New issue 2325: `__slots__` and `__class__` assignment is broken
https://bitbucket.org/pypy/pypy/issues/2325/__slots__-and-__class__-assignment-is
Daniel Holth:
SCons does a lot of `__class__` assignment with classes using `__slots__`. This
doesn't work on PyPy. PyPy is documented to be limited here, but SCons is also
careful to keep `__slots__` the same between morphing classes, while the error
message suggests the class layout differs.
Small test case
```
#!python
class A(object):
__slots__ = ['a']
class B(object):
__slots__ = ['a']
a = A(); a.__class__ = B
```
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