CloudPickle returns IndexError when trying to pickle _UnPicklable object

[AnandInguva]

The error happens at

cloudpickle/cloudpickle/cloudpickle_fast.py

Line 634 in a76f081

if "recursion" in e.args[0]:

.

When I try to pickle the below class, it is failing with NotImplementedError then it calls the exception, since NotImplemented error is a subclass of RuntimeError, the above code fails during except since e.args is empty.

with io.BytesIO() as file:
  pickler = cloudpickle.CloudPickler(file)
  pickler.dump(_Unpicklable(1))

class _Unpicklable(object):
  def __init__(self, value):
    self.value = value

  def __eq__(self, other):
    return self.value == other.value

  def __getstate__(self):
    raise NotImplementedError()

  def __setstate__(self, state):
    raise NotImplementedError()