anchor.diff:    List<V> operator [](Object key) => super[key];
     List<V> removeAll(Object key) => super.removeAll(key);
     Map<K, List<V>> asMap() => new _WrappedMap<K, V, List<V>>(this);
  -  @Deprecated('Will be removed in 0.22.0')
  -  Map<K, List<V>> toMap() => asMap();
   }
   
   /**
  
positive.code:   Map<K, Iterable<V>> asMap();
  
    /**
     * Returns a view of this multimap as a map.
     *
     * DEPRECATED: this method is replaced with `asMap`.
     */
    @Deprecated('Will be removed in 0.22.0')
    Map<K, Iterable<V>> toMap();
  
    /**
     * The number of keys in the multimap.
     */
    int get length;
  
negative.code:   Set<V> operator [](Object key) => super[key];
    Set<V> removeAll(Object key) => super.removeAll(key);
    Map<K, Set<V>> asMap() => new _WrappedMap<K, V, Set<V>>(this);
  }
  
  /**
  