From 8b85f648ca6e02f77fd9370e54904e860f4b006f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Drwi=C4=99ga?= <tomasz@parity.io>
Date: Mon, 13 Nov 2017 17:09:30 +0100
Subject: [PATCH] HashMap::retain

---
 rpc/src/v1/helpers/nonce.rs | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/rpc/src/v1/helpers/nonce.rs b/rpc/src/v1/helpers/nonce.rs
index 2b4df49ae..30ad15211 100644
--- a/rpc/src/v1/helpers/nonce.rs
+++ b/rpc/src/v1/helpers/nonce.rs
@@ -57,10 +57,7 @@ impl Reservations {
 	/// The reserved nonce cannot be smaller than the minimal nonce.
 	pub fn reserve(&mut self, sender: Address, minimal: U256) -> Reserved {
 		if self.nonces.len() + 1 > Self::CLEAN_AT {
-			let to_remove = self.nonces.iter().filter(|&(_, v)| v.is_empty()).map(|(k, _)| *k).collect::<Vec<_>>();
-			for address in to_remove {
-				self.nonces.remove(&address);
-			}
+			self.nonces.retain(|_, v| !v.is_empty());
 		}
 
 		let pool = &self.pool;