// obj changed, reread
        localValue = abstractFuture.value;
        if (!(localValue instanceof SetFuture)) {
          // obj cannot be null at this point, because value can only change from null to non-null.
          // So if value changed (and it did since we lost the CAS), then it cannot be null and
          // since it isn't a SetFuture, then the future must be done and we should exit the loop
          break;
        }

      }
    }
    return builder.append("]").toString();
  }

  /**
   * Provide a human-readable explanation of why this future has not yet completed.
   *
   * @return null if an explanation cannot be provided because the future is done.
   */
  @Nullable
  String pendingToString() {
    if (state == State.DELEGATED) {
      return "setFuture=[" + delegate + "]";
    }
    return null;
  }