src/v8/test/mjsunit/es6/regress/regress-2829.js

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(function test1() {
  var wm1 = new WeakMap();
  wm1.set(Object.prototype, 23);
  assertTrue(wm1.has(Object.prototype));
  Object.freeze(Object.prototype);

  var wm2 = new WeakMap();
  var o = {};
  wm2.set(o, 42);
  assertEquals(42, wm2.get(o));
})();

(function test2() {
  var wm1 = new WeakMap();
  var o1 = {};
  wm1.set(o1, 23);
  assertTrue(wm1.has(o1));
  Object.freeze(o1);

  var wm2 = new WeakMap();
  var o2 = Object.create(o1);
  wm2.set(o2, 42);
  assertEquals(42, wm2.get(o2));
})();