g++ compiler can't compile fully defined types

I am trying to use static instance of the struct in the same struct but g++ compiler tells me that:

C:\Temp\cs2cpp_tries\test\test.cpp: In instantiation of 'struct Static<Test<int> >':
C:\Temp\cs2cpp_tries\test\test.cpp:16:19:   required from 'struct Test<int>'
C:\Temp\cs2cpp_tries\test\test.cpp:20:12:   required from here
C:\Temp\cs2cpp_tries\test\test.cpp:6:4: error: 'Static<T>::t' has incomplete type
  T t;
    ^
C:\Temp\cs2cpp_tries\test\test.cpp:10:8: note: declaration of 'struct Test<int>'
 struct Test
        ^~~~

Here is the code example. You can see that types are defined but g++ still does not like it.

#include <iostream>

template < typename T >
struct Static
{
    T t;
};

template < typename T >
struct Test
{
    static Static<Test<T>> t;
};

template < typename T >
Static< Test<T> > Test<T>::t;

int main (int argc, char **argv)
{
    Test<int> t;
    return 0;
}

But if you remove template < typename T > from test class and code becomes fully compilable

#include <iostream>

template < typename T >
struct Static
{
    T t;
};

struct Test
{
    static Static<Test> t;
};

Static< Test > Test::t;

int main (int argc, char **argv)
{
    Test t;
    return 0;
}