# File lib/spring/commands/rake.rb, line 13
      def env(args)
        # This is an adaption of the matching that Rake itself does.
        # See: https://github.com/jimweirich/rake/blob/3754a7639b3f42c2347857a0878beb3523542aee/lib/rake/application.rb#L691-L692
        if env = args.grep(/^(RAILS|RACK)_ENV=(.*)$/m).last
          return env.split("=").last
        end

        self.class.environment_matchers.each do |matcher, environment|
          return environment if matcher === (args.first || :default)
        end

        nil
      end