/usr/lib/help/listp is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 7 8 9 10 11 | R4RS 6.3 (list? object) ==> boolean
Returns #T if OBJECT is a list, otherwise returns #F. By definition,
all lists have finite length and are terminated by the empty list.
(list? '(a b c)) ==> #t
(list? '()) ==> #t
(list? '(a . b)) ==> #f
(let ((x (list 'a)))
(set-cdr! x x)
(list? x)) ==> #f
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