In core_deftype, there's a usage of (RT/iter ...) in a syntax-quoted form https://github.com/clojure/clojure/blob/527b330045ef35b47a968d80ed3dc4999cfa2623/src/clj/clojure/core_deftype.clj#L231-L232. I can't find where clojure.lang.RT is aliased as RT, and it doesn't seem that user code gets such an alias. Is there something special I'm missing about how this works?