From 9fac9287dd66e3d3c4e745311b2fe4908bcee7e9 Mon Sep 17 00:00:00 2001
From: Guanqun Lu <guanqun.lu@gmail.com>
Date: Mon, 27 Aug 2018 10:12:25 +0800
Subject: [PATCH] extrinsic-pool: use retain()

---
 substrate/extrinsic-pool/src/rotator.rs | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/substrate/extrinsic-pool/src/rotator.rs b/substrate/extrinsic-pool/src/rotator.rs
index 1f4b1c4e737e1..c3cec9152f11a 100644
--- a/substrate/extrinsic-pool/src/rotator.rs
+++ b/substrate/extrinsic-pool/src/rotator.rs
@@ -87,17 +87,7 @@ impl<Hash: hash::Hash + Eq + Clone> PoolRotator<Hash> {
 	pub fn clear_timeouts(&self, now: &Instant) {
 		let mut banned = self.banned_until.write();
 
-		let to_remove = banned
-			.iter()
-			.filter_map(|(k, v)| if v < now {
-				Some(k.clone())
-			} else {
-				None
-			}).collect::<Vec<_>>();
-
-		for k in to_remove {
-			banned.remove(&k);
-		}
+		banned.retain(|_, &mut v| v >= *now);
 	}
 }