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: pass2.rb
    path of file: ./repos/natalie/lib/natalie/compiler
    
    the code of the file until where you have to start completion: require_relative './base_pass'
require_relative './env_builder'

module Natalie
  class Compiler
    # This compiler pass marks VariableGet and VariabletSet instructions as
    # captured if they are used in a block (closure).
    # You can debug this pass with the `-d p2` CLI flag.
    class Pass2 < BasePass
      def initialize(instructions, compiler_context:)
        super()
    
      def find_or_create_var(env, name, local_only: false, setting_to_itself: false)
        raise "bad var name: #{name.inspect}" unless name =~ /^(?:[[:alpha:]]|_)[[:alnum:]]*/

        owning_env = env

        # "hoisted" envs don't ever own a variable
        while owning_env[:hoist]
          hoisted_out_of_env = owning_env
          owning_env = owning_env.fetch(:outer)
        end

        env = owning_env

        # Two easy cases where the variable gets marked as "captured":
        #
        # 1. We're in the REPL
        # 2. We're setting the variable to itself
        capturing = repl? || setting_to_itself

        # And one complicated case where it gets marked:
        #
        # 3. The variable is referenced from a block
        loop do
          if env.fetch(:vars).key?(name)
            var = env.dig(:vars, name)
            var[:captured] = true if capturing
            return var
          end

          if env[:block] && !local_only && (outer = env.fetch(:outer))
            env = outer
            capturing = true
            env = env.fetch(:outer) while env[:hoist]
          else
            break
          end