Use Iterator::all() in place of Iterator::fold()
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@ -145,7 +145,7 @@ impl CommitmentTree {
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self.left.is_some()
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&& self.right.is_some()
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&& self.parents.len() == depth - 1
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&& self.parents.iter().fold(true, |acc, p| acc && p.is_some())
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&& self.parents.iter().all(|p| p.is_some())
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}
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/// Adds a note to the tree. Returns an error if the tree is full.
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