From 3703121f0905ef438779cc5be6b5718109a0f6f6 Mon Sep 17 00:00:00 2001
From: rigelrozanski <rigel.rozanski@gmail.com>
Date: Tue, 19 Sep 2017 20:16:04 -0400
Subject: [PATCH] Added IsValidNonnegative to coins module

---
 modules/coin/coin.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/modules/coin/coin.go b/modules/coin/coin.go
index 168b06925..b4b8fc977 100644
--- a/modules/coin/coin.go
+++ b/modules/coin/coin.go
@@ -127,6 +127,11 @@ func (coins Coins) IsValid() bool {
 	}
 }
 
+// IsValidNonnegative tests is coins IsValid and IsNonnegative
+func (coins Coins) IsValidNonnegative() bool {
+	return coins.IsValid() && coins.IsNonnegative()
+}
+
 // Plus combines to sets of coins
 //
 // TODO: handle empty coins!