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: run.rb
    path of file: ./repos/hyperstack/ruby/hyper-operation/lib/hyper-operation/railway
    
    the code of the file until where you have to start completion: module Hyperstack
    
      def result
        @result ||= @promise_chain.always do |e|
          if %i[abort failed].include? @state
            if e.is_a? Exception
              raise e
            else
              raise Promise::Fail.new(e)
            end
          else
            e
          end