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: opt.rb
    path of file: ./repos/truffleruby/bench/optcarrot/lib/optcarrot
    
    the code of the file until where you have to start completion: module Optcarrot
  # dirty methods manipulating and generating methods...
  module CodeOptimizationHelper
    def initialize(loglev
    
    def localize_instance_variables(code, ivars = code.scan(/@\w+/).uniq.sort)
      ivars = ivars.map {|ivar| ivar.to_s[1..-1] }

      inits, finals = [], []
      ivars.each do |ivar|
        lvar = "__#{ ivar }__"
        inits << "#{ lvar } = @#{ ivar }"
        finals << "@#{ ivar } = #{ lvar }"
      end

      code = code.gsub(/@(#{ ivars * "|" })\b/) { "__#{ $1 }__" }

      gen(
        "begin",
        indent(2, inits.join("\n")),
        indent(2, code),
        "ensure",
        indent(2, finals.join("\n")),
        "end",
      )
    end