anchor.diff:  
     accept(ExpressionVisitor v) => v.visitSuperPropertyGet(this);
   
  -  visitChildren(Visitor v) {}
  +  visitChildren(Visitor v) {
  +    name?.accept(v);
  +  }
   
     transformChildren(Transformer v) {}
   }
  
positive.code:   accept(ExpressionVisitor v) => v.visitSuperPropertySet(this);
  
    visitChildren(Visitor v) {
      value?.accept(v);
    }
  
  
negative.code:   accept(ExpressionVisitor v) => v.visitSuperMethodInvocation(this);
  
    visitChildren(Visitor v) {
      name?.accept(v);
      arguments?.accept(v);
    }
  
  