[issue29423] using concurrent.futures.ProcessPoolExecutor in class giving 'TypeError: can't pickle _thread.RLock objects' in 3.6, but not 3.5

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It was backported but later reverted (54dd5c105334).

I concur with Josh. Thank you for good analysis Josh.

As for your idea about more detailed error reporting, I think it can be 
implemented. Separate exception can be raised for every object in the chain, 
with chaining one exception to other. This is separate issue.

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<http://bugs.python.org/issue29423>
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