Make SaplingNoteCommitmentTree private for now
@@ -54,7 +54,7 @@ pub struct Position(pub(crate) u64);
/// Sapling Note Commitment Tree
#[derive(Clone, Debug, Default, Eq, PartialEq)]
#[cfg_attr(test, derive(Arbitrary))]
-pub struct SaplingNoteCommitmentTree;
+struct SaplingNoteCommitmentTree;
/// Sapling note commitment tree root node hash.
///
