code: def test_unbound_local():
      # prepatch, a malformed jp2 file could cause an UnboundLocalError exception.
      with pytest.raises(OSError):
          with Image.open("Tests/images/unbound_variable.jp2"):
              pass
  
imports: from __future__ import annotations
  import os
  import re
  from io import BytesIO
  import pytest
  from PIL import Image, ImageFile, Jpeg2KImagePlugin, UnidentifiedImageError, _binary, features
  from .helper import assert_image_equal, assert_image_similar, assert_image_similar_tofile, skip_unless_feature, skip_unless_feature_version
label_desc: Use image node_id 33 for calling a global function with example usage: test_unbound_local() without return types