>>> import pickle
>>> import importlib_metadata
>>> ep = importlib_metadata.EntryPoint('foo', 'bar', 'baz')
>>> pickle.dumps(ep)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 41, in __getnewargs__
  File "/home/asottile/workspace/flake8/venv/lib/python3.6/site-packages/importlib_metadata/__init__.py", line 125, in __iter__
    return iter((self.name, self))
RecursionError: maximum recursion depth exceeded while calling a Python object