From fb19ebde1729e42c7fd90f63149d1732d5bb2610 Mon Sep 17 00:00:00 2001
From: laizy <laizy@users.noreply.github.com>
Date: Fri, 8 Nov 2019 16:56:55 +0800
Subject: [PATCH] add `Sync` constraint for RwLock to prevent memory unsafety
 (#479)

---
 src/sync/rwlock.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sync/rwlock.rs b/src/sync/rwlock.rs
index 65b9dca..e042bbd 100644
--- a/src/sync/rwlock.rs
+++ b/src/sync/rwlock.rs
@@ -57,7 +57,7 @@ pub struct RwLock<T> {
 }
 
 unsafe impl<T: Send> Send for RwLock<T> {}
-unsafe impl<T: Send> Sync for RwLock<T> {}
+unsafe impl<T: Send + Sync> Sync for RwLock<T> {}
 
 impl<T> RwLock<T> {
     /// Creates a new reader-writer lock.