I did not see a link for the code.
http://framegen.wordpress.com/2010/06/17/open-sourcing-gwt-c...
I should have known. The post said "lightweight version of Clojure". It's not a lightweight version of Clojure, it's a partial implementation of Clojure. It's an important distinction.
I learned yesterday that a closure is a function that's saved in a variable with out being effected by the context its run in, just the context it was saved in.