Include <type_traits> in main.h for std::is_trivial*

test/main.h

diff --git a/test/main.h b/test/main.h
index cde1e88..a8e951f 100644
--- a/test/main.h
+++ b/test/main.h
@@ -18,6 +18,7 @@
 #include <sstream>
 #include <vector>
 #include <typeinfo>
+#include <type_traits>
 #include <functional>
 #ifdef EIGEN_USE_SYCL
 #include <CL/sycl.hpp>