anchor.diff:    final Type type;
   
     ReferenceWithType(this.reference, this.type);
  +
  +  @override
  +  String toString() => 'ReferenceWithType($reference, $type)';
   }
   
   /// Data structure representing a unique value that a variable might take on
  
positive.code:       _wrapped._dumpState();
      }
      if (isQuery) {
        print('  => $result');
      }
      return result;
    }
  }
  
  
negative.code:     }
      if (nonPromotionHistory != null) {
        parts.add('nonPromotionHistory: $nonPromotionHistory');
      }
      if (properties.isNotEmpty) {
        parts.add('properties: $properties');
      }
      return 'VariableModel(${parts.join(', ')})';
    }
  