/usr/lib/help/set-cdrb is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 7 8 9 10 | R4RS 6.3 (set-cdr! pair object) ==> unspecific
Stores OBJECT in the cdr field of PAIR. The value returned by
SET-CDR! is unspecified.
(define (f) (list 'not-a-constant-list))
(define (g) '(constant-list))
(set-cdr! (f) 3) ==> unspecified
(set-cdr! (g) 3) ==> error
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