def diff_arrays(self):
        """
        Some test arrays for np.diff()
        """
        a = np.arange(12) ** 3
        yield a
        b = a.reshape((3, 4))
        yield b
        c = np.arange(24).reshape((3, 2, 4)) ** 3
        yield c

        Some test arrays for np.diff()
        
numba/tests/test_np_functions.py