150     fn add(self, rhs: i32) -> Self::Output {  in add()
151         LineId::new(self.0 + rhs)  in add()
157     fn sub(self, rhs: i32) -> Self::Output {  in sub()
158         LineId::new(self.0 - rhs)  in sub()
179     fn sub(mut self, rhs: LineId) -> Self::Output {  in sub()
180         self.0 -= rhs.0;  in sub()
185     fn add_assign(&mut self, rhs: LineId) {  in add_assign()
186         self.0 += rhs.0;  in add_assign()
202     fn add(self, rhs: LineIndex) -> Self::Output {  in add()
203         LineIndex::new(self.0 + rhs.0)  in add()
210     fn add(self, rhs: i32) -> Self::Output {  in add()
211         LineIndex::new(self.0 + rhs)  in add()
217     fn sub(self, rhs: i32) -> Self::Output {  in sub()
218         LineIndex::new(self.0 - rhs)  in sub()