interface implemented in this section is awkward, since the compiler can be called only once (when the evaluator machine is started). Augment the compiler-interpreter interface by providing a
primitive that can be called from within the explicit-control evaluator as follows:
;;; EC-Eval input: (compile-and-run '(define (factorial n) (if (= n 1) 1 (* (factorial (- n 1)) n)))) ;;; EC-Eval value: ok ;;; EC-Eval input: (factorial 5) ;;; EC-Eval value: 120
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