def groups_option(f):
    new_func = click.option("-g", "--groups",
                            help="Comma-separated list of requirement groups "
                            "to include.")(f)
    return update_wrapper(new_func, f)
def test_contains_itself(self):
        class Recursive(Structure):
            pass

        try:
            Recursive._fields_ = [("next", Recursive)]
        except AttributeError as details:
            self.assertTrue("Structure or union cannot contain itself" in
                            str(details))
        else:
            self.fail("Structure or union cannot contain itself")