--- reverse
--- reverse!

    reverse ƤǤս¤٤֤ޤ
    reverse! Ǥս(˲Ū)¤ؤޤ

    reverse ϡ˿֤ޤreverse!  ϡ
    1 ǤФ nil ֤ʳǤ self 
    ޤ

