From faf7abca2af028ae08d55bb51c4634f3d931057b Mon Sep 17 00:00:00 2001
From: Ash <ashermanning@yahoo.co.uk>
Date: Tue, 20 Oct 2020 20:51:49 +0800
Subject: [PATCH] impl core::iter::Sum for Scalar

---
 src/scalar.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/scalar.rs b/src/scalar.rs
index a2459a95..f2359d24 100644
--- a/src/scalar.rs
+++ b/src/scalar.rs
@@ -774,6 +774,18 @@ impl PrimeField for Scalar {
     }
 }
 
+impl<T> core::iter::Sum<T> for Scalar
+where
+    T: core::borrow::Borrow<Scalar>,
+{
+    fn sum<I>(iter: I) -> Self
+    where
+        I: Iterator<Item = T>,
+    {
+        iter.fold(Self::zero(), |acc, item| acc + item.borrow())
+    }
+}
+
 #[test]
 fn test_inv() {
     // Compute -(q^{-1} mod 2^64) mod 2^64 by exponentiating