src/third_party/mozjs-45/js/src/jit-test/tests/gc/bug-919536.js

if ("gczeal" in this) {
  gczeal(2, 1000);

  var a = new Array(10 * 1000);

  var i = a.length;
  while (i-- != 0) {
    switch (i % 3) {
     case 0:
      a[i] = { };
      break;
    }
  }

  gc();
}