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multiple return values

Hi,

Guile-GTK needs multiple return values. Does this exist already or are
there plans to implement it? How about a multi-let or multi-set like

(define (give-two)
  (list 5 7))

(multi-let (((a b) (give-two)))
  (display a) ; => 5
  (display b) ; => 7
  )

-- http://www.ping.de/sites/aibon/