Using the label and block syntax for this was a stroke of genius. Two great things about this "thinking inside the box" approach are: 1. You're encouraged to

Using the label and block syntax for this was a stroke of genius. Two great things about this "thinking inside the box" approach are: 1. You're encouraged to use native APIs because they're highly unlikely to clash with the framework. 2. You can a legible stack trace. After all, the only thing the compiler does to your JavaScript is add some instrumentation here and there.