* it is returned directly. Otherwise, a new array of size {@code minLength + padding} is
   * returned, containing the values of {@code array}, and zeroes in the remaining places.
   *
   * @param array the source array
   * @param minLength the minimum length the returned array must guarantee
   * @param padding an extra amount to "grow" the array by if growth is necessary

    Object unused9 = new Object() {};
    Object o10 = new Object() {};
    String toTest = MoreObjects.toStringHelper(o10).toString();
    assertTrue(toTest, toTest.matches(".*\\{\\}"));
  }

  // all remaining test are on an inner class with various fields
  @GwtIncompatible // Class names are obfuscated in GWT
  public void testToString_oneField() {

      @Nullable ImmutableCollection<? extends Future<? extends InputT>>
          futuresIfNeedToCollectAtCompletion) {
    int newRemaining = decrementRemainingAndGet();
    checkState(newRemaining >= 0, "Less than 0 remaining futures");
    if (newRemaining == 0) {
      processCompleted(futuresIfNeedToCollectAtCompletion);
    }
  }

  private void processCompleted(

    ): Int {
      var result = length
      if (flags and FLAG_PADDED != 0) result-- // Account for reading the padding length.
      if (padding > result) {
        throw IOException("PROTOCOL_ERROR padding $padding > remaining length $result")
      }
      result -= padding
      return result
    }
  }

  }

  private static final class UnknownElementException extends RuntimeException {
    private UnknownElementException(Collection<?> expected, Object actual) {
      super("Returned value '" + actual + "' not found. Remaining elements: " + expected);
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  /**

// and always returns nil.
func (r *RingBuffer) CloseWithError(err error) {
	if err == nil {
		err = io.EOF
	}
	r.setErr(err, false)
}

// CloseWriter closes the writer.
// Reads will return any remaining bytes and io.EOF.
func (r *RingBuffer) CloseWriter() {
	r.setErr(io.EOF, false)
}

// Flush waits for the buffer to be empty and fully read.

   * it is returned directly. Otherwise, a new array of size {@code minLength + padding} is
   * returned, containing the values of {@code array}, and zeroes in the remaining places.
   *
   * @param array the source array
   * @param minLength the minimum length the returned array must guarantee
   * @param padding an extra amount to "grow" the array by if growth is necessary

   * it is returned directly. Otherwise, a new array of size {@code minLength + padding} is
   * returned, containing the values of {@code array}, and zeroes in the remaining places.
   *
   * @param array the source array
   * @param minLength the minimum length the returned array must guarantee
   * @param padding an extra amount to "grow" the array by if growth is necessary

   * it is returned directly. Otherwise, a new array of size {@code minLength + padding} is
   * returned, containing the values of {@code array}, and zeroes in the remaining places.
   *
   * @param array the source array
   * @param minLength the minimum length the returned array must guarantee
   * @param padding an extra amount to "grow" the array by if growth is necessary

          continue restart; // We raced with an add or complete
        }
        curr = succ;
      }
      break;
    }
  }

  // A heuristic for timed gets. If the remaining timeout is less than this, spin instead of
  // blocking. This value is what AbstractQueuedSynchronizer uses.
  private static final long SPIN_THRESHOLD_NANOS = 1000L;

  @VisibleForTesting