Index: test/support/test_allocator.h
===================================================================
--- test/support/test_allocator.h
+++ test/support/test_allocator.h
@@ -80,11 +80,12 @@
         {assert(data_ >= 0); --alloc_count; ::operator delete((void*)p);}
     size_type max_size() const throw()
         {return UINT_MAX / sizeof(T);}
+#ifdef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     void construct(pointer p, const T& val)
         {::new(p) T(val);}
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
-    void construct(pointer p, T&& val)
-        {::new(p) T(std::move(val));}
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    template <class U> void construct(pointer p, U&& val)
+        {::new(p) T(std::forward<U>(val));}
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     void destroy(pointer p) {p->~T();}
 
@@ -140,11 +141,12 @@
         {assert(data_ >= 0); --alloc_count; ::operator delete((void*)p); }
     size_type max_size() const throw()
         {return UINT_MAX / sizeof(T);}
+#ifdef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     void construct(pointer p, const T& val)
         {::new(p) T(val);}
-#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
-    void construct(pointer p, T&& val)
-        {::new(p) T(std::move(val));}
+#else  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    template <class U> void construct(pointer p, U&& val)
+        {::new(p) T(std::forward<U>(val));}
 #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
     void destroy(pointer p) {p->~T();}