Did you read the patent? This one only applies to web applications and many of its claims are Javascript specific (which is pretty narrow for a patent, but that's how it was written).

Erlang is great, but depending on which claims are accepted, it probably can't count as prior art here.

There's also some secret sauce in here about hot patching JS objects and annotating JS objects with information about which source files they came from.

(IANAL)