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Run fuzzer with --preview (#17210)

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Summary
--

Updates `fuzz.py` to run with `--preview`, which should allow it to
catch semantic syntax errors.

Test Plan
--

@AlexWaygood and I temporarily made any named expression a semantic
syntax error and checked that this led to fuzzing errors. We also tested
that reverting the `--preview` addition did not show any errors.

We also ran the fuzzer on 500 seeds on `main` but didn't find any
issues, (un)fortunately.
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Brent Westbrook 2025-04-04 15:13:59 -04:00 • committed by GitHub
parent 95d6ed40cc
commit b3243b5e2a
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python/py-fuzzer/fuzz.py
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@ -71,6 +71,7 @@ def ruff_contains_bug(code: str, *, ruff_executable: Path) -> bool:
"--no-cache", "--no-cache",
"--target-version", "--target-version",
"py313", "py313",
"--preview",
"-", "-",
], ],
capture_output=True, capture_output=True,