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

(let res_sink (DataSink 'result))
(let s (AsStruct '('a (String 'ccc)) '('b (Double '3.5))))
(let world (Write! world res_sink (Key) (ReplaceMember s 'a (Int32 '7)) '('('type))))
(let world (Write! world res_sink (Key) (ReplaceMember s 'b (String 'aaa)) '('('type))))

(let world (Commit! world res_sink))
(return world)
)