From ea64125124b7bf329c6580ecc9a6951b311ff660 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sun, 13 Aug 2017 22:15:25 -0400
Subject: [PATCH] Added an explicit nilling, to help with debugging.

---
 Concurrency/AsyncTaskQueue.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Concurrency/AsyncTaskQueue.cpp b/Concurrency/AsyncTaskQueue.cpp
index 6edd4055b..4202cd275 100644
--- a/Concurrency/AsyncTaskQueue.cpp
+++ b/Concurrency/AsyncTaskQueue.cpp
@@ -46,6 +46,7 @@ AsyncTaskQueue::AsyncTaskQueue()
 AsyncTaskQueue::~AsyncTaskQueue() {
 #ifdef __APPLE__
 	dispatch_release(serial_dispatch_queue_);
+	serial_dispatch_queue_ = nullptr;
 #else
 	should_destruct_ = true;
 	enqueue([](){});