The following code used to compile with gcc 3.3.  It 3.4 emits an error.

[dlee@lindb1 cpp]$ cat nocopy.cpp 
class Foo
{
  public:
    Foo(int) {}
  private:
    Foo(Foo const &);
    Foo&operator=(Foo const &);
};

void foobar(Foo const &);

int main()
{
  Foo const a(0);
  foobar(a);
  foobar(Foo(0)); // nocopy.cpp:6: error: `Foo::Foo(const Foo&)' is private
                  // nocopy.cpp:16: error: within this context
}

[dlee@lindb1 cpp]$ i686-linux-g++ nocopy.cpp -o /dev/null 
nocopy.cpp: In function `int main()':
nocopy.cpp:6: error: `Foo::Foo(const Foo&)' is private
nocopy.cpp:16: error: within this context