[Truffle] Private method error

[bjfish]

I am getting the following error with this sample code below. I apologize if this is something we haven't implemented yet. I was not sure.

Code:

module Example

  class << Example

    private

    def append_features(mod)
      puts "Hello"
      super
    end

  end

end

class Example2
  include Example
end 

puts "Done"

Error:

rang.rb:17:in `include': private method `append_features' called for org.jruby.truffle.runtime.core.RubyClass@19d6ba35(Module) (NoMethodError)
    from rang.rb:17:in `Example2'
    from rang.rb:16:in `<main>'

Expected output (jruby, ruby):

Hello
Done

[bjfish]

@chrisseaton this error was from rubysl-singleton , so that library might work now

[bjfish]

Oops,I just remembered there is undef_method there too which i comented out.

[chrisseaton]

There seem to be quite a few issues preventing singleton from working at the moment - no specs passed straight away.