Method has_leaf

atomic-core/tests/crdt_integration_test.rs:212–214

(&self, id: LeafId)

    }

    fn has_leaf(&self, id: LeafId) -> Result<bool, Self::Error> {
        Ok(self.leaves.contains_key(&id))
    }

    fn del_leaf(&mut self, id: LeafId) -> Result<bool, Self::Error> {
        if let Some(leaf) = self.leaves.remove(&id) {