HERE.'

  `But then,' thought Alice, `shall I NEVER get any older than I
am now?  That'll be a comfort, one way--never to be an old woman--
but then--always to have lessons to learn!  Oh, I shouldn't like THAT!'

  `Oh, you foolish Alice!' she answered herself.  `How can you
learn lessons in here?  Why, there's hardly room for YOU, and no
room at all for any lesson-books!'

HERE.'

  `But then,' thought Alice, `shall I NEVER get any older than I
am now?  That'll be a comfort, one way--never to be an old woman--
but then--always to have lessons to learn!  Oh, I shouldn't like THAT!'

  `Oh, you foolish Alice!' she answered herself.  `How can you
learn lessons in here?  Why, there's hardly room for YOU, and no
room at all for any lesson-books!'

   */
  public static <C extends @Nullable Object, K extends C, V extends @Nullable Object>
      TreeMap<K, V> newTreeMap(@CheckForNull Comparator<C> comparator) {
    // Ideally, the extra type parameter "C" shouldn't be necessary. It is a
    // work-around of a compiler type inference quirk that prevents the
    // following code from being compiled:
    // Comparator<Class<?>> comparator = null;