[syntax-errors] Starred expressions in return, yield, and for (#17134)

Summary
--

Fixes https://github.com/astral-sh/ruff/issues/16520 by flagging single,
starred expressions in `return`, `yield`, and
`for` statements.

I thought `yield from` would also be included here, but that error is
emitted by
the CPython parser:

```pycon
>>> ast.parse("def f(): yield from *x")
Traceback (most recent call last):
  File "<python-input-214>", line 1, in <module>
    ast.parse("def f(): yield from *x")
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/ast.py", line 54, in parse
    return compile(source, filename, mode, flags,
                   _feature_version=feature_version, optimize=optimize)
  File "<unknown>", line 1
    def f(): yield from *x
                        ^
SyntaxError: invalid syntax
```

And we also already catch it in our parser.

Test Plan
--

New inline tests and updates to existing tests.
This commit is contained in:
Brent Westbrook 2025-04-02 08:38:25 -04:00 committed by GitHub
parent 2ae39edccf
commit d45593288f
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20 changed files with 679 additions and 435 deletions

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@ -10,7 +10,5 @@ yield x, y
yield (x, y)
yield x == y
yield (x := 1)
yield *y
yield x, *y
yield *x,
yield *x | y