*/
  // TODO(kevinb): copy to Comparators, etc.
  @J2ktIncompatible // MapMaker
  public static Ordering<@Nullable Object> arbitrary() {
    return ArbitraryOrderingHolder.ARBITRARY_ORDERING;
  }

  @J2ktIncompatible // MapMaker
  private static final class ArbitraryOrderingHolder {
    static final Ordering<@Nullable Object> ARBITRARY_ORDERING = new ArbitraryOrdering();
  }

  @J2ktIncompatible // MapMaker

    // The same element is not allowed in both forgetMeNot and skipMe, but duplicates are allowed in
    // either of them, up to the same multiplicity as the queue.
    private @Nullable Queue<E> forgetMeNot;
    private @Nullable List<E> skipMe;
    private @Nullable E lastFromForgetMeNot;
    private boolean canRemove;

    @Override
    public boolean hasNext() {
      checkModCount();
      nextNotInSkipMe(cursor + 1);

  }

  public void testCopyOf_nullArray() {
    assertThrows(NullPointerException.class, () -> copyOf((String[]) null));
  }

  public void testCopyOf_arrayContainingOnlyNull() {
    @Nullable String[] array = new @Nullable String[] {null};
    assertThrows(NullPointerException.class, () -> copyOf((String[]) array));
  }

  public void testCopyOf_collection_empty() {
    Collection<String> c = MinimalCollection.of();

      @Override
      protected char @Nullable [] escape(char c) {
        return replacementMap.get(c);
      }
    };
  }

  // A trivial non-optimized escaper for testing.
  static UnicodeEscaper createSimpleUnicodeEscaper(ImmutableMap<Integer, char[]> replacementMap) {
    return new UnicodeEscaper() {
      @Override
      protected char @Nullable [] escape(int cp) {
        return replacementMap.get(cp);

import java.util.Iterator;
import java.util.NoSuchElementException;
import junit.framework.AssertionFailedError;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/** Tests for {@link AbstractSequentialIterator}. */
@GwtCompatible
@NullMarked
public class AbstractSequentialIteratorTest extends TestCase {
  @GwtIncompatible // Too slow
  public void testDoublerExhaustive() {

import java.util.Optional;

import org.apache.maven.api.annotations.Consumer;
import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;
import org.apache.maven.api.di.Named;
import org.apache.maven.api.model.Model;
import org.apache.maven.api.services.Source;

/**

    public CustomScheduler() {}

    /** A callable class that can reschedule itself using a {@link CustomScheduler}. */
    private final class ReschedulableCallable implements Callable<@Nullable Void> {

      /** The underlying task. */
      private final Runnable wrappedRunnable;

      /** The executor on which this Callable will be scheduled. */
      private final ScheduledExecutorService executor;

  private final StatsCounter statsCounter;
  private final @Nullable RemovalListener<? super K, ? super V> removalListener;
  private final long maximumSize;

  CapacityEnforcingMap(
      int initialCapacity,
      float loadFactor,
      boolean accessOrder,
      long maximumSize,
      StatsCounter statsCounter,
      @Nullable RemovalListener<? super K, ? super V> removalListener) {

       * @param t the exception to set as the result of the computation.
       * @param finalState the state to transition to.
       */
      private boolean complete(@Nullable V v, @Nullable Throwable t, int finalState) {
        boolean doCompletion = compareAndSetState(RUNNING, COMPLETING);
        if (doCompletion) {
          // If this thread successfully transitioned to COMPLETING, set the value

      }
    }

    /** Builds a new open-addressed hash table from the first n objects in elements. */
    static @Nullable Object[] rebuildHashTable(int newTableSize, Object[] elements, int n) {
      @Nullable Object[] hashTable = new @Nullable Object[newTableSize];
      int mask = hashTable.length - 1;
      for (int i = 0; i < n; i++) {