BinaryOperator<V> mergeFunction) {
    return CollectCollectors.toImmutableSortedMap(
        comparator, keyFunction, valueFunction, mergeFunction);
  }

  /*
   * TODO(kevinb): Confirm that ImmutableSortedMap is faster to construct and
   * uses less memory than TreeMap; then say so in the class Javadoc.
   */
  private static final Comparator<?> NATURAL_ORDER = Ordering.natural();

                   animal-sniffer. And that would be fine for our -jre builds:
                   If we're building with JDK8, then clearly we're sticking to
                   JDK8 APIs. However, I assume (but did not confirm) that we'd
                   have the same issue with our -android builds, which need
                   animal-sniffer so that they can check that we're sticking to
                   JDK6-like APIs.

   */
  @J2ktIncompatible
  @GwtIncompatible // concurrency
  static Thread newThread(String name, Runnable runnable) {
    checkNotNull(name);
    checkNotNull(runnable);
    // TODO(b/139726489): Confirm that null is impossible here.
    Thread result = requireNonNull(platformThreadFactory().newThread(runnable));
    try {
      result.setName(name);
    } catch (SecurityException e) {

            <!-- Even after we stop using JSR305 annotations in our own code, we'll want this link so that NullPointerTester's docs can link to @CheckForNull and friends... at least once we start using this config for guava-testlib. -->
            <offlineLink>
              <url>https://static.javadoc.io/com.google.code.findbugs/jsr305/3.0.1/</url>
              <location>${project.basedir}/javadoc-link/jsr305</location>