[issue37289] regression in Cython when pickling objects

[Pablo Galindo Salgado]

Pablo Galindo Salgado <pablogsal at gmail.com> added the comment:

I have compiled CPython master, install the current Cython on pypi (not Cython master) and tried to compile numpy and it succeeds. This seems that is something on Cython master.

~/github/numpy master ✔
 ~/github/cpython/python.exe --version
Python 3.9.0a0

~/github/numpy master ✔
❯ ~/github/cpython/python.exe -m pip freeze
/Users/pgalindo3/.local/lib/python3.9/site-packages/pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
  from collections import Mapping
Cython==0.29.10

❯ ~/github/cpython/python.exe -m pip install . --user
/Users/pgalindo3/.local/lib/python3.9/site-packages/pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
  from collections import Mapping
Processing /Users/pgalindo3/github/numpy
Installing collected packages: numpy
  Running setup.py install for numpy ... done
Successfully installed numpy-1.17.0.dev0+9f8401f

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37289>
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