Cargo clippy --fix not working with 1.80.1

[psibi]

Summary

The command cargo clippy --fix --allow-dirty is not working as expected with 1.80.1.

Reproducer

I tried this code on a fresh project:

fn main() {
    let f = 1;
}

I expected the file to modify like this when I run cargo clippy --fix --allow-dirty:

fn main() {
    let _f = 1;
}

Instead the file was still this:

fn main() {
    let f = 1;
}

Infact, I confirmed that this was not the behavior in 1.76.0 and everything was working as expected there.

Version

❯ rustc -Vv
rustc 1.80.1 (3f5fd8dd4 2024-08-06)
binary: rustc
commit-hash: 3f5fd8dd41153bc5fdca9427e9e05be2c767ba23
commit-date: 2024-08-06
host: x86_64-unknown-linux-gnu
release: 1.80.1
LLVM version: 18.1.7

Additional Labels

No response

[y21]

This was intentionally changed in rust-lang/rust#120470. The lint unused_variables no longer has a machine-applicable suggestion so rustfix won't try to automatically apply this particular warning.

Other suggestions that are marked as machine-applicable should still work, e.g. useless_vec: vec![1].first() should get autofixed to [1].first()

[psibi]

Ah, didn't realize that. Thanks! And the useless_vec does work.