pub struct TreeSetRevIterator<'self, T> {
priv iter: TreeMapRevIterator<'self, T, ()>,
}Lazy backward iterator over a set
impl<'self, T> std::iter::Iterator for TreeSetRevIterator<'self, T>fn next(&mut self) -> std::option::OptionAdvance the iterator to the next node (in order). If there are no more nodes, return None.
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