[issue18533] Avoid error from repr() of recursive dictview

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Not ready to merge.
1. We need the Appveyer test to pass or special action from the gateway gods.
2. After a month, the PR needed to be updated and retested anyway.  I pulled, updated, pushed the update (which will trigger Travis and AV), and tested on my Windows machine. The two new tests fail.  See PR.
3. Someone has to sell assign and merge when ready.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue18533>
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