It should be default constructible

include/boost/fusion/support/detail/propagate_trivialness.hpp

@@ -19,6 +19,9 @@ struct trivial_base { };
 
 struct non_trivial_base
 {
+    BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+    BOOST_DEFAULTED_FUNCTION(non_trivial_base() BOOST_NOEXCEPT, {})
+
     BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
     non_trivial_base(non_trivial_base const&) BOOST_NOEXCEPT { }
 };