[racket] Maybe a silly question: Why racket don't have a constructor?

class: field element is not an optionally renamed identifier-expression pair
  at: ((x 10))
  in: (class object% (super-new) (displayln "hello world") (field ((x 10)))
(displayln x))

2012/12/20 Matthias Felleisen <matthias at ccs.neu.edu>

> (new (class object% (super-new) (displayln "hello world") (field ([x 10]))
> (displayln x)))
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