65             (Some(left), None) =>  in next()
66                 Some(EitherOrBoth::Left(left)),  in next()
67             (None, Some(right)) =>  in next()
68                 Some(EitherOrBoth::Right(right)),  in next()
69             (Some(left), Some(right)) => {  in next()
72                         Some(EitherOrBoth::Both(left, right)),  in next()
75                         Some(EitherOrBoth::Left(left))  in next()
79                         Some(EitherOrBoth::Right(right))  in next()
93             (Some(x), Some(y)) => x.checked_add(y),  in size_hint()
105                 (Some(_left), None) => break count + 1 + self.left.into_parts().1.count(),  in count()
106                 (None, Some(_right)) => break count + 1 + self.right.into_parts().1.count(),  in count()
107                 (Some(left), Some(right)) => {  in count()
124                 (Some(left), None) => {  in last()
125                     break Some(EitherOrBoth::Left(  in last()
129                 (None, Some(right)) => {  in last()
130                     break Some(EitherOrBoth::Right(  in last()
134                 (Some(left), Some(right)) => {  in last()
136                         Ordering::Equal => Some(EitherOrBoth::Both(left, right)),  in last()
139                             Some(EitherOrBoth::Left(left))  in last()
143                             Some(EitherOrBoth::Right(right))  in last()
159                 (Some(_left), None) => break self.left.nth(n).map(EitherOrBoth::Left),  in nth()
160                 (None, Some(_right)) => break self.right.nth(n).map(EitherOrBoth::Right),  in nth()
161                 (Some(left), Some(right)) => match (self.cmp_fn)(&left, &right) {  in nth()