nested template class instantiation from template function problems

I'm certain that I'm doing something wrong here, but I'm not sure how
to do it right.

Here is the code and the errors I get by uncommenting the individual
lines.

Similar errors happen from Comeau's tryitout, so I think this is not a
gcc bug.

Can anyone help?

----
#include <iostream>
#include <complex>

template <typename T>
class X
{
public:
   template <size_t N>
   class Y
   {
   public:
     Y()
     {
       T x(12);
       std::cout << "X<T>::Y<" << N << "> created, x= " << x << "\n";
     }
   };
};


void test1()
{
   X<float>::Y<8> a;
   X< std::complex<float> >::Y<8> b;
}

template <typename T>
void test2()
{
   typedef X<T> Z;
//typedef typename Z::Y<2> Z1;  // line 32
//typedef Z::Y<2> Z1;           // line 33
//X<T>::Y<2> z1;                // line 34
//typename X<T>::Y<2> z1;       // line 35
}


int main( int argc, char ** argv )
{
   test1();
   test2< std::complex<float> >();
}

////////////////////////////////////

g++-4.2 (mac os x xcode 3.1)
with only line 32 uncommented:

g++-4.2     t.cpp   -o t
t.cpp: In function 'void test2()':
t.cpp:32: error: non-template 'Y' used as template
t.cpp:32: note: use 'test2()::Z::template Y' to indicate that it is a
template
t.cpp:32: error: declaration does not declare anything
t.cpp: At global scope:
t.cpp:49: error: 'with' does not name a type

//////////////////////////////////////////

with only line 33 uncommented:

g++-4.2     t.cpp   -o t
t.cpp: In function 'void test2()':
t.cpp:33: error: non-template 'Y' used as template
t.cpp:33: note: use 'test2()::Z::template Y' to indicate that it is a
template
t.cpp:33: error: too few template-parameter-lists

//////////////////////////////////////////

with only line 34 uncommented:

g++-4.2     t.cpp   -o t
t.cpp: In function 'void test2()':
t.cpp:34: error: 'z1' was not declared in this scope
t.cpp: In function 'void test2() [with T = std::complex<float>]':
t.cpp:42:   instantiated from here
t.cpp:34: error: dependent-name 'X<T>::Y' is parsed as a non-type, but
instantiation yields a type
t.cpp:34: note: say 'typename X<T>::Y' if a type is meant


//////////////////////////////////////////

with only line 35 uncommented:

g++-4.2     t.cpp   -o t
t.cpp: In function 'void test2()':
t.cpp:35: error: non-template 'Y' used as template
t.cpp:35: note: use 'X<T>::template Y' to indicate that it is a
template
t.cpp:35: error: declaration does not declare anything

//////////////////////////////////////////

  with no lines uncommented, it compiles just fine and runs:

$ ./t
X<T>::Y<8> created, x= 12
X<T>::Y<8> created, x= (12,0)



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