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: to_ruby.rb
    path of file: ./repos/rubygems/lib/rubygems/safe_marshal/visitors
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "visitor"

module Gem::SafeMarshal
  module Visitors
    class ToRuby < Visitor
      def initialize(permitted_classes:, permitted_symbols:, permitted
    
      def visit_Gem_SafeMarshal_Elements_UserClass(r)
        if resolve_class(r.name) == ::Hash && r.wrapped_object.is_a?(Elements::Hash)

          hash = register_object({}.compare_by_identity)

          o = r.wrapped_object
          o.pairs.each_with_index do |(k, v), i|
            push_stack i
            k = visit(k)
            push_stack k
            hash[k] = visit(v)
          end

          if o.is_a?(Elements::HashWithDefaultValue)
            push_stack :default
            hash.default = visit(o.default)
          end