You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: prepend_features_spec.rb
    path of file: ./repos/jruby/spec/ruby/core/module
    
    the code of the file until where you have to start completion: require_relative '../../spec_helper'
require_relati
    
      def foo; :foo; end
      def bar; super; end
    end

    mod = Module.new do
      def foo; :fooo; end
    end

    child.new.foo
    child.new.bar

    child.prepend(mod)

    child.new.bar.should == :bar
  end

  describe "on Class" do
    it "is undefined" do
      Class.should_not have_private_instance_method(:prepend_features, true)
    end

    it "raises a TypeError if calling after rebinded to Class" do
      -> {
        Module.instance_method(:prepend_features).bind(Class.new).call Module.new
      }.should raise_error(TypeError)
    end
  end
end