# Pastebin nvue8UTe
  'use strict';
  class Base {
    constructor(x) {
      this.x = x;
    }
  }

  let f;
  class D1 extends Base {
    constructor() {
      f = () => super(2);
    }
  }
  assertThrows(function() {
    new D1();
  }, ReferenceError);

  assertThrows(function() {
    var o = f();
    print(o.x);
  }, ReferenceError);