assert_eq!(btree.get(k).unwrap(), v);
}
assert_eq!(key_set.len(), btree.len());
key_set.clear();
for (k, v) in indexed_clone.unordered_iter_mut() {
assert_eq!(btree.get(k).unwrap(), v);
}
assert_eq!(key_set.len(), btree.len());
key_set.clear();
for (k, v) in indexed_clone.unordered_iter_mut() {