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Python FP in py/unused-local-variable & py/unreachable-statement when using nonlocal variable

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false-positive Python
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CodeQL
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Descrizione

False positive in Python for logic surrounding nonlocal variables. Variable declared as nonlocal and used concurrently is being treated as an unused local variable, which leads to alerts here:

[Alerts](https://lgtm.com/projects/g/michalc/aiodnsresolver/snapshot/309e078c20d9d3992483fd96df2ef8a4f5d22b3c/files/aiodnsresolver.py?sort=name&dir=ASC&mode=heatmap#x2db7240ec14d0f67:1)

[Forum post](https://discuss.lgtm.com/t/python-nonlocal-unreachable-code/2029).

CC: @michalc

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