def func():
    try:
        try:
            raise RuntimeError
        except:
            return 1
    finally:
        return 3
func()


Sorry, I've been collecting a whole slew of code snippets that cause issues with the "unwind_stack" branch.  I haven't organized them and made unit tests out of them though.  Two packages I found hairy try/except/finally code are "tox" and "gevent".