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(
(let config (DataSource 'config))
(let world (Configure! world config 'PureDataSource 'yt))

(let lst (AsList (Int32 '0) (Int32 '1) (Int32 '2) (Int32 '3)))
(let lst (Iterator lst))
(let lst (MapNext lst (lambda '(current next) (+ current (Int32 '1)))))
(let lst (ForwardList lst))

(let res_sink (DataSink 'result))
(let world (Write! world res_sink (Key) lst '('('type))))
(let world (Commit! world res_sink))
(return world)
)