Remove unneeded clone.
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@ -36,7 +36,7 @@ use kvdb::{Database};
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///
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/// `lookup()` and `contains()` maintain normal behaviour - all `insert()` and `remove()`
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/// queries have an immediate effect in terms of these functions.
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#[derive(Clone)]
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//#[derive(Clone)]
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pub struct OverlayDB {
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overlay: MemoryDB,
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backing: Arc<Database>,
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