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: root.rb
    path of file: ./repos/vagrant/lib/vagrant/config/v2
    
    the code of the file until where you have to start completion: # Copyright (c) HashiCorp, Inc.
# SPDX-License-Identifier: BUSL-1.1

require "set"

require "vagrant/config/v2/util"

module Vagrant
  module Config
    module V2
      # This is the root configuration class. An instance of this is what
      # is passed into version 2 Vagrant configuration blocks.
      class Root
        # Initializes a root object that maps the given keys to spec
    
        def validate(machine, ignore_provider=nil)
          # Go through each of the configuration keys and validate
          errors = {}
          @keys.each do |_key, instance|
            if instance.respond_to?(:validate)
              # Validate this single item, and if we have errors then
              # we merge them into our total errors list.
              if _key == :vm
                result = instance.validate(machine, ignore_provider)
              else
                result = instance.validate(machine)
              end
              if result && !result.empty?
                errors = Util.merge_errors(errors, result)
              end