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2 points by CatDancer 3209 days ago | link | parent

If b is a global variable, it's easy.

If b is a lexical variable, eval won't help, since it isn't run in the lexical scope in which it's called. An Arc lexical variable will get compiled to an MzScheme lexical variable, and I don't know of a way to refer to an MzScheme lexical variable by name determined at run time. If there isn't, I suspect your only hope might be to modify the Arc compiler to generate code like

  (case v
    ((a) (set! a n))
    ((b) (set! b n))
    ((c) (set! c n))
    ((d) (set! d n))
for all the lexical variables available at that point.