string-set![procedure] string-set! string k char
R5RS: k must be a valid index of string.
String-set! stores char in element k
of string and returns an unspecified value.
R6RS: In R6RS, this procedure is moved to a library
(rnrs mutable-strings (6)), which is not included
in the composite library (rnrs (6)).
See also string-ref.
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