(sb-alien:load-shared-object "unwind.dll")

(sb-alien:define-alien-routine
  ("catches_fn" catches-fn)
  sb-alien:void
  (fn (* T)))

(defun sap-to-callable (ptr)
  (sb-alien:sap-alien
    (sb-alien:alien-sap ptr)
    (function sb-alien:void)))

(sb-ext:defglobal
  alien-callback
  (sb-alien:alien-sap
    (sb-alien::alien-lambda sb-alien:void ((ptr (* t)))
      (format *error-output* "Lisp callback~%")
      (unwind-protect (sb-alien:alien-funcall (sap-to-callable ptr))
        (format *error-output* "Lisp unwind")))))

(defun test-seh ()
  (catches-fn alien-callback)
  (values))

(test-seh)