add invariant about number of returned links
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@ -142,6 +142,8 @@ impl Tree {
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/// Append one leaf to the tree.
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/// Append one leaf to the tree.
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///
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///
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/// Returns links to actual nodes that has to be persisted as the result of the append.
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/// Returns links to actual nodes that has to be persisted as the result of the append.
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/// If completed without error, at least one link to the appended
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/// node (with metadata provided in `new_leaf`) will be returned.
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pub fn append_leaf(&mut self, new_leaf: NodeData) -> Result<Vec<EntryLink>, Error> {
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pub fn append_leaf(&mut self, new_leaf: NodeData) -> Result<Vec<EntryLink>, Error> {
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let root = self.root;
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let root = self.root;
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let new_leaf_link = self.push(new_leaf.into());
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let new_leaf_link = self.push(new_leaf.into());
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