Works in Ruby 1.9.3 and 2.0.0, but not Ruby 2.1 or 2.2

method_missing_with_delgator.rb

require 'delegate'

class Foo < SimpleDelegator
  def bar
    raise "Bar"
  end

  def method_missing(name, *args)
    puts name
  end
end

class Baz
end

Foo.new(Baz.new).bar

output.txt

$ chruby system
$ ruby -v                   
ruby 2.0.0p481 (2014-05-08 revision 45883) [universal.x86_64-darwin14]
$ ruby method_missing_test.rb
method_missing_test.rb:5:in `bar': Bar (RuntimeError)
	from method_missing_test.rb:16:in `<main>'
$ chruby 2.1  
$ ruby method_missing_test.rb     
method_missing_test.rb:9: stack level too deep (SystemStackError)
$ chruby 2.2
$ ruby method_missing_test.rb   
method_missing_test.rb:9:in `method_missing': stack level too deep (SystemStackError)
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	 ... 8723 levels...
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:9:in `method_missing'
	from method_missing_test.rb:5:in `bar'
	from method_missing_test.rb:16:in `<main>'