できた

return bind 式 という書き方ができるのか

import javafx.ui.*;
public class Tesuto2 {
  attribute x:String;
  attribute y:String;
  operation  goukei():String ;
}
operation Tesuto2.goukei():String {
    return bind "{x}と{y}.";
}
var tes = Tesuto2 {x:"山"  y: "川"};
var win = Frame {
  title: bind " JavaFX"
  width: 200  height:150
  content: GridPanel {
    rows:2 columns:1
    cells: [
    TextField {
      value: bind tes.goukei()   // *B
    },
    TextField {
      value: bind tes.x
    }
    ]
  }
  visible: true
};