anchor.diff:  (define keywords-2 '(define lambda set! quote
                        c-call))
   
  -(define internal-keywords '(ref call
  +(define internal-keywords '(ref call return varargs-return
                               make-box box-ref box-set!
                               check-arg-count arg-count
                               negate
  
positive.code:           (emit-indirect-call out)))
  
      (emit-restore-%func out)
      (emit-convert-value out %funcres dest new-frame-base out-frame-base)))
  
  ;;; Strings and vectors
  
  
negative.code:   (collect-closures program)
    (introduce-boxes program)
    (lambda-label program)
    ;(codegen-program program)
    (format~ true "~S~%" (debug-form program))
    )
  
  (define keywords-1
  