anchor.diff:      throw new UnsupportedError(
           "Cannot modify an unmodifiable list");
     }
  -}+}
  
positive.code:  *
   * All methods that can modify the list will throw an [UnsupportedError].
   */
  class UnmodifiableUint8List extends Object with _UnmodifiableListMixin<int> implements Uint8List {
  
    final Uint8List _underlyingUint8List;
  
  
negative.code: 
    @override
    noSuchMethod(Invocation invocation) => reflect(_underlyingUint8List).delegate(invocation);
  
    /** This operation is not supported by an unmodifiable list. */
    void operator []=(int index, E value) {
  