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

(let res_sink (DataSink 'result))
(let list (AsList (String 'aaa) (String 'bbb) (String 'ccc)))
(let world (Write! world res_sink (Key) (Collect (Iterator list (DependsOn (Uint32 '0)))) '()))
(let world (Write! world res_sink (Key) (Collect (Iterator (Just list))) '()))
(let world (Write! world res_sink (Key) (Collect (Iterator (Nothing (OptionalType (TypeOf list))))) '()))
(let world (Write! world res_sink (Key) (Collect (EmptyIterator (StreamType (DataType 'Double)))) '()))
(let world (Write! world res_sink (Key) (Collect (ToStream (Just (Uint32 '123)) (DependsOn (Uint32 '1)))) '()))
(let world (Write! world res_sink (Key) (Collect (ToStream (Nothing (OptionalType (DataType 'Double))))) '()))
(let world (Write! world res_sink (Key) (Collect (ToStream (EmptyIterator (StreamType (DataType 'String))))) '()))
(let world (Write! world res_sink (Key) (Collect (ToStream list (DependsOn (Uint32 '2)))) '()))
(let world (Commit! world res_sink))
(return world)
)