One more alpha4 add-libs thing: it seems to fail (with an identical error to that one I posted above) if you have *print-length* set to a number small enough to abbreviate your :deps when printing them. I think it's due to https://github.com/clojure/clojure/blob/501348deb1e49736f3c49f2c177bcff947fe3a17/src/clj/clojure/tools/deps/interop.clj#L40
If I could trouble you to put this on http://ask.clojure.org that would be very helpful
done! https://ask.clojure.org/index.php/13053/add-libs-fails-when-print-length-is-set-in-1-12-alpha4
thank you