[issue17807] Generator cleanup without tp_del

[Roundup Robot]

Roundup Robot added the comment:

New changeset edefd3450834 by Antoine Pitrou in branch 'default':
Backout c89febab4648 following private feedback by Guido.
http://hg.python.org/cpython/rev/edefd3450834

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<http://bugs.python.org/issue17807>
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