From 1ef836abb9cfc41dffe07189b221b57472707e05 Mon Sep 17 00:00:00 2001
From: teor <teor@riseup.net>
Date: Wed, 17 Feb 2021 11:57:51 +1000
Subject: [PATCH] Add a missing Sync bound

---
 tower-batch/src/semaphore.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tower-batch/src/semaphore.rs b/tower-batch/src/semaphore.rs
index c9f0adad..220fcc72 100644
--- a/tower-batch/src/semaphore.rs
+++ b/tower-batch/src/semaphore.rs
@@ -32,7 +32,7 @@ pub(crate) struct Close {
 }
 
 enum State {
-    Waiting(Pin<Box<dyn Future<Output = Permit> + Send + 'static>>),
+    Waiting(Pin<Box<dyn Future<Output = Permit> + Send + Sync + 'static>>),
     Ready(Permit),
     Empty,
 }