I'm working on a Clojure to C transpiler (that you drive from your JVM REPL, backed by clang), and started to use Portal to debug C code, feels so nice!! \o/ It started out of the desire to make overtone (SC) plugins, but it kinda got out of control lol. In the video you can see I'm tapping (behind the scenes, the C function for tapping invokes our JVM one where the necessary work to adapt the result from C is done), you can see the generated C code and the output on the right (it contains some metadata like the form itself and the clj line/column + ns).