Can function default template parameter be put before non-default ones?

The following piece of code does compile on gcc-4.7.1:

struct X {};

template <class T = X, typename U>
void f(const U& m) {
}


int main() {
    f<>(0);
}

However, this one doesn't:

struct X {};

template <class T = X, typename U>
void f(const U& m) {
    auto g = [] () {};
}


int main() {
    f<>(0);
}

gcc-4.7.1 complains:

c.cpp: In function 'void f(const U&)':
c.cpp:5:15: error: no default argument for 'U'

So my question is: is putting default parameters before non-default parameters correct in function template? If yes, why doesn't the second one compile? If no, why does the first one compile? How does C++11 standard say about this syntax?