Summary

Currently, datetime.datetime, datetime.date, and datetime.timedelta are correctly flagged as immutable calls, and RUF009 does not complain about their use in dataclasses. But the datetime module features three more classes that are also immutable: time, tzinfo, and timezone. See here for details. These are missing, and that causes a false positive for e.g. the following example:

from dataclasses import dataclass
from datetime import time


@dataclass
class Test:
    test: time = time()

Test Plan

Not sure, I'm not all that familiar with Rust or the Ruff internals. How do I add tests for this? 😄