Polymer.Base.async "infinite loop" condition

[cdata]

Please consider the following contrived usage of Polymer.Base.async:

<link rel="import" href="../polymer/polymer.html">
<script>
  function AsyncAlpha() {
    // Queue a task:
    Polymer.Base.async(function() {
      console.log('alpha');

      // Cause a second task to be queued:
      AsyncBeta();

      // Throw an exception before the first task returns:
      throw new Error('ANY ERROR');
    });
  }

  function AsyncBeta() {
    Polymer.Base.async(function() {
      console.log('beta');
    });
  }

  AsyncAlpha();
</script>

The above example will cause the first task ("alpha") to be re-called in what is effectively an infinite loop. In order to reproduce this condition, a second task ("beta") must be queued before the first task returns, and an exception must be thrown after the second task is queued but before the first task returns.

[timeu]

Yes I had the same issue, when I ported a rather complicated element from 0.5 to 1.0.
A JS error caused an infinite loop when it was thrown in an async callback.

[arthurevans]

Is this a dup of #1759?

[cdata]

@arthurevans yes, it's a dupe (sorry!). I looked for potential reports of this bug, but didn't notice #1759 for some reason. Thanks for noticing this 🍻

[cdata]

On the other hand, the description of the conditions to produce the error in #1759 is incomplete according to my experience with the bug.