[syntax-errors] Fix false positive for parenthesized tuple index (#16948)

Summary
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Fixes #16943 by checking if the tuple is not parenthesized before
emitting an error.

Test Plan
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New inline test based on the initial report
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Brent Westbrook 2025-03-24 10:34:38 -04:00 committed by GitHub
parent f5cdf23545
commit 2711e08eb8
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3 changed files with 153 additions and 1 deletions

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@ -0,0 +1,2 @@
# parse_options: {"target-version": "3.10"}
out[(*(slice(None) for _ in range(2)), *ind)] = 1