@SuppressWarnings("unchecked")
  public static <T extends @Nullable Object> Collector<T, ?, T> onlyElement() {
    return (Collector) ONLY_ELEMENT;
  }

  /**
   * This atrocity is here to let us report several of the elements in the stream if there were more
   * than one, not just two.
   */
  private static final class ToOptionalState {
    static final int MAX_EXTRAS = 4;

    @CheckForNull Object element;
    List<Object> extras;

   * tasks would be called recursively. Here, we detect that the delegate executor is executing
   * inline, and maintain a queue to dispatch tasks iteratively. There is one instance of this class
   * per call to submit() or submitAsync(), and each instance supports only one call to execute().
   *
   * <p>This class would certainly be simpler and easier to reason about if it were built with

  private static final long K1 = 0x0f0e0d0c0b0a0908L;
  private static final HashFunction SIP_WITH_KEY = Hashing.sipHash24(K0, K1);
  private static final HashFunction SIP_WITHOUT_KEY = Hashing.sipHash24();

  // These constants were originally ported from https://www.131002.net/siphash/siphash24.c. See:
  // https://github.com/nahi/siphash-java-inline/blob/master/src/test/java/org/jruby/util/SipHashInlineTest.java
  private static final long[] EXPECTED =

   * behavior of futures so that you can contrast the next test with it.
   */
  public void testRegularFutureInterrupted() throws ExecutionException {

    /*
     * Here's the order of events that we want.
     *
     * 1. The client thread begins to block on a get() call to a future.
     * 2. The client thread is interrupted sometime before the result would be
     *   available.

 *     .withDefaultPort(80)
 *     .requireBracketsForIPv6();
 * hp.getHost();   // returns "2001:db8::1"
 * hp.getPort();   // returns 80
 * hp.toString();  // returns "[2001:db8::1]:80"
 * </pre>
 *
 * <p>Here are some examples of recognized formats:
 *
 * <ul>
 *   <li>example.com
 *   <li>example.com:80
 *   <li>192.0.2.1
 *   <li>192.0.2.1:80
 *   <li>[2001:db8::1] - {@link #getHost()} omits brackets

      Stopwatch s = Stopwatch.createStarted();
      // here is where you would do something
      total += s.elapsed(TimeUnit.NANOSECONDS);
    }
    return total;
  }

  @Benchmark
  long manual(int reps) {
    long total = 0;
    for (int i = 0; i < reps; i++) {
      long start = System.nanoTime();
      // here is where you would do something
      total += (System.nanoTime() - start);
    }

      Stopwatch s = Stopwatch.createStarted();
      // here is where you would do something
      total += s.elapsed(TimeUnit.NANOSECONDS);
    }
    return total;
  }

  @Benchmark
  long manual(int reps) {
    long total = 0;
    for (int i = 0; i < reps; i++) {
      long start = System.nanoTime();
      // here is where you would do something
      total += (System.nanoTime() - start);
    }

import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A notification of the removal of a single entry. The key and/or value may be null if they were
 * already garbage collected.
 *
 * <p>Like other {@code Entry} instances associated with {@code CacheBuilder}, this class holds
 * strong references to the key and value, regardless of the type of references the cache may be

    assertEquals("../..", simplifyPath("./.././../"));
  }

  /*
   * We co-opt some URI resolution tests for our purposes.
   * Some of the tests have queries and anchors that are a little silly here.
   */

  /** http://gbiv.com/protocols/uri/rfc/rfc2396.html#rfc.section.C.1 */
  public void testRfc2396Normal() {
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/g"));

    assertEquals("../..", simplifyPath("./.././../"));
  }

  /*
   * We co-opt some URI resolution tests for our purposes.
   * Some of the tests have queries and anchors that are a little silly here.
   */

  /** http://gbiv.com/protocols/uri/rfc/rfc2396.html#rfc.section.C.1 */
  public void testRfc2396Normal() {
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/g"));