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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...>