--- write(str)

    IOݡȤФ str Ϥޤstr ʸǤʤ
     to_s ˤʸ󲽤ߤޤ

    IO#syswrite [IO/syswrite] Ƥνϥ᥽åɤϡǽŪ 
    "write" Ȥ̾Υ᥽åɤƤӽФΤǡΥ᥽åɤ֤
    Ȥǽϴؿεưѹ뤳ȤǤޤ
    

    ºݤ˽ϤǤХȿ֤ޤϤ˼Ԥ㳰 
    Errno::EXXX ȯޤ

