JRuby dci branch bug repro

enumerable_pipe.rb

class EnumerablePipe
  def initialize(obj)
    obj.to_enum
  end
end

repro.rb

class IdenticalCopy
  def initialize(obj)
    obj.to_enum
  end
end

require 'enumerable_pipe'

puts 'start'

IdenticalCopy.new [1, 2, 3]
puts 'it works here'

EnumerablePipe.new [1, 2, 3]
puts 'but not here'