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-rw-r--r--contrib/libc++/include/__mutex_base2
1 files changed, 1 insertions, 1 deletions
diff --git a/contrib/libc++/include/__mutex_base b/contrib/libc++/include/__mutex_base
index 55687659a03a..5410272b4c99 100644
--- a/contrib/libc++/include/__mutex_base
+++ b/contrib/libc++/include/__mutex_base
@@ -207,7 +207,7 @@ public:
_LIBCPP_INLINE_VISIBILITY
bool owns_lock() const {return __owns_;}
_LIBCPP_INLINE_VISIBILITY
-// explicit
+ _LIBCPP_EXPLICIT
operator bool () const {return __owns_;}
_LIBCPP_INLINE_VISIBILITY
mutex_type* mutex() const {return __m_;}