2018-fumichan-thesis / sinatra-practice / form-sample / vendor / bundle / ruby / 2.5.0 / gems / backports-3.11.4 / lib / backports / 1.8.7 / enumerator / rewind.rb

unless Object.const_defined? :Enumerator
  require 'enumerator'
  unless Enumerable::Enumerator.method_defined? :rewind
    class Enumerable::Enumerator
      def rewind
        require 'generator'
        @generator ||= ::Generator.new(self)
        @generator.rewind
        self
      end
    end
  end
end