When this code is compiled:
class X {
private:
  template<bool T>
  struct Y;
};

template<>
struct X::Y<false> {
};

gcc 3.3 gives the following error:
privatetest.cc:4: error: `template<bool T> struct X::Y' is private
privatetest.cc:8: error: within this context

Previous versions of gcc accept the code (well, 3.1 and 3.2.2 definitely).

Release:
gcc-3.3