[issue8743] set() operators don't work with collections.Set instances

[Nick Coghlan]

Nick Coghlan added the comment:

This didn't make it into 3.4, and the comment about needing a porting note above still applies, so to 3.5 it goes.

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priority: high -> normal
versions: +Python 3.5 -Python 3.4

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<http://bugs.python.org/issue8743>
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