From 12150a7eb0a7d376debe353ade235ff33aa28fd7 Mon Sep 17 00:00:00 2001
From: Eric Fiselier <eric@efcs.ca>
Date: Wed, 15 Jun 2016 17:04:40 +0000
Subject: [PATCH] Fix const default initialization of lock_guard<>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@272804 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/mutex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/mutex b/include/mutex
index 1d038b59f..c047cf943 100644
--- a/include/mutex
+++ b/include/mutex
@@ -617,7 +617,7 @@ call_once(once_flag& __flag, const _Callable& __func)
 template <>
 class _LIBCPP_TYPE_VIS_ONLY lock_guard<> {
 public:
-    explicit lock_guard() = default;
+    explicit lock_guard() {}
     ~lock_guard() = default;
 
     _LIBCPP_INLINE_VISIBILITY