;;;; A Vec of a Vec is representable and would be wrong. The runtime is
;;;; type-erased: it copies and releases elements bytewise, so `clone` would
;;;; duplicate the inner headers instead of copying what they own, and `free`
;;;; would drop their buffers on the floor. spec-memory.md makes clone a deep
;;;; copy and makes free recurse structurally into owning fields; recursive
;;;; teardown is what `drop` brings, and this is refused until it does rather
;;;; than shipping the shallow answer under the deep name.
(defn rows [xs (Vec (Vec i32))] i32 0)

(defn main [] i32 0)