import static com.google.common.collect.NullnessCasts.uncheckedCastNullableTToT;
import static java.util.Collections.unmodifiableMap;
import static java.util.Collections.unmodifiableSortedMap;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Function;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Maps.newTreeMap;
import static java.util.Collections.singletonMap;
import static java.util.Collections.unmodifiableSortedMap;

import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

                SortedMap<String, String> map = populate(new TreeMap<String, String>(), entries);
                return Collections.unmodifiableSortedMap(map);
              }
            })
        .named("unmodifiableSortedMap/TreeMap, natural")
        .withFeatures(
            MapFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.KNOWN_ORDER,
            CollectionFeature.SERIALIZABLE,

                SortedMap<String, String> map = populate(new TreeMap<String, String>(), entries);
                return Collections.unmodifiableSortedMap(map);
              }
            })
        .named("unmodifiableSortedMap/TreeMap, natural")
        .withFeatures(
            MapFeature.ALLOWS_NULL_VALUES,
            CollectionFeature.KNOWN_ORDER,
            CollectionFeature.SERIALIZABLE,