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: data_dig_function_provider.rb
    path of file: ./repos/puppet/lib/puppet/pops/lookup
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative 'function_provider'

module Puppet::Pops
module Lookup
# @api private
class DataDigFunctionProvider < FunctionProvider
  TAG = 'data_dig'

  # Performs a
    
  def instantiate_backend(lookup_invocation)
    backend_name = options[HieraConfig::KEY_BACKEND]
    begin
      require 'hiera/backend'
      require "hiera/backend/#{backend_name.downcase}_backend"
      backend = Hiera::Backend.const_get("#{backend_name.capitalize}_backend").new
      backend.method(:lookup).arity == 4 ? Hiera::Backend::Backend1xWrapper.new(backend) : backend
    rescue LoadError => e
      lookup_invocation.report_text { "Unable to load backend '#{backend_name}': #{e.message}" }
      throw :no_such_key
    rescue NameError => e
      lookup_invocation.report_text { "Unable to instantiate backend '#{backend_name}': #{e.message}" }
      throw :no_such_key
    end