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: state_machine_store.rb
    path of file: ./repos/aasm/lib/aasm
    
    the code of the file until where you have to start completion: require 'concu
    
    def clone
      StateMachineStore.new.tap do |store|
        @machines.each_pair do |name, machine|
          store.register(name, machine.clone)
        end
      end
    end