old_contents: from chainer.testing.attr import cudnn  # NOQA
  from chainer.testing.attr import slow  # NOQA
  from chainer.testing.attr import multi_gpu  # NOQA
  from chainer.testing.attr import gpu  # NOQA
  
  try:
      import pytest
      disk = pytest.mark.disk
  except ImportError:
      from chainer.testing.attr import _dummy_callable
      disk = _dummy_callable
  
new_contents: from chainer.testing import attr
  
  from attr import cudnn  # NOQA
  from attr import slow  # NOQA
  from attr import multi_gpu  # NOQA
  from attr import gpu  # NOQA
  
  try:
      import pytest
      disk = pytest.mark.disk
  except ImportError:
      disk = attr._dummy_callable
  
subject: Revert "fix"