class Cool
    @var

    def test
        @var = "test"
        puts @var.inspect
    end
end

class Ok
    def initialize
        Cool::test
    end
end

obj = Ok.new


# --- output

#test.rb:12:in `initialize': private method `test' called for Cool:Class (NoMethodError)
#	from test.rb:16:in `new'
#	from test.rb:16:in `<main>'