Remove Arbitrary from NoteCommitmentTree
@@ -84,7 +84,6 @@ impl fmt::Debug for Root {
/// Sapling Note Commitment Tree
#[derive(Clone, Debug, Default, Eq, PartialEq)]
-#[cfg_attr(any(test, feature = "proptest-impl"), derive(Arbitrary))]
struct NoteCommitmentTree {
/// The root node of the tree (often used as an anchor).
root: Root,
