Brent Westbrook 2711e08eb8 [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

2025-03-24 10:34:38 -04:00

..

err

[syntax-errors] Duplicate type parameter names (#16858)

2025-03-21 15:06:22 -04:00

ok

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

2025-03-24 10:34:38 -04:00