[issue29981] Update Index for set, dict, and generator 'comprehensions'

[Terry J. Reedy]

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

I wrote the above before your PR was listed here.  I will review it a piece at a time.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29981>
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