13 pub fn merge_join_by<I, J, F>(left: I, right: J, cmp_fn: F)  in merge_join_by()
21         right: put_back(right.into_iter().fuse()),  in merge_join_by()
32     right: PutBack<Fuse<J>>,  field
43     clone_fields!(left, right, cmp_fn);
52     debug_fmt_fields!(MergeJoinBy, left, right);
63         match (self.left.next(), self.right.next()) {  in next()
67             (None, Some(right)) =>  in next()
68                 Some(EitherOrBoth::Right(right)),  in next()
69             (Some(left), Some(right)) => {  in next()
70                 match (self.cmp_fn)(&left, &right) {  in next()
72                         Some(EitherOrBoth::Both(left, right)),  in next()
74                         self.right.put_back(right);  in next()
79                         Some(EitherOrBoth::Right(right))  in next()
88         let (b_lower, b_upper) = self.right.size_hint();  in size_hint()
103             match (self.left.next(), self.right.next()) {  in count()
106                 (None, Some(_right)) => break count + 1 + self.right.into_parts().1.count(),  in count()
107                 (Some(left), Some(right)) => {  in count()
109                     match (self.cmp_fn)(&left, &right) {  in count()
111                         Ordering::Less => self.right.put_back(right),  in count()
122             match (self.left.next(), self.right.next()) {  in last()
129                 (None, Some(right)) => {  in last()
131                         self.right.into_parts().1.last().unwrap_or(right),  in last()
134                 (Some(left), Some(right)) => {  in last()
135                     previous_element = match (self.cmp_fn)(&left, &right) {  in last()
136                         Ordering::Equal => Some(EitherOrBoth::Both(left, right)),  in last()
138                             self.right.put_back(right);  in last()
143                             Some(EitherOrBoth::Right(right))  in last()
157             match (self.left.next(), self.right.next()) {  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()
163                     Ordering::Less => self.right.put_back(right),  in nth()