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once-identifier.rkt (213B)

      1 #lang racket/base
      2 (provide once)
      3 
      4 (require (for-syntax racket/base))
      5 
      6 (define-syntax once
      7   (λ (stx)
      8     (raise-syntax-error
      9      'once
     10      "The \"once\" identifier can only be used in some contexts"
     11      stx)))