anchor.diff:    external factory List.filled(int length, E fill);
   
     /**
  -   * Creates an list with the elements of [other]. The order in
  -   * the list will be the order provided by the iterator of [other].
  +   * Creates an list with the elements of [other].
  +   *
  +   * The order in the list will be
  +   * the order provided by the iterator of [other].
      *
      * The returned list is growable if [growable] is true, otherwise it's
      * a fixed length list.
  
positive.code:   }
  
    /**
     * Generate a `List` of elements.
     *
     * Generates a list of values, where the values are created by
     * calling the [generator] function for each index in the range
     * 0 .. [length] - 1.
     *
     * The created length's length is fixed unless [growable] is true.
     */
  
negative.code:    *
     * The list is a fixed-length list if [length] is provided, and an empty
     * growable list if [length] is omitted.
     *
     * It is an error if [length] is not a non-negative integer.
     */
    external factory List([int length]);
  
  