Method setException

future-java/src/main/java/io/trane/future/Promise.java:354–356

Completes this promise with a failure ex. @param ex the failure.

(final Throwable ex)

   * @param ex  the failure.
   */
  public final void setException(final Throwable ex) {
    become(new ExceptionFuture<>(ex));
  }

  /**
   * Raises an interrupt.