fails to call superclass of wrapped method

[jabamaus]

module Wrapper
  def wrap(meth)
    define_method(meth) do |*args, **kwargs, &block|
      super(*args, **kwargs, &block)
      puts "side effect"
      self
    end
  end
end

class MyString < String
  extend Wrapper
  wrap :<<
end


MyString.new << "a"

This code prints 'side effect' in cruby but with mruby I get

test.rb:4:in <<: no superclass method 'wrap' (NoMethodError)

What's going on here? This is with latest mruby head.

Thanks :)

[matz]

It is a bug. But it may take time to fix the issue. Stay tuned, please.

[jabamaus]

No problem. I think the problem got introduced in the past few months as I'm sure I've seen this working.