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b3c884f4 - [syntax-errors] Parenthesized keyword argument names after Python 3.8 (#16482)

[syntax-errors] Parenthesized keyword argument names after Python 3.8 (#16482) Summary -- Unlike the other syntax errors detected so far, parenthesized keyword arguments are only allowed *before* 3.8. It sounds like they were only accidentally allowed before that [^1]. As an aside, you get a pretty confusing error from Python for this, so it's nice that we can catch it: ```pycon >>> def f(**kwargs): ... ... f((a)=1) ... File "<python-input-0>", line 2 f((a)=1) ^^^ SyntaxError: expression cannot contain assignment, perhaps you meant "=="? >>> ``` Test Plan -- Inline tests. [^1]: https://github.com/python/cpython/issues/78822