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1 2 3 4 5 6 7 8 9 10 11 12 | ; zenlisp example program
; By Nils M Holm, 1998-2007
; See the file LICENSE for conditions of use.
; Check whether an expression X is the head of an expression Y:
; (headp '(a b c) '(a b c d e f)) => 't
(define (headp x y)
(cond ((null y) (null x))
((null x) :t)
(t (and (equal (car x) (car y))
(headp (cdr x) (cdr y))))))
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