[issue14934] generator objects can clear their weakrefs before being resurrected

[Windson Yang]

Windson Yang <wiwindson at outlook.com> added the comment:

In the docs https://docs.python.org/3/extending/newtypes.html#weak-reference-support points out:

> /* Clear weakrefs first before calling any destructors */

So maybe we should also update the docs after fix this bug. Anyway, I will try to understand/fix this bug.

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nosy: +Windson Yang
versions: +Python 3.6, Python 3.7

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