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