From 9c9607e47ad2b4d39169325d7c8bf9630ff8cd14 Mon Sep 17 00:00:00 2001
From: Jack Grigg <jack@z.cash>
Date: Wed, 1 Aug 2018 03:00:19 +0100
Subject: [PATCH] Add missing wrapping_add() caught by test vectors

---
 src/lib.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 6405b7b8d..a2334368e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -231,7 +231,7 @@ impl DiversifierIndex {
     pub fn increment(&mut self) -> Result<(), ()> {
         let mut k = 0;
         loop {
-            self.0[k] += 1;
+            self.0[k] = self.0[k].wrapping_add(1);
             if self.0[k] != 0 {
                 // No overflow
                 return Ok(());