Checks that stepInto nested arrow function doesn't produce crash.
paused
(anonymous) (test.js:2:0)
(anonymous) (:0:6)
paused
rec (test.js:1:19)
(anonymous) (test.js:2:0)
(anonymous) (:0:6)
paused
rec (test.js:2:5)
(anonymous) (test.js:2:0)
(anonymous) (:0:6)
paused
(anonymous) (test.js:2:5)
(anonymous) (:0:6)
paused
(anonymous) (:0:9)