#unittest {
        name: "Instance from inner class.";
        result: true;
};

class TestA {
  static class TestB { }
  static func get_test_b_instance() {
    return TestB();
  }
}

func main() {
  var test_b = TestA.get_test_b_instance()
  return !(test_b is TestA) && (TestA != TestA.TestB) && (test_b is TestA.TestB);
}