Match branch with comma and comment not formatted

[aDotInTheVoid]

fn execute_instruction(instruction: Instruction) {
    match instruction {
                 RotateAccRight => {}
,
            // RLA
            RotateAccLeftThroughCarry => {}
    }
}

Rustfmt doesnt format this: playground

Interestinly: if you remove the , or // RLA, it does format the code

[gardrek]

To add to this, it seems it's not just the single branch, but the whole match statement that doesn't get formatted.

[calebcartwright]

Believe this is likely a dupe of #4119 but will leave open for now