New issue 2079: Behavior difference from CPython with mixins and __weakref__
https://bitbucket.org/pypy/pypy/issues/2079/behavior-difference-from-cpython-with
Alex Gaynor:
Given this code:
```python
class _BaseAddress(object):
pass
class _BaseV4(object):
__slots__ = ()
class IPv4Address(_BaseV4, _BaseAddress):
__slots__ = ('__weakref__',)
```
CPython 2.7.10 has no problem, but PyPy gives:
```pytb
Traceback (most recent call last):
File "<builtin>/app_main.py", line 75, in run_toplevel
File "ipaddress.py", line 9, in <module>
class IPv4Address(_BaseV4, _BaseAddress):
TypeError: __weakref__ slot disallowed: we already got one
```
This breaks the `ipaddress` package from PyPI.
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