(assert= 8 ([2 6 2 8 9] 3))
(assert= 9 ([[3 6] [9 2]] 1 0))
($ a ['a' [[2 true] 2.3]])
(assert= 'a' (a 0))
(assert= 2 (a 1 0 0))
($ (second arr)
(arr 1))
(assert= 6 (second [2 6]))
($ (produce)
[2 4 6])
(assert= 4 (second (produce)))