--- remove_class_variable(name)

    name ǻꤷ饹ѿΥ饹ѿꤵ
    Ƥ֤ͤޤ⤷ꤷ饹ѿΥ⥸塼(ޤ
    ϥ饹)Ƥʤ㳰 NameError ȯޤ

      class Foo
        @@foo = 1
        remove_class_variable(:@@foo)   # => 1
        p @@foo   # => uninitialized class variable @@foo in Foo (NameError)
      end

    Module#remove_const [Module/remove_const],
    Object#remove_instance_variable [Object/remove_instance_variable]
    ⻲ȤƤ

