fn sub(self, rhs: VirtAddr) -> Self::Output {  in sub()  argument
269     type Output = Self;  typedef
272     fn sub(self, rhs: usize) -> Self::Output {  in sub()  argument