ImmutableMap.of(
            new IntegerDiv10(3), "three",
            new IntegerDiv10(20), "twenty",
            new IntegerDiv10(11), "eleven",
            new IntegerDiv10(35), "thirty five",
            new IntegerDiv10(12), "twelve");

    try {
      ImmutableSortedMap.copyOf(original);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
    }

  // Fields

  /**
   * Mask value for indexing into segments. The upper bits of a key's hash code are used to choose
   * the segment.
   */
  final transient int segmentMask;

  /**
   * Shift value for indexing within segments. Helps prevent entries that end up in the same segment
   * from also ending up in the same bucket.
   */
  final transient int segmentShift;

        ImmutableMap.of(
            new IntegerDiv10(3), "three",
            new IntegerDiv10(20), "twenty",
            new IntegerDiv10(11), "eleven",
            new IntegerDiv10(35), "thirty five",
            new IntegerDiv10(12), "twelve");

    try {
      ImmutableSortedMap.copyOf(original);
      fail("Expected IllegalArgumentException");
    } catch (IllegalArgumentException expected) {
    }