From ac7e922606175f4ea34fbaac87afd81ff82e8eb3 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Thu, 2 Dec 2021 15:40:43 +0300
Subject: [PATCH] native: avoid big.Int allocation in burn()

addTokens and incBalance only read the amount, so it's not a problem.
---
 pkg/core/native/native_nep17.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkg/core/native/native_nep17.go b/pkg/core/native/native_nep17.go
index ca5a5bc7d..0f88df1ad 100644
--- a/pkg/core/native/native_nep17.go
+++ b/pkg/core/native/native_nep17.go
@@ -262,7 +262,9 @@ func (c *nep17TokenNative) burn(ic *interop.Context, h util.Uint160, amount *big
 	if amount.Sign() == 0 {
 		return
 	}
-	c.addTokens(ic, h, new(big.Int).Neg(amount))
+	amount.Neg(amount)
+	c.addTokens(ic, h, amount)
+	amount.Neg(amount)
 	c.postTransfer(ic, &h, nil, amount, stackitem.Null{}, false)
 }