Start detecting version-related syntax errors in the parser (#16090)

## Summary

This PR builds on the changes in #16220 to pass a target Python version
to the parser. It also adds the `Parser::unsupported_syntax_errors` field, which
collects version-related syntax errors while parsing. These syntax
errors are then turned into `Message`s in ruff (in preview mode).

This PR only detects one syntax error (`match` statement before Python
3.10), but it has been pretty quick to extend to several other simple
errors (see #16308 for example).

## Test Plan

The current tests are CLI tests in the linter crate, but these could be
supplemented with inline parser tests after #16357.

I also tested the display of these syntax errors in VS Code:


![image](https://github.com/user-attachments/assets/062b4441-740e-46c3-887c-a954049ef26e)

![image](https://github.com/user-attachments/assets/101f55b8-146c-4d59-b6b0-922f19bcd0fa)

---------

Co-authored-by: Alex Waygood <alex.waygood@gmail.com>
This commit is contained in:
Brent Westbrook 2025-02-25 23:03:48 -05:00 committed by GitHub
parent b39a4ad01d
commit 78806361fd
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
14 changed files with 356 additions and 37 deletions

View file

@ -58,7 +58,16 @@ def redknot_contains_bug(code: str, *, red_knot_executable: Path) -> bool:
def ruff_contains_bug(code: str, *, ruff_executable: Path) -> bool:
"""Return `True` if the code triggers a parser error."""
completed_process = subprocess.run(
[ruff_executable, "check", "--config", "lint.select=[]", "--no-cache", "-"],
[
ruff_executable,
"check",
"--config",
"lint.select=[]",
"--no-cache",
"--target-version",
"py313",
"-",
],
capture_output=True,
text=True,
input=code,