test/mjsunit/call-stub.js

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function Hash() {
  for (var i = 0; i < 100; i++) {
    this['a' + i] = i;
  }

  delete this.a50;  // Ensure it's a normal object.
}

Hash.prototype.m = function() {
  return 1;
};

var h = new Hash();

for (var i = 1; i < 100; i++) {
  if (i == 50) {
    h.m = function() {
      return 2;
    };
  } else if (i == 70) {
    delete h.m;
  }
  assertEquals(i < 50 || i >= 70 ? 1 : 2, h.m());
}