}
        }

        @Override
        public void close() {
            this.executor.close();
        }

        /**
         * Processes a single build step, deciding whether to schedule it for execution or skip it.
         *
         * @param step The build step to process
         */
        private void processStep(BuildStep step) {

          },
          directExecutor());
    } else {
      switch (state.get()) {
        case SUBSUMED:
          throw new IllegalStateException(
              "Cannot call finishToFuture() after deriving another step");

        case WILL_CREATE_VALUE_AND_CLOSER:
          throw new IllegalStateException(
              "Cannot call finishToFuture() after calling finishToValueAndCloser()");