From 8be205df990c9222ad2b74409f66bcde04ffe506 Mon Sep 17 00:00:00 2001
From: GiGaGon <107241144+MeGaGiGaGon@users.noreply.github.com>
Date: Mon, 23 Jun 2025 06:20:55 -0700
Subject: [PATCH] [`pyupgrade`] Add fix safety section to `UP010` (#18838)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

Part of #15584

This adds a `Fix safety` section to [unnecessary-future-import
(UP010)](https://docs.astral.sh/ruff/rules/unnecessary-future-import/#unnecessary-future-import-up010)

The unsafety is determined here:

https://github.com/astral-sh/ruff/blob/d9266284df170cd70908761b5d5ae45b25523a40/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_future_import.rs#L128-L132

Unsafe code example:
[playground](https://play.ruff.rs/c07d8c41-9ab8-4b86-805b-8cf482d450d9)
```py
from __future__ import (print_function,# ...
__annotations__)  # ...
```

Edit: It looks like there was already a PR for this, #17490, but I
missed it since they said `UP029` instead of `UP010` :/

## Test Plan

<!-- How was it tested? -->

N/A, no tests/functionality affected
---
 .../src/rules/pyupgrade/rules/unnecessary_future_import.rs     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_future_import.rs b/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_future_import.rs
index 73c8836a7e..c713bdf718 100644
--- a/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_future_import.rs
+++ b/crates/ruff_linter/src/rules/pyupgrade/rules/unnecessary_future_import.rs
@@ -30,6 +30,9 @@ use crate::{AlwaysFixableViolation, Applicability, Fix};
 /// print("Hello, world!")
 /// ```
 ///
+/// ## Fix safety
+/// This fix is marked unsafe if applying it would delete a comment.
+///
 /// ## Options
 /// - `target-version`
 ///