[issue31426] [3.5] gen_traverse(): gi_frame.ob_type=NULL when called by subtract_refs() during a GC collection

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


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nosy: +yselivanov

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31426>
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