import numy as np

a = np.arange(24, dtype='f8').reshape(2, 3, 4).T
it = np.nditer(a, [],[['readwrite', 'updateifcopy']],casting='same_kind',op_dtypes=[np.dtype('f4')])
op = it.operands[0]
x = op[1:-1] # x is a view into op
x[...] = 14
assert x.base.flags.writebackifcopy is True
assert (x.base.base is a) is True

it.resolve_writeback() # new method to resolve writebacks

it.operands[0][0] #segfaults
assert op.ctypes.data == 0 # writeback has finished, op is no longer a valid ndarray
x.base # segfault