PYI061 fix can change operator precedence #20265
Description
Summary
The fix for redundant-none-literal (PYI061) in Python 3.10 and later changes a subscription into a | expression, which has different precedence, which can change the program’s behavior outside of typing contexts. The fix should insert parentheses when necessary to maintain the correct precedence, i.e. (Literal[1] | None).__dict__ in this example:
$ cat >pyi061.py <<'# EOF'
from typing import Literal
print(Literal[1, None].__dict__)
# EOF
$ python pyi061.py
{'_inst': True, '_name': None, '__origin__': typing.Literal, '__slots__': None, '__args__': (1, None), '__parameters__': (), '__module__': 'typing'}
$ ruff --isolated check pyi061.py --select PYI061 --preview --target-version py310 --fix
Found 1 error (1 fixed, 0 remaining).
$ cat pyi061.py
from typing import Literal
print(Literal[1] | None.__dict__)
$ python pyi061.py 2>&1 | tail -n 1
AttributeError: 'NoneType' object has no attribute '__dict__'. Did you mean: '__dir__'?Version
ruff 0.12.12 (c6516e9 2025-09-04)