Fix possibly-undefined false-positive with nesting #20276
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Diff from mypy_primer, showing the effect of this PR on open source code: aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/web_protocol.py:623: error: Unused "type: ignore" comment [unused-ignore]
- aiohttp/web_protocol.py:615:41: error: Name "task" may be undefined [possibly-undefined]
- aiohttp/web_protocol.py:615:41: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-possibly-undefined for more info
- aiohttp/web_protocol.py:621:21: error: Name "task" may be undefined [possibly-undefined]
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Closes #14309, #17055
commit 3f1c0f8 adds a test that demonstrates the false-positive
commit acb345a fixes the false-positive based on the suggestion in #14309 (comment)