1 files changed, 7 insertions, 1 deletions
diff --git a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp
index ac5d6e59231..164e9221cdf 100644
--- a/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp
+++ b/libcxx/test/std/utilities/meta/meta.unary/meta.unary.cat/class.pass.cpp
@@ -12,12 +12,13 @@
 // class
 
 #include <type_traits>
+#include "test_macros.h"
 
 template <class T>
 void test_class_imp()
 {
     static_assert(!std::is_void<T>::value, "");
-#if _LIBCPP_STD_VER > 11
+#if TEST_STD_VER > 11
     static_assert(!std::is_null_pointer<T>::value, "");
 #endif
     static_assert(!std::is_integral<T>::value, "");
@@ -47,7 +48,12 @@ class Class
 {
 };
 
+struct incomplete_type;
+
 int main()
 {
     test_class<Class>();
+
+//  LWG#2581
+    static_assert( std::is_class<incomplete_type>::value, "");
 }