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/// Can be used while indexing keys without values, like ``Llrb<K, Empty>``. #[derive(Clone, Eq, PartialEq, PartialOrd, Ord)] pub struct Empty {}
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/// Can be used while indexing keys without values, like ``Llrb<K, Empty>``. #[derive(Clone, Eq, PartialEq, PartialOrd, Ord)] pub struct Empty {}