The State Machines of Core.Async

Core.async will result in a crop of new and very interesting libraries for Clojure and ClojureScript, specially for non-trivial server and client-side applications. I know a few I want to rewrite already!

Although macros are considered evil (well, evil's cousin), the fact that this library can be written justifies the presence of macros in a language. If you're not into macros, this article should change your mind.

Caveat emptor: using core.async currently results in even less useful exception traces.