nashorn's engine debugging API

[Clément Fauconnier]

Dear Jim Laskey
Following the discussion started on Twitter, I would like to have more details about this API you talked about.I started doing the exactly same thing adapting JVMDI tty to my needs but it was too complicated so I change my approach before viewing how to interact with nashorn "compiled" js.
 So, I'm really interested to your example. 

Thanks in advance for your reply.
Clément Fauconnier.