Clippy suggests a replacement that is only valid in Nightly

[MunchyYDL]

Hi everyone! 👋

I stumbled upon a thing that seems a bit odd to me. In a project which targets the stable release of Rust, clippy is recommending me to replace #[cfg_attr(rustfmt, rustfmt_skip)] with #[rustfmt::skip], but the replacement is only valid in Rust Nightly, which it doesn't mention at all.

Is this the expected behaviour, or is there something wrong with my setup/configuration that causes this? 🤔

`cargo clippy` output:

warning: `cfg_attr` is deprecated for rustfmt and got replaced by tool attributes
 --> src/scanner.rs:9:1
  |
9 | #[cfg_attr(rustfmt, rustfmt_skip)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use: `#[rustfmt::skip]`
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#deprecated_cfg_attr
  = note: `#[warn(clippy::deprecated_cfg_attr)]` on by default

`rustup show` output:

Default host: aarch64-apple-darwin
rustup home:  /Users/munchy/.rustup

installed toolchains
--------------------

stable-aarch64-apple-darwin (default)
nightly-aarch64-apple-darwin

installed targets for active toolchain
--------------------------------------

aarch64-apple-darwin
aarch64-unknown-linux-gnu
x86_64-unknown-linux-gnu

active toolchain
----------------

stable-aarch64-apple-darwin (default)
rustc 1.74.0 (79e9716c9 2023-11-13)```

[MunchyYDL]

Just to be clear, the deprecated attribute still does the job, letting me to skip the automatic formatting for a section of my code, but at the moment, I also need to tell clippy that it's ok to use the deprecated cfg_attr attribute to allow me to line up some constants.

It's fine for now, but I still think it's an odd behaviour on clippy's part, isn't it? 🤔

#[allow(clippy::deprecated_cfg_attr)]
#[cfg_attr(rustfmt, rustfmt_skip)]
static KEYWORDS: Lazy<HashMap<&'static str, TokenType>> = Lazy::new(|| {
    HashMap::from([
        ("and",     TokenType::And),
        ("class",   TokenType::Class),
        ("else",    TokenType::Else),
        ("false",   TokenType::False),
        ("for",     TokenType::For),
        ("fun",     TokenType::Fun),
        ("if",      TokenType::If),
        ("nil",     TokenType::Nil),
        ("or",      TokenType::Or),
        ("print",   TokenType::Print),
        ("return",  TokenType::Return),
        ("super",   TokenType::Super),
        ("this",    TokenType::This),
        ("true",    TokenType::True),
        ("var",     TokenType::Var),
        ("while",   TokenType::While),
    ])
});

[Jarcho]

Tool attributes were stabilized in 1.30.

[MunchyYDL]

Thanks for the quick reply! 👍

So, I restarted VS Code, and that solved my issue with it not allowing #[rustfmt::skip] 🫣