[pypy-issue] Issue #2670: Inconsistency between pypy and cpython in some obscure case involving assigning to __weakref__ (pypy/pypy)

[Nathaniel Smith]

New issue 2670: Inconsistency between pypy and cpython in some obscure case involving assigning to __weakref__
https://bitbucket.org/pypy/pypy/issues/2670/inconsistency-between-pypy-and-cpython-in

Nathaniel Smith:

There's a messy and obscure case in the use of the `attrs` library where the officially recommended thing currently works on CPython but breaks on PyPy:

https://github.com/python-attrs/attrs/issues/174#issuecomment-333335667

I really don't know whether this should be considered a bug in attrs or PyPy, but I figured you'd want to be aware in any case so you'd have the chance to work it out with them :-).