Does result contain any rewritten attributes? Would the #[allow(unused)] prevent rustfmt from writing this on a single line?

fn main() {
    #[allow(unused)]
    if true {
        println!("case 1");
    }

    #[allow(unused)]
    // What about if there's a comment here?
    if true {
        println!("case 2 with comment");
    }
}

We also don't want to allow single lining if the block contains a comment. I think the block rewriting handles that but just a call out that we'd need a test for it.

result here is the condition string, so it's saying if we haven't gone to a new line due to the condition, proceed with checking if we can go for 1 line with the block. So yes, it contains rewritten attributes if I understand you correctly.

I ask because I overlooked this case when adding single_line_let_else_max_width and then we needed #5902 to correct the issue. I want to make sure that we handle this up front. It would be unfortunate if leading attributes or comments prevented the guard clause from being reformatted.