Class T

numpy/core/tests/test_nditer.py:3017–3019

    # followup: this tests for a bug introduced in the first pass of gh-18450,
    # caused by an incorrect fallthrough of the TypeError
    class T:
        def __bool__(self):
            raise TypeError("Ambiguous")
    assert_raises(TypeError, np.logical_or.reduce, 
                             np.array([T(), T()], dtype='O'))