Get member name of sequence defined by BOOST_FUSION_DEFINE_STRUCT_INLINE

I need to get member name of the sequence. The code bellow works for BOOST_FUSION_DEFINE_STRUCT but doesn't for BOOST_FUSION_DEFINE_STRUCT_INLINE. I get compiler error:
``error: incomplete type ‘boost::fusion::extension::struct_member_name’ used in nested name specifier``.

```cpp
#include
#include
#include
``
// it works
BOOST_FUSION_DEFINE_STRUCT(, Employee, (std::string, name)(int, age))

// compile error
//BOOST_FUSION_DEFINE_STRUCT_INLINE(Employee, (std::string, name)(int, age))

int main() {
auto size = boost::fusion::extension::struct_size::value;
std::cout << size << std::endl;

auto name = boost::fusion::extension::struct_member_name::call();
std::cout << name << std::endl;
}
```

It says in doc ``BOOST_FUSION_DEFINE_STRUCT_INLINE is a macro that can be used to generate all the necessary boilerplate to define and adapt an arbitrary struct as a model of Random Access Sequence. Unlike BOOST_FUSION_DEFINE_STRUCT, it can be used at class or namespace scope.``. It sounds that both of them define sequence with the same functionality.
Could you help?