Add root-cause to exceptions in err-info

[Malabarba]

As mentioned here. Do something like this.

[bbatsov]

Indeed. Let's hope we'll manage to squeeze this in 0.10.

[bbatsov]

You'll have to remind us what we were supposed to do here, as your fork no longer exists.

[Malabarba]

No idea. Guess we can close this for now. :-)

[bbatsov]

My guess is that err-info is discarding the root cause or something like this.

[cichli]

Possibly you're referring to the root-ex slot that regular nREPL eval returns? https://github.com/clojure/tools.nrepl/blob/master/src/main/clojure/clojure/tools/nrepl/middleware/interruptible_eval.clj#L122-L124

Because we use clojure.stacktrace/print-cause-trace, this information is (indirectly) included in the response, if you examine the cause trace. But I do think it would be nice to unify the interface of eval errors and our middleware errors.

[bbatsov]

Ah, yes. I'm pretty sure this is what I meant.

[bbatsov]

@sanjayl Maybe you'd like to tackle this task as well?

[mallt]

Would it suffice for this issue to simply add a :root-ex key to the error summary that holds the classname of the root cause?