From the mailing list http://groups.google.com/group/clojure/msg/c41d909bd58e4534. It is easy to use deprecated namespaces without knowing you are doing so. The documentation warnings are small, and there is no compiler warning.
Some possibilities include:
- much more visible deprecation styling in the documentation
- stderr warnings when referencing a deprecated thing.
I don't love the idea of stderr warnings on all the time. Rich: is there an approach to this that you would like to see a patch for?