Misses simple race involving asynchronous script loading

[christofferqa]

Actual: EventRacer does not report a race for the following simple example ifa.js loads before b.js. Expected: A race on window.status is issued.

index.html:

<output id="o">Loading</output>
<script>
window.status = 'Loading';
</script>
<script src="a.js" async></script>
<script src="b.js" async></script>

a.js:

window.status = 'Loaded';

b.js:

document.getElementById("o").value = window.status;