From 5c25070556787785a75c6fdbb1fe061060581213 Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Sat, 9 Nov 2019 11:50:30 +0200
Subject: [PATCH] lib/uint64set: remove superflouos check for item existence
 before deleting it in Set.Subtract

---
 lib/uint64set/uint64set.go | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/lib/uint64set/uint64set.go b/lib/uint64set/uint64set.go
index ee119333e..0bbea5f45 100644
--- a/lib/uint64set/uint64set.go
+++ b/lib/uint64set/uint64set.go
@@ -230,9 +230,7 @@ func (s *Set) Subtract(a *Set) {
 	aCopy := a.Clone()
 	// TODO: optimize it
 	for _, x := range aCopy.AppendTo(nil) {
-		if s.Has(x) {
-			s.Del(x)
-		}
+		s.Del(x)
 	}
 }