Method keySet

guava/src/com/google/common/collect/Maps.java:976–979

()

    }

    @Override
    public Set<K> keySet() {
      return removeOnlySortedSet(backingSet());
    }

    @Override
    public SortedMap<K, V> subMap(@ParametricNullness K fromKey, @ParametricNullness K toKey) {