[racket] racket/serialize example in The Racket Guide does not work

[fyooo]

I followed the guide in http://docs.racket-lang.org/guide/serialization.html‍


> (require racket/serialize)
> (serializable-struct posn (x y) #:transparent)
> (deserialize (serialize (posn 1 2)))
. . dynamic-require: name is not provided
  name: 'deserialize-info:posn-v0
  module: #<resolved-module-path:'anonymous-module>‍
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