51     last: Option<Box<T>>,
123             inner: Box::new(NoDrop::new(PrivateIter {  in iter()
125                 last: self.last.as_ref().map(Box::as_ref).into_iter(),  in iter()
134             inner: Box::new(NoDrop::new(PrivateIterMut {  in iter_mut()
136                 last: self.last.as_mut().map(Box::as_mut).into_iter(),  in iter_mut()
146             last: self.last.as_ref().map(Box::as_ref).into_iter(),  in pairs()
155             last: self.last.as_mut().map(Box::as_mut).into_iter(),  in pairs_mut()
186         self.last = Some(Box::new(value));  in push_value()
223             self.last = Some(Box::new(t));  in pop_punct()
511                 punctuated.last = Some(Box::new(a));  in do_extend()
750     inner: Box<NoDrop<dyn IterTrait<'a, T> + 'a>>,
754     fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T> + 'a>>;  in clone_box()
772         inner: Box::new(NoDrop::new(iter::empty())),  in empty_punctuated_iter()
853     fn clone_box(&self) -> Box<NoDrop<dyn IterTrait<'a, T> + 'a>> {  in clone_box()
854         Box::new(NoDrop::new(self.clone()))  in clone_box()
864     inner: Box<NoDrop<dyn IterMutTrait<'a, T, Item = &'a mut T> + 'a>>,
887         inner: Box::new(NoDrop::new(iter::empty())),  in empty_punctuated_iter_mut()
1118             Some(t) => Some(Box::new(f(fold, *t))),  in fold()