anchor.diff:  
     bool get isEven => false;
     bool get isNegative;
  +  bool get isOdd;
  +  int get sign;
   
     int operator &(int other);
     int operator -();
  
positive.code: library dart._internal;
  
  class Symbol {}
  
  class ExternalName {
    final String name;
  
negative.code:     throw 0;
    }
  }
  
  abstract class ListMixin<E> implements List<E> { }
  
  abstract class MapMixin<K, V> implements Map<K, V> { }
  
  abstract class SetMixin<E> implements Set<E> { }
  ''',
    )
  ]);
  