message: Fix broken debug output
diff: @@ -547,10 +547,7 @@ impl CAST {
  }
  };
  if comment.is_some() {
  - format!("{}//{}\n{}",
  - format_with_indent("", indent),
  - &comment.unwrap(),
  - result)
  + format!("{}\t//{}", result, &comment.unwrap())
  } else {
  result
  }
  