virtual a {
    option aaa # bbb
           aa cc;
    param { # comment 1
        a b;
        c d;
        x y z; # comment 2
    }
    param e f g h; # comment 3
    param e f g hlskdjflskdfjsd #comment 4
     flksdjf sldkfjsldkfjsdlf
    "lsdkfjsldkfjlsdkjflskdjflsdkjfl" "lkjsdlfjsdlfkjsdlfj";
}