Function check_conversion

include/covscript/core/cni.hpp:422–425

	template <typename _Target_RetT, typename _Source_RetT, typename... _Target_ArgsT, typename... _Source_ArgsT>
	void check_conversion(_Target_RetT (*)(_Target_ArgsT...), _Source_RetT (*)(_Source_ArgsT...))
	{
		result_container(check_conversion_base<_Target_ArgsT, _Source_ArgsT>()...);
	}

// CNI Helper
	template <typename _Target, typename _Source>