* reflected in that iterator. These iterators never throw {@link ConcurrentModificationException}.
 *
 * <p><b>Note:</b> by default, the returned cache uses equality comparisons (the {@link
 * Object#equals equals} method) to determine equality for keys or values. However, if {@link
 * #weakKeys} was specified, the cache uses identity ({@code ==}) comparisons instead for keys.

 * that makes `java.net.URL` unusable for many things. It shouldn't be used as a [Map] key or in a
 * [Set]. Doing so is both inefficient because equality may require a DNS lookup, and incorrect
 * because unequal URLs may be equal because of how they are hosted.
 *
 * ### Equal URLs should be equal
 *

_2016-02-06_

 *  New: WebSockets now defer some writes. This should improve performance for
    some applications.
 *  New: Override `equals()` and `hashCode()` in our new cookie class. This
    class now defines equality by value rather than by reference.
 *  New: Handle 408 responses by retrying the request. This allows servers to
    direct clients to retry rather than failing permanently.

      Comparator<? super E> comparator) {
    return new TreeSet<>(checkNotNull(comparator));
  }

  /**
   * Creates an empty {@code Set} that uses identity to determine equality. It compares object
   * references, instead of calling {@code equals}, to determine whether a provided object matches
   * an element in the set. For example, {@code contains} returns {@code false} when passed an

    TypeToken<StringForFirstTypeArg<Integer>> subtype =
        new TypeToken<StringForFirstTypeArg<Integer>>() {};
    assertTrue(subtype.isSubtypeOf(supertype));

    // TODO(benyu): This should check equality to an expected value, see discussion in cl/98674873
    TypeToken<?> unused = supertype.getSubtype(subtype.getRawType());
  }

  public void testGetSubtype_baseClassWithNoTypeArgs() {

    TypeToken<StringForFirstTypeArg<Integer>> subtype =
        new TypeToken<StringForFirstTypeArg<Integer>>() {};
    assertTrue(subtype.isSubtypeOf(supertype));

    // TODO(benyu): This should check equality to an expected value, see discussion in cl/98674873
    TypeToken<?> unused = supertype.getSubtype(subtype.getRawType());
  }

  public void testGetSubtype_baseClassWithNoTypeArgs() {