Commented out `macro_rules` arm gets moved after previous arm

macro_rules! val {
    ($name:ident) => {
        stringify!($name)
    };
    // ($name:ident $value:literal) => {
    //     $value
    // };
}

gets formatted as

macro_rules! val {
    ($name:ident) => {
        stringify!($name)
    }; // ($name:ident $value:literal) => {
       //     $value
       // };
}

If wrap_comments = true is enabled it gets turned into a block comment which was quite a surprise

macro_rules! val {
    ($name:ident) => {
        stringify!($name)
    }; /* ($name:ident $value:literal) => {
        *     $value
        * }; */
}

Start by reproducing the formatting change from the issue, with and without wrap_comments enabled, then trace the macro_rules comment-handling path. Add a regression test covering the commented-out arm and verify that formatting preserves its position and comment style.