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Text File  |  1990-03-27  |  204 b   |  15 lines
  1. ;;; -*- Scheme -*-
  2.  
  3. #|
  4. Description:
  5. This code tests boolean generation in predicates.
  6.  
  7. Usage:
  8. (foo? '((1))) -> #t
  9. (foo? '(())) -> ()
  10. |#
  11.  
  12. (declare (usual-integrations))
  13.  
  14. (define (foo? x)
  15.   (pair? (car x)))