Система бранч-4.1. При попытке войти в раздел "Альтернативы" в acc
происходит падение альтератора со следующими симптомами:

$ acc
socket path /tmp/alterator/browser-sock ...
backtrace:
In /usr/share/guile/1.6/alterator/presentation/container.scm:
 212: 42* [#<procedure #f args>]
In /usr/share/guile/1.6/alterator/object.scm:
  47: 43  (let ((proc (call-proc))) (if (procedure? proc) (apply proc args) proc))
In unknown file:
    ...
   ?: 44  (let ((url (cf current-module))) (frame:call-on-leave) ...)
   ?: 45* [frame:replace /alternatives]
   ?: 46  (let ((page #)) (and page (begin # # # ...)))
In /usr/share/guile/1.6/alterator/lookout/goto.scm:
    ...
  60: 47  [with-fluids* (#<fluid 11>) (((globals # #))) #<procedure #f ()>]
In unknown file:
   ?: 48* [#<procedure #f ()>]
In /usr/share/guile/1.6/alterator/lookout/goto.scm:
  61: 49* [clean-widget #<procedure #f args> #<procedure #f ()>]
In unknown file:
   ?: 50  (letrec (# # # ...) (simple-notify widget # ...) ...)
In /usr/share/guile/1.6/alterator/presentation/container.scm:
    ...
 212: 51  [with-fluids* (#<fluid 11>) (((globals # #))) #<procedure #f ()>]
In unknown file:
   ?: 52* [#<procedure #f ()>]
In /usr/share/guile/1.6/alterator/presentation/container.scm:
 212: 53* [#<procedure #f args>]
In /usr/share/guile/1.6/alterator/object.scm:
  47: 54  (let ((proc (call-proc))) (if (procedure? proc) (apply proc args) proc))
In unknown file:
    ...
   ?: 55  [#<procedure #f ()>]
   ?: 56  (update-constraints "write" "/alternatives")
   ?: 57* [#<procedure #f (key . args)> unbound-variable #f ...]
In /usr/share/guile/1.6/alterator/exit-handler.scm:
  21: 58* (or (eq? key #) (begin # #))
  22: 59  (begin (format #t "backtrace:~%") (display-backtrace # #))
  23: 60  [display-backtrace ...
  23: 61*  [gsubr-apply #<primitive-procedure make-stack> #t]
/usr/share/guile/1.6/alterator/exit-handler.scm:27:6: In procedure apply in expression (apply throw args):
/usr/share/guile/1.6/alterator/exit-handler.scm:27:6: Unbound variable: update-constraints

При этом через веб-интерфейс вроде нормально работает.