test/mjsunit/compiler/property-refs.js

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function Load(o) {
  return o.outer.x | o.outer.inner.y;
}

function StoreXY(o, x, y) {
  o.outer.x = x;
  o.outer.inner.y = y;
}

function LoadXY(x, y) {
  var object = {
    outer: {
      x: 0,
      inner: { y: 0 }
    }
  };
  StoreXY(object, x, y);
  return Load(object);
}

for (var i = 0; i < 10000; i++) LoadXY(i, i);
assertEquals(42 | 87, LoadXY(42, 87));
assertEquals(42 | 87, LoadXY(42, 87));
assertEquals(42 | 99, LoadXY(42, "99"));