/usr/lib/s9fes/help/setb is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 | R4RS 4.1.6 (set! <variable> <expression>) ==> unspecific
<Expression> is evaluated, and the resulting value is stored in the
location to which <variable> is bound. <Variable> must be bound
either in some region enclosing the SET! expression or at top level.
The result of the SET! expression is unspecified.
(define x 2)
(+ x 1) ==> 3
(set! x 4) ==> unspecified
(+ x 1) ==> 5
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