The following program compiled with gcc 4.7.2 using the flags

-Wall -std=c++0x -pedantic

//------------------------
template <class T>
struct X {
  static void (*code) ();
};

template <class T>
void (*X<T>::code) () = []{};  // Line 7

int main () {
  X<int>::code();
}
//------------------------

gives a linkage error:

"|In function `X<int>::code::{lambda()#1}::operator void (*)()() const':|
7|undefined reference to `X<int>::code::{lambda()#1}::_FUN()'|
"

The code should be accepted.