src/tools/rustfmt/tests/source/issue_4037.rs

fn f() {
    let x = 0;
    match x {
        0 => {}


        1 => {}
        _ => {}


        // foo
        // bar,
    }
}

fn wont_fmt() -> [(); 1] {
    [
        ()
        
        
        //
        // ,
    ]
}