anchor.diff:  }
   
   bool _isAbstract(engine.Element element) {
  -  // TODO(scheglov) add isAbstract to Element API
     if (element is engine.ClassElement) {
       return element.isAbstract;
     }
  
positive.code: }
  
  bool _isConst(engine.Element element) {
    // TODO(scheglov) add isConst to Element API
    if (element is engine.ConstructorElement) {
      return element.isConst;
    }
  
negative.code: }
  
  bool _isStatic(engine.Element element) {
    if (element is engine.ExecutableElement) {
      return element.isStatic;
    }
  