return false;
      }

      @Override
      public boolean removeAll(Collection<?> collection) {
        return removeAllKeys(unfiltered, predicate, collection);
      }

      @Override
      public boolean retainAll(Collection<?> collection) {
        return retainAllKeys(unfiltered, predicate, collection);
      }

      @Override
      public @Nullable Object[] toArray() {

    Set<K> ks = keySet;
    return (ks != null) ? ks : (keySet = new KeySet());
  }

  @LazyInit @RetainedWith @CheckForNull Collection<V> values;

  @Override
  public Collection<V> values() {
    // does not impact recency ordering
    Collection<V> vs = values;
    return (vs != null) ? vs : (values = new Values());
  }

  @LazyInit @RetainedWith @CheckForNull Set<Entry<K, V>> entrySet;

import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.common.base.BenchmarkHelpers.SampleMatcherConfig;
import com.google.common.collect.Lists;
import java.util.BitSet;
import java.util.Collections;
import java.util.List;
import java.util.Random;

/**
 * Benchmark for the {@link CharMatcher} class.
 *
 * @author David Beaumont
 * @author Kevin Bourrillion
 * @author David Richter
 */

    TestFuture(ListenableFuture<String> future, String name, Runnable finisher) {
      this.future = future;
      this.name = name;
      this.finisher = finisher;
    }
  }

  /**
   * A collection of several futures, covering cancellation, success, and failure (both {@link
   * ExecutionException} and {@link RuntimeException}), both immediate and delayed. We use each

import com.google.caliper.Benchmark;
import com.google.caliper.Param;
import com.google.common.base.BenchmarkHelpers.SampleMatcherConfig;
import com.google.common.collect.Lists;
import java.util.BitSet;
import java.util.Collections;
import java.util.List;
import java.util.Random;

/**
 * Benchmark for the {@link CharMatcher} class.
 *
 * @author David Beaumont
 * @author Kevin Bourrillion
 * @author David Richter
 */

    TestFuture(ListenableFuture<String> future, String name, Runnable finisher) {
      this.future = future;
      this.name = name;
      this.finisher = finisher;
    }
  }

  /**
   * A collection of several futures, covering cancellation, success, and failure (both {@link
   * ExecutionException} and {@link RuntimeException}), both immediate and delayed. We use each

    Set<K> ks = keySet;
    return (ks != null) ? ks : (keySet = new KeySet());
  }

  @LazyInit @RetainedWith @CheckForNull Collection<V> values;

  @Override
  public Collection<V> values() {
    // does not impact recency ordering
    Collection<V> vs = values;
    return (vs != null) ? vs : (values = new Values());
  }

  @LazyInit @RetainedWith @CheckForNull Set<Entry<K, V>> entrySet;