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when-let.rkt (198B)

      1 #lang racket/base
      2 
      3 (provide when-let)
      4 
      5 (require (for-syntax racket/base))
      6 
      7 (define-syntax-rule (when-let [variable condition] . body)
      8   (let ([variable condition])
      9     (when variable
     10       . body)))