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: lzma.rb
    path of file: ./repos/brew/Library/Homebrew/unpack_strategy
    
    the code of the file until where you have to start completion: module UnpackStrategy
  class Lzma
    include UnpackStrategy

    using Magic

    def self.extensions
      [".lzma
    
    def extract_to_dir(unpack_dir, basename:, verbose:)
      FileUtils.cp path, unpack_dir/basename, preserve: true
      quiet_flags = verbose ? [] : ["-q"]
      system_command! "unlzma",
                      args:    [*quiet_flags, "--", unpack_dir/basename],
                      env:     { "PATH" => PATH.new(Formula["xz"].opt_bin, ENV["PATH"]) },
                      verbose: verbose
    end