if (webSocket == null) return;

    WebSocket webSocket;
    synchronized (this) {
      webSocket = this.webSocket;
    }

    if (webSocket != null) {
      webSocket.close(1000, "bye");
    }
  }

    } catch (NullPointerException e) {
    }
    try {
      result.next();
      fail("no exception thrown");
    } catch (NullPointerException e) {
    }
    // There is no way to get "through" to the 3.  Buh-bye
  }

  public void testConcatVarArgsContainingNull() {
    try {
      Iterators.concat(iterateOver(1, 2), null, iterateOver(3), iterateOver(4), iterateOver(5));
      fail("no exception thrown");

    } catch (NullPointerException e) {
    }
    try {
      result.next();
      fail("no exception thrown");
    } catch (NullPointerException e) {
    }
    // There is no way to get "through" to the 3.  Buh-bye
  }

  public void testConcatVarArgsContainingNull() {
    try {
      Iterators.concat(iterateOver(1, 2), null, iterateOver(3), iterateOver(4), iterateOver(5));
      fail("no exception thrown");