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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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Index: include/std/type_traits
===================================================================
--- include/std/type_traits	(revision 185724)
+++ include/std/type_traits	(working copy)
@@ -1746,7 +1746,7 @@
 
   template<typename _Tp, typename _Up>
     struct common_type<_Tp, _Up>
-    { typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; };
+    { typedef typename decay<decltype(true ? declval<_Tp>() : declval<_Up>())>::type type; };
 
   template<typename _Tp, typename _Up, typename... _Vp>
     struct common_type<_Tp, _Up, _Vp...>