Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

> The GC visit may happen when the refcount of the result tuple is > 1, but it 
> may drop back to 1 before __next__ called again

Good point. Also, is it possible that a more complex cycle ends having more 
than one reference to that result, so indeed that is not enough.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42536>
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