From cc44711204b76ee70b23996b23017c3d790996c4 Mon Sep 17 00:00:00 2001
From: Deirdre Connolly <deirdre@zfnd.org>
Date: Mon, 5 Oct 2020 23:28:32 -0400
Subject: [PATCH] Impl<'a>  Sub<&'a ValueCommitment> for ValueCommitment

---
 zebra-chain/src/sapling/commitment.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/zebra-chain/src/sapling/commitment.rs b/zebra-chain/src/sapling/commitment.rs
index cc099d1a..9c806909 100644
--- a/zebra-chain/src/sapling/commitment.rs
+++ b/zebra-chain/src/sapling/commitment.rs
@@ -187,6 +187,14 @@ impl From<ValueCommitment> for [u8; 32] {
     }
 }
 
+impl<'a> std::ops::Sub<&'a ValueCommitment> for ValueCommitment {
+    type Output = Self;
+
+    fn sub(self, rhs: &'a ValueCommitment) -> Self::Output {
+        self - *rhs
+    }
+}
+
 impl std::ops::Sub<ValueCommitment> for ValueCommitment {
     type Output = Self;