150     pub fn overwrite_false(left: &mut bool, right: bool) {  in overwrite_false()
152             *left = right;  in overwrite_false()
157     pub fn overwrite_true(left: &mut bool, right: bool) {  in overwrite_true()
159             *left = right;  in overwrite_true()
170     pub fn saturating_add<T: num_traits::SaturatingAdd>(left: &mut T, right: T) {  in saturating_add()
171         *left = left.saturating_add(&right);  in saturating_add()
175     pub fn overwrite_zero<T: num_traits::Zero>(left: &mut T, right: T) {  in overwrite_zero()
177             *left = right;  in overwrite_zero()
187     pub fn max<T: cmp::Ord>(left: &mut T, right: T) {  in max()
188         if cmp::Ord::cmp(left, &right) == cmp::Ordering::Less {  in max()
189             *left = right;  in max()
194     pub fn min<T: cmp::Ord>(left: &mut T, right: T) {  in min()
195         if cmp::Ord::cmp(left, &right) == cmp::Ordering::Greater {  in min()
196             *left = right;  in min()
207     pub fn overwrite_empty<T>(left: &mut Vec<T>, mut right: Vec<T>) {  in overwrite_empty()
209             left.append(&mut right);  in overwrite_empty()
214     pub fn append<T>(left: &mut Vec<T>, mut right: Vec<T>) {  in append()
215         left.append(&mut right);  in append()
219     pub fn prepend<T>(left: &mut Vec<T>, mut right: Vec<T>) {  in prepend()
220         right.append(left);  in prepend()
221         *left = right;  in prepend()