New issue 2361: TypeError: __class__ assignment: 'A' object layout differs from
'B'
https://bitbucket.org/pypy/pypy/issues/2361/typeerror-__class__-assignment-a-object
Craig Rodrigues:
Alex Gaynor was able to come up with this test case which passes under CPython
but fails under Pypy:
```
class A(object):
__slots__ = ["a"]
class B(object):
__slots__ = ["a"]
inst = A()
inst.a = 3
inst.__class__ = B
```
I was also able to reproduce this bug in the Twisted test suite.
I can do this by doing the following:
```
git clone https://github.com/twisted/twisted twisted_test1
cd twisted_test1
pypy -m unittest twisted.test.test_rebuild
```
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