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: registry.rb
    path of file: ./repos/activeentity/lib/active_entity/type
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module ActiveEntity
  # :stopdoc:
  module Type
    class Registry # :nodoc:
      def initialize
    
    
      def lookup(symbol, *args, **kwargs)
        registration = find_registration(symbol, *args, **kwargs)

        if registration
          registration.call(self, symbol, *args, **kwargs)
        else
          raise ArgumentError, "Unknown type #{symbol.inspect}"
        end