I'm working on a new improvement to the saved values feature for Proto REPL. (See https://github.com/jasongilman/proto-repl/blob/master/README.md#saving-and-viewing-local-binding-values) next to all of the displayed values will be a def button. Clicking it will "def" the value meaning you can easily use it in the REPL.
It's going to make debugging problems in Clojure code a lot easier. I'm thinking about doing a YouTube video to show how it works.