I won't be able to `exit` the repl anymore with the deprecation message that makes me stop for two or three seconds and think first, _warning_?, and second, what will I do when they take away `exit`.

I quit sbt with `bye`, so probably I will rename on import.

I can't use `:q` because I reflexively `:wq`.  I hope git markup doesn't turn :q into some sort of face.

But will `-Xlint:strict` warn me that I shouldn't use `sys.exit` in case my code winds up in a context that doesn't care to terminate the jvm just now?