android/guava/src/com/google/common/collect/ImmutableSortedSetFauxverideShim.java
@Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2) {
    throw new UnsupportedOperationException();
  }
@Deprecated
  public static <E> ImmutableSortedSet<E> of(E e1, E e2) {
    throw new UnsupportedOperationException();
  }
Not supported. <b>You are attempting to create a set that may contain a non-{@code Comparable}
element.</b> Proper calls will resolve to the version in {@code ImmutableSortedSet}, not this
dummy version.

@throws UnsupportedOperationException always
@deprecated <b>Pass the parameters of type {@code Comparable} to use {@link
ImmutableSortedSet#of(Comparable, Comparable)}.</b>