}

  @GwtIncompatible // NavigableMap
  static <K extends @Nullable Object, V extends @Nullable Object> NavigableMap<K, V> navigableMap(
      NavigableMap<K, V> navigableMap) {
    return navigableMap(navigableMap, null);
  }

  @GwtIncompatible // NavigableMap
  static <K extends @Nullable Object, V extends @Nullable Object> NavigableMap<K, V> navigableMap(

  }

  @GwtIncompatible // NavigableMap
  static <K extends @Nullable Object, V extends @Nullable Object> NavigableMap<K, V> navigableMap(
      NavigableMap<K, V> navigableMap) {
    return navigableMap(navigableMap, null);
  }

  @GwtIncompatible // NavigableMap
  static <K extends @Nullable Object, V extends @Nullable Object> NavigableMap<K, V> navigableMap(

 *
 * @author Jared Levy
 * @author Louis Wasserman
 * @since 2.0 (implements {@code NavigableMap} since 12.0)
 */
@GwtCompatible(serializable = true, emulated = true)
@ElementTypesAreNonnullByDefault
public final class ImmutableSortedMap<K, V> extends ImmutableMap<K, V>
    implements NavigableMap<K, V> {
  /**
   * Returns a {@link Collector} that accumulates elements into an {@code ImmutableSortedMap} whose

import java.util.Map;
import java.util.NavigableMap;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.stream.Collector;
import java.util.stream.Collectors;
import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**