#;10> (begin (define update #f) (let ([v 'foo]) (set! update (lambda
(d s) (printf "~s was ~s~%" d (eval d)) (set! d s)))))
#;11> (update 'v 'bar)
Error: unbound variable: v

What I'm trying to do is pass the name of a let-bound variable in to a
lambda defined within the let context, in order to tell that lambda to
access that let-bound variable.  eval doesn't work because it looks in
the outer environment, right?  (in which v is not bound)


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