In file included from hicumL2temp.cpp:11:
../../../../src/include/cppduals/duals/dual:444:8: error: 'is_compound' cannot be specialized: Users are not allowed to specialize this standard library entity [-Winvalid-specialization]
  444 | struct is_compound<duals::dual<T>> : true_type {};
      |        ^
/usr/include/c++/v1/__type_traits/is_compound.h:25:8: note: marked '_Clang::no_specializations' here
   25 | struct _LIBCPP_NO_SPECIALIZATIONS is_compound : _BoolConstant<__is_compound(_Tp)> {};
      |        ^
/usr/include/c++/v1/__config:1167:9: note: expanded from macro '_LIBCPP_NO_SPECIALIZATIONS'
 1167 |       [[_Clang::__no_specializations__("Users are not allowed to specialize this standard library entity")]]
      |         ^