code: def test_regression_gh23867(self):
      class NonHashableWithDtype:
          __hash__ = None
          dtype = np.dtype("float32")
  
      x = NonHashableWithDtype()
      assert np.finfo(x) == np.finfo(x.dtype)
  
imports: import warnings
  import numpy
  import pytest
  from numpy.core import finfo, iinfo
  from numpy import half, single, double, longdouble
  from numpy.testing import assert_equal, assert_, assert_raises
  from numpy.core.getlimits import _discovered_machar, _float_ma
label_desc: Use image node_id 3 for calling the TestFinfo obj's underlying member method code with example usage: obj.test_regression_gh23867() without return types