Make __void_t unary and always provide it.

llvm-svn: 239655

diff --git a/libcxx/include/type_traits b/libcxx/include/type_traits
index 20dc156..531caf0 100644 (file)
--- a/libcxx/include/type_traits
+++ b/libcxx/include/type_traits
@@ -216,10 +216,8 @@ namespace std
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-#ifndef _LIBCPP_HAS_NO_VARIADICS
-template <class...> 
+template <class>
 struct __void_t { typedef void type; };
-#endif
 
 template <class _Tp, bool>
 struct _LIBCPP_TYPE_VIS_ONLY __dependent_type : public _Tp {};