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

(let res_sink (DataSink 'result))
(let myStruct1 (AsStruct '('a (String 'z))))
(let myStruct2 (AsStruct '('b (String 'y))))
(let flatten (FlattenMembers '('"first_" myStruct1) '('"second_" myStruct2)))
(let world (Write! world res_sink (Key) flatten '('('type))))
(let world (Write! world res_sink (Key) (Member flatten 'first_a) '('('type))))
(let add (AddMember flatten 'c (String 'x)))
(let world (Write! world res_sink (Key) add '('('type))))
(let world (Write! world res_sink (Key) (Member add 'second_b) '('('type))))
(let world (Commit! world res_sink))
(return world)
)