--- each_pair {|member, value| ... }    ruby 1.7 feature

    ¤ΤΥ̾(Symbol)ͤȤ˥֥å򷫤֤
    Ԥޤ

    self ֤ޤ

        Foo = Struct.new(:foo, :bar)
        Foo.new('FOO', 'BAR').each_pair {|m, v| p [m,v]}

        # => [:foo, "FOO"]
             [:bar, "BAR"]

