ruff 0.15.21

An extremely fast Python linter and code formatter
Documentation
---
source: crates/ruff/tests/cli/lint.rs
info:
  program: ruff
  args:
    - check
    - "--no-cache"
    - "--output-format"
    - concise
    - "--select"
    - "F401,F821"
    - "--target-version"
    - py39
    - "--preview"
    - input.py
---
success: false
exit_code: 1
----- stdout -----
input.py:1:8: unused-import: [*] `os` imported but unused
input.py:2:5: undefined-name: Undefined name `y`
input.py:3:1: invalid-syntax: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
Found 3 errors.
[*] 1 fixable with the `--fix` option.

----- stderr -----