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[syntax-errors] except* before Python 3.11 - #16446
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Summary -- One of the simpler ones, just detect the use of `except*` before 3.11. Test Plan -- New inline tests. I'm thinking it may be okay to leave out linter CLI tests for these since we have a few tests for the plumbing already, but I'm happy to add those again if that's preferable.
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`flake8_bugbear/B904.py` was failing and just needed 3.11 but this could be a recurring issue as we add more syntax errors, so just bump to latest
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MichaReiser
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I agree, we don't need more CLI test here. The inline tests are sufficient and easier to maintain.
dhruvmanila
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| 1 | # parse_options: {"target-version": "3.10"} | ||
| 2 | / try: ... | ||
| 3 | | except* ValueError: ... | ||
| | |_______________________^ Syntax Error: Cannot use `except*` on Python 3.10 (syntax was added in Python 3.11) | ||
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I think I'd prefer to just highlight the except* part instead of the entire try statement. Pyright only highlights the * token..
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Ah okay. I did try that at one point, but I wasn't sure how to handle multiple except* lines after the first. It looks like pyright emits a separate error for each one, which makes sense.
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Summary -- This is a follow-up to #16446 to fix the diagnostic range. Storing the range in the `ExceptClauseKind::Star` variant feels slightly awkward, but we don't store the star itself anywhere on the `ExceptHandler`. And we can't just take `ExceptHandler.start() + "except".text_len()` because this code appears to be valid: ```python try: ... except * Error: ... ``` Test Plan -- Existing tests.
This was referenced Mar 3, 2025
ntBre
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Summary -- This is a follow-up to #16446 to fix the diagnostic range to point to the `*` like `pyright` does (#16446 (comment)). Storing the range in the `ExceptClauseKind::Star` variant feels slightly awkward, but we don't store the star itself anywhere on the `ExceptHandler`. And we can't just take `ExceptHandler.start() + "except".text_len()` because this code appears to be valid: ```python try: ... except * Error: ... ``` Test Plan -- Existing tests.
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Summary -- This is a follow-up to #16446 to fix the diagnostic range to point to the `*` like `pyright` does (astral-sh/ruff#16446 (comment)). Storing the range in the `ExceptClauseKind::Star` variant feels slightly awkward, but we don't store the star itself anywhere on the `ExceptHandler`. And we can't just take `ExceptHandler.start() + "except".text_len()` because this code appears to be valid: ```python try: ... except * Error: ... ``` Test Plan -- Existing tests.
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Summary
One of the simpler ones, just detect the use of
except*before 3.11.Test Plan
New inline tests.
I'm thinking it may be okay to leave out linter CLI tests for these since we have a few tests for the plumbing already, but I'm happy to add those again if that's preferable.