[jwdunne]

Thank you :)

I think you were correct about Clojure. I read recently reader macros are not an available feature.

[arohner]

Yes, mostly. reader macros are not extensible by the user. The compiler has and uses reader macros.

Rich Hickey has said he hasn't seen an implementation of reader macros that is compose-able across libraries. i.e. two different OSS libs using a two different incompatible macros.