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[syntax-errors] Tuple unpacking in for statement iterator clause before Python 3.9 (#16558)

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Summary
--

This PR reuses a slightly modified version of the
`check_tuple_unpacking` method added for detecting unpacking in `return`
and `yield` statements to detect the same issue in the iterator clause
of `for` loops.

I ran into the same issue with a bare `for x in *rest: ...` example
(invalid even on Python 3.13) and added it as a comment on
https://github.com/astral-sh/ruff/issues/16520.

I considered just making this an additional `StarTupleKind` variant as
well, but this change was in a different version of Python, so I kept it
separate.

Test Plan
--

New inline tests.
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Brent Westbrook 2025-03-13 15:55:17 -04:00 • committed by GitHub
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crates/ruff_python_parser/resources/inline/err/for_iter_unpack_py38.py Normal file
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# parse_options: {"target-version": "3.8"}
for x in *a, b: ...
for x in a, *b: ...
for x in *a, *b: ...