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in.rkt (241B)

      1 #lang racket/base
      2 
      3 (provide in)
      4 
      5 (require racket/stxparam
      6          (for-syntax racket/base))
      7 
      8 (define-syntax-parameter in
      9   (λ (stx)
     10     (raise-syntax-error
     11      'in
     12      "used out of context. It can only be used in some forms."
     13      stx)))