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Simulating Coroutines in Scheme

Coroutines can be simulated in Scheme by (heavy) use of continuations

; In C1:
(let ((v ...)           ; value to C2
      (cont2 ...)       ; continuation in C2
  (let ((from-c2        ; value from C2 - received upon the next resume from C2
             (lambda (cont1)              ; captured continuation in C1
                 (cont2 (cons v cont1))   ; resume C2 - pass v and cont1