rustfmt can delete comments within an attribute

[ahl]

source:

#[derive(A,
    B,
    C,
    D,
    // E,
)]
fn foo() {
    bar(1,
        2,
        3,
        4,
        // 5,
    );
}

post-rustfmt:

#[derive(A, B, C, D)]
fn foo() {
    bar(
        1, 2, 3, 4,
        // 5,
    );
}

I would expect something like:

#[derive(
    A, B, C, D,
    // E,
)]
fn foo() {
    bar(
        1, 2, 3, 4,
        // 5,
    );
}

I'd be happy to submit a PR for this.

[calebcartwright]

I'd be happy to submit a PR for this.

Awesome, thank you! Don't feel obligated to look into this by any means, but there's another issue with derives where they get dropped when malformed (#4029/#3898), and the respective fixes would likely touch a lot of the same code.

[ahl]

@calebcartwright ok, I fixed all three.

[calebcartwright]

Awesome! Thank you so much @ahl 🎉