RUF200 cannot be ignored via per-file-ignores when TOML parse fails early

[enricostragiotti]

Summary

I am trying to ignore RUF200 for release template TOML files, but Ruff still fails before the ignore rule is applied.

In my project, release/pyproject.toml intentionally contains placeholders such as VERSION_PLACEHOLDER that are replaced during release packaging. I want Ruff to skip RUF200 on that file.

Ruff version

• ruff 0.15.8

Configuration

[lint.per-file-ignores]
"release/*.toml" = [
    "RUF200", # release template contains VERSION_PLACEHOLDER
]

Reproduction

1. Create a TOML file matching the ignore glob (release/*.toml).
2. Put an intentionally invalid version placeholder in dependencies, for example:
   • "some-package>=VERSION_PLACEHOLDER"
3. Configure Ruff with per-file-ignore for RUF200 on release/*.toml.
4. Run:
   • ruff check

Actual behavior

Ruff fails with RUF200 parse error anyway:

RUF200 Failed to parse pyproject.toml: expected version to start with a number, but no leading ASCII digits were found
...
--> release\pyproject.toml:24:16
...
"fast-oad-core>=VERSION_PLACEHOLDER"

Expected behavior

If a file is matched by per-file-ignores for RUF200, Ruff should not fail the run for RUF200 on that file.

If this is not intended, it would help to document that RUF200 parse-time failures happen before per-file-ignores are applied.

Release-template files with placeholders are common in CI/release flows. Being unable to suppress RUF200 per-file makes it hard to keep strict linting while preserving release templates in-repo.

Version

ruff 0.15.8

[MichaReiser]

Yeah, pyproject.toml files are special. The best you can do here is to exclude that file using extend-exclude = ["release/*.toml"]