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set!* added by iisjmii on Thu Aug 30 00:04:30 2012

(use environments)

(define-syntax set!*
  (ir-macro-transformer
   (lambda (expr inc cmp?)
     (apply (lambda (_ name exp)
              `(if (not (environment-includes? (interaction-environment) ',name))
                   (error "Binding does not exist.")
                   (set! ,name ,exp)))
            expr))))
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