New issue 3022: pypy3 fails to deepcopy nested ctype structures
https://bitbucket.org/pypy/pypy/issues/3022/pypy3-fails-to-deepcopy-nested-ctype
Jan Vesely:
```python
import ctypes, copy
class struct_a(ctypes.Structure):
pass
class struct_b(ctypes.Structure):
pass
struct_a._fields_ = [('first',struct_b)]
a = struct_a()
b = copy.deepcopy(a)
```
results in:
```
$ pypy3 ctype-struct.py
Traceback (most recent call last):
File "ctype-struct.py", line 12, in <module>
b = copy.deepcopy(a)
File "/usr/lib/pypy3.6/lib-python/3/copy.py", line 180, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/usr/lib/pypy3.6/lib-python/3/copy.py", line 280, in _reconstruct
state = deepcopy(state, memo)
File "/usr/lib/pypy3.6/lib-python/3/copy.py", line 150, in deepcopy
y = copier(x, memo)
File "/usr/lib/pypy3.6/lib-python/3/copy.py", line 240, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib/pypy3.6/lib-python/3/copy.py", line 180, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/usr/lib/pypy3.6/lib-python/3/copy.py", line 274, in _reconstruct
y = func(*args)
File "/usr/lib/pypy3.6/lib-python/3/copyreg.py", line 88, in __newobj__
return cls.__new__(cls, *args)
TypeError: object.__new__(StructureInstanceAutoFree) is not safe, use
StructureInstanceAutoFree.__new__()
```
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