The following code does not compile on guile-2.9:

--------------------------------------------
(define-module (r)
  #:use-module (ice-9 control)
  #:export ())

(define ramanujan
  (lambda ()
  (let/ec break-ret
    (let lp ()
      (break-ret)
      (lp)))))
----------------------------------------------

The error report
;; WARNING: compilation of /home/stis/src/python-on-guile/modules/langua
ge/python/module/r.scm failed:
;;; not found 37

Regards
Stefan