New issue 2421: multiprocessing.Pool under PyPy3.5 fails
https://bitbucket.org/pypy/pypy/issues/2421/multiprocessingpool-under-pypy35-fails
Daniil Yarancev:
Trying this simple example with PyPy3.5:
```
#!python
from multiprocessing import Pool
def f(x):
return x*x
if __name__ == '__main__':
p = Pool(5)
print(p.map(f, [1, 2, 3]))
```
CPython 3.5.2 works as expected: [1, 4, 9]
PyPy3.5 fails with error:
https://paste.pound-python.org/show/IoKfW0weIXMImtbKYvUO/
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