(
#comment
(let config (DataSource 'config))

(let res_sink (DataSink 'result))
(let f1 (lambda '(x y) (block '(
    (return (+ x y))
))))

(let f2 (lambda '(x) (block '(
    (return (Apply f1 x (Uint64 '2)))
))))

(let writer (lambda '(world data) (block '(
   (let world (Write! world res_sink (Key) data '()))
   (let world (Commit! world res_sink))
   (return world)
))))

(let data1 (Apply f2 (Uint64 '3)))
(let data2 (Apply f2 (Uint64 '4)))
(let world (Apply writer world data1))
(let world (Apply writer world data2))
(return world)
)