--- print([arg1[, arg2, ...]])

    ˽ϤޤͿʤˤѿ
    $_ ͤϤޤ
    ʸʳΥ֥ȤȤͿ줿ˤϡ
    ֥Ȥ to_s ᥽åɤˤʸѴ
    ƤϤޤ
    nil ФƤʸ "nil" Ϥޤ

    ѿ $; (ϥեɥѥ졼) nil 
    ʤͤåȤƤˤϡưδ֤ˤʸϤޤ
    ѿ $\ (ϥ쥳ɥѥ졼) nil Ǥ
    ͤåȤƤˤϡǸˤϤޤ

    nil ֤ޤ

