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Paste # 40022
2018-11-06 10:30:59

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  1. #lang racket
  2. (string-append (substring (1 string-length "abcde") (string-ref "abcde" 0)))

=>

application: not a procedure;

 expected a procedure that can be applied to arguments

  given: 1

  arguments...:

   #<procedure:string-length>

   "abcde"