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: psych.rb
    path of file: ./repos/ruby-packer/ruby/ext/psych/lib
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'psych/versions'
case RUBY_ENGINE
when 'jruby
    
  def self.dump_stream *objects
    visitor = Psych::Visitors::YAMLTree.create({})
    objects.each do |o|
      visitor << o
    end
    visitor.tree.yaml
  end