src/third_party/mozjs-45/js/src/jit-test/tests/basic/testAddAnyInconvertibleObject.js

function testAddAnyInconvertibleObject()
{
  var count = 0;
  function toString() { ++count; if (count == 95) return {}; return "" + count; }
  var o = {valueOf: undefined, toString: toString};

  var threw = false;
  try
  {
    for (var i = 0; i < 100; i++)
        var q = 5 + o;
  }
  catch (e)
  {
    threw = true;
    if (i !== 94)
      return "expected i === 94, got " + i;
    if (q !== "594")
      return "expected q === '594', got " + q + " (type " + typeof q + ")";
    if (count !== 95)
      return "expected count === 95, got " + count;
  }
  if (!threw)
    return "expected throw with 5 + o"; // hey, a rhyme!

  return "pass";
}
assertEq(testAddAnyInconvertibleObject(), "pass");