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: xstr.rb
    path of file: ./repos/unparser/lib/unparser/emitter
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Unparser
  class Emitter
    # Dynamic execute string literal emitter
    class XStr < self


    
      def emit_xstr
        write('`')
        children.each do |child|
          if n_begin?(child)
            emit_begin(child)
          else
            emit_string(child)
          end
        end