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: zones.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/activesupport-5.0.3/lib/active_support/core_ext/time
    
    the code of the file until where you have to start completion: require 'active_support/time
    
    def use_zone(time_zone)
      new_zone = find_zone!(time_zone)
      begin
        old_zone, ::Time.zone = ::Time.zone, new_zone
        yield
      ensure
        ::Time.zone = old_zone
      end