Code formatting is broken by let_chains in VSCode

[Drestin]

When using the nightly feature let_chains, any file that contains a let chain can no longer be formatted.

Minimal example:

#![feature(let_chains)]

fn main() {
    let a = Some(true);
    if let Some(b) = a && b
    {
        println!("Hello, world!");
    }
}

• The syntax highlighting or the quick fixes still work.
• If I comment && b, the formatting works.
• Also happens with while let &&

I am using:

• latest version of the rust-analyzer extension (0.3.1443).
• Linux (Manjaro)
• Rust nightly-2023-03-18
• VSCodium 1.75.1

I couldn't find an existing issue on this, which strikes me as strange since it is a very easy to run into it, for a somewhat popular nightly feature. Sorry if this is a duplicate.

Also, I filed it as a bug (since it breaks the formatting of the whole file), but it could very well be a missing feature depending how you look at it.

[lnicola]

We use rustfmt for formatting, which doesn't support that feature: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=b1cd259263bf700e27e185d471fc479c, rust-lang/rustfmt#5203.

[Drestin]

Oh OK sorry, I didn't look into the right tool.
Thank you