Thread w = thread;
      if (w != null) {
        thread = null;
        LockSupport.unpark(w);
      }
    }
  }

  /**
   * Marks the given node as 'deleted' (null waiter) and then scans the list to unlink all deleted
   * nodes. This is an O(n) operation in the common case (and O(n^2) in the worst), but we are saved
   * by two things.
   *
   * <ul>

          public String toString() {
            return fallback.toString();
          }
        };
    return derive(future.catchingAsync(exceptionType, asyncFunction, executor));
  }

  /**
   * Marks this step as the last step in the {@code ClosingFuture} pipeline.
   *
   * <p>The returned {@link Future} is completed when the pipeline's computation completes, or when
   * the pipeline is cancelled.
   *

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