--- reopen(io)
--- reopen(name[, mode])

    Ȥ io ˷Ҥޤ饹 io ʤޤ
    ()

    ʸλname ǻꤵ줿ե˥ȥ꡼
    Ҥޤ

    Υǥեͤ "r" Ǥ
    ruby 1.8 feature: άȤ self Υ⡼
    򤽤ΤޤްѤޤ

    self ֤ޤ

