/usr/lib/s9fes/help/string-setb is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 | R4RS 6.7 (string-set! string integer char) ==> unspecific
INTEGER must be a valid index of STRING. STRING-SET! stores CHAR
in the element at the INTEGER'th position of STRING and returns an
unspecified value.
(define (f) (make-string 3 #\*))
(define (g) "***")
(string-set! (f) 0 #\?) ==> unspecified
(string-set! (g) 0 #\?) ==> error
(string-set! (symbol->string 'immutable) 0 #\?) ==> error
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