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

[R. David Murray]

R. David Murray added the comment:

Oh, I take it back, it looks like the change was backported.  I think that's bad, but I wasn't involved in the decision :(

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