text: // Parameter properties are not valid in overloads of constructors
  class C {
      constructor(x, y){
          this.x = x;
          this.y = y;
      }
  }
  class C2 {
      constructor(x1){
          this.x = x1;
      }
  }
  class C3 {
      constructor(y1){
          this.y = y1;
      }
  }
  var a;
  var b;
  